Merged origin/master into pubsub_cleanup

25 files changed, 826 insertions, 476 deletions

diff --git a/src/modules/commander/commander.cpp b/src/modules/commander/commander.cpp
index add7312de..54219a34a 100644
--- a/src/modules/commander/commander.cpp
+++ b/src/modules/commander/commander.cpp
@@ -154,6 +154,16 @@ static bool on_usb_power = false;
 
 static float takeoff_alt = 5.0f;
 
+static struct vehicle_status_s status;
+
+/* armed topic */
+static struct actuator_armed_s armed;
+
+static struct safety_s safety;
+
+/* flags for control apps */
+struct vehicle_control_mode_s control_mode;
+
 /* tasks waiting for low prio thread */
 typedef enum {
 	LOW_PRIO_TASK_NONE = 0,
@@ -204,12 +214,15 @@ void check_mode_switches(struct manual_control_setpoint_s *sp_man, struct vehicl
 
 transition_result_t check_main_state_machine(struct vehicle_status_s *current_status);
 
-void print_reject_mode(const char *msg);
+void print_reject_mode(struct vehicle_status_s *current_status, const char *msg);
 
 void print_reject_arm(const char *msg);
 
 void print_status();
 
+int arm();
+int disarm();
+
 transition_result_t check_navigation_state_machine(struct vehicle_status_s *status, struct vehicle_control_mode_s *control_mode, struct vehicle_local_position_s *local_pos);
 
 /**
@@ -277,6 +290,16 @@ int commander_main(int argc, char *argv[])
 		exit(0);
 	}
 
+	if (!strcmp(argv[1], "arm")) {
+		arm();
+		exit(0);
+	}
+
+	if (!strcmp(argv[1], "disarm")) {
+		disarm();
+		exit(0);
+	}
+
 	usage("unrecognized command");
 	exit(1);
 }
@@ -344,6 +367,30 @@ void print_status()
 static orb_advert_t control_mode_pub;
 static orb_advert_t status_pub;
 
+int arm()
+{
+	int arming_res = arming_state_transition(&status, &safety, &control_mode, ARMING_STATE_ARMED, &armed);
+
+	if (arming_res == TRANSITION_CHANGED) {
+		mavlink_log_info(mavlink_fd, "[cmd] ARMED by commandline");
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+int disarm()
+{
+	int arming_res = arming_state_transition(&status, &safety, &control_mode, ARMING_STATE_STANDBY, &armed);
+
+	if (arming_res == TRANSITION_CHANGED) {
+		mavlink_log_info(mavlink_fd, "[cmd] ARMED by commandline");
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
 void handle_command(struct vehicle_status_s *status, const struct safety_s *safety, struct vehicle_control_mode_s *control_mode, struct vehicle_command_s *cmd, struct actuator_armed_s *armed)
 {
 	/* result of the command */
@@ -537,16 +584,6 @@ void handle_command(struct vehicle_status_s *status, const struct safety_s *safe
 
 }
 
-static struct vehicle_status_s status;
-
-/* armed topic */
-static struct actuator_armed_s armed;
-
-static struct safety_s safety;
-
-/* flags for control apps */
-struct vehicle_control_mode_s control_mode;
-
 int commander_thread_main(int argc, char *argv[])
 {
 	/* not yet initialized */
@@ -583,6 +620,8 @@ int commander_thread_main(int argc, char *argv[])
 	/* make sure we are in preflight state */
 	memset(&status, 0, sizeof(status));
 	status.condition_landed = true;	// initialize to safe value
+	// We want to accept RC inputs as default
+	status.rc_input_blocked = false;
 
 	/* armed topic */
 	orb_advert_t armed_pub;
@@ -1039,7 +1078,7 @@ int commander_thread_main(int argc, char *argv[])
 		}
 
 		/* ignore RC signals if in offboard control mode */
-		if (!status.offboard_control_signal_found_once && sp_man.timestamp != 0) {
+		if (!status.offboard_control_signal_found_once && sp_man.timestamp != 0 && !status.rc_input_blocked) {
 			/* start RC input check */
 			if (hrt_absolute_time() < sp_man.timestamp + RC_TIMEOUT) {
 				/* handle the case where RC signal was regained */
@@ -1366,7 +1405,7 @@ check_mode_switches(struct manual_control_setpoint_s *sp_man, struct vehicle_sta
 {
 	/* main mode switch */
 	if (!isfinite(sp_man->mode_switch)) {
-		warnx("mode sw not finite");
+		/* default to manual if signal is invalid */
 		current_status->mode_switch = MODE_SWITCH_MANUAL;
 
 	} else if (sp_man->mode_switch > STICK_ON_OFF_LIMIT) {
@@ -1433,7 +1472,7 @@ check_main_state_machine(struct vehicle_status_s *current_status)
 				break;	// changed successfully or already in this state
 
 			// else fallback to SEATBELT
-			print_reject_mode("EASY");
+			print_reject_mode(current_status, "EASY");
 		}
 
 		res = main_state_transition(current_status, MAIN_STATE_SEATBELT);
@@ -1442,7 +1481,7 @@ check_main_state_machine(struct vehicle_status_s *current_status)
 			break;	// changed successfully or already in this mode
 
 		if (current_status->assisted_switch != ASSISTED_SWITCH_EASY)	// don't print both messages
-			print_reject_mode("SEATBELT");
+			print_reject_mode(current_status, "SEATBELT");
 
 		// else fallback to MANUAL
 		res = main_state_transition(current_status, MAIN_STATE_MANUAL);
@@ -1456,7 +1495,7 @@ check_main_state_machine(struct vehicle_status_s *current_status)
 			break;	// changed successfully or already in this state
 
 		// else fallback to SEATBELT (EASY likely will not work too)
-		print_reject_mode("AUTO");
+		print_reject_mode(current_status, "AUTO");
 		res = main_state_transition(current_status, MAIN_STATE_SEATBELT);
 
 		if (res != TRANSITION_DENIED)
@@ -1475,16 +1514,25 @@ check_main_state_machine(struct vehicle_status_s *current_status)
 }
 
 void
-print_reject_mode(const char *msg)
+print_reject_mode(struct vehicle_status_s *current_status, const char *msg)
 {
 	hrt_abstime t = hrt_absolute_time();
 
 	if (t - last_print_mode_reject_time > PRINT_MODE_REJECT_INTERVAL) {
 		last_print_mode_reject_time = t;
 		char s[80];
-		sprintf(s, "#audio: warning: reject %s", msg);
+		sprintf(s, "#audio: REJECT %s", msg);
 		mavlink_log_critical(mavlink_fd, s);
-		tune_negative();
+
+		// only buzz if armed, because else we're driving people nuts indoors
+		// they really need to look at the leds as well.
+		if (current_status->arming_state == ARMING_STATE_ARMED) {
+			tune_negative();
+		} else {
+
+			// Always show the led indication
+			led_negative();
+		}
 	}
 }
 
@@ -1758,7 +1806,15 @@ void *commander_low_prio_loop(void *arg)
 				} else if ((int)(cmd.param4) == 1) {
 					/* RC calibration */
 					answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED);
-					calib_ret = do_rc_calibration(mavlink_fd);
+					/* disable RC control input completely */
+					status.rc_input_blocked = true;
+					calib_ret = OK;
+					mavlink_log_info(mavlink_fd, "CAL: Disabling RC IN");
+
+				} else if ((int)(cmd.param4) == 2) {
+					/* RC trim calibration */
+					answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED);
+					calib_ret = do_trim_calibration(mavlink_fd);
 
 				} else if ((int)(cmd.param5) == 1) {
 					/* accelerometer calibration */
@@ -1769,6 +1825,18 @@ void *commander_low_prio_loop(void *arg)
 					/* airspeed calibration */
 					answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED);
 					calib_ret = do_airspeed_calibration(mavlink_fd);
+				} else if ((int)(cmd.param4) == 0) {
+					/* RC calibration ended - have we been in one worth confirming? */
+					if (status.rc_input_blocked) {
+						answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED);
+						/* enable RC control input */
+						status.rc_input_blocked = false;
+						mavlink_log_info(mavlink_fd, "CAL: Re-enabling RC IN");
+					}
+
+					/* this always succeeds */
+					calib_ret = OK;
+
 				}
 
 				if (calib_ret == OK)
@@ -1827,6 +1895,10 @@ void *commander_low_prio_loop(void *arg)
 				break;
 			}
 
+		case VEHICLE_CMD_START_RX_PAIR:
+		/* handled in the IO driver */
+		break;
+
 		default:
 			answer_command(cmd, VEHICLE_CMD_RESULT_UNSUPPORTED);
 			break;
diff --git a/src/modules/commander/commander_helper.cpp b/src/modules/commander/commander_helper.cpp
index 21a1c4c2c..033e7dc88 100644
--- a/src/modules/commander/commander_helper.cpp
+++ b/src/modules/commander/commander_helper.cpp
@@ -124,10 +124,15 @@ void tune_neutral()
 
 void tune_negative()
 {
+	led_negative();
+	ioctl(buzzer, TONE_SET_ALARM, TONE_NOTIFY_NEGATIVE_TUNE);
+}
+
+void led_negative()
+{
 	blink_msg_end = hrt_absolute_time() + BLINK_MSG_TIME;
 	rgbled_set_color(RGBLED_COLOR_RED);
 	rgbled_set_mode(RGBLED_MODE_BLINK_FAST);
-	ioctl(buzzer, TONE_SET_ALARM, TONE_NOTIFY_NEGATIVE_TUNE);
 }
 
 int tune_arm()
diff --git a/src/modules/commander/commander_helper.h b/src/modules/commander/commander_helper.h
index d0393f45a..af25a5e97 100644
--- a/src/modules/commander/commander_helper.h
+++ b/src/modules/commander/commander_helper.h
@@ -62,6 +62,9 @@ int tune_arm(void);
 int tune_low_bat(void);
 int tune_critical_bat(void);
 void tune_stop(void);
+
+void led_negative();
+
 int blink_msg_state();
 
 int led_init(void);
diff --git a/src/modules/commander/rc_calibration.cpp b/src/modules/commander/rc_calibration.cpp
index 90ede499a..41f3ca0aa 100644
--- a/src/modules/commander/rc_calibration.cpp
+++ b/src/modules/commander/rc_calibration.cpp
@@ -53,17 +53,16 @@
 #endif
 static const int ERROR = -1;
 
-int do_rc_calibration(int mavlink_fd)
+int do_trim_calibration(int mavlink_fd)
 {
-	mavlink_log_info(mavlink_fd, "trim calibration starting");
-
 	int sub_man = orb_subscribe(ORB_ID(manual_control_setpoint));
+	usleep(200000);
 	struct manual_control_setpoint_s sp;
 	bool changed;
 	orb_check(sub_man, &changed);
 
 	if (!changed) {
-		mavlink_log_critical(mavlink_fd, "no manual control, aborting");
+		mavlink_log_critical(mavlink_fd, "no inputs, aborting");
 		return ERROR;
 	}
 
@@ -82,12 +81,12 @@ int do_rc_calibration(int mavlink_fd)
 	int save_ret = param_save_default();
 
 	if (save_ret != 0) {
-		mavlink_log_critical(mavlink_fd, "TRIM CAL: WARN: auto-save of params failed");
+		mavlink_log_critical(mavlink_fd, "TRIM: SAVE FAIL");
 		close(sub_man);
 		return ERROR;
 	}
 
-	mavlink_log_info(mavlink_fd, "trim calibration done");
+	mavlink_log_info(mavlink_fd, "trim cal done");
 	close(sub_man);
 	return OK;
 }
diff --git a/src/modules/commander/rc_calibration.h b/src/modules/commander/rc_calibration.h
index 9aa6faafa..45efedf55 100644
--- a/src/modules/commander/rc_calibration.h
+++ b/src/modules/commander/rc_calibration.h
@@ -41,6 +41,6 @@
 
 #include <stdint.h>
 
-int do_rc_calibration(int mavlink_fd);
+int do_trim_calibration(int mavlink_fd);
 
 #endif /* RC_CALIBRATION_H_ */
diff --git a/src/modules/mavlink/orb_listener.c b/src/modules/mavlink/orb_listener.c
index 92b1b45be..e1dabfd21 100644
--- a/src/modules/mavlink/orb_listener.c
+++ b/src/modules/mavlink/orb_listener.c
@@ -352,10 +352,10 @@ l_input_rc(const struct listener *l)
 
 		const unsigned port_width = 8;
 
-		for (unsigned i = 0; (i * port_width) < (rc_raw.channel_count + port_width); i++) {
+		for (unsigned i = 0; (i * port_width) < rc_raw.channel_count; i++) {
 			/* Channels are sent in MAVLink main loop at a fixed interval */
 			mavlink_msg_rc_channels_raw_send(chan,
-							 rc_raw.timestamp / 1000,
+							 rc_raw.timestamp_publication / 1000,
 							 i,
 							 (rc_raw.channel_count > (i * port_width) + 0) ? rc_raw.values[(i * port_width) + 0] : UINT16_MAX,
 							 (rc_raw.channel_count > (i * port_width) + 1) ? rc_raw.values[(i * port_width) + 1] : UINT16_MAX,
diff --git a/src/modules/px4iofirmware/adc.c b/src/modules/px4iofirmware/adc.c
index 81566eb2a..2f5908ac5 100644
--- a/src/modules/px4iofirmware/adc.c
+++ b/src/modules/px4iofirmware/adc.c
@@ -83,6 +83,14 @@ adc_init(void)
 {
 	adc_perf = perf_alloc(PC_ELAPSED, "adc");
 
+	/* put the ADC into power-down mode */
+	rCR2 &= ~ADC_CR2_ADON;
+	up_udelay(10);
+
+	/* bring the ADC out of power-down mode */
+	rCR2 |= ADC_CR2_ADON;
+	up_udelay(10);
+
 	/* do calibration if supported */
 #ifdef ADC_CR2_CAL
 	rCR2 |= ADC_CR2_RSTCAL;
@@ -96,41 +104,25 @@ adc_init(void)
 
 	if (rCR2 & ADC_CR2_CAL)
 		return -1;
-
 #endif
 
-	/* arbitrarily configure all channels for 55 cycle sample time */
-	rSMPR1 = 0b00000011011011011011011011011011;
+	/*
+	 * Configure sampling time.
+	 * 
+	 * For electrical protection reasons, we want to be able to have
+	 * 10K in series with ADC inputs that leave the board. At 12MHz this
+	 * means we need 28.5 cycles of sampling time (per table 43 in the
+	 * datasheet).
+	 */
+	rSMPR1 = 0b00000000011011011011011011011011;
 	rSMPR2 = 0b00011011011011011011011011011011;
 
-	/* XXX for F2/4, might want to select 12-bit mode? */
-	rCR1 = 0;
-
-	/* enable the temperature sensor / Vrefint channel if supported*/
-	rCR2 =
-#ifdef ADC_CR2_TSVREFE
-		/* enable the temperature sensor in CR2 */
-		ADC_CR2_TSVREFE |
-#endif
-		0;
-
-#ifdef ADC_CCR_TSVREFE
-	/* enable temperature sensor in CCR */
-	rCCR = ADC_CCR_TSVREFE;
-#endif
+	rCR2 |=	ADC_CR2_TSVREFE;		/* enable the temperature sensor / Vrefint channel */
 
 	/* configure for a single-channel sequence */
 	rSQR1 = 0;
 	rSQR2 = 0;
-	rSQR3 = 0;	/* will be updated with the channel each tick */
-
-	/* power-cycle the ADC and turn it on */
-	rCR2 &= ~ADC_CR2_ADON;
-	up_udelay(10);
-	rCR2 |= ADC_CR2_ADON;
-	up_udelay(10);
-	rCR2 |= ADC_CR2_ADON;
-	up_udelay(10);
+	rSQR3 = 0;	/* will be updated with the channel at conversion time */
 
 	return 0;
 }
@@ -141,11 +133,12 @@ adc_init(void)
 uint16_t
 adc_measure(unsigned channel)
 {
+
 	perf_begin(adc_perf);
 
 	/* clear any previous EOC */
-	if (rSR & ADC_SR_EOC)
-		rSR &= ~ADC_SR_EOC;
+	rSR = 0;
+	(void)rDR;
 
 	/* run a single conversion right now - should take about 60 cycles (a few microseconds) max */
 	rSQR3 = channel;
@@ -158,7 +151,6 @@ adc_measure(unsigned channel)
 
 		/* never spin forever - this will give a bogus result though */
 		if (hrt_elapsed_time(&now) > 100) {
-			debug("adc timeout");
 			perf_end(adc_perf);
 			return 0xffff;
 		}
@@ -166,6 +158,7 @@ adc_measure(unsigned channel)
 
 	/* read the result and clear EOC */
 	uint16_t result = rDR;
+	rSR = 0;
 
 	perf_end(adc_perf);
 	return result;
diff --git a/src/modules/px4iofirmware/controls.c b/src/modules/px4iofirmware/controls.c
index 541eed0e1..941500f0d 100644
--- a/src/modules/px4iofirmware/controls.c
+++ b/src/modules/px4iofirmware/controls.c
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -59,6 +59,11 @@ static perf_counter_t c_gather_ppm;
 void
 controls_init(void)
 {
+	/* no channels */
+	r_raw_rc_count = 0;
+	system_state.rc_channels_timestamp_received = 0;
+	system_state.rc_channels_timestamp_valid = 0;
+
 	/* DSM input (USART1) */
 	dsm_init("/dev/ttyS0");
 
@@ -97,26 +102,64 @@ controls_tick() {
 	/* receive signal strenght indicator (RSSI). 0 = no connection, 255: perfect connection */
 	uint16_t rssi = 0;
 
+#ifdef ADC_RSSI
+	if (r_setup_features & PX4IO_P_SETUP_FEATURES_ADC_RSSI) {
+		unsigned counts = adc_measure(ADC_RSSI);
+		if (counts != 0xffff) {
+			/* use 1:1 scaling on 3.3V ADC input */
+			unsigned mV = counts * 3300 / 4096;
+
+			/* scale to 0..253 */
+			rssi = mV / 13;
+		}
+	}
+#endif
+
 	perf_begin(c_gather_dsm);
 	uint16_t temp_count = r_raw_rc_count;
 	bool dsm_updated = dsm_input(r_raw_rc_values, &temp_count);
 	if (dsm_updated) {
-		r_status_flags |= PX4IO_P_STATUS_FLAGS_RC_DSM;
+		r_raw_rc_flags |= PX4IO_P_STATUS_FLAGS_RC_DSM;
 		r_raw_rc_count = temp_count & 0x7fff;
 		if (temp_count & 0x8000)
-			r_status_flags |= PX4IO_P_STATUS_FLAGS_RC_DSM11;
+			r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_RC_DSM11;
 		else
-			r_status_flags &= ~PX4IO_P_STATUS_FLAGS_RC_DSM11;
+			r_raw_rc_flags &= ~PX4IO_P_RAW_RC_FLAGS_RC_DSM11;
+
+		r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_FRAME_DROP);
+		r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_FAILSAFE);
 
-		rssi = 255;
 	}
 	perf_end(c_gather_dsm);
 
 	perf_begin(c_gather_sbus);
-	bool sbus_updated = sbus_input(r_raw_rc_values, &r_raw_rc_count, &rssi, PX4IO_RC_INPUT_CHANNELS);
+
+	bool sbus_status = (r_status_flags & PX4IO_P_STATUS_FLAGS_RC_SBUS);
+
+	bool sbus_failsafe, sbus_frame_drop;
+	bool sbus_updated = sbus_input(r_raw_rc_values, &r_raw_rc_count, &sbus_failsafe, &sbus_frame_drop, PX4IO_RC_INPUT_CHANNELS);
+
 	if (sbus_updated) {
 		r_status_flags |= PX4IO_P_STATUS_FLAGS_RC_SBUS;
+
+		rssi = 255;
+
+		if (sbus_frame_drop) {
+			r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_FRAME_DROP;
+			rssi = 100;
+		} else {
+			r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_FRAME_DROP);
+		}
+
+		if (sbus_failsafe) {
+			r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_FAILSAFE;
+			rssi = 0;
+		} else {
+			r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_FAILSAFE);
+		}
+
 	}
+
 	perf_end(c_gather_sbus);
 
 	/*
@@ -125,13 +168,12 @@ controls_tick() {
 	 * disable the PPM decoder completely if we have S.bus signal.
 	 */
 	perf_begin(c_gather_ppm);
-	bool ppm_updated = ppm_input(r_raw_rc_values, &r_raw_rc_count, &r_page_status[PX4IO_P_STATUS_RC_DATA]);
+	bool ppm_updated = ppm_input(r_raw_rc_values, &r_raw_rc_count, &r_page_raw_rc_input[PX4IO_P_RAW_RC_DATA]);
 	if (ppm_updated) {
 
-		/* XXX sample RSSI properly here */
-		rssi = 255;
-
 		r_status_flags |= PX4IO_P_STATUS_FLAGS_RC_PPM;
+		r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_FRAME_DROP);
+		r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_FAILSAFE);
 	}
 	perf_end(c_gather_ppm);
 
@@ -139,6 +181,9 @@ controls_tick() {
 	if (r_raw_rc_count > PX4IO_RC_INPUT_CHANNELS)
 		r_raw_rc_count = PX4IO_RC_INPUT_CHANNELS;
 
+	/* store RSSI */
+	r_page_raw_rc_input[PX4IO_P_RAW_RC_NRSSI] = rssi;
+
 	/*
 	 * In some cases we may have received a frame, but input has still
 	 * been lost.
@@ -150,97 +195,100 @@ controls_tick() {
 	 */
 	if (dsm_updated || sbus_updated || ppm_updated) {
 
-		/* update RC-received timestamp */
-		system_state.rc_channels_timestamp = hrt_absolute_time();
-
 		/* record a bitmask of channels assigned */
 		unsigned assigned_channels = 0;
 
-		/* map raw inputs to mapped inputs */
-		/* XXX mapping should be atomic relative to protocol */
-		for (unsigned i = 0; i < r_raw_rc_count; i++) {
-
-			/* map the input channel */
-			uint16_t *conf = &r_page_rc_input_config[i * PX4IO_P_RC_CONFIG_STRIDE];
-
-			if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_ENABLED) {
-
-				uint16_t raw = r_raw_rc_values[i];
-
-				int16_t scaled;
-
-				/*
-				 * 1) Constrain to min/max values, as later processing depends on bounds.
-				 */
-				if (raw < conf[PX4IO_P_RC_CONFIG_MIN])
-					raw = conf[PX4IO_P_RC_CONFIG_MIN];
-				if (raw > conf[PX4IO_P_RC_CONFIG_MAX])
-					raw = conf[PX4IO_P_RC_CONFIG_MAX];
-
-				/*
-				 * 2) Scale around the mid point differently for lower and upper range.
-				 *
-				 * This is necessary as they don't share the same endpoints and slope.
-				 *
-				 * First normalize to 0..1 range with correct sign (below or above center),
-				 * then scale to 20000 range (if center is an actual center, -10000..10000,
-				 * if parameters only support half range, scale to 10000 range, e.g. if
-				 * center == min 0..10000, if center == max -10000..0).
-				 *
-				 * As the min and max bounds were enforced in step 1), division by zero
-				 * cannot occur, as for the case of center == min or center == max the if
-				 * statement is mutually exclusive with the arithmetic NaN case.
-				 *
-				 * DO NOT REMOVE OR ALTER STEP 1!
-				 */
-				if (raw > (conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
-					scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_MAX] - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]));
-
-				} else if (raw < (conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
-					scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE] - conf[PX4IO_P_RC_CONFIG_MIN]));
-
-				} else {
-					/* in the configured dead zone, output zero */
-					scaled = 0;
-				}
-
-				/* invert channel if requested */
-				if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_REVERSE)
-					scaled = -scaled;
+		/* update RC-received timestamp */
+		system_state.rc_channels_timestamp_received = hrt_absolute_time();
+
+		/* do not command anything in failsafe, kick in the RC loss counter */
+		if (!(r_raw_rc_flags & PX4IO_P_RAW_RC_FLAGS_FAILSAFE)) {
+
+			/* update RC-received timestamp */
+			system_state.rc_channels_timestamp_valid = system_state.rc_channels_timestamp_received;
+
+			/* map raw inputs to mapped inputs */
+			/* XXX mapping should be atomic relative to protocol */
+			for (unsigned i = 0; i < r_raw_rc_count; i++) {
+
+				/* map the input channel */
+				uint16_t *conf = &r_page_rc_input_config[i * PX4IO_P_RC_CONFIG_STRIDE];
+
+				if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_ENABLED) {
+
+					uint16_t raw = r_raw_rc_values[i];
+
+					int16_t scaled;
+
+					/*
+					 * 1) Constrain to min/max values, as later processing depends on bounds.
+					 */
+					if (raw < conf[PX4IO_P_RC_CONFIG_MIN])
+						raw = conf[PX4IO_P_RC_CONFIG_MIN];
+					if (raw > conf[PX4IO_P_RC_CONFIG_MAX])
+						raw = conf[PX4IO_P_RC_CONFIG_MAX];
+
+					/*
+					 * 2) Scale around the mid point differently for lower and upper range.
+					 *
+					 * This is necessary as they don't share the same endpoints and slope.
+					 *
+					 * First normalize to 0..1 range with correct sign (below or above center),
+					 * then scale to 20000 range (if center is an actual center, -10000..10000,
+					 * if parameters only support half range, scale to 10000 range, e.g. if
+					 * center == min 0..10000, if center == max -10000..0).
+					 *
+					 * As the min and max bounds were enforced in step 1), division by zero
+					 * cannot occur, as for the case of center == min or center == max the if
+					 * statement is mutually exclusive with the arithmetic NaN case.
+					 *
+					 * DO NOT REMOVE OR ALTER STEP 1!
+					 */
+					if (raw > (conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
+						scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_MAX] - conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE]));
+
+					} else if (raw < (conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE])) {
+						scaled = 10000.0f * ((raw - conf[PX4IO_P_RC_CONFIG_CENTER] + conf[PX4IO_P_RC_CONFIG_DEADZONE]) / (float)(conf[PX4IO_P_RC_CONFIG_CENTER] - conf[PX4IO_P_RC_CONFIG_DEADZONE] - conf[PX4IO_P_RC_CONFIG_MIN]));
+
+					} else {
+						/* in the configured dead zone, output zero */
+						scaled = 0;
+					}
+
+					/* invert channel if requested */
+					if (conf[PX4IO_P_RC_CONFIG_OPTIONS] & PX4IO_P_RC_CONFIG_OPTIONS_REVERSE)
+						scaled = -scaled;
 
-				/* and update the scaled/mapped version */
-				unsigned mapped = conf[PX4IO_P_RC_CONFIG_ASSIGNMENT];
-				if (mapped < PX4IO_CONTROL_CHANNELS) {
+					/* and update the scaled/mapped version */
+					unsigned mapped = conf[PX4IO_P_RC_CONFIG_ASSIGNMENT];
+					if (mapped < PX4IO_CONTROL_CHANNELS) {
 
-					/* invert channel if pitch - pulling the lever down means pitching up by convention */
-					if (mapped == 1) /* roll, pitch, yaw, throttle, override is the standard order */
-						scaled = -scaled;
+						/* invert channel if pitch - pulling the lever down means pitching up by convention */
+						if (mapped == 1) /* roll, pitch, yaw, throttle, override is the standard order */
+							scaled = -scaled;
 
-					r_rc_values[mapped] = SIGNED_TO_REG(scaled);
-					assigned_channels |= (1 << mapped);
+						r_rc_values[mapped] = SIGNED_TO_REG(scaled);
+						assigned_channels |= (1 << mapped);
 
+					}
 				}
 			}
-		}
 
-		/* set un-assigned controls to zero */
-		for (unsigned i = 0; i < PX4IO_CONTROL_CHANNELS; i++) {
-			if (!(assigned_channels & (1 << i)))
-				r_rc_values[i] = 0;
-		}
+			/* set un-assigned controls to zero */
+			for (unsigned i = 0; i < PX4IO_CONTROL_CHANNELS; i++) {
+				if (!(assigned_channels & (1 << i)))
+					r_rc_values[i] = 0;
+			}
 
-		/*
-		 * If we got an update with zero channels, treat it as 
-		 * a loss of input.
-		 *
-		 * This might happen if a protocol-based receiver returns an update
-		 * that contains no channels that we have mapped.
-		 */
-		if (assigned_channels == 0 || rssi == 0) {
-			rc_input_lost = true;
-		} else {
-			/* set RC OK flag */
+			/* set RC OK flag, as we got an update */
 			r_status_flags |= PX4IO_P_STATUS_FLAGS_RC_OK;
+
+			/* if we have enough channels (5) to control the vehicle, the mapping is ok */
+			if (assigned_channels > 4) {
+				r_raw_rc_flags |= PX4IO_P_RAW_RC_FLAGS_MAPPING_OK;
+			} else {
+				r_raw_rc_flags &= ~(PX4IO_P_RAW_RC_FLAGS_MAPPING_OK);
+			}
 		}
 
 		/*
@@ -253,7 +301,7 @@ controls_tick() {
 	 * If we haven't seen any new control data in 200ms, assume we
 	 * have lost input.
 	 */
-	if (hrt_elapsed_time(&system_state.rc_channels_timestamp) > 200000) {
+	if (hrt_elapsed_time(&system_state.rc_channels_timestamp_received) > 200000) {
 		rc_input_lost = true;
 
 		/* clear the input-kind flags here */
@@ -261,24 +309,32 @@ controls_tick() {
 			PX4IO_P_STATUS_FLAGS_RC_PPM |
 			PX4IO_P_STATUS_FLAGS_RC_DSM |
 			PX4IO_P_STATUS_FLAGS_RC_SBUS);
+
 	}
 
 	/*
 	 * Handle losing RC input
 	 */
-	if (rc_input_lost) {
 
+	/* this kicks in if the receiver is gone or the system went to failsafe */
+	if (rc_input_lost || (r_raw_rc_flags & PX4IO_P_RAW_RC_FLAGS_FAILSAFE)) {
 		/* Clear the RC input status flag, clear manual override flag */
 		r_status_flags &= ~(
 			PX4IO_P_STATUS_FLAGS_OVERRIDE |
 			PX4IO_P_STATUS_FLAGS_RC_OK);
 
+		/* Mark all channels as invalid, as we just lost the RX */
+		r_rc_valid = 0;
+
 		/* Set the RC_LOST alarm */
 		r_status_alarms |= PX4IO_P_STATUS_ALARMS_RC_LOST;
+	}
 
-		/* Mark the arrays as empty */
+	/* this kicks in if the receiver is completely gone */
+	if (rc_input_lost) {
+
+		/* Set channel count to zero */
 		r_raw_rc_count = 0;
-		r_rc_valid = 0;
 	}
 
 	/*
diff --git a/src/modules/px4iofirmware/mixer.cpp b/src/modules/px4iofirmware/mixer.cpp
index e55ef784a..f39fcf7ec 100644
--- a/src/modules/px4iofirmware/mixer.cpp
+++ b/src/modules/px4iofirmware/mixer.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -71,6 +71,7 @@ extern "C" {
 static bool mixer_servos_armed = false;
 static bool should_arm = false;
 static bool should_always_enable_pwm = false;
+static volatile bool in_mixer = false;
 
 /* selected control values and count for mixing */
 enum mixer_source {
@@ -95,6 +96,7 @@ static void mixer_set_failsafe();
 void
 mixer_tick(void)
 {
+
 	/* check that we are receiving fresh data from the FMU */
 	if (hrt_elapsed_time(&system_state.fmu_data_received_time) > FMU_INPUT_DROP_LIMIT_US) {
 
@@ -199,13 +201,17 @@ mixer_tick(void)
 		}
 
 
-	} else if (source != MIX_NONE) {
+	} else if (source != MIX_NONE && (r_status_flags & PX4IO_P_STATUS_FLAGS_MIXER_OK)) {
 
 		float	outputs[PX4IO_SERVO_COUNT];
 		unsigned mixed;
 
 		/* mix */
+
+		/* poor mans mutex */
+		in_mixer = true;
 		mixed = mixer_group.mix(&outputs[0], PX4IO_SERVO_COUNT);
+		in_mixer = false;
 
 		pwm_limit_calc(should_arm, mixed, r_page_servo_disarmed, r_page_servo_control_min, r_page_servo_control_max, outputs, r_page_servos, &pwm_limit);
 
@@ -217,14 +223,25 @@ mixer_tick(void)
 		}
 	}
 
-	if ((should_arm || should_always_enable_pwm) && !mixer_servos_armed) {
+	/* set arming */
+	bool needs_to_arm = (should_arm || should_always_enable_pwm);
+
+	/* check any conditions that prevent arming */
+	if (r_setup_arming & PX4IO_P_SETUP_ARMING_LOCKDOWN) {
+		needs_to_arm = false;
+	}
+	if (!should_arm && !should_always_enable_pwm) {
+		needs_to_arm = false;
+	}
+
+	if (needs_to_arm && !mixer_servos_armed) {
 		/* need to arm, but not armed */
 		up_pwm_servo_arm(true);
 		mixer_servos_armed = true;
 		r_status_flags |= PX4IO_P_STATUS_FLAGS_OUTPUTS_ARMED;
 		isr_debug(5, "> PWM enabled");
 
-	} else if ((!should_arm && !should_always_enable_pwm) && mixer_servos_armed) {
+	} else if (!needs_to_arm && mixer_servos_armed) {
 		/* armed but need to disarm */
 		up_pwm_servo_arm(false);
 		mixer_servos_armed = false;
@@ -297,12 +314,17 @@ mixer_callback(uintptr_t handle,
 static char mixer_text[256];		/* large enough for one mixer */
 static unsigned mixer_text_length = 0;
 
-void
+int
 mixer_handle_text(const void *buffer, size_t length)
 {
 	/* do not allow a mixer change while safety off */
 	if ((r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF)) {
-		return;
+		return 1;
+	}
+
+	/* abort if we're in the mixer */
+	if (in_mixer) {
+		return 1;
 	}
 
 	px4io_mixdata	*msg = (px4io_mixdata *)buffer;
@@ -310,7 +332,7 @@ mixer_handle_text(const void *buffer, size_t length)
 	isr_debug(2, "mix txt %u", length);
 
 	if (length < sizeof(px4io_mixdata))
-		return;
+		return 0;
 
 	unsigned	text_length = length - sizeof(px4io_mixdata);
 
@@ -328,13 +350,16 @@ mixer_handle_text(const void *buffer, size_t length)
 	case F2I_MIXER_ACTION_APPEND:
 		isr_debug(2, "append %d", length);
 
+		/* disable mixing during the update */
+		r_status_flags &= ~PX4IO_P_STATUS_FLAGS_MIXER_OK;
+
 		/* check for overflow - this would be really fatal */
 		if ((mixer_text_length + text_length + 1) > sizeof(mixer_text)) {
 			r_status_flags &= ~PX4IO_P_STATUS_FLAGS_MIXER_OK;
-			return;
+			return 0;
 		}
 
-		/* append mixer text and nul-terminate */
+		/* append mixer text and nul-terminate, guard against overflow */
 		memcpy(&mixer_text[mixer_text_length], msg->text, text_length);
 		mixer_text_length += text_length;
 		mixer_text[mixer_text_length] = '\0';
@@ -369,6 +394,8 @@ mixer_handle_text(const void *buffer, size_t length)
 
 		break;
 	}
+
+	return 0;
 }
 
 static void
diff --git a/src/modules/px4iofirmware/protocol.h b/src/modules/px4iofirmware/protocol.h
index e5bef6eb3..d48c6c529 100644
--- a/src/modules/px4iofirmware/protocol.h
+++ b/src/modules/px4iofirmware/protocol.h
@@ -111,7 +111,6 @@
 #define PX4IO_P_STATUS_FLAGS_INIT_OK		(1 << 10) /* initialisation of the IO completed without error */
 #define PX4IO_P_STATUS_FLAGS_FAILSAFE		(1 << 11) /* failsafe is active */
 #define PX4IO_P_STATUS_FLAGS_SAFETY_OFF		(1 << 12) /* safety is off */
-#define PX4IO_P_STATUS_FLAGS_RC_DSM11		(1 << 13) /* DSM input is 11 bit data */
 
 #define PX4IO_P_STATUS_ALARMS			3	 /* alarm flags - alarms latch, write 1 to a bit to clear it */
 #define PX4IO_P_STATUS_ALARMS_VBATT_LOW		(1 << 0) /* [1] VBatt is very close to regulator dropout */
@@ -128,8 +127,6 @@
 #define PX4IO_P_STATUS_VSERVO			6	/* [2] servo rail voltage in mV */
 #define PX4IO_P_STATUS_VRSSI			7	/* [2] RSSI voltage */
 #define PX4IO_P_STATUS_PRSSI			8	/* [2] RSSI PWM value */
-#define PX4IO_P_STATUS_NRSSI			9	/* [2] Normalized RSSI value, 0: no reception, 255: perfect reception */
-#define PX4IO_P_STATUS_RC_DATA			10	/* [1] + [2] Details about the RC source (PPM frame length, Spektrum protocol type) */
 
 /* array of post-mix actuator outputs, -10000..10000 */
 #define PX4IO_PAGE_ACTUATORS		2		/* 0..CONFIG_ACTUATOR_COUNT-1 */
@@ -140,7 +137,17 @@
 /* array of raw RC input values, microseconds */
 #define PX4IO_PAGE_RAW_RC_INPUT		4
 #define PX4IO_P_RAW_RC_COUNT			0	/* number of valid channels */
-#define PX4IO_P_RAW_RC_BASE			1	/* CONFIG_RC_INPUT_COUNT channels from here */
+#define PX4IO_P_RAW_RC_FLAGS			1	/* RC detail status flags */
+#define PX4IO_P_RAW_RC_FLAGS_FRAME_DROP		(1 << 0) /* single frame drop */
+#define PX4IO_P_RAW_RC_FLAGS_FAILSAFE		(1 << 1) /* receiver is in failsafe mode */
+#define PX4IO_P_RAW_RC_FLAGS_RC_DSM11		(1 << 2) /* DSM decoding is 11 bit mode */
+#define PX4IO_P_RAW_RC_FLAGS_MAPPING_OK		(1 << 3) /* Channel mapping is ok */
+
+#define PX4IO_P_RAW_RC_NRSSI			2	/* [2] Normalized RSSI value, 0: no reception, 255: perfect reception */
+#define PX4IO_P_RAW_RC_DATA			3	/* [1] + [2] Details about the RC source (PPM frame length, Spektrum protocol type) */
+#define PX4IO_P_RAW_FRAME_COUNT			4	/* Number of total received frames (wrapping counter) */
+#define PX4IO_P_RAW_LOST_FRAME_COUNT		5	/* Number of total dropped frames (wrapping counter) */
+#define PX4IO_P_RAW_RC_BASE			6	/* CONFIG_RC_INPUT_COUNT channels from here */
 
 /* array of scaled RC input values, -10000..10000 */
 #define PX4IO_PAGE_RC_INPUT		5
@@ -157,6 +164,10 @@
 /* setup page */
 #define PX4IO_PAGE_SETUP		50
 #define PX4IO_P_SETUP_FEATURES			0
+#define PX4IO_P_SETUP_FEATURES_SBUS1_OUT	(1 << 0) /* enable S.Bus v1 output */
+#define PX4IO_P_SETUP_FEATURES_SBUS2_OUT	(1 << 1) /* enable S.Bus v2 output */
+#define PX4IO_P_SETUP_FEATURES_PWM_RSSI		(1 << 2) /* enable PWM RSSI parsing */
+#define PX4IO_P_SETUP_FEATURES_ADC_RSSI		(1 << 3) /* enable ADC RSSI parsing */
 
 #define PX4IO_P_SETUP_ARMING			1	 /* arming controls */
 #define PX4IO_P_SETUP_ARMING_IO_ARM_OK		(1 << 0) /* OK to arm the IO side */
@@ -166,6 +177,7 @@
 #define PX4IO_P_SETUP_ARMING_INAIR_RESTART_OK	(1 << 4) /* OK to try in-air restart */
 #define PX4IO_P_SETUP_ARMING_ALWAYS_PWM_ENABLE	(1 << 5) /* Output of PWM right after startup enabled to help ESCs initialize and prevent them from beeping */
 #define PX4IO_P_SETUP_ARMING_RC_HANDLING_DISABLED	(1 << 6) /* Disable the IO-internal evaluation of the RC */
+#define PX4IO_P_SETUP_ARMING_LOCKDOWN		(1 << 7) /* If set, the system operates normally, but won't actuate any servos */
 
 #define PX4IO_P_SETUP_PWM_RATES			2	/* bitmask, 0 = low rate, 1 = high rate */
 #define PX4IO_P_SETUP_PWM_DEFAULTRATE		3	/* 'low' PWM frame output rate in Hz */
diff --git a/src/modules/px4iofirmware/px4io.c b/src/modules/px4iofirmware/px4io.c
index 0b8c4a6a8..d4c25911e 100644
--- a/src/modules/px4iofirmware/px4io.c
+++ b/src/modules/px4iofirmware/px4io.c
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -196,6 +196,11 @@ user_start(int argc, char *argv[])
 	POWER_SERVO(true);
 #endif
 
+	/* turn off S.Bus out (if supported) */
+#ifdef ENABLE_SBUS_OUT
+	ENABLE_SBUS_OUT(false);
+#endif
+
 	/* start the safety switch handler */
 	safety_init();
 
@@ -205,6 +210,9 @@ user_start(int argc, char *argv[])
 	/* initialise the control inputs */
 	controls_init();
 
+	/* set up the ADC */
+	adc_init();
+
 	/* start the FMU interface */
 	interface_init();
 
@@ -223,24 +231,41 @@ user_start(int argc, char *argv[])
 	/* initialize PWM limit lib */
 	pwm_limit_init(&pwm_limit);
 
-#if 0
-	/* not enough memory, lock down */
-	if (minfo.mxordblk < 500) {
+	/*
+	 *    P O L I C E    L I G H T S
+	 *
+	 * Not enough memory, lock down.
+	 *
+	 * We might need to allocate mixers later, and this will
+	 * ensure that a developer doing a change will notice
+	 * that he just burned the remaining RAM with static
+	 * allocations. We don't want him to be able to
+	 * get past that point. This needs to be clearly
+	 * documented in the dev guide.
+         *
+	 */
+	if (minfo.mxordblk < 600) {
+
 		lowsyslog("ERR: not enough MEM");
 		bool phase = false;
 
-		if (phase) {
-			LED_AMBER(true);
-			LED_BLUE(false);
-		} else {
-			LED_AMBER(false);
-			LED_BLUE(true);
-		}
+		while (true) {
+
+			if (phase) {
+				LED_AMBER(true);
+				LED_BLUE(false);
+			} else {
+				LED_AMBER(false);
+				LED_BLUE(true);
+			}
+			up_udelay(250000);
 
-		phase = !phase;
-		usleep(300000);
+			phase = !phase;
+		}
 	}
-#endif
+
+	/* Start the failsafe led init */
+	failsafe_led_init();
 
 	/*
 	 * Run everything in a tight loop.
@@ -270,11 +295,12 @@ user_start(int argc, char *argv[])
 
                 check_reboot();
 
-#if 0
-		/* check for debug activity */
+		/* check for debug activity (default: none) */
 		show_debug_messages();
 
-		/* post debug state at ~1Hz */
+		/* post debug state at ~1Hz - this is via an auxiliary serial port
+		 * DEFAULTS TO OFF!
+		 */
 		if (hrt_absolute_time() - last_debug_time > (1000 * 1000)) {
 
 			struct mallinfo minfo = mallinfo();
@@ -287,7 +313,6 @@ user_start(int argc, char *argv[])
 				  (unsigned)minfo.mxordblk);
 			last_debug_time = hrt_absolute_time();
 		}
-#endif
 	}
 }
 
diff --git a/src/modules/px4iofirmware/px4io.h b/src/modules/px4iofirmware/px4io.h
index a0daa97ea..bb224f388 100644
--- a/src/modules/px4iofirmware/px4io.h
+++ b/src/modules/px4iofirmware/px4io.h
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -96,8 +96,9 @@ extern uint16_t			r_page_servo_disarmed[];	/* PX4IO_PAGE_DISARMED_PWM */
 
 #define r_raw_rc_count		r_page_raw_rc_input[PX4IO_P_RAW_RC_COUNT]
 #define r_raw_rc_values		(&r_page_raw_rc_input[PX4IO_P_RAW_RC_BASE])
+#define r_raw_rc_flags		r_page_raw_rc_input[PX4IO_P_RAW_RC_FLAGS]
 #define r_rc_valid		r_page_rc_input[PX4IO_P_RC_VALID]
-#define r_rc_values		(&r_page_rc_input[PX4IO_P_RAW_RC_BASE])
+#define r_rc_values		(&r_page_rc_input[PX4IO_P_RC_BASE])
 
 #define r_setup_features	r_page_setup[PX4IO_P_SETUP_FEATURES]
 #define r_setup_arming		r_page_setup[PX4IO_P_SETUP_ARMING]
@@ -115,7 +116,8 @@ extern uint16_t			r_page_servo_disarmed[];	/* PX4IO_PAGE_DISARMED_PWM */
  */
 struct sys_state_s {
 
-	volatile uint64_t	rc_channels_timestamp;
+	volatile uint64_t	rc_channels_timestamp_received;
+	volatile uint64_t	rc_channels_timestamp_valid;
 
 	/**
 	 * Last FMU receive time, in microseconds since system boot
@@ -160,6 +162,7 @@ extern pwm_limit_t pwm_limit;
 
 # define PX4IO_RELAY_CHANNELS		0
 # define POWER_SPEKTRUM(_s)		stm32_gpiowrite(GPIO_SPEKTRUM_PWR_EN, (_s))
+# define ENABLE_SBUS_OUT(_s)		stm32_gpiowrite(GPIO_SBUS_OENABLE, !(_s))
 
 # define VDD_SERVO_FAULT		(!stm32_gpioread(GPIO_SERVO_FAULT_DETECT))
 
@@ -177,12 +180,13 @@ extern pwm_limit_t pwm_limit;
  * Mixer
  */
 extern void	mixer_tick(void);
-extern void	mixer_handle_text(const void *buffer, size_t length);
+extern int	mixer_handle_text(const void *buffer, size_t length);
 
 /**
  * Safety switch/LED.
  */
 extern void	safety_init(void);
+extern void	failsafe_led_init(void);
 
 /**
  * FMU communications
@@ -213,7 +217,7 @@ extern int	dsm_init(const char *device);
 extern bool	dsm_input(uint16_t *values, uint16_t *num_values);
 extern void	dsm_bind(uint16_t cmd, int pulses);
 extern int	sbus_init(const char *device);
-extern bool	sbus_input(uint16_t *values, uint16_t *num_values, uint16_t *rssi, uint16_t max_channels);
+extern bool	sbus_input(uint16_t *values, uint16_t *num_values, bool *sbus_failsafe, bool *sbus_frame_drop, uint16_t max_channels);
 
 /** global debug level for isr_debug() */
 extern volatile uint8_t debug_level;
diff --git a/src/modules/px4iofirmware/registers.c b/src/modules/px4iofirmware/registers.c
index ad4473073..1335f52e1 100644
--- a/src/modules/px4iofirmware/registers.c
+++ b/src/modules/px4iofirmware/registers.c
@@ -90,8 +90,6 @@ uint16_t		r_page_status[] = {
 	[PX4IO_P_STATUS_VSERVO]			= 0,
 	[PX4IO_P_STATUS_VRSSI]			= 0,
 	[PX4IO_P_STATUS_PRSSI]			= 0,
-	[PX4IO_P_STATUS_NRSSI]			= 0,
-	[PX4IO_P_STATUS_RC_DATA]		= 0
 };
 
 /**
@@ -116,6 +114,12 @@ uint16_t		r_page_servos[PX4IO_SERVO_COUNT];
 uint16_t		r_page_raw_rc_input[] =
 {
 	[PX4IO_P_RAW_RC_COUNT]			= 0,
+	[PX4IO_P_RAW_RC_FLAGS]			= 0,
+	[PX4IO_P_RAW_RC_NRSSI]			= 0,
+	[PX4IO_P_RAW_RC_DATA]			= 0,
+	[PX4IO_P_RAW_FRAME_COUNT]		= 0,
+	[PX4IO_P_RAW_LOST_FRAME_COUNT]		= 0,
+	[PX4IO_P_RAW_RC_DATA]			= 0,
 	[PX4IO_P_RAW_RC_BASE ... (PX4IO_P_RAW_RC_BASE + PX4IO_RC_INPUT_CHANNELS)] = 0
 };
 
@@ -144,7 +148,12 @@ uint16_t		r_page_scratch[32];
  */
 volatile uint16_t	r_page_setup[] =
 {
+#ifdef CONFIG_ARCH_BOARD_PX4IO_V2
+	/* default to RSSI ADC functionality */
+	[PX4IO_P_SETUP_FEATURES]		= PX4IO_P_SETUP_FEATURES_ADC_RSSI,
+#else
 	[PX4IO_P_SETUP_FEATURES]		= 0,
+#endif
 	[PX4IO_P_SETUP_ARMING]			= 0,
 	[PX4IO_P_SETUP_PWM_RATES]		= 0,
 	[PX4IO_P_SETUP_PWM_DEFAULTRATE]		= 50,
@@ -162,14 +171,22 @@ volatile uint16_t	r_page_setup[] =
 	[PX4IO_P_SETUP_CRC ... (PX4IO_P_SETUP_CRC+1)] = 0,
 };
 
-#define PX4IO_P_SETUP_FEATURES_VALID	(0)
+#ifdef CONFIG_ARCH_BOARD_PX4IO_V2
+#define PX4IO_P_SETUP_FEATURES_VALID	(PX4IO_P_SETUP_FEATURES_SBUS1_OUT | \
+					 PX4IO_P_SETUP_FEATURES_SBUS2_OUT | \
+					 PX4IO_P_SETUP_FEATURES_ADC_RSSI | \
+					 PX4IO_P_SETUP_FEATURES_PWM_RSSI)
+#else
+#define PX4IO_P_SETUP_FEATURES_VALID	0
+#endif
 #define PX4IO_P_SETUP_ARMING_VALID	(PX4IO_P_SETUP_ARMING_FMU_ARMED | \
 					 PX4IO_P_SETUP_ARMING_MANUAL_OVERRIDE_OK | \
 					 PX4IO_P_SETUP_ARMING_INAIR_RESTART_OK | \
 					 PX4IO_P_SETUP_ARMING_IO_ARM_OK | \
 					 PX4IO_P_SETUP_ARMING_FAILSAFE_CUSTOM | \
 					 PX4IO_P_SETUP_ARMING_ALWAYS_PWM_ENABLE | \
-					 PX4IO_P_SETUP_ARMING_RC_HANDLING_DISABLED)
+					 PX4IO_P_SETUP_ARMING_RC_HANDLING_DISABLED | \
+					 PX4IO_P_SETUP_ARMING_LOCKDOWN)
 #define PX4IO_P_SETUP_RATES_VALID	((1 << PX4IO_SERVO_COUNT) - 1)
 #define PX4IO_P_SETUP_RELAYS_VALID	((1 << PX4IO_RELAY_CHANNELS) - 1)
 
@@ -382,7 +399,10 @@ registers_set(uint8_t page, uint8_t offset, const uint16_t *values, unsigned num
 
 		/* handle text going to the mixer parser */
 	case PX4IO_PAGE_MIXERLOAD:
-		mixer_handle_text(values, num_values * sizeof(*values));
+		if (!(r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF) ||
+				    (r_status_flags & PX4IO_P_STATUS_FLAGS_OUTPUTS_ARMED)) {
+			return mixer_handle_text(values, num_values * sizeof(*values));
+		}
 		break;
 
 	default:
@@ -435,9 +455,35 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 		case PX4IO_P_SETUP_FEATURES:
 
 			value &= PX4IO_P_SETUP_FEATURES_VALID;
-			r_setup_features = value;
 
-			/* no implemented feature selection at this point */
+			/* some of the options conflict - give S.BUS out precedence, then ADC RSSI, then PWM RSSI */
+
+			/* switch S.Bus output pin as needed */
+			#ifdef ENABLE_SBUS_OUT
+			ENABLE_SBUS_OUT(value & (PX4IO_P_SETUP_FEATURES_SBUS1_OUT | PX4IO_P_SETUP_FEATURES_SBUS2_OUT));
+
+			/* disable the conflicting options */
+			if (value & (PX4IO_P_SETUP_FEATURES_SBUS1_OUT | PX4IO_P_SETUP_FEATURES_SBUS2_OUT)) {
+				value &= ~(PX4IO_P_SETUP_FEATURES_PWM_RSSI | PX4IO_P_SETUP_FEATURES_ADC_RSSI);
+			}
+			#endif
+
+			/* disable the conflicting options with ADC RSSI */
+			if (value & (PX4IO_P_SETUP_FEATURES_ADC_RSSI)) {
+				value &= ~(PX4IO_P_SETUP_FEATURES_PWM_RSSI |
+					PX4IO_P_SETUP_FEATURES_SBUS1_OUT |
+					PX4IO_P_SETUP_FEATURES_SBUS2_OUT);
+			}
+
+			/* disable the conflicting options with PWM RSSI (without effect here, but for completeness) */
+			if (value & (PX4IO_P_SETUP_FEATURES_PWM_RSSI)) {
+				value &= ~(PX4IO_P_SETUP_FEATURES_ADC_RSSI |
+					PX4IO_P_SETUP_FEATURES_SBUS1_OUT |
+					PX4IO_P_SETUP_FEATURES_SBUS2_OUT);
+			}
+
+			/* apply changes */
+			r_setup_features = value;
 
 			break;
 
@@ -453,11 +499,6 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 			 * lockup of the IO arming state.
 			 */
 
-			// XXX do not reset IO's safety state by FMU for now
-			// if ((r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED) && !(value & PX4IO_P_SETUP_ARMING_FMU_ARMED)) {
-			// 	r_status_flags &= ~PX4IO_P_STATUS_FLAGS_ARMED;
-			// }
-
 			if (value & PX4IO_P_SETUP_ARMING_RC_HANDLING_DISABLED) {
 				r_status_flags |= PX4IO_P_STATUS_FLAGS_INIT_OK;
 			}
@@ -509,8 +550,7 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 
 		case PX4IO_P_SETUP_REBOOT_BL:
 			if ((r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF) ||
-			    (r_status_flags & PX4IO_P_STATUS_FLAGS_OVERRIDE) ||
-			    (r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED)) {
+			    (r_status_flags & PX4IO_P_STATUS_FLAGS_OUTPUTS_ARMED)) {
 				// don't allow reboot while armed
 				break;
 			}
@@ -540,8 +580,7 @@ registers_set_one(uint8_t page, uint8_t offset, uint16_t value)
 		 * do not allow a RC config change while outputs armed
 		 */
 		if ((r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF) ||
-			(r_status_flags & PX4IO_P_STATUS_FLAGS_OVERRIDE) ||
-			(r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED)) {
+			    (r_status_flags & PX4IO_P_STATUS_FLAGS_OUTPUTS_ARMED)) {
 			break;
 		}
 
diff --git a/src/modules/px4iofirmware/safety.c b/src/modules/px4iofirmware/safety.c
index cdb54a80a..ff2e4af6e 100644
--- a/src/modules/px4iofirmware/safety.c
+++ b/src/modules/px4iofirmware/safety.c
@@ -45,7 +45,6 @@
 #include "px4io.h"
 
 static struct hrt_call arming_call;
-static struct hrt_call heartbeat_call;
 static struct hrt_call failsafe_call;
 
 /*
@@ -84,7 +83,11 @@ safety_init(void)
 {
 	/* arrange for the button handler to be called at 10Hz */
 	hrt_call_every(&arming_call, 1000, 100000, safety_check_button, NULL);
+}
 
+void
+failsafe_led_init(void)
+{
 	/* arrange for the failsafe blinker to be called at 8Hz */
 	hrt_call_every(&failsafe_call, 1000, 125000, failsafe_blink, NULL);
 }
@@ -165,8 +168,8 @@ failsafe_blink(void *arg)
 	/* indicate that a serious initialisation error occured */
 	if (!(r_status_flags & PX4IO_P_STATUS_FLAGS_INIT_OK)) {
 		LED_AMBER(true);
-	    return;
-    }
+		return;
+	}
 
 	static bool failsafe = false;
 
diff --git a/src/modules/px4iofirmware/sbus.c b/src/modules/px4iofirmware/sbus.c
index 11ccd7356..f6ec542eb 100644
--- a/src/modules/px4iofirmware/sbus.c
+++ b/src/modules/px4iofirmware/sbus.c
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2014 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -87,7 +87,7 @@ static unsigned partial_frame_count;
 
 unsigned sbus_frame_drops;
 
-static bool sbus_decode(hrt_abstime frame_time, uint16_t *values, uint16_t *num_values, uint16_t *rssi, uint16_t max_channels);
+static bool sbus_decode(hrt_abstime frame_time, uint16_t *values, uint16_t *num_values, bool *sbus_failsafe, bool *sbus_frame_drop, uint16_t max_channels);
 
 int
 sbus_init(const char *device)
@@ -118,7 +118,7 @@ sbus_init(const char *device)
 }
 
 bool
-sbus_input(uint16_t *values, uint16_t *num_values, uint16_t *rssi, uint16_t max_channels)
+sbus_input(uint16_t *values, uint16_t *num_values, bool *sbus_failsafe, bool *sbus_frame_drop, uint16_t max_channels)
 {
 	ssize_t		ret;
 	hrt_abstime	now;
@@ -175,7 +175,7 @@ sbus_input(uint16_t *values, uint16_t *num_values, uint16_t *rssi, uint16_t max_
 	 * decode it.
 	 */
 	partial_frame_count = 0;
-	return sbus_decode(now, values, num_values, rssi, max_channels);
+	return sbus_decode(now, values, num_values, sbus_failsafe, sbus_frame_drop, max_channels);
 }
 
 /*
@@ -215,14 +215,36 @@ static const struct sbus_bit_pick sbus_decoder[SBUS_INPUT_CHANNELS][3] = {
 };
 
 static bool
-sbus_decode(hrt_abstime frame_time, uint16_t *values, uint16_t *num_values, uint16_t *rssi, uint16_t max_values)
+sbus_decode(hrt_abstime frame_time, uint16_t *values, uint16_t *num_values, bool *sbus_failsafe, bool *sbus_frame_drop, uint16_t max_values)
 {
 	/* check frame boundary markers to avoid out-of-sync cases */
-	if ((frame[0] != 0x0f) || (frame[24] != 0x00)) {
+	if ((frame[0] != 0x0f)) {
 		sbus_frame_drops++;
 		return false;
 	}
 
+	switch (frame[24]) {
+		case 0x00:
+		/* this is S.BUS 1 */
+		break;
+		case 0x03:
+		/* S.BUS 2 SLOT0: RX battery and external voltage */
+		break;
+		case 0x83:
+		/* S.BUS 2 SLOT1 */
+		break;
+		case 0x43:
+		case 0xC3:
+		case 0x23:
+		case 0xA3:
+		case 0x63:
+		case 0xE3:
+		break;
+		default:
+		/* we expect one of the bits above, but there are some we don't know yet */
+		break;
+	}
+
 	/* we have received something we think is a frame */
 	last_frame_time = frame_time;
 
@@ -267,20 +289,22 @@ sbus_decode(hrt_abstime frame_time, uint16_t *values, uint16_t *num_values, uint
 	/* decode and handle failsafe and frame-lost flags */
 	if (frame[SBUS_FLAGS_BYTE] & (1 << SBUS_FAILSAFE_BIT)) { /* failsafe */
 		/* report that we failed to read anything valid off the receiver */
-		*rssi = 0;
-		return false;
+		*sbus_failsafe = true;
+		*sbus_frame_drop = true;
 	}
 	else if (frame[SBUS_FLAGS_BYTE] & (1 << SBUS_FRAMELOST_BIT)) { /* a frame was lost */
-		/* set a special warning flag or try to calculate some kind of RSSI information - to be implemented 
+		/* set a special warning flag
 		 * 
 		 * Attention! This flag indicates a skipped frame only, not a total link loss! Handling this 
 		 * condition as fail-safe greatly reduces the reliability and range of the radio link, 
 		 * e.g. by prematurely issueing return-to-launch!!! */
 
-		*rssi = 100; // XXX magic number indicating bad signal, but not a signal loss (yet)
+		*sbus_failsafe = false;
+		*sbus_frame_drop = true;
+	} else {
+		*sbus_failsafe = false;
+		*sbus_frame_drop = false;
 	}
 
-	*rssi = 255;
-
 	return true;
 }
diff --git a/src/modules/sdlog2/sdlog2.c b/src/modules/sdlog2/sdlog2.c
index 06b1eddaa..c4fafb5a6 100644
--- a/src/modules/sdlog2/sdlog2.c
+++ b/src/modules/sdlog2/sdlog2.c
@@ -85,13 +85,13 @@
 
 #include <systemlib/systemlib.h>
 #include <systemlib/param/param.h>
+#include <version/version.h>
 
 #include <mavlink/mavlink_log.h>
 
 #include "logbuffer.h"
 #include "sdlog2_format.h"
 #include "sdlog2_messages.h"
-#include "sdlog2_version.h"
 
 #define LOGBUFFER_WRITE_AND_COUNT(_msg) if (logbuffer_write(&lb, &log_msg, LOG_PACKET_SIZE(_msg))) { \
 		log_msgs_written++; \
@@ -108,13 +108,13 @@ static bool main_thread_should_exit = false;		/**< Deamon exit flag */
 static bool thread_running = false;			/**< Deamon status flag */
 static int deamon_task;						/**< Handle of deamon task / thread */
 static bool logwriter_should_exit = false;	/**< Logwriter thread exit flag */
-static const int MAX_NO_LOGFOLDER = 999;	/**< Maximum number of log folders */
+static const int MAX_NO_LOGFOLDER = 999;	/**< Maximum number of log dirs */
 static const int MAX_NO_LOGFILE = 999;		/**< Maximum number of log files */
 static const int LOG_BUFFER_SIZE_DEFAULT = 8192;
 static const int MAX_WRITE_CHUNK = 512;
 static const int MIN_BYTES_TO_WRITE = 512;
 
-static const char *mountpoint = "/fs/microsd";
+static const char *log_root = "/fs/microsd/log";
 static int mavlink_fd = -1;
 struct logbuffer_s lb;
 
@@ -122,14 +122,17 @@ struct logbuffer_s lb;
 static pthread_mutex_t logbuffer_mutex;
 static pthread_cond_t logbuffer_cond;
 
-static char folder_path[64];
+static char log_dir[32];
 
 /* statistics counters */
-static unsigned long log_bytes_written = 0;
 static uint64_t start_time = 0;
+static unsigned long log_bytes_written = 0;
 static unsigned long log_msgs_written = 0;
 static unsigned long log_msgs_skipped = 0;
 
+/* GPS time, used for log files naming */
+static uint64_t gps_time = 0;
+
 /* current state of logging */
 static bool logging_enabled = false;
 /* enable logging on start (-e option) */
@@ -138,11 +141,14 @@ static bool log_on_start = false;
 static bool log_when_armed = false;
 /* delay = 1 / rate (rate defined by -r option) */
 static useconds_t sleep_delay = 0;
+/* use date/time for naming directories and files (-t option) */
+static bool log_name_timestamp = false;
 
 /* helper flag to track system state changes */
 static bool flag_system_armed = false;
 
 static pthread_t logwriter_pthread = 0;
+static pthread_attr_t logwriter_attr;
 
 /**
  * Log buffer writing thread. Open and close file here.
@@ -203,14 +209,14 @@ static void handle_command(struct vehicle_command_s *cmd);
 static void handle_status(struct vehicle_status_s *cmd);
 
 /**
- * Create folder for current logging session. Store folder name in 'log_folder'.
+ * Create dir for current logging session. Store dir name in 'log_dir'.
  */
-static int create_logfolder(void);
+static int create_log_dir(void);
 
 /**
  * Select first free log file name and open it.
  */
-static int open_logfile(void);
+static int open_log_file(void);
 
 static void
 sdlog2_usage(const char *reason)
@@ -218,11 +224,12 @@ sdlog2_usage(const char *reason)
 	if (reason)
 		fprintf(stderr, "%s\n", reason);
 
-	errx(1, "usage: sdlog2 {start|stop|status} [-r <log rate>] [-b <buffer size>] -e -a\n"
+	errx(1, "usage: sdlog2 {start|stop|status} [-r <log rate>] [-b <buffer size>] -e -a -t\n"
 	     "\t-r\tLog rate in Hz, 0 means unlimited rate\n"
 	     "\t-b\tLog buffer size in KiB, default is 8\n"
 	     "\t-e\tEnable logging by default (if not, can be started by command)\n"
-	     "\t-a\tLog only when armed (can be still overriden by command)\n");
+	     "\t-a\tLog only when armed (can be still overriden by command)\n"
+	     "\t-t\tUse date/time for naming log directories and files\n");
 }
 
 /**
@@ -280,82 +287,112 @@ int sdlog2_main(int argc, char *argv[])
 	exit(1);
 }
 
-int create_logfolder()
+int create_log_dir()
 {
-	/* make folder on sdcard */
-	uint16_t folder_number = 1; // start with folder sess001
+	/* create dir on sdcard if needed */
+	uint16_t dir_number = 1; // start with dir sess001
 	int mkdir_ret;
 
-	/* look for the next folder that does not exist */
-	while (folder_number <= MAX_NO_LOGFOLDER) {
-		/* set up folder path: e.g. /fs/microsd/sess001 */
-		sprintf(folder_path, "%s/sess%03u", mountpoint, folder_number);
-		mkdir_ret = mkdir(folder_path, S_IRWXU | S_IRWXG | S_IRWXO);
-		/* the result is -1 if the folder exists */
+	if (log_name_timestamp && gps_time != 0) {
+		/* use GPS date for log dir naming: e.g. /fs/microsd/2014-01-19 */
+		time_t gps_time_sec = gps_time / 1000000;
+		struct tm t;
+		gmtime_r(&gps_time_sec, &t);
+		int n = snprintf(log_dir, sizeof(log_dir), "%s/", log_root);
+		strftime(log_dir + n, sizeof(log_dir) - n, "%Y-%m-%d", &t);
+		mkdir_ret = mkdir(log_dir, S_IRWXU | S_IRWXG | S_IRWXO);
 
-		if (mkdir_ret == 0) {
-			/* folder does not exist, success */
-			break;
+		if (mkdir_ret == OK) {
+			warnx("log dir created: %s", log_dir);
+
+		} else if (errno != EEXIST) {
+			warn("failed creating new dir: %s", log_dir);
+			return -1;
+		}
+
+	} else {
+		/* look for the next dir that does not exist */
+		while (dir_number <= MAX_NO_LOGFOLDER) {
+			/* format log dir: e.g. /fs/microsd/sess001 */
+			sprintf(log_dir, "%s/sess%03u", log_root, dir_number);
+			mkdir_ret = mkdir(log_dir, S_IRWXU | S_IRWXG | S_IRWXO);
 
-		} else if (mkdir_ret == -1) {
-			/* folder exists already */
-			folder_number++;
+			if (mkdir_ret == 0) {
+				warnx("log dir created: %s", log_dir);
+				break;
+
+			} else if (errno != EEXIST) {
+				warn("failed creating new dir: %s", log_dir);
+				return -1;
+			}
+
+			/* dir exists already */
+			dir_number++;
 			continue;
+		}
 
-		} else {
-			warn("failed creating new folder");
+		if (dir_number >= MAX_NO_LOGFOLDER) {
+			/* we should not end up here, either we have more than MAX_NO_LOGFOLDER on the SD card, or another problem */
+			warnx("all %d possible dirs exist already", MAX_NO_LOGFOLDER);
 			return -1;
 		}
 	}
 
-	if (folder_number >= MAX_NO_LOGFOLDER) {
-		/* we should not end up here, either we have more than MAX_NO_LOGFOLDER on the SD card, or another problem */
-		warnx("all %d possible folders exist already.", MAX_NO_LOGFOLDER);
-		return -1;
-	}
-
+	/* print logging path, important to find log file later */
+	warnx("log dir: %s", log_dir);
+	mavlink_log_info(mavlink_fd, "[sdlog2] log dir: %s", log_dir);
 	return 0;
 }
 
-int open_logfile()
+int open_log_file()
 {
-	/* make folder on sdcard */
-	uint16_t file_number = 1; // start with file log001
-
 	/* string to hold the path to the log */
-	char path_buf[64] = "";
-
-	int fd = 0;
-
-	/* look for the next file that does not exist */
-	while (file_number <= MAX_NO_LOGFILE) {
-		/* set up file path: e.g. /fs/microsd/sess001/log001.bin */
-		sprintf(path_buf, "%s/log%03u.bin", folder_path, file_number);
+	char log_file_name[16] = "";
+	char log_file_path[48] = "";
+
+	if (log_name_timestamp && gps_time != 0) {
+		/* use GPS time for log file naming, e.g. /fs/microsd/2014-01-19/19_37_52.bin */
+		time_t gps_time_sec = gps_time / 1000000;
+		struct tm t;
+		gmtime_r(&gps_time_sec, &t);
+		strftime(log_file_name, sizeof(log_file_name), "%H_%M_%S.bin", &t);
+		snprintf(log_file_path, sizeof(log_file_path), "%s/%s", log_dir, log_file_name);
+
+	} else {
+		uint16_t file_number = 1; // start with file log001
+
+		/* look for the next file that does not exist */
+		while (file_number <= MAX_NO_LOGFILE) {
+			/* format log file path: e.g. /fs/microsd/sess001/log001.bin */
+			snprintf(log_file_name, sizeof(log_file_name), "log%03u.bin", file_number);
+			snprintf(log_file_path, sizeof(log_file_path), "%s/%s", log_dir, log_file_name);
+
+			if (!file_exist(log_file_path)) {
+				break;
+			}
 
-		if (file_exist(path_buf)) {
 			file_number++;
-			continue;
 		}
 
-		fd = open(path_buf, O_CREAT | O_WRONLY | O_DSYNC);
-
-		if (fd == 0) {
-			warn("opening %s failed", path_buf);
+		if (file_number > MAX_NO_LOGFILE) {
+			/* we should not end up here, either we have more than MAX_NO_LOGFILE on the SD card, or another problem */
+			warnx("all %d possible files exist already", MAX_NO_LOGFILE);
+			return -1;
 		}
+	}
 
-		warnx("logging to: %s.", path_buf);
-		mavlink_log_info(mavlink_fd, "[sdlog2] log: %s", path_buf);
+	int fd = open(log_file_path, O_CREAT | O_WRONLY | O_DSYNC);
 
-		return fd;
-	}
+	if (fd < 0) {
+		warn("failed opening log: %s", log_file_name);
+		mavlink_log_info(mavlink_fd, "[sdlog2] failed opening log: %s", log_file_name);
 
-	if (file_number > MAX_NO_LOGFILE) {
-		/* we should not end up here, either we have more than MAX_NO_LOGFILE on the SD card, or another problem */
-		warnx("all %d possible files exist already.", MAX_NO_LOGFILE);
-		return -1;
+	} else {
+		warnx("log file: %s", log_file_name);
+		mavlink_log_info(mavlink_fd, "[sdlog2] log file: %s", log_file_name);
 	}
 
-	return 0;
+	return fd;
 }
 
 static void *logwriter_thread(void *arg)
@@ -363,9 +400,12 @@ static void *logwriter_thread(void *arg)
 	/* set name */
 	prctl(PR_SET_NAME, "sdlog2_writer", 0);
 
-	struct logbuffer_s *logbuf = (struct logbuffer_s *)arg;
+	int log_fd = open_log_file();
 
-	int log_fd = open_logfile();
+	if (log_fd < 0)
+		return;
+
+	struct logbuffer_s *logbuf = (struct logbuffer_s *)arg;
 
 	/* write log messages formats, version and parameters */
 	log_bytes_written += write_formats(log_fd);
@@ -443,14 +483,20 @@ static void *logwriter_thread(void *arg)
 	fsync(log_fd);
 	close(log_fd);
 
-	return OK;
+	return;
 }
 
 void sdlog2_start_log()
 {
-	warnx("start logging.");
+	warnx("start logging");
 	mavlink_log_info(mavlink_fd, "[sdlog2] start logging");
 
+	/* create log dir if needed */
+	if (create_log_dir() != 0) {
+		mavlink_log_critical(mavlink_fd, "[sdlog2] error creating log dir");
+		errx(1, "error creating log dir");
+	}
+
 	/* initialize statistics counter */
 	log_bytes_written = 0;
 	start_time = hrt_absolute_time();
@@ -458,30 +504,28 @@ void sdlog2_start_log()
 	log_msgs_skipped = 0;
 
 	/* initialize log buffer emptying thread */
-	pthread_attr_t receiveloop_attr;
-	pthread_attr_init(&receiveloop_attr);
+	pthread_attr_init(&logwriter_attr);
 
 	struct sched_param param;
 	/* low priority, as this is expensive disk I/O */
 	param.sched_priority = SCHED_PRIORITY_DEFAULT - 40;
-	(void)pthread_attr_setschedparam(&receiveloop_attr, &param);
+	(void)pthread_attr_setschedparam(&logwriter_attr, &param);
 
-	pthread_attr_setstacksize(&receiveloop_attr, 2048);
+	pthread_attr_setstacksize(&logwriter_attr, 2048);
 
 	logwriter_should_exit = false;
 
 	/* start log buffer emptying thread */
-	if (0 != pthread_create(&logwriter_pthread, &receiveloop_attr, logwriter_thread, &lb)) {
+	if (0 != pthread_create(&logwriter_pthread, &logwriter_attr, logwriter_thread, &lb)) {
 		errx(1, "error creating logwriter thread");
 	}
 
 	logging_enabled = true;
-	// XXX we have to destroy the attr at some point
 }
 
 void sdlog2_stop_log()
 {
-	warnx("stop logging.");
+	warnx("stop logging");
 	mavlink_log_info(mavlink_fd, "[sdlog2] stop logging");
 
 	logging_enabled = false;
@@ -501,6 +545,7 @@ void sdlog2_stop_log()
 	}
 
 	logwriter_pthread = 0;
+	pthread_attr_destroy(&logwriter_attr);
 
 	sdlog2_status();
 }
@@ -569,8 +614,8 @@ int write_parameters(int fd)
 			}
 
 		case PARAM_TYPE_FLOAT:
-				param_get(param, &value);
-				break;
+			param_get(param, &value);
+			break;
 
 		default:
 			break;
@@ -588,18 +633,25 @@ int sdlog2_thread_main(int argc, char *argv[])
 	mavlink_fd = open(MAVLINK_LOG_DEVICE, 0);
 
 	if (mavlink_fd < 0) {
-		warnx("failed to open MAVLink log stream, start mavlink app first.");
+		warnx("failed to open MAVLink log stream, start mavlink app first");
 	}
 
 	/* log buffer size */
 	int log_buffer_size = LOG_BUFFER_SIZE_DEFAULT;
 
+	logging_enabled = false;
+	log_on_start = false;
+	log_when_armed = false;
+	log_name_timestamp = false;
+
+	flag_system_armed = false;
+
 	/* work around some stupidity in task_create's argv handling */
 	argc -= 2;
 	argv += 2;
 	int ch;
 
-	while ((ch = getopt(argc, argv, "r:b:ea")) != EOF) {
+	while ((ch = getopt(argc, argv, "r:b:eat")) != EOF) {
 		switch (ch) {
 		case 'r': {
 				unsigned long r = strtoul(optarg, NULL, 10);
@@ -632,49 +684,52 @@ int sdlog2_thread_main(int argc, char *argv[])
 			log_when_armed = true;
 			break;
 
+		case 't':
+			log_name_timestamp = true;
+			break;
+
 		case '?':
 			if (optopt == 'c') {
-				warnx("Option -%c requires an argument.", optopt);
+				warnx("option -%c requires an argument", optopt);
 
 			} else if (isprint(optopt)) {
-				warnx("Unknown option `-%c'.", optopt);
+				warnx("unknown option `-%c'", optopt);
 
 			} else {
-				warnx("Unknown option character `\\x%x'.", optopt);
+				warnx("unknown option character `\\x%x'", optopt);
 			}
 
 		default:
 			sdlog2_usage("unrecognized flag");
-			errx(1, "exiting.");
+			errx(1, "exiting");
 		}
 	}
 
-	if (!file_exist(mountpoint)) {
-		errx(1, "logging mount point %s not present, exiting.", mountpoint);
-	}
+	gps_time = 0;
+
+	/* create log root dir */
+	int mkdir_ret = mkdir(log_root, S_IRWXU | S_IRWXG | S_IRWXO);
 
-	if (create_logfolder()) {
-		errx(1, "unable to create logging folder, exiting.");
+	if (mkdir_ret != 0 && errno != EEXIST) {
+		err("failed creating log root dir: %s", log_root);
 	}
 
+	/* copy conversion scripts */
 	const char *converter_in = "/etc/logging/conv.zip";
-	char *converter_out = malloc(120);
-	sprintf(converter_out, "%s/conv.zip", folder_path);
+	char *converter_out = malloc(64);
+	snprintf(converter_out, 64, "%s/conv.zip", log_root);
 
-	if (file_copy(converter_in, converter_out)) {
-		errx(1, "unable to copy conversion scripts, exiting.");
+	if (file_copy(converter_in, converter_out) != OK) {
+		warn("unable to copy conversion scripts");
 	}
 
 	free(converter_out);
 
-	/* only print logging path, important to find log file later */
-	warnx("logging to directory: %s", folder_path);
-
 	/* initialize log buffer with specified size */
-	warnx("log buffer size: %i bytes.", log_buffer_size);
+	warnx("log buffer size: %i bytes", log_buffer_size);
 
 	if (OK != logbuffer_init(&lb, log_buffer_size)) {
-		errx(1, "can't allocate log buffer, exiting.");
+		errx(1, "can't allocate log buffer, exiting");
 	}
 
 	struct vehicle_status_s buf_status;
@@ -895,7 +950,7 @@ int sdlog2_thread_main(int argc, char *argv[])
 	 * differs from the number of messages in the above list.
 	 */
 	if (fdsc_count > fdsc) {
-		warn("WARNING: Not enough space for poll fds allocated. Check %s:%d.", __FILE__, __LINE__);
+		warn("WARNING: Not enough space for poll fds allocated. Check %s:%d", __FILE__, __LINE__);
 		fdsc_count = fdsc;
 	}
 
@@ -919,19 +974,27 @@ int sdlog2_thread_main(int argc, char *argv[])
 	uint16_t differential_pressure_counter = 0;
 
 	/* enable logging on start if needed */
-	if (log_on_start)
+	if (log_on_start) {
+		/* check GPS topic to get GPS time */
+		if (log_name_timestamp) {
+			if (OK == orb_copy(ORB_ID(vehicle_gps_position), subs.gps_pos_sub, &buf.gps_pos)) {
+				gps_time = buf.gps_pos.time_gps_usec;
+			}
+		}
+
 		sdlog2_start_log();
+	}
 
 	while (!main_thread_should_exit) {
 		/* decide use usleep() or blocking poll() */
 		bool use_sleep = sleep_delay > 0 && logging_enabled;
 
 		/* poll all topics if logging enabled or only management (first 2) if not */
-		int poll_ret = poll(fds, logging_enabled ? fdsc_count : 2, use_sleep ? 0 : poll_timeout);
+		int poll_ret = poll(fds, logging_enabled ? fdsc_count : 3, use_sleep ? 0 : poll_timeout);
 
 		/* handle the poll result */
 		if (poll_ret < 0) {
-			warnx("ERROR: poll error, stop logging.");
+			warnx("ERROR: poll error, stop logging");
 			main_thread_should_exit = true;
 
 		} else if (poll_ret > 0) {
@@ -960,6 +1023,17 @@ int sdlog2_thread_main(int argc, char *argv[])
 				handled_topics++;
 			}
 
+			/* --- GPS POSITION - LOG MANAGEMENT --- */
+			if (fds[ifds++].revents & POLLIN) {
+				orb_copy(ORB_ID(vehicle_gps_position), subs.gps_pos_sub, &buf.gps_pos);
+
+				if (log_name_timestamp) {
+					gps_time = buf.gps_pos.time_gps_usec;
+				}
+
+				handled_topics++;
+			}
+
 			if (!logging_enabled || !check_data || handled_topics >= poll_ret) {
 				continue;
 			}
@@ -988,7 +1062,7 @@ int sdlog2_thread_main(int argc, char *argv[])
 
 			/* --- GPS POSITION --- */
 			if (fds[ifds++].revents & POLLIN) {
-				orb_copy(ORB_ID(vehicle_gps_position), subs.gps_pos_sub, &buf.gps_pos);
+				// Don't orb_copy, it's already done few lines above
 				log_msg.msg_type = LOG_GPS_MSG;
 				log_msg.body.log_GPS.gps_time = buf.gps_pos.time_gps_usec;
 				log_msg.body.log_GPS.fix_type = buf.gps_pos.fix_type;
@@ -1279,7 +1353,7 @@ int sdlog2_thread_main(int argc, char *argv[])
 
 	free(lb.data);
 
-	warnx("exiting.");
+	warnx("exiting");
 
 	thread_running = false;
 
@@ -1292,8 +1366,8 @@ void sdlog2_status()
 	float mebibytes = kibibytes / 1024.0f;
 	float seconds = ((float)(hrt_absolute_time() - start_time)) / 1000000.0f;
 
-	warnx("wrote %lu msgs, %4.2f MiB (average %5.3f KiB/s), skipped %lu msgs.", log_msgs_written, (double)mebibytes, (double)(kibibytes / seconds), log_msgs_skipped);
-	mavlink_log_info(mavlink_fd, "[sdlog2] wrote %lu msgs, skipped %lu msgs.", log_msgs_written, log_msgs_skipped);
+	warnx("wrote %lu msgs, %4.2f MiB (average %5.3f KiB/s), skipped %lu msgs", log_msgs_written, (double)mebibytes, (double)(kibibytes / seconds), log_msgs_skipped);
+	mavlink_log_info(mavlink_fd, "[sdlog2] wrote %lu msgs, skipped %lu msgs", log_msgs_written, log_msgs_skipped);
 }
 
 /**
@@ -1312,7 +1386,7 @@ int file_copy(const char *file_old, const char *file_new)
 	int ret = 0;
 
 	if (source == NULL) {
-		warnx("failed opening input file to copy.");
+		warnx("failed opening input file to copy");
 		return 1;
 	}
 
@@ -1320,7 +1394,7 @@ int file_copy(const char *file_old, const char *file_new)
 
 	if (target == NULL) {
 		fclose(source);
-		warnx("failed to open output file to copy.");
+		warnx("failed to open output file to copy");
 		return 1;
 	}
 
@@ -1331,7 +1405,7 @@ int file_copy(const char *file_old, const char *file_new)
 		ret = fwrite(buf, 1, nread, target);
 
 		if (ret <= 0) {
-			warnx("error writing file.");
+			warnx("error writing file");
 			ret = 1;
 			break;
 		}
diff --git a/src/modules/sdlog2/sdlog2_version.h b/src/modules/sdlog2/sdlog2_version.h
deleted file mode 100644
index c6a9ba638..000000000
--- a/src/modules/sdlog2/sdlog2_version.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/****************************************************************************
- *
- *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
- *   Author: Anton Babushkin <anton.babushkin@me.com>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file sdlog2_version.h
- *
- * Tools for system version detection.
- *
- * @author Anton Babushkin <anton.babushkin@me.com>
- */
-
-#ifndef SDLOG2_VERSION_H_
-#define SDLOG2_VERSION_H_
-
-/*
- GIT_VERSION is defined at build time via a Makefile call to the
- git command line.
- */
-#define FREEZE_STR(s) #s
-#define STRINGIFY(s) FREEZE_STR(s)
-#define FW_GIT STRINGIFY(GIT_VERSION)
-
-#ifdef CONFIG_ARCH_BOARD_PX4FMU_V1
-#define	HW_ARCH "PX4FMU_V1"
-#endif
-
-#ifdef CONFIG_ARCH_BOARD_PX4FMU_V2
-#define	HW_ARCH "PX4FMU_V2"
-#endif
-
-#endif /* SDLOG2_VERSION_H_ */
diff --git a/src/modules/sensors/sensor_params.c b/src/modules/sensors/sensor_params.c
index bbc84ef93..30659fd3a 100644
--- a/src/modules/sensors/sensor_params.c
+++ b/src/modules/sensors/sensor_params.c
@@ -381,14 +381,73 @@ PARAM_DEFINE_FLOAT(BAT_V_SCALING, 0.00459340659f);
 #endif
 PARAM_DEFINE_FLOAT(BAT_C_SCALING, 0.0124);	/* scaling for 3DR power brick */
 
+/**
+ * Roll control channel mapping.
+ *
+ * The channel index (starting from 1 for channel 1) indicates
+ * which channel should be used for reading roll inputs from.
+ * A value of zero indicates the switch is not assigned.
+ *
+ * @min 0
+ * @max 18
+ * @group Radio Calibration
+ */
 PARAM_DEFINE_INT32(RC_MAP_ROLL, 1);
+
+/**
+ * Pitch control channel mapping.
+ *
+ * The channel index (starting from 1 for channel 1) indicates
+ * which channel should be used for reading pitch inputs from.
+ * A value of zero indicates the switch is not assigned.
+ *
+ * @min 0
+ * @max 18
+ * @group Radio Calibration
+ */
 PARAM_DEFINE_INT32(RC_MAP_PITCH, 2);
+
+/**
+ * Throttle control channel mapping.
+ *
+ * The channel index (starting from 1 for channel 1) indicates
+ * which channel should be used for reading throttle inputs from.
+ * A value of zero indicates the switch is not assigned.
+ *
+ * @min 0
+ * @max 18
+ * @group Radio Calibration
+ */
 PARAM_DEFINE_INT32(RC_MAP_THROTTLE, 3);
+
+/**
+ * Yaw control channel mapping.
+ *
+ * The channel index (starting from 1 for channel 1) indicates
+ * which channel should be used for reading yaw inputs from.
+ * A value of zero indicates the switch is not assigned.
+ *
+ * @min 0
+ * @max 18
+ * @group Radio Calibration
+ */
 PARAM_DEFINE_INT32(RC_MAP_YAW, 4);
 
-PARAM_DEFINE_INT32(RC_MAP_MODE_SW, 5);
+/**
+ * Mode switch channel mapping.
+ *
+ * This is the main flight mode selector.
+ * The channel index (starting from 1 for channel 1) indicates
+ * which channel should be used for deciding about the main mode.
+ * A value of zero indicates the switch is not assigned.
+ *
+ * @min 0
+ * @max 18
+ * @group Radio Calibration
+ */
+PARAM_DEFINE_INT32(RC_MAP_MODE_SW, 0);
 PARAM_DEFINE_INT32(RC_MAP_RETURN_SW, 0);
-PARAM_DEFINE_INT32(RC_MAP_ASSIST_SW, 6);
+PARAM_DEFINE_INT32(RC_MAP_ASSIST_SW, 0);
 PARAM_DEFINE_INT32(RC_MAP_MISSIO_SW, 0);
 
 //PARAM_DEFINE_INT32(RC_MAP_OFFB_SW, 0);
diff --git a/src/modules/sensors/sensors.cpp b/src/modules/sensors/sensors.cpp
index ff6c5882e..b50a694eb 100644
--- a/src/modules/sensors/sensors.cpp
+++ b/src/modules/sensors/sensors.cpp
@@ -797,7 +797,6 @@ Sensors::accel_init()
 
 #endif
 
-		warnx("using system accel");
 		close(fd);
 	}
 }
@@ -837,7 +836,6 @@ Sensors::gyro_init()
 
 #endif
 
-		warnx("using system gyro");
 		close(fd);
 	}
 }
@@ -1278,6 +1276,9 @@ Sensors::rc_poll()
 
 		orb_copy(ORB_ID(input_rc), _rc_sub, &rc_input);
 
+		if (rc_input.rc_lost)
+			return;
+
 		struct manual_control_setpoint_s manual_control;
 		struct actuator_controls_s actuator_group_3;
 
@@ -1322,7 +1323,7 @@ Sensors::rc_poll()
 			channel_limit = _rc_max_chan_count;
 
 		/* we are accepting this message */
-		_rc_last_valid = rc_input.timestamp;
+		_rc_last_valid = rc_input.timestamp_last_signal;
 
 		/* Read out values from raw message */
 		for (unsigned int i = 0; i < channel_limit; i++) {
@@ -1371,9 +1372,9 @@ Sensors::rc_poll()
 		}
 
 		_rc.chan_count = rc_input.channel_count;
-		_rc.timestamp = rc_input.timestamp;
+		_rc.timestamp = rc_input.timestamp_last_signal;
 
-		manual_control.timestamp = rc_input.timestamp;
+		manual_control.timestamp = rc_input.timestamp_last_signal;
 
 		/* roll input - rolling right is stick-wise and rotation-wise positive */
 		manual_control.roll = limit_minus_one_to_one(_rc.chan[_rc.function[ROLL]].scaled);
@@ -1404,18 +1405,6 @@ Sensors::rc_poll()
 			manual_control.yaw *= _parameters.rc_scale_yaw;
 		}
 
-		/* mode switch input */
-		manual_control.mode_switch = limit_minus_one_to_one(_rc.chan[_rc.function[MODE]].scaled);
-
-		/* land switch input */
-		manual_control.return_switch = limit_minus_one_to_one(_rc.chan[_rc.function[RETURN]].scaled);
-
-		/* assisted switch input */
-		manual_control.assisted_switch = limit_minus_one_to_one(_rc.chan[_rc.function[ASSISTED]].scaled);
-
-		/* mission switch input */
-		manual_control.mission_switch = limit_minus_one_to_one(_rc.chan[_rc.function[MISSION]].scaled);
-
 		/* flaps */
 		if (_rc.function[FLAPS] >= 0) {
 
@@ -1434,6 +1423,16 @@ Sensors::rc_poll()
 			manual_control.mission_switch = limit_minus_one_to_one(_rc.chan[_rc.function[MISSION]].scaled);
 		}
 
+		/* land switch input */
+		if (_rc.function[RETURN] >= 0) {
+			manual_control.return_switch = limit_minus_one_to_one(_rc.chan[_rc.function[RETURN]].scaled);
+		}
+
+		/* assisted switch input */
+		if (_rc.function[ASSISTED] >= 0) {
+			manual_control.assisted_switch = limit_minus_one_to_one(_rc.chan[_rc.function[ASSISTED]].scaled);
+		}
+
 //		if (_rc.function[OFFBOARD_MODE] >= 0) {
 //			manual_control.auto_offboard_input_switch = limit_minus_one_to_one(_rc.chan[_rc.function[OFFBOARD_MODE]].scaled);
 //		}
@@ -1507,9 +1506,6 @@ void
 Sensors::task_main()
 {
 
-	/* inform about start */
-	warnx("Initializing..");
-
 	/* start individual sensors */
 	accel_init();
 	gyro_init();
@@ -1548,8 +1544,8 @@ Sensors::task_main()
 	raw.adc_voltage_v[3] = 0.0f;
 
 	memset(&_battery_status, 0, sizeof(_battery_status));
-	_battery_status.voltage_v = 0.0f;
-	_battery_status.voltage_filtered_v = 0.0f;
+	_battery_status.voltage_v = -1.0f;
+	_battery_status.voltage_filtered_v = -1.0f;
 	_battery_status.current_a = -1.0f;
 	_battery_status.discharged_mah = -1.0f;
 
diff --git a/src/modules/systemlib/cpuload.c b/src/modules/systemlib/cpuload.c
index afc5b072c..ccc516f39 100644
--- a/src/modules/systemlib/cpuload.c
+++ b/src/modules/systemlib/cpuload.c
@@ -93,8 +93,7 @@ void cpuload_initialize_once()
 #endif /* CONFIG_SCHED_WORKQUEUE */
 
 	// perform static initialization of "system" threads
-	for (system_load.total_count = 0; system_load.total_count < static_tasks_count; system_load.total_count++)
-	{
+	for (system_load.total_count = 0; system_load.total_count < static_tasks_count; system_load.total_count++) {
 		system_load.tasks[system_load.total_count].start_time = now;
 		system_load.tasks[system_load.total_count].total_runtime = 0;
 		system_load.tasks[system_load.total_count].curr_start_time = 0;
diff --git a/src/modules/systemlib/cpuload.h b/src/modules/systemlib/cpuload.h
index c7aa18d3c..16d132fdb 100644
--- a/src/modules/systemlib/cpuload.h
+++ b/src/modules/systemlib/cpuload.h
@@ -40,15 +40,15 @@ __BEGIN_DECLS
 #include <nuttx/sched.h>
 
 struct system_load_taskinfo_s {
-	uint64_t total_runtime;      ///< Runtime since start (start_time - total_runtime)/(start_time - current_time) = load
-	uint64_t curr_start_time;     ///< Start time of the current scheduling slot
-	uint64_t start_time;         ///< FIRST start time of task
-	FAR struct tcb_s *tcb;               ///<
-	bool valid;                  ///< Task is currently active / valid
+	uint64_t total_runtime;			///< Runtime since start (start_time - total_runtime)/(start_time - current_time) = load
+	uint64_t curr_start_time;		///< Start time of the current scheduling slot
+	uint64_t start_time;			///< FIRST start time of task
+	FAR struct tcb_s *tcb;			///<
+	bool valid;						///< Task is currently active / valid
 };
 
 struct system_load_s {
-	uint64_t start_time;         ///< Global start time of measurements
+	uint64_t start_time;			///< Global start time of measurements
 	struct system_load_taskinfo_s tasks[CONFIG_MAX_TASKS];
 	uint8_t initialized;
 	int total_count;
diff --git a/src/modules/systemlib/module.mk b/src/modules/systemlib/module.mk
index 8c6c300d6..3953b757d 100644
--- a/src/modules/systemlib/module.mk
+++ b/src/modules/systemlib/module.mk
@@ -51,5 +51,6 @@ SRCS		 = err.c \
 		   mavlink_log.c \
 		   rc_check.c \
 		   otp.c \
-		   board_serial.c
+		   board_serial.c \
+		   pwm_limit/pwm_limit.c
 
diff --git a/src/modules/systemlib/pwm_limit/pwm_limit.c b/src/modules/systemlib/pwm_limit/pwm_limit.c
index cac3dc82a..190b315f1 100644
--- a/src/modules/systemlib/pwm_limit/pwm_limit.c
+++ b/src/modules/systemlib/pwm_limit/pwm_limit.c
@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved.
  *   Author: Julian Oes <joes@student.ethz.ch>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -44,38 +44,53 @@
 #include <math.h>
 #include <stdbool.h>
 #include <drivers/drv_hrt.h>
+#include <stdio.h>
 
 void pwm_limit_init(pwm_limit_t *limit)
 {
-	limit->state = LIMIT_STATE_OFF;
+	limit->state = PWM_LIMIT_STATE_INIT;
 	limit->time_armed = 0;
 	return;
 }
 
-void pwm_limit_calc(const bool armed, const unsigned num_channels, const uint16_t *disarmed_pwm, const uint16_t *min_pwm, const uint16_t *max_pwm, float *output, uint16_t *effective_pwm, pwm_limit_t *limit)
+void pwm_limit_calc(const bool armed, const unsigned num_channels, const uint16_t *disarmed_pwm, const uint16_t *min_pwm, const uint16_t *max_pwm, const float *output, uint16_t *effective_pwm, pwm_limit_t *limit)
 {
+
 	/* first evaluate state changes */
 	switch (limit->state) {
-		case LIMIT_STATE_OFF:
-			if (armed)
-				limit->state = LIMIT_STATE_RAMP;
-			limit->time_armed = hrt_absolute_time();
+		case PWM_LIMIT_STATE_INIT:
+
+			if (armed) {
+
+				/* set arming time for the first call */
+				if (limit->time_armed == 0) {
+					limit->time_armed = hrt_absolute_time();
+				}
+
+				if (hrt_elapsed_time(&limit->time_armed) >= INIT_TIME_US) {
+					limit->state = PWM_LIMIT_STATE_OFF;
+				}
+			}
 			break;
-		case LIMIT_STATE_INIT:
-			if (!armed)
-				limit->state = LIMIT_STATE_OFF;
-			else if (hrt_absolute_time() - limit->time_armed >= INIT_TIME_US)
-				limit->state = LIMIT_STATE_RAMP;
+		case PWM_LIMIT_STATE_OFF:
+			if (armed) {
+				limit->state = PWM_LIMIT_STATE_RAMP;
+
+				/* reset arming time, used for ramp timing */
+				limit->time_armed = hrt_absolute_time();
+			}
 			break;
-		case LIMIT_STATE_RAMP:
-			if (!armed)
-				limit->state = LIMIT_STATE_OFF;
-			else if (hrt_absolute_time() - limit->time_armed >= INIT_TIME_US + RAMP_TIME_US)
-				limit->state = LIMIT_STATE_ON;
+		case PWM_LIMIT_STATE_RAMP:
+			if (!armed) {
+				limit->state = PWM_LIMIT_STATE_OFF;
+			} else if (hrt_elapsed_time(&limit->time_armed) >= RAMP_TIME_US) {
+				limit->state = PWM_LIMIT_STATE_ON;
+			}
 			break;
-		case LIMIT_STATE_ON:
-			if (!armed)
-				limit->state = LIMIT_STATE_OFF;
+		case PWM_LIMIT_STATE_ON:
+			if (!armed) {
+				limit->state = PWM_LIMIT_STATE_OFF;
+			}
 			break;
 		default:
 			break;
@@ -86,44 +101,47 @@ void pwm_limit_calc(const bool armed, const unsigned num_channels, const uint16_
 
 	/* then set effective_pwm based on state */
 	switch (limit->state) {
-		case LIMIT_STATE_OFF:
-		case LIMIT_STATE_INIT:
+		case PWM_LIMIT_STATE_OFF:
+		case PWM_LIMIT_STATE_INIT:
 			for (unsigned i=0; i<num_channels; i++) {
 				effective_pwm[i] = disarmed_pwm[i];
-				output[i] = 0.0f;
 			}
 			break;
-		case LIMIT_STATE_RAMP:
+		case PWM_LIMIT_STATE_RAMP:
+			{
+				hrt_abstime diff = hrt_elapsed_time(&limit->time_armed);
 
-			progress = (hrt_absolute_time() - INIT_TIME_US - limit->time_armed)*10000 / RAMP_TIME_US;
-			for (unsigned i=0; i<num_channels; i++) {
-                
-				uint16_t ramp_min_pwm;
-                
-				/* if a disarmed pwm value was set, blend between disarmed and min */
-				if (disarmed_pwm[i] > 0) {
-
-					/* safeguard against overflows */
-					uint16_t disarmed = disarmed_pwm[i];
-					if (disarmed > min_pwm[i])
-						disarmed = min_pwm[i];
-
-					uint16_t disarmed_min_diff = min_pwm[i] - disarmed;
-					ramp_min_pwm = disarmed + (disarmed_min_diff * progress) / 10000;
-				} else {
-                    
-					/* no disarmed pwm value set, choose min pwm */
-					ramp_min_pwm = min_pwm[i];
-				}
+				progress = diff * 10000 / RAMP_TIME_US;
+
+				for (unsigned i=0; i<num_channels; i++) {
+	                
+					uint16_t ramp_min_pwm;
+	                
+					/* if a disarmed pwm value was set, blend between disarmed and min */
+					if (disarmed_pwm[i] > 0) {
 
-				effective_pwm[i] = output[i] * (max_pwm[i] - ramp_min_pwm)/2 + (max_pwm[i] + ramp_min_pwm)/2;
-				output[i] = (float)progress/10000.0f * output[i];
+						/* safeguard against overflows */
+						unsigned disarmed = disarmed_pwm[i];
+						if (disarmed > min_pwm[i]) {
+							disarmed = min_pwm[i];
+						}
+
+						unsigned disarmed_min_diff = min_pwm[i] - disarmed;
+						ramp_min_pwm = disarmed + (disarmed_min_diff * progress) / 10000;
+
+					} else {
+	                    
+						/* no disarmed pwm value set, choose min pwm */
+						ramp_min_pwm = min_pwm[i];
+					}
+
+					effective_pwm[i] = output[i] * (max_pwm[i] - ramp_min_pwm)/2 + (max_pwm[i] + ramp_min_pwm)/2;
+				}
 			}
 			break;
-		case LIMIT_STATE_ON:
+		case PWM_LIMIT_STATE_ON:
 			for (unsigned i=0; i<num_channels; i++) {
 				effective_pwm[i] = output[i] * (max_pwm[i] - min_pwm[i])/2 + (max_pwm[i] + min_pwm[i])/2;
-				/* effective_output stays the same */
 			}
 			break;
 		default:
diff --git a/src/modules/systemlib/pwm_limit/pwm_limit.h b/src/modules/systemlib/pwm_limit/pwm_limit.h
index 9974770be..6a667ac6f 100644
--- a/src/modules/systemlib/pwm_limit/pwm_limit.h
+++ b/src/modules/systemlib/pwm_limit/pwm_limit.h
@@ -46,6 +46,8 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+__BEGIN_DECLS
+
 /*
  * time for the ESCs to initialize
  * (this is not actually needed if PWM is sent right after boot)
@@ -56,21 +58,21 @@
  */
 #define RAMP_TIME_US 2500000
 
+enum pwm_limit_state {
+	PWM_LIMIT_STATE_OFF = 0,
+	PWM_LIMIT_STATE_INIT,
+	PWM_LIMIT_STATE_RAMP,
+	PWM_LIMIT_STATE_ON
+};
+
 typedef struct {
-	enum {
-		LIMIT_STATE_OFF = 0,
-		LIMIT_STATE_INIT,
-		LIMIT_STATE_RAMP,
-		LIMIT_STATE_ON
-	} state;
+	enum pwm_limit_state state;
 	uint64_t time_armed;
 } pwm_limit_t;
 
-__BEGIN_DECLS
-
 __EXPORT void pwm_limit_init(pwm_limit_t *limit);
 
-__EXPORT void pwm_limit_calc(const bool armed, const unsigned num_channels, const uint16_t *disarmed_pwm, const uint16_t *min_pwm, const uint16_t *max_pwm, float *output, uint16_t *effective_pwm, pwm_limit_t *limit);
+__EXPORT void pwm_limit_calc(const bool armed, const unsigned num_channels, const uint16_t *disarmed_pwm, const uint16_t *min_pwm, const uint16_t *max_pwm, const float *output, uint16_t *effective_pwm, pwm_limit_t *limit);
 
 __END_DECLS
 
diff --git a/src/modules/uORB/topics/vehicle_status.h b/src/modules/uORB/topics/vehicle_status.h
index 1c184d3a7..6ea48a680 100644
--- a/src/modules/uORB/topics/vehicle_status.h
+++ b/src/modules/uORB/topics/vehicle_status.h
@@ -206,6 +206,7 @@ struct vehicle_status_s
 
 	bool rc_signal_found_once;
 	bool rc_signal_lost;				/**< true if RC reception lost */
+	bool rc_input_blocked;				/**< set if RC input should be ignored */
 
 	bool offboard_control_signal_found_once;
 	bool offboard_control_signal_lost;