/****************************************************************************
*
* 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
* 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 px4io.c
* Top-level logic for the PX4IO module.
*/
#include <nuttx/config.h>
#include <nuttx/arch.h>
#include <stdio.h> // required for task_create
#include <stdbool.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <poll.h>
#include <signal.h>
#include <crc32.h>
#include <drivers/drv_pwm_output.h>
#include <drivers/drv_hrt.h>
#include <systemlib/perf_counter.h>
#include <systemlib/pwm_limit/pwm_limit.h>
#include <stm32_uart.h>
#define DEBUG
#include "px4io.h"
__EXPORT int user_start(int argc, char *argv[]);
extern void up_cxxinitialize(void);
struct sys_state_s system_state;
static struct hrt_call serial_dma_call;
pwm_limit_t pwm_limit;
/*
* a set of debug buffers to allow us to send debug information from ISRs
*/
static volatile uint32_t msg_counter;
static volatile uint32_t last_msg_counter;
static volatile uint8_t msg_next_out, msg_next_in;
/*
* WARNING: too large buffers here consume the memory required
* for mixer handling. Do not allocate more than 80 bytes for
* output.
*/
#define NUM_MSG 2
static char msg[NUM_MSG][40];
static void heartbeat_blink(void);
static void ring_blink(void);
/*
* add a debug message to be printed on the console
*/
void
isr_debug(uint8_t level, const char *fmt, ...)
{
if (level > r_page_setup[PX4IO_P_SETUP_SET_DEBUG]) {
return;
}
va_list ap;
va_start(ap, fmt);
vsnprintf(msg[msg_next_in], sizeof(msg[0]), fmt, ap);
va_end(ap);
msg_next_in = (msg_next_in+1) % NUM_MSG;
msg_counter++;
}
/*
* show all pending debug messages
*/
static void
show_debug_messages(void)
{
if (msg_counter != last_msg_counter) {
uint32_t n = msg_counter - last_msg_counter;
if (n > NUM_MSG) n = NUM_MSG;
last_msg_counter = msg_counter;
while (n--) {
debug("%s", msg[msg_next_out]);
msg_next_out = (msg_next_out+1) % NUM_MSG;
}
}
}
static void
heartbeat_blink(void)
{
static bool heartbeat = false;
LED_BLUE(heartbeat = !heartbeat);
}
static void
ring_blink(void)
{
#ifdef GPIO_LED4
if (/* IO armed */ (r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF)
/* and FMU is armed */ && (r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED)) {
LED_RING(1);
return;
}
// XXX this led code does have
// intentionally a few magic numbers.
const unsigned max_brightness = 118;
static unsigned counter = 0;
static unsigned brightness = max_brightness;
static unsigned brightness_counter = 0;
static unsigned on_counter = 0;
if (brightness_counter < max_brightness) {
bool on = ((on_counter * 100) / brightness_counter+1) <= ((brightness * 100) / max_brightness+1);
// XXX once led is PWM driven,
// remove the ! in the line below
// to return to the proper breathe
// animation / pattern (currently inverted)
LED_RING(!on);
brightness_counter++;
if (on) {
on_counter++;
}
} else {
if (counter >= 62) {
counter = 0;
}
int n;
if (counter < 32) {
n = counter;
} else {
n = 62 - counter;
}
brightness = (n * n) / 8;
brightness_counter = 0;
on_counter = 0;
counter++;
}
#endif
}
static uint64_t reboot_time;
/**
schedule a reboot in time_delta_usec microseconds
*/
void schedule_reboot(uint32_t time_delta_usec)
{
reboot_time = hrt_absolute_time() + time_delta_usec;
}
/**
check for a scheduled reboot
*/
static void check_reboot(void)
{
if (reboot_time != 0 && hrt_absolute_time() > reboot_time) {
up_systemreset();
}
}
static void
calculate_fw_crc(void)
{
#define APP_SIZE_MAX 0xf000
#define APP_LOAD_ADDRESS 0x08001000
// compute CRC of the current firmware
uint32_t sum = 0;
for (unsigned p = 0; p < APP_SIZE_MAX; p += 4) {
uint32_t bytes = *(uint32_t *)(p + APP_LOAD_ADDRESS);
sum = crc32part((uint8_t *)&bytes, sizeof(bytes), sum);
}
r_page_setup[PX4IO_P_SETUP_CRC] = sum & 0xFFFF;
r_page_setup[PX4IO_P_SETUP_CRC+1] = sum >> 16;
}
int
user_start(int argc, char *argv[])
{
/* run C++ ctors before we go any further */
up_cxxinitialize();
/* reset all to zero */
memset(&system_state, 0, sizeof(system_state));
/* configure the high-resolution time/callout interface */
hrt_init();
/* calculate our fw CRC so FMU can decide if we need to update */
calculate_fw_crc();
/*
* Poll at 1ms intervals for received bytes that have not triggered
* a DMA event.
*/
#ifdef CONFIG_ARCH_DMA
hrt_call_every(&serial_dma_call, 1000, 1000, (hrt_callout)stm32_serial_dma_poll, NULL);
#endif
/* print some startup info */
lowsyslog(LOG_INFO, "\nPX4IO: starting\n");
/* default all the LEDs to off while we start */
LED_AMBER(false);
LED_BLUE(false);
LED_SAFETY(false);
#ifdef GPIO_LED4
LED_RING(false);
#endif
/* turn on servo power (if supported) */
#ifdef POWER_SERVO
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();
/* configure the first 8 PWM outputs (i.e. all of them) */
up_pwm_servo_init(0xff);
/* initialise the control inputs */
controls_init();
/* set up the ADC */
adc_init();
/* start the FMU interface */
interface_init();
/* add a performance counter for mixing */
perf_counter_t mixer_perf = perf_alloc(PC_ELAPSED, "mix");
/* add a performance counter for controls */
perf_counter_t controls_perf = perf_alloc(PC_ELAPSED, "controls");
/* and one for measuring the loop rate */
perf_counter_t loop_perf = perf_alloc(PC_INTERVAL, "loop");
struct mallinfo minfo = mallinfo();
lowsyslog(LOG_INFO, "MEM: free %u, largest %u\n", minfo.mxordblk, minfo.fordblks);
/* initialize PWM limit lib */
pwm_limit_init(&pwm_limit);
/*
* 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(LOG_ERR, "ERR: not enough MEM");
bool phase = false;
while (true) {
if (phase) {
LED_AMBER(true);
LED_BLUE(false);
} else {
LED_AMBER(false);
LED_BLUE(true);
}
up_udelay(250000);
phase = !phase;
}
}
/* Start the failsafe led init */
failsafe_led_init();
/*
* Run everything in a tight loop.
*/
uint64_t last_debug_time = 0;
uint64_t last_heartbeat_time = 0;
for (;;) {
/* track the rate at which the loop is running */
perf_count(loop_perf);
/* kick the mixer */
perf_begin(mixer_perf);
mixer_tick();
perf_end(mixer_perf);
/* kick the control inputs */
perf_begin(controls_perf);
controls_tick();
perf_end(controls_perf);
if ((hrt_absolute_time() - last_heartbeat_time) > 250*1000) {
last_heartbeat_time = hrt_absolute_time();
heartbeat_blink();
}
ring_blink();
check_reboot();
/* check for debug activity (default: none) */
show_debug_messages();
/* post debug state at ~1Hz - this is via an auxiliary serial port
* DEFAULTS TO OFF!
*/
if (hrt_absolute_time() - last_debug_time > (1000 * 1000)) {
isr_debug(1, "d:%u s=0x%x a=0x%x f=0x%x m=%u",
(unsigned)r_page_setup[PX4IO_P_SETUP_SET_DEBUG],
(unsigned)r_status_flags,
(unsigned)r_setup_arming,
(unsigned)r_setup_features,
(unsigned)mallinfo().mxordblk);
last_debug_time = hrt_absolute_time();
}
}
}