diff options
-rw-r--r-- | apps/commander/commander.c | 96 | ||||
-rw-r--r-- | apps/sensors/sensor_params.c | 2 | ||||
-rw-r--r-- | apps/sensors/sensors.cpp | 13 | ||||
-rw-r--r-- | apps/systemlib/airspeed.c | 20 | ||||
-rw-r--r-- | apps/uORB/topics/differential_pressure.h | 5 | ||||
-rw-r--r-- | apps/uORB/topics/vehicle_status.h | 1 |
6 files changed, 130 insertions, 7 deletions
diff --git a/apps/commander/commander.c b/apps/commander/commander.c index 42ca10f55..41f4e5674 100644 --- a/apps/commander/commander.c +++ b/apps/commander/commander.c @@ -80,6 +80,7 @@ #include <uORB/topics/subsystem_info.h> #include <uORB/topics/actuator_controls.h> #include <uORB/topics/parameter_update.h> +#include <uORB/topics/differential_pressure.h> #include <mavlink/mavlink_log.h> #include <systemlib/param/param.h> @@ -785,6 +786,79 @@ void do_accel_calibration(int status_pub, struct vehicle_status_s *status) close(sub_sensor_combined); } +void do_airspeed_calibration(int status_pub, struct vehicle_status_s *status) +{ + /* announce change */ + + mavlink_log_info(mavlink_fd, "keep it still"); + /* set to accel calibration mode */ + status->flag_preflight_airspeed_calibration = true; + state_machine_publish(status_pub, status, mavlink_fd); + + const int calibration_count = 2500; + + int sub_differential_pressure = orb_subscribe(ORB_ID(differential_pressure)); + struct differential_pressure_s differential_pressure; + + int calibration_counter = 0; + float airspeed_offset = 0.0f; + + while (calibration_counter < calibration_count) { + + /* wait blocking for new data */ + struct pollfd fds[1] = { { .fd = sub_differential_pressure, .events = POLLIN } }; + + int poll_ret = poll(fds, 1, 1000); + + if (poll_ret) { + orb_copy(ORB_ID(differential_pressure), sub_differential_pressure, &differential_pressure); + airspeed_offset += differential_pressure.voltage; + calibration_counter++; + + } else if (poll_ret == 0) { + /* any poll failure for 1s is a reason to abort */ + mavlink_log_info(mavlink_fd, "airspeed calibration aborted"); + return; + } + } + + airspeed_offset = airspeed_offset / calibration_count; + + if (isfinite(airspeed_offset)) { + + if (param_set(param_find("SENS_VAIR_OFF"), &(airspeed_offset))) { + mavlink_log_critical(mavlink_fd, "Setting offs failed!"); + } + + /* auto-save to EEPROM */ + int save_ret = param_save_default(); + + if (save_ret != 0) { + warn("WARNING: auto-save of params to storage failed"); + } + + //char buf[50]; + //sprintf(buf, "[cmd] accel cal: x:%8.4f y:%8.4f z:%8.4f\n", (double)accel_offset[0], (double)accel_offset[1], (double)accel_offset[2]); + //mavlink_log_info(mavlink_fd, buf); + mavlink_log_info(mavlink_fd, "airspeed calibration done"); + + tune_confirm(); + sleep(2); + tune_confirm(); + sleep(2); + /* third beep by cal end routine */ + + } else { + mavlink_log_info(mavlink_fd, "airspeed calibration FAILED (NaN)"); + } + + /* exit airspeed calibration mode */ + status->flag_preflight_airspeed_calibration = false; + state_machine_publish(status_pub, status, mavlink_fd); + + close(sub_differential_pressure); +} + void handle_command(int status_pub, struct vehicle_status_s *current_vehicle_status, struct vehicle_command_s *cmd) @@ -980,6 +1054,28 @@ void handle_command(int status_pub, struct vehicle_status_s *current_vehicle_sta handled = true; } + /* airspeed calibration */ + if ((int)(cmd->param6) == 1) { //xxx: this is not defined by the mavlink protocol + /* transition to calibration state */ + do_state_update(status_pub, ¤t_status, mavlink_fd, SYSTEM_STATE_PREFLIGHT); + + if (current_status.state_machine == SYSTEM_STATE_PREFLIGHT) { + mavlink_log_info(mavlink_fd, "CMD starting airspeed cal"); + tune_confirm(); + do_airspeed_calibration(status_pub, ¤t_status); + tune_confirm(); + mavlink_log_info(mavlink_fd, "CMD finished airspeed cal"); + do_state_update(status_pub, ¤t_status, mavlink_fd, SYSTEM_STATE_STANDBY); + result = VEHICLE_CMD_RESULT_ACCEPTED; + + } else { + mavlink_log_critical(mavlink_fd, "REJECTING airspeed cal"); + result = VEHICLE_CMD_RESULT_DENIED; + } + + handled = true; + } + /* none found */ if (!handled) { //warnx("refusing unsupported calibration request\n"); diff --git a/apps/sensors/sensor_params.c b/apps/sensors/sensor_params.c index 9f23ebbba..a1ef9d136 100644 --- a/apps/sensors/sensor_params.c +++ b/apps/sensors/sensor_params.c @@ -64,6 +64,8 @@ PARAM_DEFINE_FLOAT(SENS_ACC_XSCALE, 1.0f); PARAM_DEFINE_FLOAT(SENS_ACC_YSCALE, 1.0f); PARAM_DEFINE_FLOAT(SENS_ACC_ZSCALE, 1.0f); +PARAM_DEFINE_FLOAT(SENS_VAIR_OFF, 2.5f); + PARAM_DEFINE_FLOAT(RC1_MIN, 1000.0f); PARAM_DEFINE_FLOAT(RC1_TRIM, 1500.0f); PARAM_DEFINE_FLOAT(RC1_MAX, 2000.0f); diff --git a/apps/sensors/sensors.cpp b/apps/sensors/sensors.cpp index c29910dcc..f77bc9b8b 100644 --- a/apps/sensors/sensors.cpp +++ b/apps/sensors/sensors.cpp @@ -187,6 +187,7 @@ private: float mag_scale[3]; float accel_offset[3]; float accel_scale[3]; + float airspeed_offset; int rc_type; @@ -235,6 +236,7 @@ private: param_t accel_scale[3]; param_t mag_offset[3]; param_t mag_scale[3]; + param_t airspeed_offset; param_t rc_map_roll; param_t rc_map_pitch; @@ -480,6 +482,9 @@ Sensors::Sensors() : _parameter_handles.mag_scale[1] = param_find("SENS_MAG_YSCALE"); _parameter_handles.mag_scale[2] = param_find("SENS_MAG_ZSCALE"); + /*Airspeed offset */ + _parameter_handles.airspeed_offset = param_find("SENS_VAIR_OFF"); + _parameter_handles.battery_voltage_scaling = param_find("BAT_V_SCALING"); /* fetch initial parameter values */ @@ -687,6 +692,9 @@ Sensors::parameters_update() param_get(_parameter_handles.mag_scale[1], &(_parameters.mag_scale[1])); param_get(_parameter_handles.mag_scale[2], &(_parameters.mag_scale[2])); + /* Airspeed offset */ + param_get(_parameter_handles.airspeed_offset, &(_parameters.airspeed_offset)); + /* scaling of ADC ticks to battery voltage */ if (param_get(_parameter_handles.battery_voltage_scaling, &(_parameters.battery_voltage_scaling)) != OK) { warnx("Failed updating voltage scaling param"); @@ -1036,7 +1044,7 @@ Sensors::adc_poll(struct sensor_combined_s &raw) // float pres_raw = fabsf(voltage - (3.3f / 2.0f)); // float pres_mbar = pres_raw * (3.3f / 5.0f) * 10.0f; //XXX depends on sensor used..., where are the above numbers from? - float diff_pres_pa = fabsf(voltage - 2.5f) * 1000.0f; //for MPXV7002DP //xxx: need an offset calibration + float diff_pres_pa = (voltage - _parameters.airspeed_offset) * 1000.0f; //for MPXV7002DP float airspeed_true = calc_true_airspeed(diff_pres_pa + _barometer.pressure*1e2f, _barometer.pressure*1e2f, _barometer.temperature - 5.0f); //factor 1e2 for conversion from mBar to Pa @@ -1045,7 +1053,7 @@ Sensors::adc_poll(struct sensor_combined_s &raw) float airspeed_indicated = calc_indicated_airspeed(diff_pres_pa); - //printf("voltage: %.4f, diff_pres_pa %.4f, v_ind %.4f, v_true %.4f\n", (double)voltage, (double)diff_pres_pa, (double)airspeed_indicated, (double)airspeed_true); + //printf("voltage: %.4f, diff_pres_pa %.4f, baro press %.4f Pa, v_ind %.4f, v_true %.4f\n", (double)voltage, (double)diff_pres_pa, (double)_barometer.pressure*1e2f, (double)airspeed_indicated, (double)airspeed_true); _differential_pressure.timestamp = hrt_absolute_time(); _differential_pressure.static_pressure_mbar = _barometer.pressure; @@ -1053,6 +1061,7 @@ Sensors::adc_poll(struct sensor_combined_s &raw) _differential_pressure.temperature_celcius = _barometer.temperature; _differential_pressure.indicated_airspeed_m_s = airspeed_indicated; _differential_pressure.true_airspeed_m_s = airspeed_true; + _differential_pressure.voltage = voltage; /* announce the airspeed if needed, just publish else */ if (_airspeed_pub > 0) { diff --git a/apps/systemlib/airspeed.c b/apps/systemlib/airspeed.c index 32943b2f5..382df2ee4 100644 --- a/apps/systemlib/airspeed.c +++ b/apps/systemlib/airspeed.c @@ -58,7 +58,13 @@ */ float calc_indicated_airspeed(float differential_pressure) { - return sqrtf((2.0f*differential_pressure) / CONSTANTS_AIR_DENSITY_SEA_LEVEL_15C); + + if (differential_pressure > 0) { + return sqrtf((2.0f*differential_pressure) / CONSTANTS_AIR_DENSITY_SEA_LEVEL_15C); + } else { + return -sqrtf((2.0f*fabs(differential_pressure)) / CONSTANTS_AIR_DENSITY_SEA_LEVEL_15C); + } + } /** @@ -89,9 +95,17 @@ float calc_true_airspeed_from_indicated(float speed_indicated, float pressure_am float calc_true_airspeed(float total_pressure, float static_pressure, float temperature_celsius) { float density = get_air_density(static_pressure, temperature_celsius); - if (density < 0.0001f || isnan(density)) { + if (density < 0.0001f || !isfinite(density)) { density = CONSTANTS_AIR_DENSITY_SEA_LEVEL_15C; printf("Invalid air density, using density at sea level\n"); } - return sqrtf((2.0f*(total_pressure - static_pressure)) / density); + + float pressure_difference = total_pressure - static_pressure; + + if(pressure_difference > 0) { + return sqrtf((2.0f*(pressure_difference)) / density); + } else + { + return -sqrtf((2.0f*fabs(pressure_difference)) / density); + } } diff --git a/apps/uORB/topics/differential_pressure.h b/apps/uORB/topics/differential_pressure.h index 78a37fdf4..d5e4bf37e 100644 --- a/apps/uORB/topics/differential_pressure.h +++ b/apps/uORB/topics/differential_pressure.h @@ -52,12 +52,13 @@ * Differential pressure and airspeed */ struct differential_pressure_s { - uint64_t timestamp; /**< microseconds since system boot, needed to integrate */ + uint64_t timestamp; /**< microseconds since system boot, needed to integrate */ float static_pressure_mbar; /**< Static / environment pressure */ float differential_pressure_mbar; /**< Differential pressure reading */ float temperature_celcius; /**< ambient temperature in celcius, -1 if unknown */ float indicated_airspeed_m_s; /**< indicated airspeed in meters per second, -1 if unknown */ - float true_airspeed_m_s; /**< true airspeed in meters per second, -1 if unknown */ + float true_airspeed_m_s; /**< true airspeed in meters per second, -1 if unknown */ + float voltage; /**< Voltage from the airspeed sensor (voltage divider already compensated) */ }; /** diff --git a/apps/uORB/topics/vehicle_status.h b/apps/uORB/topics/vehicle_status.h index 06b4c5ca5..ae18ba050 100644 --- a/apps/uORB/topics/vehicle_status.h +++ b/apps/uORB/topics/vehicle_status.h @@ -173,6 +173,7 @@ struct vehicle_status_s bool flag_preflight_gyro_calibration; /**< true if gyro calibration is requested */ bool flag_preflight_mag_calibration; /**< true if mag calibration is requested */ bool flag_preflight_accel_calibration; + bool flag_preflight_airspeed_calibration; bool rc_signal_found_once; bool rc_signal_lost; /**< true if RC reception is terminally lost */ |