diff options
author | Lorenz Meier <lm@inf.ethz.ch> | 2013-05-09 15:58:23 +0200 |
---|---|---|
committer | Lorenz Meier <lm@inf.ethz.ch> | 2013-05-09 15:58:23 +0200 |
commit | 614bbb15109236c353c02b1d2c2494bc442a699f (patch) | |
tree | e661f535b281c8131c4925a9023254e5ae1d8a2d /src/modules/sensors/sensors.cpp | |
parent | 3152dae3dca9f6104e685fc27da0aba7c09ac3ca (diff) | |
parent | 5b60991c63b0c6b87632369fde73236263670448 (diff) | |
download | px4-firmware-614bbb15109236c353c02b1d2c2494bc442a699f.tar.gz px4-firmware-614bbb15109236c353c02b1d2c2494bc442a699f.tar.bz2 px4-firmware-614bbb15109236c353c02b1d2c2494bc442a699f.zip |
Merged ETS airspeed driver
Diffstat (limited to 'src/modules/sensors/sensors.cpp')
-rw-r--r-- | src/modules/sensors/sensors.cpp | 89 |
1 files changed, 63 insertions, 26 deletions
diff --git a/src/modules/sensors/sensors.cpp b/src/modules/sensors/sensors.cpp index 123bbb120..6b6aeedee 100644 --- a/src/modules/sensors/sensors.cpp +++ b/src/modules/sensors/sensors.cpp @@ -77,6 +77,7 @@ #include <uORB/topics/parameter_update.h> #include <uORB/topics/battery_status.h> #include <uORB/topics/differential_pressure.h> +#include <uORB/topics/airspeed.h> #define GYRO_HEALTH_COUNTER_LIMIT_ERROR 20 /* 40 ms downtime at 500 Hz update rate */ #define ACC_HEALTH_COUNTER_LIMIT_ERROR 20 /* 40 ms downtime at 500 Hz update rate */ @@ -98,6 +99,12 @@ #define BAT_VOL_LOWPASS_2 0.01f #define VOLTAGE_BATTERY_IGNORE_THRESHOLD_VOLTS 3.5f +/** + * HACK - true temperature is much less than indicated temperature in baro, + * subtract 5 degrees in an attempt to account for the electrical upheating of the PCB + */ +#define PCB_TEMP_ESTIMATE_DEG 5.0f + #define PPM_INPUT_TIMEOUT_INTERVAL 50000 /**< 50 ms timeout / 20 Hz */ #define limit_minus_one_to_one(arg) (arg < -1.0f) ? -1.0f : ((arg > 1.0f) ? 1.0f : arg) @@ -156,6 +163,8 @@ private: int _mag_sub; /**< raw mag data subscription */ int _rc_sub; /**< raw rc channels data subscription */ int _baro_sub; /**< raw baro data subscription */ + int _airspeed_sub; /**< airspeed subscription */ + int _diff_pres_sub; /**< raw differential pressure subscription */ int _vstatus_sub; /**< vehicle status subscription */ int _params_sub; /**< notification of parameter updates */ int _manual_control_sub; /**< notification of manual control updates */ @@ -165,13 +174,15 @@ private: orb_advert_t _rc_pub; /**< raw r/c control topic */ orb_advert_t _battery_pub; /**< battery status */ orb_advert_t _airspeed_pub; /**< airspeed */ + orb_advert_t _diff_pres_pub; /**< differential_pressure */ perf_counter_t _loop_perf; /**< loop performance counter */ struct rc_channels_s _rc; /**< r/c channel data */ struct battery_status_s _battery_status; /**< battery status */ struct baro_report _barometer; /**< barometer data */ - struct differential_pressure_s _differential_pressure; + struct differential_pressure_s _diff_pres; + struct airspeed_s _airspeed; struct { float min[_rc_max_chan_count]; @@ -187,7 +198,7 @@ private: float mag_scale[3]; float accel_offset[3]; float accel_scale[3]; - float airspeed_offset; + int diff_pres_offset_pa; int rc_type; @@ -236,7 +247,7 @@ private: param_t accel_scale[3]; param_t mag_offset[3]; param_t mag_scale[3]; - param_t airspeed_offset; + param_t diff_pres_offset_pa; param_t rc_map_roll; param_t rc_map_pitch; @@ -331,6 +342,14 @@ private: void baro_poll(struct sensor_combined_s &raw); /** + * Poll the differential pressure sensor for updated data. + * + * @param raw Combined sensor data structure into which + * data should be returned. + */ + void diff_pres_poll(struct sensor_combined_s &raw); + + /** * Check for changes in vehicle status. */ void vehicle_status_poll(); @@ -400,6 +419,7 @@ Sensors::Sensors() : _rc_pub(-1), _battery_pub(-1), _airspeed_pub(-1), + _diff_pres_pub(-1), /* performance counters */ _loop_perf(perf_alloc(PC_ELAPSED, "sensor task update")) @@ -484,8 +504,8 @@ 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"); + /* Differential pressure offset */ + _parameter_handles.diff_pres_offset_pa = param_find("SENS_DPRES_OFF"); _parameter_handles.battery_voltage_scaling = param_find("BAT_V_SCALING"); @@ -695,7 +715,7 @@ Sensors::parameters_update() param_get(_parameter_handles.mag_scale[2], &(_parameters.mag_scale[2])); /* Airspeed offset */ - param_get(_parameter_handles.airspeed_offset, &(_parameters.airspeed_offset)); + param_get(_parameter_handles.diff_pres_offset_pa, &(_parameters.diff_pres_offset_pa)); /* scaling of ADC ticks to battery voltage */ if (param_get(_parameter_handles.battery_voltage_scaling, &(_parameters.battery_voltage_scaling)) != OK) { @@ -890,6 +910,32 @@ Sensors::baro_poll(struct sensor_combined_s &raw) } void +Sensors::diff_pres_poll(struct sensor_combined_s &raw) +{ + bool updated; + orb_check(_diff_pres_sub, &updated); + + if (updated) { + orb_copy(ORB_ID(differential_pressure), _diff_pres_sub, &_diff_pres); + + raw.differential_pressure_pa = _diff_pres.differential_pressure_pa; + raw.differential_pressure_counter++; + + _airspeed.indicated_airspeed_m_s = calc_indicated_airspeed(_diff_pres.differential_pressure_pa); + _airspeed.true_airspeed_m_s = calc_true_airspeed(_diff_pres.differential_pressure_pa + raw.baro_pres_mbar*1e2f, + raw.baro_pres_mbar*1e2f, raw.baro_temp_celcius - PCB_TEMP_ESTIMATE_DEG); + + /* announce the airspeed if needed, just publish else */ + if (_airspeed_pub > 0) { + orb_publish(ORB_ID(airspeed), _airspeed_pub, &_airspeed); + + } else { + _airspeed_pub = orb_advertise(ORB_ID(airspeed), &_airspeed); + } + } +} + +void Sensors::vehicle_status_poll() { struct vehicle_status_s vstatus; @@ -1047,31 +1093,18 @@ Sensors::adc_poll(struct sensor_combined_s &raw) */ if (voltage > 0.4f) { - float diff_pres_pa = (voltage - _parameters.airspeed_offset) * 1000.0f; //for MPXV7002DP sensor - - 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 - // XXX HACK - true temperature is much less than indicated temperature in baro, - // subtract 5 degrees in an attempt to account for the electrical upheating of the PCB + float diff_pres_pa = voltage * 1000.0f - _parameters.diff_pres_offset_pa; //for MPXV7002DP sensor - float airspeed_indicated = calc_indicated_airspeed(diff_pres_pa); - - //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; - _differential_pressure.differential_pressure_mbar = diff_pres_pa*1e-2f; - _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; + _diff_pres.timestamp = hrt_absolute_time(); + _diff_pres.differential_pressure_pa = diff_pres_pa; + _diff_pres.voltage = voltage; /* announce the airspeed if needed, just publish else */ - if (_airspeed_pub > 0) { - orb_publish(ORB_ID(differential_pressure), _airspeed_pub, &_differential_pressure); + if (_diff_pres_pub > 0) { + orb_publish(ORB_ID(differential_pressure), _diff_pres_pub, &_diff_pres); } else { - _airspeed_pub = orb_advertise(ORB_ID(differential_pressure), &_differential_pressure); + _diff_pres_pub = orb_advertise(ORB_ID(differential_pressure), &_diff_pres); } } } @@ -1310,6 +1343,7 @@ Sensors::task_main() _mag_sub = orb_subscribe(ORB_ID(sensor_mag)); _rc_sub = orb_subscribe(ORB_ID(input_rc)); _baro_sub = orb_subscribe(ORB_ID(sensor_baro)); + _diff_pres_sub = orb_subscribe(ORB_ID(differential_pressure)); _vstatus_sub = orb_subscribe(ORB_ID(vehicle_status)); _params_sub = orb_subscribe(ORB_ID(parameter_update)); _manual_control_sub = orb_subscribe(ORB_ID(manual_control_setpoint)); @@ -1336,6 +1370,7 @@ Sensors::task_main() gyro_poll(raw); mag_poll(raw); baro_poll(raw); + diff_pres_poll(raw); parameter_update_poll(true /* forced */); @@ -1384,6 +1419,8 @@ Sensors::task_main() /* check battery voltage */ adc_poll(raw); + diff_pres_poll(raw); + /* Inform other processes that new data is available to copy */ if (_publishing) orb_publish(ORB_ID(sensor_combined), _sensor_pub, &raw); |