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Code Issues Wiki Activity

Pitot Tube:Rename and Add Macros

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This commit is contained in:
JuliooCesarMDM 2022-05-07 14:13:43 -03:00
parent b13525dbb3
commit c02b172b46
5 changed files with 11 additions and 9 deletions
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6
src/main/common/maths.h
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@ -68,6 +68,12 @@
#define C_TO_KELVIN(temp) (temp + 273.15f)
// Standard Sea Level values
// Ref:https://en.wikipedia.org/wiki/Standard_sea_level
#define SSL_AIR_DENSITY 1.225f // kg/m^3
#define SSL_AIR_PRESSURE 101325.01576f // Pascal
#define SSL_AIR_TEMPERATURE 288.15f // K
// copied from https://code.google.com/p/cxutil/source/browse/include/cxutil/utility.h#70
#define _CHOOSE2(binoper, lexpr, lvar, rexpr, rvar) \
( __extension__ ({ \

2
src/main/drivers/pitotmeter/pitotmeter_adc.c
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@ -59,7 +59,7 @@ static void adcPitotCalculate(pitotDev_t *pitot, float *pressure, float *tempera
if (pressure)
*pressure = (voltage * PITOT_ADC_VOLTAGE_SCALER - PITOT_ADC_VOLTAGE_ZERO) * PITOT_ADC_VOLTAGE_TO_PRESSURE;
if (temperature)
*temperature = 288.15f; // Temperature at standard sea level (288.15 K)
*temperature = SSL_AIR_TEMPERATURE; // Temperature at standard sea level
}
bool adcPitotDetect(pitotDev_t *pitot)

5
src/main/drivers/pitotmeter/pitotmeter_virtual.c
View file

@ -74,10 +74,9 @@ static void virtualPitotCalculate(pitotDev_t *pitot, float *pressure, float *tem
}
}
if (pressure)
//*pressure = sq(airSpeed / 100) * AIR_DENSITY_SEA_LEVEL_15C / 2 + P0;
*pressure = sq(airSpeed) * AIR_DENSITY_SEA_LEVEL_15C / 20000.0f + P0;
*pressure = sq(airSpeed) * SSL_AIR_DENSITY / 20000.0f + SSL_AIR_PRESSURE;
if (temperature)
*temperature = 288.15f; // Temperature at standard sea level (288.15 K)
*temperature = SSL_AIR_TEMPERATURE; // Temperature at standard sea level
}
bool virtualPitotDetect(pitotDev_t *pitot)

4
src/main/sensors/pitotmeter.c
View file

@ -167,7 +167,7 @@ bool pitotIsCalibrationComplete(void)
void pitotStartCalibration(void)
{
zeroCalibrationStartS(&pitot.zeroCalibration, CALIBRATING_PITOT_TIME_MS, P0 * 0.00001f, false);
zeroCalibrationStartS(&pitot.zeroCalibration, CALIBRATING_PITOT_TIME_MS, SSL_AIR_PRESSURE * 0.00001f, false);
}
static void performPitotCalibrationCycle(void)
@ -223,7 +223,7 @@ STATIC_PROTOTHREAD(pitotThread)
//
// Therefore we shouldn't care about CAS/TAS and only calculate IAS since it's more indicative to the pilot and more useful in calculations
// It also allows us to use pitot_scale to calibrate the dynamic pressure sensor scale
pitot.airSpeed = pitotmeterConfig()->pitot_scale * fast_fsqrtf(2.0f * fabsf(pitot.pressure - pitot.pressureZero) / AIR_DENSITY_SEA_LEVEL_15C) * 100;
pitot.airSpeed = pitotmeterConfig()->pitot_scale * fast_fsqrtf(2.0f * fabsf(pitot.pressure - pitot.pressureZero) / SSL_AIR_DENSITY) * 100;
} else {
performPitotCalibrationCycle();
pitot.airSpeed = 0;

3
src/main/sensors/pitotmeter.h
View file

@ -59,9 +59,6 @@ typedef struct pito_s {
#ifdef USE_PITOT
#define AIR_DENSITY_SEA_LEVEL_15C 1.225f // Air density at sea level and 15 degrees Celsius
#define P0 101325.0f // standard pressure [Pa]
extern pitot_t pitot;
bool pitotInit(void);