ALPAKA/driver-ms56xx
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Fixed conversion maths

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This commit is contained in:
dario 2024-04-20 16:03:49 +02:00
parent 5519e3664a
commit e96fae6f97
2 changed files with 31 additions and 25 deletions
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2
include/sta/drivers/MS56xx.hpp
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@ -165,7 +165,7 @@ namespace sta
* @note This code was taken from https://github.com/RobTillaart/MS5611
*
*/
void initConstants(bool mathMode = 0);
void initConstants();
/**
* @brief Convert the pressure value given in Pa to a different unit.

54
src/MS56xx.cpp
View File

@ -55,7 +55,7 @@ namespace sta
float MS56xx::getPressure(Unit unit /* = Unit::hPa */)
{
// Request the ADC to read temperature values.
// Request the ADC to read pressure values.
busCommand(MS56xx::Operations::D1_CONVERSION + 2*this->osr_);
// 8.22 ms conversion according to the datasheet.
@ -64,10 +64,9 @@ namespace sta
uint8_t buffer[3] = { 0x00, 0x00, 0x00 };
busRead(MS56xx::Operations::ADC_RESULT, buffer, 3);
// Difference between actual and reference temperature.
uint32_t D1 = buffer[0] << 16 | buffer[1] << 8 | buffer[2];
uint32_t D1 = 0x00 | buffer[0] << 16 | buffer[1] << 8 | buffer[2];
// Request the ADC to read pressure values.
// Request the ADC to read temperature values.
busCommand(MS56xx::Operations::D2_CONVERSION + 2*this->osr_);
// 8.22 ms conversion according to the datasheet.
@ -78,11 +77,10 @@ namespace sta
uint32_t D2 = buffer[0] << 16 | buffer[1] << 8 | buffer[2];
float dT = D2 - C_[5];
float temperature = 2000 + dT * C_[6];
float offset = C_[2] + dT * C_[4];
float sens = C_[1] + dT * C_[3];
/*
if (temperature < 2000)
{
float T2 = dT * dT * 4.6566128731E-10;
@ -100,6 +98,7 @@ namespace sta
offset -= offset2;
sens -= sens2;
}
*/
// The pressure in Pa.
float pressure = (D1 * sens * 4.76837158205E-7 - offset) * 3.051757813E-5;
@ -108,8 +107,23 @@ namespace sta
return pressure * 0.01;
}
int32_t MS56xx::getTemperature() {
return 21.0f;
int32_t MS56xx::getTemperature()
{
// Request the ADC to read temperature values.
busCommand(MS56xx::Operations::D2_CONVERSION + 2*this->osr_);
// 8.22 ms conversion according to the datasheet.
delay_(osrDelay());
uint8_t buffer[3] = { 0x00, 0x00, 0x00 };
busRead(MS56xx::Operations::ADC_RESULT, buffer, 3);
uint32_t D2 = buffer[0] << 16 | buffer[1] << 8 | buffer[2];
float dT = D2 - C_[5];
float temperature = 2000 + dT * C_[6];
return temperature * 0.01;
}
void MS56xx::setPressureReference(float pressRef, float altRef, Unit unit /* = Unit::hPa */)
@ -139,23 +153,15 @@ namespace sta
}
}
void MS56xx::initConstants(bool mathMode /* = 0 */)
void MS56xx::initConstants()
{
C_[0] = 1;
C_[1] = 32768L; // SENSt1 = C[1] * 2^15 | * 2^16
C_[2] = 65536L; // OFFt1 = C[2] * 2^16 | * 2^17
C_[3] = 3.90625E-3; // TCS = C[3] / 2^8 | / 2^7
C_[4] = 7.8125E-3; // TCO = C[4] / 2^7 | / 2^6
C_[5] = 256; // Tref = C[5] * 2^8 | * 2^8
C_[6] = 1.1920928955E-7; // TEMPSENS = C[6] / 2^23 | / 2^23
if (mathMode == 1) // Appnote version for pressure.
{
C_[1] = 65536L; // SENSt1
C_[2] = 131072L; // OFFt1
C_[3] = 7.8125E-3; // TCS
C_[4] = 1.5625e-2; // TCO
}
C_[1] = 65536L;
C_[2] = 131072;
C_[3] = 7.8125E-3;
C_[4] = 0.015625;
C_[5] = 256;
C_[6] = 1.1920928955E-7;
}
inline float MS56xx::convertPressure(float pressure, Unit unit)
@ -215,4 +221,4 @@ namespace sta
return true;
}
}
}