ALPAKA/driver-ms56xx
1
0
Fork 0
mirror of https://git.intern.spaceteamaachen.de/ALPAKA/driver-ms56xx.git synced 2025-06-09 17:46:00 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Changes to make use of previous temperature measurements

Browse Source
This commit is contained in:
dario 2024-04-28 10:56:42 +02:00
parent e96fae6f97
commit 7505f04558
2 changed files with 25 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/sta/drivers/MS56xx.hpp
View File

@ -119,9 +119,10 @@ namespace sta
* @brief Reads the current pressure value from the sensor. Obtains the temperature value from the interal sensor.
*
* @param unit Specifies the unit for the pressure measurement. Default is hPa.
* @param cachedTemp Specifies if a cached temperature value should be used.
* @return int32_t The measured value in the specified unit.
*/
float getPressure(Unit unit = Unit::hPa);
float getPressure(Unit unit = Unit::hPa, bool cachedTemp = false);
/**
* @brief Reads the current temperature value from the sensor.
@ -129,7 +130,7 @@ namespace sta
* @return int32_t The measured temperature.
* @note There are better sensors for temperature measurements than the MS56xx.
*/
int32_t getTemperature();
float getTemperature();
/**
* @brief Provide a reference pressure value at a reference altitude in order to estimate the sealevel pressure.
@ -216,6 +217,8 @@ namespace sta
OsrLevel osr_;
Intf intf_;
float dT_;
// Pressure at sealevel. Use the standard atmosphere per default.
float sealevel_ = 1013.25;
@ -227,4 +230,4 @@ namespace sta
};
}
#endif // ifndef STA_SENSORS_MS5607_HPP
#endif // ifndef STA_SENSORS_MS5607_HPP

54
src/MS56xx.cpp
View File

@ -53,7 +53,7 @@ namespace sta
delay_(MS56xx::RESET_DELAY);
}
float MS56xx::getPressure(Unit unit /* = Unit::hPa */)
float MS56xx::getPressure(Unit unit /* = Unit::hPa */, bool cachedTemp /* = false */)
{
// Request the ADC to read pressure values.
busCommand(MS56xx::Operations::D1_CONVERSION + 2*this->osr_);
@ -66,39 +66,23 @@ namespace sta
uint32_t D1 = 0x00 | buffer[0] << 16 | buffer[1] << 8 | buffer[2];
// 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());
busRead(MS56xx::Operations::ADC_RESULT, buffer, 3);
uint32_t D2 = buffer[0] << 16 | buffer[1] << 8 | buffer[2];
float dT = D2 - C_[5];
float offset = C_[2] + dT * C_[4];
float sens = C_[1] + dT * C_[3];
/*
if (temperature < 2000)
if (!cachedTemp)
{
float T2 = dT * dT * 4.6566128731E-10;
float t = (temperature - 2000) * (temperature - 2000);
float offset2 = 2.5 * t;
float sens2 = 1.25 * t;
// COMMENT OUT < -1500 CORRECTION IF NOT NEEDED
if (temperature < -1500)
{
t = (temperature + 1500) * (temperature + 1500);
offset2 += 7 * t;
sens2 += 5.5 * t;
}
temperature -= T2;
offset -= offset2;
sens -= sens2;
// 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());
busRead(MS56xx::Operations::ADC_RESULT, buffer, 3);
uint32_t D2 = buffer[0] << 16 | buffer[1] << 8 | buffer[2];
dT_ = D2 - C_[5];
}
*/
float offset = C_[2] + dT_ * C_[4];
float sens = C_[1] + dT_ * C_[3];
// The pressure in Pa.
float pressure = (D1 * sens * 4.76837158205E-7 - offset) * 3.051757813E-5;
@ -107,7 +91,7 @@ namespace sta
return pressure * 0.01;
}
int32_t MS56xx::getTemperature()
float MS56xx::getTemperature()
{
// Request the ADC to read temperature values.
busCommand(MS56xx::Operations::D2_CONVERSION + 2*this->osr_);
@ -120,8 +104,8 @@ namespace sta
uint32_t D2 = buffer[0] << 16 | buffer[1] << 8 | buffer[2];
float dT = D2 - C_[5];
float temperature = 2000 + dT * C_[6];
dT_ = D2 - C_[5];
float temperature = 2000 + dT_ * C_[6];
return temperature * 0.01;
}