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Perform burst reads for pressure, temperature and humidity #10

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Mar 23, 2018
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Perform burst reads for pressure, temperature and humidity #10

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12 changes: 9 additions & 3 deletions src/SparkFunBME280.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -168,7 +168,9 @@ float BME280::readFloatPressure( void )

// Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24 integer bits and 8 fractional bits).
// Output value of “24674867” represents 24674867/256 = 96386.2 Pa = 963.862 hPa
int32_t adc_P = ((uint32_t)readRegister(BME280_PRESSURE_MSB_REG) << 12) | ((uint32_t)readRegister(BME280_PRESSURE_LSB_REG) << 4) | ((readRegister(BME280_PRESSURE_XLSB_REG) >> 4) & 0x0F);
uint8_t buffer[3];
readRegisterRegion(buffer, BME280_PRESSURE_MSB_REG, 3);
int32_t adc_P = ((uint32_t)buffer[0] << 12) | ((uint32_t)buffer[1] << 4) | ((buffer[2] >> 4) & 0x0F);

int64_t var1, var2, p_acc;
var1 = ((int64_t)t_fine) - 128000;
Expand Down Expand Up @@ -219,7 +221,9 @@ float BME280::readFloatHumidity( void )

// Returns humidity in %RH as unsigned 32 bit integer in Q22. 10 format (22 integer and 10 fractional bits).
// Output value of “47445” represents 47445/1024 = 46. 333 %RH
int32_t adc_H = ((uint32_t)readRegister(BME280_HUMIDITY_MSB_REG) << 8) | ((uint32_t)readRegister(BME280_HUMIDITY_LSB_REG));
uint8_t buffer[2];
readRegisterRegion(buffer, BME280_HUMIDITY_MSB_REG, 2);
int32_t adc_H = ((uint32_t)buffer[0] << 8) | ((uint32_t)buffer[1]);

int32_t var1;
var1 = (t_fine - ((int32_t)76800));
Expand Down Expand Up @@ -248,7 +252,9 @@ float BME280::readTempC( void )
// t_fine carries fine temperature as global value

//get the reading (adc_T);
int32_t adc_T = ((uint32_t)readRegister(BME280_TEMPERATURE_MSB_REG) << 12) | ((uint32_t)readRegister(BME280_TEMPERATURE_LSB_REG) << 4) | ((readRegister(BME280_TEMPERATURE_XLSB_REG) >> 4) & 0x0F);
uint8_t buffer[3];
readRegisterRegion(buffer, BME280_TEMPERATURE_MSB_REG, 3);
int32_t adc_T = ((uint32_t)buffer[0] << 12) | ((uint32_t)buffer[1] << 4) | ((buffer[2] >> 4) & 0x0F);

//By datasheet, calibrate
int64_t var1, var2;
Expand Down