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Barometer.ino
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Barometer.ino
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#include "./Barometer.h"
Barometer_t barometer;
float readTemperature();
float readPressure();
void readCoefficients(void);
void write8(byte reg, byte value);
uint8_t read8(byte reg);
uint16_t read16(byte reg);
uint32_t read24(byte reg);
// int16_t readS16(byte reg);
uint16_t read16_LE(byte reg);
int16_t readS16_LE(byte reg);
void setSampling(sensor_mode mode = MODE_NORMAL,
sensor_sampling tempSampling = SAMPLING_X16,
sensor_sampling pressSampling = SAMPLING_X16,
sensor_filter filter = FILTER_OFF,
standby_duration duration = STANDBY_MS_1);
void BMP_Init() {
// Wire.begin();はされている前提!
barometer.pressure = 0.0;
barometer.temperature = 0.0;
uint8_t chipid = BMP280_CHIPID;
if (read8(BMP280_REGISTER_CHIPID) != chipid) {
Serial.println(F("Could not find a valid BMP280 sensor, check wiring!"));
while (1) delay(10);
}
readCoefficients();
// write8(BMP280_REGISTER_CONTROL, 0x3F); /* needed? */
// setSampling();
/* Default settings from datasheet. */
setSampling(MODE_NORMAL, /* Operating Mode. */
SAMPLING_X2, /* Temp. oversampling */
SAMPLING_X16, /* Pressure oversampling */
FILTER_X16, /* Filtering. */
STANDBY_MS_500); /* Standby time. */
delay(100);
}
void BMP_Update() {
int32_t t_fine;
// 温度と t_fine の更新
{
int32_t var1, var2;
int32_t adc_T = read24(BMP280_REGISTER_TEMPDATA);
adc_T >>= 4;
var1 = ((((adc_T >> 3) - ((int32_t)barometer._bmp280_calib.dig_T1 << 1))) *
((int32_t)barometer._bmp280_calib.dig_T2)) >>
11;
var2 = (((((adc_T >> 4) - ((int32_t)barometer._bmp280_calib.dig_T1)) *
((adc_T >> 4) - ((int32_t)barometer._bmp280_calib.dig_T1))) >>
12) *
((int32_t)barometer._bmp280_calib.dig_T3)) >>
14;
t_fine = var1 + var2;
barometer.temperature = (t_fine * 5 + 128) >> 8;
barometer.temperature = barometer.temperature / 100.0;
}
// 圧力の更新
{
int64_t var1, var2, p;
int32_t adc_P = read24(BMP280_REGISTER_PRESSUREDATA);
adc_P >>= 4;
var1 = ((int64_t)t_fine) - 128000;
var2 = var1 * var1 * (int64_t)barometer._bmp280_calib.dig_P6;
var2 = var2 + ((var1 * (int64_t)barometer._bmp280_calib.dig_P5) << 17);
var2 = var2 + (((int64_t)barometer._bmp280_calib.dig_P4) << 35);
var1 = ((var1 * var1 * (int64_t)barometer._bmp280_calib.dig_P3) >> 8) +
((var1 * (int64_t)barometer._bmp280_calib.dig_P2) << 12);
var1 =
(((((int64_t)1) << 47) + var1)) * ((int64_t)barometer._bmp280_calib.dig_P1) >> 33;
if (var1 == 0) {
barometer.pressure = 0; // avoid exception caused by division by zero
return;
}
p = 1048576 - adc_P;
p = (((p << 31) - var2) * 3125) / var1;
var1 = (((int64_t)barometer._bmp280_calib.dig_P9) * (p >> 13) * (p >> 13)) >> 25;
var2 = (((int64_t)barometer._bmp280_calib.dig_P8) * p) >> 19;
p = ((p + var1 + var2) >> 8) + (((int64_t)barometer._bmp280_calib.dig_P7) << 4);
barometer.pressure = (float)p / 256.0;
}
}
void BMP_Print() {
Serial.print(F("Temp="));
Serial.println(barometer.temperature);
Serial.print(F("Pres="));
Serial.println(barometer.pressure);
}
float BMP_GetPressure() {
return barometer.pressure;
}
float BMP_GetTemperature() {
return barometer.temperature;
}
void write8(byte reg, byte value) {
Wire.beginTransmission((uint8_t)BMP280_ADDRESS);
Wire.write((uint8_t)reg);
Wire.write((uint8_t)value);
Wire.endTransmission();
}
/*!
* @brief Reads an 8 bit value over I2C/SPI
* @param reg
* selected register
* @return value from selected register
*/
uint8_t read8(byte reg) {
uint8_t value;
Wire.beginTransmission((uint8_t)BMP280_ADDRESS);
Wire.write((uint8_t)reg);
Wire.endTransmission();
Wire.requestFrom((uint8_t)BMP280_ADDRESS, (byte)1);
value = Wire.read();
return value;
}
/*!
* @brief Reads a 16 bit value over I2C/SPI
*/
uint16_t read16(byte reg) {
uint16_t value;
Wire.beginTransmission((uint8_t)BMP280_ADDRESS);
Wire.write((uint8_t)reg);
Wire.endTransmission();
Wire.requestFrom((uint8_t)BMP280_ADDRESS, (byte)2);
value = (Wire.read() << 8) | Wire.read();
return value;
}
uint16_t read16_LE(byte reg) {
uint16_t temp = read16(reg);
return (temp >> 8) | (temp << 8);
}
/*!
* @brief Reads a signed 16 bit value over I2C/SPI
*/
// int16_t readS16(byte reg) { return (int16_t)read16(reg); }
int16_t readS16_LE(byte reg) {
return (int16_t)read16_LE(reg);
}
/*!
* @brief Reads a 24 bit value over I2C/SPI
*/
uint32_t read24(byte reg) {
uint32_t value;
Wire.beginTransmission((uint8_t)BMP280_ADDRESS);
Wire.write((uint8_t)reg);
Wire.endTransmission();
Wire.requestFrom((uint8_t)BMP280_ADDRESS, (byte)3);
value = Wire.read();
value <<= 8;
value |= Wire.read();
value <<= 8;
value |= Wire.read();
return value;
}
/*!
* @brief Reads the factory-set coefficients
*/
void readCoefficients() {
barometer._bmp280_calib.dig_T1 = read16_LE(BMP280_REGISTER_DIG_T1);
barometer._bmp280_calib.dig_T2 = readS16_LE(BMP280_REGISTER_DIG_T2);
barometer._bmp280_calib.dig_T3 = readS16_LE(BMP280_REGISTER_DIG_T3);
barometer._bmp280_calib.dig_P1 = read16_LE(BMP280_REGISTER_DIG_P1);
barometer._bmp280_calib.dig_P2 = readS16_LE(BMP280_REGISTER_DIG_P2);
barometer._bmp280_calib.dig_P3 = readS16_LE(BMP280_REGISTER_DIG_P3);
barometer._bmp280_calib.dig_P4 = readS16_LE(BMP280_REGISTER_DIG_P4);
barometer._bmp280_calib.dig_P5 = readS16_LE(BMP280_REGISTER_DIG_P5);
barometer._bmp280_calib.dig_P6 = readS16_LE(BMP280_REGISTER_DIG_P6);
barometer._bmp280_calib.dig_P7 = readS16_LE(BMP280_REGISTER_DIG_P7);
barometer._bmp280_calib.dig_P8 = readS16_LE(BMP280_REGISTER_DIG_P8);
barometer._bmp280_calib.dig_P9 = readS16_LE(BMP280_REGISTER_DIG_P9);
}
void setSampling(sensor_mode mode,
sensor_sampling tempSampling,
sensor_sampling pressSampling,
sensor_filter filter,
standby_duration duration) {
barometer._measReg.mode = mode;
barometer._measReg.osrs_t = tempSampling;
barometer._measReg.osrs_p = pressSampling;
barometer._configReg.filter = filter;
barometer._configReg.t_sb = duration;
write8(BMP280_REGISTER_CONFIG, barometer._configReg.get());
write8(BMP280_REGISTER_CONTROL, barometer._measReg.get());
}