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BME280_t.h
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BME280_t.h
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//based on:
// Adafruit Adafruit_BME280_Library
// https://github.com/adafruit/Adafruit_BME280_Library
//and
// Astuder BMP085-template-library-Energia
// https://github.com/astuder/BMP085-template-library-Energia
//plus code for altitude and relative pressure
//by r7
#ifndef BME280_T_h
#define BME280_T_h
#include <inttypes.h>
#include <Arduino.h>
//---------------------I2C ADDRESS---------------------------------------------------
#define BME280_ADDRESS (0x76)
//---------------------REGISTERS-----------------------------------------------------
enum
{
BME280_REGISTER_DIG_T1 = 0x88,
BME280_REGISTER_DIG_T2 = 0x8A,
BME280_REGISTER_DIG_T3 = 0x8C,
BME280_REGISTER_DIG_P1 = 0x8E,
BME280_REGISTER_DIG_P2 = 0x90,
BME280_REGISTER_DIG_P3 = 0x92,
BME280_REGISTER_DIG_P4 = 0x94,
BME280_REGISTER_DIG_P5 = 0x96,
BME280_REGISTER_DIG_P6 = 0x98,
BME280_REGISTER_DIG_P7 = 0x9A,
BME280_REGISTER_DIG_P8 = 0x9C,
BME280_REGISTER_DIG_P9 = 0x9E,
BME280_REGISTER_DIG_H1 = 0xA1,
BME280_REGISTER_DIG_H2 = 0xE1,
BME280_REGISTER_DIG_H3 = 0xE3,
BME280_REGISTER_DIG_H4 = 0xE4,
BME280_REGISTER_DIG_H5 = 0xE5,
BME280_REGISTER_DIG_H6 = 0xE7,
BME280_REGISTER_CHIPID = 0xD0,
BME280_REGISTER_VERSION = 0xD1,
BME280_REGISTER_SOFTRESET = 0xE0,
BME280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0
BME280_REGISTER_CONTROLHUMID = 0xF2,
BME280_REGISTER_CONTROL = 0xF4,
BME280_REGISTER_CONFIG = 0xF5,
BME280_REGISTER_PRESSUREDATA = 0xF7,
BME280_REGISTER_TEMPDATA = 0xFA,
BME280_REGISTER_HUMIDDATA = 0xFD,
};
//---------------------CALIBRATION DATA----------------------------------------------
typedef struct
{
uint16_t dig_T1;
int16_t dig_T2;
int16_t dig_T3;
uint16_t dig_P1;
int16_t dig_P2;
int16_t dig_P3;
int16_t dig_P4;
int16_t dig_P5;
int16_t dig_P6;
int16_t dig_P7;
int16_t dig_P8;
int16_t dig_P9;
uint8_t dig_H1;
int16_t dig_H2;
uint8_t dig_H3;
int16_t dig_H4;
int16_t dig_H5;
int8_t dig_H6;
} bme280_calib_data;
//---------------------TEMPERATURE UNITS----------------------------------------------
enum BME280_temp_t
{
BME280_C,
BME280_F
};
//---------------------TEMPLATE/STRUCTURE---------------------------------------------
template <BME280_temp_t tempunit = BME280_C,
uint8_t _i2caddr = BME280_ADDRESS>
struct BME280 {
private:
bme280_calib_data _bme280_calib;
//---------------Writes an 8 bit value over I2C
void write8(byte reg, byte value) {
Wire.beginTransmission((uint8_t)_i2caddr);
Wire.write((uint8_t)reg);
Wire.write((uint8_t)value);
Wire.endTransmission();
}
//---------------Reads an 8 bit value over I2C
uint8_t read8(byte reg) {
uint8_t value;
Wire.beginTransmission((uint8_t)_i2caddr);
Wire.write((uint8_t)reg);
Wire.endTransmission();
Wire.requestFrom((uint8_t)_i2caddr, (byte)1);
value = Wire.read();
Wire.endTransmission();
return value;
};
//---------------Reads a 16 bit value over I2C
uint16_t read16(byte reg) {
uint16_t value;
Wire.beginTransmission((uint8_t)_i2caddr);
Wire.write((uint8_t)reg);
Wire.endTransmission();
Wire.requestFrom((uint8_t)_i2caddr, (byte)2);
value = (Wire.read() << 8) | Wire.read();
Wire.endTransmission();
return value;
};
uint16_t read16_LE(byte reg) {
uint16_t temp = read16(reg);
return (temp >> 8) | (temp << 8);
};
//---------------Reads a signed 16 bit value over I2C
int16_t readS16(byte reg) {
return (int16_t)read16(reg);
};
int16_t readS16_LE(byte reg) {
return (int16_t)read16_LE(reg);
};
//---------------Reads the factory-set coefficients
void readCoefficients(void) {
_bme280_calib.dig_T1 = read16_LE(BME280_REGISTER_DIG_T1);
_bme280_calib.dig_T2 = readS16_LE(BME280_REGISTER_DIG_T2);
_bme280_calib.dig_T3 = readS16_LE(BME280_REGISTER_DIG_T3);
_bme280_calib.dig_P1 = read16_LE(BME280_REGISTER_DIG_P1);
_bme280_calib.dig_P2 = readS16_LE(BME280_REGISTER_DIG_P2);
_bme280_calib.dig_P3 = readS16_LE(BME280_REGISTER_DIG_P3);
_bme280_calib.dig_P4 = readS16_LE(BME280_REGISTER_DIG_P4);
_bme280_calib.dig_P5 = readS16_LE(BME280_REGISTER_DIG_P5);
_bme280_calib.dig_P6 = readS16_LE(BME280_REGISTER_DIG_P6);
_bme280_calib.dig_P7 = readS16_LE(BME280_REGISTER_DIG_P7);
_bme280_calib.dig_P8 = readS16_LE(BME280_REGISTER_DIG_P8);
_bme280_calib.dig_P9 = readS16_LE(BME280_REGISTER_DIG_P9);
_bme280_calib.dig_H1 = read8(BME280_REGISTER_DIG_H1);
_bme280_calib.dig_H2 = readS16_LE(BME280_REGISTER_DIG_H2);
_bme280_calib.dig_H3 = read8(BME280_REGISTER_DIG_H3);
_bme280_calib.dig_H4 = (read8(BME280_REGISTER_DIG_H4) << 4) | (read8(BME280_REGISTER_DIG_H4+1) & 0xF);
_bme280_calib.dig_H5 = (read8(BME280_REGISTER_DIG_H5+1) << 4) | (read8(BME280_REGISTER_DIG_H5) >> 4);
_bme280_calib.dig_H6 = (int8_t)read8(BME280_REGISTER_DIG_H6);
};
public:
float temperature = 0;
float pressure = 0;
float humidity = 0;
bool begin() {
Wire.begin();
if (read8(BME280_REGISTER_CHIPID) != 0x60)
return false;
readCoefficients();
write8(BME280_REGISTER_CONTROLHUMID, 0x03); // Set before CONTROL (DS 5.4.3)
write8(BME280_REGISTER_CONTROL, 0x3F);
return true;
};
void refresh() {
//------------------temperature
//int32_t var1, var2;
int32_t adc_T = read16(BME280_REGISTER_TEMPDATA);
adc_T <<= 8;
adc_T |= read8(BME280_REGISTER_TEMPDATA+2);
adc_T >>= 4;
int32_t var1t = ((((adc_T>>3) - ((int32_t)_bme280_calib.dig_T1 <<1))) *
((int32_t)_bme280_calib.dig_T2)) >> 11;
int32_t var2t = (((((adc_T>>4) - ((int32_t)_bme280_calib.dig_T1)) *
((adc_T>>4) - ((int32_t)_bme280_calib.dig_T1))) >> 12) *
((int32_t)_bme280_calib.dig_T3)) >> 14;
int32_t t_fine = var1t + var2t;
float T = (t_fine * 5 + 128) >> 8;
temperature = T/100;
//------------------pressure
int64_t var1, var2, p;
int32_t adc_P = read16(BME280_REGISTER_PRESSUREDATA);
adc_P <<= 8;
adc_P |= read8(BME280_REGISTER_PRESSUREDATA+2);
adc_P >>= 4;
var1 = ((int64_t)t_fine) - 128000;
var2 = var1 * var1 * (int64_t)_bme280_calib.dig_P6;
var2 = var2 + ((var1*(int64_t)_bme280_calib.dig_P5)<<17);
var2 = var2 + (((int64_t)_bme280_calib.dig_P4)<<35);
var1 = ((var1 * var1 * (int64_t)_bme280_calib.dig_P3)>>8) +
((var1 * (int64_t)_bme280_calib.dig_P2)<<12);
var1 = (((((int64_t)1)<<47)+var1))*((int64_t)_bme280_calib.dig_P1)>>33;
if (var1 == 0) {
//return 0; // avoid exception caused by division by zero
return; // avoid exception caused by division by zero
}
p = 1048576 - adc_P;
p = (((p<<31) - var2)*3125) / var1;
var1 = (((int64_t)_bme280_calib.dig_P9) * (p>>13) * (p>>13)) >> 25;
var2 = (((int64_t)_bme280_calib.dig_P8) * p) >> 19;
p = ((p + var1 + var2) >> 8) + (((int64_t)_bme280_calib.dig_P7)<<4);
pressure = (float)p/256;
//------------------humidity
int32_t adc_H = read16(BME280_REGISTER_HUMIDDATA);
int32_t v_x1_u32r;
v_x1_u32r = (t_fine - ((int32_t)76800));
v_x1_u32r = (((((adc_H << 14) - (((int32_t)_bme280_calib.dig_H4) << 20) -
(((int32_t)_bme280_calib.dig_H5) * v_x1_u32r)) + ((int32_t)16384)) >> 15) *
(((((((v_x1_u32r * ((int32_t)_bme280_calib.dig_H6)) >> 10) *
(((v_x1_u32r * ((int32_t)_bme280_calib.dig_H3)) >> 11) + ((int32_t)32768))) >> 10) +
((int32_t)2097152)) * ((int32_t)_bme280_calib.dig_H2) + 8192) >> 14));
v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) *
((int32_t)_bme280_calib.dig_H1)) >> 4));
v_x1_u32r = (v_x1_u32r < 0) ? 0 : v_x1_u32r;
v_x1_u32r = (v_x1_u32r > 419430400) ? 419430400 : v_x1_u32r;
float h = (v_x1_u32r>>12);
humidity = h / 1024.0;
};
//float pressureToAltitude(float seaLevel, float atmospheric) {
float pressureToAltitude(float seaLevel = 101325.00) {
////float atmospheric = pressure / 100.0F; //hPa
//float atmospheric = pressure; //Pa
//return 44330.0 * (1.0 - pow(atmospheric / seaLevel, 0.1903));
return 44330.0 * (1.0 - pow(pressure / seaLevel, 0.1903));
};
//float seaLevelForAltitude(float altitude = 150.50, float atmospheric) {
float seaLevelForAltitude(float altitude = 150.50) {
////float atmospheric = pressure / 100.0F; //hPa
//float atmospheric = pressure; //Pa
//return pow((altitude/44330.0) + 1.0, 5.255F) * atmospheric;
return pow((altitude / 44330.0) + 1.0, 5.255F) * pressure;
};
};
#endif