151 lines
3.9 KiB
C++
151 lines
3.9 KiB
C++
#include <Arduino.h>
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#include <stdint.h>
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#include <Wire.h>
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#include "BME280.h"
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BME280::BME280() {}
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void BME280::getCalData() {
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dig_T1 = read16_LE(0x88);
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dig_T2 = readS16_LE(0x8A);
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dig_T3 = readS16_LE(0x8C);
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dig_P1 = read16_LE(0x8E);
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dig_P2 = readS16_LE(0x90);
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dig_P3 = readS16_LE(0x92);
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dig_P4 = readS16_LE(0x94);
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dig_P5 = readS16_LE(0x96);
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dig_P6 = readS16_LE(0x98);
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dig_P7 = readS16_LE(0x9A);
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dig_P8 = readS16_LE(0x9C);
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dig_P9 = readS16_LE(0x9E);
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dig_H1 = read8(0xA1);
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dig_H2 = readS16_LE(0xE1);
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dig_H3 = read8(0xE3);
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dig_H4 = (read8(0xE4) << 4) | (read8(0xE5) & 0xF);
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dig_H5 = (read8(0xE6) << 4) | (read8(0xE5) >> 4);
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dig_H6 = (int8_t)read8(0xE7);
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}
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int32_t BME280::compensate_t(int32_t adc_T)
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{
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int32_t var1, var2, T;
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var1 = ((((adc_T>>3) - ((int32_t)dig_T1<<1))) * ((int32_t)dig_T2)) >> 11;
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var2 = (((((adc_T>>4) - ((int32_t)dig_T1)) * ((adc_T>>4) - ((int32_t)dig_T1))) >> 12) * ((int32_t)dig_T3)) >> 14;
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t_fine = var1 + var2;
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T = (t_fine * 5 + 128) >> 8;
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return T;
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}
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int32_t BME280::compensate_p(int32_t adc_P)
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{
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int32_t var1, var2;
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uint32_t p;
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var1 = (((int32_t)t_fine)>>1) -(int32_t)64000;
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var2 = (((var1>>2) * (var1>>2)) >> 11 ) * ((int32_t)dig_P6);
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var2 = var2 + ((var1*((int32_t)dig_P5))<<1);var2 = (var2>>2)+(((int32_t)dig_P4)<<16);
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var1 = (((dig_P3 * (((var1>>2) * (var1>>2)) >> 13 )) >> 3) + ((((int32_t)dig_P2) * var1)>>1))>>18;
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var1 =((((32768+var1))*((int32_t)dig_P1))>>15);
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if (var1 == 0) {
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return 0;
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}
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p = (((uint32_t)(((int32_t)1048576)-adc_P)-(var2>>12)))*3125;
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if (p < 0x80000000) {
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p = (p << 1) / ((uint32_t)var1);
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} else {
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p = (p / (uint32_t)var1) * 2;
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}
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var1 = (((int32_t)dig_P9) * ((int32_t)(((p>>3) * (p>>3))>>13)))>>12;
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var2 = (((int32_t)(p>>2)) * ((int32_t)dig_P8))>>13;
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p = (uint32_t)((int32_t)p + ((var1 + var2 + dig_P7) >> 4));
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return p;
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}
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int32_t BME280::compensate_h(int32_t adc_H)
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{
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int32_t v_x1_u32r;
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v_x1_u32r=(t_fine-((int32_t)76800));
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v_x1_u32r=(((((adc_H<<14)-(((int32_t)dig_H4)<<20)-(((int32_t)dig_H5)*v_x1_u32r))+
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((int32_t)16384))>>15)*(((((((v_x1_u32r*((int32_t)dig_H6))>>10)*
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(((v_x1_u32r*((int32_t)dig_H3))>>11)+((int32_t)32768)))>>10)+
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((int32_t)2097152))*((int32_t)dig_H2)+8192)>>14));
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v_x1_u32r=(v_x1_u32r-(((((v_x1_u32r>>15)*(v_x1_u32r>>15))>>7)*((int32_t)dig_H1))>>4));
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v_x1_u32r=(v_x1_u32r < 0 ? 0 : v_x1_u32r);
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v_x1_u32r=(v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r);
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return (uint32_t)((v_x1_u32r>>12)/10);
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}
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void BME280::getData(int32_t *t, int32_t *p, int32_t *h) {
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int32_t UP, UT, UH;
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int32_t rawP, rawT;
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// Trigger Measurement
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// Set Sensor Config
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write8(0xF2, 0b00000001); // 1x Oversampling for Humidity
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write8(0xF4, 0b00100101); // 1x Oversampling for Temperature, Pressure, Forced Mode
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delay(10);
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// Read Pressure
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rawP = read16(0xF7);
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rawP <<= 8;
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rawP |= read8(0xF9);
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UP = rawP >> 4;
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// Read Temperature
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rawT = read16(0xFA);
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rawT <<= 8;
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rawT |= read8(0xFC);
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UT = rawT >> 4;
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// Read Humidity
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UH = read16(0xFD);
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// Compensate Values and Return
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*t = compensate_t(UT);
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*p = compensate_p(UP);
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*h = compensate_h(UH);
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}
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uint8_t BME280::read8(uint8_t addr) {
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Wire.beginTransmission(BME280_I2CADDR);
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Wire.write(addr);
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Wire.endTransmission();
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Wire.requestFrom(BME280_I2CADDR, 1);
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uint8_t ret = Wire.read();
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return ret;
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}
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uint16_t BME280::read16(uint8_t addr) {
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Wire.beginTransmission(BME280_I2CADDR);
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Wire.write(addr);
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Wire.endTransmission();
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Wire.requestFrom(BME280_I2CADDR, 2);
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uint16_t ret = (Wire.read() << 8) | Wire.read();
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return ret;
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}
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uint16_t BME280::read16_LE(uint8_t addr) {
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uint16_t temp = read16(addr);
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return (temp >> 8) | (temp << 8);
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}
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int16_t BME280::readS16(uint8_t addr) {
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return (int16_t)read16(addr);
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}
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int16_t BME280::readS16_LE(uint8_t addr) {
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return (int16_t)read16_LE(addr);
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}
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void BME280::write8(uint8_t addr, uint8_t data) {
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Wire.beginTransmission(BME280_I2CADDR);
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Wire.write(addr);
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Wire.write(data);
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Wire.endTransmission();
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}
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