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‎Grove_BMP280/Seeed_BMP280.cpp

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#include "Seeed_BMP280.h"
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#define BMP280_DEBUG_PRINT
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bool BMP280::init(int i2c_addr) {
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uint8_t chip_id = 0;
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uint8_t retry = 0;
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_devAddr = i2c_addr;
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Wire.begin();
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while ((retry++ < 5) && (chip_id != 0x58)) {
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chip_id = bmp280Read8(BMP280_REG_CHIPID);
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#ifdef BMP280_DEBUG_PRINT
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Serial.print("Read chip ID: ");
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Serial.println(chip_id);
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#endif
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delay(100);
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}
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dig_T1 = bmp280Read16LE(BMP280_REG_DIG_T1);
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dig_T2 = bmp280ReadS16LE(BMP280_REG_DIG_T2);
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dig_T3 = bmp280ReadS16LE(BMP280_REG_DIG_T3);
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dig_P1 = bmp280Read16LE(BMP280_REG_DIG_P1);
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dig_P2 = bmp280ReadS16LE(BMP280_REG_DIG_P2);
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dig_P3 = bmp280ReadS16LE(BMP280_REG_DIG_P3);
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dig_P4 = bmp280ReadS16LE(BMP280_REG_DIG_P4);
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dig_P5 = bmp280ReadS16LE(BMP280_REG_DIG_P5);
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dig_P6 = bmp280ReadS16LE(BMP280_REG_DIG_P6);
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dig_P7 = bmp280ReadS16LE(BMP280_REG_DIG_P7);
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dig_P8 = bmp280ReadS16LE(BMP280_REG_DIG_P8);
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dig_P9 = bmp280ReadS16LE(BMP280_REG_DIG_P9);
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writeRegister(BMP280_REG_CONTROL, 0x3F);
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return true;
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}
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float BMP280::getTemperature(void) {
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int32_t var1, var2;
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int32_t adc_T = bmp280Read24(BMP280_REG_TEMPDATA);
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// Check if the last transport successed
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if (!isTransport_OK) {
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return 0;
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}
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adc_T >>= 4;
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var1 = (((adc_T >> 3) - ((int32_t)(dig_T1 << 1))) *
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((int32_t)dig_T2)) >> 11;
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var2 = (((((adc_T >> 4) - ((int32_t)dig_T1)) *
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((adc_T >> 4) - ((int32_t)dig_T1))) >> 12) *
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((int32_t)dig_T3)) >> 14;
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t_fine = var1 + var2;
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float T = (t_fine * 5 + 128) >> 8;
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return T / 100;
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}
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uint32_t BMP280::getPressure(void) {
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int64_t var1, var2, p;
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// Call getTemperature to get t_fine
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getTemperature();
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// Check if the last transport successed
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if (!isTransport_OK) {
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return 0;
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}
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int32_t adc_P = bmp280Read24(BMP280_REG_PRESSUREDATA);
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adc_P >>= 4;
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var1 = ((int64_t)t_fine) - 128000;
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var2 = var1 * var1 * (int64_t)dig_P6;
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var2 = var2 + ((var1 * (int64_t)dig_P5) << 17);
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var2 = var2 + (((int64_t)dig_P4) << 35);
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var1 = ((var1 * var1 * (int64_t)dig_P3) >> 8) + ((var1 * (int64_t)dig_P2) << 12);
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var1 = (((((int64_t)1) << 47) + var1)) * ((int64_t)dig_P1) >> 33;
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if (var1 == 0) {
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return 0; // avoid exception caused by division by zero
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}
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p = 1048576 - adc_P;
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p = (((p << 31) - var2) * 3125) / var1;
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var1 = (((int64_t)dig_P9) * (p >> 13) * (p >> 13)) >> 25;
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var2 = (((int64_t)dig_P8) * p) >> 19;
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p = ((p + var1 + var2) >> 8) + (((int64_t)dig_P7) << 4);
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return (uint32_t)p / 256;
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}
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float BMP280::calcAltitude(float p0, float p1, float t) {
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double C;
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Serial.print("p0 = ");
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Serial.println(p0);
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Serial.print("p1 = ");
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Serial.println(p1);
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Serial.print("t = ");
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Serial.println(t);
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C = (p0 / p1);
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Serial.print("C = ");
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Serial.println(C);
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C = pow(C, (1.0 / 5.25588)) - 1.0;
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Serial.print("C = ");
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Serial.println(C);
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C = (C * (t + 273.15)) / 0.0065;
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Serial.print("C = ");
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Serial.println(C);
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return C;
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}
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float BMP280::calcAltitude(float p0) {
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if (!isTransport_OK) {
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return 0;
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}
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float t = getTemperature();
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float p1 = getPressure();
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return calcAltitude(p0, p1, t);
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}
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uint8_t BMP280::bmp280Read8(uint8_t reg) {
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Wire.beginTransmission(_devAddr);
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Wire.write(reg);
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Wire.endTransmission();
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Wire.requestFrom(_devAddr, 1);
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// return 0 if slave didn't response
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if (Wire.available() < 1) {
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isTransport_OK = false;
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return 0;
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} else if (isTransport_OK == false) {
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isTransport_OK = true;
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}
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return Wire.read();
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}
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uint16_t BMP280::bmp280Read16(uint8_t reg) {
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uint8_t msb, lsb;
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Wire.beginTransmission(_devAddr);
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Wire.write(reg);
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Wire.endTransmission();
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Wire.requestFrom(_devAddr, 2);
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// return 0 if slave didn't response
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if (Wire.available() < 2) {
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isTransport_OK = false;
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return 0;
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} else {
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isTransport_OK = true;
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}
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msb = Wire.read();
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lsb = Wire.read();
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return (uint16_t) msb << 8 | lsb;
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}
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uint16_t BMP280::bmp280Read16LE(uint8_t reg) {
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uint16_t data = bmp280Read16(reg);
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return (data >> 8) | (data << 8);
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}
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int16_t BMP280::bmp280ReadS16(uint8_t reg) {
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return (int16_t)bmp280Read16(reg);
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}
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int16_t BMP280::bmp280ReadS16LE(uint8_t reg) {
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return (int16_t)bmp280Read16LE(reg);
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}
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uint32_t BMP280::bmp280Read24(uint8_t reg) {
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uint32_t data;
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Wire.beginTransmission(_devAddr);
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Wire.write(reg);
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Wire.endTransmission();
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Wire.requestFrom(_devAddr, 3);
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// return 0 if slave didn't response
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if (Wire.available() < 3) {
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isTransport_OK = false;
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return 0;
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} else if (isTransport_OK == false) {
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isTransport_OK = true;
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if (!init(_devAddr)) {
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#ifdef BMP280_DEBUG_PRINT
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Serial.println("Device not connected or broken!");
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#endif
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}
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}
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data = Wire.read();
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data <<= 8;
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data |= Wire.read();
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data <<= 8;
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data |= Wire.read();
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return data;
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}
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void BMP280::writeRegister(uint8_t reg, uint8_t val) {
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Wire.beginTransmission(_devAddr); // start transmission to device
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Wire.write(reg); // send register address
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Wire.write(val); // send value to write
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Wire.endTransmission(); // end transmission
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}

‎Grove_BMP280/Seeed_BMP280.h

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#ifndef _SEEED_BMP280_H_
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#define _SEEED_BMP280_H_
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#include <Arduino.h>
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#include <Wire.h>
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#define BMP280_ADDRESS 0x77
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#define BMP280_REG_DIG_T1 0x88
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#define BMP280_REG_DIG_T2 0x8A
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#define BMP280_REG_DIG_T3 0x8C
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#define BMP280_REG_DIG_P1 0x8E
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#define BMP280_REG_DIG_P2 0x90
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#define BMP280_REG_DIG_P3 0x92
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#define BMP280_REG_DIG_P4 0x94
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#define BMP280_REG_DIG_P5 0x96
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#define BMP280_REG_DIG_P6 0x98
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#define BMP280_REG_DIG_P7 0x9A
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#define BMP280_REG_DIG_P8 0x9C
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#define BMP280_REG_DIG_P9 0x9E
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#define BMP280_REG_CHIPID 0xD0
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#define BMP280_REG_VERSION 0xD1
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#define BMP280_REG_SOFTRESET 0xE0
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#define BMP280_REG_CONTROL 0xF4
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#define BMP280_REG_CONFIG 0xF5
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#define BMP280_REG_PRESSUREDATA 0xF7
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#define BMP280_REG_TEMPDATA 0xFA
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class BMP280 {
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public:
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bool init(int i2c_addr = BMP280_ADDRESS);
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float getTemperature(void);
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uint32_t getPressure(void);
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float calcAltitude(float p0);
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float calcAltitude(float p0, float p1, float t);
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private:
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bool isTransport_OK;
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int _devAddr;
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// Calibratino data
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uint16_t dig_T1;
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int16_t dig_T2;
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int16_t dig_T3;
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uint16_t dig_P1;
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int16_t dig_P2;
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int16_t dig_P3;
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int16_t dig_P4;
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int16_t dig_P5;
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int16_t dig_P6;
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int16_t dig_P7;
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int16_t dig_P8;
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int16_t dig_P9;
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int32_t t_fine;
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// private functoins
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uint8_t bmp280Read8(uint8_t reg);
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uint16_t bmp280Read16(uint8_t reg);
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uint16_t bmp280Read16LE(uint8_t reg);
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int16_t bmp280ReadS16(uint8_t reg);
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int16_t bmp280ReadS16LE(uint8_t reg);
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uint32_t bmp280Read24(uint8_t reg);
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void writeRegister(uint8_t reg, uint8_t val);
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};
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#endif

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