bme280, nRF51822 internal temperature, oled ssd1306 128x64. Короче сборный тест.
Dependencies: mbed SSD1306_128x64_I2C BLE_API nRF51822 Buzzer
bme280.cpp
- Committer:
- mamont090671
- Date:
- 2019-11-30
- Revision:
- 4:606e79b9a9ce
- Parent:
- 2:4700f7e71737
File content as of revision 4:606e79b9a9ce:
/* bme280.cpp - driver for Bosch Sensortec BME280 combined humidity and pressure sensor. Copyright (c) 2015 Elektor 26/11/2015 - CPV, Initial release. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "bme280.h" BME280::BME280(void) { _i2c_address = 0; _t_fine = 0; _temperature = 0; _pressure = 0; _humidity = 0; clearCalibrationData(); } void BME280::clearCalibrationData(void) { _dig_T1 = 0; _dig_T2 = 0; _dig_T3 = 0; _dig_P1 = 0; _dig_P2 = 0; _dig_P3 = 0; _dig_P4 = 0; _dig_P5 = 0; _dig_P6 = 0; _dig_P7 = 0; _dig_P8 = 0; _dig_P9 = 0; _dig_H1 = 0; _dig_H2 = 0; _dig_H3 = 0; _dig_H4 = 0; _dig_H5 = 0; _dig_H6 = 0; } uint8_t BME280::begin(uint8_t i2cAddress) { _i2c_address = i2cAddress; if (readId()==BME280_ID) { clearCalibrationData(); readCalibrationData(); return 0; } return (uint8_t)-1; } void BME280::busWrite(uint8_t *p_data, uint8_t data_size, uint8_t repeated_start) { if (_i2c_address==BME280_I2C_ADDRESS1 || _i2c_address==BME280_I2C_ADDRESS2) { // Assume I2C bus. i2cWrite(_i2c_address,p_data,data_size,repeated_start); } /* else { // Assume SPI bus. // First byte is supposed to be the address of the register to write to, set R/~W bit to 0. p_data[0] &= 0x7f; spiWrite(p_data,data_size); }*/ } void BME280::busRead(uint8_t *p_data, uint8_t data_size) { if (_i2c_address==BME280_I2C_ADDRESS1 || _i2c_address==BME280_I2C_ADDRESS2) { // Assume I2C bus. i2cRead(_i2c_address,p_data,data_size); } /** else { // Assume SPI bus. // First byte is supposed to be the address of the register to write to, set R/~W bit to 1. p_data[0] |= 0x80; spiRead(p_data,data_size); }**/ } uint8_t BME280::readUint8(uint8_t reg) { uint8_t data; busWrite(®,1,1); // Use repeated start. busRead(&data,1); // Read one byte. return data; } uint16_t BME280::readUint16(uint8_t reg) { uint8_t data[2]; uint16_t value; busWrite(®,1,1); // Use repeated start. busRead(data,2); // Read two bytes. // Process as little endian, which is the case for calibration data. value = data[1]; value = (value<<8) | data[0]; return value; } void BME280::readCalibrationData(void) { _dig_T1 = readUint16(BME280_CAL_T1); _dig_T2 = (int16_t) readUint16(BME280_CAL_T2); _dig_T3 = (int16_t) readUint16(BME280_CAL_T3); _dig_P1 = readUint16(BME280_CAL_P1); _dig_P2 = (int16_t) readUint16(BME280_CAL_P2); _dig_P3 = (int16_t) readUint16(BME280_CAL_P3); _dig_P4 = (int16_t) readUint16(BME280_CAL_P4); _dig_P5 = (int16_t) readUint16(BME280_CAL_P5); _dig_P6 = (int16_t) readUint16(BME280_CAL_P6); _dig_P7 = (int16_t) readUint16(BME280_CAL_P7); _dig_P8 = (int16_t) readUint16(BME280_CAL_P8); _dig_P9 = (int16_t) readUint16(BME280_CAL_P9); _dig_H1 = readUint8(BME280_CAL_H1); _dig_H2 = (int16_t) readUint16(BME280_CAL_H2); _dig_H3 = readUint8(BME280_CAL_H3); // H4 & H5 share a byte. uint8_t temp1 = readUint8(BME280_CAL_H4); uint8_t temp2 = readUint8(BME280_CAL_H45); uint8_t temp3 = readUint8(BME280_CAL_H5); _dig_H4 = (temp1<<4) | (temp2&0x0f); _dig_H5 = (temp3<<4) | (temp2>>4); _dig_H6 = (int8_t) readUint8(BME280_CAL_H6); } uint8_t BME280::readFrom(uint8_t reg, uint8_t data_size, uint8_t *p_data) { // Set start address to read from. busWrite(®,1,1); // Use repeated start. // Now read the requested number of bytes. busRead(p_data,data_size); return data_size; } void BME280::read(void) { // Get all the measurements in one burst (recommended). uint8_t data[BME280_MEASUREMENT_SIZE]; readFrom(BME280_MEASUREMENT_REGISTER,BME280_MEASUREMENT_SIZE,data); // We assume Normal mode, so it is not necessary to reissue a Forced mode command here. // Process data. int32_t p = assembleRawValue(&data[0],1); int32_t t = assembleRawValue(&data[3],1); int32_t h = assembleRawValue(&data[6],0); _temperature = compensateTemperature(t); // First call this before calling the other compensate functions. _pressure = compensatePressure(p); // Uses value calculated by compensateTemperature. _humidity = compensateHumidity(h); // Uses value calculated by compensateTemperature. } int32_t BME280::assembleRawValue(uint8_t *p_data, uint8_t has_xlsb) { // Needed to decode sensor data. uint32_t value = p_data[0]; value <<= 8; value |= p_data[1]; if (has_xlsb!=0) { value <<= 4; value |= (p_data[2]>>4); } return (int32_t) value; } void BME280::writeControlRegisters(uint8_t osrs_t, uint8_t osrs_p, uint8_t osrs_h, uint8_t mode) { uint8_t data[2]; data[0] = BME280_CTRL_HUM_REGISTER; data[1] = (osrs_h&0x07); busWrite(data,2,0); // Writing CTRL_MEAS validates previous write to CTRL_HUM. data[0] = BME280_CTRL_MEAS_REGISTER; data[1] = ((osrs_t&0x07)<<5) | ((osrs_p&0x07)<<2) | (mode&0x03); busWrite(data,2,0); } void BME280::writeConfigRegister(uint8_t t_sb, uint8_t filter, uint8_t spi) { uint8_t data[2]; data[0] = BME280_CONFIG_REGISTER; data[1] = ((t_sb&0x07)<<5) | ((filter&0x07)<<2) | (spi&0x01); busWrite(data,2,0); } void BME280::reset(void) { uint8_t data[2] = { BME280_RESET_REGISTER, BME280_RESET }; busWrite(data,2,0); } uint8_t BME280::readId(void) { return readUint8(BME280_ID_REGISTER); } #if BME280_ALLOW_FLOAT!=0 // From the driver by Bosch Sensortec //! // @brief Reads actual temperature from uncompensated temperature // @note returns the value in Degree centigrade // @note Output value of "51.23" equals 51.23 DegC. // // @param adc_T : value of uncompensated temperature // // @return Return the actual temperature in floating point // temperature_t BME280::compensateTemperature(int32_t adc_T) { double v_x1_u32; double v_x2_u32; double temperature; v_x1_u32 = (((double)adc_T) / 16384.0 - ((double)_dig_T1) / 1024.0) * ((double)_dig_T2); v_x2_u32 = ((((double)adc_T) / 131072.0 - ((double)_dig_T1) / 8192.0) * (((double)adc_T) / 131072.0 - ((double)_dig_T1) / 8192.0)) * ((double)_dig_T3); _t_fine = (int32_t)(v_x1_u32 + v_x2_u32); temperature = (v_x1_u32 + v_x2_u32) / 5120.0; return temperature; } //! // @brief Reads actual pressure from uncompensated pressure // @note Returns pressure in Pa as double. // @note Output value of "96386.2" // equals 96386.2 Pa = 963.862 hPa. // // @param adc_P : value of uncompensated pressure // // @return Return the actual pressure in floating point // pressure_t BME280::compensatePressure(int32_t adc_P) { double v_x1_u32; double v_x2_u32; double pressure; v_x1_u32 = ((double)_t_fine / 2.0) - 64000.0; v_x2_u32 = v_x1_u32 * v_x1_u32 * ((double)_dig_P6) / 32768.0; v_x2_u32 = v_x2_u32 + v_x1_u32 * ((double)_dig_P5) * 2.0; v_x2_u32 = (v_x2_u32 / 4.0) + (((double)_dig_P4) * 65536.0); v_x1_u32 = (((double)_dig_P3) * v_x1_u32 * v_x1_u32 / 524288.0 + ((double)_dig_P2) * v_x1_u32) / 524288.0; v_x1_u32 = (1.0 + v_x1_u32 / 32768.0) * ((double)_dig_P1); pressure = 1048576.0 - (double)adc_P; // Avoid exception caused by division by zero. if (v_x1_u32 != 0) pressure = (pressure - (v_x2_u32 / 4096.0)) * 6250.0 / v_x1_u32; else return 0; v_x1_u32 = ((double)_dig_P9) * pressure * pressure / 2147483648.0; v_x2_u32 = pressure * ((double)_dig_P8) / 32768.0; pressure = pressure + (v_x1_u32 + v_x2_u32 + ((double)_dig_P7)) / 16.0; return pressure; } //! // @brief Reads actual humidity from uncompensated humidity // @note returns the value in relative humidity (%rH) // @note Output value of "42.12" equals 42.12 %rH // // @param adc_H : value of uncompensated humidity // // @return Return the actual humidity in floating point // humidity_t BME280::compensateHumidity(int32_t adc_H) { double var_h; var_h = (((double)_t_fine) - 76800.0); if (var_h != 0) { var_h = (adc_H - (((double)_dig_H4) * 64.0 + ((double)_dig_H5) / 16384.0 * var_h)) * (((double)_dig_H2) / 65536.0 * (1.0 + ((double) _dig_H6) / 67108864.0 * var_h * (1.0 + ((double)_dig_H3) / 67108864.0 * var_h))); } else return 0; var_h = var_h * (1.0 - ((double)_dig_H1)*var_h / 524288.0); if (var_h > 100.0) var_h = 100.0; else if (var_h < 0.0) var_h = 0.0; return var_h; } #else /* BME280_ALLOW_FLOAT */ // From the datasheet. // Returns temperature in DegC, resolution is 0.01 DegC. Output value of 5123 equals 51.23 DegC. // _t_fine carries fine temperature as "global" value. temperature_t BME280::compensateTemperature(int32_t adc_T) { int32_t var1, var2, T; var1 = ((((adc_T>>3) - ((int32_t)_dig_T1<<1))) * ((int32_t)_dig_T2)) >> 11; var2 = (((((adc_T>>4) - ((int32_t)_dig_T1)) * ((adc_T>>4) - ((int32_t)_dig_T1))) >> 12) * ((int32_t)_dig_T3)) >> 14; _t_fine = var1 + var2; T = (_t_fine * 5 + 128) >> 8; return T; } // From the datasheet. // Returns pressure in Pa as unsigned 32 bit integer. Output value of 96386 equals 96386 Pa = 963.86 hPa pressure_t BME280::compensatePressure(int32_t adc_P) { int32_t var1, var2; uint32_t p; var1 = (((int32_t)_t_fine)>>1) - (int32_t)64000; var2 = (((var1>>2) * (var1>>2)) >> 11 ) * ((int32_t)_dig_P6); var2 = var2 + ((var1*((int32_t)_dig_P5))<<1); var2 = (var2>>2)+(((int32_t)_dig_P4)<<16); var1 = (((_dig_P3 * (((var1>>2) * (var1>>2)) >> 13 )) >> 3) + ((((int32_t)_dig_P2) * var1)>>1))>>18; var1 =((((32768+var1))*((int32_t)_dig_P1))>>15); if (var1 == 0) { return 0; // avoid exception caused by division by zero } p = (((uint32_t)(((int32_t)1048576)-adc_P)-(var2>>12)))*3125; if (p < 0x80000000) { p = (p << 1) / ((uint32_t)var1); } else { p = (p / (uint32_t)var1) * 2; } var1 = (((int32_t)_dig_P9) * ((int32_t)(((p>>3) * (p>>3))>>13)))>>12; var2 = (((int32_t)(p>>2)) * ((int32_t)_dig_P8))>>13; p = (uint32_t)((int32_t)p + ((var1 + var2 + _dig_P7) >> 4)); return p; } // From the datasheet. // 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 humidity_t BME280::compensateHumidity(int32_t adc_H) { int32_t v_x1_u32r; v_x1_u32r = (_t_fine - ((int32_t)76800)); v_x1_u32r = (((((adc_H << 14) - (((int32_t)_dig_H4) << 20) - (((int32_t)_dig_H5) * v_x1_u32r)) + ((int32_t)16384)) >> 15) * (((((((v_x1_u32r * ((int32_t)_dig_H6)) >> 10) * (((v_x1_u32r * ((int32_t)_dig_H3)) >> 11) + ((int32_t)32768))) >> 10) + ((int32_t)2097152)) * ((int32_t)_dig_H2) + 8192) >> 14)); v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((int32_t)_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); return (uint32_t)(v_x1_u32r>>12); } #endif /* BME280_ALLOW_FLOAT */