Edwin Cho / Mbed 2 deprecated TSL2591

Adafruit TSL2591 sensor

Dependencies:   mbed

BME280.cpp@4:66ce66d4c07c, 2016-04-04 (annotated)

Committer:
12104404
Date:
Mon Apr 04 09:09:12 2016 +0000
Revision:
4:66ce66d4c07c
Parent:
3:fecb1929cbef 
<<1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
12104404 3:fecb1929cbef 1 #include "BME280.h"
12104404 3:fecb1929cbef 2
12104404 3:fecb1929cbef 3 BME280::BME280(I2C& bme280_i2c, uint8_t bme280_addr):
12104404 3:fecb1929cbef 4 _i2c(bme280_i2c), _addr(bme280_addr<<1)
12104404 3:fecb1929cbef 5 {
12104404 3:fecb1929cbef 6 _init=false;
12104404 3:fecb1929cbef 7 }
12104404 3:fecb1929cbef 8
12104404 3:fecb1929cbef 9 bool BME280::init(void)
12104404 3:fecb1929cbef 10 {
12104404 3:fecb1929cbef 11 char cmd[18];
12104404 3:fecb1929cbef 12
12104404 3:fecb1929cbef 13 cmd[0] = BME280_CTRL_HUM;
12104404 3:fecb1929cbef 14 cmd[1] = BME280_SAMPLING_X1;
12104404 3:fecb1929cbef 15 if(_i2c.write(_addr, cmd, 2)!=0)
12104404 3:fecb1929cbef 16 return false;
12104404 3:fecb1929cbef 17
12104404 3:fecb1929cbef 18 cmd[0] = BME280_CTRL_MEAS; // ctrl_meas
12104404 3:fecb1929cbef 19 cmd[1] = 0x27; // Temparature oversampling x1, Pressure oversampling x1, Normal mode
12104404 3:fecb1929cbef 20 _i2c.write(_addr, cmd, 2);
12104404 3:fecb1929cbef 21
12104404 3:fecb1929cbef 22 cmd[0] = 0xf5; // config
12104404 3:fecb1929cbef 23 cmd[1] = 0xa0; // Standby 1000ms, Filter off
12104404 3:fecb1929cbef 24 _i2c.write(_addr, cmd, 2);
12104404 3:fecb1929cbef 25
12104404 3:fecb1929cbef 26 cmd[0] = 0x88; // read dig_T regs
12104404 3:fecb1929cbef 27 _i2c.write(_addr, cmd, 1);
12104404 3:fecb1929cbef 28 _i2c.read(_addr, cmd, 6);
12104404 3:fecb1929cbef 29
12104404 3:fecb1929cbef 30 dig_T1 = (cmd[1] << 8) | cmd[0];
12104404 3:fecb1929cbef 31 dig_T2 = (cmd[3] << 8) | cmd[2];
12104404 3:fecb1929cbef 32 dig_T3 = (cmd[5] << 8) | cmd[4];
12104404 3:fecb1929cbef 33
12104404 3:fecb1929cbef 34 cmd[0] = 0x8E; // read dig_P regs
12104404 3:fecb1929cbef 35 _i2c.write(_addr, cmd, 1);
12104404 3:fecb1929cbef 36 _i2c.read(_addr, cmd, 18);
12104404 3:fecb1929cbef 37
12104404 3:fecb1929cbef 38 dig_P1 = (cmd[ 1] << 8) | cmd[ 0];
12104404 3:fecb1929cbef 39 dig_P2 = (cmd[ 3] << 8) | cmd[ 2];
12104404 3:fecb1929cbef 40 dig_P3 = (cmd[ 5] << 8) | cmd[ 4];
12104404 3:fecb1929cbef 41 dig_P4 = (cmd[ 7] << 8) | cmd[ 6];
12104404 3:fecb1929cbef 42 dig_P5 = (cmd[ 9] << 8) | cmd[ 8];
12104404 3:fecb1929cbef 43 dig_P6 = (cmd[11] << 8) | cmd[10];
12104404 3:fecb1929cbef 44 dig_P7 = (cmd[13] << 8) | cmd[12];
12104404 3:fecb1929cbef 45 dig_P8 = (cmd[15] << 8) | cmd[14];
12104404 3:fecb1929cbef 46 dig_P9 = (cmd[17] << 8) | cmd[16];
12104404 3:fecb1929cbef 47
12104404 3:fecb1929cbef 48 cmd[0] = 0xA1; // read dig_H regs
12104404 3:fecb1929cbef 49 _i2c.write(_addr, cmd, 1);
12104404 3:fecb1929cbef 50 _i2c.read(_addr, cmd, 1);
12104404 3:fecb1929cbef 51 cmd[1] = 0xE1; // read dig_H regs
12104404 3:fecb1929cbef 52 _i2c.write(_addr, &cmd[1], 1);
12104404 3:fecb1929cbef 53 _i2c.read(_addr, &cmd[1], 7);
12104404 3:fecb1929cbef 54
12104404 3:fecb1929cbef 55 dig_H1 = cmd[0];
12104404 3:fecb1929cbef 56 dig_H2 = (cmd[2] << 8) | cmd[1];
12104404 3:fecb1929cbef 57 dig_H3 = cmd[3];
12104404 3:fecb1929cbef 58 dig_H4 = (cmd[4] << 4) | (cmd[5] & 0x0f);
12104404 3:fecb1929cbef 59 dig_H5 = (cmd[6] << 4) | ((cmd[5]>>4) & 0x0f);
12104404 3:fecb1929cbef 60 dig_H6 = cmd[7];
12104404 3:fecb1929cbef 61 return true;
12104404 3:fecb1929cbef 62 }
12104404 3:fecb1929cbef 63
12104404 3:fecb1929cbef 64 float BME280::getTemperature(void)
12104404 3:fecb1929cbef 65 {
12104404 3:fecb1929cbef 66 uint32_t temp_raw;
12104404 3:fecb1929cbef 67 float tempf;
12104404 3:fecb1929cbef 68 char cmd[4];
12104404 3:fecb1929cbef 69
12104404 3:fecb1929cbef 70 cmd[0] = 0xfa; // temp_msb
12104404 3:fecb1929cbef 71 _i2c.write(_addr, cmd, 1);
12104404 3:fecb1929cbef 72 _i2c.read(_addr, &cmd[1], 3);
12104404 3:fecb1929cbef 73
12104404 3:fecb1929cbef 74 temp_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
12104404 3:fecb1929cbef 75
12104404 3:fecb1929cbef 76 int32_t temp;
12104404 3:fecb1929cbef 77
12104404 3:fecb1929cbef 78 temp =
12104404 3:fecb1929cbef 79 (((((temp_raw >> 3) - (dig_T1 << 1))) * dig_T2) >> 11) +
12104404 3:fecb1929cbef 80 ((((((temp_raw >> 4) - dig_T1) * ((temp_raw >> 4) - dig_T1)) >> 12) * dig_T3) >> 14);
12104404 3:fecb1929cbef 81
12104404 3:fecb1929cbef 82 t_fine = temp;
12104404 3:fecb1929cbef 83 temp = (temp * 5 + 128) >> 8;
12104404 3:fecb1929cbef 84 tempf = (float)temp;
12104404 3:fecb1929cbef 85
12104404 3:fecb1929cbef 86 return (tempf/100.0f);
12104404 3:fecb1929cbef 87 }
12104404 3:fecb1929cbef 88
12104404 3:fecb1929cbef 89 float BME280::getPressure(void)
12104404 3:fecb1929cbef 90 {
12104404 3:fecb1929cbef 91 uint32_t press_raw;
12104404 3:fecb1929cbef 92 float pressf;
12104404 3:fecb1929cbef 93 char cmd[4];
12104404 3:fecb1929cbef 94
12104404 3:fecb1929cbef 95 cmd[0] = 0xf7; // press_msb
12104404 3:fecb1929cbef 96 _i2c.write(_addr, cmd, 1);
12104404 3:fecb1929cbef 97 _i2c.read(_addr, &cmd[1], 3);
12104404 3:fecb1929cbef 98
12104404 3:fecb1929cbef 99 press_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
12104404 3:fecb1929cbef 100
12104404 3:fecb1929cbef 101 int32_t var1, var2;
12104404 3:fecb1929cbef 102 uint32_t press;
12104404 3:fecb1929cbef 103
12104404 3:fecb1929cbef 104 var1 = (t_fine >> 1) - 64000;
12104404 3:fecb1929cbef 105 var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6;
12104404 3:fecb1929cbef 106 var2 = var2 + ((var1 * dig_P5) << 1);
12104404 3:fecb1929cbef 107 var2 = (var2 >> 2) + (dig_P4 << 16);
12104404 3:fecb1929cbef 108 var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18;
12104404 3:fecb1929cbef 109 var1 = ((32768 + var1) * dig_P1) >> 15;
12104404 3:fecb1929cbef 110 if (var1 == 0) {
12104404 3:fecb1929cbef 111 return 0;
12104404 3:fecb1929cbef 112 }
12104404 3:fecb1929cbef 113 press = (((1048576 - press_raw) - (var2 >> 12))) * 3125;
12104404 3:fecb1929cbef 114 if(press < 0x80000000) {
12104404 3:fecb1929cbef 115 press = (press << 1) / var1;
12104404 3:fecb1929cbef 116 } else {
12104404 3:fecb1929cbef 117 press = (press / var1) * 2;
12104404 3:fecb1929cbef 118 }
12104404 3:fecb1929cbef 119 var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12;
12104404 3:fecb1929cbef 120 var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13;
12104404 3:fecb1929cbef 121 press = (press + ((var1 + var2 + dig_P7) >> 4));
12104404 3:fecb1929cbef 122
12104404 3:fecb1929cbef 123 pressf = (float)press;
12104404 3:fecb1929cbef 124 return (pressf/100.0f);
12104404 3:fecb1929cbef 125 }
12104404 3:fecb1929cbef 126
12104404 3:fecb1929cbef 127 float BME280::getHumidity(void)
12104404 3:fecb1929cbef 128 {
12104404 3:fecb1929cbef 129 uint32_t hum_raw;
12104404 3:fecb1929cbef 130 float humf;
12104404 3:fecb1929cbef 131 char cmd[4];
12104404 3:fecb1929cbef 132
12104404 3:fecb1929cbef 133 cmd[0] = 0xfd; // hum_msb
12104404 3:fecb1929cbef 134 _i2c.write(_addr, cmd, 1);
12104404 3:fecb1929cbef 135 _i2c.read(_addr, &cmd[1], 2);
12104404 3:fecb1929cbef 136
12104404 3:fecb1929cbef 137 hum_raw = (cmd[1] << 8) | cmd[2];
12104404 3:fecb1929cbef 138
12104404 3:fecb1929cbef 139 int32_t v_x1;
12104404 3:fecb1929cbef 140
12104404 3:fecb1929cbef 141 v_x1 = t_fine - 76800;
12104404 3:fecb1929cbef 142 v_x1 = (((((hum_raw << 14) -(((int32_t)dig_H4) << 20) - (((int32_t)dig_H5) * v_x1)) +
12104404 3:fecb1929cbef 143 ((int32_t)16384)) >> 15) * (((((((v_x1 * (int32_t)dig_H6) >> 10) *
12104404 3:fecb1929cbef 144 (((v_x1 * ((int32_t)dig_H3)) >> 11) + 32768)) >> 10) + 2097152) *
12104404 3:fecb1929cbef 145 (int32_t)dig_H2 + 8192) >> 14));
12104404 3:fecb1929cbef 146 v_x1 = (v_x1 - (((((v_x1 >> 15) * (v_x1 >> 15)) >> 7) * (int32_t)dig_H1) >> 4));
12104404 3:fecb1929cbef 147 v_x1 = (v_x1 < 0 ? 0 : v_x1);
12104404 3:fecb1929cbef 148 v_x1 = (v_x1 > 419430400 ? 419430400 : v_x1);
12104404 3:fecb1929cbef 149
12104404 3:fecb1929cbef 150 humf = (float)(v_x1 >> 12);
12104404 3:fecb1929cbef 151
12104404 3:fecb1929cbef 152 return (humf/1024.0f);
12104404 3:fecb1929cbef 153 }