My trial of BME280 library, tested with Adafruit BME280 module
BME280.cpp@1:7b525853bad0, 2017-05-10 (annotated)
- Committer:
- Rhyme
- Date:
- Wed May 10 09:11:01 2017 +0000
- Revision:
- 1:7b525853bad0
- Parent:
- 0:5ace1cc7a9f2
First working version
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Rhyme | 0:5ace1cc7a9f2 | 1 | #include "mbed.h" |
Rhyme | 0:5ace1cc7a9f2 | 2 | #include "BME280.h" |
Rhyme | 0:5ace1cc7a9f2 | 3 | |
Rhyme | 0:5ace1cc7a9f2 | 4 | /* internal registers */ |
Rhyme | 0:5ace1cc7a9f2 | 5 | #define REG_HUM_LSB 0xFE |
Rhyme | 0:5ace1cc7a9f2 | 6 | #define REG_HUM_MSB 0xFD |
Rhyme | 0:5ace1cc7a9f2 | 7 | #define REG_TEMP_XLSB 0xFC |
Rhyme | 0:5ace1cc7a9f2 | 8 | #define REG_TEMP_LSB 0xFB |
Rhyme | 0:5ace1cc7a9f2 | 9 | #define REG_TEMP_MSB 0xFA |
Rhyme | 0:5ace1cc7a9f2 | 10 | #define REG_PRESS_XLSB 0xF9 |
Rhyme | 0:5ace1cc7a9f2 | 11 | #define REG_PRESS_LSB 0xF8 |
Rhyme | 0:5ace1cc7a9f2 | 12 | #define REG_PRESS_MSB 0xF7 |
Rhyme | 0:5ace1cc7a9f2 | 13 | #define REG_CONFIG 0xF5 |
Rhyme | 0:5ace1cc7a9f2 | 14 | #define REG_CTRL_MEAS 0xF4 |
Rhyme | 0:5ace1cc7a9f2 | 15 | #define REG_STATUS 0xF3 |
Rhyme | 0:5ace1cc7a9f2 | 16 | #define REG_CTRL_HUM 0xF2 |
Rhyme | 0:5ace1cc7a9f2 | 17 | #define REG_RESET 0xE0 |
Rhyme | 0:5ace1cc7a9f2 | 18 | #define REG_ID 0xD0 |
Rhyme | 0:5ace1cc7a9f2 | 19 | |
Rhyme | 0:5ace1cc7a9f2 | 20 | #define REG_CALIB00 0x88 |
Rhyme | 0:5ace1cc7a9f2 | 21 | #define REG_CALIB25 0xA1 |
Rhyme | 0:5ace1cc7a9f2 | 22 | #define REG_CALIB26 0xE1 |
Rhyme | 0:5ace1cc7a9f2 | 23 | #define REG_CALIB41 0xF0 |
Rhyme | 0:5ace1cc7a9f2 | 24 | |
Rhyme | 0:5ace1cc7a9f2 | 25 | /** Trimming parameters */ |
Rhyme | 0:5ace1cc7a9f2 | 26 | /* temperature */ |
Rhyme | 0:5ace1cc7a9f2 | 27 | #define REG_T1_LSB 0x88 |
Rhyme | 0:5ace1cc7a9f2 | 28 | #define REG_T1_MSB 0x89 |
Rhyme | 0:5ace1cc7a9f2 | 29 | #define REG_T2_LSB 0x8A |
Rhyme | 0:5ace1cc7a9f2 | 30 | #define REG_T2_MSB 0x8B |
Rhyme | 0:5ace1cc7a9f2 | 31 | #define REG_T3_LSB 0x8C |
Rhyme | 0:5ace1cc7a9f2 | 32 | #define REG_T3_MSB 0x8D |
Rhyme | 0:5ace1cc7a9f2 | 33 | /* pressure */ |
Rhyme | 0:5ace1cc7a9f2 | 34 | #define REG_P1_LSB 0x8E |
Rhyme | 0:5ace1cc7a9f2 | 35 | #define REG_P1_MSB 0x8F |
Rhyme | 0:5ace1cc7a9f2 | 36 | #define REG_P2_LSB 0x90 |
Rhyme | 0:5ace1cc7a9f2 | 37 | #define REG_P2_MSB 0x91 |
Rhyme | 0:5ace1cc7a9f2 | 38 | #define REG_P3_LSB 0x92 |
Rhyme | 0:5ace1cc7a9f2 | 39 | #define REG_P3_MSB 0x93 |
Rhyme | 0:5ace1cc7a9f2 | 40 | #define REG_P4_LSB 0x94 |
Rhyme | 0:5ace1cc7a9f2 | 41 | #define REG_P4_MSB 0x95 |
Rhyme | 0:5ace1cc7a9f2 | 42 | #define REG_P5_LSB 0x96 |
Rhyme | 0:5ace1cc7a9f2 | 43 | #define REG_P5_MSB 0x97 |
Rhyme | 0:5ace1cc7a9f2 | 44 | #define REG_P6_LSB 0x98 |
Rhyme | 0:5ace1cc7a9f2 | 45 | #define REG_P6_MSB 0x99 |
Rhyme | 0:5ace1cc7a9f2 | 46 | #define REG_P7_LSB 0x9A |
Rhyme | 0:5ace1cc7a9f2 | 47 | #define REG_P7_MSB 0x9B |
Rhyme | 0:5ace1cc7a9f2 | 48 | #define REG_P8_LSB 0x9C |
Rhyme | 0:5ace1cc7a9f2 | 49 | #define REG_P8_MSB 0x9D |
Rhyme | 0:5ace1cc7a9f2 | 50 | #define REG_P9_LSB 0x9E |
Rhyme | 0:5ace1cc7a9f2 | 51 | #define REG_P9_MSB 0x9F |
Rhyme | 0:5ace1cc7a9f2 | 52 | /* humidity */ |
Rhyme | 0:5ace1cc7a9f2 | 53 | #define REG_H1 0xA1 |
Rhyme | 0:5ace1cc7a9f2 | 54 | #define REG_H2_LSB 0xE1 |
Rhyme | 0:5ace1cc7a9f2 | 55 | #define REG_H2_MSB 0xE2 |
Rhyme | 0:5ace1cc7a9f2 | 56 | #define REG_H3 0xE3 |
Rhyme | 1:7b525853bad0 | 57 | #define REG_H4 0xE4 |
Rhyme | 1:7b525853bad0 | 58 | #define REG_H5 0xE5 |
Rhyme | 1:7b525853bad0 | 59 | #define REG_H6 0xE7 |
Rhyme | 0:5ace1cc7a9f2 | 60 | |
Rhyme | 0:5ace1cc7a9f2 | 61 | /* |
Rhyme | 0:5ace1cc7a9f2 | 62 | * Register description |
Rhyme | 0:5ace1cc7a9f2 | 63 | * 0xD0 "id" |
Rhyme | 0:5ace1cc7a9f2 | 64 | * chip identification number chip_id[7:0], which is 0x60 |
Rhyme | 0:5ace1cc7a9f2 | 65 | * |
Rhyme | 0:5ace1cc7a9f2 | 66 | * 0xE0 "reset" |
Rhyme | 0:5ace1cc7a9f2 | 67 | * Software reset register, writing 0xB6 causes complete power-on-reset. |
Rhyme | 0:5ace1cc7a9f2 | 68 | * |
Rhyme | 0:5ace1cc7a9f2 | 69 | * 0xF2 "ctrl_hum" |
Rhyme | 0:5ace1cc7a9f2 | 70 | * Specifies the humidity data acquision options. |
Rhyme | 0:5ace1cc7a9f2 | 71 | * Note: Changes to this register only become effective after a write |
Rhyme | 0:5ace1cc7a9f2 | 72 | * operaion to "ctrl_meas". |
Rhyme | 0:5ace1cc7a9f2 | 73 | * bit[2:0] osrs_h[2:0] Controls oversampling of humidity data. |
Rhyme | 0:5ace1cc7a9f2 | 74 | * 000: Skipped (output set to 0x8000) |
Rhyme | 0:5ace1cc7a9f2 | 75 | * 001: oversampling x1 |
Rhyme | 0:5ace1cc7a9f2 | 76 | * 010: oversampling x2 |
Rhyme | 0:5ace1cc7a9f2 | 77 | * 011: oversampling x4 |
Rhyme | 0:5ace1cc7a9f2 | 78 | * 100: oversampling x8 |
Rhyme | 0:5ace1cc7a9f2 | 79 | * 101, others, oversampling x16 |
Rhyme | 0:5ace1cc7a9f2 | 80 | * |
Rhyme | 0:5ace1cc7a9f2 | 81 | * 0xF3 "status" |
Rhyme | 0:5ace1cc7a9f2 | 82 | * bit[3] measuring[0] Automatically set to '1' during conversion |
Rhyme | 0:5ace1cc7a9f2 | 83 | * and back to '0' when done |
Rhyme | 0:5ace1cc7a9f2 | 84 | * bit[0] im_update[0] Automatically set to '1' during NVM data copy |
Rhyme | 0:5ace1cc7a9f2 | 85 | * and back to '0' when done |
Rhyme | 0:5ace1cc7a9f2 | 86 | * |
Rhyme | 0:5ace1cc7a9f2 | 87 | * 0xF4 "ctrl_meas" |
Rhyme | 0:5ace1cc7a9f2 | 88 | * Specifies the pressure and temperature data acquision options. |
Rhyme | 0:5ace1cc7a9f2 | 89 | * Note: This register needs to be written after canging "ctrl_hum" to take effect. |
Rhyme | 0:5ace1cc7a9f2 | 90 | * bit[7:5] osrs_t[2:0] Controls oversampling of temperature data |
Rhyme | 0:5ace1cc7a9f2 | 91 | * bit value is similar to osrs_h (except 000 output set to 0x80000) |
Rhyme | 0:5ace1cc7a9f2 | 92 | * bit[4:2] osrs_p[2:0] Controls oversampling of pressure data |
Rhyme | 0:5ace1cc7a9f2 | 93 | * bit value is similar to osrs_h (except 000 output set to 0x80000) |
Rhyme | 0:5ace1cc7a9f2 | 94 | * bit[1:0] mode[1:0] Controls the sensor mode. |
Rhyme | 0:5ace1cc7a9f2 | 95 | * 00: Sleep mode |
Rhyme | 0:5ace1cc7a9f2 | 96 | * 01: Forced mode |
Rhyme | 0:5ace1cc7a9f2 | 97 | * 10: Forced mode |
Rhyme | 0:5ace1cc7a9f2 | 98 | * 11: Normal mode |
Rhyme | 0:5ace1cc7a9f2 | 99 | * |
Rhyme | 0:5ace1cc7a9f2 | 100 | * 0xF5 "config" |
Rhyme | 0:5ace1cc7a9f2 | 101 | * Specifies the rate, filter and interface options. |
Rhyme | 0:5ace1cc7a9f2 | 102 | * Writes to "config" in normal mode may be ignored. |
Rhyme | 0:5ace1cc7a9f2 | 103 | * In sleep mode writes are not ignored. |
Rhyme | 0:5ace1cc7a9f2 | 104 | * bit[7:5] t_sb[2:0] Controls inactive duration t_standby in normal mode. |
Rhyme | 0:5ace1cc7a9f2 | 105 | * 000: 0.5 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 106 | * 001: 62.5 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 107 | * 010: 125 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 108 | * 011: 250 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 109 | * 100: 500 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 110 | * 101: 1000 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 111 | * 110: 10 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 112 | * 111: 20 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 113 | * bit[4:2] filter[2:0] Controls the time constant of the IIR filter. |
Rhyme | 0:5ace1cc7a9f2 | 114 | * 000: Filter off |
Rhyme | 0:5ace1cc7a9f2 | 115 | * 001: 2 |
Rhyme | 0:5ace1cc7a9f2 | 116 | * 010: 4 |
Rhyme | 0:5ace1cc7a9f2 | 117 | * 011: 8 |
Rhyme | 0:5ace1cc7a9f2 | 118 | * 100, others: 16 |
Rhyme | 0:5ace1cc7a9f2 | 119 | * |
Rhyme | 0:5ace1cc7a9f2 | 120 | * 0xF7 .. 0xF9 "press" (_msb, _lsb, _xlsb) |
Rhyme | 0:5ace1cc7a9f2 | 121 | * 0xF7 bit[7:0] press_msb[7:0] MSB part up[19:12] |
Rhyme | 0:5ace1cc7a9f2 | 122 | * 0xF8 bit[7:0] press_lsb[7:0] LSB part up[11:4] |
Rhyme | 0:5ace1cc7a9f2 | 123 | * 0xF9 bit[7:4] press_xlsb[3:0] XLSB part up[3:0] |
Rhyme | 0:5ace1cc7a9f2 | 124 | * |
Rhyme | 0:5ace1cc7a9f2 | 125 | * 0xFA .. 0xFC "temp" (_msb, _lsb, _xlsb) |
Rhyme | 0:5ace1cc7a9f2 | 126 | * 0xFA bit[7:0] temp_msb[7:0] MSB part ut[19:12] |
Rhyme | 0:5ace1cc7a9f2 | 127 | * 0xFB bit[7:0] temp_lsb[7:0] LSB part ut[11:4] |
Rhyme | 0:5ace1cc7a9f2 | 128 | * 0xFC bit[7:4] temp_xlsp[3:0] XLSB part ut[3:0] |
Rhyme | 0:5ace1cc7a9f2 | 129 | * |
Rhyme | 0:5ace1cc7a9f2 | 130 | * 0xFD .. 0xFE "hum" (_msb, _lsb) |
Rhyme | 0:5ace1cc7a9f2 | 131 | * 0xFD bit[7:0] hum_msb[7:0] MSB part uh[15:8] |
Rhyme | 0:5ace1cc7a9f2 | 132 | * 0xFE bit[7:0] hum_lsb[7:0] LSB part uh[7:0] |
Rhyme | 0:5ace1cc7a9f2 | 133 | */ |
Rhyme | 1:7b525853bad0 | 134 | /* |
Rhyme | 1:7b525853bad0 | 135 | * Compensation parameter storage, naming and data type |
Rhyme | 1:7b525853bad0 | 136 | * Register addr, Register content, Data type |
Rhyme | 1:7b525853bad0 | 137 | * 0x88/0x89, dig_T1[7:0]/[15:8], unsigned short |
Rhyme | 1:7b525853bad0 | 138 | * 0x8A/0x8B, dig_T2[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 139 | * 0x8C/0x8D, dig_T3[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 140 | * 0x8E/0x8F, dig_P1[7:0]/[15:8], unsigned short |
Rhyme | 1:7b525853bad0 | 141 | * 0x90/0x91, dig_P2[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 142 | * 0x92/0x93, dig_P3[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 143 | * 0x94/0x95, dig_P4[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 144 | * 0x96/0x97, dig_P5[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 145 | * 0x98/0x99, dig_P6[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 146 | * 0x9A/0x9B, dig_P7[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 147 | * 0x9C/0x9D, dig_P8[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 148 | * 0x9E/0x9F, dig_P9[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 149 | * 0xA1, dig_H1[7:0], unsigned char |
Rhyme | 1:7b525853bad0 | 150 | * 0xE1/0xE2, dig_H2[7:0]/[15:8], signed short |
Rhyme | 1:7b525853bad0 | 151 | * 0xE3, dig_H3[7:0], unsigned char |
Rhyme | 1:7b525853bad0 | 152 | * 0xE4/0xE5[3:0], dig_H4[11:4]/[3:0] signed short |
Rhyme | 1:7b525853bad0 | 153 | * 0xE5[7:4]/0xE6, dig_H5[3:0]/[11:4] signed short |
Rhyme | 1:7b525853bad0 | 154 | * 0xE7, dig_H6[7:0], signed char |
Rhyme | 1:7b525853bad0 | 155 | */ |
Rhyme | 0:5ace1cc7a9f2 | 156 | |
Rhyme | 0:5ace1cc7a9f2 | 157 | void BME280::init(void) |
Rhyme | 0:5ace1cc7a9f2 | 158 | { |
Rhyme | 0:5ace1cc7a9f2 | 159 | uint8_t data[18] ; |
Rhyme | 0:5ace1cc7a9f2 | 160 | |
Rhyme | 0:5ace1cc7a9f2 | 161 | data[0] = REG_CTRL_HUM ; |
Rhyme | 0:5ace1cc7a9f2 | 162 | data[1] = 0x03 ; /* Humidity oversampling x4 */ |
Rhyme | 0:5ace1cc7a9f2 | 163 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 164 | |
Rhyme | 0:5ace1cc7a9f2 | 165 | data[0] = REG_CTRL_MEAS ; |
Rhyme | 0:5ace1cc7a9f2 | 166 | data[1] = (0x3 << 5) /* temp oversample x4 */ |
Rhyme | 1:7b525853bad0 | 167 | | (0x3 << 2) /* pres oversample x4 */ |
Rhyme | 0:5ace1cc7a9f2 | 168 | | (0x00) /* Sleep Mode */ |
Rhyme | 0:5ace1cc7a9f2 | 169 | ; |
Rhyme | 0:5ace1cc7a9f2 | 170 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 171 | |
Rhyme | 0:5ace1cc7a9f2 | 172 | data[0] = REG_CONFIG ; |
Rhyme | 0:5ace1cc7a9f2 | 173 | data[1] = (0x4 << 5) /* standby 500ms */ |
Rhyme | 0:5ace1cc7a9f2 | 174 | | (0x0 << 2) /* filter off */ |
Rhyme | 0:5ace1cc7a9f2 | 175 | | (0x0) /* spi 4wire mode */ |
Rhyme | 0:5ace1cc7a9f2 | 176 | ; |
Rhyme | 0:5ace1cc7a9f2 | 177 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 178 | |
Rhyme | 0:5ace1cc7a9f2 | 179 | /* read dig_T regs */ |
Rhyme | 0:5ace1cc7a9f2 | 180 | readRegs(REG_T1_LSB, data, 6) ; |
Rhyme | 0:5ace1cc7a9f2 | 181 | dig_T1 = (data[1] << 8) | data[0] ; |
Rhyme | 0:5ace1cc7a9f2 | 182 | dig_T2 = (data[3] << 8) | data[2] ; |
Rhyme | 0:5ace1cc7a9f2 | 183 | dig_T3 = (data[5] << 8) | data[4] ; |
Rhyme | 0:5ace1cc7a9f2 | 184 | // printf("dig_T1:0x%04X, dig_T2:0x%04X, dig_T3:0x%04X\n",dig_T1, dig_T2, dig_T3) ; |
Rhyme | 0:5ace1cc7a9f2 | 185 | |
Rhyme | 0:5ace1cc7a9f2 | 186 | /* read dig_P regs */ |
Rhyme | 0:5ace1cc7a9f2 | 187 | readRegs(REG_P1_LSB, data, 18) ; |
Rhyme | 0:5ace1cc7a9f2 | 188 | dig_P1 = (data[ 1] << 8) | data[ 0] ; |
Rhyme | 0:5ace1cc7a9f2 | 189 | dig_P2 = (data[ 3] << 8) | data[ 2] ; |
Rhyme | 0:5ace1cc7a9f2 | 190 | dig_P3 = (data[ 5] << 8) | data[ 4] ; |
Rhyme | 0:5ace1cc7a9f2 | 191 | dig_P4 = (data[ 7] << 8) | data[ 6] ; |
Rhyme | 0:5ace1cc7a9f2 | 192 | dig_P5 = (data[ 9] << 8) | data[ 8] ; |
Rhyme | 0:5ace1cc7a9f2 | 193 | dig_P6 = (data[11] << 8) | data[10] ; |
Rhyme | 0:5ace1cc7a9f2 | 194 | dig_P7 = (data[13] << 8) | data[12] ; |
Rhyme | 0:5ace1cc7a9f2 | 195 | dig_P8 = (data[15] << 8) | data[14] ; |
Rhyme | 0:5ace1cc7a9f2 | 196 | dig_P9 = (data[17] << 8) | data[16] ; |
Rhyme | 0:5ace1cc7a9f2 | 197 | // printf("dig_P1:0x%04X, dig_P2:0x%04X, dig_P3:0x%04X\n",dig_P1, dig_P2, dig_P3) ; |
Rhyme | 0:5ace1cc7a9f2 | 198 | // printf("dig_P4:0x%04X, dig_P5:0x%04X, dig_P6:0x%04X\n",dig_P4, dig_P5, dig_P6) ; |
Rhyme | 0:5ace1cc7a9f2 | 199 | // printf("dig_P7:0x%04X, dig_P8:0x%04X, dig_P9:0x%04X\n",dig_P7, dig_P8, dig_P9) ; |
Rhyme | 0:5ace1cc7a9f2 | 200 | |
Rhyme | 0:5ace1cc7a9f2 | 201 | /* read dig_H regs */ |
Rhyme | 0:5ace1cc7a9f2 | 202 | readRegs(REG_H1, data, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 203 | dig_H1 = data[0] ; |
Rhyme | 1:7b525853bad0 | 204 | readRegs(REG_H2_LSB, data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 205 | dig_H2 = (data[1] << 8) | data[0] ; |
Rhyme | 1:7b525853bad0 | 206 | readRegs(REG_H3, data, 1) ; |
Rhyme | 1:7b525853bad0 | 207 | dig_H3 = data[0] ; |
Rhyme | 1:7b525853bad0 | 208 | readRegs(REG_H4, data, 3) ; |
Rhyme | 1:7b525853bad0 | 209 | dig_H4 = (data[0] << 4) | (data[1] & 0x0F) ; |
Rhyme | 1:7b525853bad0 | 210 | dig_H5 = (data[2] << 4) | (data[1] >> 4) ; |
Rhyme | 1:7b525853bad0 | 211 | readRegs(REG_H6, data, 1) ; |
Rhyme | 1:7b525853bad0 | 212 | dig_H6 = data[0] ; |
Rhyme | 0:5ace1cc7a9f2 | 213 | // printf("dig_H1:0x%04X, dig_H2:0x%04X, dig_H3:0x%04X\n",dig_H1, dig_H2, dig_H3) ; |
Rhyme | 1:7b525853bad0 | 214 | // printf("dig_H4:0x%04X, dig_H5:0x%04X, dig_H6:0x%04X\n",dig_H4, dig_H5, dig_H6) ; |
Rhyme | 1:7b525853bad0 | 215 | |
Rhyme | 1:7b525853bad0 | 216 | trigger() ; /* dummy measure */ |
Rhyme | 0:5ace1cc7a9f2 | 217 | } |
Rhyme | 0:5ace1cc7a9f2 | 218 | |
Rhyme | 0:5ace1cc7a9f2 | 219 | BME280::BME280(PinName sda, PinName scl, int addr) |
Rhyme | 0:5ace1cc7a9f2 | 220 | { |
Rhyme | 0:5ace1cc7a9f2 | 221 | m_i2c = new I2C(sda, scl) ; |
Rhyme | 0:5ace1cc7a9f2 | 222 | m_addr = (addr << 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 223 | m_spi = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 224 | m_cs = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 225 | init() ; |
Rhyme | 0:5ace1cc7a9f2 | 226 | } |
Rhyme | 0:5ace1cc7a9f2 | 227 | |
Rhyme | 0:5ace1cc7a9f2 | 228 | BME280::BME280(PinName sck, PinName miso, PinName mosi, PinName cs) |
Rhyme | 0:5ace1cc7a9f2 | 229 | { |
Rhyme | 0:5ace1cc7a9f2 | 230 | m_cs = new DigitalOut(cs, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 231 | m_spi = new SPI(mosi, miso, sck) ; |
Rhyme | 0:5ace1cc7a9f2 | 232 | m_spi->format(8, 3) ; |
Rhyme | 0:5ace1cc7a9f2 | 233 | m_i2c = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 234 | m_addr = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 235 | init() ; |
Rhyme | 0:5ace1cc7a9f2 | 236 | } |
Rhyme | 0:5ace1cc7a9f2 | 237 | |
Rhyme | 0:5ace1cc7a9f2 | 238 | BME280::~BME280() |
Rhyme | 0:5ace1cc7a9f2 | 239 | { |
Rhyme | 0:5ace1cc7a9f2 | 240 | if (m_spi) { |
Rhyme | 0:5ace1cc7a9f2 | 241 | delete m_spi ; |
Rhyme | 0:5ace1cc7a9f2 | 242 | delete m_cs ; |
Rhyme | 0:5ace1cc7a9f2 | 243 | } |
Rhyme | 0:5ace1cc7a9f2 | 244 | if (m_i2c) { |
Rhyme | 0:5ace1cc7a9f2 | 245 | delete m_i2c ; |
Rhyme | 0:5ace1cc7a9f2 | 246 | m_addr = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 247 | } |
Rhyme | 0:5ace1cc7a9f2 | 248 | } |
Rhyme | 0:5ace1cc7a9f2 | 249 | |
Rhyme | 0:5ace1cc7a9f2 | 250 | void BME280::i2c_readRegs(int addr, uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 251 | char t[1] = {addr} ; |
Rhyme | 0:5ace1cc7a9f2 | 252 | m_i2c->write(m_addr, t, 1, true) ; |
Rhyme | 0:5ace1cc7a9f2 | 253 | m_i2c->read(m_addr, (char*)data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 254 | } |
Rhyme | 0:5ace1cc7a9f2 | 255 | |
Rhyme | 0:5ace1cc7a9f2 | 256 | void BME280::i2c_writeRegs(uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 257 | m_i2c->write(m_addr, (char *)data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 258 | } |
Rhyme | 0:5ace1cc7a9f2 | 259 | |
Rhyme | 0:5ace1cc7a9f2 | 260 | void BME280::spi_readRegs(int addr, uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 261 | *m_cs = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 262 | m_spi->write(addr | 0x80) ; |
Rhyme | 0:5ace1cc7a9f2 | 263 | for (int i = 0 ; i < len ; i++ ) { |
Rhyme | 0:5ace1cc7a9f2 | 264 | data[i] = m_spi->write((addr+i)|0x80) ; |
Rhyme | 0:5ace1cc7a9f2 | 265 | } |
Rhyme | 0:5ace1cc7a9f2 | 266 | m_spi->write(0x00) ; // to terminate read mode |
Rhyme | 0:5ace1cc7a9f2 | 267 | *m_cs = 1 ; |
Rhyme | 0:5ace1cc7a9f2 | 268 | } |
Rhyme | 0:5ace1cc7a9f2 | 269 | |
Rhyme | 0:5ace1cc7a9f2 | 270 | void BME280::spi_writeRegs(uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 271 | *m_cs = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 272 | for (int i = 0 ; i < len-1 ; i++ ) { |
Rhyme | 0:5ace1cc7a9f2 | 273 | m_spi->write((data[0]+i)^0x80) ; /* register address */ |
Rhyme | 0:5ace1cc7a9f2 | 274 | m_spi->write(data[i+1]) ; /* data to write */ |
Rhyme | 0:5ace1cc7a9f2 | 275 | |
Rhyme | 0:5ace1cc7a9f2 | 276 | } |
Rhyme | 0:5ace1cc7a9f2 | 277 | *m_cs = 1 ; |
Rhyme | 0:5ace1cc7a9f2 | 278 | } |
Rhyme | 0:5ace1cc7a9f2 | 279 | |
Rhyme | 0:5ace1cc7a9f2 | 280 | void BME280::readRegs(int addr, uint8_t *data, int len) |
Rhyme | 0:5ace1cc7a9f2 | 281 | { |
Rhyme | 0:5ace1cc7a9f2 | 282 | if (m_spi) { |
Rhyme | 0:5ace1cc7a9f2 | 283 | spi_readRegs(addr, data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 284 | } else if (m_i2c) { |
Rhyme | 0:5ace1cc7a9f2 | 285 | i2c_readRegs(addr, data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 286 | } |
Rhyme | 0:5ace1cc7a9f2 | 287 | } |
Rhyme | 0:5ace1cc7a9f2 | 288 | |
Rhyme | 0:5ace1cc7a9f2 | 289 | void BME280::writeRegs(uint8_t *data, int len) |
Rhyme | 0:5ace1cc7a9f2 | 290 | { |
Rhyme | 0:5ace1cc7a9f2 | 291 | if (m_spi) { |
Rhyme | 0:5ace1cc7a9f2 | 292 | spi_writeRegs(data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 293 | } else if (m_i2c) { |
Rhyme | 0:5ace1cc7a9f2 | 294 | i2c_writeRegs(data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 295 | } |
Rhyme | 0:5ace1cc7a9f2 | 296 | } |
Rhyme | 0:5ace1cc7a9f2 | 297 | |
Rhyme | 0:5ace1cc7a9f2 | 298 | void BME280::reset(void) |
Rhyme | 0:5ace1cc7a9f2 | 299 | { |
Rhyme | 0:5ace1cc7a9f2 | 300 | uint8_t data[2] ; |
Rhyme | 0:5ace1cc7a9f2 | 301 | data[0] = REG_RESET ; |
Rhyme | 0:5ace1cc7a9f2 | 302 | data[1] = 0xB6 ; |
Rhyme | 0:5ace1cc7a9f2 | 303 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 304 | } |
Rhyme | 0:5ace1cc7a9f2 | 305 | |
Rhyme | 0:5ace1cc7a9f2 | 306 | void BME280::trigger(void) |
Rhyme | 0:5ace1cc7a9f2 | 307 | { |
Rhyme | 0:5ace1cc7a9f2 | 308 | uint8_t data[2] ; |
Rhyme | 0:5ace1cc7a9f2 | 309 | readRegs(REG_CTRL_MEAS, &data[1], 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 310 | |
Rhyme | 0:5ace1cc7a9f2 | 311 | data[0] = REG_CTRL_MEAS ; |
Rhyme | 0:5ace1cc7a9f2 | 312 | data[1] = (data[1] & 0xFC) /* keep oversampling */ |
Rhyme | 0:5ace1cc7a9f2 | 313 | | (0x2) /* Forced Mode */ |
Rhyme | 0:5ace1cc7a9f2 | 314 | ; |
Rhyme | 0:5ace1cc7a9f2 | 315 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 316 | } |
Rhyme | 0:5ace1cc7a9f2 | 317 | |
Rhyme | 0:5ace1cc7a9f2 | 318 | uint8_t BME280::busy(void) |
Rhyme | 0:5ace1cc7a9f2 | 319 | { |
Rhyme | 0:5ace1cc7a9f2 | 320 | uint8_t data[1] ; |
Rhyme | 0:5ace1cc7a9f2 | 321 | readRegs(REG_STATUS, data, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 322 | return( data[0] & 0x9 ) ; |
Rhyme | 0:5ace1cc7a9f2 | 323 | } |
Rhyme | 0:5ace1cc7a9f2 | 324 | |
Rhyme | 0:5ace1cc7a9f2 | 325 | uint8_t BME280::getID(void) |
Rhyme | 0:5ace1cc7a9f2 | 326 | { |
Rhyme | 0:5ace1cc7a9f2 | 327 | uint8_t data[1] ; |
Rhyme | 0:5ace1cc7a9f2 | 328 | readRegs(REG_ID, data, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 329 | return(data[0]) ; |
Rhyme | 0:5ace1cc7a9f2 | 330 | } |
Rhyme | 0:5ace1cc7a9f2 | 331 | |
Rhyme | 1:7b525853bad0 | 332 | float BME280::getTemperature(void) |
Rhyme | 0:5ace1cc7a9f2 | 333 | { |
Rhyme | 1:7b525853bad0 | 334 | float tempf ; |
Rhyme | 1:7b525853bad0 | 335 | uint8_t data[3] ; |
Rhyme | 1:7b525853bad0 | 336 | BME280_S32_t var1, var2, T ; |
Rhyme | 1:7b525853bad0 | 337 | BME280_S32_t adc_T ; |
Rhyme | 1:7b525853bad0 | 338 | |
Rhyme | 1:7b525853bad0 | 339 | readRegs(REG_TEMP_MSB, data, 3) ; |
Rhyme | 1:7b525853bad0 | 340 | adc_T = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4); |
Rhyme | 1:7b525853bad0 | 341 | |
Rhyme | 1:7b525853bad0 | 342 | var1 = ((((adc_T>>3) - ((BME280_S32_t)dig_T1<<1))) * ((BME280_S32_t)dig_T2)) >> 11; |
Rhyme | 1:7b525853bad0 | 343 | var2 = (((((adc_T>>4) - ((BME280_S32_t)dig_T1)) * ((adc_T>>4) - ((BME280_S32_t)dig_T1))) >> 12) * |
Rhyme | 1:7b525853bad0 | 344 | ((BME280_S32_t)dig_T3)) >> 14; |
Rhyme | 1:7b525853bad0 | 345 | t_fine = var1 + var2; |
Rhyme | 1:7b525853bad0 | 346 | T = (t_fine * 5 + 128) >> 8; |
Rhyme | 1:7b525853bad0 | 347 | |
Rhyme | 1:7b525853bad0 | 348 | tempf = (float)T; |
Rhyme | 0:5ace1cc7a9f2 | 349 | return (tempf/100.0f); |
Rhyme | 0:5ace1cc7a9f2 | 350 | } |
Rhyme | 0:5ace1cc7a9f2 | 351 | |
Rhyme | 1:7b525853bad0 | 352 | float BME280::getPressure(void) |
Rhyme | 0:5ace1cc7a9f2 | 353 | { |
Rhyme | 1:7b525853bad0 | 354 | BME280_S32_t adc_P ; |
Rhyme | 1:7b525853bad0 | 355 | BME280_S64_t var1, var2, p ; |
Rhyme | 1:7b525853bad0 | 356 | float pressf; |
Rhyme | 1:7b525853bad0 | 357 | uint8_t data[3]; |
Rhyme | 0:5ace1cc7a9f2 | 358 | |
Rhyme | 1:7b525853bad0 | 359 | readRegs(REG_PRESS_MSB, data, 3) ; |
Rhyme | 1:7b525853bad0 | 360 | adc_P = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4); |
Rhyme | 0:5ace1cc7a9f2 | 361 | |
Rhyme | 1:7b525853bad0 | 362 | var1 = ((BME280_S64_t)t_fine) - 128000; |
Rhyme | 1:7b525853bad0 | 363 | var2 = var1 * var1 * (BME280_S64_t)dig_P6; |
Rhyme | 1:7b525853bad0 | 364 | var2 = var2 + ((var1*(BME280_S64_t)dig_P5)<<17); |
Rhyme | 1:7b525853bad0 | 365 | var2 = var2 + (((BME280_S64_t)dig_P4)<<35); |
Rhyme | 1:7b525853bad0 | 366 | var1 = ((var1 * var1 * (BME280_S64_t)dig_P3)>>8) + ((var1 * (BME280_S64_t)dig_P2)<<12); |
Rhyme | 1:7b525853bad0 | 367 | var1 = (((((BME280_S64_t)1)<<47)+var1))*((BME280_S64_t)dig_P1)>>33; |
Rhyme | 1:7b525853bad0 | 368 | if (var1 == 0) { |
Rhyme | 1:7b525853bad0 | 369 | return 0; // avoid exception caused by division by zero |
Rhyme | 1:7b525853bad0 | 370 | } |
Rhyme | 1:7b525853bad0 | 371 | p = 1048576-adc_P; |
Rhyme | 1:7b525853bad0 | 372 | p = (((p<<31)-var2)*3125)/var1; |
Rhyme | 1:7b525853bad0 | 373 | var1 = (((BME280_S64_t)dig_P9) * (p>>13) * (p>>13)) >> 25; |
Rhyme | 1:7b525853bad0 | 374 | var2 = (((BME280_S64_t)dig_P8) * p) >> 19; |
Rhyme | 1:7b525853bad0 | 375 | p = ((p + var1 + var2) >> 8) + (((BME280_S64_t)dig_P7)<<4); |
Rhyme | 0:5ace1cc7a9f2 | 376 | |
Rhyme | 1:7b525853bad0 | 377 | pressf = (float)(p >> 8) ; |
Rhyme | 1:7b525853bad0 | 378 | return (pressf/100.0f); |
Rhyme | 0:5ace1cc7a9f2 | 379 | } |
Rhyme | 0:5ace1cc7a9f2 | 380 | |
Rhyme | 1:7b525853bad0 | 381 | float BME280::getHumidity(void) |
Rhyme | 0:5ace1cc7a9f2 | 382 | { |
Rhyme | 1:7b525853bad0 | 383 | BME280_S32_t adc_H; |
Rhyme | 1:7b525853bad0 | 384 | BME280_S32_t v_x1_u32r ; |
Rhyme | 1:7b525853bad0 | 385 | float humf; |
Rhyme | 1:7b525853bad0 | 386 | uint8_t data[2]; |
Rhyme | 0:5ace1cc7a9f2 | 387 | |
Rhyme | 1:7b525853bad0 | 388 | readRegs(REG_HUM_MSB, data, 2) ; |
Rhyme | 1:7b525853bad0 | 389 | adc_H = (data[0] << 8) | data[1]; |
Rhyme | 0:5ace1cc7a9f2 | 390 | |
Rhyme | 1:7b525853bad0 | 391 | v_x1_u32r = (t_fine - ((BME280_S32_t)76800)); |
Rhyme | 1:7b525853bad0 | 392 | v_x1_u32r = (((((adc_H << 14) - (((BME280_S32_t)dig_H4) << 20) - (((BME280_S32_t)dig_H5) * v_x1_u32r)) + |
Rhyme | 1:7b525853bad0 | 393 | ((BME280_S32_t)16384)) >> 15) * (((((((v_x1_u32r * ((BME280_S32_t)dig_H6)) >> 10) * (((v_x1_u32r * |
Rhyme | 1:7b525853bad0 | 394 | ((BME280_S32_t)dig_H3)) >> 11) + ((BME280_S32_t)32768))) >> 10) + ((BME280_S32_t)2097152)) * |
Rhyme | 1:7b525853bad0 | 395 | ((BME280_S32_t)dig_H2) + 8192) >> 14)); |
Rhyme | 1:7b525853bad0 | 396 | v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((BME280_S32_t)dig_H1)) >> 4)); |
Rhyme | 1:7b525853bad0 | 397 | v_x1_u32r = (v_x1_u32r < 0 ? 0 : v_x1_u32r); |
Rhyme | 1:7b525853bad0 | 398 | v_x1_u32r = (v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r); |
Rhyme | 1:7b525853bad0 | 399 | humf = (float)(v_x1_u32r >> 12) ; |
Rhyme | 1:7b525853bad0 | 400 | |
Rhyme | 1:7b525853bad0 | 401 | return (humf/1024.0f); |
Rhyme | 0:5ace1cc7a9f2 | 402 | } |