My trial of BME280 library, tested with Adafruit BME280 module
BME280.cpp@0:5ace1cc7a9f2, 2017-05-09 (annotated)
- Committer:
- Rhyme
- Date:
- Tue May 09 06:32:36 2017 +0000
- Revision:
- 0:5ace1cc7a9f2
- Child:
- 1:7b525853bad0
spi read/write started working
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 | 0:5ace1cc7a9f2 | 57 | |
Rhyme | 0:5ace1cc7a9f2 | 58 | |
Rhyme | 0:5ace1cc7a9f2 | 59 | /* |
Rhyme | 0:5ace1cc7a9f2 | 60 | * Register description |
Rhyme | 0:5ace1cc7a9f2 | 61 | * 0xD0 "id" |
Rhyme | 0:5ace1cc7a9f2 | 62 | * chip identification number chip_id[7:0], which is 0x60 |
Rhyme | 0:5ace1cc7a9f2 | 63 | * |
Rhyme | 0:5ace1cc7a9f2 | 64 | * 0xE0 "reset" |
Rhyme | 0:5ace1cc7a9f2 | 65 | * Software reset register, writing 0xB6 causes complete power-on-reset. |
Rhyme | 0:5ace1cc7a9f2 | 66 | * |
Rhyme | 0:5ace1cc7a9f2 | 67 | * 0xF2 "ctrl_hum" |
Rhyme | 0:5ace1cc7a9f2 | 68 | * Specifies the humidity data acquision options. |
Rhyme | 0:5ace1cc7a9f2 | 69 | * Note: Changes to this register only become effective after a write |
Rhyme | 0:5ace1cc7a9f2 | 70 | * operaion to "ctrl_meas". |
Rhyme | 0:5ace1cc7a9f2 | 71 | * bit[2:0] osrs_h[2:0] Controls oversampling of humidity data. |
Rhyme | 0:5ace1cc7a9f2 | 72 | * 000: Skipped (output set to 0x8000) |
Rhyme | 0:5ace1cc7a9f2 | 73 | * 001: oversampling x1 |
Rhyme | 0:5ace1cc7a9f2 | 74 | * 010: oversampling x2 |
Rhyme | 0:5ace1cc7a9f2 | 75 | * 011: oversampling x4 |
Rhyme | 0:5ace1cc7a9f2 | 76 | * 100: oversampling x8 |
Rhyme | 0:5ace1cc7a9f2 | 77 | * 101, others, oversampling x16 |
Rhyme | 0:5ace1cc7a9f2 | 78 | * |
Rhyme | 0:5ace1cc7a9f2 | 79 | * 0xF3 "status" |
Rhyme | 0:5ace1cc7a9f2 | 80 | * bit[3] measuring[0] Automatically set to '1' during conversion |
Rhyme | 0:5ace1cc7a9f2 | 81 | * and back to '0' when done |
Rhyme | 0:5ace1cc7a9f2 | 82 | * bit[0] im_update[0] Automatically set to '1' during NVM data copy |
Rhyme | 0:5ace1cc7a9f2 | 83 | * and back to '0' when done |
Rhyme | 0:5ace1cc7a9f2 | 84 | * |
Rhyme | 0:5ace1cc7a9f2 | 85 | * 0xF4 "ctrl_meas" |
Rhyme | 0:5ace1cc7a9f2 | 86 | * Specifies the pressure and temperature data acquision options. |
Rhyme | 0:5ace1cc7a9f2 | 87 | * Note: This register needs to be written after canging "ctrl_hum" to take effect. |
Rhyme | 0:5ace1cc7a9f2 | 88 | * bit[7:5] osrs_t[2:0] Controls oversampling of temperature data |
Rhyme | 0:5ace1cc7a9f2 | 89 | * bit value is similar to osrs_h (except 000 output set to 0x80000) |
Rhyme | 0:5ace1cc7a9f2 | 90 | * bit[4:2] osrs_p[2:0] Controls oversampling of pressure data |
Rhyme | 0:5ace1cc7a9f2 | 91 | * bit value is similar to osrs_h (except 000 output set to 0x80000) |
Rhyme | 0:5ace1cc7a9f2 | 92 | * bit[1:0] mode[1:0] Controls the sensor mode. |
Rhyme | 0:5ace1cc7a9f2 | 93 | * 00: Sleep mode |
Rhyme | 0:5ace1cc7a9f2 | 94 | * 01: Forced mode |
Rhyme | 0:5ace1cc7a9f2 | 95 | * 10: Forced mode |
Rhyme | 0:5ace1cc7a9f2 | 96 | * 11: Normal mode |
Rhyme | 0:5ace1cc7a9f2 | 97 | * |
Rhyme | 0:5ace1cc7a9f2 | 98 | * 0xF5 "config" |
Rhyme | 0:5ace1cc7a9f2 | 99 | * Specifies the rate, filter and interface options. |
Rhyme | 0:5ace1cc7a9f2 | 100 | * Writes to "config" in normal mode may be ignored. |
Rhyme | 0:5ace1cc7a9f2 | 101 | * In sleep mode writes are not ignored. |
Rhyme | 0:5ace1cc7a9f2 | 102 | * bit[7:5] t_sb[2:0] Controls inactive duration t_standby in normal mode. |
Rhyme | 0:5ace1cc7a9f2 | 103 | * 000: 0.5 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 104 | * 001: 62.5 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 105 | * 010: 125 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 106 | * 011: 250 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 107 | * 100: 500 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 108 | * 101: 1000 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 109 | * 110: 10 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 110 | * 111: 20 [ms] |
Rhyme | 0:5ace1cc7a9f2 | 111 | * bit[4:2] filter[2:0] Controls the time constant of the IIR filter. |
Rhyme | 0:5ace1cc7a9f2 | 112 | * 000: Filter off |
Rhyme | 0:5ace1cc7a9f2 | 113 | * 001: 2 |
Rhyme | 0:5ace1cc7a9f2 | 114 | * 010: 4 |
Rhyme | 0:5ace1cc7a9f2 | 115 | * 011: 8 |
Rhyme | 0:5ace1cc7a9f2 | 116 | * 100, others: 16 |
Rhyme | 0:5ace1cc7a9f2 | 117 | * |
Rhyme | 0:5ace1cc7a9f2 | 118 | * 0xF7 .. 0xF9 "press" (_msb, _lsb, _xlsb) |
Rhyme | 0:5ace1cc7a9f2 | 119 | * 0xF7 bit[7:0] press_msb[7:0] MSB part up[19:12] |
Rhyme | 0:5ace1cc7a9f2 | 120 | * 0xF8 bit[7:0] press_lsb[7:0] LSB part up[11:4] |
Rhyme | 0:5ace1cc7a9f2 | 121 | * 0xF9 bit[7:4] press_xlsb[3:0] XLSB part up[3:0] |
Rhyme | 0:5ace1cc7a9f2 | 122 | * |
Rhyme | 0:5ace1cc7a9f2 | 123 | * 0xFA .. 0xFC "temp" (_msb, _lsb, _xlsb) |
Rhyme | 0:5ace1cc7a9f2 | 124 | * 0xFA bit[7:0] temp_msb[7:0] MSB part ut[19:12] |
Rhyme | 0:5ace1cc7a9f2 | 125 | * 0xFB bit[7:0] temp_lsb[7:0] LSB part ut[11:4] |
Rhyme | 0:5ace1cc7a9f2 | 126 | * 0xFC bit[7:4] temp_xlsp[3:0] XLSB part ut[3:0] |
Rhyme | 0:5ace1cc7a9f2 | 127 | * |
Rhyme | 0:5ace1cc7a9f2 | 128 | * 0xFD .. 0xFE "hum" (_msb, _lsb) |
Rhyme | 0:5ace1cc7a9f2 | 129 | * 0xFD bit[7:0] hum_msb[7:0] MSB part uh[15:8] |
Rhyme | 0:5ace1cc7a9f2 | 130 | * 0xFE bit[7:0] hum_lsb[7:0] LSB part uh[7:0] |
Rhyme | 0:5ace1cc7a9f2 | 131 | */ |
Rhyme | 0:5ace1cc7a9f2 | 132 | |
Rhyme | 0:5ace1cc7a9f2 | 133 | void BME280::init(void) |
Rhyme | 0:5ace1cc7a9f2 | 134 | { |
Rhyme | 0:5ace1cc7a9f2 | 135 | uint8_t data[18] ; |
Rhyme | 0:5ace1cc7a9f2 | 136 | |
Rhyme | 0:5ace1cc7a9f2 | 137 | data[0] = REG_CTRL_HUM ; |
Rhyme | 0:5ace1cc7a9f2 | 138 | data[1] = 0x03 ; /* Humidity oversampling x4 */ |
Rhyme | 0:5ace1cc7a9f2 | 139 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 140 | |
Rhyme | 0:5ace1cc7a9f2 | 141 | data[0] = REG_CTRL_MEAS ; |
Rhyme | 0:5ace1cc7a9f2 | 142 | data[1] = (0x3 << 5) /* temp oversample x4 */ |
Rhyme | 0:5ace1cc7a9f2 | 143 | | (0x3 << 3) /* pres oversample x4 */ |
Rhyme | 0:5ace1cc7a9f2 | 144 | | (0x00) /* Sleep Mode */ |
Rhyme | 0:5ace1cc7a9f2 | 145 | ; |
Rhyme | 0:5ace1cc7a9f2 | 146 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 147 | readRegs(REG_CTRL_MEAS, data, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 148 | printf("ctrl_meas: 0x%02X\n", data[0]) ; |
Rhyme | 0:5ace1cc7a9f2 | 149 | |
Rhyme | 0:5ace1cc7a9f2 | 150 | data[0] = REG_CONFIG ; |
Rhyme | 0:5ace1cc7a9f2 | 151 | data[1] = (0x4 << 5) /* standby 500ms */ |
Rhyme | 0:5ace1cc7a9f2 | 152 | | (0x0 << 2) /* filter off */ |
Rhyme | 0:5ace1cc7a9f2 | 153 | | (0x0) /* spi 4wire mode */ |
Rhyme | 0:5ace1cc7a9f2 | 154 | ; |
Rhyme | 0:5ace1cc7a9f2 | 155 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 156 | |
Rhyme | 0:5ace1cc7a9f2 | 157 | /* read dig_T regs */ |
Rhyme | 0:5ace1cc7a9f2 | 158 | readRegs(REG_T1_LSB, data, 6) ; |
Rhyme | 0:5ace1cc7a9f2 | 159 | dig_T1 = (data[1] << 8) | data[0] ; |
Rhyme | 0:5ace1cc7a9f2 | 160 | dig_T2 = (data[3] << 8) | data[2] ; |
Rhyme | 0:5ace1cc7a9f2 | 161 | dig_T3 = (data[5] << 8) | data[4] ; |
Rhyme | 0:5ace1cc7a9f2 | 162 | // printf("dig_T1:0x%04X, dig_T2:0x%04X, dig_T3:0x%04X\n",dig_T1, dig_T2, dig_T3) ; |
Rhyme | 0:5ace1cc7a9f2 | 163 | |
Rhyme | 0:5ace1cc7a9f2 | 164 | /* read dig_P regs */ |
Rhyme | 0:5ace1cc7a9f2 | 165 | readRegs(REG_P1_LSB, data, 18) ; |
Rhyme | 0:5ace1cc7a9f2 | 166 | dig_P1 = (data[ 1] << 8) | data[ 0] ; |
Rhyme | 0:5ace1cc7a9f2 | 167 | dig_P2 = (data[ 3] << 8) | data[ 2] ; |
Rhyme | 0:5ace1cc7a9f2 | 168 | dig_P3 = (data[ 5] << 8) | data[ 4] ; |
Rhyme | 0:5ace1cc7a9f2 | 169 | dig_P4 = (data[ 7] << 8) | data[ 6] ; |
Rhyme | 0:5ace1cc7a9f2 | 170 | dig_P5 = (data[ 9] << 8) | data[ 8] ; |
Rhyme | 0:5ace1cc7a9f2 | 171 | dig_P6 = (data[11] << 8) | data[10] ; |
Rhyme | 0:5ace1cc7a9f2 | 172 | dig_P7 = (data[13] << 8) | data[12] ; |
Rhyme | 0:5ace1cc7a9f2 | 173 | dig_P8 = (data[15] << 8) | data[14] ; |
Rhyme | 0:5ace1cc7a9f2 | 174 | dig_P9 = (data[17] << 8) | data[16] ; |
Rhyme | 0:5ace1cc7a9f2 | 175 | // printf("dig_P1:0x%04X, dig_P2:0x%04X, dig_P3:0x%04X\n",dig_P1, dig_P2, dig_P3) ; |
Rhyme | 0:5ace1cc7a9f2 | 176 | // printf("dig_P4:0x%04X, dig_P5:0x%04X, dig_P6:0x%04X\n",dig_P4, dig_P5, dig_P6) ; |
Rhyme | 0:5ace1cc7a9f2 | 177 | // printf("dig_P7:0x%04X, dig_P8:0x%04X, dig_P9:0x%04X\n",dig_P7, dig_P8, dig_P9) ; |
Rhyme | 0:5ace1cc7a9f2 | 178 | |
Rhyme | 0:5ace1cc7a9f2 | 179 | /* read dig_H regs */ |
Rhyme | 0:5ace1cc7a9f2 | 180 | readRegs(REG_H1, data, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 181 | dig_H1 = data[0] ; |
Rhyme | 0:5ace1cc7a9f2 | 182 | readRegs(REG_H2_LSB, data, 3) ; |
Rhyme | 0:5ace1cc7a9f2 | 183 | dig_H2 = (data[1] << 8) | data[0] ; |
Rhyme | 0:5ace1cc7a9f2 | 184 | dig_H3 = data[2] ; |
Rhyme | 0:5ace1cc7a9f2 | 185 | // printf("dig_H1:0x%04X, dig_H2:0x%04X, dig_H3:0x%04X\n",dig_H1, dig_H2, dig_H3) ; |
Rhyme | 0:5ace1cc7a9f2 | 186 | } |
Rhyme | 0:5ace1cc7a9f2 | 187 | |
Rhyme | 0:5ace1cc7a9f2 | 188 | BME280::BME280(PinName sda, PinName scl, int addr) |
Rhyme | 0:5ace1cc7a9f2 | 189 | { |
Rhyme | 0:5ace1cc7a9f2 | 190 | m_i2c = new I2C(sda, scl) ; |
Rhyme | 0:5ace1cc7a9f2 | 191 | m_addr = (addr << 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 192 | m_spi = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 193 | m_cs = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 194 | init() ; |
Rhyme | 0:5ace1cc7a9f2 | 195 | } |
Rhyme | 0:5ace1cc7a9f2 | 196 | |
Rhyme | 0:5ace1cc7a9f2 | 197 | BME280::BME280(PinName sck, PinName miso, PinName mosi, PinName cs) |
Rhyme | 0:5ace1cc7a9f2 | 198 | { |
Rhyme | 0:5ace1cc7a9f2 | 199 | m_cs = new DigitalOut(cs, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 200 | m_spi = new SPI(mosi, miso, sck) ; |
Rhyme | 0:5ace1cc7a9f2 | 201 | m_spi->format(8, 3) ; |
Rhyme | 0:5ace1cc7a9f2 | 202 | #if 0 |
Rhyme | 0:5ace1cc7a9f2 | 203 | #if defined (TARGET_KL25Z) |
Rhyme | 0:5ace1cc7a9f2 | 204 | *((uint8_t *)0x40076000) |= 0x01 ; /* lsb first */ |
Rhyme | 0:5ace1cc7a9f2 | 205 | #endif |
Rhyme | 0:5ace1cc7a9f2 | 206 | #endif |
Rhyme | 0:5ace1cc7a9f2 | 207 | m_i2c = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 208 | m_addr = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 209 | init() ; |
Rhyme | 0:5ace1cc7a9f2 | 210 | } |
Rhyme | 0:5ace1cc7a9f2 | 211 | |
Rhyme | 0:5ace1cc7a9f2 | 212 | BME280::~BME280() |
Rhyme | 0:5ace1cc7a9f2 | 213 | { |
Rhyme | 0:5ace1cc7a9f2 | 214 | if (m_spi) { |
Rhyme | 0:5ace1cc7a9f2 | 215 | delete m_spi ; |
Rhyme | 0:5ace1cc7a9f2 | 216 | delete m_cs ; |
Rhyme | 0:5ace1cc7a9f2 | 217 | } |
Rhyme | 0:5ace1cc7a9f2 | 218 | if (m_i2c) { |
Rhyme | 0:5ace1cc7a9f2 | 219 | delete m_i2c ; |
Rhyme | 0:5ace1cc7a9f2 | 220 | m_addr = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 221 | } |
Rhyme | 0:5ace1cc7a9f2 | 222 | } |
Rhyme | 0:5ace1cc7a9f2 | 223 | |
Rhyme | 0:5ace1cc7a9f2 | 224 | void BME280::i2c_readRegs(int addr, uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 225 | char t[1] = {addr} ; |
Rhyme | 0:5ace1cc7a9f2 | 226 | m_i2c->write(m_addr, t, 1, true) ; |
Rhyme | 0:5ace1cc7a9f2 | 227 | m_i2c->read(m_addr, (char*)data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 228 | } |
Rhyme | 0:5ace1cc7a9f2 | 229 | |
Rhyme | 0:5ace1cc7a9f2 | 230 | void BME280::i2c_writeRegs(uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 231 | m_i2c->write(m_addr, (char *)data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 232 | } |
Rhyme | 0:5ace1cc7a9f2 | 233 | |
Rhyme | 0:5ace1cc7a9f2 | 234 | void BME280::spi_readRegs(int addr, uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 235 | *m_cs = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 236 | m_spi->write(addr | 0x80) ; |
Rhyme | 0:5ace1cc7a9f2 | 237 | for (int i = 0 ; i < len ; i++ ) { |
Rhyme | 0:5ace1cc7a9f2 | 238 | // m_spi->write((addr+i)|0x80) ; // spacify address to read |
Rhyme | 0:5ace1cc7a9f2 | 239 | data[i] = m_spi->write((addr+i)|0x80) ; |
Rhyme | 0:5ace1cc7a9f2 | 240 | } |
Rhyme | 0:5ace1cc7a9f2 | 241 | m_spi->write(0x00) ; // to terminate read mode |
Rhyme | 0:5ace1cc7a9f2 | 242 | *m_cs = 1 ; |
Rhyme | 0:5ace1cc7a9f2 | 243 | } |
Rhyme | 0:5ace1cc7a9f2 | 244 | |
Rhyme | 0:5ace1cc7a9f2 | 245 | void BME280::spi_writeRegs(uint8_t * data, int len) { |
Rhyme | 0:5ace1cc7a9f2 | 246 | *m_cs = 0 ; |
Rhyme | 0:5ace1cc7a9f2 | 247 | for (int i = 0 ; i < len-1 ; i++ ) { |
Rhyme | 0:5ace1cc7a9f2 | 248 | // printf("writing 0x%02X := 0x%02X\n", (data[0]+i)^0x80, data[i+1]) ; |
Rhyme | 0:5ace1cc7a9f2 | 249 | m_spi->write((data[0]+i)^0x80) ; /* register address */ |
Rhyme | 0:5ace1cc7a9f2 | 250 | m_spi->write(data[i+1]) ; /* data to write */ |
Rhyme | 0:5ace1cc7a9f2 | 251 | |
Rhyme | 0:5ace1cc7a9f2 | 252 | } |
Rhyme | 0:5ace1cc7a9f2 | 253 | *m_cs = 1 ; |
Rhyme | 0:5ace1cc7a9f2 | 254 | } |
Rhyme | 0:5ace1cc7a9f2 | 255 | |
Rhyme | 0:5ace1cc7a9f2 | 256 | void BME280::readRegs(int addr, uint8_t *data, int len) |
Rhyme | 0:5ace1cc7a9f2 | 257 | { |
Rhyme | 0:5ace1cc7a9f2 | 258 | if (m_spi) { |
Rhyme | 0:5ace1cc7a9f2 | 259 | spi_readRegs(addr, data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 260 | } else if (m_i2c) { |
Rhyme | 0:5ace1cc7a9f2 | 261 | i2c_readRegs(addr, data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 262 | } |
Rhyme | 0:5ace1cc7a9f2 | 263 | } |
Rhyme | 0:5ace1cc7a9f2 | 264 | |
Rhyme | 0:5ace1cc7a9f2 | 265 | void BME280::writeRegs(uint8_t *data, int len) |
Rhyme | 0:5ace1cc7a9f2 | 266 | { |
Rhyme | 0:5ace1cc7a9f2 | 267 | if (m_spi) { |
Rhyme | 0:5ace1cc7a9f2 | 268 | spi_writeRegs(data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 269 | } else if (m_i2c) { |
Rhyme | 0:5ace1cc7a9f2 | 270 | i2c_writeRegs(data, len) ; |
Rhyme | 0:5ace1cc7a9f2 | 271 | } |
Rhyme | 0:5ace1cc7a9f2 | 272 | } |
Rhyme | 0:5ace1cc7a9f2 | 273 | |
Rhyme | 0:5ace1cc7a9f2 | 274 | void BME280::reset(void) |
Rhyme | 0:5ace1cc7a9f2 | 275 | { |
Rhyme | 0:5ace1cc7a9f2 | 276 | uint8_t data[2] ; |
Rhyme | 0:5ace1cc7a9f2 | 277 | data[0] = REG_RESET ; |
Rhyme | 0:5ace1cc7a9f2 | 278 | data[1] = 0xB6 ; |
Rhyme | 0:5ace1cc7a9f2 | 279 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 280 | } |
Rhyme | 0:5ace1cc7a9f2 | 281 | |
Rhyme | 0:5ace1cc7a9f2 | 282 | void BME280::trigger(void) |
Rhyme | 0:5ace1cc7a9f2 | 283 | { |
Rhyme | 0:5ace1cc7a9f2 | 284 | uint8_t data[2] ; |
Rhyme | 0:5ace1cc7a9f2 | 285 | readRegs(REG_CTRL_MEAS, &data[1], 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 286 | |
Rhyme | 0:5ace1cc7a9f2 | 287 | data[0] = REG_CTRL_MEAS ; |
Rhyme | 0:5ace1cc7a9f2 | 288 | data[1] = (data[1] & 0xFC) /* keep oversampling */ |
Rhyme | 0:5ace1cc7a9f2 | 289 | | (0x2) /* Forced Mode */ |
Rhyme | 0:5ace1cc7a9f2 | 290 | ; |
Rhyme | 0:5ace1cc7a9f2 | 291 | // data[1] = 0x38 | 0x02 ; |
Rhyme | 0:5ace1cc7a9f2 | 292 | writeRegs(data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 293 | } |
Rhyme | 0:5ace1cc7a9f2 | 294 | |
Rhyme | 0:5ace1cc7a9f2 | 295 | uint8_t BME280::busy(void) |
Rhyme | 0:5ace1cc7a9f2 | 296 | { |
Rhyme | 0:5ace1cc7a9f2 | 297 | uint8_t data[1] ; |
Rhyme | 0:5ace1cc7a9f2 | 298 | readRegs(REG_STATUS, data, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 299 | return( data[0] & 0x9 ) ; |
Rhyme | 0:5ace1cc7a9f2 | 300 | } |
Rhyme | 0:5ace1cc7a9f2 | 301 | |
Rhyme | 0:5ace1cc7a9f2 | 302 | uint8_t BME280::getID(void) |
Rhyme | 0:5ace1cc7a9f2 | 303 | { |
Rhyme | 0:5ace1cc7a9f2 | 304 | uint8_t data[1] ; |
Rhyme | 0:5ace1cc7a9f2 | 305 | readRegs(REG_ID, data, 1) ; |
Rhyme | 0:5ace1cc7a9f2 | 306 | return(data[0]) ; |
Rhyme | 0:5ace1cc7a9f2 | 307 | } |
Rhyme | 0:5ace1cc7a9f2 | 308 | |
Rhyme | 0:5ace1cc7a9f2 | 309 | void BME280::readData(uint8_t data[]) |
Rhyme | 0:5ace1cc7a9f2 | 310 | { |
Rhyme | 0:5ace1cc7a9f2 | 311 | readRegs(REG_PRESS_MSB, data, 8) ; |
Rhyme | 0:5ace1cc7a9f2 | 312 | printf("Data Read: ") ; |
Rhyme | 0:5ace1cc7a9f2 | 313 | for(int i = 0 ; i < 8 ; i++ ) { |
Rhyme | 0:5ace1cc7a9f2 | 314 | printf("%02X ", data[i]) ; |
Rhyme | 0:5ace1cc7a9f2 | 315 | } |
Rhyme | 0:5ace1cc7a9f2 | 316 | printf("\n") ; |
Rhyme | 0:5ace1cc7a9f2 | 317 | } |
Rhyme | 0:5ace1cc7a9f2 | 318 | |
Rhyme | 0:5ace1cc7a9f2 | 319 | float BME280::getTemperature(uint8_t data[]) |
Rhyme | 0:5ace1cc7a9f2 | 320 | { |
Rhyme | 0:5ace1cc7a9f2 | 321 | uint32_t temp_raw; |
Rhyme | 0:5ace1cc7a9f2 | 322 | float tempf; |
Rhyme | 0:5ace1cc7a9f2 | 323 | // uint8_t data[3]; |
Rhyme | 0:5ace1cc7a9f2 | 324 | |
Rhyme | 0:5ace1cc7a9f2 | 325 | // readRegs(REG_TEMP_MSB, data, 3) ; |
Rhyme | 0:5ace1cc7a9f2 | 326 | |
Rhyme | 0:5ace1cc7a9f2 | 327 | temp_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4); |
Rhyme | 0:5ace1cc7a9f2 | 328 | |
Rhyme | 0:5ace1cc7a9f2 | 329 | int32_t temp; |
Rhyme | 0:5ace1cc7a9f2 | 330 | |
Rhyme | 0:5ace1cc7a9f2 | 331 | temp = |
Rhyme | 0:5ace1cc7a9f2 | 332 | (((((temp_raw >> 3) - (dig_T1 << 1))) * dig_T2) >> 11) + |
Rhyme | 0:5ace1cc7a9f2 | 333 | ((((((temp_raw >> 4) - dig_T1) * ((temp_raw >> 4) - dig_T1)) >> 12) * dig_T3) >> 14); |
Rhyme | 0:5ace1cc7a9f2 | 334 | |
Rhyme | 0:5ace1cc7a9f2 | 335 | t_fine = temp; |
Rhyme | 0:5ace1cc7a9f2 | 336 | temp = (temp * 5 + 128) >> 8; |
Rhyme | 0:5ace1cc7a9f2 | 337 | tempf = (float)temp; |
Rhyme | 0:5ace1cc7a9f2 | 338 | |
Rhyme | 0:5ace1cc7a9f2 | 339 | return (tempf/100.0f); |
Rhyme | 0:5ace1cc7a9f2 | 340 | |
Rhyme | 0:5ace1cc7a9f2 | 341 | } |
Rhyme | 0:5ace1cc7a9f2 | 342 | |
Rhyme | 0:5ace1cc7a9f2 | 343 | float BME280::getHumidity(uint8_t data[]) |
Rhyme | 0:5ace1cc7a9f2 | 344 | { |
Rhyme | 0:5ace1cc7a9f2 | 345 | uint32_t hum_raw; |
Rhyme | 0:5ace1cc7a9f2 | 346 | float humf; |
Rhyme | 0:5ace1cc7a9f2 | 347 | // uint8_t data[2]; |
Rhyme | 0:5ace1cc7a9f2 | 348 | |
Rhyme | 0:5ace1cc7a9f2 | 349 | // readRegs(REG_HUM_MSB, data, 2) ; |
Rhyme | 0:5ace1cc7a9f2 | 350 | |
Rhyme | 0:5ace1cc7a9f2 | 351 | hum_raw = (data[0] << 8) | data[1]; |
Rhyme | 0:5ace1cc7a9f2 | 352 | |
Rhyme | 0:5ace1cc7a9f2 | 353 | int32_t v_x1; |
Rhyme | 0:5ace1cc7a9f2 | 354 | |
Rhyme | 0:5ace1cc7a9f2 | 355 | v_x1 = t_fine - 76800; |
Rhyme | 0:5ace1cc7a9f2 | 356 | v_x1 = (((((hum_raw << 14) -(((int32_t)dig_H4) << 20) - (((int32_t)dig_H5) * v_x1)) + |
Rhyme | 0:5ace1cc7a9f2 | 357 | ((int32_t)16384)) >> 15) * (((((((v_x1 * (int32_t)dig_H6) >> 10) * |
Rhyme | 0:5ace1cc7a9f2 | 358 | (((v_x1 * ((int32_t)dig_H3)) >> 11) + 32768)) >> 10) + 2097152) * |
Rhyme | 0:5ace1cc7a9f2 | 359 | (int32_t)dig_H2 + 8192) >> 14)); |
Rhyme | 0:5ace1cc7a9f2 | 360 | v_x1 = (v_x1 - (((((v_x1 >> 15) * (v_x1 >> 15)) >> 7) * (int32_t)dig_H1) >> 4)); |
Rhyme | 0:5ace1cc7a9f2 | 361 | v_x1 = (v_x1 < 0 ? 0 : v_x1); |
Rhyme | 0:5ace1cc7a9f2 | 362 | v_x1 = (v_x1 > 419430400 ? 419430400 : v_x1); |
Rhyme | 0:5ace1cc7a9f2 | 363 | |
Rhyme | 0:5ace1cc7a9f2 | 364 | humf = (float)(v_x1 >> 12); |
Rhyme | 0:5ace1cc7a9f2 | 365 | |
Rhyme | 0:5ace1cc7a9f2 | 366 | return (humf/1024.0f); |
Rhyme | 0:5ace1cc7a9f2 | 367 | } |
Rhyme | 0:5ace1cc7a9f2 | 368 | |
Rhyme | 0:5ace1cc7a9f2 | 369 | float BME280::getPressure(uint8_t data[]) |
Rhyme | 0:5ace1cc7a9f2 | 370 | { |
Rhyme | 0:5ace1cc7a9f2 | 371 | uint32_t press_raw; |
Rhyme | 0:5ace1cc7a9f2 | 372 | float pressf; |
Rhyme | 0:5ace1cc7a9f2 | 373 | // uint8_t data[3]; |
Rhyme | 0:5ace1cc7a9f2 | 374 | |
Rhyme | 0:5ace1cc7a9f2 | 375 | // readRegs(REG_PRESS_MSB, data, 3) ; |
Rhyme | 0:5ace1cc7a9f2 | 376 | |
Rhyme | 0:5ace1cc7a9f2 | 377 | press_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4); |
Rhyme | 0:5ace1cc7a9f2 | 378 | |
Rhyme | 0:5ace1cc7a9f2 | 379 | int32_t var1, var2; |
Rhyme | 0:5ace1cc7a9f2 | 380 | uint32_t press; |
Rhyme | 0:5ace1cc7a9f2 | 381 | |
Rhyme | 0:5ace1cc7a9f2 | 382 | var1 = (t_fine >> 1) - 64000; |
Rhyme | 0:5ace1cc7a9f2 | 383 | var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6; |
Rhyme | 0:5ace1cc7a9f2 | 384 | var2 = var2 + ((var1 * dig_P5) << 1); |
Rhyme | 0:5ace1cc7a9f2 | 385 | var2 = (var2 >> 2) + (dig_P4 << 16); |
Rhyme | 0:5ace1cc7a9f2 | 386 | var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18; |
Rhyme | 0:5ace1cc7a9f2 | 387 | var1 = ((32768 + var1) * dig_P1) >> 15; |
Rhyme | 0:5ace1cc7a9f2 | 388 | if (var1 == 0) { |
Rhyme | 0:5ace1cc7a9f2 | 389 | return 0; |
Rhyme | 0:5ace1cc7a9f2 | 390 | } |
Rhyme | 0:5ace1cc7a9f2 | 391 | press = (((1048576 - press_raw) - (var2 >> 12))) * 3125; |
Rhyme | 0:5ace1cc7a9f2 | 392 | if(press < 0x80000000) { |
Rhyme | 0:5ace1cc7a9f2 | 393 | press = (press << 1) / var1; |
Rhyme | 0:5ace1cc7a9f2 | 394 | } else { |
Rhyme | 0:5ace1cc7a9f2 | 395 | press = (press / var1) * 2; |
Rhyme | 0:5ace1cc7a9f2 | 396 | } |
Rhyme | 0:5ace1cc7a9f2 | 397 | var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12; |
Rhyme | 0:5ace1cc7a9f2 | 398 | var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13; |
Rhyme | 0:5ace1cc7a9f2 | 399 | press = (press + ((var1 + var2 + dig_P7) >> 4)); |
Rhyme | 0:5ace1cc7a9f2 | 400 | |
Rhyme | 0:5ace1cc7a9f2 | 401 | pressf = (float)press; |
Rhyme | 0:5ace1cc7a9f2 | 402 | return (pressf/100.0f); |
Rhyme | 0:5ace1cc7a9f2 | 403 | } |