BISITE Firmware / BME280

BME280 Adafruit sensor with Mbed-os compatibility.

Fork of BME280 by LoRa Project

BME280.cpp@2:ee200b715195, 2020-07-25 (annotated)

Committer:
saranjay
Date:
Sat Jul 25 06:37:49 2020 +0000
Revision:
2:ee200b715195
Parent:
1:7b525853bad0 
modified for use with mbed-os.

Who changed what in which revision?

UserRevisionLine numberNew 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) {
saranjay 2:ee200b715195 251 char t[1];
saranjay 2:ee200b715195 252 t[0] = addr ;
Rhyme 0:5ace1cc7a9f2 253 m_i2c->write(m_addr, t, 1, true) ;
Rhyme 0:5ace1cc7a9f2 254 m_i2c->read(m_addr, (char*)data, len) ;
Rhyme 0:5ace1cc7a9f2 255 }
Rhyme 0:5ace1cc7a9f2 256
Rhyme 0:5ace1cc7a9f2 257 void BME280::i2c_writeRegs(uint8_t * data, int len) {
Rhyme 0:5ace1cc7a9f2 258 m_i2c->write(m_addr, (char *)data, len) ;
Rhyme 0:5ace1cc7a9f2 259 }
Rhyme 0:5ace1cc7a9f2 260
Rhyme 0:5ace1cc7a9f2 261 void BME280::spi_readRegs(int addr, uint8_t * data, int len) {
Rhyme 0:5ace1cc7a9f2 262 *m_cs = 0 ;
Rhyme 0:5ace1cc7a9f2 263 m_spi->write(addr | 0x80) ;
Rhyme 0:5ace1cc7a9f2 264 for (int i = 0 ; i < len ; i++ ) {
Rhyme 0:5ace1cc7a9f2 265 data[i] = m_spi->write((addr+i)|0x80) ;
Rhyme 0:5ace1cc7a9f2 266 }
Rhyme 0:5ace1cc7a9f2 267 m_spi->write(0x00) ; // to terminate read mode
Rhyme 0:5ace1cc7a9f2 268 *m_cs = 1 ;
Rhyme 0:5ace1cc7a9f2 269 }
Rhyme 0:5ace1cc7a9f2 270
Rhyme 0:5ace1cc7a9f2 271 void BME280::spi_writeRegs(uint8_t * data, int len) {
Rhyme 0:5ace1cc7a9f2 272 *m_cs = 0 ;
Rhyme 0:5ace1cc7a9f2 273 for (int i = 0 ; i < len-1 ; i++ ) {
Rhyme 0:5ace1cc7a9f2 274 m_spi->write((data[0]+i)^0x80) ; /* register address */
Rhyme 0:5ace1cc7a9f2 275 m_spi->write(data[i+1]) ; /* data to write */
Rhyme 0:5ace1cc7a9f2 276
Rhyme 0:5ace1cc7a9f2 277 }
Rhyme 0:5ace1cc7a9f2 278 *m_cs = 1 ;
Rhyme 0:5ace1cc7a9f2 279 }
Rhyme 0:5ace1cc7a9f2 280
Rhyme 0:5ace1cc7a9f2 281 void BME280::readRegs(int addr, uint8_t *data, int len)
Rhyme 0:5ace1cc7a9f2 282 {
Rhyme 0:5ace1cc7a9f2 283 if (m_spi) {
Rhyme 0:5ace1cc7a9f2 284 spi_readRegs(addr, data, len) ;
Rhyme 0:5ace1cc7a9f2 285 } else if (m_i2c) {
Rhyme 0:5ace1cc7a9f2 286 i2c_readRegs(addr, data, len) ;
Rhyme 0:5ace1cc7a9f2 287 }
Rhyme 0:5ace1cc7a9f2 288 }
Rhyme 0:5ace1cc7a9f2 289
Rhyme 0:5ace1cc7a9f2 290 void BME280::writeRegs(uint8_t *data, int len)
Rhyme 0:5ace1cc7a9f2 291 {
Rhyme 0:5ace1cc7a9f2 292 if (m_spi) {
Rhyme 0:5ace1cc7a9f2 293 spi_writeRegs(data, len) ;
Rhyme 0:5ace1cc7a9f2 294 } else if (m_i2c) {
Rhyme 0:5ace1cc7a9f2 295 i2c_writeRegs(data, len) ;
Rhyme 0:5ace1cc7a9f2 296 }
Rhyme 0:5ace1cc7a9f2 297 }
Rhyme 0:5ace1cc7a9f2 298
Rhyme 0:5ace1cc7a9f2 299 void BME280::reset(void)
Rhyme 0:5ace1cc7a9f2 300 {
Rhyme 0:5ace1cc7a9f2 301 uint8_t data[2] ;
Rhyme 0:5ace1cc7a9f2 302 data[0] = REG_RESET ;
Rhyme 0:5ace1cc7a9f2 303 data[1] = 0xB6 ;
Rhyme 0:5ace1cc7a9f2 304 writeRegs(data, 2) ;
Rhyme 0:5ace1cc7a9f2 305 }
Rhyme 0:5ace1cc7a9f2 306
Rhyme 0:5ace1cc7a9f2 307 void BME280::trigger(void)
Rhyme 0:5ace1cc7a9f2 308 {
Rhyme 0:5ace1cc7a9f2 309 uint8_t data[2] ;
Rhyme 0:5ace1cc7a9f2 310 readRegs(REG_CTRL_MEAS, &data[1], 1) ;
Rhyme 0:5ace1cc7a9f2 311
Rhyme 0:5ace1cc7a9f2 312 data[0] = REG_CTRL_MEAS ;
Rhyme 0:5ace1cc7a9f2 313 data[1] = (data[1] & 0xFC) /* keep oversampling */
Rhyme 0:5ace1cc7a9f2 314 | (0x2) /* Forced Mode */
Rhyme 0:5ace1cc7a9f2 315 ;
Rhyme 0:5ace1cc7a9f2 316 writeRegs(data, 2) ;
Rhyme 0:5ace1cc7a9f2 317 }
Rhyme 0:5ace1cc7a9f2 318
Rhyme 0:5ace1cc7a9f2 319 uint8_t BME280::busy(void)
Rhyme 0:5ace1cc7a9f2 320 {
Rhyme 0:5ace1cc7a9f2 321 uint8_t data[1] ;
Rhyme 0:5ace1cc7a9f2 322 readRegs(REG_STATUS, data, 1) ;
Rhyme 0:5ace1cc7a9f2 323 return( data[0] & 0x9 ) ;
Rhyme 0:5ace1cc7a9f2 324 }
Rhyme 0:5ace1cc7a9f2 325
Rhyme 0:5ace1cc7a9f2 326 uint8_t BME280::getID(void)
Rhyme 0:5ace1cc7a9f2 327 {
Rhyme 0:5ace1cc7a9f2 328 uint8_t data[1] ;
Rhyme 0:5ace1cc7a9f2 329 readRegs(REG_ID, data, 1) ;
Rhyme 0:5ace1cc7a9f2 330 return(data[0]) ;
Rhyme 0:5ace1cc7a9f2 331 }
Rhyme 0:5ace1cc7a9f2 332
Rhyme 1:7b525853bad0 333 float BME280::getTemperature(void)
Rhyme 0:5ace1cc7a9f2 334 {
Rhyme 1:7b525853bad0 335 float tempf ;
Rhyme 1:7b525853bad0 336 uint8_t data[3] ;
Rhyme 1:7b525853bad0 337 BME280_S32_t var1, var2, T ;
Rhyme 1:7b525853bad0 338 BME280_S32_t adc_T ;
Rhyme 1:7b525853bad0 339
Rhyme 1:7b525853bad0 340 readRegs(REG_TEMP_MSB, data, 3) ;
Rhyme 1:7b525853bad0 341 adc_T = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
Rhyme 1:7b525853bad0 342
Rhyme 1:7b525853bad0 343 var1 = ((((adc_T>>3) - ((BME280_S32_t)dig_T1<<1))) * ((BME280_S32_t)dig_T2)) >> 11;
Rhyme 1:7b525853bad0 344 var2 = (((((adc_T>>4) - ((BME280_S32_t)dig_T1)) * ((adc_T>>4) - ((BME280_S32_t)dig_T1))) >> 12) *
Rhyme 1:7b525853bad0 345 ((BME280_S32_t)dig_T3)) >> 14;
Rhyme 1:7b525853bad0 346 t_fine = var1 + var2;
Rhyme 1:7b525853bad0 347 T = (t_fine * 5 + 128) >> 8;
Rhyme 1:7b525853bad0 348
Rhyme 1:7b525853bad0 349 tempf = (float)T;
Rhyme 0:5ace1cc7a9f2 350 return (tempf/100.0f);
Rhyme 0:5ace1cc7a9f2 351 }
Rhyme 0:5ace1cc7a9f2 352
Rhyme 1:7b525853bad0 353 float BME280::getPressure(void)
Rhyme 0:5ace1cc7a9f2 354 {
Rhyme 1:7b525853bad0 355 BME280_S32_t adc_P ;
Rhyme 1:7b525853bad0 356 BME280_S64_t var1, var2, p ;
Rhyme 1:7b525853bad0 357 float pressf;
Rhyme 1:7b525853bad0 358 uint8_t data[3];
Rhyme 0:5ace1cc7a9f2 359
Rhyme 1:7b525853bad0 360 readRegs(REG_PRESS_MSB, data, 3) ;
Rhyme 1:7b525853bad0 361 adc_P = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
Rhyme 0:5ace1cc7a9f2 362
Rhyme 1:7b525853bad0 363 var1 = ((BME280_S64_t)t_fine) - 128000;
Rhyme 1:7b525853bad0 364 var2 = var1 * var1 * (BME280_S64_t)dig_P6;
Rhyme 1:7b525853bad0 365 var2 = var2 + ((var1*(BME280_S64_t)dig_P5)<<17);
Rhyme 1:7b525853bad0 366 var2 = var2 + (((BME280_S64_t)dig_P4)<<35);
Rhyme 1:7b525853bad0 367 var1 = ((var1 * var1 * (BME280_S64_t)dig_P3)>>8) + ((var1 * (BME280_S64_t)dig_P2)<<12);
Rhyme 1:7b525853bad0 368 var1 = (((((BME280_S64_t)1)<<47)+var1))*((BME280_S64_t)dig_P1)>>33;
Rhyme 1:7b525853bad0 369 if (var1 == 0) {
Rhyme 1:7b525853bad0 370 return 0; // avoid exception caused by division by zero
Rhyme 1:7b525853bad0 371 }
Rhyme 1:7b525853bad0 372 p = 1048576-adc_P;
Rhyme 1:7b525853bad0 373 p = (((p<<31)-var2)*3125)/var1;
Rhyme 1:7b525853bad0 374 var1 = (((BME280_S64_t)dig_P9) * (p>>13) * (p>>13)) >> 25;
Rhyme 1:7b525853bad0 375 var2 = (((BME280_S64_t)dig_P8) * p) >> 19;
Rhyme 1:7b525853bad0 376 p = ((p + var1 + var2) >> 8) + (((BME280_S64_t)dig_P7)<<4);
Rhyme 0:5ace1cc7a9f2 377
Rhyme 1:7b525853bad0 378 pressf = (float)(p >> 8) ;
Rhyme 1:7b525853bad0 379 return (pressf/100.0f);
Rhyme 0:5ace1cc7a9f2 380 }
Rhyme 0:5ace1cc7a9f2 381
Rhyme 1:7b525853bad0 382 float BME280::getHumidity(void)
Rhyme 0:5ace1cc7a9f2 383 {
Rhyme 1:7b525853bad0 384 BME280_S32_t adc_H;
Rhyme 1:7b525853bad0 385 BME280_S32_t v_x1_u32r ;
Rhyme 1:7b525853bad0 386 float humf;
Rhyme 1:7b525853bad0 387 uint8_t data[2];
Rhyme 0:5ace1cc7a9f2 388
Rhyme 1:7b525853bad0 389 readRegs(REG_HUM_MSB, data, 2) ;
Rhyme 1:7b525853bad0 390 adc_H = (data[0] << 8) | data[1];
Rhyme 0:5ace1cc7a9f2 391
Rhyme 1:7b525853bad0 392 v_x1_u32r = (t_fine - ((BME280_S32_t)76800));
Rhyme 1:7b525853bad0 393 v_x1_u32r = (((((adc_H << 14) - (((BME280_S32_t)dig_H4) << 20) - (((BME280_S32_t)dig_H5) * v_x1_u32r)) +
Rhyme 1:7b525853bad0 394 ((BME280_S32_t)16384)) >> 15) * (((((((v_x1_u32r * ((BME280_S32_t)dig_H6)) >> 10) * (((v_x1_u32r *
Rhyme 1:7b525853bad0 395 ((BME280_S32_t)dig_H3)) >> 11) + ((BME280_S32_t)32768))) >> 10) + ((BME280_S32_t)2097152)) *
Rhyme 1:7b525853bad0 396 ((BME280_S32_t)dig_H2) + 8192) >> 14));
Rhyme 1:7b525853bad0 397 v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((BME280_S32_t)dig_H1)) >> 4));
Rhyme 1:7b525853bad0 398 v_x1_u32r = (v_x1_u32r < 0 ? 0 : v_x1_u32r);
Rhyme 1:7b525853bad0 399 v_x1_u32r = (v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r);
Rhyme 1:7b525853bad0 400 humf = (float)(v_x1_u32r >> 12) ;
Rhyme 1:7b525853bad0 401
Rhyme 1:7b525853bad0 402 return (humf/1024.0f);
Rhyme 0:5ace1cc7a9f2 403 }