Motoo Tanaka / BME280

My trial of BME280 library, tested with Adafruit BME280 module

Dependents:   test_BME280

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?

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 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 }