BME280にアクセスするためのライブラリ
BME280.cpp@2:42725d11023b, 2018-07-10 (annotated)
- Committer:
- j_rocket_boy
- Date:
- Tue Jul 10 07:59:58 2018 +0000
- Revision:
- 2:42725d11023b
- Parent:
- 1:0dbf59c6e564
- Child:
- 3:df1107ddf502
?????????????????????????#define??????
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
j_rocket_boy | 0:95f2b96cdc7f | 1 | #include "mbed.h" |
j_rocket_boy | 0:95f2b96cdc7f | 2 | #include "BME280.h" |
j_rocket_boy | 0:95f2b96cdc7f | 3 | #include "i2c_general_io.h" |
j_rocket_boy | 0:95f2b96cdc7f | 4 | |
j_rocket_boy | 0:95f2b96cdc7f | 5 | BME280::BME280(PinName sda, PinName scl) |
j_rocket_boy | 0:95f2b96cdc7f | 6 | : |
j_rocket_boy | 0:95f2b96cdc7f | 7 | i2c_p(new GEN_I2C(sda, scl)), |
j_rocket_boy | 0:95f2b96cdc7f | 8 | sensor(*i2c_p) |
j_rocket_boy | 0:95f2b96cdc7f | 9 | { |
j_rocket_boy | 0:95f2b96cdc7f | 10 | init(); |
j_rocket_boy | 0:95f2b96cdc7f | 11 | } |
j_rocket_boy | 0:95f2b96cdc7f | 12 | |
j_rocket_boy | 0:95f2b96cdc7f | 13 | BME280::BME280(GEN_I2C &i2c_obj) |
j_rocket_boy | 0:95f2b96cdc7f | 14 | : |
j_rocket_boy | 0:95f2b96cdc7f | 15 | i2c_p(NULL), |
j_rocket_boy | 0:95f2b96cdc7f | 16 | sensor(i2c_obj) |
j_rocket_boy | 0:95f2b96cdc7f | 17 | { |
j_rocket_boy | 0:95f2b96cdc7f | 18 | init(); |
j_rocket_boy | 0:95f2b96cdc7f | 19 | } |
j_rocket_boy | 0:95f2b96cdc7f | 20 | |
j_rocket_boy | 0:95f2b96cdc7f | 21 | BME280::~BME280() |
j_rocket_boy | 0:95f2b96cdc7f | 22 | { |
j_rocket_boy | 0:95f2b96cdc7f | 23 | if (NULL != i2c_p) |
j_rocket_boy | 0:95f2b96cdc7f | 24 | delete i2c_p; |
j_rocket_boy | 0:95f2b96cdc7f | 25 | } |
j_rocket_boy | 0:95f2b96cdc7f | 26 | |
j_rocket_boy | 0:95f2b96cdc7f | 27 | |
j_rocket_boy | 0:95f2b96cdc7f | 28 | void BME280::read_sensor(void){ |
j_rocket_boy | 0:95f2b96cdc7f | 29 | char sensor_raw_data[8]; |
j_rocket_boy | 1:0dbf59c6e564 | 30 | long signed int T,P,H; //ADC読み込み後温度,気圧,湿度の生データ |
j_rocket_boy | 1:0dbf59c6e564 | 31 | long signed int T_cor; //温度の補正データ |
j_rocket_boy | 1:0dbf59c6e564 | 32 | long unsigned int P_cor,H_cor; //気圧,湿度の補正データ |
j_rocket_boy | 0:95f2b96cdc7f | 33 | |
j_rocket_boy | 0:95f2b96cdc7f | 34 | //読み込み |
j_rocket_boy | 0:95f2b96cdc7f | 35 | set_force_mode(); //測定開始 |
j_rocket_boy | 2:42725d11023b | 36 | while(BMP280_STATUS_IS_MEASURING); //測定待ち |
j_rocket_boy | 2:42725d11023b | 37 | sensor.read_reg(BME280_add, BMP280_PRESS_MSB, sensor_raw_data, 8); //PRESS_MSBレジスタから8バイト読み込み |
j_rocket_boy | 0:95f2b96cdc7f | 38 | T = sensor_raw_data[3] << 12 | sensor_raw_data[4] << 4 | sensor_raw_data[5] >> 4 ; |
j_rocket_boy | 0:95f2b96cdc7f | 39 | P = sensor_raw_data[0] << 12 | sensor_raw_data[1] << 4 | sensor_raw_data[2] >> 4 ; |
j_rocket_boy | 0:95f2b96cdc7f | 40 | H = sensor_raw_data[6] << 8 | sensor_raw_data[7]; |
j_rocket_boy | 0:95f2b96cdc7f | 41 | |
j_rocket_boy | 0:95f2b96cdc7f | 42 | //補正 |
j_rocket_boy | 0:95f2b96cdc7f | 43 | T_cor = BME280_compensate_T_int32(T); |
j_rocket_boy | 0:95f2b96cdc7f | 44 | P_cor = BME280_compensate_P_int64(P); |
j_rocket_boy | 0:95f2b96cdc7f | 45 | H_cor = BME280_compensate_H_int32(H); |
j_rocket_boy | 0:95f2b96cdc7f | 46 | |
j_rocket_boy | 0:95f2b96cdc7f | 47 | temp = T_cor / 100.0; |
j_rocket_boy | 0:95f2b96cdc7f | 48 | press = P_cor / 256.0; |
j_rocket_boy | 0:95f2b96cdc7f | 49 | hum = H_cor / 1024.0; |
j_rocket_boy | 0:95f2b96cdc7f | 50 | } |
j_rocket_boy | 0:95f2b96cdc7f | 51 | |
j_rocket_boy | 0:95f2b96cdc7f | 52 | bool BME280::data_is_ready(void){ |
j_rocket_boy | 2:42725d11023b | 53 | return !BMP280_STATUS_IS_MEASURING; |
j_rocket_boy | 0:95f2b96cdc7f | 54 | } |
j_rocket_boy | 0:95f2b96cdc7f | 55 | |
j_rocket_boy | 0:95f2b96cdc7f | 56 | void BME280::set_sleep_mode(void){ |
j_rocket_boy | 2:42725d11023b | 57 | sensor.write_reg(BME280_add, BMP280_CTRL_MEAS, (meas_reg_value&0xFC) | BMP280_SLEEP_MODE ); |
j_rocket_boy | 0:95f2b96cdc7f | 58 | } |
j_rocket_boy | 0:95f2b96cdc7f | 59 | |
j_rocket_boy | 0:95f2b96cdc7f | 60 | void BME280::set_force_mode(void){ |
j_rocket_boy | 2:42725d11023b | 61 | sensor.write_reg(BME280_add, BMP280_CTRL_MEAS, (meas_reg_value&0xFC) | BMP280_FORCE_MODE ); |
j_rocket_boy | 0:95f2b96cdc7f | 62 | } |
j_rocket_boy | 0:95f2b96cdc7f | 63 | |
j_rocket_boy | 0:95f2b96cdc7f | 64 | void BME280::set_normal_mode(void){ |
j_rocket_boy | 2:42725d11023b | 65 | sensor.write_reg(BME280_add, BMP280_CTRL_MEAS, (meas_reg_value&0xFC) | BMP280_NORMAL_MODE ); |
j_rocket_boy | 0:95f2b96cdc7f | 66 | } |
j_rocket_boy | 0:95f2b96cdc7f | 67 | |
j_rocket_boy | 0:95f2b96cdc7f | 68 | |
j_rocket_boy | 0:95f2b96cdc7f | 69 | //データシートより,補正関数 |
j_rocket_boy | 0:95f2b96cdc7f | 70 | // 温度を℃で返します。分解能は0.01℃です。「5123」の出力値は、51.23℃に相当します。 |
j_rocket_boy | 0:95f2b96cdc7f | 71 | // t_fineは、グローバル値として細かい温度値を持ちます。 |
j_rocket_boy | 1:0dbf59c6e564 | 72 | long signed int BME280::BME280_compensate_T_int32(long signed int adc_T){ |
j_rocket_boy | 1:0dbf59c6e564 | 73 | long signed int var1, var2, T; |
j_rocket_boy | 1:0dbf59c6e564 | 74 | var1 = ((((adc_T>>3) - ((long signed int)dig_T1<<1))) * ((long signed int)dig_T2)) >> 11; |
j_rocket_boy | 1:0dbf59c6e564 | 75 | var2 = (((((adc_T>>4) - ((long signed int)dig_T1)) * ((adc_T>>4) - ((long signed int)dig_T1))) >> 12) * |
j_rocket_boy | 1:0dbf59c6e564 | 76 | ((long signed int)dig_T3)) >> 14; |
j_rocket_boy | 0:95f2b96cdc7f | 77 | t_fine = var1 + var2; |
j_rocket_boy | 0:95f2b96cdc7f | 78 | T = (t_fine * 5 + 128) >> 8; |
j_rocket_boy | 0:95f2b96cdc7f | 79 | return T; |
j_rocket_boy | 0:95f2b96cdc7f | 80 | } |
j_rocket_boy | 0:95f2b96cdc7f | 81 | |
j_rocket_boy | 0:95f2b96cdc7f | 82 | // 圧力(Pa)を、Q24.8形式の符号なし32ビット整数として返します。(24個の整数ビットと8個の小数ビット) |
j_rocket_boy | 0:95f2b96cdc7f | 83 | // 「24674867」の出力値は、24674867/256 = 96386.2Pa = 963.862hPaに相当します。 |
j_rocket_boy | 1:0dbf59c6e564 | 84 | long unsigned int BME280::BME280_compensate_P_int64(long signed int adc_P){ |
j_rocket_boy | 1:0dbf59c6e564 | 85 | long long signed int var1, var2, p; |
j_rocket_boy | 1:0dbf59c6e564 | 86 | var1 = ((long long signed int)t_fine) - 128000; |
j_rocket_boy | 1:0dbf59c6e564 | 87 | var2 = var1 * var1 * (long long signed int)dig_P6; |
j_rocket_boy | 1:0dbf59c6e564 | 88 | var2 = var2 + ((var1*(long long signed int)dig_P5)<<17); |
j_rocket_boy | 1:0dbf59c6e564 | 89 | var2 = var2 + (((long long signed int)dig_P4)<<35); |
j_rocket_boy | 1:0dbf59c6e564 | 90 | var1 = ((var1 * var1 * (long long signed int)dig_P3)>>8) + ((var1 * (long long signed int)dig_P2)<<12); |
j_rocket_boy | 1:0dbf59c6e564 | 91 | var1 = (((((long long signed int)1)<<47)+var1))*((long long signed int)dig_P1)>>33; |
j_rocket_boy | 0:95f2b96cdc7f | 92 | if (var1 == 0){ |
j_rocket_boy | 0:95f2b96cdc7f | 93 | return 0; // ゼロ除算による例外を避ける。 |
j_rocket_boy | 0:95f2b96cdc7f | 94 | } |
j_rocket_boy | 0:95f2b96cdc7f | 95 | p = 1048576-adc_P; |
j_rocket_boy | 0:95f2b96cdc7f | 96 | p = (((p<<31)-var2)*3125)/var1; |
j_rocket_boy | 1:0dbf59c6e564 | 97 | var1 = (((long long signed int)dig_P9) * (p>>13) * (p>>13)) >> 25; |
j_rocket_boy | 1:0dbf59c6e564 | 98 | var2 = (((long long signed int)dig_P8) * p) >> 19; |
j_rocket_boy | 1:0dbf59c6e564 | 99 | p = ((p + var1 + var2) >> 8) + (((long long signed int)dig_P7)<<4); |
j_rocket_boy | 1:0dbf59c6e564 | 100 | return (long unsigned int)p; |
j_rocket_boy | 0:95f2b96cdc7f | 101 | } |
j_rocket_boy | 0:95f2b96cdc7f | 102 | |
j_rocket_boy | 0:95f2b96cdc7f | 103 | // 湿度(%RH)を、Q22.10形式の符号なし32ビット整数として返します。(22個の整数と10個の小数ビット) |
j_rocket_boy | 0:95f2b96cdc7f | 104 | // 「47445」の出力値は、47445/1024 = 46.333%RHに相当します。 |
j_rocket_boy | 1:0dbf59c6e564 | 105 | long unsigned int BME280::BME280_compensate_H_int32(long signed int adc_H){ |
j_rocket_boy | 1:0dbf59c6e564 | 106 | long signed int v_x1_u32r; |
j_rocket_boy | 1:0dbf59c6e564 | 107 | v_x1_u32r = (t_fine - ((long signed int)76800)); |
j_rocket_boy | 1:0dbf59c6e564 | 108 | v_x1_u32r = (((((adc_H << 14) - (((long signed int)dig_H4) << 20) - (((long signed int)dig_H5) * v_x1_u32r)) + |
j_rocket_boy | 1:0dbf59c6e564 | 109 | ((long signed int)16384)) >> 15) * (((((((v_x1_u32r * ((long signed int)dig_H6)) >> 10) * (((v_x1_u32r * |
j_rocket_boy | 1:0dbf59c6e564 | 110 | ((long signed int)dig_H3)) >> 11) + ((long signed int)32768))) >> 10) + ((long signed int)2097152)) * |
j_rocket_boy | 1:0dbf59c6e564 | 111 | ((long signed int)dig_H2) + 8192) >> 14)); |
j_rocket_boy | 1:0dbf59c6e564 | 112 | v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((long signed int)dig_H1)) >> 4)); |
j_rocket_boy | 0:95f2b96cdc7f | 113 | v_x1_u32r = (v_x1_u32r < 0 ? 0 : v_x1_u32r); |
j_rocket_boy | 0:95f2b96cdc7f | 114 | v_x1_u32r = (v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r); |
j_rocket_boy | 1:0dbf59c6e564 | 115 | return (long unsigned int)(v_x1_u32r>>12); |
j_rocket_boy | 0:95f2b96cdc7f | 116 | } |
j_rocket_boy | 0:95f2b96cdc7f | 117 | //補正関数終わり |
j_rocket_boy | 0:95f2b96cdc7f | 118 | |
j_rocket_boy | 0:95f2b96cdc7f | 119 | void BME280::init(void){ |
j_rocket_boy | 0:95f2b96cdc7f | 120 | char calib[32] = {0}; |
j_rocket_boy | 0:95f2b96cdc7f | 121 | char reg_data; |
j_rocket_boy | 2:42725d11023b | 122 | sensor.write_reg(BME280_add, BMP280_RESET_REG, BMP280_RESET_VALUE); |
j_rocket_boy | 0:95f2b96cdc7f | 123 | |
j_rocket_boy | 2:42725d11023b | 124 | reg_data = sensor.read_reg(BME280_add,BMP280_ID); //ID読み込み |
j_rocket_boy | 2:42725d11023b | 125 | if(reg_data != BMP280_ID_VALUE){ //ID不一致エラー |
j_rocket_boy | 0:95f2b96cdc7f | 126 | printf("error\n"); |
j_rocket_boy | 0:95f2b96cdc7f | 127 | while(1); |
j_rocket_boy | 0:95f2b96cdc7f | 128 | } |
j_rocket_boy | 2:42725d11023b | 129 | while(BMP280_STATUS_IS_COPYING); //不揮発メモリのデータのレジスタコピー待ち |
j_rocket_boy | 0:95f2b96cdc7f | 130 | |
j_rocket_boy | 0:95f2b96cdc7f | 131 | //ADC補償式用定数読み込み |
j_rocket_boy | 2:42725d11023b | 132 | sensor.read_reg(BME280_add, BMP280_CALIB00, &(calib[0]), 24); |
j_rocket_boy | 2:42725d11023b | 133 | sensor.read_reg(BME280_add, BMP280_CALIB25, &(calib[24]), 1); |
j_rocket_boy | 2:42725d11023b | 134 | sensor.read_reg(BME280_add, BMP280_CALIB26, &(calib[25]), 7); |
j_rocket_boy | 0:95f2b96cdc7f | 135 | |
j_rocket_boy | 0:95f2b96cdc7f | 136 | dig_T1 = calib[ 0] | (calib[ 1] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 137 | dig_T2 = calib[ 2] | (calib[ 3] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 138 | dig_T3 = calib[ 4] | (calib[ 5] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 139 | |
j_rocket_boy | 0:95f2b96cdc7f | 140 | dig_P1 = calib[ 6] | (calib[ 7] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 141 | dig_P2 = calib[ 8] | (calib[ 9] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 142 | dig_P3 = calib[10] | (calib[11] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 143 | dig_P4 = calib[12] | (calib[13] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 144 | dig_P5 = calib[14] | (calib[15] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 145 | dig_P6 = calib[16] | (calib[17] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 146 | dig_P7 = calib[18] | (calib[19] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 147 | dig_P8 = calib[20] | (calib[21] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 148 | dig_P9 = calib[22] | (calib[23] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 149 | |
j_rocket_boy | 0:95f2b96cdc7f | 150 | dig_H1 = calib[24]; |
j_rocket_boy | 0:95f2b96cdc7f | 151 | dig_H2 = calib[25] | (calib[26] << 8); |
j_rocket_boy | 0:95f2b96cdc7f | 152 | dig_H3 = calib[27]; |
j_rocket_boy | 0:95f2b96cdc7f | 153 | dig_H4 = (calib[28]<<4) | (calib[29] & 0x0F); |
j_rocket_boy | 0:95f2b96cdc7f | 154 | dig_H5 = ((calib[29]>>4) & 0x0F) | (calib[30] << 4); |
j_rocket_boy | 0:95f2b96cdc7f | 155 | dig_H6 = calib[31]; |
j_rocket_boy | 0:95f2b96cdc7f | 156 | //ADC補償式用定数読み込みEND |
j_rocket_boy | 0:95f2b96cdc7f | 157 | |
j_rocket_boy | 0:95f2b96cdc7f | 158 | //センサ設定 |
j_rocket_boy | 2:42725d11023b | 159 | sensor.write_reg(BME280_add, BMP280_CTRL_HUM , hum_reg_value); |
j_rocket_boy | 2:42725d11023b | 160 | sensor.write_reg(BME280_add, BMP280_CTRL_MEAS, meas_reg_value); |
j_rocket_boy | 2:42725d11023b | 161 | sensor.write_reg(BME280_add, BMP280_CONFIG , config_reg_value); |
j_rocket_boy | 0:95f2b96cdc7f | 162 | |
j_rocket_boy | 0:95f2b96cdc7f | 163 | } |
j_rocket_boy | 0:95f2b96cdc7f | 164 | |
j_rocket_boy | 0:95f2b96cdc7f | 165 |