CHENGQI YANG / BME680

BME680 is an integrated environmental sensor developed specifically for mobile applications and wearables where size and low power consumption are key requirements.

Dependents:   Example_DS3231_test

BME680.cpp@0:c70b7ececf93, 2016-07-22 (annotated)

Committer:
yangcq88517
Date:
Fri Jul 22 17:38:11 2016 +0000
Revision:
0:c70b7ececf93
Child:
1:85088a918342
initial upload

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yangcq88517 0:c70b7ececf93 1 #include "BME680.h"
yangcq88517 0:c70b7ececf93 2
yangcq88517 0:c70b7ececf93 3 // no idea why this is not the same as the PDF
yangcq88517 0:c70b7ececf93 4 //const double BME680::const_array1[16] = {1,1,1,1,1,0.99,1,0.992,1,1,0.998,0.995,1,0.99,1,1};
yangcq88517 0:c70b7ececf93 5 //const double BME680::const_array2[16] = {8000000,4000000,2000000,1000000,499500.4995,248262.1648,125000,63004.03226,31281.28128,15625,7812.5,3906.25,1953.125,976.5625,488.28125,244.140625};
yangcq88517 0:c70b7ececf93 6
yangcq88517 0:c70b7ececf93 7
yangcq88517 0:c70b7ececf93 8 const uint64_t BME680::lookup_k1_range[16] = {
yangcq88517 0:c70b7ececf93 9 2147483647UL, 2147483647UL, 2147483647UL, 2147483647UL, 2147483647UL,
yangcq88517 0:c70b7ececf93 10 2126008810UL, 2147483647UL, 2130303777UL, 2147483647UL, 2147483647UL,
yangcq88517 0:c70b7ececf93 11 2143188679UL, 2136746228UL, 2147483647UL, 2126008810UL, 2147483647UL,
yangcq88517 0:c70b7ececf93 12 2147483647UL
yangcq88517 0:c70b7ececf93 13 };
yangcq88517 0:c70b7ececf93 14
yangcq88517 0:c70b7ececf93 15 const uint64_t BME680::lookup_k2_range[16] = {
yangcq88517 0:c70b7ececf93 16 4096000000UL, 2048000000UL, 1024000000UL, 512000000UL,
yangcq88517 0:c70b7ececf93 17 255744255UL, 127110228UL, 64000000UL, 32258064UL, 16016016UL,
yangcq88517 0:c70b7ececf93 18 8000000UL, 4000000UL, 2000000UL, 1000000UL, 500000UL, 250000UL,
yangcq88517 0:c70b7ececf93 19 125000UL
yangcq88517 0:c70b7ececf93 20 };
yangcq88517 0:c70b7ececf93 21
yangcq88517 0:c70b7ececf93 22 const double BME680::_lookup_k1_range[BME680_GAS_RANGE_RL_LENGTH] = {
yangcq88517 0:c70b7ececf93 23 0.0, 0.0, 0.0, 0.0, 0.0, -1.0, 0.0, -0.8,
yangcq88517 0:c70b7ececf93 24 0.0, 0.0, -0.2, -0.5, 0.0, -1.0, 0.0, 0.0
yangcq88517 0:c70b7ececf93 25 };
yangcq88517 0:c70b7ececf93 26 const double BME680::_lookup_k2_range[BME680_GAS_RANGE_RL_LENGTH] = {
yangcq88517 0:c70b7ececf93 27 0.0, 0.0, 0.0, 0.0, 0.1, 0.7, 0.0, -0.8,
yangcq88517 0:c70b7ececf93 28 -0.1, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0
yangcq88517 0:c70b7ececf93 29 };
yangcq88517 0:c70b7ececf93 30
yangcq88517 0:c70b7ececf93 31
yangcq88517 0:c70b7ececf93 32 #ifdef FIXED_POINT_COMPENSATION
yangcq88517 0:c70b7ececf93 33 int32_t BME680::getCompensatedTemperature(int field)
yangcq88517 0:c70b7ececf93 34 {
yangcq88517 0:c70b7ececf93 35 uint32_t v_uncomp_temperature_u32 = getTemp1Data(field);
yangcq88517 0:c70b7ececf93 36
yangcq88517 0:c70b7ececf93 37 int32_t var1 = ((int32_t)v_uncomp_temperature_u32 >> 3) - ((int32_t)(par_T1 << 1));
yangcq88517 0:c70b7ececf93 38 int32_t var2 = (var1 * (int32_t) par_T2) >> 11;
yangcq88517 0:c70b7ececf93 39 int32_t var3 = ((((var1 >> 1) * (var1 >> 1)) >> 12) * ((int32_t)(par_T3 << 4))) >> 14;
yangcq88517 0:c70b7ececf93 40 t_fine = var2 + var3;
yangcq88517 0:c70b7ececf93 41 return ((t_fine * 5) + 128) >> 8;
yangcq88517 0:c70b7ececf93 42 }
yangcq88517 0:c70b7ececf93 43
yangcq88517 0:c70b7ececf93 44 int16_t BME680::getTemperatureInt(int field)
yangcq88517 0:c70b7ececf93 45 {
yangcq88517 0:c70b7ececf93 46 getCompensatedTemperature(field);
yangcq88517 0:c70b7ececf93 47 return (((t_fine - 122880) * 25) + 128) >> 8;
yangcq88517 0:c70b7ececf93 48 }
yangcq88517 0:c70b7ececf93 49
yangcq88517 0:c70b7ececf93 50 int32_t BME680::getCompensateHumidity(int field)
yangcq88517 0:c70b7ececf93 51 {
yangcq88517 0:c70b7ececf93 52 uint32_t v_uncomp_humidity_u32 = getHumidityData(field);
yangcq88517 0:c70b7ececf93 53
yangcq88517 0:c70b7ececf93 54 int32_t temp_scaled = (t_fine * 5 + 128) >> 8;
yangcq88517 0:c70b7ececf93 55 int32_t var1 = (int32_t)v_uncomp_humidity_u32 -
yangcq88517 0:c70b7ececf93 56 ((int32_t)((int32_t)par_H1 << 4)) -
yangcq88517 0:c70b7ececf93 57 (((temp_scaled * (int32_t)par_H3) /
yangcq88517 0:c70b7ececf93 58 ((int32_t)100)) >> 1);
yangcq88517 0:c70b7ececf93 59
yangcq88517 0:c70b7ececf93 60 int32_t var2 = ((int32_t)par_H2 *
yangcq88517 0:c70b7ececf93 61 (((temp_scaled * (int32_t)par_H4) /
yangcq88517 0:c70b7ececf93 62 ((int32_t)100)) + (((temp_scaled *
yangcq88517 0:c70b7ececf93 63 ((temp_scaled * (int32_t)par_H5) /
yangcq88517 0:c70b7ececf93 64 ((int32_t)100))) >> 6) / ((int32_t)100)) + (int32_t)(1 << 14))) >> 10;
yangcq88517 0:c70b7ececf93 65
yangcq88517 0:c70b7ececf93 66 int32_t var3 = var1 * var2;
yangcq88517 0:c70b7ececf93 67
yangcq88517 0:c70b7ececf93 68 int32_t var4 = ((((int32_t)par_H6) << 7) +
yangcq88517 0:c70b7ececf93 69 ((temp_scaled * (int32_t)par_H7) /
yangcq88517 0:c70b7ececf93 70 ((int32_t)100))) >> 4;
yangcq88517 0:c70b7ececf93 71
yangcq88517 0:c70b7ececf93 72 int32_t var5 = ((var3 >> 14) * (var3 >> 14)) >> 10;
yangcq88517 0:c70b7ececf93 73 int32_t var6 = (var4 * var5) >> 1;
yangcq88517 0:c70b7ececf93 74
yangcq88517 0:c70b7ececf93 75 int32_t humidity_comp = (var3 + var6) >> 12;
yangcq88517 0:c70b7ececf93 76 if (humidity_comp > BME680_MAX_HUMIDITY_VALUE)
yangcq88517 0:c70b7ececf93 77 humidity_comp = BME680_MAX_HUMIDITY_VALUE;
yangcq88517 0:c70b7ececf93 78 else if (humidity_comp < BME680_MIN_HUMIDITY_VALUE)
yangcq88517 0:c70b7ececf93 79 humidity_comp = BME680_MIN_HUMIDITY_VALUE;
yangcq88517 0:c70b7ececf93 80
yangcq88517 0:c70b7ececf93 81 return humidity_comp;
yangcq88517 0:c70b7ececf93 82 }
yangcq88517 0:c70b7ececf93 83
yangcq88517 0:c70b7ececf93 84 uint16_t BME680::getHumidityInt(int field)
yangcq88517 0:c70b7ececf93 85 {
yangcq88517 0:c70b7ececf93 86 uint32_t v_x1_u32 = (uint32_t) getCompensateHumidity(field);
yangcq88517 0:c70b7ececf93 87 uint16_t v_x2_u32 = (uint16_t)(v_x1_u32 >> 1);
yangcq88517 0:c70b7ececf93 88 return v_x2_u32;
yangcq88517 0:c70b7ececf93 89 }
yangcq88517 0:c70b7ececf93 90
yangcq88517 0:c70b7ececf93 91 int32_t BME680::getCompensatePressure(int field)
yangcq88517 0:c70b7ececf93 92 {
yangcq88517 0:c70b7ececf93 93 uint32_t v_uncomp_pressure_u32 = getPressureData(field);
yangcq88517 0:c70b7ececf93 94
yangcq88517 0:c70b7ececf93 95 int32_t var1 = (((int32_t)t_fine) >> 1) - 64000;
yangcq88517 0:c70b7ececf93 96 int32_t var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) * (int32_t)par_P6) >> 2;
yangcq88517 0:c70b7ececf93 97 var2 = var2 + ((var1 * (int32_t)par_P5) << 1);
yangcq88517 0:c70b7ececf93 98 var2 = (var2 >> 2) + ((int32_t)par_P4 << 16);
yangcq88517 0:c70b7ececf93 99 var1 = (((((var1 >> 2) * (var1 >> 2)) >> 13) *
yangcq88517 0:c70b7ececf93 100 ((int32_t)par_P3 << 5)) >> 3) +
yangcq88517 0:c70b7ececf93 101 (((int32_t)par_P2 * var1) >> 1);
yangcq88517 0:c70b7ececf93 102 var1 = var1 >> 18;
yangcq88517 0:c70b7ececf93 103 var1 = ((32768 + var1) * (int32_t)par_P1) >> 15;
yangcq88517 0:c70b7ececf93 104 int32_t pressure_comp = 1048576 - v_uncomp_pressure_u32;
yangcq88517 0:c70b7ececf93 105 pressure_comp = (int32_t)((pressure_comp - (var2 >> 12)) * ((int32_t)3125));
yangcq88517 0:c70b7ececf93 106 int32_t var4 = (1 << 31);
yangcq88517 0:c70b7ececf93 107 if (pressure_comp >= var4)
yangcq88517 0:c70b7ececf93 108 pressure_comp = ((pressure_comp / (int32_t)var1) << 1);
yangcq88517 0:c70b7ececf93 109 else
yangcq88517 0:c70b7ececf93 110 pressure_comp = ((pressure_comp << 1) / (int32_t)var1);
yangcq88517 0:c70b7ececf93 111 var1 = ((int32_t)par_P9 * (int32_t)(((pressure_comp >> 3) *
yangcq88517 0:c70b7ececf93 112 (pressure_comp >> 3)) >> 13)) >> 12;
yangcq88517 0:c70b7ececf93 113 var2 = ((int32_t)(pressure_comp >> 2) *
yangcq88517 0:c70b7ececf93 114 (int32_t)par_P8) >> 13;
yangcq88517 0:c70b7ececf93 115 int32_t var3 = ((int32_t)(pressure_comp >> 8) * (int32_t)(pressure_comp >> 8) *
yangcq88517 0:c70b7ececf93 116 (int32_t)(pressure_comp >> 8) *
yangcq88517 0:c70b7ececf93 117 (int32_t)par_P10) >> 17;
yangcq88517 0:c70b7ececf93 118
yangcq88517 0:c70b7ececf93 119 pressure_comp = (int32_t)(pressure_comp) + ((var1 + var2 + var3 +
yangcq88517 0:c70b7ececf93 120 ((int32_t)par_P7 << 7)) >> 4);
yangcq88517 0:c70b7ececf93 121
yangcq88517 0:c70b7ececf93 122 return pressure_comp;
yangcq88517 0:c70b7ececf93 123 }
yangcq88517 0:c70b7ececf93 124
yangcq88517 0:c70b7ececf93 125 uint32_t BME680::getPressureInt(int field)
yangcq88517 0:c70b7ececf93 126 {
yangcq88517 0:c70b7ececf93 127 uint32_t pressure = (uint32_t)getCompensatePressure(field);
yangcq88517 0:c70b7ececf93 128 pressure = (uint32_t)(pressure >> 1);
yangcq88517 0:c70b7ececf93 129 return pressure;
yangcq88517 0:c70b7ececf93 130 }
yangcq88517 0:c70b7ececf93 131
yangcq88517 0:c70b7ececf93 132 uint8_t BME680::convertTemperatureResistanceInt(uint16_t heater, int16_t ambient)
yangcq88517 0:c70b7ececf93 133 {
yangcq88517 0:c70b7ececf93 134 uint8_t res_heat = 0;
yangcq88517 0:c70b7ececf93 135
yangcq88517 0:c70b7ececf93 136
yangcq88517 0:c70b7ececf93 137 if ((heater >= BME680_GAS_PROFILE_TEMPERATURE_MIN)
yangcq88517 0:c70b7ececf93 138 && (heater <= BME680_GAS_PROFILE_TEMPERATURE_MAX)) {
yangcq88517 0:c70b7ececf93 139
yangcq88517 0:c70b7ececf93 140 int32_t var1 = (((int32_t)ambient * par_GH3) / 10) << 8;
yangcq88517 0:c70b7ececf93 141 int32_t var2 = (par_GH1 + 784) *
yangcq88517 0:c70b7ececf93 142 (((((par_GH2 + 154009) *
yangcq88517 0:c70b7ececf93 143 heater * 5) / 100) + 3276800) / 10);
yangcq88517 0:c70b7ececf93 144 int32_t var3 = var1 + (var2 >> 1);
yangcq88517 0:c70b7ececf93 145 int32_t var4 = (var3 / (res_heat_range + 4));
yangcq88517 0:c70b7ececf93 146
yangcq88517 0:c70b7ececf93 147 int32_t var5 = (131 * res_heat_val) + 65536;
yangcq88517 0:c70b7ececf93 148
yangcq88517 0:c70b7ececf93 149 int32_t res_heat_x100 = (int32_t)(((var4 / var5) - 250) * 34);
yangcq88517 0:c70b7ececf93 150 res_heat = (uint8_t) ((res_heat_x100 + 50) / 100);
yangcq88517 0:c70b7ececf93 151
yangcq88517 0:c70b7ececf93 152 }
yangcq88517 0:c70b7ececf93 153 return res_heat;
yangcq88517 0:c70b7ececf93 154 }
yangcq88517 0:c70b7ececf93 155
yangcq88517 0:c70b7ececf93 156 int32_t BME680::getCalculateGasInt(int field)
yangcq88517 0:c70b7ececf93 157 {
yangcq88517 0:c70b7ececf93 158 uint8_t gas_range_u8 = getGasResistanceRange(field);
yangcq88517 0:c70b7ececf93 159 uint16_t gas_adc_u16 = getGasResistanceData(field);
yangcq88517 0:c70b7ececf93 160
yangcq88517 0:c70b7ececf93 161 int64_t var1 = (int64_t)((1340 + (5 * (int64_t)range_switching_error)) *
yangcq88517 0:c70b7ececf93 162 ((int64_t)lookup_k1_range[gas_range_u8])) >> 16;
yangcq88517 0:c70b7ececf93 163 int64_t var2 = (int64_t)((int64_t)gas_adc_u16 << 15) - (int64_t)(1 << 24) + var1;
yangcq88517 0:c70b7ececf93 164 int32_t gas_res = (int32_t)(((((int64_t)lookup_k2_range[gas_range_u8] *
yangcq88517 0:c70b7ececf93 165 (int64_t)var1) >> 9) + (var2 >> 1)) / var2);
yangcq88517 0:c70b7ececf93 166 return gas_res;
yangcq88517 0:c70b7ececf93 167 }
yangcq88517 0:c70b7ececf93 168
yangcq88517 0:c70b7ececf93 169 #else
yangcq88517 0:c70b7ececf93 170 double BME680::getTemperatureDouble(int field)
yangcq88517 0:c70b7ececf93 171 {
yangcq88517 0:c70b7ececf93 172 uint32_t uncom_temperature_u32 = getTemp1Data(field);
yangcq88517 0:c70b7ececf93 173
yangcq88517 0:c70b7ececf93 174 double data1_d = ((((double)uncom_temperature_u32 / 16384.0)
yangcq88517 0:c70b7ececf93 175 - ((double)par_T1 / 1024.0))
yangcq88517 0:c70b7ececf93 176 * ((double)par_T2));
yangcq88517 0:c70b7ececf93 177 /* calculate x2 data */
yangcq88517 0:c70b7ececf93 178 double data2_d = (((((double)uncom_temperature_u32 / 131072.0) -
yangcq88517 0:c70b7ececf93 179 ((double)par_T1 / 8192.0)) *
yangcq88517 0:c70b7ececf93 180 (((double)uncom_temperature_u32 / 131072.0) -
yangcq88517 0:c70b7ececf93 181 ((double)par_T1 / 8192.0))) *
yangcq88517 0:c70b7ececf93 182 ((double)par_T3 * 16.0));
yangcq88517 0:c70b7ececf93 183 /* t fine value*/
yangcq88517 0:c70b7ececf93 184 t_fine = (int32_t)(data1_d + data2_d);
yangcq88517 0:c70b7ececf93 185 /* compensated temperature data*/
yangcq88517 0:c70b7ececf93 186 return (data1_d + data2_d) / 5120.0;
yangcq88517 0:c70b7ececf93 187 }
yangcq88517 0:c70b7ececf93 188
yangcq88517 0:c70b7ececf93 189 double BME680::getHumidityDouble(int field)
yangcq88517 0:c70b7ececf93 190 {
yangcq88517 0:c70b7ececf93 191 double comp_temperature = getTemperatureDouble(field);
yangcq88517 0:c70b7ececf93 192 uint16_t uncom_humidity_u16 = getHumidityData(field);
yangcq88517 0:c70b7ececf93 193
yangcq88517 0:c70b7ececf93 194 double var1 = (double)((double)uncom_humidity_u16) - (((double)
yangcq88517 0:c70b7ececf93 195 par_H1 * 16.0) +
yangcq88517 0:c70b7ececf93 196 (((double)par_H3 / 2.0)
yangcq88517 0:c70b7ececf93 197 * comp_temperature));
yangcq88517 0:c70b7ececf93 198
yangcq88517 0:c70b7ececf93 199 double var2 = var1 * ((double)(
yangcq88517 0:c70b7ececf93 200 ((double) par_H2 / 262144.0)
yangcq88517 0:c70b7ececf93 201 *(1.0 + (((double)par_H4 / 16384.0)
yangcq88517 0:c70b7ececf93 202 * comp_temperature) + (((double)par_H5
yangcq88517 0:c70b7ececf93 203 / 1048576.0) * comp_temperature
yangcq88517 0:c70b7ececf93 204 * comp_temperature))));
yangcq88517 0:c70b7ececf93 205 double var3 = (double) par_H6 / 16384.0;
yangcq88517 0:c70b7ececf93 206 double var4 = (double) par_H7 / 2097152.0;
yangcq88517 0:c70b7ececf93 207
yangcq88517 0:c70b7ececf93 208 double humidity_comp = var2 +
yangcq88517 0:c70b7ececf93 209 ((var3 + (var4 * comp_temperature)) * var2 * var2);
yangcq88517 0:c70b7ececf93 210 if (humidity_comp > BME680_MAX_HUMIDITY_VALUE)
yangcq88517 0:c70b7ececf93 211 humidity_comp = BME680_MAX_HUMIDITY_VALUE;
yangcq88517 0:c70b7ececf93 212 else if (humidity_comp < BME680_MIN_HUMIDITY_VALUE)
yangcq88517 0:c70b7ececf93 213 humidity_comp = BME680_MIN_HUMIDITY_VALUE;
yangcq88517 0:c70b7ececf93 214 return humidity_comp;
yangcq88517 0:c70b7ececf93 215 }
yangcq88517 0:c70b7ececf93 216
yangcq88517 0:c70b7ececf93 217 double BME680::getPressureDouble(int field)
yangcq88517 0:c70b7ececf93 218 {
yangcq88517 0:c70b7ececf93 219 uint32_t uncom_pressure_u32 = getPressureData(field);
yangcq88517 0:c70b7ececf93 220
yangcq88517 0:c70b7ececf93 221 double data1_d = (((double)t_fine / 2.0) - 64000.0);
yangcq88517 0:c70b7ececf93 222 double data2_d = data1_d * data1_d * (((double)par_P6) / (131072.0));
yangcq88517 0:c70b7ececf93 223 data2_d = data2_d + (data1_d * ((double)par_P5) * 2.0);
yangcq88517 0:c70b7ececf93 224 data2_d = (data2_d / 4.0) + (((double)par_P4) * 65536.0);
yangcq88517 0:c70b7ececf93 225 data1_d = (((((double)par_P3 * data1_d * data1_d) / 16384.0) + ((double)par_P2 * data1_d)) / 524288.0);
yangcq88517 0:c70b7ececf93 226 data1_d = ((1.0 + (data1_d / 32768.0)) * ((double)par_P1));
yangcq88517 0:c70b7ececf93 227 double pressure_comp = (1048576.0 - ((double)uncom_pressure_u32));
yangcq88517 0:c70b7ececf93 228 /* Avoid exception caused by division by zero */
yangcq88517 0:c70b7ececf93 229 if ((int)data1_d != 0) {
yangcq88517 0:c70b7ececf93 230 pressure_comp = (((pressure_comp - (data2_d / 4096.0)) * 6250.0) / data1_d);
yangcq88517 0:c70b7ececf93 231 data1_d = (((double)par_P9) * pressure_comp * pressure_comp) / 2147483648.0;
yangcq88517 0:c70b7ececf93 232 data2_d = pressure_comp * (((double)par_P8) / 32768.0);
yangcq88517 0:c70b7ececf93 233 double data3_d = ((pressure_comp / 256.0) * (pressure_comp / 256.0) * (pressure_comp / 256.0) * (par_P10 / 131072.0));
yangcq88517 0:c70b7ececf93 234 pressure_comp = (pressure_comp + (data1_d + data2_d + data3_d + ((double)par_P7 * 128.0)) / 16.0);
yangcq88517 0:c70b7ececf93 235 return pressure_comp;
yangcq88517 0:c70b7ececf93 236 } else
yangcq88517 0:c70b7ececf93 237 return 0;
yangcq88517 0:c70b7ececf93 238 }
yangcq88517 0:c70b7ececf93 239
yangcq88517 0:c70b7ececf93 240 double BME680::convertTemperatureResistanceDouble(uint16_t heater, int16_t ambient)
yangcq88517 0:c70b7ececf93 241 {
yangcq88517 0:c70b7ececf93 242 double var1 = 0;
yangcq88517 0:c70b7ececf93 243 double var2 = 0;
yangcq88517 0:c70b7ececf93 244 double var3 = 0;
yangcq88517 0:c70b7ececf93 245 double var4 = 0;
yangcq88517 0:c70b7ececf93 246 double var5 = 0;
yangcq88517 0:c70b7ececf93 247 double res_heat = 0;
yangcq88517 0:c70b7ececf93 248
yangcq88517 0:c70b7ececf93 249 if ((heater >= BME680_GAS_PROFILE_TEMPERATURE_MIN)
yangcq88517 0:c70b7ececf93 250 && (heater <= BME680_GAS_PROFILE_TEMPERATURE_MAX)) {
yangcq88517 0:c70b7ececf93 251 #ifdef HEATER_C1_ENABLE
yangcq88517 0:c70b7ececf93 252 var1 = (((double)par_GH1 / (16.0)) + 49.0);
yangcq88517 0:c70b7ececf93 253 var2 = ((((double)par_GH2 / (32768.0)) * (0.0005)) + 0.00235);
yangcq88517 0:c70b7ececf93 254 #endif
yangcq88517 0:c70b7ececf93 255 var3 = ((double)par_GH3 / (1024.0));
yangcq88517 0:c70b7ececf93 256 var4 = (var1 * (1.0 + (var2 * (double)heater)));
yangcq88517 0:c70b7ececf93 257 var5 = (var4 + (var3 * (double)ambient));
yangcq88517 0:c70b7ececf93 258
yangcq88517 0:c70b7ececf93 259 #ifdef HEATER_C1_ENABLE
yangcq88517 0:c70b7ececf93 260 res_heat = (uint8_t)(3.4 * ((var5 * (4 / (4 + (double)res_heat_range)) * (1/(1 + ((double)res_heat_val * 0.002)))) - 25));
yangcq88517 0:c70b7ececf93 261 #else
yangcq88517 0:c70b7ececf93 262 res_heat = (((var5 * (4.0 / (4.0 + (double)res_heat_range))) - 25.0) * 3.4);
yangcq88517 0:c70b7ececf93 263 #endif
yangcq88517 0:c70b7ececf93 264
yangcq88517 0:c70b7ececf93 265 }
yangcq88517 0:c70b7ececf93 266 return (uint8_t)res_heat;
yangcq88517 0:c70b7ececf93 267 }
yangcq88517 0:c70b7ececf93 268
yangcq88517 0:c70b7ececf93 269 double BME680::getCalculateGasDouble(int field)
yangcq88517 0:c70b7ececf93 270 {
yangcq88517 0:c70b7ececf93 271 uint8_t gas_range_u8 = getGasResistanceRange(field);
yangcq88517 0:c70b7ececf93 272 uint16_t gas_adc_u16 = getGasResistanceData(field);
yangcq88517 0:c70b7ececf93 273 double gas_res_d = 0;
yangcq88517 0:c70b7ececf93 274
yangcq88517 0:c70b7ececf93 275
yangcq88517 0:c70b7ececf93 276 #ifdef HEATER_C1_ENABLE
yangcq88517 0:c70b7ececf93 277
yangcq88517 0:c70b7ececf93 278 double var1 = 0;
yangcq88517 0:c70b7ececf93 279 double var2 = 0;
yangcq88517 0:c70b7ececf93 280 double var3 = 0;
yangcq88517 0:c70b7ececf93 281
yangcq88517 0:c70b7ececf93 282
yangcq88517 0:c70b7ececf93 283 var1 = (1340.0 + (5.0 * range_switching_error));
yangcq88517 0:c70b7ececf93 284 var2 = (var1) * (1.0 + _lookup_k1_range[gas_range_u8]/100.0);
yangcq88517 0:c70b7ececf93 285 var3 = 1.0 + (_lookup_k2_range[gas_range_u8]/100.0);
yangcq88517 0:c70b7ececf93 286
yangcq88517 0:c70b7ececf93 287 gas_res_d = 1.0 / (double)(var3 * (0.000000125) *
yangcq88517 0:c70b7ececf93 288 (double)(1 << gas_range_u8)
yangcq88517 0:c70b7ececf93 289 * (((((double)gas_adc_u16) - 512.00)/var2) + 1.0));
yangcq88517 0:c70b7ececf93 290
yangcq88517 0:c70b7ececf93 291 #else
yangcq88517 0:c70b7ececf93 292 gas_res_d = 1.0 / ((0.000000125) * (double)(1 << gas_range_u8) *
yangcq88517 0:c70b7ececf93 293 ((((double)(gas_adc_u16) - 512.00) / 1365.3333) + 1.0));
yangcq88517 0:c70b7ececf93 294 #endif
yangcq88517 0:c70b7ececf93 295 return gas_res_d;
yangcq88517 0:c70b7ececf93 296 }
yangcq88517 0:c70b7ececf93 297 #endif
yangcq88517 0:c70b7ececf93 298
yangcq88517 0:c70b7ececf93 299
yangcq88517 0:c70b7ececf93 300
yangcq88517 0:c70b7ececf93 301 BME680::BME680(PinName sda, PinName scl, bool SDO)
yangcq88517 0:c70b7ececf93 302 :_i2c_bus(sda, scl)
yangcq88517 0:c70b7ececf93 303 {
yangcq88517 0:c70b7ececf93 304 if (SDO)
yangcq88517 0:c70b7ececf93 305 _addr = 0x77 << 1;
yangcq88517 0:c70b7ececf93 306 else _addr = 0x76 << 1;
yangcq88517 0:c70b7ececf93 307
yangcq88517 0:c70b7ececf93 308 _i2c_bus.frequency(FREQUENCY_FAST);
yangcq88517 0:c70b7ececf93 309 }
yangcq88517 0:c70b7ececf93 310
yangcq88517 0:c70b7ececf93 311 bool BME680::init()
yangcq88517 0:c70b7ececf93 312 {
yangcq88517 0:c70b7ececf93 313 if (getChipID() != 0x61)
yangcq88517 0:c70b7ececf93 314 return false;
yangcq88517 0:c70b7ececf93 315
yangcq88517 0:c70b7ececf93 316 uint8_t cali[41];
yangcq88517 0:c70b7ececf93 317 readRegister(0x89, 25);
yangcq88517 0:c70b7ececf93 318 memcpy(cali, data, 25);
yangcq88517 0:c70b7ececf93 319 readRegister(0xE1, 16);
yangcq88517 0:c70b7ececf93 320 memcpy(cali + 25, data, 16);
yangcq88517 0:c70b7ececf93 321
yangcq88517 0:c70b7ececf93 322 /* read temperature calibration*/
yangcq88517 0:c70b7ececf93 323 par_T1 = (cali[DIG_T1_MSB_REG] << 8) | cali[DIG_T1_LSB_REG];
yangcq88517 0:c70b7ececf93 324 par_T2 = (cali[DIG_T2_MSB_REG] << 8) | cali[DIG_T2_LSB_REG];
yangcq88517 0:c70b7ececf93 325 par_T3 = cali[DIG_T3_REG];
yangcq88517 0:c70b7ececf93 326
yangcq88517 0:c70b7ececf93 327 /* read pressure calibration*/
yangcq88517 0:c70b7ececf93 328 par_P1 = (cali[DIG_P1_MSB_REG] << 8) | cali[DIG_P1_LSB_REG];
yangcq88517 0:c70b7ececf93 329 par_P2 = (cali[DIG_P2_MSB_REG] << 8) | cali[DIG_P2_LSB_REG];
yangcq88517 0:c70b7ececf93 330 par_P3 = cali[DIG_P3_REG];
yangcq88517 0:c70b7ececf93 331 par_P4 = (cali[DIG_P4_MSB_REG] << 8) | cali[DIG_P4_LSB_REG];
yangcq88517 0:c70b7ececf93 332 par_P5 = (cali[DIG_P5_MSB_REG] << 8) | cali[DIG_P5_LSB_REG];
yangcq88517 0:c70b7ececf93 333 par_P6 = cali[DIG_P6_REG];
yangcq88517 0:c70b7ececf93 334 par_P7 = cali[DIG_P7_REG];
yangcq88517 0:c70b7ececf93 335 par_P8 = (cali[DIG_P8_MSB_REG] << 8) | cali[DIG_P8_LSB_REG];
yangcq88517 0:c70b7ececf93 336 par_P9 = (cali[DIG_P9_MSB_REG] << 8) | cali[DIG_P9_LSB_REG];
yangcq88517 0:c70b7ececf93 337 par_P10 = cali[DIG_P10_REG];
yangcq88517 0:c70b7ececf93 338
yangcq88517 0:c70b7ececf93 339 /* read humidity calibration*/
yangcq88517 0:c70b7ececf93 340 par_H1 = (cali[DIG_H1_MSB_REG] << 4) | (cali[DIG_H1_LSB_REG] & BME680_BIT_MASK_H1_DATA);
yangcq88517 0:c70b7ececf93 341 par_H2 = (cali[DIG_H2_MSB_REG] << 4) | (cali[DIG_H2_LSB_REG] >> 4);
yangcq88517 0:c70b7ececf93 342 par_H3 = cali[DIG_H3_REG];
yangcq88517 0:c70b7ececf93 343 par_H4 = cali[DIG_H4_REG];
yangcq88517 0:c70b7ececf93 344 par_H5 = cali[DIG_H5_REG];
yangcq88517 0:c70b7ececf93 345 par_H6 = cali[DIG_H6_REG];
yangcq88517 0:c70b7ececf93 346 par_H7 = cali[DIG_H7_REG];
yangcq88517 0:c70b7ececf93 347
yangcq88517 0:c70b7ececf93 348 /* read gas calibration*/
yangcq88517 0:c70b7ececf93 349 par_GH1 = cali[DIG_GH1_REG];
yangcq88517 0:c70b7ececf93 350 par_GH2 = (cali[DIG_GH2_MSB_REG] <<8) | cali[DIG_GH2_LSB_REG];
yangcq88517 0:c70b7ececf93 351 par_GH3 = cali[DIG_GH3_REG];
yangcq88517 0:c70b7ececf93 352
yangcq88517 0:c70b7ececf93 353 /**<resistance calculation*/
yangcq88517 0:c70b7ececf93 354 readRegister(0x02);
yangcq88517 0:c70b7ececf93 355 res_heat_range = (data[0] >> 4) & 0x03;
yangcq88517 0:c70b7ececf93 356
yangcq88517 0:c70b7ececf93 357 /**<correction factor*/
yangcq88517 0:c70b7ececf93 358 readRegister(0x00);
yangcq88517 0:c70b7ececf93 359 res_heat_val = data[0];
yangcq88517 0:c70b7ececf93 360
yangcq88517 0:c70b7ececf93 361 /**<range switching error*/
yangcq88517 0:c70b7ececf93 362 readRegister(0x04);
yangcq88517 0:c70b7ececf93 363 range_switching_error = (data[0] & 0xF0) >> 4;
yangcq88517 0:c70b7ececf93 364 /*
yangcq88517 0:c70b7ececf93 365 uint16_t BME680::getParG1()
yangcq88517 0:c70b7ececf93 366 {
yangcq88517 0:c70b7ececf93 367 readRegister(0xEB, 2);
yangcq88517 0:c70b7ececf93 368 return (data[1] << 8) | data[0];
yangcq88517 0:c70b7ececf93 369 }
yangcq88517 0:c70b7ececf93 370
yangcq88517 0:c70b7ececf93 371 uint8_t BME680::getParG2()
yangcq88517 0:c70b7ececf93 372 {
yangcq88517 0:c70b7ececf93 373 readRegister(0xED);
yangcq88517 0:c70b7ececf93 374 return data[0];
yangcq88517 0:c70b7ececf93 375 }
yangcq88517 0:c70b7ececf93 376
yangcq88517 0:c70b7ececf93 377 uint8_t BME680::getParG3()
yangcq88517 0:c70b7ececf93 378 {
yangcq88517 0:c70b7ececf93 379 readRegister(0xEE);
yangcq88517 0:c70b7ececf93 380 return data[0];
yangcq88517 0:c70b7ececf93 381 }
yangcq88517 0:c70b7ececf93 382 */
yangcq88517 0:c70b7ececf93 383 return true;
yangcq88517 0:c70b7ececf93 384 }
yangcq88517 0:c70b7ececf93 385
yangcq88517 0:c70b7ececf93 386 uint32_t BME680::getPressureData(int field)
yangcq88517 0:c70b7ececf93 387 {
yangcq88517 0:c70b7ececf93 388 readRegister(0x1F + field * 0x11, 3);
yangcq88517 0:c70b7ececf93 389 return (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
yangcq88517 0:c70b7ececf93 390 }
yangcq88517 0:c70b7ececf93 391
yangcq88517 0:c70b7ececf93 392 uint32_t BME680::getTemp1Data(int field)
yangcq88517 0:c70b7ececf93 393 {
yangcq88517 0:c70b7ececf93 394 readRegister(0x22 + field * 0x11, 3);
yangcq88517 0:c70b7ececf93 395 return (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
yangcq88517 0:c70b7ececf93 396 }
yangcq88517 0:c70b7ececf93 397
yangcq88517 0:c70b7ececf93 398 uint32_t BME680::getHumidityData(int field)
yangcq88517 0:c70b7ececf93 399 {
yangcq88517 0:c70b7ececf93 400 readRegister(0x25 + field * 0x11, 2);
yangcq88517 0:c70b7ececf93 401 return (data[0] << 8) | data[1];
yangcq88517 0:c70b7ececf93 402 }
yangcq88517 0:c70b7ececf93 403
yangcq88517 0:c70b7ececf93 404 uint16_t BME680::getGasResistanceData(int field)
yangcq88517 0:c70b7ececf93 405 {
yangcq88517 0:c70b7ececf93 406 readRegister(0x2A + field * 0x11, 2);
yangcq88517 0:c70b7ececf93 407 return (data[0] << 2) | (data[1] >> 6);
yangcq88517 0:c70b7ececf93 408 }
yangcq88517 0:c70b7ececf93 409
yangcq88517 0:c70b7ececf93 410 uint8_t BME680::getGasResistanceRange(int field)
yangcq88517 0:c70b7ececf93 411 {
yangcq88517 0:c70b7ececf93 412 readRegister(0x2B + field * 0x11);
yangcq88517 0:c70b7ececf93 413 return data[0] & 0x0F;
yangcq88517 0:c70b7ececf93 414 }
yangcq88517 0:c70b7ececf93 415
yangcq88517 0:c70b7ececf93 416 bool BME680::isNewData(int field)
yangcq88517 0:c70b7ececf93 417 {
yangcq88517 0:c70b7ececf93 418 readRegister(0x1D + field * 0x11);
yangcq88517 0:c70b7ececf93 419 return (data[0] & 0x80) == 0x80 ? true : false;
yangcq88517 0:c70b7ececf93 420 }
yangcq88517 0:c70b7ececf93 421
yangcq88517 0:c70b7ececf93 422 bool BME680::isGasMeasuring(int field)
yangcq88517 0:c70b7ececf93 423 {
yangcq88517 0:c70b7ececf93 424 readRegister(0x1D + field * 0x11);
yangcq88517 0:c70b7ececf93 425 return (data[0] & 0x40) == 0x40 ? true : false;
yangcq88517 0:c70b7ececf93 426 }
yangcq88517 0:c70b7ececf93 427
yangcq88517 0:c70b7ececf93 428 bool BME680::isMeasuring(int field)
yangcq88517 0:c70b7ececf93 429 {
yangcq88517 0:c70b7ececf93 430 readRegister(0x1D + field * 0x11);
yangcq88517 0:c70b7ececf93 431 return (data[0] & 0x20) == 0x20 ? true : false;
yangcq88517 0:c70b7ececf93 432 }
yangcq88517 0:c70b7ececf93 433
yangcq88517 0:c70b7ececf93 434 int BME680::getGasMeasurementIndex(int field)
yangcq88517 0:c70b7ececf93 435 {
yangcq88517 0:c70b7ececf93 436 readRegister(0x1D + field * 0x11);
yangcq88517 0:c70b7ececf93 437 return data[0] & 0x0F;
yangcq88517 0:c70b7ececf93 438 }
yangcq88517 0:c70b7ececf93 439
yangcq88517 0:c70b7ececf93 440 int BME680::getSubMeasurementIndex(int field)
yangcq88517 0:c70b7ececf93 441 {
yangcq88517 0:c70b7ececf93 442 readRegister(0x1E + field * 0x11);
yangcq88517 0:c70b7ececf93 443 return data[0];
yangcq88517 0:c70b7ececf93 444 }
yangcq88517 0:c70b7ececf93 445
yangcq88517 0:c70b7ececf93 446 bool BME680::isGasValid(int field)
yangcq88517 0:c70b7ececf93 447 {
yangcq88517 0:c70b7ececf93 448 readRegister(0x2B + field * 0x11);
yangcq88517 0:c70b7ececf93 449 return (data[0] & 0x20) == 0x20 ? true : false;
yangcq88517 0:c70b7ececf93 450 }
yangcq88517 0:c70b7ececf93 451
yangcq88517 0:c70b7ececf93 452 bool BME680::isHeaterStable(int field)
yangcq88517 0:c70b7ececf93 453 {
yangcq88517 0:c70b7ececf93 454 readRegister(0x2B + field * 0x11);
yangcq88517 0:c70b7ececf93 455 return (data[0] & 0x10) == 0x10 ? true : false;
yangcq88517 0:c70b7ececf93 456 }
yangcq88517 0:c70b7ececf93 457
yangcq88517 0:c70b7ececf93 458 uint8_t BME680::getHeaterCurrent(int setPoint)
yangcq88517 0:c70b7ececf93 459 {
yangcq88517 0:c70b7ececf93 460 readRegister(0x50 + setPoint);
yangcq88517 0:c70b7ececf93 461 return data[0] >> 1;
yangcq88517 0:c70b7ececf93 462 }
yangcq88517 0:c70b7ececf93 463
yangcq88517 0:c70b7ececf93 464 void BME680::setHeaterCurrent(int setPoint, uint8_t value)
yangcq88517 0:c70b7ececf93 465 {
yangcq88517 0:c70b7ececf93 466 writeRegister(0x50 + setPoint, value << 1);
yangcq88517 0:c70b7ececf93 467 }
yangcq88517 0:c70b7ececf93 468
yangcq88517 0:c70b7ececf93 469 int8_t BME680::getTargetHeaterResistance(int setPoint)
yangcq88517 0:c70b7ececf93 470 {
yangcq88517 0:c70b7ececf93 471 readRegister(0x5A + setPoint);
yangcq88517 0:c70b7ececf93 472 return data[0];
yangcq88517 0:c70b7ececf93 473 }
yangcq88517 0:c70b7ececf93 474
yangcq88517 0:c70b7ececf93 475 void BME680::setTargetHeaterResistance(int setPoint, int8_t value)
yangcq88517 0:c70b7ececf93 476 {
yangcq88517 0:c70b7ececf93 477 writeRegister(0x5A + setPoint, value);
yangcq88517 0:c70b7ececf93 478 }
yangcq88517 0:c70b7ececf93 479
yangcq88517 0:c70b7ececf93 480 int BME680::getGasWaitTime(int setPoint)
yangcq88517 0:c70b7ececf93 481 {
yangcq88517 0:c70b7ececf93 482 readRegister(0x64 + setPoint);
yangcq88517 0:c70b7ececf93 483 return (data[0] & 0x3F) * (data[0] >> 6);
yangcq88517 0:c70b7ececf93 484 }
yangcq88517 0:c70b7ececf93 485
yangcq88517 0:c70b7ececf93 486 void BME680::setGasWaitTime(int setPoint, int time, int multiplication)
yangcq88517 0:c70b7ececf93 487 {
yangcq88517 0:c70b7ececf93 488 writeRegister(0x64 + setPoint, (multiplication << 6) | (time & 0x3F));
yangcq88517 0:c70b7ececf93 489 }
yangcq88517 0:c70b7ececf93 490
yangcq88517 0:c70b7ececf93 491 int BME680::getGasWaitShared()
yangcq88517 0:c70b7ececf93 492 {
yangcq88517 0:c70b7ececf93 493 readRegister(0x6E);
yangcq88517 0:c70b7ececf93 494 return (data[0] & 0x1F) * (data[0] >> 6);
yangcq88517 0:c70b7ececf93 495 }
yangcq88517 0:c70b7ececf93 496
yangcq88517 0:c70b7ececf93 497 void BME680::setGasWaitShared(int time, int multiplication)
yangcq88517 0:c70b7ececf93 498 {
yangcq88517 0:c70b7ececf93 499 writeRegister(0x6E, (multiplication << 6) | (time & 0x1F));
yangcq88517 0:c70b7ececf93 500 }
yangcq88517 0:c70b7ececf93 501
yangcq88517 0:c70b7ececf93 502 void BME680::setHeaterOff()
yangcq88517 0:c70b7ececf93 503 {
yangcq88517 0:c70b7ececf93 504 readRegister(0x70);
yangcq88517 0:c70b7ececf93 505 data[0] |= 0x08;
yangcq88517 0:c70b7ececf93 506 writeRegister(0x70, data[0]);
yangcq88517 0:c70b7ececf93 507 }
yangcq88517 0:c70b7ececf93 508
yangcq88517 0:c70b7ececf93 509 int BME680::getHeaterProfile()
yangcq88517 0:c70b7ececf93 510 {
yangcq88517 0:c70b7ececf93 511 readRegister(0x70);
yangcq88517 0:c70b7ececf93 512 return data[0] &= 0x08;
yangcq88517 0:c70b7ececf93 513 }
yangcq88517 0:c70b7ececf93 514
yangcq88517 0:c70b7ececf93 515 void BME680::setHeaterProfile(int vlaue)
yangcq88517 0:c70b7ececf93 516 {
yangcq88517 0:c70b7ececf93 517 readRegister(0x71);
yangcq88517 0:c70b7ececf93 518 data[0] &= 0xF0;
yangcq88517 0:c70b7ececf93 519 data[0] |= vlaue & 0x0F;
yangcq88517 0:c70b7ececf93 520 writeRegister(0x71, data[0]);
yangcq88517 0:c70b7ececf93 521 }
yangcq88517 0:c70b7ececf93 522
yangcq88517 0:c70b7ececf93 523 void BME680::runGasConversion()
yangcq88517 0:c70b7ececf93 524 {
yangcq88517 0:c70b7ececf93 525 readRegister(0x71);
yangcq88517 0:c70b7ececf93 526 data[0] |= 0x10;
yangcq88517 0:c70b7ececf93 527 writeRegister(0x71, data[0]);
yangcq88517 0:c70b7ececf93 528 }
yangcq88517 0:c70b7ececf93 529
yangcq88517 0:c70b7ececf93 530 float BME680::getWakePeriod()
yangcq88517 0:c70b7ececf93 531 {
yangcq88517 0:c70b7ececf93 532 readRegister(0x71);
yangcq88517 0:c70b7ececf93 533 int temp = (data[0] & 0x80) >> 4;
yangcq88517 0:c70b7ececf93 534 readRegister(0x75);
yangcq88517 0:c70b7ececf93 535 temp |= data[0] >> 5;
yangcq88517 0:c70b7ececf93 536
yangcq88517 0:c70b7ececf93 537 switch(temp) {
yangcq88517 0:c70b7ececf93 538 case 0:
yangcq88517 0:c70b7ececf93 539 return 0.59f;
yangcq88517 0:c70b7ececf93 540 case 1:
yangcq88517 0:c70b7ececf93 541 return 62.5f;
yangcq88517 0:c70b7ececf93 542 case 2:
yangcq88517 0:c70b7ececf93 543 return 125;
yangcq88517 0:c70b7ececf93 544 case 3:
yangcq88517 0:c70b7ececf93 545 return 250;
yangcq88517 0:c70b7ececf93 546 case 4:
yangcq88517 0:c70b7ececf93 547 return 500;
yangcq88517 0:c70b7ececf93 548 case 5:
yangcq88517 0:c70b7ececf93 549 return 1000;
yangcq88517 0:c70b7ececf93 550 case 6:
yangcq88517 0:c70b7ececf93 551 return 10;
yangcq88517 0:c70b7ececf93 552 case 7:
yangcq88517 0:c70b7ececf93 553 return 20;
yangcq88517 0:c70b7ececf93 554 default:
yangcq88517 0:c70b7ececf93 555 return 0;
yangcq88517 0:c70b7ececf93 556 }
yangcq88517 0:c70b7ececf93 557 }
yangcq88517 0:c70b7ececf93 558
yangcq88517 0:c70b7ececf93 559 void BME680::setWakePeriod(int value)
yangcq88517 0:c70b7ececf93 560 {
yangcq88517 0:c70b7ececf93 561 readRegister(0x71);
yangcq88517 0:c70b7ececf93 562 data[0] = (data[0] & 0x7F) | ((value & 0x0F) >> 3);
yangcq88517 0:c70b7ececf93 563 writeRegister(0x71, data[0]);
yangcq88517 0:c70b7ececf93 564
yangcq88517 0:c70b7ececf93 565 readRegister(0x75);
yangcq88517 0:c70b7ececf93 566 data[0] = (data[0] & 0x1F) | ((value & 0x07) << 5);
yangcq88517 0:c70b7ececf93 567 writeRegister(0x75, data[0]);
yangcq88517 0:c70b7ececf93 568 }
yangcq88517 0:c70b7ececf93 569
yangcq88517 0:c70b7ececf93 570 int BME680::getOversamplingHumidity()
yangcq88517 0:c70b7ececf93 571 {
yangcq88517 0:c70b7ececf93 572 readRegister(0x72);
yangcq88517 0:c70b7ececf93 573 switch (data[0] & 0x07) {
yangcq88517 0:c70b7ececf93 574 case 0:
yangcq88517 0:c70b7ececf93 575 return 0;
yangcq88517 0:c70b7ececf93 576 case 1:
yangcq88517 0:c70b7ececf93 577 return 1;
yangcq88517 0:c70b7ececf93 578 case 2:
yangcq88517 0:c70b7ececf93 579 return 2;
yangcq88517 0:c70b7ececf93 580 case 3:
yangcq88517 0:c70b7ececf93 581 return 4;
yangcq88517 0:c70b7ececf93 582 case 4:
yangcq88517 0:c70b7ececf93 583 return 8;
yangcq88517 0:c70b7ececf93 584 case 5:
yangcq88517 0:c70b7ececf93 585 return 16;
yangcq88517 0:c70b7ececf93 586 }
yangcq88517 0:c70b7ececf93 587
yangcq88517 0:c70b7ececf93 588 return 0;
yangcq88517 0:c70b7ececf93 589 }
yangcq88517 0:c70b7ececf93 590
yangcq88517 0:c70b7ececf93 591 void BME680::setOversamplingHumidity(int value)
yangcq88517 0:c70b7ececf93 592 {
yangcq88517 0:c70b7ececf93 593 readRegister(0x72);
yangcq88517 0:c70b7ececf93 594 data[0] = (data[0] & 0xF8) | (value & 0x07);
yangcq88517 0:c70b7ececf93 595 writeRegister(0x72, data[0]);
yangcq88517 0:c70b7ececf93 596 }
yangcq88517 0:c70b7ececf93 597
yangcq88517 0:c70b7ececf93 598 int BME680::getOversamplingPressure()
yangcq88517 0:c70b7ececf93 599 {
yangcq88517 0:c70b7ececf93 600 readRegister(0x74);
yangcq88517 0:c70b7ececf93 601 switch ((data[0] & 0x1C) >> 2) {
yangcq88517 0:c70b7ececf93 602 case 0:
yangcq88517 0:c70b7ececf93 603 return 0;
yangcq88517 0:c70b7ececf93 604 case 1:
yangcq88517 0:c70b7ececf93 605 return 1;
yangcq88517 0:c70b7ececf93 606 case 2:
yangcq88517 0:c70b7ececf93 607 return 2;
yangcq88517 0:c70b7ececf93 608 case 3:
yangcq88517 0:c70b7ececf93 609 return 4;
yangcq88517 0:c70b7ececf93 610 case 4:
yangcq88517 0:c70b7ececf93 611 return 8;
yangcq88517 0:c70b7ececf93 612 case 5:
yangcq88517 0:c70b7ececf93 613 return 16;
yangcq88517 0:c70b7ececf93 614 }
yangcq88517 0:c70b7ececf93 615
yangcq88517 0:c70b7ececf93 616 return 0;
yangcq88517 0:c70b7ececf93 617 }
yangcq88517 0:c70b7ececf93 618
yangcq88517 0:c70b7ececf93 619 void BME680::setOversamplingPressure(int value)
yangcq88517 0:c70b7ececf93 620 {
yangcq88517 0:c70b7ececf93 621 readRegister(0x74);
yangcq88517 0:c70b7ececf93 622 data[0] = (data[0] & 0xE3) | ((value & 0x07) << 2);
yangcq88517 0:c70b7ececf93 623 writeRegister(0x74, data[0]);
yangcq88517 0:c70b7ececf93 624 }
yangcq88517 0:c70b7ececf93 625
yangcq88517 0:c70b7ececf93 626 int BME680::getOversamplingTemperature()
yangcq88517 0:c70b7ececf93 627 {
yangcq88517 0:c70b7ececf93 628 readRegister(0x74);
yangcq88517 0:c70b7ececf93 629 switch ((data[0] & 0xE0) >> 5) {
yangcq88517 0:c70b7ececf93 630 case 0:
yangcq88517 0:c70b7ececf93 631 return 0;
yangcq88517 0:c70b7ececf93 632 case 1:
yangcq88517 0:c70b7ececf93 633 return 1;
yangcq88517 0:c70b7ececf93 634 case 2:
yangcq88517 0:c70b7ececf93 635 return 2;
yangcq88517 0:c70b7ececf93 636 case 3:
yangcq88517 0:c70b7ececf93 637 return 4;
yangcq88517 0:c70b7ececf93 638 case 4:
yangcq88517 0:c70b7ececf93 639 return 8;
yangcq88517 0:c70b7ececf93 640 case 5:
yangcq88517 0:c70b7ececf93 641 return 16;
yangcq88517 0:c70b7ececf93 642 }
yangcq88517 0:c70b7ececf93 643
yangcq88517 0:c70b7ececf93 644 return 0;
yangcq88517 0:c70b7ececf93 645 }
yangcq88517 0:c70b7ececf93 646
yangcq88517 0:c70b7ececf93 647 void BME680::setOversamplingTemperature(int value)
yangcq88517 0:c70b7ececf93 648 {
yangcq88517 0:c70b7ececf93 649 readRegister(0x74);
yangcq88517 0:c70b7ececf93 650 data[0] = (data[0] & 0x1F) | ((value & 0x07) << 5);
yangcq88517 0:c70b7ececf93 651 writeRegister(0x74, data[0]);
yangcq88517 0:c70b7ececf93 652 }
yangcq88517 0:c70b7ececf93 653
yangcq88517 0:c70b7ececf93 654 int BME680::getIIRfilterCoefficient()
yangcq88517 0:c70b7ececf93 655 {
yangcq88517 0:c70b7ececf93 656 readRegister(0x75);
yangcq88517 0:c70b7ececf93 657 switch ((data[0] & 0x1C) >> 2) {
yangcq88517 0:c70b7ececf93 658 case 0:
yangcq88517 0:c70b7ececf93 659 return 0;
yangcq88517 0:c70b7ececf93 660 case 1:
yangcq88517 0:c70b7ececf93 661 return 1;
yangcq88517 0:c70b7ececf93 662 case 2:
yangcq88517 0:c70b7ececf93 663 return 3;
yangcq88517 0:c70b7ececf93 664 case 3:
yangcq88517 0:c70b7ececf93 665 return 7;
yangcq88517 0:c70b7ececf93 666 case 4:
yangcq88517 0:c70b7ececf93 667 return 15;
yangcq88517 0:c70b7ececf93 668 case 5:
yangcq88517 0:c70b7ececf93 669 return 31;
yangcq88517 0:c70b7ececf93 670 case 6:
yangcq88517 0:c70b7ececf93 671 return 63;
yangcq88517 0:c70b7ececf93 672 case 7:
yangcq88517 0:c70b7ececf93 673 return 127;
yangcq88517 0:c70b7ececf93 674 }
yangcq88517 0:c70b7ececf93 675 return 0;
yangcq88517 0:c70b7ececf93 676 }
yangcq88517 0:c70b7ececf93 677
yangcq88517 0:c70b7ececf93 678 void BME680::setIIRfilterCoefficient(int value)
yangcq88517 0:c70b7ececf93 679 {
yangcq88517 0:c70b7ececf93 680 readRegister(0x75);
yangcq88517 0:c70b7ececf93 681 data[0] = (data[0] & 0xE3) | ((value & 0x07) << 2);
yangcq88517 0:c70b7ececf93 682 writeRegister(0x75, data[0]);
yangcq88517 0:c70b7ececf93 683 }
yangcq88517 0:c70b7ececf93 684
yangcq88517 0:c70b7ececf93 685 int BME680::getMode()
yangcq88517 0:c70b7ececf93 686 {
yangcq88517 0:c70b7ececf93 687 readRegister(0x74);
yangcq88517 0:c70b7ececf93 688 return data[0] & 0x03;
yangcq88517 0:c70b7ececf93 689 }
yangcq88517 0:c70b7ececf93 690
yangcq88517 0:c70b7ececf93 691 void BME680::setMode(int mode)
yangcq88517 0:c70b7ececf93 692 {
yangcq88517 0:c70b7ececf93 693 readRegister(0x74);
yangcq88517 0:c70b7ececf93 694 data[0] = (data[0] & 0xFC) | (mode & 0x03);
yangcq88517 0:c70b7ececf93 695 writeRegister(0x74, data[0]);
yangcq88517 0:c70b7ececf93 696 }
yangcq88517 0:c70b7ececf93 697
yangcq88517 0:c70b7ececf93 698 int BME680::getChipID()
yangcq88517 0:c70b7ececf93 699 {
yangcq88517 0:c70b7ececf93 700 readRegister(0xD0);
yangcq88517 0:c70b7ececf93 701 return data[0];
yangcq88517 0:c70b7ececf93 702 }
yangcq88517 0:c70b7ececf93 703
yangcq88517 0:c70b7ececf93 704 void BME680::readRegister(int reg, int size)
yangcq88517 0:c70b7ececf93 705 {
yangcq88517 0:c70b7ececf93 706 _i2c_bus.start();
yangcq88517 0:c70b7ececf93 707 _i2c_bus.write(_addr);
yangcq88517 0:c70b7ececf93 708 _i2c_bus.write(reg);
yangcq88517 0:c70b7ececf93 709 _i2c_bus.start();
yangcq88517 0:c70b7ececf93 710 _i2c_bus.write(_addr | 0x01);
yangcq88517 0:c70b7ececf93 711 int i = 0;
yangcq88517 0:c70b7ececf93 712 for (; i< size -1; i++)
yangcq88517 0:c70b7ececf93 713 data[i] = _i2c_bus.read(1);
yangcq88517 0:c70b7ececf93 714 data[i] = _i2c_bus.read(0);
yangcq88517 0:c70b7ececf93 715 _i2c_bus.stop();
yangcq88517 0:c70b7ececf93 716 }
yangcq88517 0:c70b7ececf93 717
yangcq88517 0:c70b7ececf93 718 void BME680::writeRegister(int reg, int value)
yangcq88517 0:c70b7ececf93 719 {
yangcq88517 0:c70b7ececf93 720 _i2c_bus.start();
yangcq88517 0:c70b7ececf93 721 _i2c_bus.write(_addr);
yangcq88517 0:c70b7ececf93 722 _i2c_bus.write(reg);
yangcq88517 0:c70b7ececf93 723 _i2c_bus.write(value);
yangcq88517 0:c70b7ececf93 724 _i2c_bus.stop();
yangcq88517 0:c70b7ececf93 725 }