Lourdès Abou-tayeh / CCS811

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Dependents:   Capteur2

CCS811.cpp@0:2c1dce3543ae, 2021-09-06 (annotated)

Committer:
louatayehh
Date:
Mon Sep 06 09:17:14 2021 +0000
Revision:
0:2c1dce3543ae
Child:
1:d0abe05bc21e
Capteur 2 : CCS811

Who changed what in which revision?

UserRevisionLine numberNew contents of line
louatayehh 0:2c1dce3543ae 1 #include "CCS811.h"
louatayehh 0:2c1dce3543ae 2
louatayehh 0:2c1dce3543ae 3 // Constructeur
louatayehh 0:2c1dce3543ae 4 CCS811::CCS811(PinName sda, PinName scl) : _i2c(sda, scl) {}
louatayehh 0:2c1dce3543ae 5
louatayehh 0:2c1dce3543ae 6 /**
louatayehh 0:2c1dce3543ae 7 ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement.
louatayehh 0:2c1dce3543ae 8 **/
louatayehh 0:2c1dce3543ae 9
louatayehh 0:2c1dce3543ae 10 void CCS811::init()
louatayehh 0:2c1dce3543ae 11 {
louatayehh 0:2c1dce3543ae 12 wait_us(50);
louatayehh 0:2c1dce3543ae 13
louatayehh 0:2c1dce3543ae 14 char send[2];
louatayehh 0:2c1dce3543ae 15 char read[8];
louatayehh 0:2c1dce3543ae 16 char hwv[8];
louatayehh 0:2c1dce3543ae 17 char hwd[8];
louatayehh 0:2c1dce3543ae 18
louatayehh 0:2c1dce3543ae 19 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 20
louatayehh 0:2c1dce3543ae 21 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 22 _i2c.read(CCS811_I2C_ADDR, hwv, 1);
louatayehh 0:2c1dce3543ae 23
louatayehh 0:2c1dce3543ae 24 wait_us(50);
louatayehh 0:2c1dce3543ae 25
louatayehh 0:2c1dce3543ae 26 send[0] = CCS811_REG_APP_START; //0xF4
louatayehh 0:2c1dce3543ae 27
louatayehh 0:2c1dce3543ae 28 wait_us(50);
louatayehh 0:2c1dce3543ae 29
louatayehh 0:2c1dce3543ae 30 _i2c.write(CCS811_I2C_ADDR, send, 1);
louatayehh 0:2c1dce3543ae 31
louatayehh 0:2c1dce3543ae 32 wait_us(50);
louatayehh 0:2c1dce3543ae 33
louatayehh 0:2c1dce3543ae 34 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 35
louatayehh 0:2c1dce3543ae 36 wait_us(50);
louatayehh 0:2c1dce3543ae 37
louatayehh 0:2c1dce3543ae 38 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 39 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 40
louatayehh 0:2c1dce3543ae 41 wait_us(50);
louatayehh 0:2c1dce3543ae 42
louatayehh 0:2c1dce3543ae 43
louatayehh 0:2c1dce3543ae 44 send[0] = CCS811_REG_MEAS_MODE; //0x01
louatayehh 0:2c1dce3543ae 45 send[1] = CCS811_MEASUREMENT_MODE1; //0x10
louatayehh 0:2c1dce3543ae 46
louatayehh 0:2c1dce3543ae 47 _i2c.write(CCS811_I2C_ADDR, send, 2);
louatayehh 0:2c1dce3543ae 48 wait_us(50);
louatayehh 0:2c1dce3543ae 49
louatayehh 0:2c1dce3543ae 50 wait_us(50);
louatayehh 0:2c1dce3543ae 51
louatayehh 0:2c1dce3543ae 52
louatayehh 0:2c1dce3543ae 53 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 54
louatayehh 0:2c1dce3543ae 55 wait_us(50);
louatayehh 0:2c1dce3543ae 56
louatayehh 0:2c1dce3543ae 57
louatayehh 0:2c1dce3543ae 58 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 59 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 60
louatayehh 0:2c1dce3543ae 61 wait_us(50);
louatayehh 0:2c1dce3543ae 62 }
louatayehh 0:2c1dce3543ae 63
louatayehh 0:2c1dce3543ae 64 int CCS811::setMeasureMode(char mode)
louatayehh 0:2c1dce3543ae 65 {
louatayehh 0:2c1dce3543ae 66
louatayehh 0:2c1dce3543ae 67 char send[2];
louatayehh 0:2c1dce3543ae 68
louatayehh 0:2c1dce3543ae 69 send[0] = CCS811_REG_MEAS_MODE;
louatayehh 0:2c1dce3543ae 70 send[1] = mode;
louatayehh 0:2c1dce3543ae 71
louatayehh 0:2c1dce3543ae 72 _i2c.write(CCS811_I2C_ADDR, send, 2);
louatayehh 0:2c1dce3543ae 73
louatayehh 0:2c1dce3543ae 74 // send[0] = CCS811_REG_APP_START;
louatayehh 0:2c1dce3543ae 75 // send[1] = 0x00;
louatayehh 0:2c1dce3543ae 76
louatayehh 0:2c1dce3543ae 77 // _i2c.write(CCS811_I2C_ADDR, send, 2);
louatayehh 0:2c1dce3543ae 78
louatayehh 0:2c1dce3543ae 79 return 0;
louatayehh 0:2c1dce3543ae 80 }
louatayehh 0:2c1dce3543ae 81
louatayehh 0:2c1dce3543ae 82 bool CCS811::readstatus()
louatayehh 0:2c1dce3543ae 83 {
louatayehh 0:2c1dce3543ae 84
louatayehh 0:2c1dce3543ae 85 char read[8];
louatayehh 0:2c1dce3543ae 86 char hwd[8];
louatayehh 0:2c1dce3543ae 87
louatayehh 0:2c1dce3543ae 88 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 89
louatayehh 0:2c1dce3543ae 90 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 91 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 92
louatayehh 0:2c1dce3543ae 93 printf("STATUS 0x%X\r\n", hwd[0]);
louatayehh 0:2c1dce3543ae 94
louatayehh 0:2c1dce3543ae 95 return 0;
louatayehh 0:2c1dce3543ae 96 }
louatayehh 0:2c1dce3543ae 97
louatayehh 0:2c1dce3543ae 98 bool CCS811::readmeas()
louatayehh 0:2c1dce3543ae 99 {
louatayehh 0:2c1dce3543ae 100
louatayehh 0:2c1dce3543ae 101 char read[8];
louatayehh 0:2c1dce3543ae 102 char hwd[8];
louatayehh 0:2c1dce3543ae 103
louatayehh 0:2c1dce3543ae 104 read[0] = CCS811_REG_MEAS_MODE; //0x01
louatayehh 0:2c1dce3543ae 105
louatayehh 0:2c1dce3543ae 106 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 107 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 108
louatayehh 0:2c1dce3543ae 109 printf("meas 0x%X\r\n", hwd[0]);
louatayehh 0:2c1dce3543ae 110
louatayehh 0:2c1dce3543ae 111 return 0;
louatayehh 0:2c1dce3543ae 112 }
louatayehh 0:2c1dce3543ae 113
louatayehh 0:2c1dce3543ae 114 bool CCS811::readerror()
louatayehh 0:2c1dce3543ae 115 {
louatayehh 0:2c1dce3543ae 116
louatayehh 0:2c1dce3543ae 117 char read[8];
louatayehh 0:2c1dce3543ae 118 char hwv[8];
louatayehh 0:2c1dce3543ae 119
louatayehh 0:2c1dce3543ae 120 read[0] = CCS811_REG_ERROR_ID; //0xE0
louatayehh 0:2c1dce3543ae 121
louatayehh 0:2c1dce3543ae 122 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 123 _i2c.read(CCS811_I2C_ADDR, hwv, 1);
louatayehh 0:2c1dce3543ae 124
louatayehh 0:2c1dce3543ae 125 printf("error 0x%X \r\n", hwv[0]);
louatayehh 0:2c1dce3543ae 126
louatayehh 0:2c1dce3543ae 127 return 0;
louatayehh 0:2c1dce3543ae 128 }
louatayehh 0:2c1dce3543ae 129
louatayehh 0:2c1dce3543ae 130 //Lecture de CCS811 : taux de CO2 en ppm et taux de tvos en bbm (unsigned)
louatayehh 0:2c1dce3543ae 131
louatayehh 0:2c1dce3543ae 132 int CCS811::readData(uint16_t *ECO2, uint16_t *TVOC)
louatayehh 0:2c1dce3543ae 133 {
louatayehh 0:2c1dce3543ae 134 char recv[8];
louatayehh 0:2c1dce3543ae 135 char send[1];
louatayehh 0:2c1dce3543ae 136
louatayehh 0:2c1dce3543ae 137 send[0] = CCS811_REG_ALG_RESULT_DATA;
louatayehh 0:2c1dce3543ae 138 _i2c.write(CCS811_I2C_ADDR, send, 1, true);
louatayehh 0:2c1dce3543ae 139 _i2c.read(CCS811_I2C_ADDR, recv, 8, false);
louatayehh 0:2c1dce3543ae 140 wait_us(1);
louatayehh 0:2c1dce3543ae 141
louatayehh 0:2c1dce3543ae 142 // pc.printf("%X %X\r\n", recv[0], recv[1]);
louatayehh 0:2c1dce3543ae 143 // pc.printf("%X %X\r\n", recv[2], recv[3]);
louatayehh 0:2c1dce3543ae 144 // pc.printf("%X %X\r\n", recv[4], recv[5]);
louatayehh 0:2c1dce3543ae 145 // pc.printf("%X %X\r\n", recv[6], recv[7]);
louatayehh 0:2c1dce3543ae 146
louatayehh 0:2c1dce3543ae 147 *ECO2 = (uint16_t) (recv[0] <<8) + recv[1];
louatayehh 0:2c1dce3543ae 148 *TVOC = (uint16_t) (recv[2] <<8) + recv[3];
louatayehh 0:2c1dce3543ae 149
louatayehh 0:2c1dce3543ae 150 return 0;
louatayehh 0:2c1dce3543ae 151
louatayehh 0:2c1dce3543ae 152 }
louatayehh 0:2c1dce3543ae 153
louatayehh 0:2c1dce3543ae 154
louatayehh 0:2c1dce3543ae 155 //vérifier CCS811 du bus i2c
louatayehh 0:2c1dce3543ae 156
louatayehh 0:2c1dce3543ae 157 bool CCS811::checkHW()
louatayehh 0:2c1dce3543ae 158 {
louatayehh 0:2c1dce3543ae 159 char read[1];
louatayehh 0:2c1dce3543ae 160 char hid[1];
louatayehh 0:2c1dce3543ae 161
louatayehh 0:2c1dce3543ae 162 read[0] = CCS811_REG_HW_ID;
louatayehh 0:2c1dce3543ae 163
louatayehh 0:2c1dce3543ae 164 _i2c.write(CCS811_I2C_ADDR, read, 1, false);
louatayehh 0:2c1dce3543ae 165 _i2c.read(CCS811_I2C_ADDR, hid, 1, false);
louatayehh 0:2c1dce3543ae 166
louatayehh 0:2c1dce3543ae 167 // pc.printf("%X\r\n", hid[0]);
louatayehh 0:2c1dce3543ae 168
louatayehh 0:2c1dce3543ae 169 if (hid[0] == 0x81) {
louatayehh 0:2c1dce3543ae 170 return true;
louatayehh 0:2c1dce3543ae 171 } else {
louatayehh 0:2c1dce3543ae 172 return false;
louatayehh 0:2c1dce3543ae 173 }
louatayehh 0:2c1dce3543ae 174
louatayehh 0:2c1dce3543ae 175 }
louatayehh 0:2c1dce3543ae 176
louatayehh 0:2c1dce3543ae 177
louatayehh 0:2c1dce3543ae 178 bool CCS811::softRest()
louatayehh 0:2c1dce3543ae 179 {
louatayehh 0:2c1dce3543ae 180
louatayehh 0:2c1dce3543ae 181 char rstCMD[5] = {CCS811_REG_SW_RESET, 0x11,0xE5,0x72,0x8A};
louatayehh 0:2c1dce3543ae 182
louatayehh 0:2c1dce3543ae 183 _i2c.write(CCS811_I2C_ADDR, rstCMD, 5);
louatayehh 0:2c1dce3543ae 184
louatayehh 0:2c1dce3543ae 185 return false;
louatayehh 0:2c1dce3543ae 186
louatayehh 0:2c1dce3543ae 187 }