Lourdès Abou-tayeh / CCS811

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Dependents:   Capteur2

CCS811.cpp@1:d0abe05bc21e, 2021-09-06 (annotated)

Committer:
louatayehh
Date:
Mon Sep 06 11:32:22 2021 +0000
Revision:
1:d0abe05bc21e
Parent:
0:2c1dce3543ae 
Capteur 2 : CSS811;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
louatayehh 1:d0abe05bc21e 1 //*****************Capteur CCS811 - qualité de l'air ***************************//
louatayehh 1:d0abe05bc21e 2
louatayehh 0:2c1dce3543ae 3 #include "CCS811.h"
louatayehh 0:2c1dce3543ae 4
louatayehh 1:d0abe05bc21e 5 CCS811::CCS811(PinName sda, PinName scl) : _i2c(sda, scl) {} // Constructeur
louatayehh 0:2c1dce3543ae 6
louatayehh 0:2c1dce3543ae 7 /**
louatayehh 0:2c1dce3543ae 8 ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement.
louatayehh 0:2c1dce3543ae 9 **/
louatayehh 0:2c1dce3543ae 10
louatayehh 0:2c1dce3543ae 11 void CCS811::init()
louatayehh 0:2c1dce3543ae 12 {
louatayehh 0:2c1dce3543ae 13 wait_us(50);
louatayehh 0:2c1dce3543ae 14
louatayehh 0:2c1dce3543ae 15 char send[2];
louatayehh 0:2c1dce3543ae 16 char read[8];
louatayehh 0:2c1dce3543ae 17 char hwv[8];
louatayehh 0:2c1dce3543ae 18 char hwd[8];
louatayehh 0:2c1dce3543ae 19
louatayehh 0:2c1dce3543ae 20 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 21
louatayehh 0:2c1dce3543ae 22 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 23 _i2c.read(CCS811_I2C_ADDR, hwv, 1);
louatayehh 0:2c1dce3543ae 24
louatayehh 0:2c1dce3543ae 25 wait_us(50);
louatayehh 0:2c1dce3543ae 26
louatayehh 0:2c1dce3543ae 27 send[0] = CCS811_REG_APP_START; //0xF4
louatayehh 0:2c1dce3543ae 28
louatayehh 0:2c1dce3543ae 29 wait_us(50);
louatayehh 0:2c1dce3543ae 30
louatayehh 0:2c1dce3543ae 31 _i2c.write(CCS811_I2C_ADDR, send, 1);
louatayehh 0:2c1dce3543ae 32
louatayehh 0:2c1dce3543ae 33 wait_us(50);
louatayehh 0:2c1dce3543ae 34
louatayehh 0:2c1dce3543ae 35 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 36
louatayehh 0:2c1dce3543ae 37 wait_us(50);
louatayehh 0:2c1dce3543ae 38
louatayehh 0:2c1dce3543ae 39 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 40 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 41
louatayehh 0:2c1dce3543ae 42 wait_us(50);
louatayehh 0:2c1dce3543ae 43
louatayehh 0:2c1dce3543ae 44
louatayehh 0:2c1dce3543ae 45 send[0] = CCS811_REG_MEAS_MODE; //0x01
louatayehh 0:2c1dce3543ae 46 send[1] = CCS811_MEASUREMENT_MODE1; //0x10
louatayehh 0:2c1dce3543ae 47
louatayehh 0:2c1dce3543ae 48 _i2c.write(CCS811_I2C_ADDR, send, 2);
louatayehh 0:2c1dce3543ae 49 wait_us(50);
louatayehh 0:2c1dce3543ae 50
louatayehh 0:2c1dce3543ae 51 wait_us(50);
louatayehh 0:2c1dce3543ae 52
louatayehh 0:2c1dce3543ae 53
louatayehh 0:2c1dce3543ae 54 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 55
louatayehh 0:2c1dce3543ae 56 wait_us(50);
louatayehh 0:2c1dce3543ae 57
louatayehh 0:2c1dce3543ae 58
louatayehh 0:2c1dce3543ae 59 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 60 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 61
louatayehh 0:2c1dce3543ae 62 wait_us(50);
louatayehh 0:2c1dce3543ae 63 }
louatayehh 0:2c1dce3543ae 64
louatayehh 0:2c1dce3543ae 65 int CCS811::setMeasureMode(char mode)
louatayehh 0:2c1dce3543ae 66 {
louatayehh 0:2c1dce3543ae 67
louatayehh 0:2c1dce3543ae 68 char send[2];
louatayehh 0:2c1dce3543ae 69
louatayehh 0:2c1dce3543ae 70 send[0] = CCS811_REG_MEAS_MODE;
louatayehh 0:2c1dce3543ae 71 send[1] = mode;
louatayehh 0:2c1dce3543ae 72
louatayehh 0:2c1dce3543ae 73 _i2c.write(CCS811_I2C_ADDR, send, 2);
louatayehh 0:2c1dce3543ae 74
louatayehh 0:2c1dce3543ae 75 // send[0] = CCS811_REG_APP_START;
louatayehh 0:2c1dce3543ae 76 // send[1] = 0x00;
louatayehh 0:2c1dce3543ae 77
louatayehh 0:2c1dce3543ae 78 // _i2c.write(CCS811_I2C_ADDR, send, 2);
louatayehh 0:2c1dce3543ae 79
louatayehh 0:2c1dce3543ae 80 return 0;
louatayehh 0:2c1dce3543ae 81 }
louatayehh 0:2c1dce3543ae 82
louatayehh 0:2c1dce3543ae 83 bool CCS811::readstatus()
louatayehh 0:2c1dce3543ae 84 {
louatayehh 0:2c1dce3543ae 85
louatayehh 0:2c1dce3543ae 86 char read[8];
louatayehh 0:2c1dce3543ae 87 char hwd[8];
louatayehh 0:2c1dce3543ae 88
louatayehh 0:2c1dce3543ae 89 read[0] = CCS811_REG_STATUS; //0x00
louatayehh 0:2c1dce3543ae 90
louatayehh 0:2c1dce3543ae 91 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 92 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 93
louatayehh 0:2c1dce3543ae 94 printf("STATUS 0x%X\r\n", hwd[0]);
louatayehh 0:2c1dce3543ae 95
louatayehh 0:2c1dce3543ae 96 return 0;
louatayehh 0:2c1dce3543ae 97 }
louatayehh 0:2c1dce3543ae 98
louatayehh 0:2c1dce3543ae 99 bool CCS811::readmeas()
louatayehh 0:2c1dce3543ae 100 {
louatayehh 0:2c1dce3543ae 101
louatayehh 0:2c1dce3543ae 102 char read[8];
louatayehh 0:2c1dce3543ae 103 char hwd[8];
louatayehh 0:2c1dce3543ae 104
louatayehh 0:2c1dce3543ae 105 read[0] = CCS811_REG_MEAS_MODE; //0x01
louatayehh 0:2c1dce3543ae 106
louatayehh 0:2c1dce3543ae 107 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 108 _i2c.read(CCS811_I2C_ADDR, hwd, 1);
louatayehh 0:2c1dce3543ae 109
louatayehh 0:2c1dce3543ae 110 printf("meas 0x%X\r\n", hwd[0]);
louatayehh 0:2c1dce3543ae 111
louatayehh 0:2c1dce3543ae 112 return 0;
louatayehh 0:2c1dce3543ae 113 }
louatayehh 0:2c1dce3543ae 114
louatayehh 0:2c1dce3543ae 115 bool CCS811::readerror()
louatayehh 0:2c1dce3543ae 116 {
louatayehh 0:2c1dce3543ae 117
louatayehh 0:2c1dce3543ae 118 char read[8];
louatayehh 0:2c1dce3543ae 119 char hwv[8];
louatayehh 0:2c1dce3543ae 120
louatayehh 0:2c1dce3543ae 121 read[0] = CCS811_REG_ERROR_ID; //0xE0
louatayehh 0:2c1dce3543ae 122
louatayehh 0:2c1dce3543ae 123 _i2c.write(CCS811_I2C_ADDR, read, 1);
louatayehh 0:2c1dce3543ae 124 _i2c.read(CCS811_I2C_ADDR, hwv, 1);
louatayehh 0:2c1dce3543ae 125
louatayehh 0:2c1dce3543ae 126 printf("error 0x%X \r\n", hwv[0]);
louatayehh 0:2c1dce3543ae 127
louatayehh 0:2c1dce3543ae 128 return 0;
louatayehh 0:2c1dce3543ae 129 }
louatayehh 0:2c1dce3543ae 130
louatayehh 0:2c1dce3543ae 131 //Lecture de CCS811 : taux de CO2 en ppm et taux de tvos en bbm (unsigned)
louatayehh 0:2c1dce3543ae 132
louatayehh 0:2c1dce3543ae 133 int CCS811::readData(uint16_t *ECO2, uint16_t *TVOC)
louatayehh 0:2c1dce3543ae 134 {
louatayehh 0:2c1dce3543ae 135 char recv[8];
louatayehh 0:2c1dce3543ae 136 char send[1];
louatayehh 0:2c1dce3543ae 137
louatayehh 0:2c1dce3543ae 138 send[0] = CCS811_REG_ALG_RESULT_DATA;
louatayehh 0:2c1dce3543ae 139 _i2c.write(CCS811_I2C_ADDR, send, 1, true);
louatayehh 0:2c1dce3543ae 140 _i2c.read(CCS811_I2C_ADDR, recv, 8, false);
louatayehh 0:2c1dce3543ae 141 wait_us(1);
louatayehh 0:2c1dce3543ae 142
louatayehh 0:2c1dce3543ae 143 // pc.printf("%X %X\r\n", recv[0], recv[1]);
louatayehh 0:2c1dce3543ae 144 // pc.printf("%X %X\r\n", recv[2], recv[3]);
louatayehh 0:2c1dce3543ae 145 // pc.printf("%X %X\r\n", recv[4], recv[5]);
louatayehh 0:2c1dce3543ae 146 // pc.printf("%X %X\r\n", recv[6], recv[7]);
louatayehh 0:2c1dce3543ae 147
louatayehh 0:2c1dce3543ae 148 *ECO2 = (uint16_t) (recv[0] <<8) + recv[1];
louatayehh 0:2c1dce3543ae 149 *TVOC = (uint16_t) (recv[2] <<8) + recv[3];
louatayehh 0:2c1dce3543ae 150
louatayehh 0:2c1dce3543ae 151 return 0;
louatayehh 0:2c1dce3543ae 152
louatayehh 0:2c1dce3543ae 153 }
louatayehh 0:2c1dce3543ae 154
louatayehh 0:2c1dce3543ae 155
louatayehh 0:2c1dce3543ae 156 //vérifier CCS811 du bus i2c
louatayehh 0:2c1dce3543ae 157
louatayehh 0:2c1dce3543ae 158 bool CCS811::checkHW()
louatayehh 0:2c1dce3543ae 159 {
louatayehh 0:2c1dce3543ae 160 char read[1];
louatayehh 0:2c1dce3543ae 161 char hid[1];
louatayehh 0:2c1dce3543ae 162
louatayehh 0:2c1dce3543ae 163 read[0] = CCS811_REG_HW_ID;
louatayehh 0:2c1dce3543ae 164
louatayehh 0:2c1dce3543ae 165 _i2c.write(CCS811_I2C_ADDR, read, 1, false);
louatayehh 0:2c1dce3543ae 166 _i2c.read(CCS811_I2C_ADDR, hid, 1, false);
louatayehh 0:2c1dce3543ae 167
louatayehh 0:2c1dce3543ae 168 // pc.printf("%X\r\n", hid[0]);
louatayehh 0:2c1dce3543ae 169
louatayehh 0:2c1dce3543ae 170 if (hid[0] == 0x81) {
louatayehh 0:2c1dce3543ae 171 return true;
louatayehh 0:2c1dce3543ae 172 } else {
louatayehh 0:2c1dce3543ae 173 return false;
louatayehh 0:2c1dce3543ae 174 }
louatayehh 0:2c1dce3543ae 175
louatayehh 0:2c1dce3543ae 176 }
louatayehh 0:2c1dce3543ae 177
louatayehh 0:2c1dce3543ae 178
louatayehh 0:2c1dce3543ae 179 bool CCS811::softRest()
louatayehh 0:2c1dce3543ae 180 {
louatayehh 0:2c1dce3543ae 181
louatayehh 0:2c1dce3543ae 182 char rstCMD[5] = {CCS811_REG_SW_RESET, 0x11,0xE5,0x72,0x8A};
louatayehh 0:2c1dce3543ae 183
louatayehh 0:2c1dce3543ae 184 _i2c.write(CCS811_I2C_ADDR, rstCMD, 5);
louatayehh 0:2c1dce3543ae 185
louatayehh 0:2c1dce3543ae 186 return false;
louatayehh 0:2c1dce3543ae 187
louatayehh 0:2c1dce3543ae 188 }