File content as of revision 1:d0abe05bc21e:

//*****************Capteur CCS811 - qualité de l'air ***************************//

#include "CCS811.h"

CCS811::CCS811(PinName sda, PinName scl) : _i2c(sda, scl) {} // Constructeur

/**
 ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement.
 **/

void CCS811::init()
{
    wait_us(50);

    char send[2];
    char read[8];
    char hwv[8];
    char hwd[8];

    read[0] = CCS811_REG_STATUS; //0x00

    _i2c.write(CCS811_I2C_ADDR, read, 1);
    _i2c.read(CCS811_I2C_ADDR, hwv, 1);

    wait_us(50);

    send[0] = CCS811_REG_APP_START; //0xF4

    wait_us(50);

    _i2c.write(CCS811_I2C_ADDR, send, 1);

    wait_us(50);

    read[0] = CCS811_REG_STATUS; //0x00

    wait_us(50);

    _i2c.write(CCS811_I2C_ADDR, read, 1);
    _i2c.read(CCS811_I2C_ADDR, hwd, 1);

    wait_us(50);


    send[0] = CCS811_REG_MEAS_MODE; //0x01
    send[1] = CCS811_MEASUREMENT_MODE1; //0x10

    _i2c.write(CCS811_I2C_ADDR, send, 2);
    wait_us(50);

    wait_us(50);


    read[0] = CCS811_REG_STATUS; //0x00

    wait_us(50);


    _i2c.write(CCS811_I2C_ADDR, read, 1);
    _i2c.read(CCS811_I2C_ADDR, hwd, 1);

    wait_us(50);
}

int CCS811::setMeasureMode(char mode)
{

    char send[2];

    send[0] = CCS811_REG_MEAS_MODE;
    send[1] = mode;

    _i2c.write(CCS811_I2C_ADDR, send, 2);

//  send[0] = CCS811_REG_APP_START;
//  send[1] = 0x00;

//  _i2c.write(CCS811_I2C_ADDR, send, 2);

    return 0;
}

bool CCS811::readstatus()
{

    char read[8];
    char hwd[8];

    read[0] = CCS811_REG_STATUS; //0x00

    _i2c.write(CCS811_I2C_ADDR, read, 1);
    _i2c.read(CCS811_I2C_ADDR, hwd, 1);

    printf("STATUS 0x%X\r\n", hwd[0]);

    return 0;
}

bool CCS811::readmeas()
{

    char read[8];
    char hwd[8];

    read[0] = CCS811_REG_MEAS_MODE; //0x01

    _i2c.write(CCS811_I2C_ADDR, read, 1);
    _i2c.read(CCS811_I2C_ADDR, hwd, 1);

    printf("meas 0x%X\r\n", hwd[0]);

    return 0;
}

bool CCS811::readerror()
{

    char read[8];
    char hwv[8];

    read[0] = CCS811_REG_ERROR_ID; //0xE0

    _i2c.write(CCS811_I2C_ADDR, read, 1);
    _i2c.read(CCS811_I2C_ADDR, hwv, 1);

    printf("error 0x%X \r\n", hwv[0]);

    return 0;
}

//Lecture de CCS811 : taux de CO2 en ppm et taux de tvos en bbm (unsigned)

int CCS811::readData(uint16_t *ECO2, uint16_t *TVOC)
{
    char recv[8];
    char send[1];

    send[0] = CCS811_REG_ALG_RESULT_DATA;
    _i2c.write(CCS811_I2C_ADDR, send, 1, true);
    _i2c.read(CCS811_I2C_ADDR, recv, 8, false);
    wait_us(1);

//    pc.printf("%X %X\r\n", recv[0], recv[1]);
//    pc.printf("%X %X\r\n", recv[2], recv[3]);
//    pc.printf("%X %X\r\n", recv[4], recv[5]);
//    pc.printf("%X %X\r\n", recv[6], recv[7]);

    *ECO2 = (uint16_t) (recv[0] <<8) + recv[1];
    *TVOC = (uint16_t) (recv[2] <<8) + recv[3];

    return 0;

}


//vérifier CCS811 du bus i2c

bool CCS811::checkHW()
{
    char read[1];
    char hid[1];

    read[0] = CCS811_REG_HW_ID;

    _i2c.write(CCS811_I2C_ADDR, read, 1, false);
    _i2c.read(CCS811_I2C_ADDR, hid, 1, false);

//    pc.printf("%X\r\n", hid[0]);

    if (hid[0] == 0x81) {
        return true;
    } else {
        return false;
    }

}


bool CCS811::softRest()
{

    char rstCMD[5] = {CCS811_REG_SW_RESET, 0x11,0xE5,0x72,0x8A};

    _i2c.write(CCS811_I2C_ADDR, rstCMD, 5);

    return false;

}