File content as of revision 0:b5dbfc21185d:

#include "CCS811.h"

CCS811::CCS811(I2C& i2c) : m_i2c(i2c), pc(p5, p4) {
    
}

/**
 ** Initial CCS811 need write MODE register and should Write APP START register to begin measurement.
 **/
void CCS811::init() {
    char send[2];
    
    if (!checkHW()) {
        return;
    }else {
        pc.printf("CCS811 is confirm!\r\n");    
    }
    
    send[0] = CCS811_REG_MEAS_MODE;
    send[1] = CCS811_MEASUREMENT_MODE1;
    
    m_i2c.write(CCS811_I2C_ADDR, send, 2);
    
    send[0] = CCS811_REG_APP_START;
    send[1] = 0x00;
    
    m_i2c.write(CCS811_I2C_ADDR, send, 2);
    
}

int CCS811::setMeasureMode(char mode) {
    
    char send[2];
    
    send[0] = CCS811_MEASUREMENT_MODE1;
    send[1] = mode;
    
    m_i2c.write(CCS811_I2C_ADDR, send, 2);
    
    send[0] = CCS811_REG_APP_START;
    send[1] = 0x00;
    
    m_i2c.write(CCS811_I2C_ADDR, send, 2);
    
    return 0;
}

/**
 ** Here is that you can read CCS811 with co2 ppm and tvoc bbm is unsigned value
 **/
int CCS811::readData(uint16_t *ECO2, uint16_t *TVOC) {
    
    char recv[8];
    
    
    
    recv[0] = CCS811_REG_ALG_RESULT_DATA;
    m_i2c.write(CCS811_I2C_ADDR, recv, 1);
    m_i2c.read( CCS811_I2C_ADDR, recv, 8);

//    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;
    
}

/**
 ** Here for check is CCS811 hardware from i2c bus
 **/
bool CCS811::checkHW() {

    char read[1];
    char hid[1];
    
    read[0] = CCS811_REG_HW_ID;
    
    m_i2c.write(CCS811_I2C_ADDR, read, 1, false);
    m_i2c.read(CCS811_I2C_ADDR, hid, 1, false);
    
//    pc.printf("%X\r\n", hid[0]);
    
    if (hid[0] == 0x81) {
        return true;
    } else {
        return false;
    }
    
}

/**
 **  Here is provide you soft reset CCS811 module 
 **/
bool CCS811::softRest() {
     
    char rstCMD[5] = {CCS811_REG_SW_RESET, 0x11,0xE5,0x72,0x8A};

    m_i2c.write(CCS811_I2C_ADDR, rstCMD, 5);
    
    return false;
      
}