Compiler/LAUNCHXL-CC2640R2: SHT31-D Temperature & Humidity Sensor

Tool/software: TI C/C++ Compiler

Hello, I got the SHT31-D sensor (Humidity & Temperature), I've been working to interface it with the LAUNCHXL-CC2640R2 with no success...

There's a library example for Arduino which works fine. But when trying to port the library to CCS, I simply can't get it working...

The quantity reported by the sensor is always negative (which doesn't make sense).

This is my code:

#define SHT31_SENSOR_ADDR 0x44
#define SHT31_MEAS_HIGHREP 0x2400
#define SHT31_SOFTRESET 0x30A2

void *mainThread(void *arg0)
{
    unsigned int    i;
    float humidity, temp;
    uint8_t         txBuffer[2];
    uint8_t         rxBuffer[6];
    uint16_t        ST, SRH;
    I2C_Handle      i2c;
    I2C_Params      i2cParams;
    I2C_Transaction i2cTransaction;

    /* Call driver init functions */
    Display_init();
    GPIO_init();
    I2C_init();

    /* Configure the LED pin */
    GPIO_setConfig(Board_GPIO_LED0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    /* Open the HOST display for output */
    display = Display_open(Display_Type_UART, NULL);
    if (display == NULL) {
        while (1);
    }

    /* Turn on user LED */
    GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);
    Display_printf(display, 0, 0, "Starting the SHT31-D Sensor (Temp & Humidity)\n");

    /* Create I2C for usage */
    I2C_Params_init(&i2cParams);
    i2cParams.bitRate = I2C_100kHz; //400kHz
    i2c = I2C_open(Board_I2C_TMP, &i2cParams);
    if (i2c == NULL) {
        Display_printf(display, 0, 0, "Error Initializing I2C\n");
        while (1);
        //return false;
    }
    else {
        txBuffer[0]=SHT31_SOFTRESET >>8;
        txBuffer[1]=SHT31_SOFTRESET & 0xFF;
        i2cTransaction.slaveAddress = SHT31_SENSOR_ADDR;
        i2cTransaction.writeCount = sizeof(txBuffer);
        i2cTransaction.writeBuf = txBuffer;
        sleep(0.5);
        Display_printf(display, 0, 0, "I2C Initialized!\n");

        //return true;
    }

    /* Take 20 samples and print them out onto the console */
    for (i = 0; i< 20; i++){
        txBuffer[0] = SHT31_MEAS_HIGHREP >> 8; //0x2400
        txBuffer[1] = SHT31_MEAS_HIGHREP & 0xFF;
        i2cTransaction.slaveAddress = SHT31_SENSOR_ADDR;
        i2cTransaction.writeCount = sizeof(txBuffer);
        i2cTransaction.writeBuf = txBuffer;    //Wire.write(SHT31_MEAS_HIGHREP >> 8);
        i2cTransaction.readCount = sizeof(rxBuffer);
        i2cTransaction.readBuf = rxBuffer;
        sleep(0.5);
        if(I2C_transfer(i2c, &i2cTransaction)){
             ST = rxBuffer[0];
             ST <<= 8;
             ST |= rxBuffer[1];
             if (rxBuffer[2] != crc8(rxBuffer, 2)) i=20; //return false;

             SRH = rxBuffer[3];
             SRH <<= 8;
             SRH |= rxBuffer[4];
             if (rxBuffer[5] != crc8(rxBuffer+3, 2)) i=20;//return false;

             double stemp = ST;
             stemp *= 175;
             stemp /= 0xffff;
             stemp = -45 + stemp;
             Display_printf(display, 0, 0, "Temperature %u *C = %d \n", i, stemp);

             double shum = SRH;
             shum *= 100;
             shum /= 0xFFFF;
             Display_printf(display, 1, 0, "Humidity %u %%RH = %d \n", i, shum);
        }
        else {
            Display_printf(display, 0, 0, "I2C Bus fault\n");
        }
        /* Sleep for 1 second */
        sleep(1);
    }

    /* Deinitialized I2C */
    I2C_close(i2c);
    Display_printf(display, 0, 0, "I2C closed!\n");

    return (NULL);
}

The sensor-board connections:

SCL = DIO04

SDA = DIO05

Thanks for the help!