TIDC-CC2650STK-SENSORTAG: SPI Interface (devPack TIDA-00650, ADS1220) with Z-Stack_Home_1.2.2a - Reading from thermocouple sensor

Hi,

I'm trying to work with the SPI interface, in particular I'm trying to configure the ADC (ADC1220) of the TIDA-00650 board (http://www.ti.com/tool/TIDA-00650).

The ADC only supports the mode: SPI MODE1 (CPOL = 0, CPHA = 1, data transmitted on the rising edge and sampled on the falling edge).

Using the SPI library in Z-Stack_Home_1.2.2a...I am trying to communicate with the ADC, but something is wrong!!!

Initializing the SPI interface with bspSpiOpen() with these parameters:

/*******************************************************************************
 * @fn          bspSpiOpen
 *
 * @brief       Open the RTOS SPI driver
 *
 * @param       none
 *
 * @return      none
 */
void bspSpiOpen(void)
{
  if (spiHandle == NULL)
  {
    //SPI_init(); // adds
    /*  Configure SPI as master, 4 mHz bit rate*/
    SPI_Params_init(&spiParams);
    spiParams.bitRate = 500000;                                                               // Default: 4000000;
    spiParams.mode         = SPI_MASTER;
    spiParams.transferMode = SPI_MODE_BLOCKING;
    spiParams.frameFormat = SPI_POL0_PHA1;                                      // Default: SPI_POL0_PHA0

    /* Attempt to open SPI. */
    spiHandle = SPI_open(Board_SPI0, &spiParams);

    if (spiHandle == NULL)
    {
      Task_exit();
    }
  }
}

and the following PIN configuration (Board.c, in C:\ti\tirtos_simplelink_2_11_01_09\packages\ti\boards\SensorTag\CC26XXST_0120\Board.c):

#if defined(TIDA_00650)
// PIN table for the SPI
static PIN_Config TIDA00650_PinTable[] =
{
  // SPI Interface
  Board_DP0 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,/* DevPack : TIDA-00650 | LED (green) --> OFF */
  Board_DP3 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,/* DevPack : TIDA-00650 | PWR_UP_CHIP --> LOW */
  Board_DP1 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MIN,/* DevPack : TIDA-00650 | nCS_ADC     --> LOW */
  Board_DP2 | PIN_INPUT_EN | PIN_PULLUP | PIN_IRQ_BOTHEDGES | PIN_HYSTERESIS,   /* DevPack : TIDA-00650 | nDRDY_ADC   --> LOW */
  PIN_TERMINATE /* Terminate list */
};

I can't communicate (COMMAND BYTE di ADS1220) with ADC.

Instead if I use a lower bitrate (spiParams.bitrate = 5000) YES: I can write the ADC registers (WREG), I can start the temperature measurement conversion (START / SYNC), but ...

... in reading the data (RDATA) I get values but they are incorrect.

Note. I tried to read from a test card (with ARDUINO) and read the thermocouple temperature correctly.

What am I doing wrong?

thanks to everyone!