SPI sample

Hi

I want to build a SPI sample based on uartEach sample that two CC1310 devices talk each other.

My code is below. Open the SPI with Master/Slave mode according to UART input. I don't know why every SPI_transfer will return FALSE, and the second SPI_transfer will not block for recieving.

#define SPI_TRANSFER_SLAVE_STRING "hello, SPI Slave..."
#define SPI_TRANSFER_MASTER_STRING "hello, SPI Master..."
Void echoFxn(UArg arg0, UArg arg1)
{
    uint8_t isTx;
    char input, output;
    UART_Handle uart;
    UART_Params uartParams;
    SPI_Handle spi;
    SPI_Params spiParams;
    SPI_Transaction spTrans;
    char buffer[128] = "\fSPI Sample:\r\n";

    /* Create a UART with data processing off. */
    UART_Params_init(&uartParams);
    uartParams.writeDataMode = UART_DATA_BINARY;
    uartParams.readDataMode = UART_DATA_BINARY;
    uartParams.readReturnMode = UART_RETURN_FULL;
    uartParams.readEcho = UART_ECHO_OFF;
    uartParams.baudRate = 9600;
    uart = UART_open(Board_UART0, &uartParams);
    
    SPI_Params_init(&spiParams);
    spiParams.bitRate           = 1000000;                     /*!< SPI bit rate in Hz */
    spiParams.frameFormat = SPI_POL1_PHA1;

    if (uart == NULL) {
        System_abort("Error opening the UART");
    }
    
    UART_write(uart, buffer, strlen(buffer));
    UART_read(uart, &input, 1);
    
    memset(&spTrans, 0, sizeof(SPI_Transaction));

    if ('1' == input) {
      spiParams.mode              = SPI_MASTER;                    /*!< Master or Slave mode */
      strcpy(buffer, "SPI open with Master mode");
      isTx = FALSE;
    } else {
      spiParams.mode              = SPI_SLAVE;                    /*!< Master or Slave mode */
      isTx = TRUE;
      strcpy(buffer, "SPI open with Slave mode");
    }
    UART_write(uart, buffer, strlen(buffer));
    
    spi = SPI_open(Board_SPI0, &spiParams);
    if (spi == NULL) {
      System_abort("Error opening the UART");
    }

    /* Loop forever echoing */
    while (1) {
      if (SPI_MASTER == spiParams.mode) {
        spTrans.count = strlen (SPI_TRANSFER_SLAVE_STRING);
        spTrans.txBuf = SPI_TRANSFER_SLAVE_STRING;
        spTrans.rxBuf = NULL;        
        SPI_transfer(spi, &spTrans);
      } else {
        spTrans.count = strlen (SPI_TRANSFER_SLAVE_STRING);
        spTrans.txBuf = NULL;
        spTrans.rxBuf = buffer;
        SPI_transfer(spi, &spTrans);
      }
    }
}