TMS320C5505 UART Transmission

Hello,

I am observing is that there is no activity on the Tx line even though the code is writing data to the THR register. Also the code monitors bit 6 of the LSR register to ensure that both the Tx FIFO and the Tx shift register are empty. The Tx line remains at 3.3V.

Which is the solution?

CSL_UartSetup mySetup =
{

// Input clock freq in MHz
    100000000,
    // Baud rate
    38400,
    // Word length of 8
    CSL_UART_WORD8,
    // To generate 1 stop bit
    0,
    // Disable the parity
    CSL_UART_DISABLE_PARITY,
    // Enable trigger 14 fifo
    CSL_UART_FIFO_DMA1_DISABLE_TRIG14,
    // Loop Back enable
    CSL_UART_NO_LOOPBACK,
    // No auto flow control
    CSL_UART_NO_AFE ,
    // No RTS
    CSL_UART_NO_RTS ,

};

void Init_Uart(void)
{
    CSL_UartIsrAddr    isrAddr;
    CSL_Status         status;
    Uint32             sysClk;

sysClk = getSysClk();

    mySetup.clkInput = sysClk;

    // Loop counter and error flag
    status = UART_init(&uartObj,CSL_UART_INST_0,UART_INTERRUPT);
    if(CSL_SOK != status)
    {
        printf("UART_init failed error code %d\n",status);
        return;
    }
    else
    {
        printf("UART_init Successful\n");
    }

    // Handle created
    hUart = (CSL_UartHandle)(&uartObj);

    // Configure UART registers using setup structure
    status = UART_setup(hUart,&mySetup);
    if(CSL_SOK != status)
    {
        printf("UART_setup failed error code %d\n",status);
        return;
    }
    else
    {
        printf("UART_setup Successful\n");
    }

    // Configure and Register the UART interrupts
   
    isrAddr.tbeiAddr = uart_txIsr;
   

// Configuring Interrupt
    IRQ_plug (UART_EVENT, &UART_intrDispatch);



    Buff_tx_uart[0] = 'L';
    Buff_tx_uart[1] = 0xAA;


    // Enabling Interrupt
    IRQ_enable(UART_EVENT);


    // Set the UART callback function
     status = UART_setCallback(hUart,&isrAddr);
    if(status != CSL_SOK)
    {
        printf("UART_setCallback Failed\n");
    }

}

void uart_txIsr(void)
{

status = UART_eventDisable(hUart, CSL_UART_XMITOR_REG_EMPTY_INTERRUPT);

}

interrupt void UART_intrDispatch(void)
{
    Uint16 eventId = 0;

    IRQ_disable(UART_EVENT);

    /* Get the event Id which caused interrupt */
   
   
  eventId = UART_getEventId(hUart);


    return;
}

void main()

{

       status = UART_eventEnable(hUart, CSL_UART_XMITOR_REG_EMPTY_INTERRUPT);

        UART_write( hUart,Buff_tx_uart,2,0);

}