CC1310: DMA UART

Hi Boris, 

Thanks for question.

I'll look into this and get back to you as fast as possible. 

Thanks, 
Elin

Hi Elin.

Is there some news?

We are seriously stuck without a solution.

IAdd another pies of code that how we enabling UART.

void uart_init(void)
{
    UART_init();

    {// initialize uart
        UART_Params uartParams;
        UART_Params_init(&uartParams);
        uartParams.readMode = UART_MODE_CALLBACK;           // Non-blocking and will return immediately. When UART_write() or
                                                            // UART_read() has finished, the callback function is called from either
                                                            // the caller's context or from an interrupt context.
        uartParams.readCallback = Rx_UART_Callback;
        uartParams.readTimeout = 1;                         // UART_Params.readTimeout is not in use when using UART_MODE_CALLBACK mode.

        uartParams.readDataMode = UART_DATA_BINARY;
        uartParams.readReturnMode = UART_RETURN_FULL;       // Unblock/callback when buffer is full.
        uartParams.readEcho = UART_ECHO_OFF;

        uartParams.writeMode = UART_MODE_CALLBACK;          // Non-blocking and will return immediately. When UART_write() or
                                                            // UART_read() has finished, the callback function is called from either
                                                            // the caller's context or from an interrupt context.
        uartParams.writeCallback = Tx_UART_Callback;
        uartParams.writeTimeout = 1;

        uartParams.writeDataMode = UART_DATA_BINARY;
        uartParams.baudRate = 19200;

        uart_Handle = UART_open(Board_UART0, &uartParams);

        if (uart_Handle == null)
            GenError("019");
    }// initialize uart

    UART_control(uart_Handle, UARTCC26XX_CMD_RETURN_PARTIAL_ENABLE, NULL);

    UARTFIFODisable(UART0_BASE);                // 0x40001000

UARTDMAEnable(UART0_BASE, UART_DMA_TX);                 // uart dma enable for transmit

    stWre_Status.Flags.UartRead = 1;
    UART_read(uart_Handle, Rx_UART_Buf, 1);
}

Regard

Boris

Hi Boris, 

Thanks for the update. 

It's difficult to comment on what can be missing or incorrect in the code without knowing what problem you are seeing on your end. Can you describe the issue you are experiencing? 

Thanks, 
Elin 

Hi Elin

Generally, we try to communicate via UART when receiving direction handled by Rx interrupts, rather transmit imposed to be done through the UART DMA since the decision to transmit and transmit start done inside RX interrupt.
This will reduce the impact on CPU and time that the interrupts steal from RTOS.

The code of uDMA and UART handling already been sent to you.
So when function void uDma_startTransfer(void);  is invoked I expect to see UART starts to transfer data. This doesn't happen.
My feeling that I misunderstood somewhat in EventRegister(..)

Please your help

Hi Marie

Thanks for the answer. 

Of course, I looked in the TRM. 

Again, I got no problem with memory to memory transfer. And as I assume that means that the control table and the appropriate control table entry are defined correctly. 

In addition, when I set up the uDMA channel for the UART transfer, using the uDMAChannelControlSet(), the desired table entry in the case of UART it UDMA_CHAN_UART0_TX, which is 2,

receives correct values (I browse it via debugger).

The head of the thread includes two functions that initiate the transfer: void uDma_init(void) and void uDma_startTransfer(void) both, of them about twelve lines. Could you please indicate what is wrong with these functions? Or, alternatively, send a sample code that works.

However, if you insist on using ALLOCATE_CONTROL_TABLE_ENTRY(ENTRY_NAME, CHANNEL_INDEX)

please point where can I find the definitions for the ENTRY_NAME.  As I understand, CHANNEL_INDEX in my case is UDMA_CHAN_UART0_TX. Is it correct?

Thanks for your cooperation.

Hi, 

This question is being resolved over email. 

Thanks, 
Elin 

Hi Elin.

Unfortunately, I've got from You by email only '.h' file which describes structures that suppose to support UART uDMA.

But there are no '.c' files. 

Regards 

Boris

Hi Boris, 

Unfortunately, the .h file is the only one that's available for this kind of example. 

Thanks, 
Elin