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C5515 UART with Autoflow control (CTS/RTS) with DMA Receive channel not working

Sasha Kalmanovich
Intellectual 840 points

I have a working project that works with the UART in DMA mode (both Tx and Rx channels) without flow control.

When I have added the flow control to the uart (CSL_UART_AFE, CSL_UART_RTS options) , the Rx channel stopped generating DMA events (The Tx channel works fine).

I can see that the data arrives ok because I can read it from the uart FIFO. But no dma event is generated.

In conclusion the only change made is enablign the AFE, and after I made it, the DMA Rx channel stopped working.

Any ideas ?

Thanks.

 

My uart setup is :

const CSL_UartSetup uartSetup =
{
    /* Input clock freq in MHz */
    DSP_SYSTEM_CLOCK_MHZ*1000L*1000L,
    /* Baud rate */    
    230400,
    /* 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_ENABLE_TRIG14,
    /* Loop Back enable */
    CSL_UART_NO_LOOPBACK,
    #ifdef AUX_UART_FLOW_CONTROL_ENABLED
    /* No auto flow control*/
    CSL_UART_AFE
    /* No RTS */
    CSL_UART_RTS
    #endif
    #ifndef AUX_UART_FLOW_CONTROL_ENABLED
    /* No auto flow control*/
    CSL_UART_NO_AFE ,
    /* No RTS */
    CSL_UART_NO_RTS
    #endif
};