CC2652R7: Send break via UART emulator (Sensor controller)

Hi Madhusdhan,

You could generate the break condition either by using the pin in GPIO mode or by sending a 0x0 value over a slower baudrate (as you suggest in your question).

I tried to modify the UART emulator example from sensor controller studio to do as you suggested and it seems to work on my side.

void taskFxn(UArg a0, UArg a1) {

    // Initialize the Sensor Controller
    scifOsalInit();
    scifOsalRegisterCtrlReadyCallback(scCtrlReadyCallback);
    scifOsalRegisterTaskAlertCallback(scTaskAlertCallback);
    scifInit(&scifDriverSetup);

    // Start the UART emulator
    scifExecuteTasksOnceNbl(BV(SCIF_UART_EMULATOR_TASK_ID));

    // Enable baud rate generation
    // set slow baud rate for break generation
    scifUartSetBaudRate(9600);

    // Enable RX (10 idle bit periods required before enabling start bit detection)
    scifUartSetRxFifoThr(SCIF_UART_RX_FIFO_MAX_COUNT / 2);
    scifUartSetRxTimeout(10 * 2);
    scifUartSetRxEnableReqIdleCount(10 * 2);
    scifUartRxEnable(1);

    // Enable events (half full RX FIFO or 10 bit period timeout
    scifUartSetEventMask(BV_SCIF_UART_ALERT_RX_FIFO_ABOVE_THR | BV_SCIF_UART_ALERT_RX_BYTE_TIMEOUT);

    // ## send break event ##
    scifUartTxPutChar(0);
    scifWaitOnNbl(500);

    // finally set correct baud rate
    scifUartSetBaudRate(57600);
    
    // rest of example unchanged...

and I can observe the break event with a logic analyzer:

How are you using the break condition in your protocol? And what precisely is not working for you?

Regards,

Fausto

Hi,

The baud rate I'm using is 9600. So to generate break, I sent 0 at 4800 baud. I also got framing error like in your case with my logic analyzer.  I want to know if there's any way to simulate a proper break, so that it shows as break in logic analyzer.

Regards,

Madhusudhan