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Interrupt problem after baudrate change !

Metin KOC
Intellectual 610 points
Other Parts Discussed in Thread: TM4C123GH6PM

Hi Everyone;

I am using TM4C123GH6PM. When i change uart baudrate on the fly, Interrupt is stopping.

First of all , i set  UART6 baudrate to 300, then a few time later i  set baudrate to 9600. Transmit is still working but receive interrupt stopping.

Why ?

  • 0
    Guru 20670 points

    Hi Metin,

    Could you please post your code? Can you also check if the raw interrupt is being set? What interrupt do you want?

    Note that:

    "The UART must be disabled (see the UARTEN bit in the UARTCTL register on page 919) before any
    of the control registers are reprogrammed."

    So you might be causing some kind of error. 

  • 0 in reply to Luis Afonso
    Intellectual 610 points

    Hi Luis,

    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART6);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
    GPIOPinConfigure(GPIO_PD4_U6RX);
    GPIOPinConfigure(GPIO_PD5_U6TX);
    GPIOPinTypeUART(GPIO_PORTD_BASE, GPIO_PIN_4|GPIO_PIN_5);
    UARTDisable(UART6_BASE);
    UARTClockSourceSet(UART6_BASE, UART_CLOCK_PIOSC);
    UARTConfigSetExpClk(UART6_BASE, 16000000, 300, (UART_CONFIG_WLEN_7 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_EVEN));
    UARTIntEnable(UART6_BASE, UART_INT_RX | UART_INT_RT);
    IntEnable(INT_UART6);
    UARTEnable(UART6_BASE);

    //A few times later
    UARTConfigSetExpClk(UART6_BASE, 16000000, 9600, (UART_CONFIG_WLEN_7 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_EVEN));

  • 0 in reply to Metin KOC
    TI__Guru**** 244400 points

    Hello Metin

    Luis is correct. The data sheet for UART "strictly" prohibits this kind of on the fly change. What you are seeing is expected.

    Regards

    Amit