Kinetis SDK UART Driver (MQX)

_ZZ_ — Thu, 14 Sep 2017 10:36:59 GMT

Hi everybody

I used to use this set of drivers (UART drivers) for my application and it was working fine. basically, it was working very nice off the shelf. however, I have been running into trouble recently. the UART_DRV_SendDataBlocking() function after transmitting the data it wont return. I debug the the code and realised that the code will mess up where it calls the OSA_SemaPost(&uartState->txIrqSync);

which is done inside the interrupt service routine. I am not sure how this semaphore posting is done behind sense but all I realised is that somewhere a long line the software goes into idle task and runs there for ever. basically semaphorePost function never returns anything.

the code is very simple as following:

----------------------------------------------------------

uart_state_t uartStatee;

uart_user_config_t uartConfigg = {
.bitCountPerChar = kUart8BitsPerChar,
.parityMode = kUartParityDisabled,
.stopBitCount = kUartOneStopBit,
.baudRate = 9600
};

int main()

{

UART_DRV_Init(4, &uartStatee, &uartConfigg); // initialise the uart module
configure_uart_pins(UART4_IDX); // initialise the pins for the uart module

while(1)

{

UART_DRV_SendDataBlocking(4, "this is a string\r\n", strlen("this is a string\r\n"), 100);

}

// uart isr

void UART4_RX_TX_IRQHandler(void)
{
UART_DRV_IRQHandler(4);
}

--------------------------------------------------------------------------------------

the code is as simple as written above

Note1 : non-blocking function is still working fine. however, if I don't put any delay after calling the non-blocking function that will screw up everything. it prints off rubbish. it was not like this at all.

Note 2 : my micro runs mqx os though. KSDK Mqx

Note 3: the semaphore seems to be working for other modules well. it is only happening with UART driver.

any help! I am very thankful in advance

Re: Kinetis SDK UART Driver (MQX)

_ZZ_ — Sat, 23 Sep 2017 20:34:38 GMT

Found the answer, the interrupt should be install by MQX function

topic Re: Kinetis SDK UART Driver (MQX) in Kinetis Software Development Kit

Kinetis SDK UART Driver (MQX)

Re: Kinetis SDK UART Driver (MQX)