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isr_evt_set problem

Kirill Novoskoltsev

Hi, All!

My problem is exactly the same as http://www.keil.com/forum/13634/

void UARTHandler (void) __irq {
   isr_evt_set(0x0001,UART_TASK);
  //use "os_evt_set" works
}


void task_UART_received (void) __task  {
   for(;;) {
      //can not get here if I use "isr_evt_set":

      os_evt_wait_or(0x0001,0xffff);
      ......
   }
}


I could not reach os_evt_wait_or section, program is always pending in irq interrupt.
But if I change isr_evt_set to os_evt_set everything work fine.

Task task_UART_received is created before first UART interrupt occurs.
I don't understand where error is.
Do you have some ideas about? Thank you.

  • 0

    Don't you think you should service the UART before returning from the ISR? Wouldn't you think the UART will request a new interrupt if you don't service it?

    You normally have the ISR pick up any received characters (or send out any outgoing characters). Then you have a thread process the received and queued data, or compute more data to queue for transmission when the UART becomes ready again.

  • 0

    First
    could you post the Id chip (LPC24xx, LPC3250 ?)

    Secondly
    if you're working with MCB2300, check if all uart interrupt event have been validate (see uart register)