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COM ISR not being linked

Montana Reid

Good afternoon,

I'm trying to register a serial (com-0) interrupt using uVision 3 on the Cypress FX2LP. The code compiles fine, but the linker warns:

WARNING L16: UNCALLED SEGMENT, IGNORED OVERLAY PROCESS
SEGMENT: ?PR?COM_ISR?MAIN

My ISR looks like this:

static void com_isr (void) interrupt 4 {
        char c;

        if (RI) {
                c = SBUF0;    // read character
                RI = 0;       // clear interrupt request flag
                if (istart + ILEN != iend) {
                inbuf[iend++ & (ILEN-1)] = c;
                }
        }

        if (TI != 0) {
        TI = 0;                  // clear interrupt request flag
        if (ostart != oend) {    // if characters in buffer and
                SBUF0 = outbuf[ostart++ & (OLEN-1)];        // transmit character
                sendfull = 0;
        }
                else {  // if all characters transmitted
                        sendactive = 0;                 // clear 'sendactive'
                }
        }
}

This code is pretty much copy and pasted from the Keil Help section on Serial Transmission.

This ISR is not being called, even with IE=0x80 (to enable global interrupts) and ES0 = 1 (to enable serial 0 interrupts). Does anyone have any suggestions?

Thanks,

Montana

Parents Reply Children
  • 0 in reply to Andy Neil

    I tried removing static - that didn't work. I also tried adding a method prototype - with no result.

    I've changed the method header to

    void com_isr(void)

    and I have changed my putchar and getchar methods to run com_isr() until the buffers are empty. I also have

    while (TI == 1 || RI == 1) com_isr();

    I've disabled interrupts for the time being. This works for my application, but is a dirty trick to use (and is a bit concerning, since I could miss some received data if my processor is off doing something and doesn't call com_isr() as often as it should). Luckily sending the data is much more important than receiving (receive is just an ACK, and I haven't lost one yet since the processor doesn't do much else).

    I'll post back here if I ever resolve the issue ... unfortunately I must move on.

    Thanks for the suggestions,

    Montana

  • 0 in reply to Montana Reid

    My ISR looks like this:

    void com_isr (void) interrupt 4 {

    every Keil user has such working did you retype and 'skip' an error in the code?

    Erik

  • 0 in reply to ²erik malund

    You haven't set the option to disable vector table generation, have you...?

  • 0 in reply to Andy Neil

    I think you got it, noiv will definetely do it if the vector is not set in assembler (I guess that would be the only way to do it manually)

    I have used noiv for bootloader/app switch, but see no other use - any takers?

    Erik