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Applies to: C51 C Compiler


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Is there a good way to handle unused 8051 interrupts in C?


Yes. In fact, there are a number of good ways to do this. The following is just one of them:

First, create a simple, generic "unused interrupt service routine handler." This routine might appear as follows:

void unused_ISR_handler (
  unsigned char interrupt_number)
/* log the interrupt_number */

The purpose of such a routine is to either log the spurious interrupt and continue execution or output the interrupt number and halt program execution.

Next, create a simple interrupt service routine for each unused interrupt:

void ex0_ISR (void) interrupt 0
unused_ISR_handler (0);

void sio_ISR (void) interrupt 4
unused_ISR_handler (4);

And, call the handler inside each ISR.

Article last edited on: 2005-01-30 16:45:56

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