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Interrupt termination

 
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Tom_HUN
Guest
Interrupt termination
PostPosted: Mon Mar 24, 2008 1:22 am     Reply with quote
Hi!
Is it possible, to terminate an interrupt routine? I mean, I want to forget about the PCLATH and go to a completely different place, from where the ISR routine was called. I'm running a menu on the LCS screen. There are sub-functions, reachable by pushing buttons. The EXT interrupt is caused by one button (16F877 - B0). I want the isr to go back to the menu function. I can not do by calling it, because then it will run inside the isr (not running - using too much PCLATH). So, what is the solution?

Menu function:

Code:
void Menu()
{
   
   output_low(PIN_B5);
   output_low(PIN_B4);
   output_low(PIN_B3);
   lcd_putc("\f     Tesztpanel\n");
   lcd_putc("1:INT 2:ADC 3:LED");
   delay_ms(500);
while(1)
{
   if (!input(PIN_B1))
   ADC();
   if (!input(PIN_B2))
   LED();
}


ISR:
Code:

#int_EXT
void ISR()
{
//?????????????????
}

What to do to terminate everything, and go to the menu funct? Except reset_cpu(). Confused
Ttelmah
Guest
PostPosted: Mon Mar 24, 2008 3:10 am     Reply with quote
Write your main code, so it tests a flag, and calls the menu if this is set. Set the flag in the ISR.
Do a search here, a lot of examples have been posted in the past.

Best Wishes
Tom_HUN
Guest
PostPosted: Mon Mar 24, 2008 3:36 am     Reply with quote
Ttelmah wrote:
Write your main code, so it tests a flag, and calls the menu if this is set. Set the flag in the ISR.
Do a search here, a lot of examples have been posted in the past.

Best Wishes


Thanks fot the idea! It's working like charm! Very Happy

All the very best from Hungary!
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