Hello,
I'm new to SDCC and microcontrollers - my first two very simple
programs burned into PIC16F88 and working! :)
Now I'm trying something little harder than just lighting LEDs - I
want to try the interrupt system.
PIC16F88 has one external interrupt - on pin RB0.
I'm trying the following very simple program, but something is wrong:
#define __16f88
#include"pic/pic16f88.h"
typedef unsigned int word;
word at 0x2007 __CONFIG = 0x3f70;
void isr_high(void) interrupt 1 {
if (RB0 == 1) RA1 = 0;
}
void main(void) {
TRISA = 0;
while(1) {
RA1 = 1;
}
}
I expect when I run this to have pin RA1 '1', untill RB0 is pulled
'1'. Then RA1 should go '0' untill RB0 is released.
I'm running that at gpsim and there RA1 is always '1'. When I run the
program step by step I see it never enters the interrupt code section.
So, how can I define an interrupt? I've searched a lot through the
documentation of SDCC and the only piece of value I've found is the
'void isr_high interrupt 1' function I'm using.
Is there a more complicated/simplified way to code an interrupt?
Thanks,
Ivan.
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