Dear sdcc users and developers,
At the past I used sdcc for 14 bit pic devices with success.Now I'd like to use
sdcc for a 16 bit pic microcontroller, but I have a problem just at the
beginning.
I tried to use timer interrupt, but my program was not able to run. After some
investigation, I found a misterious problem: Just defining an interrupt
routine, but not using it (disabled interrupts) makes the program unable to run.
At this point I cannot understand why? Just defining a never called routine can
make the program broken?
This is my example:
This works:
#include "pic18f46k22.h"
#pragma config XINST = OFF
#pragma config FOSC = HSHP
#pragma config WDTEN = OFF
#pragma config MCLRE = EXTMCLR
#pragma config CP0 = ON
#pragma config CP1 = ON
#pragma config CP2 = ON
#pragma config CP3 = ON
#pragma config CPB = ON
#define PORTC_OUTPUT_LED1 (0b00010000)
#define PORTD_OUTPUT_LED2 (0b00001000)
// No iterrupt routine defined
void main(void) {
TRISC = 0;
TRISD = 0;
LATC = PORTC_OUTPUT_LED1; // Leds should be switched on as the program
starts run.
LATD = PORTD_OUTPUT_LED2;
while(1) {
}
}
This one does not work: (The similar program with an interrupt routine defined,
but interrupts were not enabled at all.)
#include "pic18f46k22.h"
#pragma config XINST = OFF
#pragma config FOSC = HSHP
#pragma config WDTEN = OFF
#pragma config MCLRE = EXTMCLR
#pragma config CP0 = ON
#pragma config CP1 = ON
#pragma config CP2 = ON
#pragma config CP3 = ON
#pragma config CPB = ON
#define PORTC_OUTPUT_LED1 (0b00010000)
#define PORTD_OUTPUT_LED2 (0b00001000)
// Interrupt routine defined, but never used before interrupts are disabled by
default.
// This makes the code actually unable to run! sdcc bug? gputils bug?
void interruptHigh (void) __interrupt 1 {
if(INTCONbits.TMR0IF) { // Timer0 overflow interrupt
INTCONbits.TMR0IF = 0; // ACK
}
}
void main(void) {
TRISC = 0;
TRISD = 0;
LATC = PORTC_OUTPUT_LED1; // Leds should be switched on as the program
starts run.
LATD = PORTD_OUTPUT_LED2;
while(1) {
}
}
The program has an interrupt routine but the interrupts were not enabled (after
reset, interrupts are disabled by default.) After programming it into the pic,
the two leds swould be switched on soon. But it does not occur.When I delete
the unused interrupt routine from the source and compile and reprogram the pic,
it works. The two led switched on.
Did I miss something?
It is not lear to me when and how should use extended instruction set or it is
necessary?
I use PIC18F46K22
sdcc version:SDCC :
mcs51/gbz80/z80/z180/r2k/r3ka/ds390/pic16/pic14/TININative/ds400/hc08/s08 3.2.1
#8437 (Feb 22 2013) (MINGW32)
gputils version:gpasm-1.0.0 #925 (Dec 23 2012)
compiling and linking:
sdcc -S -mpic16 -p18f46k22 -I. test.c
gpasm -c test.asm
gplink -s 18f46k22_g.lkr test.o libdev18f46k22.lib
Thanks in advance,
Tamas
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