Re: [Sdcc-user] PIC interrupts still broken?

[<bra...@ca...>]

  I think they still are.  Check the .asm file generated by SDCC. I 
found 2 errors(see below).
     Since the interrupt vector starts at address 4, there needs to be 
3(not 2) nop instructions in the STARTUP code section.  Farther 
down the listing in the actual interrupt listing, the 	GOTO	
END_OF_INTERRUPT+1  instruction must be removed(the next 3 
nop's can also be removed).  the GOTO jumps to a GOTO $ 
instruction which is an endless loop!  I manually remove these then 
have SDCC assemble and link the file and the program then works.


; reset and interrupt vectors 
;--------------------------------------------------------
STARTUP	code
	goto	__sdcc_gsinit_startup
	nop
	nop
	goto	__sdcc_interrupt
;--------------------------------------------------------
; initialization and interrupt code 




;--------------------------------------------------------
code_init	code	0x10
__sdcc_gsinit_startup:
	pagesel _main
	goto _main
__sdcc_interrupt:
;***
;  pBlock Stats: dbName = I
;***
;entry:  _rs232_isr	;Function start
; 0 exit points
;functions called:
;   _getc
;   _getc
;; Starting pCode block
_rs232_isr	;Function start
; 0 exit points
;#CSRC	C:/sdcc/PIC/testswitch.c 39
;  void rs232_isr(void) interrupt 0
	GOTO	END_OF_INTERRUPT+1
	NOP	
	NOP	
	NOP	
	MOVWF	WSAVE


On 23 Jul 2003 at 2:10, John Ford wrote:

> Are the PIC interrupts still broken? I'm using a 16f877 and the code seems
> to branch to the interrupt funtion one time only. But it is not
> successfully resetting PIR1. The code just gets stuck in a loop, jumping
> back to interrupt imediately after retfie. I've tried every permutation of
> how to reset the interrupt flags that I can think of, but nothing seems to
> work.
> 
> Thanks
> 
> 
> 
> 
> 
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