Pic Assembly programming

  • Thread starter rsegecin
  • Start date
  • #1
2
0
Hi. I'm learning how to program in assembly to PICs and I'm stuck quite a while in a problem trying to figure out how to read an input value. I've been googling a lot and it seems that my code it's fine but as I'm beginning to learn I would like to know if any of you guys could tell me if its really ok.

Code:
#include <P16F688.inc>

ORG 	0x00
goto 	main

main:
	banksel		TRISC
	movlw 		B'00000100'
	movwf		TRISC
	
loop:
	banksel		PORTC
	btfsc		PORTC, RC2
	call 		blinkRed
	
	btfss		PORTC, RC2
	call 		blinkGreen	
goto 	loop

blinkRed:
	banksel		PORTC
	bsf			PORTC, 1
	bcf			PORTC, 0
	;movlw 		B'00000010'
	;movwf		PORTC		
return

blinkGreen:
	banksel		PORTC
	bcf			PORTC, 1
	bsf			PORTC, 0
	;movlw 		B'00000001'
	;movwf		PORTC	
return

end
Thank you very much.
 

Answers and Replies

  • #2
chiro
Science Advisor
4,790
132
Hey rsegecin and welcome to the forums.

I'm not familiar with this kind of assembler, but is the information you are trying to read meant to be coming from a hardware port?
 
  • #3
2
0
Hi chiro thank your very much for the reply. I've just found out that if I left the code the way I mentioned in the post above the ports were configured by default as analog inputs therefore to get a discrete value 0, 1 wouldn't work as an analog input has to have some others configurations to work properly. So I just needed to set them as digitals IO.

I'm posting the code for future reference to others:

Code:
#include <P16F688.inc>

ORG 	0x00
goto 	main

main:
	banksel		ANSEL
	movlw 		B'00000000'
	movwf		ANSEL
		
	banksel		TRISC
	movlw 		B'00000100'
	movwf		TRISC

loop:
	banksel		PORTC

	btfsc		PORTC, 2
	call 		blinkRed	

	btfss		PORTC, 2	
	call 		blinkGreen
goto 	loop

blinkRed:
	banksel		PORTC
	movlw 		B'00000010'
	movwf		PORTC		
return

blinkGreen:
	banksel		PORTC
	movlw 		B'00000001'
	movwf		PORTC	
return

end
 

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