How can we display pulses at GPIO4 and GPIO5 at the same time in PIC12f629

Please let me know if any one has an idea

Thanks and Best Regards

Display on what?

DISPLAY ON OSCILLOSCOPE

I have created a simple program to generate pulses.

I want to see 1 pulse on GPIO4 and other on GPIO5

But the delay in the loops are getting added and I am not getting the desired result.

Following is my code:

I have not mentioned the variables definition here.

movlw .44 ;on time of pulse #1
movwf M1
movlw .44 ;off time of pulse #1
movwf M2

movlw .160 ;on time of pulse #1
movwf M3
movlw .160 ;off time of pulse #1
movwf M4


goto main

main:

call lowtest,hightest
;decfsz COUNTER,1
;call hightest
goto main

;goto loop1


lowtest:
bsf GPIO,5
call Delay
bcf GPIO,5
call Delay1
return

Delay movf M1,0
movwf COUNTER
nop
decfsz temp,f
goto $-2
decfsz COUNTER,f
goto $-4
retlw 00


Delay1 movf M2,0
movwf COUNTER1
nop
decfsz temp1,f
goto $-2
decfsz COUNTER1,f
goto $-4
retlw 00

;loop1:

hightest:
bsf GPIO,4
call Delay2
bcf GPIO,4
call Delay3
return

Delay2 movf M3,0
movwf COUNTER2
nop
decfsz temp2,f
goto $-2
decfsz COUNTER2,f
goto $-4
retlw 00

Delay3 movf M4,0
movwf COUNTER3
nop
decfsz temp3,f
goto $-2
decfsz COUNTER3,f
goto $-4
retlw 00

end

Slow your pulses down enough to see em flash LEDs then debug. don't need a scope. Just introduce a common delay loop, perhaps one with 3, 8 bit variables nested to slow things down enough. Remember at 4Mhz a single instruction takes 1 us, a goto or call takes 2 us, so u can predict loop timings exactly.

but slowing down will not give me the exact frequency.

I am not able to get two pulses of the desired frequency.

The delays are getting added and hence the frequency of the pulses are affected.

Is there any way I can avoid this?

I have the delay loops for both pulse generated in the same code.
I want to know how I can keep the delay loops for first pulse isolated from 2nd.

VRL_15 said:

<SNIP>

Delay movf M1,0
movwf COUNTER
nop
decfsz temp,f
goto $-2
decfsz COUNTER,f
goto $-4
retlw 00

</SNIP>

Click to expand...

What is '0'?

0 indicates that the destination register is W

MPLAB has a simulator with a stopwatch.