gremlins in my pic!!

MrDEB · Mar 25, 2017

a real simple test code to make sure all the leds are operational but have gremlins in my code or pic?? must be a full moon
when I first apply power all the leds light. Then they all go off and then start cycling on/ off as per code. This should work?? Must have something really dumb in my code??

DEVICE = 18f2420

CLOCK = 8

INCLUDE "InternalOscillator.bas"

INCLUDE "SetDigitalIO.bas"

DIM x AS BYTE

x = 0

trisc =%00000000

portb = 0

WHILE true

FOR x = 0 TO 7

portc.bits(x) = 1

DELAYMS(1000)

portc.bits(x) = 0

DELAYMS(1000)

NEXT

WEND

Ian Rogers · Mar 25, 2017

If you have the SE version of swordfish, I would check that "SetDigitalIO.bas" has the ability to turn off the ADC on PORTB otherwise you need to edit the Config to disable the PBADEN bit!!

EDIT!! Sorry I saw the PORTB =0 and assumed PORTB...

I would use the Latch rather than the port register LATC.bits(x) =0;

Ian Rogers · Mar 25, 2017

Okay.... You included "SetDigitalIO.bas" but you haven't called the SetAllDigital() function..

But!! I have simulated it and it works okay... Have you a copy of "InternalOscillator.bas" to hand?

picbits · Mar 25, 2017

May sound obvious but you have decoupling capacitors on the PIC voltage rail ? They do weird things when they aren't adequately decoupled.

large_ghostman · Mar 27, 2017

picbits said:
May sound obvious but you have decoupling capacitors on the PIC voltage rail ? They do weird things when they aren't adequately decoupled.

I nominate for under stament of the year award . lol

gremlins in my pic!!

MrDEB

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gremlins in my pic!!

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