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Why wont pin toggle???

 
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arloedx



Joined: 21 Aug 2009
Posts: 15
Location: Texas

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Why wont pin toggle???
PostPosted: Fri Jun 04, 2010 10:18 am     Reply with quote
I am trying to make PIN_A4 of a PIC18F252 toggle from low to high but it will not work. I try the same code on PIN_A3 and it works perfectly. What am I doing wrong???

Code:

#include <18f252.h>

#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=10000000)

void main()
{
   setup_port_a(NO_ANALOGS); //no analog inputs
   set_tris_a(0x00); //all outputs
   while(TRUE)
   {
      output_low(PIN_A4);
      output_low(PIN_A3);
      delay_ms(1000);

      output_high(PIN_A4);
      output_high(PIN_A3);
      delay_ms(1000);
   }
}

mkuang



Joined: 14 Dec 2007
Posts: 257

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Reply
PostPosted: Fri Jun 04, 2010 11:14 am     Reply with quote
On page 10 of the PIC18F252 datasheet it says regarding RA4:

Digital I/O. Open drain when configured as output.

You will need external pullup for it to work. Also you don't need this line:
Code:

set_tris_a(0x00); //all outputs

The compiler set the direction of the pins for you when you use the output_high function.
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