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led on-off help me

 
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jul 18, 2007 12:39 pm     Reply with quote
Use the routines in the 2nd link. Do something like this:
Code:

void main()
{
int8 led_state;

led_state = 0;
output_low(LED_PIN);

while(1)
  {
   wait_for_keypress();
   
   led_state = !led_state;
   output_bit(LED_PIN, led_state);
  }

}


Port A doesn't have any internal pullups on it for your PIC.
That's why that function gives an error message.
tony
Guest
PostPosted: Wed Jul 18, 2007 2:13 pm     Reply with quote
You do realize RA4 has an open collector output. If you do not have a pullup on the pin the button may never look high.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jul 18, 2007 2:30 pm     Reply with quote
He's using pin A4 as an input.
Quote:

used a RA4 as button

#define P1 PIN_A4

value = input(P1);

However, he does need a pull-up on that pin, to use it with a push-button
switch. If he is using a PicDem2-Plus board, it already has one on pin A4.
Guest
PostPosted: Thu Jul 19, 2007 5:24 am     Reply with quote
mmmm always the same problem...
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