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PIC16F1829 problem with A0, A1 as inputs?

 
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wavelength



Joined: 21 Mar 2014
Posts: 12

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PIC16F1829 problem with A0, A1 as inputs?
PostPosted: Tue Oct 14, 2014 1:41 pm     Reply with quote
All,

I have the AC244043 module and have a simple program reading A0, A1 as inputs and acting on them. With the module and the debugger I can read these high and low all day long.

When I set the DEBUG features off (verified in ccsload) and program a part both A0 and A1 are read as 0 all day long.

I have ADC mode set to OFF, and the TRIS for A is read and looks fine in the debugger. I am not even using fast IO.

Any ideas?
Thanks,
Gordon
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J. Gordon Rankin
Wavelength Audio, ltd.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Oct 14, 2014 5:59 pm     Reply with quote
Quote:

When I set the DEBUG features off (verified in ccsload) and
program a part both A0 and A1 are read as 0 all day long.

I assume this means you're programming a normal 16F1829 chip,
not the header, and not the -ICE version. Just a normal PIC.
I did that and it works.

I installed a 16F1829 on a Microchip Low Pin Count board. My board
has a push-button switch added to it, with a 4.7K pullup and the other
side of the switch is connected to ground. So when it's not pressed,
the switch circuit delivers +5v and when it's pressed it gives ground.

I compiled the program below with compiler vs. 5.030 and programmed
the 16F1829 with a PICkit3. I used MPLAB vs. 8.92 as the IDE. I am
running it in Release mode.

I jumpered the switch circuit to Pin A0 of the 16F1829. When I run the
program, the LED on Pin C0 is turned on when the button is not pressed,
and it's off when I press the button. This is correct operation. I also
tested the program with the input pin set to Pin A1. It also works.

Code:
#include <16F1829.h>
#FUSES INTRC_IO, NOWDT, BROWNOUT
#use delay (clock=4M)

//=================================
void main()
{

while(TRUE)
  {
   if(input(PIN_A0))
      output_high(PIN_C0);
   else
      output_low(PIN_C0);

   delay_ms(100);
  }


}
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