AVR-Chat

I checked the voltage on the pins and they were all 4.87-4.98V, the same as
the outputs.
Activating pull-ups didn't make any difference.
This code:
  sensors = PINA;
  sensors &= 0xF0;
didn't compile any differently to:
  sensors = PINA & 0xF0;
Jack.


----- Original Message ----- 
From: Dave VanHorn
To: AVR-Chat@yahoogroups.com ; AVR-Chat@yahoogroups.com
Sent: Saturday, August 28, 2004 8:15 AM
Subject: Re: [AVR-Chat] PORTA input problems


At 04:46 PM 8/27/2004, Jack Valmadre wrote:

>I forgot to mention that I tested pins 0-3 on PORT A as outputs and they
>worked fine.
>I have also tried connecting an LED to the output of the comparator where
it
>would usually be connected to the Atmel and it went on/off as expected.
>Jack.

Sounds like you've done all the basics.
Have you checked that you're actually getting the signals on the chip pins,
as opposed to the socket pins, or PCB traces? I've been fooled before, with
bad socket pins.

In assembler, I would set the appropriate bits in DDRA as 0 for input, set
the PORTA bits high for pullups, and then IN TEMP,PINA and mask as
appropriate.



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