Re: [avr-chat] Mega644 bit test problem

[Piotr Nikiel]

On May 8, 2009, at 11:41 AM, Robert von Knobloch wrote:

> Hallo,
>
> I am writing code for an ATMega 644P and have come across some very
> strange behaviour.
> A small part of the code is required to read an asynchronous serial
> signal (data & clock - low speed) over PORTB pins.
> The relevant code snippet is:
>
> snip
> #define CLOCK_TIMEOUT    2000
> #define ASYNCPIN    PORTB
> #define ASYNCCLK    0
> #define ASYNCDATA    3
>
>     for (i = 0 ; i < 16 ; ++i)
>     {
>         while ((ASYNCPIN & _BV(ASYNCCLK)) != 0)        // Wait for  
> clock low
(...)
Sorry for out of topic, but  shouldn't you use PINB instead of PORTB  
when reading pin state?

Regards,
PN