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
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