Hi,

I'm trying to use PORTD.0 and PORTD.1 (the ones used for programming the nerdskit Atmega168 chip) as standard output pins, but they are always at logic high. Are these pins set for serial only by fuse bits or am I just missing something in the code/circuit ?

They're set for serial I/O during the bootloader which runs before your program does. You should just be able to disable the UART in your program, after the bootloader starts you up, and they'll become normal pins again.

PD0 and PD1 can be used (I have done it). Like bretm said, the bootloader turns on the UART module before it runs your code... But, not only do you not include uart.h in your code, you need to put

UCSR0B = 0;

into your main function.

Humberto explains it here, in this thread.

It worked for me :).

Dave

Awesome! Thanks so much guys, didn't even think of disabling the UART.