[avr-chat] Getting started

[J D Freeman]

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I am trying to relearn the use of AVR's after far to long of not using
them. And I am struggling to get something incredibly simple working.
Whats more, I can't seem to find any useful documentation on it.

Put simply, I want to use the input from switch to toggle an LED.

I have an Atmega168.

There is an LED attached to PC4 and a switch between PD0 and +5v.

I then have:

        /* set PC4 to output */
        DDRC |= (1<<DDC4);
        /* set PD0 to input and enable pullups */
        DDRD = (0<<DDC0);
        PORTD = 0x00;

        while(1)
        {
                uint8_t x;
                x = PIND;
                if( x != 0)
                {
                        /* Toggle PC4 */
                        PORTC ^= (1<<PC4);
                }
        }

The code compiles fine. It just doesn't seem to do something. I am sure
I have missed something really simple. I just can't find a good example
of someone reading a single input pin. I did find a few examples of
using 8 inputs, but even they they didn't help much. 

Thanks in advance.

J


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