serial/main.c


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#include <avr/io.h>
#include "uart.h"

int main(void)
{
    /* serial */
    uart_init();

    /* D4 = output and high (=> atx down) */
    PORTD |= 0x10;
    DDRD  |= 0x10;

    for (;;)
    {
        switch(uart_getchar()) {
            case '?': break; /* useful for auto documentation */
            case '0': PORTD |=  0x10; break;
            case '1': PORTD &= ~0x10; break;
            case 'T': PORTD ^=  0x10; break;
        }
        uart_putchar((PORTD & 0x10) ? '0' : '1');
    }

    return 0;
}