Tester obvodu 7400: Rozdiel medzi revíziami

#include <avr/io.h> 
#include <util/delay.h> 
#include <stdio.h> 
#include "uart.h" 
FILE mystdout = FDEV_SETUP_STREAM(uart_putc, NULL, _FDEV_SETUP_WRITE);
#define F_CPU 16000000UL
#define BAUD 9600

#define NAND_A_PIN PD6 
#define NAND_B_PIN PD7
#define NAND_OUT_PIN PB0

void init_pins() {
    DDRD |= (1 << NAND_A_PIN) | (1 << NAND_B_PIN);
    DDRB &= ~(1 << NAND_OUT_PIN); // Nastavit pin jako vstup
}

void send_input_signals(uint8_t a, uint8_t b) {
    if (a) PORTD |= (1 << NAND_A_PIN);
    else PORTD &= ~(1 << NAND_A_PIN);
    if (b) PORTD |= (1 << NAND_B_PIN);
    else PORTD &= ~(1 << NAND_B_PIN);
}

uint8_t read_output_signal() {
    return PINB & (1 << NAND_OUT_PIN);
}

int main() {
    init_pins();
    uart_init();
    stdout = &mystdout;
    printf("Kombinacie:\n");

    for (;;) {
        send_input_signals(1, 0); 
        printf("Vystup pro 10: %d\r\n", read_output_signal());
        _delay_ms(1000); 

        send_input_signals(1, 1); 
        printf("Vystup pro 11: %d\r\n", read_output_signal());
        _delay_ms(1000); 

        send_input_signals(0, 1); 
        printf("Vystup pro 01: %d\r\n", read_output_signal());
        _delay_ms(1000); 

        send_input_signals(0, 0); 
        printf("Vystup pro 00: %d\r\n", read_output_signal());
        _delay_ms(1000); 
    }

    return 0; 
}