sysprog-basic/print/main.c

#define F_CPU 16000000UL
#define __AVR_ATmega328P__
#include <avr/interrupt.h>
#include <avr/io.h>
#include <util/delay.h>
#include "../include/uart.h"
#include "../include/adc.h"
#include "../include/rand.h"

#define BAUD 9600
#define MYUBRR F_CPU/16/BAUD-1


int main (void)
{
    uart_init();
    adc_init();
    sei();

    uint16_t sensor[2] = { 0, 1 };

    while (1)
    {
        // lets say we read some value from a sensor
         sensor[0] = adc_read(0);
         sensor[1] = adc_read(1);
        // we want to print this, so we store the ascii repr in our buffer
        uart_printi("sensor 0: ", sensor[0]);
        uart_printi("sensor 1: ", sensor[1]);
        uart_printi("sensor 2 (noise): ", adc_read(2));
        uart_printi("rand: ", rand());
        _delay_ms(1000);
    }
}

ISR (USART_RX_vect) {
    // echo the message
    char c = UDR0;
    uart_printc(c);
}