Some old AVR projects
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#include <avr/io.h>
#include <util/delay.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <stdbool.h>
#include <stdint.h>
#include "lib/meta.h"
#include "lib/uart.h"
const char str[] PROGMEM = "Hello UART!\r\n";
// Echo, but with ROT13.
ISR(USART_RX_vect)
{
char c = uart_rx();
if (c == 13) {
uart_tx(10);
uart_tx(13);
return;
}
if ((c >= 'a' && c <= 'm') || (c >= 'A' && c <= 'M')) {
c += 13;
} else
if ((c >= 'n' && c <= 'z') || (c >= 'N' && c <= 'Z')) {
c -= 13;
}
uart_tx(c);
}
void SECTION(".init8") init()
{
uart_init(9600);
uart_isr_rx(1);
sei();
}
void main()
{
uart_puts_pgm(str);
while(1);
}