#include <avr/io.h>
#include <avr/interrupt.h>
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
int main (void)
{
UCSRB |= (1 << RXEN) | (1 << TXEN); // Turn on the transmission and reception circuitry
UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes
UBRRL = BAUD_PRESCALE; // Load lower 8-bits of the baud rate value into the low byte of the UBRR register
UBRRH = (BAUD_PRESCALE >> 8); // Load upper 8-bits of the baud rate value into the high byte of the UBRR register
UCSRB |= (1 << RCXIE); // Enable the USART Recieve Complete interrupt (USART_RXC)
sei(); // Enable the Global Interrupt Enable flag so that interrupts can be processed
for (;;) // Loop forever
{
// Do nothing - echoing is handled by the ISR instead of in the main loop
}
}
ISR(USART_RXC_vect)
{
char ReceivedByte;
ReceivedByte = UDR; // Fetch the recieved byte value into the variable "ByteReceived"
UDR = ReceivedByte; // Echo back the received byte back to the computer
}
#define F_CPU 8000000UL
#include <stdlib.h>
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include "rprintf.h"
#include "uart.h"
//--------------------------------------------------
void init_HW();
void rx_handler(unsigned char c);
//--------------------------------------------------
void rx_handler(unsigned char c){
// Do simething with recieved character `c'
}
int main( void ){
_delay_ms(100);
init_HW();
// Send to serial port
rprintf("Hello world!\n");
while(1);
return 0;
}
void init_HW(void){
uartInit();
uartSetBaudRate(4800);
rprintfInit(uartSendByte);
uartSetRxHandler(rx_handler);
sei();
}
دیدگاه