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TARGET=beep_libpca
SOURCES=beep_libpca.c

DEPS=
COBJ=$(SOURCES:.c=.o)
PCA_PREFIX=../pca

CC=avr-gcc
OBJC=avr-objcopy
MCU=atmega328p

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void serial_init() {

	power_usart0_enable();

	// configure ports double mode
	UCSR0A = _BV(U2X0);

	// configure the ports speed
	UBRR0H = 0x00;

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unsigned char serial_poll_recv(unsigned char *a_data, unsigned int a_size) {
	unsigned int cnt = a_size;

	while (a_size) {
		/* Wait for data to be received */
		while ( !(UCSR0A & (1<<RXC0)) );

		/* Get and return received data from buffer */
		*a_data = UDR0;
		a_data++;

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typedef struct _t_buffer {
	/// data storage space for the ring buffer
	volatile unsigned char ring[SERIAL_RX_RING_SIZE];

	/// head index
	volatile unsigned char head;

	/// tail index
	volatile unsigned char tail;

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// the RX ring buffer
static volatile t_buffer g_rx_buff;

ISR(USART_RX_vect, ISR_BLOCK) {

	// no frame error
	// UCSR0A must be read before UDR0 !!!
	if (bit_is_clear(UCSR0A, FE0)) {
		/// must read the data in order to clear the interrupt flag
		volatile unsigned char data = UDR0;

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ISR(USART_UDRE_vect, ISR_BLOCK) {
	
	// proceed if there still is data to be send
	if (g_tx_buff.head != g_tx_buff.tail) {
		UDR0 = g_tx_buff.ring[g_tx_buff.tail];
		g_tx_buff.tail = (g_tx_buff.tail + 1) % SERIAL_TX_RING_SIZE;
	}
	else {
		// mask the interrupt everything has been send
		UCSR0B &= ~_BV(UDRIE0);

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#include "pca.h"

int main(int argc, char const *argv[])
{
	uint8_t c = 0x00;

	serial_init(E_BAUD_57600);
	serial_install_interrupts(E_FLAGS_SERIAL_RX_INTERRUPT);
	serial_flush();

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void _serial_putc(char c, FILE *stream) {
	if ('\n' == c) {
		_serial_putc('\r', stream);
	}

	while (!serial_sendc(c));
}


char _serial_getc(FILE *stream) {

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#include "pca.h"
#include <util/delay.h>

int main(void)
{
	int cnt = 0;

	serial_init(E_BAUD_9600);	
	serial_install_interrupts(E_FLAGS_SERIAL_RX_INTERRUPT);
	serial_flush();

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/**
 * @brief if there are no SEND/RECV routine definitions already existing
 *  use the default definitions provided bellow
 */
#if !defined(SLIP_CHAR_SEND) || !defined(SLIP_CHAR_RECV)

#include "config.h"
#include "serial.h"

/// redefine it, in your code to use different implementation of SEND routine