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/*
 * usart.h
 *
 *  Created on: 08.03.2010
 *      Author: tecdroid
 */

#ifndef USART_H_
#define USART_H_
#include <avr/io.h>
#include <avr/iox128a1.h>

void usart_init () {
	/* This PORT setting is only valid to USARTC0 if other USARTs is used a
	 * different PORT and/or pins is used. */
	/* PIN3 (TXD0) as output. */
	PORTC.DIRSET = PIN3_bm;

	/* PC2 (RXD0) as input. */
	PORTC.DIRCLR = PIN2_bm;

	// enable tx rx double clock
	USARTC0.CTRLB = USART_RXEN_bm | USART_TXEN_bm | USART_CLK2X_bm;

	// asynchronous, char size is 8 bit, no parity, one stop bit
	USARTC0.CTRLC = USART_CHSIZE_8BIT_gc | USART_PMODE_DISABLED_gc;
}

void usart_setRecvInt (uint8_t enable) {
	if (enable) {
		USARTC0.CTRLA |= USART_RXCINTLVL_HI_gc;
	} else {
		USARTC0.CTRLA &= ~(USART_RXCINTLVL_HI_gc);
	}
}

void usart_setSpeed (uint32_t speed) {
	uint8_t bsel = (F_CPU / (8 * speed)-1);
	USARTC0.BAUDCTRLA = bsel & 0xff;
	USARTC0.BAUDCTRLB = (USARTC0.BAUDCTRLB & 0xf0) + ((bsel >> 8) & 0x0f);
}

uint8_t usart_canSend () {
	return USARTC0.STATUS & USART_TXCIF_bm;
}

void usart_sendByte(uint8_t byte) {
	USARTC0.DATA = byte;
}

void usart_sendData (uint8_t *data, uint16_t count) {
	uint16_t i;
	for (i = 0; i < count; i++) {
		while (!usart_canSend()) ;
		usart_sendByte(data[i]);
	}
}

uint8_t usart_hasByte () {
	return USARTC0.STATUS & USART_RXCIF_bm;
}
uint8_t usart_getByte () {
	return USARTC0.DATA;
}

void usart_getData (uint8_t *data, uint16_t count) {
	uint16_t i;
	for (i = 0; i < count; i++) {
		while (!usart_hasByte()) ;
			data[i] = usart_getByte();
	}
}
#endif /* USART_H_ */

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/*
 * main.c
 *
 *  Created on: 17.03.2010
 *      Author: tecdroid
 */

#include <avr/io.h>
#include <avr/iox128a1.h>

#include "usart.h"

void sync_osc() {
	/*Oscillator auf 32Mhz einstellen*/
	OSC.CTRL |= OSC_RC32MEN_bm;
	/*Wenn Oscillator stabil wird das Flag RC32MRDY
	 * gesetzt und 32Mhz können benutzt werden*/
	while (!(OSC.STATUS & OSC_RC32MRDY_bm)) {
	}

	/*I/O Protection*/
	CCP = CCP_IOREG_gc;
	/*Clock auf 32Mhz einstellen*/
	CLK.CTRL = CLK_SCLKSEL_RC32M_gc;

	/* auto kalibierung ein */
	DFLLRC32M.CTRL = DFLL_ENABLE_bm;
}


int main(int argc, char **argv) {
	/*
	 * initializations
	 */
	sync_osc();
	usart_init();
	usart_setSpeed(9600);

	uint8_t byte;
	/*
	 * endles loop for running cpu
	 */
	while (1) {
		if (usart_hasByte()) {
			byte = usart_getByte();
			usart_sendByte(byte);
		}
	}
	return 0;
}