Xmega32A4U UART

/*

 * Hallo_Welt.c

 *

 * USARTC0, Tx Pin -> PC3.

 * 9600 baud mit 2 MHz clock. BSCALE = 0

 * BSEL = ( 32000000 / (2^0 * 16*19200)) -1 = 12

 * Fbaud = 32000000 / (2^0 * 16 * (12+1))  = 9615 bits/sec

 *

 *

 * Created: 02.05.2012 21:36:29

 *  Author: Daniel

 */ 

#include <avr/io.h>

#include <avr/interrupt.h>

#include <string.h>

//Variablen

char lenght = 0x00;

char Counter = 0x00;

int main(void)

{

  Clock_init();  

  Int_init();

  UART_init();

  TimerC0_init();  

  TimerC0_Freq(0x85ED);  

    while(1)

    {

    }

}

void Clock_init(void)

{  

  OSC.CTRL |= OSC_RC32MEN_bm;                                              // Oszillator auf 32Mhz stellen

  while(!(OSC.STATUS & OSC_RC32MEN_bm));                                        // Warten bis der Oszillator bereit ist

  CCP = CCP_IOREG_gc;

  CLK.CTRL = CLK_SCLKSEL_RC32M_gc;                                          // Clock auf 32MHz stellen                                              

}

void Int_init(void)

{

  PMIC.CTRL |= PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;                          // Interrupts (Highlevel, Mediumlevel und Lowlevel freigeben)

  sei();                                                        // Globale Interruptfreigabe

}

void UART_init(void)

{

  PORTC.DIR = 0xEF;  

  USARTC0.BAUDCTRLB = 0;                                                // BSCALE = 0 

  USARTC0.BAUDCTRLA = 0x67;                                                // Baudrate 19200 @ 41MHz

  USARTC0.CTRLB = USART_TXEN_bm | USART_RXEN_bm;                                    // RX+TX Enable CLK

  USARTC0.CTRLC = 0x03;                                                  // Async, no parity, 8 bit data, 1 stop bit

  USARTC0.CTRLA = 0;    

}

void TimerC0_init()

{

  TCC0.CTRLA = TC_CLKSEL_DIV1024_gc;                                          // Vorteiler einstellen

  TCC0.CTRLB = 0x00;                                                  // Timer in Normalmodus stellen

  TCC0.INTCTRLA = 0x03;                                                // Interrupt konfigurieren  

}

void TimerC0_Freq(int TTW)

{

  TCC0.PER = TTW;                                                    // Timer-Topwert(TTW) einstellen  

}

void Send_UART(char data[])

{

  lenght = strlen(data);

  while(Counter < lenght)

  {

    while (!(USARTC0.STATUS & USART_DREIF_bm));

    USARTC0.DATA = data[Counter];  

    Counter++;

  }

  Counter = 0x00;  

  while (!( USARTC0.STATUS & USART_DREIF_bm));

  USARTC0.DATA = 0x0A;  

  while (!( USARTC0.STATUS & USART_DREIF_bm));

  USARTC0.DATA = 0x0D;

}

ISR(TCC0_OVF_vect)

{

  TimerC0_Freq(0x85ED);  

  Send_UART("Hallo Welt!");

}