UART-USB Gateway auf dem AVR Xplained A1

#include "usart.h"

#define USART USARTC0

#define USART_SERIAL_EXAMPLE             &USARTC0

#define USART_SERIAL_EXAMPLE_BAUDRATE    57600

#define USART_SERIAL_CHAR_LENGTH         USART_CHSIZE_8BIT_gc

#define USART_SERIAL_PARITY              USART_PMODE_DISABLED_gc

#define USART_SERIAL_STOP_BIT            false

// USART options.

static usart_rs232_options_t USART_SERIAL_OPTIONS = {

  .baudrate = USART_SERIAL_EXAMPLE_BAUDRATE,

  .charlength = USART_SERIAL_CHAR_LENGTH,

  .paritytype = USART_SERIAL_PARITY,

  .stopbits = USART_SERIAL_STOP_BIT

  };

// serial output

static void uart_put(char c) {

    while( (USART.STATUS & USART_DREIF_bm) == 0 ) {}

    // Now transmit the character

    USART.DATA = c;      

}

//serial output

char conin(void) {

 while((USART.STATUS & USART_RXCIF_bm) == 0 ){};

 return USART.DATA;  

}

int main (void)

{

   sysclk_enable_peripheral_clock(&USARTC0);  

   sysclk_enable_module(SYSCLK_PORT_C, PR_USART0_bm);

// ASF takes care of configuing the port pins

   usart_init_rs232(USART_SERIAL_EXAMPLE, &USART_SERIAL_OPTIONS);

// more in main.......

}