Proteus AVR例子

				#define USART_C
				#include "includes.h"
				int usart_putchar(char c)
				{
					if (c == '\n')
						usart_putchar('\r');
					while(UCSRA&(1					//loop_until_bit_is_set(UCSRA, UDRE);
					UDR = c;
					return 0;
				
				}
				
				void init_usart(void)
				{
					// USART initialization
					// Communication Parameters: 8 Data, 1 Stop, No Parity
					// USART Receiver: Off
					// USART Transmitter: On
					// USART Mode: Asynchronous
					// USART Baud rate: 19200
					UCSRA=0x00;
					UCSRB=0x08;
					UCSRC=0x86;
					UBRRH=0x00;
					UBRRL=0x0C;
					
					//fdevopen(usart_putchar, NULL, 0);
				}