usart1.c

不可多得的atmel公司canbus通讯程序（at90can128）

#define _USART1_H
#include "AT90CAN128.H"

uint8 rec_Buf[16];
uint8 volatile USART1_sendPosi =0;
uint8 volatile USART1_sendCount=0;

//UART1 initialize
// desired baud rate:9600
// actual baud rate:9615 (0.2%)
// char size: 8 bit
// parity: Disabled
void USART1_Init(void)
{
uint8 i;

 UCSR1B = 0x00; //disable while setting baud rate
 UCSR1A = 0x00;
 UCSR1C = 0x06;
 UBRR1L = 0x33; //set baud rate lo单片机内部晶振＝8M
 UBRR1H = 0x00; //set baud rate hi
 UCSR1B = (1 << TXEN1) | (1 << TXCIE1); 
}


void USART1_Begin_Send(void)
{
	USART1_sendCount = 16;
	USART1_sendPosi = 0;
   UDR1 = rec_Buf[USART1_sendPosi++];
}


#pragma interrupt_handler USART1_TX_ISR:iv_USART1_TX
void USART1_TX_ISR(void) 
{
	if (USART1_sendPosi < USART1_sendCount)
			UDR1 = rec_Buf[USART1_sendPosi++];
}