IAR For AVR 串口中断接收

应用芯片： AT Mega16               晶振： 7.3728MHz      

代码文件： uart_int.c

                         |_________DELAY.H

##############################################

DELAY.H ：

#ifndef __IAR_DELAY_H
#define __IAR_DELAY_H

#include

#define XTAL 7.3728                    //可定义为你所用的晶振频率（单位Mhz）

#define delay_us(x) __delay_cycles ( (unsigned long)(x * XTAL) ) 
#define delay_ms(x) __delay_cycles ( (unsigned long)(x * XTAL*1000) )
#define delay_s(x) __delay_cycles ( (unsigned long)(x * XTAL*1000000) )

#endif

 

uart_int.c ：

#include
#include 'delay.h'
#define uchar unsigned char 
#define uint unsigned int

uchar c;

//###########################################################
/*串口初始化函数*/
void Uart_Init(void)
{                         
    UCSRB = (1<     UCSRC = (1<

    UBRRH=0x00;                                                             //设置波特率寄存器低位字节
    UBRRL=47;                                                                   //9600    //设置波特率寄存器高位字节 
    
    SREG_I = 1;                                                                //开总中断
    DDRD_Bit1=1;                                                             //配置TX为输出（很重要）
}
//###########################################################
/*发送一个字符数据，查询方式*/
void Uart_Transmit(uchar data)
{
     while(!(UCSRA&(1<                                                                                          //也可以写成 while(UCSRA_UDRE==0);   
     UDR = data;                                                               // 发送数据
}
//###########################################################
/*中断接收*/
#pragma vector=USART_RXC_vect 
__interrupt void USART_RXC_Server(void) 
{ 
UCSRB_RXCIE = 0;                                                        //关串口中断
c = UDR ;                                                                       //将收到的值赋值给变量
Uart_Transmit(c);                                                          //发给串口以检测对错
UCSRB_RXCIE = 1;                                                         //开串口中断
} 
//###########################################################
/*主函数*/ 
void main(void)
{
Uart_Init();
delay_us(20);                       //串口初始化后，必须延时20us以上才能发送数据，否则会出现错误
Uart_Transmit(0x64);

while(1)
{ ; }                                        //此时可以用串口助手发送字符，然后可以正确接收
}