main._c

avr icc开发的avr单片机与pc机vb通讯控制程序

#define MAIN_C
#include "includes.h"
/***************************/
/*串口通信*/
/*晶振为4MHz*/
/*波特率为9600bps*/
/*发送采用查询方式，接收采用中断方式*/
/*当收到的字符达到所定义的长度时，则在LCD上显示收到的字符*/
/***************************/
#define BufSize 10
unsigned char RsBuf[BufSize];  //定义接收缓冲器
int RsBytes = 0;
unsigned char flag = 0;
void main(void)
{
    unsigned char *msg = "Usart Test!\n";    
    SREG |= (1<<7);  //使能全局中断
    UsartInit();
    Init_LCD();
    SendNbyte(msg,12);
    PutStr("Test Ok\n");   
    LCD_DisplayString(1,1,"Usart Test!");
    delay_nms(2000);
    LCD_Clear();
    LCD_DisplayString(1,1,"Recive is :");    
    while(1)
    {
        if(flag)
        {
           PutStr(RsBuf);
		  PORTA =UDR-0x30 ;
          DDRA  = 0xff;
           LCD_DisplayString(2,1,RsBuf);           
           PutChar('\n');
           flag = 0;
        }
    }
}

//接收中断子程序  



#pragma interrupt_handler uart0_rx_isr:12
void uart0_rx_isr(void)
{
 //uart has received a character in UDR
  RsBuf[RsBytes] = UDR;
    RsBytes ++;
   // PutChar(RsBuf[RsBytes]); //回显
    if(RsBytes >= BufSize)
    {   
        flag = 1;
        RsBytes = 0;
    }
}