嵌入式开发AVR下的串口源码

#include <io8535v.h> #define uchar unsigned char #define uint unsigned int uchar Table[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; uchar Send_Data[]={'a','b','c','d'}; uchar Receive_Data[]={0,0,0,0}; void DelayMs(uint i) {uint j; for(;i!=0;i--) {for(j=2000;j!=0;j--) {;}} } void Display(uchar *p) //动态显示函数，参数p为待显示的数组名 {uchar i,sel=0x01; for(i=0;i<4;i++) {PORTA=sel; //选通最右边的数码管 PORTC=0xff-Table[p[i]]; //送字型码 DelayMs(1); //显示延时 sel=sel<<1; //移位以显示前一位 } } void main(void) {uchar temp,i; DDRA=0xff; DDRC=0xff; PORTA=0xff; PORTC=0x00; DelayMs(2000); PORTC=0xff; UBRR=51;//9600bps,8.000M, UCR=0x18;//RXD.TXD使能； for(i=0;i<4;i++) { while(!(USR & 0x80)) { Display(Receive_Data); } //等待接收完成 Receive_Data[i]=UDR-48; } //接收数据 for(i=0;i<4;i++) { while(!(USR&0x20)) { Display(Receive_Data); } //等待移位寄存器空； UDR=Send_Data[i]; } while(1) Display(Receive_Data); }