c语言异步读写串口,异步串口uart的c语言编程

#include

#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);   }