51单片机与串口通信代码

串口调试
1. 发送：向总线上发敕令
2. 领受：除夜总线领受敕令，并理会是地址照样数据。
3. 准时发送：除夜内存中取数并向主机发送.
＃i nclude <reg51.h>
＃i nclude<stdio.h>
＃i nclude <string.h>
#define INBUF_LEN 4 //数据长度
unsigned char inbuf1[INBUF_LEN];
unsigned char checksum,count3 , flag,temp,ch;
bit read_flag=0;
sbit cp=P1^1;
sbit DIR=P1^2;
int i;
unsigned int xdata *RAMDATA; /*定义RAM地址指针*/
unsigned char a[6] ={0x11,0x22,0x33,0x44,0x55,0x66} ;
void init_serialcomm(void)
{
SCON=0x50; //在11.0592MHz下，设置串行口波特率为9600，体式技俩1,并准许领受
PCON=0x00;
ES=1;
TMOD=0x21; //准时器工作于体式技俩2，主动装载体式技俩
TH0=(65536-1000)%256;
TL0=(65536-1000)/256;
TL1=0xfd;
TH1=0xfd;
ET0=1;
TR0=1;
TR1=1;
// TI=0;
EA=1;
// TI=1;
RAMDATA=http://www.elecfans.com/article/87/82/2010/0x1F45;
}
void serial () interrupt 4 using 3
{
if(RI)
{ RI=0;
ch=SBUF;
TI=1; //置SBUF空
switch(ch)
{
case 0x01 :printf("A"); TI=0;break;
case 0x02 :printf("B"); TI=0;break;
case 0x03 :printf("C"); TI=0;break;
case 0x04 :printf("D"); TI=0;break;
default :printf("fg"); TI=0;break;
}
}
}
//向串口发送一个字符
void timer0() interrupt 1 using 3{
// char i;
flag++;
TH0=0x00;
TL0=0x00;
if(flag==10)
{// cp=!cp;
// for(i=0;i<6;i++)
P2=0x25;
TI=1;
temp=*RAMDATA;
printf("%c",temp);
TI=0;
// RAMDATA--;
flag=0;
}
}

//主法度
main()
{
init_serialcomm(); //初始化串口
//向6264中送数据
{
*RAMDATA=http://www.elecfans.com/article/87/82/2010/0x33;

}

while(1)
{

*RAMDATA=http://www.elecfans.com/article/87/82/2010/0x33;;
}
}