#include<reg51.h>
#include<string.h>
#defineINBUF_LEN4//数据长度
unsignedcharinbuf1[INBUF_LEN];
unsignedcharchecksum,count3;
bit read_flag=0;
voidinit_serialcomm(void)
{
SCON =0x50;//SCON: serail mode 1, 8-bit UART, enable ucvr
TMOD |=0x20;//TMOD: timer 1, mode 2, 8-bit reload
PCON |=0x80;//SMOD=1;
TH1 =0xF4;//Baud:4800 fosc=11.0592MHz
IE |=0x90;//Enable Serial Interrupt
TR1 =1;// timer 1 run
// TI=1;
}
//向串口发送一个字符
voidsend_char_com(unsignedcharch)
{
SBUF=ch;
while(TI==0);
TI=0;
}
//向串口发送一个字符串，strlen为该字符串长度
voidsend_string_com(unsignedchar*str,unsignedintstrlen)
{
unsignedintk=0;
do
{
send_char_com(*(str + k));
k++;
}while(k < strlen);
}
//串口接收中断函数
voidserial () interrupt4using3
{
if(RI)
{
unsignedcharch;
RI =0;
ch=SBUF;
if(ch>127)
{
count3=0;
inbuf1[count3]=ch;
checksum= ch-128;
}
else
{
count3++;
inbuf1[count3]=ch;
checksum ^= ch;
if( (count3==(INBUF_LEN-1)) && (!checksum) )
{
read_flag=1;//如果串口接收的数据达到INBUF_LEN个，且校验没错，
//就置位取数标志
}
}
}
}
main()
{
init_serialcomm();//初始化串口
while(1)
{
if(read_flag)//如果取数标志已置位，就将读到的数从串口发出
{
read_flag=0;//取数标志清0
send_string_com(inbuf1,INBUF_LEN);
}
}
}