单片机C51串口接纳（中止）和发送例程

//这是一个单片机C51串口接纳（中止）和发送例程，能够用来测验51单片机的中止接纳

//和查询发送，别的我觉得发送没有必要用中止，由于程序的开支是相同

#include
#include

#define INBUF_LEN 4 //数据长度

unsigned char inbuf1[INBUF_LEN];
unsigned char checksum,count3;
bit read_flag=0;

void init_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
void send_char_com(unsigned char ch)
{
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
void send_string_com(unsigned char *str,unsigned int strlen)
{
unsigned int k=0;
do
{
send_char_com(*(str + k));
k++;
} while(k < strlen);
}

//串口接纳中止函数
void serial () interrupt 4 using 3
{
if(RI)
{
unsigned char ch;
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; //假如串口接纳的数据到达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) //假如取数标志已置位，就将读到的数从串口宣布
{
read_flag=0; //取数标志清0
send_string_com(inbuf1,INBUF_LEN);
}
}

}