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我以前写的
参考一下
#include
#include
#define INBUF_LEN 4//数据长度
//xdata unsigned char inbuf1[INBUF_LEN];
unsigned char inbuf1[INBUF_LEN]={0x23,0x45,0x26,0x57};
unsigned char checksum,count3;
bit read_flag= 0 ;
void init_serialcomm( void )
{
SCON = 0x50 ; //SCON: serail mode 1, 8-bit UART, enable ucvr 字串8
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);
}
//字串2
//串口接收中断函数
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 ; //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
{ //字串4
read_flag= 0 ; //取数标志清0
send_string_com(inbuf1,INBUF_LEN);
}
}
}
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