#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 { read_flag= 0 ; //取数标志清 0 send_string_com(inbuf1,INBUF_LEN); } } }