//这是一个单片机C51串口接收(中断)和发送例程,可以用来测试51单片机的中断接收 //和查询发送,另外我觉得发送没有必要用中断,因为程序的开销是一样
#include <reg52.h> #include <string.h>
#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); } }
}
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