c51#.txt

C51单片机串行口中断服务程序2,is used

 
            #include <reg51.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);  
            }  
            }  
            }