单片机c51串口中断接收和发送测试例程（含通信协议的实现）.htm

关于串口应用的很多方法及相关软件

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                  通信协议： 
                  第1字节，MSB为1，为第1字节标志，第2字节，MSB为0，为非第一字节标志，其余类推……，最后一个字节为前几个字节后7位的异或校验和。 

                  <P class=style27 align=left>　　测试方法：可以将串口调试助手的发送框写上 95 10 20 
                  25，并选上16进制发送，接收框选上16进制显示，如果每发送一次就接收到95 10 20 25，说明测试成功。 </P>
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                  <P class=style27 
                  align=left><STRONG>//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 
                  </STRONG><BR><STRONG>//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的 
                  </STRONG><BR><BR><BR><STRONG>#include </STRONG>&lt;reg51.h&gt; 
                  <BR><STRONG>#include </STRONG>&lt;string.h&gt; 
                  <BR><BR><STRONG>#define </STRONG>INBUF_LEN 4 <STRONG>//数据长度 
                  </STRONG><BR><BR><STRONG>unsigned char 
                  </STRONG>inbuf1[INBUF_LEN]; <BR><STRONG>unsigned char 
                  </STRONG>checksum,count3; <BR>bit read_flag= 0 ; 
                  <BR><BR><STRONG>void </STRONG>init_serialcomm( <STRONG>void 
                  </STRONG>) <BR>{ <BR>SCON = 0x50 ; <STRONG>//SCON: serail mode 
                  1, 8-bit UART, enable ucvr </STRONG><BR>TMOD |= 0x20 ; 
                  <STRONG>//TMOD: timer 1, mode 2, 8-bit reload 
                  </STRONG><BR>PCON |= 0x80 ; <STRONG>//SMOD=1; </STRONG><BR>TH1 
                  = 0xF4 ; <STRONG>//Baud:4800 fosc=11.0592MHz </STRONG><BR>IE 
                  |= 0x90 ; <STRONG>//Enable Serial Interrupt </STRONG><BR>TR1 = 
                  1 ; <STRONG>// timer 1 run </STRONG><BR><STRONG>// TI=1; 
                  </STRONG><BR>} <BR><BR><STRONG>//向串口发送一个字符 
                  </STRONG><BR><STRONG>void </STRONG>send_char_com( 
                  <STRONG>unsigned char </STRONG>ch) <BR>{ <BR>SBUF=ch; 
                  <BR><STRONG>while </STRONG>(TI== 0 ); <BR>TI= 0 ; <BR>} 
                  <BR><BR><STRONG>//向串口发送一个字符串，strlen为该字符串长度 
                  </STRONG><BR><STRONG>void </STRONG>send_string_com( 
                  <STRONG>unsigned char </STRONG>*str, <STRONG>unsigned int 
                  </STRONG>strlen) <BR>{ <BR><STRONG>unsigned int </STRONG>k= 0 
                  ; <BR><STRONG>do </STRONG><BR>{ <BR>send_char_com(*(str + k)); 
                  <BR>k++; <BR>} <STRONG>while </STRONG>(k &lt; strlen); <BR>} 
                  <BR><BR><BR><STRONG>//串口接收中断函数 </STRONG><BR><STRONG>void 
                  </STRONG>serial () interrupt 4 using 3 <BR>{ <BR><STRONG>if 
                  </STRONG>(RI) <BR>{ <BR><STRONG>unsigned char </STRONG>ch; 
                  <BR>RI = 0 ; <BR>ch=SBUF; <BR><STRONG>if </STRONG>(ch&gt; 127 
                  ) <BR>{ <BR>count3= 0 ; <BR>inbuf1[count3]=ch; <BR>checksum= 
                  ch- 128 ; <BR>} <BR><STRONG>else </STRONG><BR>{ <BR>count3++; 
                  <BR>inbuf1[count3]=ch; <BR>checksum ^= ch; <BR><STRONG>if 
                  </STRONG>( (count3==(INBUF_LEN- 1 )) &amp;&amp; (!checksum) ) 
                  <BR>{ <BR>read_flag= 1 ; 
                  <STRONG>//如果串口接收的数据达到INBUF_LEN个，且校验没错， 
                  </STRONG><BR><STRONG>//就置位取数标志 </STRONG><BR>} <BR>} <BR>} 
                  <BR>} <BR><BR><BR>main() <BR>{ <BR>init_serialcomm(); 
                  <STRONG>//初始化串口 </STRONG><BR><STRONG>while </STRONG>( 1 ) 
                  <BR>{ <BR><STRONG>if </STRONG>(read_flag) 
                  <STRONG>//如果取数标志已置位，就将读到的数从串口发出 </STRONG><BR>{ <BR>read_flag= 
                  0 ; <STRONG>//取数标志清0 
                  </STRONG><BR>send_string_com(inbuf1,INBUF_LEN); <BR>} <BR>} 
                  <BR><BR>} <BR><BR></P></TD></TR>
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