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📁 c 语言实现串口通信.转载别人的看不懂
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<P>　　}while(G1/16!=32);</P>
<P>　　printf("File name transmit finished.\n");</P>
<P>　　}</P>
<P>　　void InitPort(port,para)</P>
<P>　　int port;</P>
<P>　　unsigned char para;</P>
<P>　　{</P>
<P>　　union REGS reg;</P>
<P>　　reg.x.dx=port;</P>
<P>　　reg.h.ah=0;</P>
<P>　　reg.h.al=para;</P>
<P>　　int86(0x14,&reg;,&reg;);</P>
<P>　　}</P>
<P>　　void SendPort(port,c)</P>
<P>　　int port;</P>
<P>　　char c;</P>
<P>　　{</P>
<P>　　union REGS reg;</P>
<P>　　reg.x.dx=port;</P>
<P>　　reg.h.al=c;</P>
<P>　　reg.h.ah=1;</P>
<P>　　int86(0x14,&reg;,&reg;);</P>
<P>　　if(reg.h.ah&amp;128){</P>
<P>　　printf("\nSend mistakes!");</P>
<P>　　exit(1);</P>
<P>　　}</P>
<P>　　}</P>
<P>　　int ReadPort(port)</P>
<P>　　int port;</P>
<P>　　{</P>
<P>　　union REGS reg;</P>
<P>　　while(!(CheckState(port)&amp;256)){</P>
<P>　　if(kbhit()){/*如端口长期无数据可人为终止等待*/</P>
<P>　　printf("Press any key to exit.");</P>
<P>　　getch();</P>
<P>　　exit(1);</P>
<P>　　}</P>
<P>　　}</P>
<P>　　reg.x.dx=port;</P>
<P>　　reg.h.ah=2;</P>
<P>　　int86(0x14,&reg;,&reg;);</P>
<P>　　if(reg.h.ah&amp;128){</P>
<P>　　printf("\nRead mistake!");</P>
<P>　　exit(1);</P>
<P>　　}</P>
<P>　　return reg.h.al;</P>
<P>　　}</P>
<P>　　int CheckState(port)</P>
<P>　　int port;</P>
<P>　　{</P>
<P>　　union REGS reg;</P>
<P>　　reg.x.dx=port;</P>
<P>　　reg.h.ah=3;</P>
<P>　　int86(0x14,&reg;,&reg;);</P>
<P>　　return reg.x.ax;</P>
<P>　　}</P>
<P>　　以上程序可传送各种格式的文件，也有一定的自动纠错能力，但对于异常情况的处理能力比较弱，读者可以自己改进。由于篇幅限制，对于中断14H的功能、入口参数及返回参数的意义请读者自己查有关资料。</P>
<P>　　**********************************</P>
<P>　　附录:</P>
<P>　　现在大多数串行口都遵循RS-232标准，以下是最常用的RS-232信号:</P>
<P>　　名称 针号 含义</P>
<P>　　RTS　4　　Request to send(请求发送)</P>
<P>　　CTS　5　　Clear to send(清除发送)</P>
<P>　　DSR　6　　Data set ready(数据设备准备好)</P>
<P>　　DTR　20 　Data terminal ready(数据终端准备好)</P>
<P>　　TXD　2　　Transmit data(发送数据)</P>
<P>　　RXD　3　　Receive data(接收数据)</P>
<P>　　GRD　7　　Ground(接地)</P><BR>&nbsp;&nbsp;阅读关于 <A 
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