面就是用C语言编写控制串行口的程序

面就是用C语言编写控制串行口的程序。#includedos.h#includestdlib.h#includestdio.h#definePORT0voidSendFile(char*fname);/*发送文件*/voidSend(ints);/*发送一个字节*/voidSendFileName(char*fname);/*发送文件名*/voidReceiveFile();/*接收文件*/voidGetFileName(char*f);/*接收文件名*/voidInitPort(intport,unsignedcharpara);/*初始化端口*/voidSendPort(intport,charc);/*端口发送*/intReadPort(intport);/*读端口字节*/intCheckState(intport);/*检查端口状态*/intReceive(intport,int*G);/*接收一个字节*/main(intargc,char*argv[]){if(argc2){printf(PleaseinputR(receive)orS(sent)parametre:);exit(1);}InitPort(PORT,231);if(*argv[1]==''''S'''')/*检查选择的有效性*/SendFile(argv[2]);elseif(*argv[1]==''''R'''')ReceiveFile();else{printf(Errorparament.Pleaseinputagain.);exit(1);}}voidSendFile(char*fname){FILE*fp;intch,s;if((fp=fopen(fname,rb))==NULL){printf(Can''''topenthefile.\n);exit(1);}SendFileName(fname);do{ch=(int)getc(fp);if(ferror(fp)){printf(Errorreadingfile.\n);break;}s=ch%16;/*取文件中一个字节的低4位*/Send(s);s=ch/16;/*取文件中一个字节的高4位*/Send(s);}while(!feof(fp));s=46;/*发送文件结束信息*/Send(s);Send(s);fclose(fp);}voidSend(s)ints;{intG;SendPort(PORT,s);G=ReadPort(PORT);/*等待握手信号*/if(s!=G)s=s+16;do{SendPort(PORT,s);G=ReadPort(PORT);/*等待握手信号*/}while(s!=G);}voidSendFileName(fname)char*fname;{ints,ch;printf(Nowtransmitthefile.Pleasewait...);while(*fname){ch=(int)fname++;s=ch%16;/*取文件名中一个字节的低4位*/Send(s);s=ch/16;Send(s);/*取文件名中一个字节的低4位*/}s=32;/*发送文件名结束标志*/Send(s);Send(s);}voidReceiveFile(){FILE*fp;charch;intG1,G2,G3;charfname[15];GetFileName(fname);printf(Receivingfile%s.\n,fname);remove(fname);if((fp=fopen(fname,wb))==NULL){printf(Can''''topenoutputfile.\n);exit(1);}/*循环为检测每次接受的数据是否为新数据，如果不是，*//*则用此次接收的数据覆盖上次接收的数据*/G1=ReadPort(PORT);G2=Receive(PORT,&G1);do{G3=Receive(PORT,&G2);ch=(char)(G1%16+G2*16);/*恢复分开的数据，组合高4位和低4位*/putc(ch,fp);if(ferror(fp)){printf(\nErrorwritingfile.);exit(1);}G2=Receive(PORT,&G3);G1=G3;}while(G1/16!=48);printf(\nTransmitfinished.);fclose(fp);}intReceive(port,G)intport,*G;{intGM;SendPort(port,*G);GM=ReadPort(port);if(GM/16==0)returnGM;elseif(GM/16==1){do{*G=GM;SendPort(port,GM);GM=ReadPort(port);}while(GM/16==1);}returnGM;}voidGetFileName(char*f){intG1,G2,G3;charch;G1=ReadPort(PORT);G2=ReadPort(PORT);do{G3=Receive(PORT,&G3);ch=(char)(G1%16+G2/16);*f=ch;*f++;G2=Receive(PORT,&G3);G1=G3;}while(G1/16!=32);printf(Filenametransmitfinished.\n);}voidInitPort(port,para)intport;unsignedcharpara;{unionREGSreg;reg.x.dx=port;reg.h.ah=0;reg.h.al=para;int86(0x14,®,®);}voidSendPort(port,c)intport;charc;{unionREGSreg;reg.x.dx=port;reg.h.al=c;reg.h.ah=1;int86(0x14,®,®);if(reg.h.ah&128){printf(\nSendmistakes!);exit(1);}}intReadPort(port)intport;{unionREGSreg;while(!(CheckState(port)&256)){if(kbhit()){/*如端口长期无数据可人为终止等待*/printf(Pressanykeytoexit.);getch();exit(1);}}reg.x.dx=port;reg.h.ah=2;int86(0x14,®,®);if(reg.h.ah&128){printf(\nReadmistake!);exit(1);}returnreg.h.al;}intCheckState(port)intport;{unionREGSreg;reg.x.dx=port;reg.h.ah=3;int86(0x14,®,®);returnreg.x.ax;}