General discussion • Re: USB application

Code:

In /boot or /boot/firmwareAdd to config.txt  dtoverlay=dwc2Add to cmdline.txt  modules-load=g_serialCreates a serial port file:   /dev/ttyGS0C code:  instream = fopen("/dev/ttyGS0","r");  outstream = fopen("/dev/ttyGS0","w");    fread(....,instream);  fwrite(....,outstream);  

Code:

  HANDLE hCom;  COMMTIMEOUTS cto;  BOOL retval;  int comport,nread,nwrit,count;  unsigned char buf[16];  static char serport[16] = {"\\\\.\\COMxx"};  // sets to  \\.\COMxx     // set up client with COM port number = comport  comport = 3;    // for example COM3     // replace xx in serport[] with COM port number  if(comport < 10)    {    serport[7] = (char)(comport + '0');    serport[8] = 0;    }  else    {    serport[7] = (char)((comport/10) + '0');    serport[8] = (char)((comport%10) + '0');    serport[9] = 0;    }      // CreateFile connects to Pi  hCom = CreateFile( serport,    GENERIC_READ | GENERIC_WRITE,    0,    // exclusive-access    NULL, // no security attributes    OPEN_EXISTING,    0,     // 0=not overlapped I/O  or FILE_FLAG_OVERLAPPED    NULL   // hTemplate    );   if(hCom == INVALID_HANDLE_VALUE)      // CreateFile error    return(0);       // set time outs  cto.ReadIntervalTimeout = 5;  cto.ReadTotalTimeoutMultiplier=5;  cto.ReadTotalTimeoutConstant=5;  cto.WriteTotalTimeoutMultiplier=5;  cto.WriteTotalTimeoutConstant=5;  SetCommTimeouts(hCom,&cto);    // hCom is now an open connection to Pi    // Read/write serial data  ReadFile(hCom,buf,count,&nread,NULL);  WriteFile(hCom,buf,count,&nwrit,NULL);      // disconnect  CloseHandle(hCom);