I can't use Polymath LP-805 due to an error.

Question

"Open COM port (in the header)
 Can't find CP2101 port."

Answer 1

HANDLE hMasterCOM = CreateFile("\\\\.\\COMnumber",
                      GENERIC_READ | GENERIC_WRITE,
                      0,
                      0,
                      OPEN_EXISTING,
                      FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
                      0);