Cdc serial port4/4/2024 If I call CreateHandle manually, and skip any calls to SetCommState(…), then I can access the PC end of the CDC port successfully, but that requires that I use PInvoke calls to talk to the serial port. In debugging it a bit, I have found that calls to Win32 SetCommState(…) fails for CDC USB devices, and that causes the. The same code works for pretty much every other serial USB device (FTDI, etc), but not a CDC device. Var port = new SerialPort("COM5", 9600, Parity.None, 8, StopBits.One) Īnd the port.Open() in the PC side of the conversation reliably fails with System.InvalidOperation. Net Framework console program running on the PC: using System It opens the port and just sends Hello World repeatedly (resetting the port if it fails) : using System ĭebug.Print(Resources.GetString(1)) īyte bytes = 8.GetBytes("Hello world!\r\n") ĭebug.Print("Waiting to connect to PC.") I have a CDC test program (netmf 4.3, GHI 4.3.7.10) as shown below.
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