Windows 10: Issue with RTS control via usbser.sys

I am trying to control RTS signal on my USB-UART device on Windows 10 and found that the usbser.sys driver does not generate any USB SET_CONTROL_LINE_STATE requests for EscapeCommFunctionhndl, SETRTS or EscapeCommFunctionhndl, CLRRTS calls as expected. As results, RST signal is being unchanged on UART device.





My example is based on https://docs.microsoft.com/en-us/windows/win32/devio/configuring-a-communications-resource as following:





<code>


#include <windows.h>


#include <tchar.h>


#include <stdio.h>





int _tmainint argc, TCHAR* argv[]


{


DCB dcb;


HANDLE hCom;


BOOL fSuccess;


TCHAR *pcCommPort = TCHAR*TEXT"COM9";





// Open a handle to the specified com port.


hCom = CreateFilepcCommPort,


GENERIC_READ GENERIC_WRITE,


0, // must be opened with exclusive-access


NULL, // default security attributes


OPEN_EXISTING, // must use OPEN_EXISTING


0, // not overlapped I/O


NULL; // hTemplate must be NULL for comm devices





if hCom == INVALID_HANDLE_VALUE


{


// Handle the error.


printf"CreateFile failed with error %d.\n", GetLastError;


return 1;


}





// Initialize the DCB structure.


SecureZeroMemory&dcb, sizeofDCB;


dcb.DCBlength = sizeofDCB;





// Build on the current configuration by first retrieving all current


// settings.





fSuccess = GetCommStatehCom, &dcb;





if !fSuccess


{


// Handle the error.


printf"GetCommState failed with error %d.\n", GetLastError;


return 2;


}





// Fill in some DCB values and set the com state:


// 115,200 bps, 8 data bits, no parity, and 1 stop bit.


dcb.BaudRate = CBR_115200; // baud rate


dcb.ByteSize = 8; // data size, xmit and rcv


dcb.Parity = NOPARITY; // parity bit


dcb.StopBits = ONESTOPBIT; // stop bit


dcb.fDtrControl = DTR_CONTROL_DISABLE;


dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;





fSuccess = SetCommStatehCom, &dcb;





if !fSuccess


{


// Handle the error.


printf"SetCommState failed with error %d.\n", GetLastError;


return 3;


}





// Set RTS


fSuccess = EscapeCommFunctionhCom, SETRTS; // SET_CONTROL_LINE_STATE request is expected here on the USB bus, but nothing happens.





if !fSuccess


{


// Handle the error.


printf"GetCommState failed with error %d.\n", GetLastError;


return 2;


}





_tprintfTEXT"RTS is set\n";





Sleep1000; // Sleep for one second





// Clear RTS





fSuccess = EscapeCommFunctionhCom, CLRRTS; // SET_CONTROL_LINE_STATE request is expected here on the USB bus, but nothing happens.





if !fSuccess


{


// Handle the error.


printf"GetCommState failed with error %d.\n", GetLastError;


return 2;


}





_tprintfTEXT"RTS is clear\n";





Sleep1000; // Sleep for one second





_tprintfTEXT"Serial port %s successfully reconfigured.\n", pcCommPort;





return 0;


}





</code>





Expected Result: After EscapeCommFunctionhndl, SETRTS or EscapeCommFunctionhndl, CLRRTS calls on the USB bus, SET_CONTROL_LINE_STATE request appears which reflects the RTS change.





Actual Result: After EscapeCommFunctionhndl, SETRTS or EscapeCommFunctionhndl, CLRRTS calls, no SET_CONTROL_LINE_STATE request appears on the USB bus at all. As results, RST signal is being unchanged on UART device. Note: that RST can be changed if enforce the updating DTR signal right after that.


A similar question was asked several years ago, but there was not answered:
https://answers.microsoft.com/en-us/windows/forum/all/virtual-serial-port-usbsersys-is-not-sending/a086cbf6-2d0a-4c46-88fd-73865bc185f5


Could you please clarify whether this is an expected behavior of usbser.sys?





Thanks,


Marian


:)

 

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Hi Nezar,

Thank you for posting on Microsoft Communities.

I will be glad to help you with the issue you have with the computer. I understand the frustration when things don't work the way it should.

What is the make and model of your computer?

File igdkmd64.sys is the Intel Graphics Kernel Mode Driver for Microsoft Windows 8.

I would suggest you to follow the steps provided below:



Step 1:

Uninstall the Device from Device Manager

• Open Device Manager
• Expand the Display Adapter section.
  
• Find the Display card Driver.
• Right click Display card Driver and select
  Uninstall.
• Select the check box delete the driver software for this device.
• Reboot the computer after uninstall process has finished.

Step 2:

Uninstall the Device Drivers from Program List in Control Panel

• Click on start, select Control Panel
• Now click on Programs and select Programs and Features.
• Find the Display card Driver.
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• Reboot the computer after the uninstall process has finished.

Hope this helps and do let us know if you need any assistance.