About the driver for the win7 host

[jun-takei1742]

Hello everyone, thank you for this great project.

I'm currently creating an STM32 uCNC to update the CNC on my homemade ISA board that I built a quarter century ago.
I've confirmed that the virtual COM port of the STM32 uCNC is recognized in win10 and that the motor works with UGS.
However, the virtual COM port is not recognized in win7 and "uCNC CDC" is displayed in the device manager as an unknown device.

My question is, is there any way to make it work properly in win7?

Thank you in advance.
This text was translated from Japanese to English using Google Translate.

[Paciente8159]

The problems seems to reside in the fact that Win7 and Win8.1usbser.sys class driver doesn't get installed automatically for devices belonging to the Communications Device Class (CDC), because Windows 7/8 lacks usbser.inf and possibly some other components, like explained here

Several things you can try:

• Try this modified ini based on the last option I listed here. I just changed the VID and ClassGUID to match the one I have on my PC. I'll attach a zip with the inf here. ucnc-tinyusb.zip
• Either try to install a generic CDC driver via Zadig
• You can try to install this one here. This is the same has I sent you above and was made to ESP32 TinyUSB version

[jun-takei1742]

Thank you for the information, Paciente8159.

I immediately tried 1 and 2 (because the inf file for 3 does not have the vendor ID "CAFE").
In conclusion, the virtual com port was recognized,
but when communication started, it started sending characters on its own and UGS stopped.
On win10, uCNC sends "OK" in response to enter,
but on win7 (32bit), it sends characters on its own.
1 and 2 are the same phenomenon.
I have attached an image of the terminal emulator.
I will also try it on another win7 (64bit) PC.
Thank you.

[jun-takei1742]

I tried method 1 on Win7 64bit.
The virtual COM port was recognized, and the terminal emulator returned OK in response to Enter, so everything seemed to work fine.
However, when I specified the virtual COM port in UGS and connected, the status alternated between connecting, idle, and hold, and characters were automatically displayed on the console, as shown in the attached image.

[Paciente8159]

That issue is explained here in the Wiki FAQ

Change EMULATE_GRBL_STARTUP to 2 in the cncc_config.h file