2025-07-23 9:01 PM
Hi everyone,
I'm currently working on a project to turn an STM32 microcontroller into a USB printer
device. I have spent a considerable amount of time searching for a comprehensive guide
or a complete implementation for the classic USB printer device class on the STM32
platform, but unfortunately, I haven't found a solution yet.
I did find this valuable ST Community post that provides a walkthrough for setting up a
USB Communications Device Class (CDC): LINK, This has led me to a few specific questions:
1. CDC vs. Printer Class: For those experienced with both, how significant is the
development effort to move from a CDC implementation to a compliant USB Printer
Class (Class Code 07h) device? I understand the Printer Class has its own set
of specifications, but I'm trying to gauge the complexity of adapting the existing
CDC examples.
2. Successful Implementations: Has anyone in the community successfully configured
an STM32 as a USB printer device? I've come across a few forum posts where this has
been discussed, but a complete, documented project seems to be elusive.
3. Official Support & Future Tutorials: Given the utility of a USB printer device,
is there any information on whether STMicroelectronics plans to release an official
tutorial or an application note for the printer class, similar to what's available for
CDC and other classes?
I'm finding a surprising lack of published resources on this topic, which is frustrating
because the ability to emulate a printer would be a major selling point for many
applications. Any advice, pointers to existing projects, or even a confirmation
that I'm not alone in this struggle would be greatly appreciated!
Thanks in advance for your help.
2025-07-23 11:23 PM
You may have a look at my USB stuff here:
https://github.com/gbm-ii/gbmUSBdevice
It's not based on the official ST software but you may easily see what's needed to implement USB printer functionality.