The STM32 USB device library feels complicated

[Shiina]

The structure of the stm32 usb device library feels very complex, is there any tutorial to clarify the structure?

I want to implement a UVC.

This is a picture I found on a wiki, but I can't make sense of it.

For example, the file stm32xxx_ll_usb has no LL for the API name, but the USB core has LL for the API name, which is very confusing, and PCD HAL driver The name doesn't tell you what it does.

If the following structure is better applied

[Imen.D]

Hello @Shiina ,

I recommend you refer to the following document: UM1734: STM32Cube™ USB device library.

[Andrew Neil]

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@Shiina wrote:

The structure of the stm32 usb device library feels very complex,

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well, USB itself is quite complex!

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@Shiina wrote:

This is a picture I found on a wiki

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What Wiki? please give a link

[gbm]

My impression is that STM USB stack with tangled pointers and bidirectional function calls between logical levels is much more complex than USB. ;)

[Shiina]

https://wiki.stmicroelectronics.cn/stm32mcu/wiki/Category:USB

[FBL]

Hi @Shiina 

Capturing USB traffic is an excellent recommendation! Correlate the captured USB traffic with your code to understand how specific operations in your code translate to USB packets.