CDC Device descriptior request failed

[Treacy Yao]

I want to realize CDC function to transimit/receive data to/from PC via STM32F105RB. I get the code from Cube. Set clock, enable CDC and modify heap size to 0x1000. But when I power on deivce, "Device descriptior request failed" shown.

1.I don't know where is the problem.

2.By the way, For the PC driver, "Starting from windows 10, the STSW-STM32102 driver is no more adequate and the usage of the native inbox driver is recommanded", I don't konw where can get native inbox drive? This is mean I don't need to install driver in WIN10. Now I'm using win10 to do the testing.

3.I also tired WIN7(32bit), still have the "Device descriptior request failed" problem.

Please help me.

[Tesla DeLorean]

Is this on known working hardware?

In BOOT0=HIGH, can you see up a STM32 USB DFU device?

I'm not looking to wade through 18MB of someone else's Cube project. You'll need to debug your own work. Instrument functionality to you can see/understand what is happening.

[asbjorn.heid · Accepted solution]

Did you implement CDC_Control_FS handling? See my post in https://community.st.com/s/question/0D50X0000A4nieqSQA/how-to-implement-usb-cdc

[asbjorn.heid]

And regarding 2) yes, Windows 10 has built-in driver, so no need to install.

[Treacy Yao]

Thank you for your response. I have tried as you said and still have the "Device descriptior request failed" in WIN10. I attach my files. Please have a check.

I doubt maybe it is hardware problem, but How can I confirm with oscilloscope? I'm the green hand for USB.

[Treacy Yao]

Could you please have a check my code?

[asbjorn.heid]

I don't have your mcu, so I've copied your code to an empty STM32F103 project. I've managed to reproduce the error, and tried comparing it with my successful code. I've not yet found any differences that could explain it, but I'll have a closer look tonight.

[Trevor Jones]

I fixed this issue yesterday...

the crystal was set to bypass clock, so it used the internal 48MHz and half worked...

Do you have a crystal ? check the frequency on the scope.. it has to be correct in the cube...

[Treacy Yao]

Please, this fucntion have taken a long time. Thank you.

[Treacy Yao]

I selected Crystal/Ceramic ReSonatar for HSI and LSE. Do you mean let me try to select BYPASS clock for  HSI and LSE?