Problem with Tang Nano 20K version 3923

[jcubedo]

I have managed to make version 3921 work but with this one it is impossible for me.
Does not detect any USB device.

Also I tried with an external M0S Dock and the same results.

[vossstef]

@jcubedo unfortunately i don't have that model. There is also no circuit diagram available here: https://api.dl.sipeed.com/shareURL/TANG/Nano_20K/2_Schematic
Need to ask Caeser what is this obvious new release all about

[vossstef]

@jcubedo i was so far not able to get in contact with Caesar / zepan (caize wu) to get information. Can you maybe take a detail photo of the bl616 mpu and post that? would like to check if they changed the MPU...

[harbaum]

Does it provide power to the USB? Many recent Tang boards don't.

[jcubedo]

This isn,t the problem, because i tried to power dirctly the board

[vossstef]

@jcubedo guess the question was is your USB HID device powerd by a power deliver capable hub ?
I am wondering what had been changed on that new board ? Is that circuit or also MPU

[jcubedo]

Sorry, I’m in a travel. I’ll be full in two days.
But, I tried with three hubs with power deliver.
The three are ok in another board version 3921

[vossstef]

@jcubedo any chance that you upload a photo of the mcu ? Guess it should be bl616 but who knows...

[jcubedo]

I`m not at home, but the board works with the M0S Dock and the project NextNano for bl616.

[jcubedo]

RetroSilicon in the NextNano project has compiled a new version that works on that board.

This is the link:

RetroSilicon/NextNano#4 (comment)