USB Mass Storage bridge to monitor USB traffic

[SSune.1]

Hi

I have stm32f446re nucleo. Is it possible to make one USB traffic monitoring bridge using it?

(USB Storage or SDCard) <-----STM32-----> Computer

I am trying to do is to make one monitor to see what content is getting accessed from the computer from the mass storage or sd card etc.

Can someone guide on this?

[Tesla DeLorean]

If you implement a USB MSC device you can see the SCSI READ/WRITE transactions as you perform them against SDRAM, or SDIO/SDMMC storage medium.

[SSune.1]

Is there any sample available. that will be helpful

[Tesla DeLorean]

The CubeF4 trees have several MSC and SDIO examples for DISCO and EVAL boards that should port. Review those.

[SSune.1]

Thank you. I ll try

[Tesla DeLorean]

STM32Cube_FW_F4_V1.25.0\Projects\STM32446E_EVAL\Applications\USB_Device\MSC_Standalone\readme.txt

[SSune.1]

umm I don't know how to port. I'm very biginner in embedded. ​

[SSune.1]

thanks. I'll check this source code 🙂🙂​

[SSune.1]

Hi Clive

I tried one example to make a mass storage device using SRAM, got it from ST's tutorial for USB MSC.

I am having nucleo 446RE. I followed the same approach to make 64kb mass storage, I can see the device is attached to system as mass storage

but Is says "Device is not started: USBSTOR"

Device USB\VID_0483&PID_5727\307533543038 was not migrated due to partial or ambiguous match.

What could be solution for this?

[Tesla DeLorean]

I suspect this would be an issue with READ or GET CAPACITY functionality provided by the MSC, or some issue with the USB descriptors.

You could instrument the USB interactions, via the Nucleo VCP, and observe the interactions with Windows. You could validate the read/write block functionality.