stm32L452CEU6 usb doesnt work with Samsung GalaxyTab A8

[anees]

I have a board design based on stm32L452 , USB gets recognized on a windows PC and I can talk to the device over any software like putty and a Test software sees the com port and can to the device. However in Android (Iam using samsung  GalaxyTab A8), usb is not even recognized. The Tab support OTG mode and I did change default USB mode in the tab (Tried all the combo, file transfer, teethering, media etc). Nothing helps. Any advice is greatly appreciated

[jaindevasy]

We will check that.

How we can enable debug message from USB lib and where we can see these messages?

[AScha.3]

You need SWO /swd , then if enable the debug msg in Cube setup, see it.

+ in Cube set debug -> 

(search/read here in forum, how to do - i wrote it > 2 times. )

[jaindevasy]

I have followed the previous recommendation and enabled debug message in cube ide setup and enabled SWO in debug configuration. But, when I tried to print a sample string "Hello" I got some junk values. Could you please confirm if there is any other configuration?

[anees]

Just few updates

1) Tried USB mass storage, it came up on windows and mac but not working in Android

2) CDC driver same behavior , works in windows and mac but not in android

3) Use the external clk so crs_sync is no longer used

4) USB D- and D+ are correct. Its just a connector naming issue ( otherwise as u said it wouldnt work in windows or mac)

In all combinations, so far it works in windows/mac but not in android. We are basically stuck with this issue.

Currently looking at pulling log information via SWD, even though message comes out, its all scrambled , why would it be?  clk issue ?

[anees]

for clarity, we are not setup for 48M for USB from HSE/PLL.

What else we can try? 

1) Try another android tab ? ( we are using galaxy A8 and A2, same behaviour)

2) Heard there is an Android sim software that can run on PC? may be try that and see?

Any other suggestions?

[AScha.3]

SWO output looks like wrong speed setting.

Did you set the real cpu core clk frequency in debug ?

->

+

>for clarity, we are not setup for 48M for USB from HSE/PLL.

eh ? not 48M or just using HSI ?

[jaindevasy]

Core frequency we set to 80MHz, which is the frequency the controller running

[anees]

for clarity, we are setup for 48M for USB from HSE/PLL. (sorry about typo, it is 48M for USB from HSE/PLL)

[AScha.3]

Ok, and also correct clock in debug -> swo settings -> 

(here on H563 at 250M )

[jaindevasy]

Below are the settings we done