USB MSC device implementation on Sensortile

[Bala K]

Posted on November 05, 2017 at 23:00

Hi,

I am trying to implement USB  mass storage device class on the Sensortile which uses STM32L476. I used the sample audio loop  app to verify that USB works fine. However, when I ported the MSC device functions from L476G-Eval directory, I am not able to get the interrupt coming for me. What is the right source code for porting msc device fns  into sensortile? Anybody has done it and it worked fine?

Thanks,

Bala.

#stm32l4-usb #usb #sensortile #usb-msc-device

[Bala K]

Posted on November 05, 2017 at 23:52

After I changed the line in USBD_LL_Init() as

           hpcd.Init.vbus_sensing_enable = 0;  // this was 1...

now I see that the USB Mass Storage Device is listed in windows device manager. But it cannot start for some reason.  Still needs some code change I think.

What I see is that the BSP SD card functions are not working properly. The HAL_Delay() was hanging up with SD  driver fns. I had to use cycle counter to implement the delay. Now I see that the usbd_storage.c is trying to call SD fns but for some reason SD card access is not happening. There are bugs in the code which I am not able to pin point. Anybody had found and fixed the bugs?