Posted on June 22, 2016 at 12:51Hi,
I have
STM32L4 based board having
USB OTG Connector.
I have
microSD Card interfaced on
SDIO (4-bit) and am using the
FatFS by
Chen from
CubeMX.
I have used the code from
CubeMX to configure the
STM32L4 as
USBD MSC.
I am able to get the USB enumerated on the PC when I connect the USB cable.
But I observed that if any write/open calls to Filesystem are ongoing when this enumeration of USB is happening, then the Filesystem operations are stuck.
After debugging, I found that when the
USBD_Connect() is called, and the USB cable is already connected to the PC, the
HAL_PCD_IRQHandler() is called multiple times.
It takes around
~2.914 seconds after which this
HAL_PCD_IRQHandler() is not called and the USB is detected on the PC as Mass Storage.
So if I put a delay of
3 seconds after the
USBD_Connect() call, then all the Filesystem related operations work fine.
So is there any other way by which I can avoid to put this delay of 3 seconds ?
Thanks,
Sunny
#stm32l4 #usbd #msc
