About CZ.4

CZ.4 · 2021-07-07

I'm using a STM32L4A6 with OTG_FS peripheral. I use the USB driver from STM. I only get the suspend callback, but never resume, or connected, or disconnected callback. Suspend is not good indicator for plug in or out. Even USB cable plug in will also...

CZ.4 · 2021-07-04

I'm using STM32L4A6 and it's SDMMC peripheral to communicate with an eMMC device.I found it occasionally get stuck in the MMC_InitCard() call. Further investigation shows it's stuck in the MMC_ReadExtCSD() call, where it utilizes a timeout value of 0...

CZ.4 · 2021-07-07

Ok, I see. But if the VBUS from the cable actually is connected to the VBUS pin, then the USB driver library will automatically detect the presence and trigger those callbacks?

CZ.4 · 2021-07-07

Are you saying VBUS can be routed to a GPIO pin and then try to detect the pin to be 0 or 1? I checked out schematics it seems the VBUS pin (PA9 on the STM32L4A6) is not connected.Also what are those call backs for - connected/disconnected callback?

CZ.4 · 2021-07-07

Ok, thanks!

CZ.4 · 2021-07-05

Thanks for the info. Can you elaborate how to customize this timeout value? Without being an expert on MMC it's hard to guess what value is suitable. In this case I experiment with 1000ms. It seems working ok so far.I also found these macros regardin...

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STM32L4 how to get USB connect/disconnect events

STM32L4: HAL_MMC driver - get stuck in MMC_ReadExtCSD()

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