USB device double buffering (CDC Class).

Hi,

I have some difficulties to configure USB device using OUT EP double buffering (used with CC class).

While using simple buffering we get slow transfer rates (1 out o 2 packet NAKed), when I use HAL_PCDEx_PMAConfig(PCD_DBL_BUF), USB transfers hangs.

Do you have some tested the functionality, and some application otes ?

Thanks

regards

Stéphane VIALLE

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