Fixed error, when host send some buffer, less then minimum. - #466
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Fixed error, when host send some buffer, less then minimum.
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Fixed error, when host send some buffer, less then minimum, and new buffer can't be allocated
I found error in my buffer flipping technology (for usb CDC). When host sends some buffer, less than maxpacket and queue is full, USBD_CDC_Receive does nothing... But, it means, that usb pcd try to fill the rest of previously allocated buffer, and it will expect, that host will send buffer, smaller that maxpacket. But as a rule it is not. So, we must clear pcd buffer in this case.