Resolved! STM32F (429) USB EP0 IN with DMA does not work, always sends zero bytes
program EP0 for an simple IN transmit epIn->DIEPINT = -1; //clear ints epIn->DIEPTSIZ &=~ (USB_OTG_DIEPTSIZ_PKTCNT_Msk | USB_OTG_DIEPTSIZ_XFRSIZ_Msk); epIn->DIEPTSIZ |= (numPackets << USB_OTG_DIEPTSIZ_PKTCNT_Pos) | (len << USB_OTG_DIEPTSIZ_XFRS...