diff --git a/src/portable/st/synopsys/dcd_synopsys.c b/src/portable/st/synopsys/dcd_synopsys.c index b47101e60..84430ec98 100644 --- a/src/portable/st/synopsys/dcd_synopsys.c +++ b/src/portable/st/synopsys/dcd_synopsys.c @@ -576,6 +576,15 @@ static void handle_rxflvl_ints(USB_OTG_OUTEndpointTypeDef * out_ep) { // Increment pointer to xfer data xfer->buffer += bcnt; + + // Truncate transfer length in case of short packet + if(bcnt < xfer->max_size) { + xfer->total_len -= (out_ep[epnum].DOEPTSIZ & USB_OTG_DOEPTSIZ_XFRSIZ_Msk) >> USB_OTG_DOEPTSIZ_XFRSIZ_Pos; + if(epnum == 0) { + xfer->total_len -= ep0_pending[TUSB_DIR_OUT]; + ep0_pending[TUSB_DIR_OUT] = 0; + } + } } break; case 0x03: // Out packet done (Interrupt)