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Merge pull request #9789 from etracer65/hal_vcp_64byte_receive_fix

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Michael Keller 2020-05-14 02:12:02 +12:00 • committed by mikeller
parent 68a75591f4
commit 3e4b51e09b
1 changed files with 6 additions and 0 deletions
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6
src/main/vcp_hal/usbd_cdc_interface.c
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@ -299,6 +299,12 @@ static int8_t CDC_Itf_Receive(uint8_t* Buf, uint32_t *Len)
{ {
rxAvailable = *Len; rxAvailable = *Len;
rxBuffPtr = Buf; rxBuffPtr = Buf;
if (!rxAvailable) {
// Received an empty packet, trigger receiving the next packet.
// This will happen after a packet that's exactly 64 bytes is received.
// The USB protocol requires that an empty (0 byte) packet immediately follow.
USBD_CDC_ReceivePacket(&USBD_Device);
}
return (USBD_OK); return (USBD_OK);
} }