diff options
| -rw-r--r-- | cores/arduino/USBCore.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/cores/arduino/USBCore.cpp b/cores/arduino/USBCore.cpp index 3c7da86..44dce72 100644 --- a/cores/arduino/USBCore.cpp +++ b/cores/arduino/USBCore.cpp @@ -255,7 +255,9 @@ u8 USB_SendSpace(u8 ep) LockEP lock(ep); if (!ReadWriteAllowed()) return 0; - return USB_EP_SIZE - FifoByteCount(); + // subtract 1 from the EP size to never send a full packet, + // this avoids dealing with ZLP's in USB_Send + return USB_EP_SIZE - 1 - FifoByteCount(); } // Blocking Send of data to an endpoint |