X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/d90ef9aa2f97a5f8b5fd2cf0bd9564025d069f6e..9efce7263c63b5130edfe027c39715f3c9d84c5a:/Projects/USBtoSerial/USBtoSerial.c

diff --git a/Projects/USBtoSerial/USBtoSerial.c b/Projects/USBtoSerial/USBtoSerial.c
index b51c7c258..343b51ba5 100644
--- a/Projects/USBtoSerial/USBtoSerial.c
+++ b/Projects/USBtoSerial/USBtoSerial.c
@@ -194,7 +194,7 @@ ISR(USART1_RX_vect, ISR_BLOCK)
 {
 	uint8_t ReceivedByte = UDR1;
 
-	if (USB_DeviceState == DEVICE_STATE_Configured)
+	if ((USB_DeviceState == DEVICE_STATE_Configured) && !(RingBuffer_IsFull(&USARTtoUSB_Buffer)))
 	  RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte);
 }