X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/3d818fbb86ddb648c6df4d9389dc025510a169b6..d90ef9aa2f97a5f8b5fd2cf0bd9564025d069f6e:/Projects/USBtoSerial/USBtoSerial.c

diff --git a/Projects/USBtoSerial/USBtoSerial.c b/Projects/USBtoSerial/USBtoSerial.c
index 1c791d95d..b51c7c258 100644
--- a/Projects/USBtoSerial/USBtoSerial.c
+++ b/Projects/USBtoSerial/USBtoSerial.c
@@ -133,8 +133,8 @@ int main(void)
 			}
 		}
 
-		/* Load the next byte from the USART transmit buffer into the USART */
-		if (!(RingBuffer_IsEmpty(&USBtoUSART_Buffer)))
+		/* Load the next byte from the USART transmit buffer into the USART if transmit buffer space is available */
+		if (Serial_IsSendReady() && !(RingBuffer_IsEmpty(&USBtoUSART_Buffer)))
 		  Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer));
 
 		CDC_Device_USBTask(&VirtualSerial_CDC_Interface);