Fixed possible lost data in the XPLAINBridge, USBtoSerial and Benito projects when...

[pub/USBasp.git] / Projects / USBtoSerial / USBtoSerial.c

diff --git a/Projects/USBtoSerial/USBtoSerial.c b/Projects/USBtoSerial/USBtoSerial.c
index 1dfd708..477dd44 100644 (file)
--- a/Projects/USBtoSerial/USBtoSerial.c
+++ b/Projects/USBtoSerial/USBtoSerial.c
@@ -100,7 +100,17 @@ int main(void)
 
                        /* Read bytes from the USART receive buffer into the USB IN endpoint */
                        while (BufferCount--)
-                         CDC_Device_SendByte(&VirtualSerial_CDC_Interface, RingBuffer_Remove(&USARTtoUSB_Buffer));
+                       {
+                               /* Try to send the next byte of data to the host, abort if there is an error without dequeuing */
+                               if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
+                                                       RingBuffer_Peek(&USARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
+                               {
+                                       break;
+                               }
+
+                               /* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */
+                               RingBuffer_Remove(&USARTtoUSB_Buffer);
+                       }
                }
 
                /* Load the next byte from the USART transmit buffer into the USART */