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

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

diff --git a/Projects/XPLAINBridge/XPLAINBridge.c b/Projects/XPLAINBridge/XPLAINBridge.c
index 7c824ec..912e683 100644 (file)
--- a/Projects/XPLAINBridge/XPLAINBridge.c
+++ b/Projects/XPLAINBridge/XPLAINBridge.c
@@ -136,9 +136,19 @@ void UARTBridge_Task(void)
                /* Clear flush timer expiry flag */
                TIFR0 |= (1 << TOV0);
 
-               /* Read bytes from the UART receive buffer into the USB IN endpoint */
+               /* Read bytes from the USART receive buffer into the USB IN endpoint */
                while (BufferCount--)
-                 CDC_Device_SendByte(&VirtualSerial_CDC_Interface, RingBuffer_Remove(&UARTtoUSB_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(&UARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
+                       {
+                               break;
+                       }
+
+                       /* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */
+                       RingBuffer_Remove(&UARTtoUSB_Buffer);
+               }
        }
 
        CDC_Device_USBTask(&VirtualSerial_CDC_Interface);