X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/fb76acb0844a2528c32610455a8c7cd5266f3027..d4b45e8502a27c0f5ad3e26eabd2b30e84c20bac:/Projects/XPLAINBridge/XPLAINBridge.c

diff --git a/Projects/XPLAINBridge/XPLAINBridge.c b/Projects/XPLAINBridge/XPLAINBridge.c
index 15cb87dc4..bee770a98 100644
--- a/Projects/XPLAINBridge/XPLAINBridge.c
+++ b/Projects/XPLAINBridge/XPLAINBridge.c
@@ -1,13 +1,13 @@
 /*
              LUFA Library
-     Copyright (C) Dean Camera, 2010.
+     Copyright (C) Dean Camera, 2012.
 
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
 
 /*
-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
@@ -31,7 +31,7 @@
 /** \file
  *
  *  Main source file for the XPLAINBridge project. This file contains the main tasks of
- *  the demo and is responsible for the initial application hardware configuration.
+ *  the project and is responsible for the initial application hardware configuration.
  */
 
 #include "XPLAINBridge.h"
@@ -64,10 +64,16 @@ USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
 	};
 
 /** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
-RingBuff_t USBtoUART_Buffer;
+RingBuffer_t   USBtoUART_Buffer;
+
+/** Underlying data buffer for \ref USBtoUART_Buffer, where the stored bytes are located. */
+static uint8_t USBtoUART_Buffer_Data[128];
 
 /** Circular buffer to hold data from the serial port before it is sent to the host. */
-RingBuff_t UARTtoUSB_Buffer;
+RingBuffer_t   UARTtoUSB_Buffer;
+
+/** Underlying data buffer for \ref UARTtoUSB_Buffer, where the stored bytes are located. */
+static uint8_t UARTtoUSB_Buffer_Data[128];
 
 
 /** Main program entry point. This routine contains the overall program flow, including initial
@@ -128,17 +134,27 @@ void UARTBridge_Task(void)
 		if (!(ReceivedByte < 0))
 		  RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte);
 	}
-	
+
 	/* Check if the UART receive buffer flush timer has expired or buffer is nearly full */
-	RingBuff_Count_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer);
+	uint16_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer);
 	if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200))
 	{
 		/* 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);
@@ -165,7 +181,7 @@ void SetupHardware(void)
 
 	/* Enable pull-up on the JTAG TDI pin so we can use it to select the mode */
 	PORTF |= (1 << 7);
-	_delay_ms(10);
+	Delay_MS(10);
 
 	/* Select the firmware mode based on the JTD pin's value */
 	CurrentFirmwareMode = (PINF & (1 << 7)) ? MODE_USART_BRIDGE : MODE_PDI_PROGRAMMER;
@@ -189,8 +205,8 @@ void EVENT_USB_Device_ConfigurationChanged(void)
 		TCCR0B = ((1 << CS02) | (1 << CS00));
 
 		/* Initialize ring buffers used to hold serial data between USB and software UART interfaces */
-		RingBuffer_InitBuffer(&USBtoUART_Buffer);
-		RingBuffer_InitBuffer(&UARTtoUSB_Buffer);
+		RingBuffer_InitBuffer(&USBtoUART_Buffer, USBtoUART_Buffer_Data, sizeof(USBtoUART_Buffer_Data));
+		RingBuffer_InitBuffer(&UARTtoUSB_Buffer, UARTtoUSB_Buffer_Data, sizeof(UARTtoUSB_Buffer_Data));
 
 		/* Start the software USART */
 		SoftUART_Init();