From 3a85962f94eccfa86a5db46899bddeaceb79fee6 Mon Sep 17 00:00:00 2001
From: Dean Camera <dean@fourwalledcubicle.com>
Date: Sun, 16 Aug 2009 10:57:47 +0000
Subject: Fix USBtoSerial device demos -- ensure the UDR1 register contents is
 read in under all circumstances which fire the ISR, so that the receive
 complete interrupt is cleared correctly to prevent freezes.

---
 Demos/Device/ClassDriver/USBtoSerial/USBtoSerial.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'Demos/Device/ClassDriver/USBtoSerial')

diff --git a/Demos/Device/ClassDriver/USBtoSerial/USBtoSerial.c b/Demos/Device/ClassDriver/USBtoSerial/USBtoSerial.c
index 0c83cd8dd..8ef07f1c3 100644
--- a/Demos/Device/ClassDriver/USBtoSerial/USBtoSerial.c
+++ b/Demos/Device/ClassDriver/USBtoSerial/USBtoSerial.c
@@ -147,8 +147,10 @@ void EVENT_USB_Device_UnhandledControlPacket(void)
  */
 ISR(USART1_RX_vect, ISR_BLOCK)
 {
+	uint8_t ReceivedByte = UDR1;
+
 	if (USB_DeviceState == DEVICE_STATE_Configured)
-	  Buffer_StoreElement(&Tx_Buffer, UDR1);
+	  Buffer_StoreElement(&Tx_Buffer, ReceivedByte);
 }
 
 /** Event handler for the CDC Class driver Line Encoding Changed event.
-- 
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