Fixed Serial peripheral driver not turning off the USART before reconfiguring it, which would cause incorrect operation to occur (thanks to Bob Paddock).

LUFA/Drivers/Peripheral/Serial.h

@@ -99,27 +99,27 @@
 			static inline void Serial_Init(const uint32_t BaudRate,
 			                               const bool DoubleSpeed)
 			{
+				UBRR1  = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
+
+				UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10));
 				UCSR1A = (DoubleSpeed ? (1 << U2X1) : 0);
 				UCSR1B = ((1 << TXEN1)  | (1 << RXEN1));
-				UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10));
 				
 				DDRD  |= (1 << 3);
 				PORTD |= (1 << 2);
-				
-				UBRR1  = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
 			}
 
 			/** Turns off the USART driver, disabling and returning used hardware to their default configuration. */
 			static inline void Serial_ShutDown(void)
 			{
-				UCSR1A = 0;
 				UCSR1B = 0;
+				UCSR1A = 0;
 				UCSR1C = 0;
 
+				UBRR1  = 0;
+				
 				DDRD  &= ~(1 << 3);
 				PORTD &= ~(1 << 2);
-				
-				UBRR1  = 0;
 			}
 
 			/** Indicates whether a character has been received through the USART.
@@ -143,7 +143,9 @@
 				UDR1 = DataByte;
 			}
 
-			/** Receives a byte from the USART.
+			/** Receives a byte from the USART. This function blocks until a byte has been
+			 *  received; if non-blocking behaviour is required, test for a received character
+			 *  beforehand with \ref Serial_IsCharReceived().
 			 *
 			 *  \return Byte received from the USART.
 			 */

LUFA/ManPages/ChangeLog.txt

@@ -65,6 +65,8 @@
   *  - Fixed MIDI_Device_SendEventPacket() not correctly waiting for the endpoint to become ready (thanks to Robin Green)
   *  - Fixed Benito and USBtoSerial projects not turning off the USART before reconfiguring it, which could cause incorrect
   *    operation to occur (thanks to Bob Paddock)
+  *  - Fixed Serial peripheral driver not turning off the USART before reconfiguring it, which would cause incorrect operation
+  *    to occur (thanks to Bob Paddock)
   *
   *  \section Sec_ChangeLog100513 Version 100513
   *  <b>New:</b>

Projects/USBtoSerial/USBtoSerial.c

@@ -86,7 +86,7 @@ int main(void)
 		if (!(ReceivedByte < 0) && !(RingBuffer_IsFull(&USBtoUSART_Buffer)))
 		  RingBuffer_AtomicInsert(&USBtoUSART_Buffer, (uint8_t)ReceivedByte);		
 		
-		/* Check if the software USART flush timer has expired */
+		/* Check if the UART receive buffer flush timer has expired */
 		if (TIFR0 & (1 << TOV0))
 		{
 			TIFR0 |= (1 << TOV0);

Projects/XPLAINBridge/XPLAINBridge.c

@@ -124,7 +124,7 @@ void UARTBridge_Task(void)
 	if (!(ReceivedByte < 0) && !(RingBuffer_IsFull(&USBtoUART_Buffer)))
 	  RingBuffer_AtomicInsert(&USBtoUART_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
 	
-	/* Check if the software UART flush timer has expired */
+	/* Check if the UART receive buffer flush timer has expired */
 	if (TIFR0 & (1 << TOV0))
 	{
 		TIFR0 |= (1 << TOV0);