X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/312748702a0f87f79c6e86745d3699d09a91778c..05fcf7e2a79bebb978d4aeaef26b12f70c6826f8:/LUFA/Drivers/Peripheral/Serial.h

diff --git a/LUFA/Drivers/Peripheral/Serial.h b/LUFA/Drivers/Peripheral/Serial.h
index e688cfc02..326d0fd64 100644
--- a/LUFA/Drivers/Peripheral/Serial.h
+++ b/LUFA/Drivers/Peripheral/Serial.h
@@ -68,12 +68,12 @@
 			/** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
 			 *  not set.
 			 */
-			#define SERIAL_UBBRVAL(baud)    (((F_CPU / 16) / baud) - 1)
+			#define SERIAL_UBBRVAL(baud)    (((F_CPU / 16) / (baud)) - 1)
 
 			/** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
 			 *  set.
 			 */
-			#define SERIAL_2X_UBBRVAL(baud) (((F_CPU / 8) / baud) - 1)
+			#define SERIAL_2X_UBBRVAL(baud) (((F_CPU / 8) / (baud)) - 1)
 
 		/* Pseudo-Function Macros: */
 			#if defined(__DOXYGEN__)
@@ -100,7 +100,7 @@
 			void Serial_TxString(const char *StringPtr) ATTR_NON_NULL_PTR_ARG(1);
 
 		/* Inline Functions: */
-			/** Initializes the USART, ready for serial data transmission and reception. This initialises the interface to
+			/** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to
 			 *  standard 8-bit, no parity, 1 stop bit settings suitable for most applications.
 			 *
 			 *  \param[in] BaudRate     Serial baud rate, in bits per second
@@ -118,6 +118,19 @@
 				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;
+				UCSR1C = 0;
+				
+				DDRD  &= ~(1 << 3);	
+				PORTD &= ~(1 << 2);
+				
+				UBRR1  = 0;
+			}
+			
 			/** Transmits a given byte through the USART.
 			 *
 			 *  \param[in] DataByte  Byte to transmit through the USART