X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/f01a05415c03b0dd61297849ece2cfcce7f8d3e8..154d28e39f114c1e1af223ae6c37e34323e6be9d:/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h?ds=inline

diff --git a/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h b/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
index 634c54480..d6dc248f7 100644
--- a/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
+++ b/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
@@ -70,7 +70,7 @@
  *      // Send a byte, and store the received byte from the same transaction
  *      uint8_t ResponseByte = SPI_TransferByte(0xDC);
  *  \endcode
- * 
+ *
  *  @{
  */
 
@@ -139,16 +139,16 @@
 			/** SPI data sample mode mask for \c SPI_Init(). Indicates that the data should be sampled on the trailing edge. */
 			#define SPI_SAMPLE_TRAILING            (1 << CPHA)
 			//@}
-			
+
 			/** \name SPI Data Ordering Configuration Masks */
 			//@{
 			/** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out MSB first. */
 			#define SPI_ORDER_MSB_FIRST            (0 << DORD)
 
-			/** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out MSB first. */
+			/** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out LSB first. */
 			#define SPI_ORDER_LSB_FIRST            (1 << DORD)
 			//@}
-			
+
 			/** \name SPI Mode Configuration Masks */
 			//@{
 			/** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */
@@ -157,7 +157,7 @@
 			/** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */
 			#define SPI_MODE_MASTER                (1 << MSTR)
 			//@}
-			
+
 		/* Inline Functions: */
 			/** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other
 			 *  SPI routines.
@@ -167,16 +167,23 @@
 			 */
 			static inline void SPI_Init(const uint8_t SPIOptions)
 			{
-				DDRB  |=  ((1 << 1) | (1 << 2));
-				DDRB  &= ~((1 << 0) | (1 << 3));
-				PORTB |=  ((1 << 0) | (1 << 3));
+				/* Prevent high rise times on PB.0 (/SS) from forcing a change to SPI slave mode */
+				DDRB  |= (1 << 0);
+				PORTB |= (1 << 0);
 
-				SPCR   = ((1 << SPE) | SPIOptions);
+				DDRB  |=  ((1 << 1) | (1 << 2));
+				DDRB  &= ~(1 << 3);
+				PORTB |=  (1 << 3);
 
 				if (SPIOptions & SPI_USE_DOUBLESPEED)
 				  SPSR |= (1 << SPI2X);
 				else
 				  SPSR &= ~(1 << SPI2X);
+
+				/* Switch /SS to input mode after configuration to allow for forced mode changes */
+				DDRB &= ~(1 << 0);
+
+				SPCR  = ((1 << SPE) | SPIOptions);
 			}
 
 			/** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */
@@ -189,6 +196,16 @@
 				SPSR   = 0;
 			}
 
+			/** Retrieves the currently selected SPI mode, once the SPI interface has been configured.
+			 *
+			 *  \return \ref SPI_MODE_MASTER if the interface is currently in SPI Master mode, \ref SPI_MODE_SLAVE otherwise
+			 */
+			static inline uint8_t SPI_GetCurrentMode(void) ATTR_ALWAYS_INLINE;
+			static inline uint8_t SPI_GetCurrentMode(void)
+			{
+				return (SPCR & SPI_MODE_MASTER);
+			}
+
 			/** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.
 			 *
 			 *  \param[in] Byte  Byte to send through the SPI interface.