Fixed incorrect implementation of LEDs_ToggleLEDs() for the Adafruit-U4 board (thanks...

[pub/USBasp.git] / LUFA / Drivers / Peripheral / AVR8 / SPI_AVR8.h

diff --git a/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h b/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
index 36e7de3..d6dc248 100644 (file)
--- 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
- * 
+ *
  *  @{
  */
 
@@ -139,7 +139,7 @@
                        /** 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. */
@@ -148,7 +148,7 @@
                        /** 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.