Added new \ref SPI_GetCurrentMode() function to the SPI peripheral driver.

[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..2caacaa 100644 (file)
--- a/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
+++ b/LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
@@ -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. */
@@ -188,6 +195,15 @@
                                SPCR   = 0;
                                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)
+                       {
+                               return (SPCR & SPI_MODE_MASTER);
+                       }
 
                        /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.
                         *