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[pub/USBasp.git] / LUFA / Drivers / Peripheral / SPI.h

diff --git a/LUFA/Drivers/Peripheral/SPI.h b/LUFA/Drivers/Peripheral/SPI.h
index d8d60ed..6416cea 100644 (file)
--- a/LUFA/Drivers/Peripheral/SPI.h
+++ b/LUFA/Drivers/Peripheral/SPI.h
@@ -1,21 +1,21 @@
 /*\r
              LUFA Library\r
 /*\r
              LUFA Library\r

-     Copyright (C) Dean Camera, 2009.\r
+     Copyright (C) Dean Camera, 2010.\r

               \r
   dean [at] fourwalledcubicle [dot] com\r
       www.fourwalledcubicle.com\r
 */\r
 \r
 /*\r
               \r
   dean [at] fourwalledcubicle [dot] com\r
       www.fourwalledcubicle.com\r
 */\r
 \r
 /*\r

-  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
-  Permission to use, copy, modify, and distribute this software\r
-  and its documentation for any purpose and without fee is hereby\r
-  granted, provided that the above copyright notice appear in all\r
-  copies and that both that the copyright notice and this\r
-  permission notice and warranty disclaimer appear in supporting\r
-  documentation, and that the name of the author not be used in\r
-  advertising or publicity pertaining to distribution of the\r
+  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+  Permission to use, copy, modify, distribute, and sell this \r
+  software and its documentation for any purpose is hereby granted\r
+  without fee, provided that the above copyright notice appear in \r
+  all copies and that both that the copyright notice and this\r
+  permission notice and warranty disclaimer appear in supporting \r
+  documentation, and that the name of the author not be used in \r
+  advertising or publicity pertaining to distribution of the \r

   software without specific, written prior permission.\r
 \r
   The author disclaim all warranties with regard to this\r
   software without specific, written prior permission.\r
 \r
   The author disclaim all warranties with regard to this\r


@@ -41,7 +41,8 @@
  *    - None\r
  *\r
  *  \section Module Description\r
  *    - None\r
  *\r
  *  \section Module Description\r

- *  Functions, macros, variables, enums and types related to the setup of a the SPI port.\r
+ *  Driver for the hardware SPI port available on most AVR models. This module provides\r
+ *  an easy to use driver for the setup of and transfer of data over the AVR's SPI port.\r

  *\r
  *  @{\r
  */\r
  *\r
  *  @{\r
  */\r


@@ -60,7 +61,7 @@
        /* Private Interface - For use in library only: */\r
        #if !defined(__DOXYGEN__)\r
                /* Macros: */\r
        /* Private Interface - For use in library only: */\r
        #if !defined(__DOXYGEN__)\r
                /* Macros: */\r

-                       #define SPI_USE_DOUBLESPEED            (1 << 7)\r
+                       #define SPI_USE_DOUBLESPEED            (1 << SPE)\r

        #endif\r
        \r
        /* Public Interface - May be used in end-application: */\r
        #endif\r
        \r
        /* Public Interface - May be used in end-application: */\r


@@ -85,29 +86,58 @@
 \r
                        /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 128. */\r
                        #define SPI_SPEED_FCPU_DIV_128         ((1 << SPR1) | (1 << SPR0))\r
 \r
                        /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 128. */\r
                        #define SPI_SPEED_FCPU_DIV_128         ((1 << SPR1) | (1 << SPR0))\r

+                       \r
+                       /** SPI clock polarity mask for SPI_Init(). Indicates that the SCK should lead on the rising edge. */\r
+                       #define SPI_SCK_LEAD_RISING            (0 << CPOL)\r
+\r
+                       /** SPI clock polarity mask for SPI_Init(). Indicates that the SCK should lead on the falling edge. */\r
+                       #define SPI_SCK_LEAD_FALLING           (1 << CPOL)\r
+\r
+                       /** SPI data sample mode mask for SPI_Init(). Indicates that the data should sampled on the leading edge. */\r
+                       #define SPI_SAMPLE_LEADING             (0 << CPHA)\r
+\r
+                       /** SPI data sample mode mask for SPI_Init(). Indicates that the data should be sampled on the trailing edge. */\r
+                       #define SPI_SAMPLE_TRAILING            (1 << CPHA)\r
+                       \r
+                       /** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */\r
+                       #define SPI_MODE_SLAVE                 (0 << MSTR)\r
+\r
+                       /** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */\r
+                       #define SPI_MODE_MASTER                (1 << MSTR)\r

 \r
                /* Inline Functions: */\r
                        /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other\r
                         *  SPI routines.\r
                         *\r
 \r
                /* Inline Functions: */\r
                        /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other\r
                         *  SPI routines.\r
                         *\r

-                        *  \param PrescalerMask  Prescaler mask to set the SPI clock speed\r
-                        *  \param Master         If true, sets the SPI system to use master mode, slave if false\r
+                        *  \param[in] SPIOptions  SPI Options, a mask consisting of one of each of the SPI_SPEED_*,\r
+                        *                         SPI_SCK_*, SPI_SAMPLE_* and SPI_MODE_* masks\r

                         */\r
                         */\r

-                       static inline void SPI_Init(const uint8_t PrescalerMask, const bool Master)\r
+                       static inline void SPI_Init(const uint8_t SPIOptions)\r

                        {\r
                                DDRB  |= ((1 << 1) | (1 << 2));\r
                                PORTB |= ((1 << 0) | (1 << 3));\r
                                \r
                        {\r
                                DDRB  |= ((1 << 1) | (1 << 2));\r
                                PORTB |= ((1 << 0) | (1 << 3));\r
                                \r

-                               SPCR   = ((1 << SPE) | (Master << MSTR) | (1 << CPOL) | (1 << CPHA) |\r
-                                         (PrescalerMask & ~SPI_USE_DOUBLESPEED));\r
+                               SPCR   = ((1 << SPE) | SPIOptions);\r
+                               \r
+                               if (SPIOptions & SPI_USE_DOUBLESPEED)\r
+                                 SPSR |= (1 << SPI2X);\r
+                               else\r
+                                 SPSR &= ~(1 << SPI2X);\r
+                       }\r
+                       \r
+                       /** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */\r
+                       static inline void SPI_ShutDown(void)\r
+                       {\r
+                               DDRB  &= ~((1 << 1) | (1 << 2));\r
+                               PORTB &= ~((1 << 0) | (1 << 3));\r

                                \r
                                \r

-                               if (PrescalerMask & SPI_USE_DOUBLESPEED)\r
-                                 SPSR = (1 << SPI2X);\r
+                               SPCR   = 0;\r
+                               SPSR   = 0;\r

                        }\r
                        \r
                        /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.\r
                         *\r
                        }\r
                        \r
                        /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.\r
                         *\r

-                        *  \param Byte  Byte to send through the SPI interface\r
+                        *  \param[in] Byte  Byte to send through the SPI interface\r

                         *\r
                         *  \return Response byte from the attached SPI device\r
                         */\r
                         *\r
                         *  \return Response byte from the attached SPI device\r
                         */\r


@@ -122,7 +152,7 @@
                        /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response\r
                         *  byte sent to from the attached SPI device is ignored.\r
                         *\r
                        /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response\r
                         *  byte sent to from the attached SPI device is ignored.\r
                         *\r

-                        *  \param Byte Byte to send through the SPI interface\r
+                        *  \param[in] Byte Byte to send through the SPI interface\r

                         */\r
                        static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;\r
                        static inline void SPI_SendByte(const uint8_t Byte)\r
                         */\r
                        static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;\r
                        static inline void SPI_SendByte(const uint8_t Byte)\r