+++ /dev/null
-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2010.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\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, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** \file\r
- *\r
- * SPI driver for the 32-bit AVRs.\r
- *\r
- * \note This file should not be included directly. It is automatically included as needed by the SPI driver\r
- * dispatch header located in LUFA/Drivers/Peripheral/SPI.h.\r
- */\r
- \r
-/** \ingroup Group_SPI\r
- * @defgroup Group_SPI_AVR32 32-Bit AVR SPI Driver\r
- *\r
- * SPI driver for the 32-bit AVRs.\r
- *\r
- * \note This file should not be included directly. It is automatically included as needed by the ADC driver\r
- * dispatch header located in LUFA/Drivers/Peripheral/SPI.h.\r
- *\r
- * @{\r
- */\r
-\r
-#ifndef __SPI_AVR32_H__\r
-#define __SPI_AVR32_H__\r
-\r
- /* Includes: */\r
- #include <avr32/io.h>\r
- #include <stdbool.h>\r
-\r
- /* Preprocessor Checks: */\r
- #if !defined(__INCLUDE_FROM_SPI_H)\r
- #error Do not include this file directly. Include LUFA/Drivers/Peripheral/SPI.h instead.\r
- #endif\r
-\r
- /* Enable C linkage for C++ Compilers: */\r
- #if defined(__cplusplus)\r
- extern "C" {\r
- #endif\r
- \r
- /* Public Interface - May be used in end-application: */\r
- /* Macros: */\r
- /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 1. */\r
- #define SPI_SPEED_FCPU_DIV_1 0\r
-\r
- /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 32. */\r
- #define SPI_SPEED_FCPU_DIV_32 AVR32_SPI_MR_FDIV_MASK\r
- \r
- /** SPI chip selection mode for direct peripheral-to-CS pin connections. */\r
- #define SPI_CS_4BITDECODER AVR32_SPI_MR_PSDEC_MASK\r
- \r
- /** SPI chip selection mode for peripheral CS pin connections through a 4-bit decoder. */\r
- #define SPI_CS_DIRECT 0\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\r
-\r
- /** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */\r
- #define SPI_MODE_MASTER AVR32_SPI_MR_MSTR_MASK\r
-\r
- /* Inline Functions: */\r
- /** Initialises the SPI subsystem, ready for transfers. Must be called before calling any other\r
- * SPI routines.\r
- *\r
- * \note The individual AVR32 chip select control registers are left at their defaults; it is up to the user\r
- * to configure these seperately once the SPI module has been initialized.\r
- *\r
- * \note The physical GPIO pins for the AVR32's SPI are not altered; it is up to the user to\r
- * configure these seperately to connect the SPI module to the desired GPIO pins via the\r
- * GPIO MUX registers.\r
- *\r
- * \param[in] SPIOptions SPI Options, a mask consisting of one of each of the SPI_SPEED_*,\r
- * SPI_CS_* and SPI_MODE_* masks\r
- */\r
- static inline void SPI_Init(const uintN_t SPIOptions)\r
- {\r
- AVR32_PM.pbamask = (1 << 5);\r
-\r
- AVR32_SPI.CR.swrst = true;\r
- AVR32_SPI.CR.spien = true;\r
- AVR32_SPI.mr = SPIOptions;\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
- AVR32_SPI.cr = AVR32_SPI_CR_SPIDIS_MASK;\r
-\r
- AVR32_PM.pbamask &= ~(1 << 5);\r
- }\r
- \r
- /** Sends and receives a transfer through the SPI interface, blocking until the transfer is complete.\r
- * The width of the data that is transferred is dependant on the settings of the currently selected\r
- * peripheral.\r
- *\r
- * \param[in] Data Data to send through the SPI interface\r
- *\r
- * \return Response data from the attached SPI device\r
- */\r
- static inline uint16_t SPI_Transfer(const uint16_t Data) ATTR_ALWAYS_INLINE;\r
- static inline uint16_t SPI_Transfer(const uint16_t Data)\r
- {\r
- while (!(AVR32_SPI.SR.tdre));\r
- AVR32_SPI.TDR.td = Data;\r
-\r
- while ((AVR32_SPI.sr & (AVR32_SPI_SR_RDRF_MASK | AVR32_SPI_SR_TXEMPTY_MASK)) !=\r
- (AVR32_SPI_SR_RDRF_MASK | AVR32_SPI_SR_TXEMPTY_MASK));\r
- return AVR32_SPI.RDR.rd;\r
- }\r
-\r
- /** Sends a transfer through the SPI interface, blocking until the transfer is complete. The response\r
- * data sent to from the attached SPI device is ignored. The width of the data that is transferred is\r
- * dependant on the settings of the currently selected peripheral.\r
- *\r
- * \param[in] Data Data to send through the SPI interface\r
- */\r
- static inline void SPI_Send(const uint16_t Data) ATTR_ALWAYS_INLINE;\r
- static inline void SPI_Send(const uint16_t Data)\r
- {\r
- while (!(AVR32_SPI.SR.tdre));\r
- AVR32_SPI.TDR.td = Data;\r
- }\r
-\r
- /** Sends a dummy transfer through the SPI interface, blocking until the transfer is complete. The response\r
- * data from the attached SPI device is returned. The width of the data that is transferred is dependant on\r
- * the settings of the currently selected peripheral.\r
- *\r
- * \return The response data from the attached SPI device\r
- */\r
- static inline uint16_t SPI_Receive(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;\r
- static inline uint16_t SPI_Receive(void)\r
- {\r
- while (!(AVR32_SPI.SR.tdre));\r
- AVR32_SPI.TDR.td = 0x0000;\r
-\r
- while ((AVR32_SPI.sr & (AVR32_SPI_SR_RDRF_MASK | AVR32_SPI_SR_TXEMPTY_MASK)) !=\r
- (AVR32_SPI_SR_RDRF_MASK | AVR32_SPI_SR_TXEMPTY_MASK));\r
- return AVR32_SPI.RDR.rd;\r
- }\r
-\r
- /* Disable C linkage for C++ Compilers: */\r
- #if defined(__cplusplus)\r
- }\r
- #endif\r
- \r
-#endif\r
-\r
-/** @} */\r
projects / pub / lufa.git / blobdiff