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158 lines
5.8 KiB
158 lines
5.8 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* SPI driver for the 32-bit AVRs.
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*
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* \note This file should not be included directly. It is automatically included as needed by the SPI driver
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* dispatch header located in LUFA/Drivers/Peripheral/SPI.h.
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*/
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/** \ingroup Group_SPI
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* @defgroup Group_SPI_AVR32 32-Bit AVR SPI Driver
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*
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* SPI driver for the 32-bit AVRs.
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*
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* \note This file should not be included directly. It is automatically included as needed by the ADC driver
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* dispatch header located in LUFA/Drivers/Peripheral/SPI.h.
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*
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* @{
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*/
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#ifndef __SPI_AVR32_H__
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#define __SPI_AVR32_H__
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/* Includes: */
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#include <avr32/io.h>
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#include <stdbool.h>
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_SPI_H)
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#error Do not include this file directly. Include LUFA/Drivers/Peripheral/SPI.h instead.
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#endif
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 1. */
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#define SPI_SPEED_FCPU_DIV_1 0
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/** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 32. */
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#define SPI_SPEED_FCPU_DIV_32 AVR32_SPI_MR_FDIV_MASK
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/** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */
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#define SPI_MODE_SLAVE 0
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/** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */
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#define SPI_MODE_MASTER AVR32_SPI_MR_MSTR_MASK
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/* Inline Functions: */
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/** Initialises the SPI subsystem, ready for transfers. Must be called before calling any other
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* SPI routines.
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*
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* \note The individual AVR32 chip select control registers are left at their defaults; it is up to the user
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* to configure these seperately once the SPI module has been initialized.
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*
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* \note The physical GPIO pins for the AVR32's SPI are not altered; it is up to the user to
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* configure these seperately to connect the SPI module to the desired GPIO pins via the
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* GPIO MUX registers.
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*
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* \param[in] SPIOptions SPI Options, a mask consisting of one of each of the SPI_SPEED_*
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* and SPI_MODE_* masks
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*/
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static inline void SPI_Init(const uintN_t SPIOptions)
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{
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AVR32_SPI.cr = (AVR32_SPI_CR_SPIEN_MASK | AVR32_SPI_CR_SWRST_MASK);
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AVR32_SPI.mr = SPIOptions;
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}
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/** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */
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static inline void SPI_ShutDown(void)
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{
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AVR32_SPI.cr = AVR32_SPI_CR_SPIDIS_MASK;
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}
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/** Sends and receives a transfer through the SPI interface, blocking until the transfer is complete.
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* The width of the data that is transferred is dependant on the settings of the currently selected
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* peripheral.
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*
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* \param[in] Data Data to send through the SPI interface
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*
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* \return Response data from the attached SPI device
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*/
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static inline uint16_t SPI_Transfer(const uint16_t Data) ATTR_ALWAYS_INLINE;
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static inline uint16_t SPI_Transfer(const uint16_t Data)
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{
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AVR32_SPI.TDR.td = Data;
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while (!(AVR32_SPI.SR.tdre));
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return AVR32_SPI.rdr;
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}
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/** Sends a transfer through the SPI interface, blocking until the transfer is complete. The response
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* data sent to from the attached SPI device is ignored. The width of the data that is transferred is
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* dependant on the settings of the currently selected peripheral.
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*
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* \param[in] Data Data to send through the SPI interface
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*/
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static inline void SPI_Send(const uint16_t Data) ATTR_ALWAYS_INLINE;
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static inline void SPI_Send(const uint16_t Data)
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{
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AVR32_SPI.TDR.td = Data;
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while (!(AVR32_SPI.SR.tdre));
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}
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/** Sends a dummy transfer through the SPI interface, blocking until the transfer is complete. The response
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* data from the attached SPI device is returned. The width of the data that is transferred is dependant on
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* the settings of the currently selected peripheral.
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*
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* \return The response data from the attached SPI device
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*/
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static inline uint16_t SPI_Receive(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
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static inline uint16_t SPI_Receive(void)
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{
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AVR32_SPI.TDR.td = 0x0000;
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while (!(AVR32_SPI.SR.tdre));
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return AVR32_SPI.RDR.rd;
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}
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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