From 0c0436f47c296513dace43d3ba20e3cc36f8f527 Mon Sep 17 00:00:00 2001 From: Trygve Laugstøl Date: Sun, 25 Mar 2012 17:46:26 +0200 Subject: Board, rev A. --- firmware/LUFA/Drivers/Peripheral/SPI.h | 208 +++++++++++++++++++++++++++++++++ 1 file changed, 208 insertions(+) create mode 100644 firmware/LUFA/Drivers/Peripheral/SPI.h (limited to 'firmware/LUFA/Drivers/Peripheral/SPI.h') diff --git a/firmware/LUFA/Drivers/Peripheral/SPI.h b/firmware/LUFA/Drivers/Peripheral/SPI.h new file mode 100644 index 0000000..957325e --- /dev/null +++ b/firmware/LUFA/Drivers/Peripheral/SPI.h @@ -0,0 +1,208 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2010. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaim all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief Master include file for the SPI peripheral driver. + * + * Hardware SPI subsystem driver for the supported USB AVRs models. + */ + +/** \ingroup Group_PeripheralDrivers + * @defgroup Group_SPI SPI Driver - LUFA/Drivers/Peripheral/SPI.h + * + * \section Sec_Dependencies Module Source Dependencies + * The following files must be built with any user project that uses this module: + * - None + * + * \section Module Description + * Driver for the hardware SPI port available on most AVR models. This module provides + * an easy to use driver for the setup of and transfer of data over the AVR's SPI port. + * + * @{ + */ + +#ifndef __SPI_H__ +#define __SPI_H__ + + /* Includes: */ + #include + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + /* Macros: */ + #define SPI_USE_DOUBLESPEED (1 << SPE) + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** \name SPI Prescaler Configuration Masks */ + //@{ + /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 2. */ + #define SPI_SPEED_FCPU_DIV_2 SPI_USE_DOUBLESPEED + + /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 4. */ + #define SPI_SPEED_FCPU_DIV_4 0 + + /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 8. */ + #define SPI_SPEED_FCPU_DIV_8 (SPI_USE_DOUBLESPEED | (1 << SPR0)) + + /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 16. */ + #define SPI_SPEED_FCPU_DIV_16 (1 << SPR0) + + /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 32. */ + #define SPI_SPEED_FCPU_DIV_32 (SPI_USE_DOUBLESPEED | (1 << SPR1)) + + /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 64. */ + #define SPI_SPEED_FCPU_DIV_64 (SPI_USE_DOUBLESPEED | (1 << SPR1) | (1 << SPR0)) + + /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 128. */ + #define SPI_SPEED_FCPU_DIV_128 ((1 << SPR1) | (1 << SPR0)) + //@} + + /** \name SPI SCK Polarity Configuration Masks */ + //@{ + /** SPI clock polarity mask for SPI_Init(). Indicates that the SCK should lead on the rising edge. */ + #define SPI_SCK_LEAD_RISING (0 << CPOL) + + /** SPI clock polarity mask for SPI_Init(). Indicates that the SCK should lead on the falling edge. */ + #define SPI_SCK_LEAD_FALLING (1 << CPOL) + //@} + + /** \name SPI Sample Edge Configuration Masks */ + //@{ + /** SPI data sample mode mask for SPI_Init(). Indicates that the data should sampled on the leading edge. */ + #define SPI_SAMPLE_LEADING (0 << CPHA) + + /** SPI data sample mode mask for 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 SPI_Init(). Indicates that data should be shifted out MSB first. */ + #define SPI_ORDER_MSB_FIRST (0 << DORD) + + /** SPI data order mask for SPI_Init(). Indicates that data should be shifted out MSB first. */ + #define SPI_ORDER_LSB_FIRST (1 << DORD) + //@} + + /** \name SPI Mode Configuration Masks */ + //@{ + /** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */ + #define SPI_MODE_SLAVE (0 << MSTR) + + /** SPI mode mask for SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */ + #define SPI_MODE_MASTER (1 << MSTR) + //@} + + /* Inline Functions: */ + /** Initialises the SPI subsystem, ready for transfers. Must be called before calling any other + * SPI routines. + * + * \param[in] SPIOptions SPI Options, a mask consisting of one of each of the SPI_SPEED_*, + * SPI_SCK_*, SPI_SAMPLE_*, SPI_ORDER_* and SPI_MODE_* masks. + */ + static inline void SPI_Init(const uint8_t SPIOptions) + { + DDRB |= ((1 << 1) | (1 << 2)); + DDRB &= ~((1 << 0) | (1 << 3)); + PORTB |= ((1 << 0) | (1 << 3)); + + SPCR = ((1 << SPE) | SPIOptions); + + if (SPIOptions & SPI_USE_DOUBLESPEED) + SPSR |= (1 << SPI2X); + else + SPSR &= ~(1 << SPI2X); + } + + /** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */ + static inline void SPI_ShutDown(void) + { + DDRB &= ~((1 << 1) | (1 << 2)); + PORTB &= ~((1 << 0) | (1 << 3)); + + SPCR = 0; + SPSR = 0; + } + + /** 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. + * + * \return Response byte from the attached SPI device. + */ + static inline uint8_t SPI_TransferByte(const uint8_t Byte) ATTR_ALWAYS_INLINE; + static inline uint8_t SPI_TransferByte(const uint8_t Byte) + { + SPDR = Byte; + while (!(SPSR & (1 << SPIF))); + return SPDR; + } + + /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response + * byte sent to from the attached SPI device is ignored. + * + * \param[in] Byte Byte to send through the SPI interface. + */ + static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE; + static inline void SPI_SendByte(const uint8_t Byte) + { + SPDR = Byte; + while (!(SPSR & (1 << SPIF))); + } + + /** Sends a dummy byte through the SPI interface, blocking until the transfer is complete. The response + * byte from the attached SPI device is returned. + * + * \return The response byte from the attached SPI device. + */ + static inline uint8_t SPI_ReceiveByte(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT; + static inline uint8_t SPI_ReceiveByte(void) + { + SPDR = 0x00; + while (!(SPSR & (1 << SPIF))); + return SPDR; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + -- cgit v1.2.3