From 74298f8ca11dc8d3b0359d1d4e124d6494c3eeac Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Fri, 10 Apr 2009 01:15:42 +0200 Subject: * digital/avr/modules/usb: - imported LUFA. --- .../modules/usb/lufa/LUFA/Drivers/AT90USBXXX/SPI.h | 139 +++++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 digital/avr/modules/usb/lufa/LUFA/Drivers/AT90USBXXX/SPI.h (limited to 'digital/avr/modules/usb/lufa/LUFA/Drivers/AT90USBXXX/SPI.h') diff --git a/digital/avr/modules/usb/lufa/LUFA/Drivers/AT90USBXXX/SPI.h b/digital/avr/modules/usb/lufa/LUFA/Drivers/AT90USBXXX/SPI.h new file mode 100644 index 00000000..0b333a80 --- /dev/null +++ b/digital/avr/modules/usb/lufa/LUFA/Drivers/AT90USBXXX/SPI.h @@ -0,0 +1,139 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2009. + + dean [at] fourwalledcubicle [dot] com + www.fourwalledcubicle.com +*/ + +/* + Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, and distribute this software + and its documentation for any purpose and without fee is hereby + granted, 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 + * + * Hardware SPI subsystem driver for the supported USB AVRs models. + */ + +#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 << 7) + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** 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)) + + /* Inline Functions: */ + /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other + * SPI routines. + * + * \param PrescalerMask Prescaler mask to set the SPI clock speed + * \param Master If true, sets the SPI system to use master mode, slave if false + */ + static inline void SPI_Init(const uint8_t PrescalerMask, const bool Master) + { + DDRB |= ((1 << 1) | (1 << 2)); + PORTB |= ((1 << 0) | (1 << 3)); + + SPCR = ((1 << SPE) | (Master << MSTR) | (1 << CPOL) | (1 << CPHA) | + (PrescalerMask & ~SPI_USE_DOUBLESPEED)); + + if (PrescalerMask & SPI_USE_DOUBLESPEED) + SPSR = (1 << SPI2X); + } + + /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete. + * + * \param 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_ALWAYSINLINE; + 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 Byte Byte to send through the SPI interface + */ + static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYSINLINE; + 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_ALWAYSINLINE 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