diff options
Diffstat (limited to 'protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h')
| -rw-r--r-- | protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h b/protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h new file mode 100644 index 0000000000..25fb73d16f --- /dev/null +++ b/protocol/lufa/LUFA-120730/LUFA/Drivers/Peripheral/XMEGA/SPI_XMEGA.h @@ -0,0 +1,248 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2012.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2012 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 SPI Peripheral Driver (XMEGA)
+ *
+ * On-chip SPI driver for the XMEGA microcontrollers.
+ *
+ * \note This file should not be included directly. It is automatically included as needed by the SPI driver
+ * dispatch header located in LUFA/Drivers/Peripheral/SPI.h.
+ */
+
+/** \ingroup Group_SPI
+ * \defgroup Group_SPI_XMEGA SPI Peripheral Driver (XMEGA)
+ *
+ * \section Sec_ModDescription Module Description
+ * Driver for the hardware SPI port(s) available on XMEGA AVR microcontroller models. This
+ * module provides an easy to use driver for the setup and transfer of data over the AVR's
+ * SPI ports.
+ *
+ * \note This file should not be included directly. It is automatically included as needed by the SPI driver
+ * dispatch header located in LUFA/Drivers/Peripheral/SPI.h.
+ *
+ * \code
+ * // Initialize the SPI driver before first use
+ * SPI_Init(&SPIC,
+ * SPI_SPEED_FCPU_DIV_2 | SPI_ORDER_MSB_FIRST | SPI_SCK_LEAD_FALLING |
+ * SPI_SAMPLE_TRAILING | SPI_MODE_MASTER);
+ *
+ * // Send several bytes, ignoring the returned data
+ * SPI_SendByte(&SPIC, 0x01);
+ * SPI_SendByte(&SPIC, 0x02);
+ * SPI_SendByte(&SPIC, 0x03);
+ *
+ * // Receive several bytes, sending a dummy 0x00 byte each time
+ * uint8_t Byte1 = SPI_ReceiveByte(&SPIC);
+ * uint8_t Byte2 = SPI_ReceiveByte(&SPIC);
+ * uint8_t Byte3 = SPI_ReceiveByte(&SPIC);
+ *
+ * // Send a byte, and store the received byte from the same transaction
+ * uint8_t ResponseByte = SPI_TransferByte(&SPIC, 0xDC);
+ * \endcode
+ *
+ * @{
+ */
+
+#ifndef __SPI_XMEGA_H__
+#define __SPI_XMEGA_H__
+
+ /* Includes: */
+ #include "../../../Common/Common.h"
+
+ /* Enable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ extern "C" {
+ #endif
+
+ /* Preprocessor Checks: */
+ #if !defined(__INCLUDE_FROM_SPI_H)
+ #error Do not include this file directly. Include LUFA/Drivers/Peripheral/SPI.h instead.
+ #endif
+
+ /* Private Interface - For use in library only: */
+ #if !defined(__DOXYGEN__)
+ /* Macros: */
+ #define SPI_USE_DOUBLESPEED SPI_CLK2X_bm
+ #endif
+
+ /* Public Interface - May be used in end-application: */
+ /* Macros: */
+ /** \name SPI Prescaler Configuration Masks */
+ //@{
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 2. */
+ #define SPI_SPEED_FCPU_DIV_2 SPI_USE_DOUBLESPEED
+
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 4. */
+ #define SPI_SPEED_FCPU_DIV_4 0
+
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 8. */
+ #define SPI_SPEED_FCPU_DIV_8 (SPI_USE_DOUBLESPEED | (1 << SPI_PRESCALER_gp))
+
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 16. */
+ #define SPI_SPEED_FCPU_DIV_16 (1 << SPI_PRESCALER_gp)
+
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 32. */
+ #define SPI_SPEED_FCPU_DIV_32 (SPI_USE_DOUBLESPEED | (2 << SPI_PRESCALER_gp))
+
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 64. */
+ #define SPI_SPEED_FCPU_DIV_64 (2 << SPI_PRESCALER_gp)
+
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 128. */
+ #define SPI_SPEED_FCPU_DIV_128 (3 << SPI_PRESCALER_gp)
+ //@}
+
+ /** \name SPI SCK Polarity Configuration Masks */
+ //@{
+ /** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the rising edge. */
+ #define SPI_SCK_LEAD_RISING 0
+
+ /** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the falling edge. */
+ #define SPI_SCK_LEAD_FALLING SPI_MODE1_bm
+ //@}
+
+ /** \name SPI Sample Edge Configuration Masks */
+ //@{
+ /** SPI data sample mode mask for \ref SPI_Init(). Indicates that the data should sampled on the leading edge. */
+ #define SPI_SAMPLE_LEADING 0
+
+ /** SPI data sample mode mask for \ref SPI_Init(). Indicates that the data should be sampled on the trailing edge. */
+ #define SPI_SAMPLE_TRAILING SPI_MODE0_bm
+ //@}
+
+ /** \name SPI Data Ordering Configuration Masks */
+ //@{
+ /** SPI data order mask for \ref SPI_Init(). Indicates that data should be shifted out MSB first. */
+ #define SPI_ORDER_MSB_FIRST 0
+
+ /** SPI data order mask for \ref SPI_Init(). Indicates that data should be shifted out LSB first. */
+ #define SPI_ORDER_LSB_FIRST SPI_DORD_bm
+ //@}
+
+ /** \name SPI Mode Configuration Masks */
+ //@{
+ /** SPI mode mask for \ref SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */
+ #define SPI_MODE_SLAVE 0
+
+ /** SPI mode mask for \ref SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */
+ #define SPI_MODE_MASTER SPI_MASTER_bm
+ //@}
+
+ /* Inline Functions: */
+ /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other
+ * SPI routines.
+ *
+ * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device.
+ * \param[in] SPIOptions SPI Options, a mask consisting of one of each of the \c SPI_SPEED_*,
+ * \c SPI_SCK_*, \c SPI_SAMPLE_*, \c SPI_ORDER_* and \c SPI_MODE_* masks.
+ */
+ static inline void SPI_Init(SPI_t* const SPI,
+ const uint8_t SPIOptions)
+ {
+ SPI->CTRL = (SPIOptions | SPI_ENABLE_bm);
+ }
+
+ /** Turns off the SPI driver, disabling and returning used hardware to their default configuration.
+ *
+ * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device.
+ */
+ static inline void SPI_Disable(SPI_t* const SPI)
+ {
+ SPI->CTRL &= ~SPI_ENABLE_bm;
+ }
+
+ /** Retrieves the currently selected SPI mode, once the SPI interface has been configured.
+ *
+ * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device.
+ *
+ * \return \ref SPI_MODE_MASTER if the interface is currently in SPI Master mode, \ref SPI_MODE_SLAVE otherwise
+ */
+ static inline uint8_t SPI_GetCurrentMode(SPI_t* const SPI) ATTR_ALWAYS_INLINE;
+ static inline uint8_t SPI_GetCurrentMode(SPI_t* const SPI)
+ {
+ return (SPI->CTRL & SPI_MASTER_bm);
+ }
+
+ /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.
+ *
+ * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device.
+ * \param[in] Byte Byte to send through the SPI interface.
+ *
+ * \return Response byte from the attached SPI device.
+ */
+ static inline uint8_t SPI_TransferByte(SPI_t* const SPI,
+ const uint8_t Byte) ATTR_ALWAYS_INLINE;
+ static inline uint8_t SPI_TransferByte(SPI_t* const SPI,
+ const uint8_t Byte)
+ {
+ SPI->DATA = Byte;
+ while (!(SPI->STATUS & SPI_IF_bm));
+ return SPI->DATA;
+ }
+
+ /** 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,out] SPI Pointer to the base of the SPI peripheral within the device.
+ * \param[in] Byte Byte to send through the SPI interface.
+ */
+ static inline void SPI_SendByte(SPI_t* const SPI,
+ const uint8_t Byte) ATTR_ALWAYS_INLINE;
+ static inline void SPI_SendByte(SPI_t* const SPI,
+ const uint8_t Byte)
+ {
+ SPI->DATA = Byte;
+ while (!(SPI->STATUS & SPI_IF_bm));
+ }
+
+ /** Sends a dummy byte through the SPI interface, blocking until the transfer is complete. The response
+ * byte from the attached SPI device is returned.
+ *
+ * \param[in,out] SPI Pointer to the base of the SPI peripheral within the device.
+ *
+ * \return The response byte from the attached SPI device.
+ */
+ static inline uint8_t SPI_ReceiveByte(SPI_t* const SPI) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
+ static inline uint8_t SPI_ReceiveByte(SPI_t* const SPI)
+ {
+ SPI->DATA = 0;
+ while (!(SPI->STATUS & SPI_IF_bm));
+ return SPI->DATA;
+ }
+
+ /* Disable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ }
+ #endif
+
+#endif
+
+/** @} */
+
|