252 lines
9.7 KiB
C
252 lines
9.7 KiB
C
|
/*
|
||
|
|
LUFA Library
|
||
|
|
Copyright (C) Dean Camera, 2019.
|
||
|
|
|
||
|
|
dean [at] fourwalledcubicle [dot] com
|
||
|
|
www.lufa-lib.org
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
Copyright 2019 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 disclaims 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_SPI_XMEGA_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) ATTR_NON_NULL_PTR_ARG(1);
|
||
|
|
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) ATTR_NON_NULL_PTR_ARG(1);
|
||
|
|
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 ATTR_NON_NULL_PTR_ARG(1);
|
||
|
|
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 ATTR_NON_NULL_PTR_ARG(1);
|
||
|
|
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 ATTR_NON_NULL_PTR_ARG(1);
|
||
|
|
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 ATTR_NON_NULL_PTR_ARG(1);
|
||
|
|
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
|
||
|
|
|
||
|
|
/** @} */
|
||
|
|
|