/*
LUFA Library
- Copyright (C) Dean Camera, 2011.
+ Copyright (C) Dean Camera, 2013.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
- Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2013 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
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
- The author disclaim all warranties with regard to this
+ 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
* // Send a byte, and store the received byte from the same transaction
* uint8_t ResponseByte = SPI_TransferByte(0xDC);
* \endcode
- *
+ *
* @{
*/
/* Macros: */
/** \name SPI Prescaler Configuration Masks */
//@{
- /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 2. */
+ /** 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 \c SPI_Init(). Divides the system clock by a factor of 4. */
+ /** 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 \c SPI_Init(). Divides the system clock by a factor of 8. */
+ /** 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 << SPR0))
- /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 16. */
+ /** SPI prescaler mask for \ref SPI_Init(). Divides the system clock by a factor of 16. */
#define SPI_SPEED_FCPU_DIV_16 (1 << SPR0)
- /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 32. */
+ /** 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 | (1 << SPR1))
- /** SPI prescaler mask for \c SPI_Init(). Divides the system clock by a factor of 64. */
+ /** SPI prescaler mask for \ref 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 \c SPI_Init(). Divides the system clock by a factor of 128. */
+ /** SPI prescaler mask for \ref 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 \c SPI_Init(). Indicates that the SCK should lead on the rising edge. */
+ /** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the rising edge. */
#define SPI_SCK_LEAD_RISING (0 << CPOL)
- /** SPI clock polarity mask for \c SPI_Init(). Indicates that the SCK should lead on the falling edge. */
+ /** SPI clock polarity mask for \ref 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 \c SPI_Init(). Indicates that the data should sampled on the leading edge. */
+ /** SPI data sample mode mask for \ref SPI_Init(). Indicates that the data should sampled on the leading edge. */
#define SPI_SAMPLE_LEADING (0 << CPHA)
- /** SPI data sample mode mask for \c SPI_Init(). Indicates that the data should be sampled on the trailing edge. */
+ /** SPI data sample mode mask for \ref 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 \c SPI_Init(). Indicates that data should be shifted out MSB first. */
+ /** SPI data order mask for \ref SPI_Init(). Indicates that data should be shifted out MSB first. */
#define SPI_ORDER_MSB_FIRST (0 << DORD)
- /** SPI data order mask for \c SPI_Init(). Indicates that data should be shifted out LSB first. */
+ /** SPI data order mask for \ref SPI_Init(). Indicates that data should be shifted out LSB first. */
#define SPI_ORDER_LSB_FIRST (1 << DORD)
//@}
-
+
/** \name SPI Mode Configuration Masks */
//@{
- /** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */
+ /** SPI mode mask for \ref SPI_Init(). Indicates that the SPI interface should be initialized into slave mode. */
#define SPI_MODE_SLAVE (0 << MSTR)
- /** SPI mode mask for \c SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */
+ /** SPI mode mask for \ref SPI_Init(). Indicates that the SPI interface should be initialized into master mode. */
#define SPI_MODE_MASTER (1 << MSTR)
//@}
-
+
/* Inline Functions: */
/** Initializes 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 \c SPI_SPEED_*,
* \c SPI_SCK_*, \c SPI_SAMPLE_*, \c SPI_ORDER_* and \c SPI_MODE_* masks.
*/
+ static inline void SPI_Init(const uint8_t SPIOptions);
static inline void SPI_Init(const uint8_t SPIOptions)
{
/* Prevent high rise times on PB.0 (/SS) from forcing a change to SPI slave mode */
}
/** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */
+ static inline void SPI_Disable(void);
static inline void SPI_Disable(void)
{
DDRB &= ~((1 << 1) | (1 << 2));
SPCR = 0;
SPSR = 0;
}
-
+
/** Retrieves the currently selected SPI mode, once the SPI interface has been configured.
*
* \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(void) ATTR_ALWAYS_INLINE;
static inline uint8_t SPI_GetCurrentMode(void)
{
return (SPCR & SPI_MODE_MASTER);
projects / pub / USBasp.git / blobdiff