X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/a7aaa45ec4c3f415bf6073a5cc016635d5ecf77d..071fd8ce536522ca6365580d64cd465e4c18a031:/LUFA/Drivers/Peripheral/SPI.h?ds=sidebyside

diff --git a/LUFA/Drivers/Peripheral/SPI.h b/LUFA/Drivers/Peripheral/SPI.h
index 6c4ac287f..6416ceae6 100644
--- a/LUFA/Drivers/Peripheral/SPI.h
+++ b/LUFA/Drivers/Peripheral/SPI.h
@@ -30,10 +30,7 @@
 
 /** \file
  *
- *  This file is the master dispatch header file for the device-specific SPI driver, for AVRs containing a SPI.
- *
- *  User code should include this file, which will in turn include the correct SPI driver header file for the
- *  currently selected AVR model.
+ *  Hardware SPI subsystem driver for the supported USB AVRs models.
  */
 
 /** \ingroup Group_PeripheralDrivers
@@ -53,18 +50,133 @@
 #ifndef __SPI_H__
 #define __SPI_H__
 
-	/* Macros: */
+	/* Includes: */
+		#include <stdbool.h>
+
+	/* Enable C linkage for C++ Compilers: */
+		#if defined(__cplusplus)
+			extern "C" {
+		#endif
+
+	/* Private Interface - For use in library only: */
 	#if !defined(__DOXYGEN__)
-		#define __INCLUDE_FROM_SPI_H
+		/* Macros: */
+			#define SPI_USE_DOUBLESPEED            (1 << SPE)
 	#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
 
-	/* Includes: */
-		#include "../../Common/Common.h"		
+			/** 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))
+			
+			/** 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)
+
+			/** 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)
+			
+			/** 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: */
+			/** 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 SPI_SPEED_*,
+			 *                         SPI_SCK_*, SPI_SAMPLE_* and SPI_MODE_* masks
+			 */
+			static inline void SPI_Init(const uint8_t SPIOptions)
+			{
+				DDRB  |= ((1 << 1) | (1 << 2));
+				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;
+			}
 
-		#if defined(__AVR32__)
-			#include "AVR32/SPI.h"
-		#elif defined(__AVR__)
-			#include "AVR8/SPI.h"		
+	/* Disable C linkage for C++ Compilers: */
+		#if defined(__cplusplus)
+			}
 		#endif
 		
 #endif