- /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 16. */\r
- #define SPI_SPEED_FCPU_DIV_16 (1 << SPR0)\r
-\r
- /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 32. */\r
- #define SPI_SPEED_FCPU_DIV_32 (SPI_USE_DOUBLESPEED | (1 << SPR1))\r
-\r
- /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 64. */\r
- #define SPI_SPEED_FCPU_DIV_64 (SPI_USE_DOUBLESPEED | (1 << SPR1) | (1 << SPR0))\r
-\r
- /** SPI prescaler mask for SPI_Init(). Divides the system clock by a factor of 128. */\r
- #define SPI_SPEED_FCPU_DIV_128 ((1 << SPR1) | (1 << SPR0))\r
-\r
- /* Inline Functions: */\r
- /** Initializes the SPI subsystem, ready for transfers. Must be called before calling any other\r
- * SPI routines.\r
- *\r
- * \param[in] PrescalerMask Prescaler mask to set the SPI clock speed\r
- * \param[in] Master If true, sets the SPI system to use master mode, slave if false\r
- */\r
- static inline void SPI_Init(const uint8_t PrescalerMask, const bool Master)\r
- {\r
- DDRB |= ((1 << 1) | (1 << 2));\r
- PORTB |= ((1 << 0) | (1 << 3));\r
- \r
- SPCR = ((1 << SPE) | (Master << MSTR) | (1 << CPOL) | (1 << CPHA) |\r
- (PrescalerMask & ~SPI_USE_DOUBLESPEED));\r
- \r
- if (PrescalerMask & SPI_USE_DOUBLESPEED)\r
- SPSR |= (1 << SPI2X);\r
- else\r
- SPSR &= ~(1 << SPI2X);\r
- }\r
- \r
- /** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */\r
- static inline void SPI_ShutDown(void)\r
- {\r
- DDRB &= ~((1 << 1) | (1 << 2));\r
- PORTB &= ~((1 << 0) | (1 << 3));\r
- \r
- SPCR = 0;\r
- SPSR = 0;\r
- }\r
- \r
- /** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.\r
- *\r
- * \param[in] Byte Byte to send through the SPI interface\r
- *\r
- * \return Response byte from the attached SPI device\r
- */\r
- static inline uint8_t SPI_TransferByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;\r
- static inline uint8_t SPI_TransferByte(const uint8_t Byte)\r
- {\r
- SPDR = Byte;\r
- while (!(SPSR & (1 << SPIF)));\r
- return SPDR;\r
- }\r
-\r
- /** Sends a byte through the SPI interface, blocking until the transfer is complete. The response\r
- * byte sent to from the attached SPI device is ignored.\r
- *\r
- * \param[in] Byte Byte to send through the SPI interface\r
- */\r
- static inline void SPI_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;\r
- static inline void SPI_SendByte(const uint8_t Byte)\r
- {\r
- SPDR = Byte;\r
- while (!(SPSR & (1 << SPIF)));\r
- }\r
-\r
- /** Sends a dummy byte through the SPI interface, blocking until the transfer is complete. The response\r
- * byte from the attached SPI device is returned.\r
- *\r
- * \return The response byte from the attached SPI device\r
- */\r
- static inline uint8_t SPI_ReceiveByte(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;\r
- static inline uint8_t SPI_ReceiveByte(void)\r
- {\r
- SPDR = 0x00;\r
- while (!(SPSR & (1 << SPIF)));\r
- return SPDR;\r
- }\r
-\r
- /* Disable C linkage for C++ Compilers: */\r
- #if defined(__cplusplus)\r
- }\r