include/regs/xmega_spi.h

Go to the documentation of this file.

#ifndef REGS_XMEGA_SPI_H_INCLUDED
#define REGS_XMEGA_SPI_H_INCLUDED

#include <io.h>



#define SPI_CTRL                        0       //!< Control Register
#define SPI_INTCTRL                     1       //!< Interrupt Control Register
#define SPI_STATUS                      2       //!< Status Register
#define SPI_DATA                        3       //!< Data Register


// \name Bitfields in CTRL
#define SPI_CTRL_PRESCALER_START        0       //!< Clock Prescaler
#define SPI_CTRL_PRESCALER_SIZE         2       //!< Clock Prescaler
#define SPI_CTRL_MODE_START             2       //!< Mode
#define SPI_CTRL_MODE_SIZE              2       //!< Mode
#define SPI_CTRL_MASTER_BIT             4       //!< Master/Slave Select
#define SPI_CTRL_DORD_BIT               5       //!< Data Order
#define SPI_CTRL_ENABLE_BIT             6       //!< Enable
#define SPI_CTRL_CLK2X_BIT              7       //!< Clock Double


// \name Bitfields in INTCTRL
# define SPI_INTCTRL_INTLVL_START       0       //!< Interrupt Level
# define SPI_INTCTRL_INTLVL_SIZE        2       //!< Interrupt Level


// \name Bitfields in INTCTRL
# define SPI_STATUS_WRCOL_BIT           6       //!< Write Collision Flag
# define SPI_STATUS_IF_BIT              7       //!< Interrupt Flag




#define SPI_BIT(name)                                   \
        (1 << SPI_##name##_BIT)

#define SPI_BF(name,value)                              \
        (((value) & ((1 << SPI_##name##_SIZE) - 1))     \
         << SPI_##name##_START)

#define SPI_BFEXT(name,value)                           \
        (((value) >> USART_##name##_START)              \
         & ((1 << USART_##name##_SIZE) - 1))

#define SPI_BFINS(name,value,old)                       \
        (((old) & ~(((1 << SPI_##name##_SIZE) - 1)      \
                    << SPI_##name##_START))             \
         | SPI_BF(name,value))




#define spi_write_reg(spi, reg, value) \
        mmio_write8((void *)((uintptr_t)(spi) + SPI_##reg), value)

#define spi_read_reg(spi, reg) \
        mmio_read8((void *)((uintptr_t)(spi) + SPI_##reg))


#endif /* REGS_XMEGA_SPI_H_INCLUDED */

---