Macros for Accessing AVR Special Function Registers. More...

#include <inttypes.h>

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Macros
#define	_SFR_ASM_COMPAT 0

#define	_MMIO_BYTE(mem_addr) ((volatile uint8_t )(mem_addr))

#define	_MMIO_WORD(mem_addr) ((volatile uint16_t )(mem_addr))

#define	_MMIO_DWORD(mem_addr) ((volatile uint32_t )(mem_addr))

#define	__SFR_OFFSET 0x20

#define	_SFR_MEM8(mem_addr) _MMIO_BYTE(mem_addr)

#define	_SFR_MEM16(mem_addr) _MMIO_WORD(mem_addr)

#define	_SFR_MEM32(mem_addr) _MMIO_DWORD(mem_addr)

#define	_SFR_IO8(io_addr) _MMIO_BYTE((io_addr) + __SFR_OFFSET)

#define	_SFR_IO16(io_addr) _MMIO_WORD((io_addr) + __SFR_OFFSET)

#define	_SFR_MEM_ADDR(sfr) ((uint16_t) &(sfr))

#define	_SFR_IO_ADDR(sfr) (_SFR_MEM_ADDR(sfr) - __SFR_OFFSET)

#define	_SFR_IO_REG_P(sfr) (_SFR_MEM_ADDR(sfr) < 0x40 + __SFR_OFFSET)

#define	_SFR_ADDR(sfr) _SFR_MEM_ADDR(sfr)

#define	_SFR_BYTE(sfr) _MMIO_BYTE(_SFR_ADDR(sfr))

#define	_SFR_WORD(sfr) _MMIO_WORD(_SFR_ADDR(sfr))

#define	_SFR_DWORD(sfr) _MMIO_DWORD(_SFR_ADDR(sfr))

#define	_VECTOR(N) __vector_ ## N

Bit Manipulation
#define	_BV(bit) (1 << (bit))

IO Register Bit Manipulation
#define	bit_is_set(sfr, bit) (_SFR_BYTE(sfr) & _BV(bit))

#define	bit_is_clear(sfr, bit) (!(_SFR_BYTE(sfr) & _BV(bit)))

#define	loop_until_bit_is_set(sfr, bit) do { } while (bit_is_clear(sfr, bit))

#define	loop_until_bit_is_clear(sfr, bit) do { } while (bit_is_set(sfr, bit))

Detailed Description

Macros for Accessing AVR Special Function Registers.