Board.h File Reference

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Classes
class	BOARD

Macros
#define	GPIO_PIN(port, pin)   (((port) << 4) | (pin))
#define	GPIO_REG(pin)   ((pin) >> 4)
#define	GPIO_MASK(pin)   _BV((pin) & 0xf)
#define	GPIO_ATOMIC_MAX   GPIO_PIN(0x40,0)
#define	GPIO_ATOMIC(expr)

Macro Definition Documentation

#define GPIO_ATOMIC

(

expr

)

Value:

do {                                                            \
    if (PIN < GPIO_ATOMIC_MAX) {                                \
      expr;                                                     \
    }                                                           \
    else {                                                      \
      uint8_t sreg = SREG;                                      \
      __asm__ __volatile__("cli" ::: "memory");                 \
      expr;                                                     \
      SREG = sreg;                                              \
      __asm__ __volatile__("" ::: "memory");                    \
    }                                                           \
  } while (0)

Forces given expression to be atomic. Higher port addresses cannot be accessed with a single instruction and require disabling of interrupts to become atomic.

Parameters

[in]

expr

expression to be atomic.

Definition at line 51 of file Board.h.

#define GPIO_ATOMIC_MAX   GPIO_PIN(0x40,0)

Maximum port control register address for atomic bit instructions.

Definition at line 43 of file Board.h.

#define GPIO_MASK

(

pin

)

_BV((pin) & 0xf)

Return pin mask from board pin value.

Returns

pin mask

Definition at line 40 of file Board.h.

#define GPIO_PIN	(		port,
			pin
	)		(((port) << 4) | (pin))

Board pin values are bit-pointers and constructed from port control register address and pin bit position.

Parameters

[in]	port	control register address.
[in]	pin	pin bit position in control register.

Definition at line 28 of file Board.h.

#define GPIO_REG

(

pin

)

((pin) >> 4)

Return port control register address from board pin value.

Returns

io port address

Definition at line 34 of file Board.h.