arduino.h File Reference

pin definitions and I/O macros More...

#include <avr/io.h>

Go to the source code of this file.

Defines
#define	_READ(IO)   (IO ## _RPORT & _BV(IO ## _PIN))
	read a pin
#define	_WRITE(IO, v)
	write to a pin
#define	_TOGGLE(IO)   do { IO ## _RPORT = _BV(IO ## _PIN); } while (0)
	toggle a pin
#define	_SET_INPUT(IO)   do { IO ## _DDR &= ~_BV(IO ## _PIN); } while (0)
	set pin as input
#define	_SET_OUTPUT(IO)   do { IO ## _DDR |= _BV(IO ## _PIN); } while (0)
	set pin as output
#define	_GET_INPUT(IO)   ((IO ## _DDR & _BV(IO ## _PIN)) == 0)
	check if pin is an input
#define	_GET_OUTPUT(IO)   ((IO ## _DDR & _BV(IO ## _PIN)) != 0)
	check if pin is an output
#define	READ(IO)   _READ(IO)
	Read a pin wrapper.
#define	WRITE(IO, v)   _WRITE(IO, v)
	Write to a pin wrapper.
#define	TOGGLE(IO)   _TOGGLE(IO)
	toggle a pin wrapper
#define	SET_INPUT(IO)   _SET_INPUT(IO)
	set pin as input wrapper
#define	SET_OUTPUT(IO)   _SET_OUTPUT(IO)
	set pin as output wrapper
#define	GET_INPUT(IO)   _GET_INPUT(IO)
	check if pin is an input wrapper
#define	GET_OUTPUT(IO)   _GET_OUTPUT(IO)
	check if pin is an output wrapper

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Detailed Description

pin definitions and I/O macros

why double up on these macros? see http://gcc.gnu.org/onlinedocs/cpp/Stringification.html

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Define Documentation

#define _WRITE	(	IO,
		v		)

Value:

do { \
  if (v) { IO ## _WPORT |= _BV(IO ## _PIN); }\
  else { IO ## _WPORT &= ~_BV(IO ## _PIN); };\
} while (0)

write to a pin