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/*! \defgroup gpio GPIO
* \brief General-purpose input/output
*
* This module defines macros for input/output pins of microcontroller.
* Pin is specified with SET and PIN. SET is letter and PIN is number. Combination
* of SET and PIN specifies hardware pin. You can find it in documentation.
*
* To use this module:
*
* #include "avr-ioe/GPIO.h"
*/
#include <avr/io.h>
#include <stdint.h>
#ifdef IOE_CONFIG
#include <AVR-IOE-CONFIG.h>
#endif /* IOE_CONFIG */
#ifndef _IOE_GPIO_H_
#define _IOE_GPIO_H_
#define __GPIO_JOIN2(TXT1, TXT2) TXT1##TXT2
#define __GPIO_JOIN3(TXT1, TXT2, TXT3) TXT1##TXT2##TXT3
/*! \ingroup gpio
* Return direction of specified pin. Pin is set as output if value is nonzero
* and as input if returned value is zero.
*/
#define gpio_get_mode(SET, PIN) \
__GPIO_JOIN2(DDR, SET) & _BV(__GPIO_JOIN3(DD, SET, PIN))
/*! \ingroup gpio
* Set specified pin as output.
* \param SET -- pin set (letter)
* \param PIN -- pin number (number)
*/
#define gpio_set_out(SET, PIN) \
__GPIO_JOIN2(DDR, SET) |= _BV(__GPIO_JOIN3(DD, SET, PIN))
/*! \ingroup gpio
* Set specific pin as input.
* \param SET -- pin set (letter)
* \param PIN -- pin number (number)
*/
#define gpio_set_in(SET, PIN) \
__GPIO_JOIN2(DDR, SET) &= ~_BV(__GPIO_JOIN3(DD, SET, PIN))
// -- GPIO output section --
/*! \defgroup gpio_out GPIO output
* \ingroup gpio
*/
/*! \ingroup gpio_out
* Set pin high. Pin must be set as output. Undefined behavior for non
* output pins.
* \param SET -- pin set (letter)
* \param PIN -- pin number (number)
*/
#define gpio_set_high(SET, PIN) \
__GPIO_JOIN2(PORT, SET) |= _BV(__GPIO_JOIN3(PORT, SET, PIN))
/*! \ingroup gpio_out
* Set pin low. Pin must be set as output. Undefined behavior for non output pins.
* \param SET -- pin set (letter)
* \param PIN -- pin number (number)
*/
#define gpio_set_low(SET, PIN) \
__GPIO_JOIN2(PORT, SET) &= ~_BV(__GPIO_JOIN3(PORT, SET, PIN))
/*! \ingroup gpio_out
* Set pin according to \a VALUE. Pin must be set as output. Undefined behavior
* for non output pins.
* \warning Use this only if VALUE is runtime variable. For constants are prefered
* gpio_set_high() and gpio_set_low().
* \param SET -- pin set (letter)
* \param PIN -- pin number (number)
* \param VALUE -- runtime variable or boolean expression used in boolean context.
*/
#define gpio_set(SET, PIN, VALUE) \
if (VALUE) \
gpio_set_high(SET, PIN); \
else \
gpio_set_low(SET, PIN);
/*! \ingroup gpio_out
* Set pin opposite state. If it is set as high it will be low and if it is set
* as low it will be high. Pin must be set as output. Undefined behavior for non
* output pins.
* \param SET -- pin set (letter)
* \param PIN -- pin number (number)
*/
#define gpio_set_not(SET, PIN) \
__GPIO_JOIN2(PORT, SET) ^= _BV(__GPIO_JOIN3(PORT, SET, PIN))
// -- GPIO input section --
/*! \defgroup gpio_in GPIO input
* \ingroup gpio
*/
// TODO whole output and switching betwen input and output
#endif /* _IOE_GPIO_H_ */
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