pi_gpio.h

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#ifndef PI_GPIO_H
#define PI_GPIO_H

// Useful constants
#define INPUT   1
#define OUTPUT  0
#define IN      INPUT
#define OUT     OUTPUT

#define HIGH    1
#define LOW     0
#define ON      HIGH
#define OFF     LOW

// Function prototypes 
int gpio_init (unsigned int pin, unsigned int dir);
int gpio_set_int (unsigned int pin, void (*isr) (int), char *mode);
int gpio_clear_int (unsigned int pin);
int gpio_write (unsigned int pin, unsigned int val);
int gpio_read (unsigned int pin);
int gpio_release (unsigned int pin);

// Aliases for pseudo-Arduino compatibility
#define pinMode(pin, dir)                   gpio_init(pin, dir);
#define digitalWrite(pin, val)              gpio_write(pin, val);
#define digitalRead(pin)                    gpio_read(pin);
#define attachInterrupt(pin, isr, mode) gpio_set_int(pin, isr, mode);
#define detachInterrupt(pin)                gpio_clear_int(pin);

#endif