gpio.h

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>

#include "types.h"
#include "log.h"

#define GPIO_PATH "/sys/class/gpio/"
#define MIN_BUTTON_TIME 100000


typedef enum direction {
    IN,
    OUT
} rl_direction;

typedef enum edge {
    NONE,   
    RISING, 
    FALLING,
    BOTH    
} rl_edge;

// gpio unexport
int gpio_unexport(int num);

// gpio export
int gpio_export(int num);

// set direction
int gpio_dir(int num, rl_direction dir);

// gpio value
int gpio_set_value(int num, int val);
int gpio_get_value(int num);

// interrupt
int gpio_interrupt(int num, rl_edge e);
int gpio_wait_interrupt(int num, int timeout); // timout<0 -> infinite