/*********************************************************************************
 *      Copyright:  (C) 2024 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  infrared.h
 *    Description:  This file is HC-SR501 infrared sensor code
 *
 * Pin connection:
 *               HC-SR501 Module          IGKBoard-IMX6ULL
 *                  VCC       <----->      5V
 *                  I/O       <----->      #Pin37(GPIO5_IO09)
 *                  GND       <----->      GND
 *
 ********************************************************************************/

#ifndef  _INFRARED_H_
#define  _INFRARED_H_

#include "gpiod.h"

/* infrared number */
enum
{
    IR1 = 0,
    IR_CNT,
};

enum
{
    IR_ACTIVE_LOW,  /* Low level active */
    IR_ACTIVE_HIGH, /* High level active */
};

/* infrared hardware information */
typedef struct infrared_s
{
    const char               *name;      /* infrared name  */
    int                       chip_num;  /* infrared connect chip */
    int                       gpio_num;  /* infrared connect line */
    int                       active;    /* infrared active level */
    struct gpiod_line_request *request;  /* libgpiod gpio request handler */
} infrared_t;

/* infrared structure */
typedef struct infrareds_s
{
    infrared_t          *infrareds;/* infrared pointer to infrareds_info */
    int                  count; /* infrared count */
} infrareds_t;

/* initial infrareds */
int init_infrared(void);

/* terminate infrareds   */
int term_infrared(void);

/* detect infrareds */
int detect_infrared(int which);

#endif