/*********************************************************************************
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* Copyright: (C) 2024 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: relay.h
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* Description: This file is used to control relay
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*
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*
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* Pin connection:
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* Relay Module IGKBoard-IMX6ULL
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* VCC <-----> 5V
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* I <-----> #Pin22 (GPIO3_IO23)
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* GND <-----> GND
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*
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********************************************************************************/
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#ifndef _RELAY_H_
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#define _RELAY_H_
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#include "gpiod.h"
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#define DELAY 300
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#define ON 1
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#define OFF 0
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/* relay number */
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enum
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{
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RELAY1 = 0,
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RELAY_CNT,
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};
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enum
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{
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ACTIVE_HIGH, /* High level will turn relay on */
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ACTIVE_LOW, /* Low level will turn relay on */
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};
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/* relay hardware information */
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typedef struct relay_s
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{
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const char *name; /* relay name */
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int chip_num; /* relay connect chip */
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int gpio_num; /* relay connect line */
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int active; /* relay active level */
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int status; /* relay current status */
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struct gpiod_line_request *request; /* libgpiod gpio request handler */
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} relay_t;
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/* relay structure */
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typedef struct relays_s
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{
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relay_t *relays;/* relay pointer to relays_info */
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int count; /* relay count */
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} relays_t;
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/* initial relays */
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int init_relay(void);
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/* terminate relays */
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int term_relay(void);
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/* turn $which relay ON/OFF */
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int turn_relay(int which, int cmd);
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/* toggle $which relay status */
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int toggle_relay(int which);
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#endif
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