/*********************************************************************************
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* Copyright: (C) 2021 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: relay.c
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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 Raspberry Pi Board
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* VCC <-----> 5V
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* I <-----> #Pin16(BCM GPIO23)
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* GND <-----> GND
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*
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* System install:
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* sudo apt install -y libgpiod-dev gpiod
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*
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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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#define ON 1
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#define OFF 0
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/* relay code */
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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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/* Relay hardware information */
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typedef struct relay_info_s
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{
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const char *name; /* Relay name */
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int gpio; /* Relay BCM pin number */
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int active;/* Relay active GPIO level: 0->low 1->high */
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struct gpiod_line *line; /* libgpiod line */
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} relay_info_t;
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/* Relay API context */
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typedef struct relay_ctx_s
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{
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struct gpiod_chip *chip;
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relay_info_t *relay;
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int count;
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} relay_ctx_t;
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extern int init_relay(relay_ctx_t *ctx);
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extern int term_relay(relay_ctx_t *ctx);
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extern int turn_relay(int which, int cmd);
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#endif /* ----- #ifndef _RELAY_H_ ----- */
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