/*********************************************************************************
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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: led.h
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* Description: This file is used to control RGB 3-colors LED
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*
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*
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* Pin connection:
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* RGB Led Module Raspberry Pi Board
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* R <-----> #Pin33(BCM GPIO13)
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* G <-----> #Pin35(BCM GPIO19)
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* B <-----> #Pin37(BCM GPIO26)
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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 _LEDS_H_
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#define _LEDS_H_
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#define ON 1
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#define OFF 0
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/* Three LEDs code */
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enum
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{
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LED_R = 0,
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LED_G,
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LED_B,
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LED_CNT,
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};
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/* Three LEDs hardware information */
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typedef struct led_info_s
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{
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const char *name; /* RGB 3-color LED name */
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int gpio; /* RGB 3-color LED BCM pin number */
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int active;/* RGB 3-color LED active GPIO level: 0->low 1->high */
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struct gpiod_line *line; /* libgpiod line */
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} led_info_t;
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/* Three LEDs API context */
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typedef struct led_ctx_s
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{
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struct gpiod_chip *chip;
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led_info_t *leds;
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int count;
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} led_ctx_t;
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extern int init_led(led_ctx_t *ctx, int which);
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extern int term_led(led_ctx_t *ctx, int which);
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extern int turn_led(int which, int cmd);
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#endif /* ----- #ifndef _LEDS_H_ ----- */
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