| commit | author | age | ||
| d6b4a7 | 1 | /********************************************************************************* |
| G | 2 | * Copyright: (C) 2021 LingYun IoT System Studio |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Filename: relay.c | |
| 6 | * Description: This file is used to control Relay | |
| 7 | * | |
| 8 | * | |
| 9 | * Pin connection: | |
| 10 | * Relay Module Raspberry Pi Board | |
| 11 | * VCC <-----> 5V | |
| 12 | * I <-----> #Pin16(BCM GPIO23) | |
| 13 | * GND <-----> GND | |
| 14 | * | |
| 15 | * System install: | |
| 16 | * sudo apt install -y libgpiod-dev gpiod | |
| 17 | * | |
| 18 | * | |
| 19 | ********************************************************************************/ | |
| 20 | ||
| 21 | #ifndef _RELAY_H_ | |
| 22 | #define _RELAY_H_ | |
| 23 | ||
| 24 | #define ON 1 | |
| 25 | #define OFF 0 | |
| 26 | ||
| 27 | /* relay code */ | |
| 28 | enum | |
| 29 | { | |
| 30 | RELAY1 = 0, | |
| 31 | RELAY_CNT, | |
| 32 | }; | |
| 33 | ||
| 34 | /* Relay hardware information */ | |
| 35 | typedef struct relay_info_s | |
| 36 | { | |
| 37 | const char *name; /* Relay name */ | |
| 38 | int gpio; /* Relay BCM pin number */ | |
| 39 | int active;/* Relay active GPIO level: 0->low 1->high */ | |
| 40 | struct gpiod_line *line; /* libgpiod line */ | |
| 41 | } relay_info_t; | |
| 42 | ||
| 43 | /* Relay API context */ | |
| 44 | typedef struct relay_ctx_s | |
| 45 | { | |
| 46 | struct gpiod_chip *chip; | |
| 47 | relay_info_t *relay; | |
| 48 | int count; | |
| 49 | } relay_ctx_t; | |
| 50 | ||
| 51 | extern int init_relay(relay_ctx_t *ctx); | |
| 52 | extern int term_relay(relay_ctx_t *ctx); | |
| 53 | extern int turn_relay(int which, int cmd); | |
| 54 | ||
| 55 | #endif /* ----- #ifndef _RELAY_H_ ----- */ | |
| 56 | ||
