| 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 | #include <stdio.h> | |
| 22 | #include <stdlib.h> | |
| 23 | #include <unistd.h> | |
| 24 | #include <fcntl.h> | |
| 25 | #include <dirent.h> | |
| 26 | #include <string.h> | |
| 27 | #include <time.h> | |
| 28 | #include <errno.h> | |
| 29 | #include <signal.h> | |
| 30 | #include <getopt.h> | |
| 31 | #include <libgen.h> | |
| 32 | ||
| 33 | #include <gpiod.h> | |
| 34 | #include "logger.h" | |
| 35 | #include "relay.h" | |
| 36 | ||
| 37 | #define DELAY 500 | |
| 38 | ||
| 39 | static relay_info_t relay_info[RELAY_CNT] = | |
| 40 | { | |
| 41 | {"relay1", 23, 1, NULL }, | |
| 42 | }; | |
| 43 | ||
| 44 | int init_relay(relay_ctx_t *ctx) | |
| 45 | { | |
| 46 | int i, rv; | |
| 47 | relay_info_t *relay; | |
| 48 | ||
| 49 | if( !ctx ) | |
| 50 | { | |
| 51 | log_error("Invalid input arguments\n"); | |
| 52 | return -1; | |
| 53 | } | |
| 54 | ||
| 55 | ctx->relay = relay_info; | |
| 56 | ctx->count = RELAY_CNT; | |
| 57 | ||
| 58 | ctx->chip = gpiod_chip_open_by_name("gpiochip0"); | |
| 59 | if( !ctx->chip ) | |
| 60 | { | |
| 61 | log_error("open gpiochip failure, maybe you need running as root\n"); | |
| 62 | return -2; | |
| 63 | } | |
| 64 | ||
| 65 | ||
| 66 | for(i=0; i<ctx->count; i++) | |
| 67 | { | |
| 68 | relay = &ctx->relay[i]; | |
| 69 | ||
| 70 | relay->line = gpiod_chip_get_line(ctx->chip, relay->gpio); | |
| 71 | if( !relay->line ) | |
| 72 | { | |
| 73 | log_error("open gpioline for %s[%d] failed\n", relay->name, relay->gpio); | |
| 74 | rv = -3; | |
| 75 | goto failed; | |
| 76 | } | |
| 77 | ||
| 78 | rv = gpiod_line_request_output(relay->line, relay->name, !relay->active); | |
| 79 | if( rv ) | |
| 80 | { | |
| 81 | log_error("request gpio output for %5s[%d] failed\n", relay->name, relay->gpio); | |
| 82 | rv = -4; | |
| 83 | goto failed; | |
| 84 | } | |
| 85 | ||
| 86 | log_debug("request %s[%d] for gpio output okay\n", relay->name, relay->gpio); | |
| 87 | } | |
| 88 | ||
| 89 | return 0; | |
| 90 | ||
| 91 | failed: | |
| 92 | term_relay(ctx); | |
| 93 | return rv; | |
| 94 | } | |
| 95 | ||
| 96 | int term_relay(relay_ctx_t *ctx) | |
| 97 | { | |
| 98 | int i; | |
| 99 | relay_info_t *relay; | |
| 100 | ||
| 101 | if( !ctx ) | |
| 102 | { | |
| 103 | log_error("Invalid input arguments\n"); | |
| 104 | return -1; | |
| 105 | } | |
| 106 | ||
| 107 | if( !ctx->chip ) | |
| 108 | return 0; | |
| 109 | ||
| 110 | for(i=0; i<ctx->count; i++) | |
| 111 | { | |
| 112 | relay = &ctx->relay[i]; | |
| 113 | ||
| 114 | if( relay->line ) | |
| 115 | gpiod_line_release(relay->line); | |
| 116 | } | |
| 117 | ||
| 118 | gpiod_chip_close(ctx->chip); | |
| 119 | return 0; | |
| 120 | } | |
| 121 | ||
| 122 | ||
| 123 | int turn_relay(int which, int cmd) | |
| 124 | { | |
| 125 | int rv = 0; | |
| 126 | relay_info_t *relay; | |
| 127 | relay_ctx_t ctx; | |
| 128 | ||
| 129 | if( which<0 || which>=RELAY_CNT ) | |
| 130 | { | |
| 131 | log_error("Invalid input arguments\n"); | |
| 132 | return -1; | |
| 133 | } | |
| 134 | ||
| 135 | if( (rv=init_relay(&ctx)) < 0 ) | |
| 136 | { | |
| 137 | log_error("Initial relay failure, rv=%d\n", rv); | |
| 138 | return -2; | |
| 139 | } | |
| 140 | ||
| 141 | relay = &ctx.relay[which]; | |
| 142 | ||
| 143 | if( OFF == cmd ) | |
| 144 | { | |
| 145 | gpiod_line_set_value(relay->line, !relay->active); | |
| 146 | } | |
| 147 | else | |
| 148 | { | |
| 149 | gpiod_line_set_value(relay->line, relay->active); | |
| 150 | } | |
| 151 | ||
| 152 | term_relay(&ctx); | |
| 153 | ||
| 154 | return 0; | |
| 155 | } | |
| 156 | ||
