/*********************************************************************************
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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: infrared.h
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* Description: This file is HC-SR501 infrared sensor code
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*
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* Pin connection:
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* HC-SR501 Module IGKBoard-IMX6ULL
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* VCC <-----> 5V
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* I/O <-----> #Pin22(GPIO3_IO23)
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* GND <-----> GND
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*
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********************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <string.h>
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#include <time.h>
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#include <errno.h>
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#include <signal.h>
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#include <getopt.h>
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#include <libgen.h>
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#include "infrared.h"
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int g_stop = 0;
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static inline void msleep(unsigned long ms);
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void sig_handler(int signum);
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static void program_usage(const char *progname)
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{
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printf("Usage: %s [OPTION]...\n", progname);
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printf(" This is infrared detect program. \n");
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printf(" -d[device ] Specify infrared device, such as 0\n");
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printf(" -h[help ] Display this help information\n");
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printf("\n");
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printf("%s program Version v1.0.0\n", progname);
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printf("Copyright (C) 2023 LingYun IoT System Studio.\n");
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return;
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}
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int main(int argc, char **argv)
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{
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char *progname=NULL;
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int rv;
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int which = -1;
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struct option long_options[] = {
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{"device", required_argument, NULL, 'd'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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progname = basename(argv[0]);
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/* Parser the command line parameters */
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while ((rv = getopt_long(argc, argv, "d:h", long_options, NULL)) != -1)
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{
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switch (rv)
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{
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case 'd': /* Set infrared number, such as 0...max */
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which = atoi(optarg);
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break;
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case 'h': /* Get help information */
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program_usage(progname);
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return 0;
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default:
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break;
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}
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}
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if( (rv=init_infrared()) < 0 )
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{
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printf("initial infrared gpio failure, rv=%d\n", rv);
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return 1;
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}
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signal(SIGINT, sig_handler);
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signal(SIGTERM, sig_handler);
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while( !g_stop )
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{
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rv = detect_infrared(which);
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printf("Infrared[%d] monitor: %s\n", which, rv ? "Someone is closing!":"No one nearby!");
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sleep(1);
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}
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term_infrared();
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return 0;
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}
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/*+-------------------------------------+
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*| Infrared API based on libgpiod v2.0 |
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*+-------------------------------------+*/
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static infrared_t ir_info[IR_CNT] =
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{
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{"IR1", 2, 23, IR_ACTIVE_HIGH, NULL}, /* #Pin22, GPIO3_IO23 on chip2 line 23, active high */
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};
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/* infrareds context */
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static infrareds_t infrareds =
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{
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.infrareds = ir_info,
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.count = IR_CNT,
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};
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int init_infrared(void)
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{
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infrared_t *infrared;
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int i, rv = 0;
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char chip_dev[32];
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struct gpiod_chip *chip; /* gpio chip */
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struct gpiod_line_settings *settings; /* gpio direction, bias, active_low, value */
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struct gpiod_line_config *line_cfg; /* gpio line */
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struct gpiod_request_config *req_cfg; /* gpio consumer, it can be NULL */
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/* defined in libgpiod-2.0/lib/line-settings.c:
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struct gpiod_line_settings {
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enum gpiod_line_direction direction;
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enum gpiod_line_edge edge_detection;
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enum gpiod_line_drive drive;
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enum gpiod_line_bias bias;
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bool active_low;
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enum gpiod_line_clock event_clock;
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long debounce_period_us;
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enum gpiod_line_value output_value;
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};
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*/
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settings = gpiod_line_settings_new();
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if (!settings)
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{
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printf("unable to allocate line settings\n");
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rv = -2;
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goto cleanup;
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}
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/* defined in libgpiod-2.0/lib/line-config.c
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struct gpiod_line_config {
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struct per_line_config line_configs[LINES_MAX];
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size_t num_configs;
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enum gpiod_line_value output_values[LINES_MAX];
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size_t num_output_values;
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struct settings_node *sref_list;
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};
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*/
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line_cfg = gpiod_line_config_new();
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if (!line_cfg)
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{
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printf("unable to allocate the line config structure");
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rv = -2;
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goto cleanup;
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}
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/* defined in libgpiod-2.0/lib/request-config.c:
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struct gpiod_request_config {
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char consumer[GPIO_MAX_NAME_SIZE];
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size_t event_buffer_size;
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};
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*/
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req_cfg = gpiod_request_config_new();
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if (!req_cfg)
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{
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printf("unable to allocate the request config structure");
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rv = -2;
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goto cleanup;
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}
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for(i=0; i<infrareds.count; i++)
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{
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infrared = &infrareds.infrareds[i];
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snprintf(chip_dev, sizeof(chip_dev), "/dev/gpiochip%d", infrared->chip_num);
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chip = gpiod_chip_open(chip_dev);
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if( !chip )
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{
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printf("open gpiochip failure, maybe you need running as root\n");
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rv = -3;
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goto cleanup;
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}
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/* Set as input direction */
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gpiod_line_settings_reset(settings);
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gpiod_line_settings_set_direction(settings, GPIOD_LINE_DIRECTION_INPUT);
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/* set gpio line */
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gpiod_line_config_reset(line_cfg);
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gpiod_line_config_add_line_settings(line_cfg, &infrared->gpio_num, 1, settings);
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/* Can be NULL for default settings. */
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gpiod_request_config_set_consumer(req_cfg, infrared->name);
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/* Request a set of lines for exclusive usage. */
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infrared->request = gpiod_chip_request_lines(chip, req_cfg, line_cfg);
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gpiod_chip_close(chip);
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//printf("request %5s infrared[%d] for gpio output okay\n", infrared->name, infrared->gpio);
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}
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cleanup:
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if( rv< 0 )
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term_infrared();
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if( line_cfg )
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gpiod_line_config_free(line_cfg);
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if( req_cfg )
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gpiod_request_config_free(req_cfg);
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if( settings )
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gpiod_line_settings_free(settings);
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return rv;
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}
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int term_infrared(void)
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{
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infrared_t *infrared;
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int i;
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printf("terminate infrared gpios\n");
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for(i=0; i<infrareds.count; i++)
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{
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infrared = &infrareds.infrareds[i];
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if( infrared->request )
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{
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gpiod_line_request_release(infrared->request);
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}
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}
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return 0;
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}
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int detect_infrared(int which)
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{
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int rv = 0;
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infrared_t *infrared;
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if( which<0 || which>=infrareds.count )
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{
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printf("Invalid input arguments\n");
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return 0;
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}
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infrared = &infrareds.infrareds[which];
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return gpiod_line_request_get_value(infrared->request, infrared->gpio_num)==infrared->active ? 1 : 0;
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}
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/*+-------------------------------+
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*| Misc functions API |
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*+-------------------------------+*/
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static inline void msleep(unsigned long ms)
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{
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struct timespec cSleep;
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unsigned long ulTmp;
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cSleep.tv_sec = ms / 1000;
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if (cSleep.tv_sec == 0)
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{
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ulTmp = ms * 10000;
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cSleep.tv_nsec = ulTmp * 100;
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}
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else
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{
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cSleep.tv_nsec = 0;
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}
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nanosleep(&cSleep, 0);
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return ;
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}
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void sig_handler(int signum)
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{
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switch( signum )
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{
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case SIGINT:
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case SIGTERM:
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g_stop = 1;
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default:
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break;
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}
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return ;
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}
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