/*********************************************************************************
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* Copyright: (C) 2018 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: led.c
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* Description: This file is used to control RGB 3-colours LED
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*
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* pi@raspberrypi:~ $ gpio readall show BCM and wPi pinmap
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*
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* LED BCM wPi
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* G ---- GPIO.13 ---- GPIO.23
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* R ---- GPIO.19 ---- GPIO.24
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* B ---- GPIO.26 ---- GPIO.25
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* I ---- GND ----
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*
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* Version: 1.0.0(2018/10/14)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2018/10/14 12:13:26"
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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 "led.h"
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#define msleep(x) usleep( 1000*(x) )
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#define DELAY 500
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int main(int argc, char *argv[])
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{
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init_led();
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while(1)
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{
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turn_led(LED_R, ON);
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msleep(DELAY);
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turn_led(LED_R, OFF);
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msleep(DELAY);
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turn_led(LED_G, ON);
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msleep(DELAY);
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turn_led(LED_G, OFF);
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msleep(DELAY);
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turn_led(LED_B, ON);
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msleep(DELAY);
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turn_led(LED_B, OFF);
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msleep(DELAY);
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}
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return 0;
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}
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#ifdef CONFIG_USE_WIRINGPI
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#include <wiringPi.h>
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void init_led(void)
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{
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int i;
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wiringPiSetup();
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for(i=0; i<LED_MAX; i++)
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{
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pinMode( led_gpio[i], OUTPUT );
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}
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}
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int turn_led(int which, int cmd)
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{
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if( which<0 || which>=LED_MAX )
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return -1;
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if( OFF == cmd )
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digitalWrite (led_gpio[which], LOW);
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else
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digitalWrite (led_gpio[which], HIGH);
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return 0;
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}
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#else /* use libgpiod library */
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#include <gpiod.h>
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#if 0 /* Use libgpiod lowlevel API */
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struct gpiod_chip* chip;
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void init_led(void)
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{
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chip = gpiod_chip_open_by_name("gpiochip0");
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if( !chip )
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{
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printf("gpiod open chip failure, maybe you need running as root\n");
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exit(1);
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}
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}
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int turn_led(int which, int cmd)
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{
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int rv = 0;
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struct gpiod_line* line;
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line = gpiod_chip_get_line(chip, led_gpio[which]);
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if( !line )
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{
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rv = -2;
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}
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gpiod_line_request_output(line, "led", 0);
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if( OFF == cmd )
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{
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gpiod_line_set_value(line, 0);
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}
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else
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{
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gpiod_line_set_value(line, 1);
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}
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}
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#else /* use libgpiod ctxless high level API */
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void init_led(void)
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{
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}
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void gpiod_ctxless_cb(void *data)
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{
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sleep(1);
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}
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int turn_led(int which, int cmd)
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{
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if( OFF == cmd )
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gpiod_ctxless_set_value("gpiochip0", led_gpio[which], 0, false, "led", gpiod_ctxless_cb, NULL);
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else
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gpiod_ctxless_set_value("gpiochip0", led_gpio[which], 1, false, "led", gpiod_ctxless_cb, NULL);
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}
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#endif
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#endif
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