/*********************************************************************************
 *      Copyright:  (C) 2018 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  led.c
 *    Description:  This file is used to control RGB 3-colours LED
 *
 *     pi@raspberrypi:~ $ gpio readall show BCM and wPi pinmap  
 *
 *                 LED      BCM           wPi 
 *                  G ---- GPIO.13  ---- GPIO.23
 *                  R ---- GPIO.19  ---- GPIO.24    
 *                  B ---- GPIO.26  ---- GPIO.25
 *                  I ---- GND      ----
 *                 
 *        Version:  1.0.0(2018/10/14)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "2018/10/14 12:13:26"
 *                 
 ********************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <time.h>
#include <errno.h>

#include "led.h"

#define msleep(x) usleep( 1000*(x) )
#define DELAY     500

int main(int argc, char *argv[])
{
	init_led();

	while(1)
	{
		turn_led(LED_R, ON);
		msleep(DELAY);
		turn_led(LED_R, OFF);
		msleep(DELAY);

		turn_led(LED_G, ON);
		msleep(DELAY);
		turn_led(LED_G, OFF);
		msleep(DELAY);

		turn_led(LED_B, ON);
		msleep(DELAY);
		turn_led(LED_B, OFF);
		msleep(DELAY);
	}

        return 0;
}

#ifdef CONFIG_USE_WIRINGPI
#include <wiringPi.h>

void init_led(void)
{
	int         i;

       	wiringPiSetup();

	for(i=0; i<LED_MAX; i++)
	{
	       	pinMode( led_gpio[i], OUTPUT );
	}
}

int turn_led(int which, int cmd)
{
	if( which<0 || which>=LED_MAX )
		return -1;


	if( OFF == cmd )
	       	digitalWrite (led_gpio[which], LOW);
	else
	       	digitalWrite (led_gpio[which], HIGH);

	return 0;
}

#else /* use libgpiod library */

#include <gpiod.h>

#if 1 /* Use libgpiod lowlevel API */

struct gpiod_chip* chip;

void init_led(void)
{
	chip = gpiod_chip_open_by_name("gpiochip0");
	if( !chip )
	{
		printf("gpiod open chip failure, maybe you need running as root\n");
		exit(1);
	}
}

int turn_led(int which, int cmd)
{
	int                rv = 0;
	struct gpiod_line* line;
       
	line = gpiod_chip_get_line(chip, led_gpio[which]);
	if( !line )
	{
		rv = -2;
	}
       
	gpiod_line_request_output(line, "led", 0);

	if( OFF == cmd )
	{
		gpiod_line_set_value(line, 0);
	}
	else
	{
		gpiod_line_set_value(line, 1);
	}
}


#else /* use libgpiod ctxless high level API */
void init_led(void)
{

}

void gpiod_ctxless_cb(void *data)
{
	sleep(1);
}

int turn_led(int which, int cmd)
{
	if( OFF == cmd )
		gpiod_ctxless_set_value("gpiochip0", led_gpio[which], 0, false, "led", gpiod_ctxless_cb, NULL);
	else
		gpiod_ctxless_set_value("gpiochip0", led_gpio[which], 1, false, "led", gpiod_ctxless_cb, NULL);
}
#endif


#endif