CoffeePi/CoffeeCode/led.cpp

/*
 * led.cpp
 *
 *  Created on: Nov 9, 2015
 *      Author: Philipp Hinz
 */
#include <wiringPi.h>
#include <stdio.h>
#include "global.h"
#include "timer.h"
#include "led.h"

timer blinkTimer(&ledBlinkHandler); /**< timer for LED blinking */
bool ledBlink[3]; /**< bool flag for LED blinking */
bool ledBlinkO[3]; /**< bool flag for one time LED blinking */

/**
 * Initializes the LEDs on the CAN Controller board
 */

void initLed(void) {
	pinMode(LED_RED_PIN, OUTPUT);
	pinMode(LED_YELLOW_PIN, OUTPUT);
	pinMode(LED_GREEN_PIN, OUTPUT);
	ledOff(LED_RED);
	ledOff(LED_YELLOW);
	ledOff(LED_GREEN);

	blinkTimer.setDivider(10);
	blinkTimer.start();

	for (int i = 0; i < 3; i++) {
		ledBlink[i] = false;
	}
}

/**
 * Internal function that returns the WiringPi pin to the given LED
 * @param led integer for one of the 3 LEDs
 * @return WiringPi pin
 */

int ledGetPin(int led) {
	switch (led) {
	case LED_RED:
		return LED_RED_PIN;
		break;
	case LED_YELLOW:
		return LED_YELLOW_PIN;
		break;
	case LED_GREEN:
		return LED_GREEN_PIN;
		break;
	default:
		break;
	}
	return -1;
}

/**
 * Set the LED pin to a value.
 * @param led integer for one of the 3 LEDs
 * @param value HIGH or LOW
 */

void ledSet(int led, int value) {
	digitalWrite(ledGetPin(led), value);
}

/**
 * Turn the LED on
 * @param led integer for one of the 3 LEDs
 */

void ledOn(int led) {
	ledSet(led, LOW);
}

/**
 * Turn the LED off (including blinking)
 * @param led integer for one of the 3 LEDs
 */

void ledOff(int led) {
	ledBlinkOff(led);
	ledSet(led, HIGH);
}

/**
 * Toggle the LED
 * @param led integer for one of the 3 LEDs
 */

void ledToggle(int led) {
	int pin = ledGetPin(led);

	if (digitalRead(pin) == HIGH)
		digitalWrite(pin, LOW);
	else
		digitalWrite(pin, HIGH);
}

/**
 * Enable the LED blinking
 * @param led integer for one of the 3 LEDs
 */

void ledBlinkOn(int led) {
	ledBlink[led] = true;
	ledBlinkO[led] = false;
}

/**
 * Enable the LED blinking only once
 * @param led integer for one of the 3 LEDs
 */

void ledBlinkOnce(int led) {
	ledBlink[led] = true;
	ledBlinkO[led] = true;
}

/**
 * Disable the LED blinking
 * @param led integer for one of the 3 LEDs
 */

void ledBlinkOff(int led) {
	ledBlink[led] = false;
	ledBlinkO[led] = false;
}

/**
 * Function for LED blinking, called by a timer
 */

void ledBlinkHandler(void) {
	for (int i = 0; i < 3; i++) {
		if (ledBlink[i] == true) {
			ledToggle(i);
			if (digitalRead(ledGetPin(i)) == HIGH && ledBlinkO[i])
				ledBlink[i] = false;
		}
	}
}