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80 lines
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<div id="projectname">LiquidMenu
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 <span id="projectnumber">1.4.1</span>
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<div id="projectbrief">Menu creation Arduino library for LCDs, wraps LiquidCrystal.</div>
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<div class="title">C_functions_menu.ino</div> </div>
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<div class="contents">
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<p>This example demonstrates how to attach functions to the "lines" in the menu.</p>
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<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * LiquidMenu library - functions_menu.ino</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * This example demonstrates how to attach functions to the</span></div><div class="line"><span class="comment"> * "lines" in the menu.</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * Attaching functions to the different "lines" in the menu makes it</span></div><div class="line"><span class="comment"> * possible to execute an action through the menu (e.g. dimming an LED,</span></div><div class="line"><span class="comment"> * adjusting preferences...). To attach a function to a line you need</span></div><div class="line"><span class="comment"> * to create with signature "void functionName(void)". After creating it,</span></div><div class="line"><span class="comment"> * the function is ready to be attached to a line. To dothat call bool</span></div><div class="line"><span class="comment"> * LiquidLine::attach_function(uint8_t number, void (*function)(void)).</span></div><div class="line"><span class="comment"> * LiquidLine is the line object you wish to attach the function to,</span></div><div class="line"><span class="comment"> * number is the "id" of the function for that line, void (*function)(void)</span></div><div class="line"><span class="comment"> * is just the name of the function without the "()". The "id" of the function</span></div><div class="line"><span class="comment"> * makes possible attaching multiple functions to a single line. An example use</span></div><div class="line"><span class="comment"> * of multiple functions on a single line is for incrementing or decrementing</span></div><div class="line"><span class="comment"> * some value (e.g. dimming an LED). It is convenient to attach all the different</span></div><div class="line"><span class="comment"> * incrementing functions (e.g. increase_brightness(), increase_volume()) to the</span></div><div class="line"><span class="comment"> * different lines (e.g. LED brightness: 5, Sound volume: 10) using the same id</span></div><div class="line"><span class="comment"> * (e.g. 1). Same goes for the decrementing functions (e.g. LED brightness: 5 (line)</span></div><div class="line"><span class="comment"> * with attached function decrease_brightness() (function) with id 2,</span></div><div class="line"><span class="comment"> * Sound volume: 10 (line) with attached function decrease_volume() (function) with id 2).</span></div><div class="line"><span class="comment"> * Similar functions should be attached to their corresponding lines with the same "id",</span></div><div class="line"><span class="comment"> * because then they can be called from the same event (e.g. pressing button "UP"</span></div><div class="line"><span class="comment"> * calls the incrementing function of whatever the focused line is).</span></div><div class="line"><span class="comment"> * This example has a line that shows the current PWM of the LED and lines</span></div><div class="line"><span class="comment"> * that allow a fade or blink loop to be turned ON/OFF and configured.</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * The circuit:</span></div><div class="line"><span class="comment"> * https://github.com/VasilKalchev/LiquidMenu/blob/master/examples/functions_menu/C_functions_menu.png</span></div><div class="line"><span class="comment"> * - LCD RS pin to Arduino pin 12</span></div><div class="line"><span class="comment"> * - LCD E pin to Arduino pin 11</span></div><div class="line"><span class="comment"> * - LCD D4 pin to Arduino pin 5</span></div><div class="line"><span class="comment"> * - LCD D5 pin to Arduino pin 4</span></div><div class="line"><span class="comment"> * - LCD D6 pin to Arduino pin 3</span></div><div class="line"><span class="comment"> * - LCD D7 pin to Arduino pin 2</span></div><div class="line"><span class="comment"> * - LCD R/W pin to ground</span></div><div class="line"><span class="comment"> * - LCD VSS pin to ground</span></div><div class="line"><span class="comment"> * - LCD VDD pin to 5V</span></div><div class="line"><span class="comment"> * - 10k ohm potentiometer: ends to 5V and ground, wiper to LCD V0</span></div><div class="line"><span class="comment"> * - 150 ohm resistor from 5V to LCD Anode</span></div><div class="line"><span class="comment"> * - LCD Cathode to ground</span></div><div class="line"><span class="comment"> * - ----</span></div><div class="line"><span class="comment"> * - Button (left) to Arduino pin A0 and ground</span></div><div class="line"><span class="comment"> * - Button (right) to Arduino pin 7 and ground</span></div><div class="line"><span class="comment"> * - Button (up) to Arduino pin 8 and ground</span></div><div class="line"><span class="comment"> * - Button (down) to Arduino pin 9 and ground</span></div><div class="line"><span class="comment"> * - Button (enter) to Arduino pin 10 and ground</span></div><div class="line"><span class="comment"> * - A PWM controlled device (LED...) to Arduino pin 6</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * Created July 24, 2016</span></div><div class="line"><span class="comment"> * by Vasil Kalchev</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * https://github.com/VasilKalchev/LiquidMenu</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> */</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <LiquidCrystal.h></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="_liquid_menu_8h.html">LiquidMenu.h</a>></span></div><div class="line"><span class="preprocessor">#include "Button.h"</span></div><div class="line"></div><div class="line"><span class="comment">// Pin mapping for the display</span></div><div class="line"><span class="keyword">const</span> byte LCD_RS = 12;</div><div class="line"><span class="keyword">const</span> byte LCD_E = 11;</div><div class="line"><span class="keyword">const</span> byte LCD_D4 = 5;</div><div class="line"><span class="keyword">const</span> byte LCD_D5 = 4;</div><div class="line"><span class="keyword">const</span> byte LCD_D6 = 3;</div><div class="line"><span class="keyword">const</span> byte LCD_D7 = 2;</div><div class="line"><span class="comment">//LCD R/W pin to ground</span></div><div class="line"><span class="comment">//10K potentiometer wiper to VO</span></div><div class="line">LiquidCrystal lcd(LCD_RS, LCD_E, LCD_D4, LCD_D5, LCD_D6, LCD_D7);</div><div class="line"></div><div class="line"><span class="comment">// This variable can be passed to the LiquidMenu object to set the starting screen.</span></div><div class="line"><span class="keyword">const</span> byte startingScreen = 2;</div><div class="line"></div><div class="line"><span class="comment">// Button objects instantiation</span></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * The Button class is not a part of the LiquidMenu library. The first</span></div><div class="line"><span class="comment"> * parameter is the button's pin, the second enables or disables the</span></div><div class="line"><span class="comment"> * internal pullup resistor (not required) and the third is the debounce</span></div><div class="line"><span class="comment"> * time (not required).</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="keyword">const</span> <span class="keywordtype">bool</span> pullup = <span class="keyword">true</span>;</div><div class="line">Button left(A0, pullup);</div><div class="line">Button right(7, pullup);</div><div class="line">Button up(8, pullup);</div><div class="line">Button down(9, pullup);</div><div class="line">Button enter(10, pullup);</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * An enumerator can be used for the callback functions. It sets the number</span></div><div class="line"><span class="comment"> * for similar functions. Later when a function is attached it can be passed</span></div><div class="line"><span class="comment"> * with this enum rather than a magic number.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="comment">// There are two types of functions for this example, one that increases some</span></div><div class="line"><span class="comment">// value and one that decreases it.</span></div><div class="line"><span class="keyword">enum</span> FunctionTypes {</div><div class="line"> increase = 1,</div><div class="line"> decrease = 2,</div><div class="line">};</div><div class="line"></div><div class="line"><span class="comment">// These are the pin definitions and variables for their PWM state.</span></div><div class="line"><span class="keyword">const</span> byte led = 6;</div><div class="line">byte led_level = 0;</div><div class="line"></div><div class="line"><span class="comment">// Variables used for setting "preferences".</span></div><div class="line"><span class="keywordtype">bool</span> isFading = <span class="keyword">false</span>;</div><div class="line"><span class="keywordtype">char</span>* isFading_text;</div><div class="line"><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> fadePeriod = 100;</div><div class="line"><span class="keywordtype">bool</span> isBlinking = <span class="keyword">false</span>;</div><div class="line"><span class="keywordtype">char</span>* isBlinking_text;</div><div class="line"><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blinkPeriod = 1000;</div><div class="line"></div><div class="line"></div><div class="line"><a name="_a0"></a><a class="code" href="class_liquid_line.html">LiquidLine</a> welcome_line1(1, 0, <span class="stringliteral">"LiquidMenu "</span>, <a name="a1"></a><a class="code" href="_liquid_menu_8h.html#a7189c07575adbb1070c89dcd0ab5e272">LIQUIDMENU_VERSION</a>);</div><div class="line"><a class="code" href="class_liquid_line.html">LiquidLine</a> welcome_line2(1, 1, <span class="stringliteral">"Functions ex."</span>);</div><div class="line"><a name="_a2"></a><a class="code" href="class_liquid_screen.html">LiquidScreen</a> welcome_screen(welcome_line1, welcome_line2);</div><div class="line"></div><div class="line"><a class="code" href="class_liquid_line.html">LiquidLine</a> ledTitleLine(6, 0, <span class="stringliteral">"LED"</span>);</div><div class="line"><a class="code" href="class_liquid_line.html">LiquidLine</a> led_line(4, 1, <span class="stringliteral">"Level: "</span>, led_level);</div><div class="line"><a class="code" href="class_liquid_screen.html">LiquidScreen</a> led_screen(ledTitleLine, led_line);</div><div class="line"></div><div class="line"><a class="code" href="class_liquid_line.html">LiquidLine</a> fade_line(0, 0, <span class="stringliteral">"Fade - "</span>, isFading_text);</div><div class="line"><a class="code" href="class_liquid_line.html">LiquidLine</a> fadePeriod_line(0, 1, <span class="stringliteral">"Period: "</span>, fadePeriod, <span class="stringliteral">"ms"</span>);</div><div class="line"><a class="code" href="class_liquid_screen.html">LiquidScreen</a> fade_screen(fade_line, fadePeriod_line);</div><div class="line"></div><div class="line"><a class="code" href="class_liquid_line.html">LiquidLine</a> blink_line(0, 0, <span class="stringliteral">"Blink - "</span>, isBlinking_text);</div><div class="line"><a class="code" href="class_liquid_line.html">LiquidLine</a> blinkPeriod_line(0, 1, <span class="stringliteral">"Period: "</span>, blinkPeriod, <span class="stringliteral">"ms"</span>);</div><div class="line"><a class="code" href="class_liquid_screen.html">LiquidScreen</a> blink_screen(blink_line, blinkPeriod_line);</div><div class="line"></div><div class="line"><a name="_a3"></a><a class="code" href="class_liquid_menu.html">LiquidMenu</a> menu(lcd, startingScreen);</div><div class="line"></div><div class="line"><span class="comment">// Callback functions</span></div><div class="line"><span class="keywordtype">void</span> increase_led_level() {</div><div class="line"> <span class="keywordflow">if</span> (led_level < 225) {</div><div class="line"> led_level += 25;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> led_level = 0;</div><div class="line"> }</div><div class="line"> analogWrite(led, led_level);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> decrease_led_level() {</div><div class="line"> <span class="keywordflow">if</span> (led_level > 25) {</div><div class="line"> led_level -= 25;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> led_level = 250;</div><div class="line"> }</div><div class="line"> analogWrite(led, led_level);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> fade_switch() {</div><div class="line"> led_off();</div><div class="line"> <span class="keywordflow">if</span> (isFading == <span class="keyword">true</span>) {</div><div class="line"> isFading = <span class="keyword">false</span>;</div><div class="line"> isFading_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"OFF"</span>;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> isFading = <span class="keyword">true</span>;</div><div class="line"> isFading_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"ON"</span>;</div><div class="line"> isBlinking = <span class="keyword">false</span>;</div><div class="line"> isBlinking_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"OFF"</span>;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> increase_fadePeriod() {</div><div class="line"> <span class="keywordflow">if</span> (fadePeriod < 3000) {</div><div class="line"> fadePeriod += 10;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> decrease_fadePeriod() {</div><div class="line"> <span class="keywordflow">if</span> (fadePeriod > 10) {</div><div class="line"> fadePeriod -= 10;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> blink_switch() {</div><div class="line"> led_off();</div><div class="line"> <span class="keywordflow">if</span> (isBlinking == <span class="keyword">true</span>) {</div><div class="line"> isBlinking = <span class="keyword">false</span>;</div><div class="line"> isBlinking_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"OFF"</span>;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> isBlinking = <span class="keyword">true</span>;</div><div class="line"> isBlinking_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"ON"</span>;</div><div class="line"> isFading = <span class="keyword">false</span>;</div><div class="line"> isFading_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"OFF"</span>;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> increase_blinkPeriod() {</div><div class="line"> <span class="keywordflow">if</span> (blinkPeriod < 3000) {</div><div class="line"> blinkPeriod += 50;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> decrease_blinkPeriod() {</div><div class="line"> <span class="keywordflow">if</span> (blinkPeriod > 50) {</div><div class="line"> blinkPeriod -= 50;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> led_off() {</div><div class="line"> led_level = 0;</div><div class="line"> analogWrite(led, led_level);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// Checks all the buttons.</span></div><div class="line"><span class="keywordtype">void</span> buttonsCheck() {</div><div class="line"> <span class="keywordflow">if</span> (right.check() == LOW) {</div><div class="line"> menu.next_screen();</div><div class="line"> }</div><div class="line"> <span class="keywordflow">if</span> (left.check() == LOW) {</div><div class="line"> menu.previous_screen();</div><div class="line"> }</div><div class="line"> <span class="keywordflow">if</span> (up.check() == LOW) {</div><div class="line"> <span class="comment">// Calls the function identified with</span></div><div class="line"> <span class="comment">// increase or 1 for the focused line.</span></div><div class="line"> menu.call_function(increase);</div><div class="line"> }</div><div class="line"> <span class="keywordflow">if</span> (down.check() == LOW) {</div><div class="line"> menu.call_function(decrease);</div><div class="line"> }</div><div class="line"> <span class="keywordflow">if</span> (enter.check() == LOW) {</div><div class="line"> <span class="comment">// Switches focus to the next line.</span></div><div class="line"> menu.switch_focus();</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// The fading function.</span></div><div class="line"><span class="keywordtype">void</span> fade() {</div><div class="line"> <span class="keyword">static</span> <span class="keywordtype">bool</span> goingUp = <span class="keyword">true</span>;</div><div class="line"> <span class="keywordflow">if</span> (goingUp) {</div><div class="line"> led_level += 25;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> led_level -= 25;</div><div class="line"> }</div><div class="line"> <span class="keywordflow">if</span> (led_level > 225) {</div><div class="line"> goingUp = <span class="keyword">false</span>;</div><div class="line"> led_level = 250;</div><div class="line"> }</div><div class="line"> <span class="keywordflow">if</span> (led_level < 25 && goingUp == <span class="keyword">false</span>) {</div><div class="line"> goingUp = <span class="keyword">true</span>;</div><div class="line"> led_level = 0;</div><div class="line"> }</div><div class="line"> analogWrite(led, led_level);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// The blinking function.</span></div><div class="line"><span class="keywordtype">void</span> blink() {</div><div class="line"> <span class="keyword">static</span> <span class="keywordtype">bool</span> blinkState = LOW;</div><div class="line"> <span class="keywordflow">if</span> (blinkState == LOW) {</div><div class="line"> blinkState = HIGH;</div><div class="line"> led_level = 255;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> blinkState = LOW;</div><div class="line"> led_level = 0;</div><div class="line"> }</div><div class="line"> analogWrite(led, led_level);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> setup() {</div><div class="line"> Serial.begin(250000);</div><div class="line"></div><div class="line"> pinMode(led, OUTPUT);</div><div class="line"></div><div class="line"> lcd.begin(16, 2);</div><div class="line"></div><div class="line"> <span class="comment">// The increasing functions are attached with identification of 1.</span></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> * This function can later be called by pressing the 'UP' button</span></div><div class="line"><span class="comment"> * when 'led_line' is focused. If some other line is focused it's</span></div><div class="line"><span class="comment"> * corresponding function will be called.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> led_line.attach_function(increase, increase_led_level);</div><div class="line"> <span class="comment">// The decreasing functions are attached with identification of 2.</span></div><div class="line"> led_line.attach_function(decrease, decrease_led_level);</div><div class="line"></div><div class="line"> <span class="comment">// Here the same function is attached with two different identifications.</span></div><div class="line"> <span class="comment">// It will be called on 'UP' or 'DOWN' button press.</span></div><div class="line"> fade_line.attach_function(1, fade_switch);</div><div class="line"> fade_line.attach_function(2, fade_switch);</div><div class="line"> fadePeriod_line.attach_function(increase, increase_fadePeriod);</div><div class="line"> fadePeriod_line.attach_function(decrease, decrease_fadePeriod);</div><div class="line"></div><div class="line"> blink_line.attach_function(1, blink_switch);</div><div class="line"> blink_line.attach_function(2, blink_switch);</div><div class="line"> blinkPeriod_line.attach_function(increase, increase_blinkPeriod);</div><div class="line"> blinkPeriod_line.attach_function(decrease, decrease_blinkPeriod);</div><div class="line"></div><div class="line"> menu.add_screen(welcome_screen);</div><div class="line"> menu.add_screen(led_screen);</div><div class="line"> menu.add_screen(fade_screen);</div><div class="line"> menu.add_screen(blink_screen);</div><div class="line"></div><div class="line"> isFading_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"OFF"</span>;</div><div class="line"> isBlinking_text = (<span class="keywordtype">char</span>*)<span class="stringliteral">"OFF"</span>;</div><div class="line"></div><div class="line"> menu.update();</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> loop() {</div><div class="line"> buttonsCheck();</div><div class="line"></div><div class="line"> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> lastMillis_blink = 0;</div><div class="line"> <span class="keywordflow">if</span> ((isFading == <span class="keyword">true</span>) && ((millis() - lastMillis_blink) > fadePeriod)) {</div><div class="line"> lastMillis_blink = millis();</div><div class="line"> fade();</div><div class="line"> menu.update();</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> lastMillis_fade = 0;</div><div class="line"> <span class="keywordflow">if</span> ((isBlinking == <span class="keyword">true</span>) && ((millis() - lastMillis_fade) > blinkPeriod)) {</div><div class="line"> lastMillis_fade = millis();</div><div class="line"> blink();</div><div class="line"> menu.update();</div><div class="line"> }</div><div class="line"></div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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