added sample helper code, need to convert it to integrate with pi4mic…

…ronaut

components/src/main/java/com/opensourcewithslu/components/controllers/FourDigitSevenSegmentDisplayController.java

@@ -0,0 +1,30 @@
+package com.opensourcewithslu.components.controllers;
+
+import com.opensourcewithslu.outputdevices.FourDigitSevenSegmentDisplayHelper;
+import com.opensourcewithslu.utilities.MultipinConfiguration;
+import com.pi4j.context.Context;
+import com.pi4j.io.i2c.I2CConfig;
+import io.micronaut.http.annotation.Controller;
+import io.micronaut.http.annotation.Get;
+import com.pi4j.context.Context;
+import jakarta.inject.Named;
+
+
+//tag::ex[]
+
+@Controller("/4digit7segment")
+public class FourDigitSevenSegmentDisplayController {
+
+    private final FourDigitSevenSegmentDisplayHelper fourDigitSevenSegmentDisplayHelper;
+
+    public FourDigitSevenSegmentDisplayController(@Named("4digit7segment") MultipinConfiguration fourdigsevenseg, Context pi4jContext){
+        this.fourDigitSevenSegmentDisplayHelper = new FourDigitSevenSegmentDisplayHelper(fourdigsevenseg, pi4jContext);
+    }
+
+    @Get("/test")
+    public void test(){
+        fourDigitSevenSegmentDisplayHelper.test();
+    }
+
+}
+//end::ex[]

micronautpi4j-utils/src/main/java/com/opensourcewithslu/outputdevices/FourDigitSevenSegmentDisplayHelper.java

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+package com.opensourcewithslu.outputdevices;
+
+import com.opensourcewithslu.utilities.MultipinConfiguration;
+import com.pi4j.context.Context;
+import com.pi4j.io.gpio.digital.DigitalOutput;
+
+//import com.pi4j.io.gpio.*;
+//import com.pi4j.wiringpi.Gpio; replace with pigpio
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+
+// OG code from: https://learn.sunfounder.com/lesson-1-1-5-4-digit-7-segment-display/
+// Java version from chatgpt.
+public class FourDigitSevenSegmentDisplayHelper {
+    private static final int SDI = 5; //Serial digital interface
+    private static final int RCLK = 4; //reference clock
+    private static final int SRCLK = 1; // serial clock
+
+    private static  MultipinConfiguration placePin; //pins, t
+
+    private static Context pi4jContext;
+
+    /// hex codes for the numbers       0,1,2,3,4,5,6,7,8,9
+    private static final int[] number = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90};
+
+    private static int counter = 0;
+
+
+    // I think these two need to be converted to something from the Pi4JFactory
+    //private static GpioController gpio; // replace with pi4jcontext?
+    private static DigitalOutput[] digitPins;
+
+
+    //tag::const[]
+    public FourDigitSevenSegmentDisplayHelper(MultipinConfiguration fourdigsevenseg, Context pi4jContext)
+    //end::const[]
+    {
+        placePin = fourdigsevenseg; // = {12, 3, 2, 0}, the pins are gotten from the multipin parameter.
+
+         this.pi4jContext = pi4jContext;
+
+        // Initialize Pi4J
+        //Gpio.wiringPiSetup();
+
+        // Initialize GPIO pins
+        //gpio = GpioFactory.getInstance();
+        initializePins();
+
+    }
+    //tag::method[]
+    public void test()
+    //end::method[]
+    {
+
+
+        // Set up a timer
+        Timer timer = new Timer();
+        timer.schedule(new TimerTask() {
+            @Override
+            public void run() {
+                counter++;
+                updateDisplay();
+                System.out.println(counter);
+            }
+        }, 0, 1000); // Timer updates every 1000 milliseconds (1 second)
+
+        // Keep the program running
+        while (true) {
+            // Do nothing, let the timer handle the display updates
+        }
+    }
+
+
+
+    private static void initializePins() {
+        digitPins = new DigitalOutput[4];
+
+        for (int i = 0; i < 4; i++) {
+            digitPins[i] = gpio.gpioSetMode(RaspiPin.getPinByAddress(placePin[i]), PinState.LOW);
+        }
+
+        Gpio.pinMode(SDI, Gpio.OUTPUT);
+        Gpio.pinMode(RCLK, Gpio.OUTPUT);
+        Gpio.pinMode(SRCLK, Gpio.OUTPUT);
+    }
+
+    private static void updateDisplay() {
+        for (int i = 0; i < 4; i++) {
+            clearDisplay();
+            pickDigit(i);
+            hc595Shift(number[counter % (int) Math.pow(10, i + 1) / (int) Math.pow(10, i)]);
+        }
+    }
+
+    private static void pickDigit(int digit) {
+        for (int i = 0; i < 4; i++) {
+            digitPins[i].setState(i == digit);
+        }
+    }
+
+    private static void hc595Shift(int data) {
+        for (int i = 7; i >= 0; i--) {
+            Gpio.digitalWrite(SDI, (data & (1 << i)) != 0 ? Gpio.HIGH : Gpio.LOW);
+            Gpio.digitalWrite(SRCLK, Gpio.HIGH);
+            sleep(1);
+            Gpio.digitalWrite(SRCLK, Gpio.LOW);
+        }
+
+        Gpio.digitalWrite(RCLK, Gpio.HIGH);
+        sleep(1);
+        Gpio.digitalWrite(RCLK, Gpio.LOW);
+    }
+
+    private static void clearDisplay() {
+        for (int i = 0; i < 8; i++) {
+            Gpio.digitalWrite(SDI, Gpio.HIGH);
+            Gpio.digitalWrite(SRCLK, Gpio.HIGH);
+            sleep(1);
+            Gpio.digitalWrite(SRCLK, Gpio.LOW);
+        }
+
+        Gpio.digitalWrite(RCLK, Gpio.HIGH);
+        sleep(1);
+        Gpio.digitalWrite(RCLK, Gpio.LOW);
+    }
+
+    private static void sleep(int millis) {
+        try {
+            Thread.sleep(millis);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+}