first commit

src/main/java/SBC/GPIO.java

@@ -0,0 +1,165 @@
+package SBC;
+
+import com.sun.jna.Platform;
+import org.tinylog.Logger;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+@SuppressWarnings("unused")
+public class GPIO {
+
+    private static final Path gpioPath = Path.of("/sys/class/gpio");
+    private static final Path gpioExportPath = Path.of("/sys/class/gpio/export");
+    private static final Path gpioUnexportPath = Path.of("/sys/class/gpio/unexport");
+
+
+    public static boolean IsRaspberry64(){
+        if (Platform.isLinux()){
+            if (Platform.isARM()){
+                if (Platform.is64Bit()){
+                    if (gpioPath.toFile().isDirectory()){
+                        if (gpioExportPath.toFile().isFile()){
+                            if (gpioUnexportPath.toFile().isFile()){
+                                return true;
+                            } else Logger.error("GPIO unexport path is not found");
+                        } else Logger.error("GPIO export path is not found");
+                    } else Logger.error("GPIO path is not found");
+                } else Logger.info("Device is not 64 bit");
+            } else Logger.info("Device is not ARM");
+        } else Logger.info("OS is not Linux");
+        return false;
+    }
+
+    /**
+     * Check if the pin is already exported
+     * @param pin GPIO pin number
+     * @return true if the pin is already exported
+     */
+    public static boolean GpioPinExists(int pin){
+        Path pinPath = gpioPath.resolve("gpio"+pin);
+        return pinPath.toFile().isDirectory();
+    }
+
+    /**
+     * Export the pin
+     * @param pin GPIO pin number
+     * @return true if the pin is successfully exported
+     */
+    public static boolean ExportPin(int pin){
+        try{
+            if (Files.isWritable(gpioExportPath)){
+                Files.write(gpioExportPath, String.valueOf(pin).getBytes());
+                Logger.info("Pin "+pin+" exported");
+                return GpioPinExists(pin);
+            } else Logger.error("GPIO export path is not writable");
+        } catch (Exception e){
+            Logger.error("Failed to export pin: "+pin+", Message: "+e.getMessage());
+        }
+        return false;
+    }
+
+    /**
+     * Unexport the pin
+     * @param pin GPIO pin number
+     * @return true if the pin is successfully unexported
+     */
+    public static boolean UnexportPin(int pin){
+        if (Files.isWritable(gpioUnexportPath)){
+            try{
+                Files.write(gpioUnexportPath, String.valueOf(pin).getBytes());
+                Logger.info("Pin "+pin+" unexported");
+                return true;
+            } catch (Exception e){
+                Logger.error("Failed to unexport pin: "+pin+", Message: "+e.getMessage());
+            }
+        } else Logger.error("GPIO unexport path is not writable");
+
+        return false;
+    }
+
+    /**
+     * Get Direction of the pin
+     * @param pin GPIO pin number
+     * @return "in" if the pin is input, "out" if the pin is output, "unknown" if the direction is unknown
+     */
+    public static String GetPinDirection(int pin){
+        Path pinPath = gpioPath.resolve("gpio"+pin).resolve("direction");
+        if (pinPath.toFile().isFile()){
+            if (Files.isReadable(pinPath)){
+                try{
+                    return Files.readString(pinPath).trim();
+                } catch (Exception e){
+                    Logger.error("Failed to read pin direction: "+pin+", Message: "+e.getMessage());
+                }
+            } else Logger.error("Pin direction file is not readable: "+pin);
+        } else Logger.error("Pin direction file not found: "+pin);
+        return "unknown";
+    }
+
+    /**
+     * Set the direction of the pin
+     * @param pin GPIO pin number
+     * @param direction "in" for input, "out" for output
+     * @return true if the direction is successfully set
+     */
+    public static boolean SetPinDirection(int pin, String direction){
+        Path pinPath = gpioPath.resolve("gpio"+pin).resolve("direction");
+        if (pinPath.toFile().isFile()){
+            if (Files.isWritable(pinPath)){
+                direction = direction.trim().toLowerCase();
+                if ("in".equals(direction) || "out".equals(direction)){
+                    try{
+                        Files.write(pinPath, direction.getBytes());
+                        Logger.info("Pin "+pin+" direction set to "+direction);
+                        return true;
+                    } catch (Exception e){
+                        Logger.error("Failed to set pin direction: "+pin+", Message: "+e.getMessage());
+                    }
+                } else Logger.error("Invalid direction: "+direction);
+            } else Logger.error("Pin direction file is not writable: "+pin);
+        } else Logger.error("Pin direction file not found: "+pin);
+        return false;
+    }
+
+    /**
+     * Set the value of the output pin
+     * @param pin GPIO pin number
+     * @param isON true to set the pin value to 1, false to set the pin value to 0
+     * @return true if the value is successfully set
+     */
+    public static boolean SetValue(int pin, boolean isON){
+        Path pinPath = gpioPath.resolve("gpio"+pin).resolve("value");
+        if (pinPath.toFile().isFile()){
+            if (Files.isWritable(pinPath)){
+                try{
+                    Files.write(pinPath, isON?"1".getBytes():"0".getBytes());
+                    Logger.info("Pin "+pin+" value set to "+(isON?"1":"0"));
+                    return true;
+                } catch (Exception e){
+                    Logger.error("Failed to set pin value: "+pin+", Message: "+e.getMessage());
+                }
+            } else Logger.error("Pin value file is not writable: "+pin);
+        } else Logger.error("Pin value file not found: "+pin);
+        return false;
+    }
+
+    /**
+     * Get the value of the pin
+     * @param pin GPIO pin number
+     * @return "1" if the pin value is 1, "0" if the pin value is 0, "unknown" if the value is unknown
+     */
+    public static String GetValue(int pin){
+        Path pinPath = gpioPath.resolve("gpio"+pin).resolve("value");
+        if (pinPath.toFile().isFile()){
+            if (Files.isReadable(pinPath)){
+                try{
+                    return Files.readString(pinPath).trim();
+                } catch (Exception e){
+                    Logger.error("Failed to read pin value: "+pin+", Message: "+e.getMessage());
+                }
+            } else Logger.error("Pin value file is not readable: "+pin);
+        } else Logger.error("Pin value file not found: "+pin);
+        return "unknown";
+    }
+}