[xrp] Add getter for XRP LED (#7327)

xrpVendordep/src/main/java/edu/wpi/first/wpilibj/xrp/XRPOnBoardIO.java

@@ -38,4 +38,13 @@ public class XRPOnBoardIO {
   public void setLed(boolean value) {
     m_led.set(value);
   }
+
+  /**
+   * Gets state of the onboard LED.
+   *
+   * @return True if LED is active, false otherwise.
+   */
+  public boolean getLed() {
+    return m_led.get();
+  }
 }

xrpVendordep/src/main/native/cpp/xrp/XRPOnBoardIO.cpp

@@ -18,3 +18,7 @@ bool XRPOnBoardIO::GetUserButtonPressed() {
 void XRPOnBoardIO::SetLed(bool value) {
   m_led.Set(value);
 }
+
+bool XRPOnBoardIO::GetLed() const {
+  return m_led.Get();
+}

xrpVendordep/src/main/native/include/frc/xrp/XRPOnBoardIO.h

@@ -35,6 +35,8 @@ class XRPOnBoardIO {
 
   /**
    * Gets if the USER button is pressed.
+   *
+   * @return True if the USER button is currently pressed.
    */
   bool GetUserButtonPressed();
 
@@ -43,6 +45,13 @@ class XRPOnBoardIO {
    */
   void SetLed(bool value);
 
+  /**
+   * Gets the state of the yellow LED.
+   *
+   * @return True if LED is active, false otherwise.
+   */
+  bool GetLed() const;
+
  private:
   frc::DigitalInput m_userButton{0};
   frc::DigitalOutput m_led{1};