import java.util.*;
import jdk.dio.*;
import jdk.dio.uart.*;
import java.io.*;
import java.nio.*;
import java.nio.charset.*;

public class TestUart {

    private static UART uart = null;

    private static TimerTask readTask = new TimerTask() {
        public void run() {
            ByteBuffer buffer = ByteBuffer.allocate(32);
            try {
                System.out.println("Reading from UART");
                uart.read(buffer);
            } catch (Exception e) {
                System.out.println("RT: Caught exception: " + e);
            }
            System.out.println("Read: " + new String(buffer.array()));
        }
    };

    private static TimerTask writeTask = new TimerTask() {
            private int pass = 0;
            public void run() {
                String msg = "Hello " + pass++;
                ByteBuffer buffer = ByteBuffer.wrap(msg.getBytes());
                try {
                    uart.write(buffer);
                } catch (Exception e) {
                    System.out.println("WT: Caught exception: " + e);
                }
                System.out.println("Wrote: " + new String(buffer.array()));//buffer.asCharBuffer());
            }
    };

    public static void main(String[] args) {
        try {
            uart = (UART)DeviceManager.open(40); // 40 = UART device in dio.properties
        } catch (Exception e) {
            System.out.println("Caught exception: " + e);
        }

        System.out.println("Available charsets are: " + Charset.availableCharsets());

        Timer wt = new Timer();
        wt.schedule(writeTask, 0, 1000);
        Timer rt = new Timer();
        rt.scheduleAtFixedRate(readTask, 500, 1000);
        try {
            Thread.sleep(30000);
        } catch (Exception e) {
            System.out.println("Ignoring: " + e);
        }
        rt.cancel();
        try {
            Thread.sleep(5000);
        } catch (Exception e) {
            System.out.println("Ignoring: " + e);
        }
        wt.cancel();
        try {
            uart.close();
        } catch (Exception e) {
            System.out.println("Caught exception: " + e);
        }

    }
}