Hi everyone,
We are trying to develop an application to get Tag location data through serial port.
The problem we are facing is, we are able to give commands like ‘lep’, to get data but we are not receiving any data from it. The code is pasted below.
package com.hariharan.arduinousb;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.felhr.usbserial.UsbSerialDevice;
import com.felhr.usbserial.UsbSerialInterface;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import java.util.Timer;
public class MainActivity extends Activity {
public final String ACTION_USB_PERMISSION = “com.hariharan.arduinousb.USB_PERMISSION”;
Button startButton, sendButton, clearButton, stopButton;
TextView textView;
EditText editText;
UsbManager usbManager;
UsbDevice device;
UsbSerialDevice serialPort;
UsbDeviceConnection connection;
UsbSerialInterface.UsbReadCallback mCallback = new UsbSerialInterface.UsbReadCallback() { //Defining a Callback which triggers whenever data is read.
@Override
public void onReceivedData(byte[] arg0) {
String data = null;
try {
data = new String(arg0, “UTF-8”);
data.concat("/n");
tvAppend(textView, data);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
};
private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { //Broadcast Receiver to automatically start and stop the Serial connection.
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(ACTION_USB_PERMISSION)) {
boolean granted = intent.getExtras().getBoolean(UsbManager.EXTRA_PERMISSION_GRANTED);
if (granted) {
connection = usbManager.openDevice(device);
serialPort = UsbSerialDevice.createUsbSerialDevice(device, connection);
if (serialPort != null) {
if (serialPort.open()) { //Set Serial Connection Parameters.
setUiEnabled(true);
serialPort.setBaudRate(115200);
serialPort.setDataBits(UsbSerialInterface.DATA_BITS_8);
serialPort.setStopBits(UsbSerialInterface.STOP_BITS_1);
serialPort.setParity(UsbSerialInterface.PARITY_NONE);
serialPort.setFlowControl(UsbSerialInterface.FLOW_CONTROL_OFF);
serialPort.read(mCallback);
tvAppend(textView,“Serial Connection Opened!\n”);
/try {
enterSerialMode();
} catch (InterruptedException e) {
e.printStackTrace( );
}/
} else {
Log.d(“SERIAL”, “PORT NOT OPEN”);
}
} else {
Log.d(“SERIAL”, “PORT IS NULL”);
}
} else {
Log.d(“SERIAL”, “PERM NOT GRANTED”);
}
} else if (intent.getAction().equals(UsbManager.ACTION_USB_DEVICE_ATTACHED)) {
onClickStart(startButton);
} else if (intent.getAction().equals(UsbManager.ACTION_USB_DEVICE_DETACHED)) {
onClickStop(stopButton);
}
}
;
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
usbManager = (UsbManager) getSystemService(this.USB_SERVICE);
startButton = (Button) findViewById(R.id.buttonStart);
sendButton = (Button) findViewById(R.id.buttonSend);
clearButton = (Button) findViewById(R.id.buttonClear);
stopButton = (Button) findViewById(R.id.buttonStop);
editText = (EditText) findViewById(R.id.editText);
textView = (TextView) findViewById(R.id.textView);
setUiEnabled(false);
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
registerReceiver(broadcastReceiver, filter);
}
public void setUiEnabled(boolean bool) {
startButton.setEnabled(!bool);
sendButton.setEnabled(bool);
stopButton.setEnabled(bool);
textView.setEnabled(bool);
}
public void onClickStart(View view) {
HashMap<String, UsbDevice> usbDevices = usbManager.getDeviceList();
if (!usbDevices.isEmpty()) {
boolean keep = true;
for (Map.Entry<String, UsbDevice> entry : usbDevices.entrySet()) {
device = entry.getValue();
int deviceVID = device.getVendorId();
if (deviceVID != 0)//Device ID
{
PendingIntent pi = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
usbManager.requestPermission(device, pi);
keep = false;
} else {
connection = null;
device = null;
}
if (!keep)
break;
}
}
}
/* private void enterSerialMode() throws InterruptedException {
String string1 = “0x0A 0x0A”; // \n ANCII value = 0x0A
serialPort.write(string1.getBytes());
Thread.sleep(10);
//String string2 = “0x0A 0x0A lep”;
serialPort.write(string2.getBytes());//
String string3 = “lep”;
serialPort.write(string3.getBytes());
}*/
public void onClickSend(View view) {
String string = editText.getText().toString();
serialPort.write(string.getBytes());
tvAppend(textView, "\nData Sent : " + string + “\n”);
}
public void onClickStop(View view) {
setUiEnabled(false);
serialPort.close();
tvAppend(textView,"\nSerial Connection Closed! \n");
}
public void onClickClear(View view) {
textView.setText(" ");
}
private void tvAppend(TextView tv, CharSequence text) {
final TextView ftv = tv;
final CharSequence ftext = text;
runOnUiThread(new Runnable() {
@Override
public void run() {
ftv.append(ftext);
}
});
}
}
Any particular reason for this?
Thanks,
Varun