Currently i'm using PN7150 with android board. The NFC reader (PN7150) can be used to read type A cards, but cannot detect type B cards at all.
Below is the PCB antenna that I used :
The following is a schematic for the antenna matching circuit:
Smith chart simulation results from RFSim99:
Below is the signal shape (Smith chart) of the measurement results on the PCB board using Nano VNA.
This is my android code :
MainActivity.java
package com.iwjo.nfcfieldstrength;
public class MainActivity extends AppCompatActivity implements NfcAdapter.ReaderCallback, NfcThread.UiCallback{
public static final boolean mbUsbExternalUSBManager = false;
private static final String ACTION_USB_PERMISSION = "com.iwjo.ktpfieldstrength.USB_PERMISSION";
private UsbManager mUsbManager = null;
private PendingIntent mPermissionIntent= null;
public static final int REQUEST_WRITE_PERMISSION = 786;
private static final int REQUEST_WRITE_STORAGE_REQUEST_CODE = 112;
private NfcAdapter nfcadapter;
private String[][] nfctechfilter = new String[][] { new String[] { NfcA.class.getName() } };
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver(){
public void onReceive(Context context, Intent intent){
String action = intent.getAction();
if(ACTION_USB_PERMISSION.equals(action)){
synchronized(this){
if (action.equals(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED)) {
int state = intent.getIntExtra(NfcAdapter.EXTRA_ADAPTER_STATE,
NfcAdapter.STATE_ON);
if (state == NfcAdapter.STATE_ON
|| state == NfcAdapter.STATE_TURNING_ON) {
///Log.d(TAGCL, "state: " + state);
if (state == NfcAdapter.STATE_ON) {
nfcadapter.enableReaderMode(
MainActivity.this,
MainActivity.this,
NfcAdapter.FLAG_READER_NFC_A
| NfcAdapter.FLAG_READER_NFC_B
//| NfcAdapter.FLAG_READER_NFC_F
//| NfcAdapter.FLAG_READER_NFC_V
//| NfcAdapter.FLAG_READER_NFC_BARCODE
//| NfcAdapter.FLAG_READER_NO_PLATFORM_SOUNDS
| NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK,
null);
}
} else {
showMessage(getString(R.string.nfc_not_activated));
}
}
}
}
}
};
private void requestPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_WRITE_PERMISSION);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == REQUEST_WRITE_PERMISSION && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
/////--Log.d(TAGSAM, "permission granted");
}
}
@Override
protected void onPostResume() {
//bindComponents();
super.onPostResume();
if (!nfcadapter.isEnabled()) {
showMessage(getString(R.string.nfc_not_activated));
return;
}
IntentFilter filter = new IntentFilter(
NfcAdapter.ACTION_ADAPTER_STATE_CHANGED);
//registerReceiver(mBroadcastReceiver, filter);
nfcadapter.enableReaderMode(this, this, NfcAdapter.FLAG_READER_NFC_A
| NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK | NfcAdapter.FLAG_READER_NFC_B | NfcAdapter.FLAG_READER_NFC_F, null);
}
@Override
protected void onPause() {
super.onPause();
//unregisterReceiver(mBroadcastReceiver);
nfcadapter.disableReaderMode(this);
}
@Override
protected void onDestroy() {
if( mbUsbExternalUSBManager ){
unregisterReceiver(mUsbReceiver);
}
if( mbUsbExternalUSBManager ){
unregisterReceiver(mUsbReceiver);
}
super.onDestroy();
}
@Override
public void showMessage(final String msg) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_LONG).show();
}
});
}
@Override
public void setEditText(final int id, final String txt, final int status) {
runOnUiThread(new Runnable() {
@Override
public void run() {
//EditText edit = (EditText) findViewById(id);
//eMessage.setText(txt);
setMessageText(txt, status);
}
});
}
public void setMessageText(String text, int status)
{
// status 0 : normal proses, 1 : berhasil, 2 : error
}
@Override
public void setBiodata(final Biodata bio) {
runOnUiThread(new Runnable() {
@Override
public void run() {
}
});
}
@Override
public void setProgressBar(final int id, final int value) {
runOnUiThread(new Runnable() {
@Override
public void run() {
ProgressBar pbar = (ProgressBar) findViewById(id);
pbar.setProgress(value);
}
});
}
private void setErrorMessage(String text)
{
//eMessage.setBackground(Color.red());
}
@Override
public void onTagDiscovered(Tag tag) {
if(isSam_authenticate) {
Runnable nfcr = new NfcThread(this, tag, this);
new Thread(nfcr).start();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
//actionBar.setIcon(R.mipmap.ic_launcher);
actionBar.setDisplayShowHomeEnabled(true);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
progressBar = (ProgressBar) findViewById(R.id.progressBar);
eMessage = (TextView) findViewById(R.id.eMessage);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
try {
nfcadapter = NfcAdapter.getDefaultAdapter(this);
if (nfcadapter == null) {
Toast.makeText(this, getString(R.string.nfc_unavailable), Toast.LENGTH_LONG).show();
finish();
}
} catch (Exception f) {
}
mainContext = this;
requestAppPermissions();
}
private void requestAppPermissions() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
return;
}
if (hasReadPermissions() && hasWritePermissions()) {
return;
}
ActivityCompat.requestPermissions(this,
new String[] {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
}, REQUEST_WRITE_STORAGE_REQUEST_CODE); // your request code
}
private boolean hasReadPermissions() {
return (ContextCompat.checkSelfPermission(getBaseContext(), Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
}
private boolean hasWritePermissions() {
return (ContextCompat.checkSelfPermission(getBaseContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
}
}
NfcThread.java
package com.iwjo.nfcfieldstrength;
import android.content.Context;
import android.nfc.Tag;
import android.nfc.tech.IsoDep;
import android.util.Log;
import com.iwjo.ktpfieldstrength.R;
import java.io.IOException;
public class NfcThread implements Runnable {
public static final String TAG_CL_IN = ">>";
public static final String TAG_CL_OUT = "<<";
public interface UiCallback {
void showMessage(String msg);
void setEditText(int id, String txt, int status);
void setBiodata(Biodata bio);
void setProgressBar(int id, int value);
}
private Context context;
private Tag tag;
private UiCallback cb;
public NfcThread(Context context, Tag tag, UiCallback cb) {
this.context = context;
this.tag = tag;
this.cb = cb;
}
private IsoDep iso;
@Override
public void run() {
iso = IsoDep.get(tag);
if (iso == null) {
cb.showMessage(context.getString(R.string.non_iso));
return;
}
try {
iso.connect();
} catch (IOException e) {
cb.showMessage(context.getString(R.string.iso_connect_error));
Log.e(TAG, context.getString(R.string.iso_connect_error) + " : " + e.getMessage());
return;
}
try {
byte[] uid = iso.getTag().getId();
String ret = StringUtils.convertByteArrayToHexString(uid);
cb.showMessage("Card detected, UID : "+ret);
cb.setEditText(R.id.eMessage, "", 0);
} catch (Exception e) {
} finally {
try {
iso.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
private String send_apdu(String sapdu) throws IOException {
//Log.i(TAG, "SEND -> " + sapdu);
final byte [] apdu = StringUtils.convertHexStringToByteArray(StringUtils.removeSpaces(sapdu));
byte [] recv = iso.transceive(apdu);
String ret = StringUtils.convertByteArrayToHexString(recv);
Log.i(TAG_CL_OUT, ret);
return ret;
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.iwjo.nfcfieldstrength">
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.NFC" />
<uses-feature android:name="android.hardware.nfc" android:required="true" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<permission android:name="android.permission.REBOOT" />
<permission android:name="android.permission.MODIFY_PHONE_STATE" />
<permission android:name="android.permission.DEVICE_POWER" />
<uses-feature android:name="android.hardware.usb.host" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Please give me advice..