Comunicando con dispositivo USB hecho a medida en Android

StackOverflow https://stackoverflow.com//questions/23042753

  •  21-12-2019
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Pregunta

Estoy construyendo una solicitud para comunicarse con un tablero hecho a medida (PIC16F1454) a través de USB.Probé la comunicación de la Junta utilizando aplicaciones de terminales en el teléfono y la computadora portátil y funciona perfectamente.

He construido una solicitud para enviar y recibir datos de la placa, pero nada parece funcionar.A continuación se muestra mi clase responsable de la comunicación: 

package com.fyp.eece502androidusb;

import java.util.HashMap;
import java.util.Iterator;

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.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.util.Log;

public class UsbController {

    private final Context mApplicationContext;
    private final UsbManager mUsbManager;
    private final IUsbConnectionHandler mConnectionHandler;
    private final int VID;
    private final int PID;
    protected static final String ACTION_USB_PERMISSION = "com.fyp.eece502androidusb.USB";

    /**
     * Activity is needed for onResult
     * 
     * @param parentActivity
     */
    public UsbController(Activity parentActivity,
            IUsbConnectionHandler connectionHandler, int vid, int pid) {
        mApplicationContext = parentActivity.getApplicationContext();
        mConnectionHandler = connectionHandler;
        mUsbManager = (UsbManager) mApplicationContext
                .getSystemService(Context.USB_SERVICE);
        VID = vid;
        PID = pid;
        init();
    }

    private void init() {
        enumerate(new IPermissionListener() {
            @Override
            public void onPermissionDenied(UsbDevice d) {
                UsbManager usbman = (UsbManager) mApplicationContext
                        .getSystemService(Context.USB_SERVICE);
                PendingIntent pi = PendingIntent.getBroadcast(
                        mApplicationContext, 0, new Intent(
                                ACTION_USB_PERMISSION), 0);
                mApplicationContext.registerReceiver(mPermissionReceiver,
                        new IntentFilter(ACTION_USB_PERMISSION));
                usbman.requestPermission(d, pi);
            }
        });
    }

    public void stop() {
        mStop = true;
        synchronized (sSendLock) {
            sSendLock.notify();
        }
        try {
            if (mUsbThread != null)
                mUsbThread.join();
        } catch (InterruptedException e) {
            e(e);
        }
        mStop = false;
        mLoop = null;
        mUsbThread = null;

        try {
            mApplicationContext.unregisterReceiver(mPermissionReceiver);
        } catch (IllegalArgumentException e) {
        }
        ;// bravo
    }

    private UsbRunnable mLoop;
    private Thread mUsbThread;

    private void startHandler(UsbDevice d) {
        if (mLoop != null) {
            mConnectionHandler.onErrorLooperRunningAlready();
            return;
        }
        mLoop = new UsbRunnable(d);
        mUsbThread = new Thread(mLoop);
        mUsbThread.start();
    }

    public void send(byte data) {
        mData = data;
        synchronized (sSendLock) {
            sSendLock.notify();
        }
    }

    private void enumerate(IPermissionListener listener) {
        l("enumerating");
        HashMap<String, UsbDevice> devlist = mUsbManager.getDeviceList();
        Iterator<UsbDevice> deviter = devlist.values().iterator();
        while (deviter.hasNext()) {
            UsbDevice d = deviter.next();
            l("Found device: "
                    + String.format("%04X:%04X", d.getVendorId(),
                            d.getProductId()));
            if (d.getVendorId() == VID && d.getProductId() == PID) {
                l("Device under: " + d.getDeviceName());
                if (!mUsbManager.hasPermission(d))
                    listener.onPermissionDenied(d);
                else {
                    startHandler(d);
                    return;
                }
                break;
            }
        }
        l("no more devices found");
        mConnectionHandler.onDeviceNotFound();
    }

    private class PermissionReceiver extends BroadcastReceiver {
        private final IPermissionListener mPermissionListener;

        public PermissionReceiver(IPermissionListener permissionListener) {
            mPermissionListener = permissionListener;
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            mApplicationContext.unregisterReceiver(this);
            if (intent.getAction().equals(ACTION_USB_PERMISSION)) {
                if (!intent.getBooleanExtra(
                        UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                    mPermissionListener.onPermissionDenied((UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE));
                } else {
                    l("Permission granted");
                    UsbDevice dev = (UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE);
                    if (dev != null) {
                        if (dev.getVendorId() == VID
                                && dev.getProductId() == PID) {
                            startHandler(dev);// has new thread
                        }
                    } else {
                        e("device not present!");
                    }
                }
            }
        }

    }

    // MAIN LOOP
    private static final Object[] sSendLock = new Object[] {};
    private boolean mStop = false;
    private byte mData = 0x00;

    private class UsbRunnable implements Runnable {
        private final UsbDevice mDevice;

        UsbRunnable(UsbDevice dev) {
            mDevice = dev;
        }

        @Override
        public void run() {// here the main USB functionality is implemented
            UsbDeviceConnection conn = mUsbManager.openDevice(mDevice);
            if (!conn.claimInterface(mDevice.getInterface(1), true)) {
                return;
            }

            // controlTransfer
            int baudRate = 115200;
            int stopBits = 1;
            int parity = 0;
            int dataBits = 8;
            byte[] msg = { (byte) (baudRate & 0xff),
                    (byte) ((baudRate >> 8) & 0xff),
                    (byte) ((baudRate >> 16) & 0xff),
                    (byte) ((baudRate >> 24) & 0xff),

                    (byte) stopBits, (byte) parity, (byte) dataBits };
            int USB_RT_ACM = UsbConstants.USB_TYPE_CLASS | 1;

            UsbControllerActivity.conn1Reply = conn.controlTransfer(USB_RT_ACM,
                    34, 0x03, 0, null, 0, 0);
            UsbControllerActivity.conn2Reply = conn.controlTransfer(USB_RT_ACM,
                    32, 0, 0, msg, msg != null ? msg.length : 0, 0);
            //

            UsbEndpoint epIN = null;
            UsbEndpoint epOUT = null;

            UsbInterface usbIf = mDevice.getInterface(1);
            for (int i = 0; i < usbIf.getEndpointCount(); i++) {
                if (usbIf.getEndpoint(i).getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {
                    if (usbIf.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN) {
                        epIN = usbIf.getEndpoint(i);
                        UsbControllerActivity.epINExists = true;
                    } else {
                        epOUT = usbIf.getEndpoint(i);
                        UsbControllerActivity.epOUTExists = true;
                    }
                }
            }

            for (;;) {// this is the main loop for transferring
                synchronized (sSendLock) {
                    try {
                        sSendLock.wait();
                    } catch (InterruptedException e) {
                        if (mStop) {
                            mConnectionHandler.onUSBStopped();
                            return;
                        }
                        e.printStackTrace();
                    }
                }
                UsbControllerActivity.mDataSent = new byte[] { (byte) (0x04) };
                UsbControllerActivity.bulkXFEROutReply = conn.bulkTransfer(
                        epOUT, UsbControllerActivity.mDataSent, 1, 0);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                UsbControllerActivity.bulkXFERInReply = conn.bulkTransfer(epIN,
                        UsbControllerActivity.mDataReceived, 10, 0);

                if (mStop) {
                    mConnectionHandler.onUSBStopped();
                    return;
                }
            }
        }
    }

    // END MAIN LOOP
    private BroadcastReceiver mPermissionReceiver = new PermissionReceiver(
            new IPermissionListener() {
                @Override
                public void onPermissionDenied(UsbDevice d) {
                    l("Permission denied on " + d.getDeviceId());
                }
            });

    private static interface IPermissionListener {
        void onPermissionDenied(UsbDevice d);
    }

    public final static String TAG = "USBController";

    private void l(Object msg) {
        Log.d(TAG, ">==< " + msg.toString() + " >==<");
    }

    private void e(Object msg) {
        Log.e(TAG, ">==< " + msg.toString() + " >==<");
    }
}

Estoy recibiendo valores devueltos de 0 y 7 para las transferencias de control, y 1 para la transferencia a granel cuando se envía y no se recibe nada.

Aunque la transferencia a granel indica que se envía el valor, nada cambia en el lado receptor (un LED parpadeante en la pizarra).

Mi especulación es que debe haber algo malo con la transferencia de control: 

int baudRate = 115200;
int stopBits = 1;
int parity = 0;
int dataBits = 8;
byte[] msg = { (byte) (baudRate & 0xff),
        (byte) ((baudRate >> 8) & 0xff),
        (byte) ((baudRate >> 16) & 0xff),
        (byte) ((baudRate >> 24) & 0xff),

        (byte) stopBits, (byte) parity, (byte) dataBits };
int USB_RT_ACM = UsbConstants.USB_TYPE_CLASS | 1;

UsbControllerActivity.conn1Reply = conn.controlTransfer(USB_RT_ACM,
        34, 0x03, 0, null, 0, 0);
UsbControllerActivity.conn2Reply = conn.controlTransfer(USB_RT_ACM,
        32, 0, 0, msg, msg != null ? msg.length : 0, 0);

El dispositivo USB está configurado como un dispositivo CDC.

¿Alguna ayuda?

¿Fue útil?

Solución

Gracias al comentario de Chris Stratton, pude encontrar el problema en mi código.

  1. Estaba enviando 0x04 (CTRL-D) en lugar de 0x34 (4)
  2. El control de control parece ser innecesario, estoy usando PIC16F1454 con funcionalidad USB incorporada
  3. El búfer de recepción era más pequeño que la respuesta de la PIC que también causó problemas

    4. El código modificado está a continuación: 

    package com.fyp.eece502androidusb;

import java.util.HashMap;
import java.util.Iterator;

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.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.util.Log;

public class UsbController {

    private final Context mApplicationContext;
    private final UsbManager mUsbManager;
    private final IUsbConnectionHandler mConnectionHandler;
    private final int VID;
    private final int PID;
    protected static final String ACTION_USB_PERMISSION = "com.fyp.eece502androidusb.USB";

    /**
     * Activity is needed for onResult
     * 
     * @param parentActivity
     */
    public UsbController(Activity parentActivity,
            IUsbConnectionHandler connectionHandler, int vid, int pid) {
        mApplicationContext = parentActivity.getApplicationContext();
        mConnectionHandler = connectionHandler;
        mUsbManager = (UsbManager) mApplicationContext
                .getSystemService(Context.USB_SERVICE);
        VID = vid;
        PID = pid;
        init();
    }

    private void init() {
        enumerate(new IPermissionListener() {
            @Override
            public void onPermissionDenied(UsbDevice d) {
                UsbManager usbman = (UsbManager) mApplicationContext
                        .getSystemService(Context.USB_SERVICE);
                PendingIntent pi = PendingIntent.getBroadcast(
                        mApplicationContext, 0, new Intent(
                                ACTION_USB_PERMISSION), 0);
                mApplicationContext.registerReceiver(mPermissionReceiver,
                        new IntentFilter(ACTION_USB_PERMISSION));
                usbman.requestPermission(d, pi);
            }
        });
    }

    public void stop() {
        mStop = true;
        synchronized (sSendLock) {
            sSendLock.notify();
        }
        try {
            if (mUsbThread != null)
                mUsbThread.join();
        } catch (InterruptedException e) {
            e(e);
        }
        mStop = false;
        mLoop = null;
        mUsbThread = null;

        try {
            mApplicationContext.unregisterReceiver(mPermissionReceiver);
        } catch (IllegalArgumentException e) {
        }
    }

    private UsbRunnable mLoop;
    private Thread mUsbThread;

    private void startHandler(UsbDevice d) {
        if (mLoop != null) {
            mConnectionHandler.onErrorLooperRunningAlready();
            return;
        }
        mLoop = new UsbRunnable(d);
        mUsbThread = new Thread(mLoop);
        mUsbThread.start();
    }

    public void send(byte data) {
        mData = data;
        synchronized (sSendLock) {
            sSendLock.notify();
        }
    }

    private void enumerate(IPermissionListener listener) {
        l("enumerating");
        HashMap<String, UsbDevice> devlist = mUsbManager.getDeviceList();
        Iterator<UsbDevice> deviter = devlist.values().iterator();
        while (deviter.hasNext()) {
            UsbDevice d = deviter.next();
            l("Found device: "
                    + String.format("%04X:%04X", d.getVendorId(),
                            d.getProductId()));
            if (d.getVendorId() == VID && d.getProductId() == PID) {
                l("Device under: " + d.getDeviceName());
                if (!mUsbManager.hasPermission(d))
                    listener.onPermissionDenied(d);
                else {
                    startHandler(d);
                    return;
                }
                break;
            }
        }
        l("no more devices found");
        mConnectionHandler.onDeviceNotFound();
    }

    private class PermissionReceiver extends BroadcastReceiver {
        private final IPermissionListener mPermissionListener;

        public PermissionReceiver(IPermissionListener permissionListener) {
            mPermissionListener = permissionListener;
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            mApplicationContext.unregisterReceiver(this);
            if (intent.getAction().equals(ACTION_USB_PERMISSION)) {
                if (!intent.getBooleanExtra(
                        UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                    mPermissionListener.onPermissionDenied((UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE));
                } else {
                    l("Permission granted");
                    UsbDevice dev = (UsbDevice) intent
                            .getParcelableExtra(UsbManager.EXTRA_DEVICE);
                    if (dev != null) {
                        if (dev.getVendorId() == VID
                                && dev.getProductId() == PID) {
                            startHandler(dev);// has new thread
                        }
                    } else {
                        e("device not present!");
                    }
                }
            }
        }

    }

    // MAIN LOOP
    private static final Object[] sSendLock = new Object[] {};
    private boolean mStop = false;
    private byte mData = 0x00;

    private class UsbRunnable implements Runnable {
        private final UsbDevice mDevice;

        UsbRunnable(UsbDevice dev) {
            mDevice = dev;
        }

        @Override
        public void run() {// here the main USB functionality is implemented
            UsbDeviceConnection conn = mUsbManager.openDevice(mDevice);
            if (!conn.claimInterface(mDevice.getInterface(1), true)) {
                return;
            }

            UsbEndpoint epIN = null;
            UsbEndpoint epOUT = null;

            UsbInterface usbIf = mDevice.getInterface(1);
            for (int i = 0; i < usbIf.getEndpointCount(); i++) {
                if (usbIf.getEndpoint(i).getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {
                    if (usbIf.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN) {
                        epIN = usbIf.getEndpoint(i);
                        UsbControllerActivity.epINExists = true;
                    } else {
                        epOUT = usbIf.getEndpoint(i);
                        UsbControllerActivity.epOUTExists = true;
                    }
                }
            }

            for (;;) {// this is the main loop for transferring
                synchronized (sSendLock) {
                    try {
                        sSendLock.wait();
                    } catch (InterruptedException e) {
                        if (mStop) {
                            mConnectionHandler.onUSBStopped();
                            return;
                        }
                        e.printStackTrace();
                    }
                }
                UsbControllerActivity.mDataSent = new byte[] { (byte) (0x34) };
                UsbControllerActivity.bulkXFEROutReply = conn.bulkTransfer(
                        epOUT, UsbControllerActivity.mDataSent, 1, 0);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                UsbControllerActivity.bulkXFERInReply = conn.bulkTransfer(epIN,
                        UsbControllerActivity.mDataReceived, 20, 0);

                if (mStop) {
                    mConnectionHandler.onUSBStopped();
                    return;
                }
            }
        }
    }

    // END MAIN LOOP
    private BroadcastReceiver mPermissionReceiver = new PermissionReceiver(
            new IPermissionListener() {
                @Override
                public void onPermissionDenied(UsbDevice d) {
                    l("Permission denied on " + d.getDeviceId());
                }
            });

    private static interface IPermissionListener {
        void onPermissionDenied(UsbDevice d);
    }

    public final static String TAG = "USBController";

    private void l(Object msg) {
        Log.d(TAG, ">==< " + msg.toString() + " >==<");
    }

    private void e(Object msg) {
        Log.e(TAG, ">==< " + msg.toString() + " >==<");
    }
}

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