dfu_java/src/main/java/com/rusefi/dfu/android/AndroidDfuConnection.java

package com.rusefi.dfu.android;

import android.hardware.usb.UsbDeviceConnection;
import com.rusefi.dfu.DfuCommmand;
import com.rusefi.dfu.DfuConnection;
import com.rusefi.dfu.FlashRange;

import java.nio.ByteBuffer;

import static android.hardware.usb.UsbConstants.USB_DIR_IN;
import static android.hardware.usb.UsbConstants.USB_DIR_OUT;

public class AndroidDfuConnection implements DfuConnection {
    private final UsbDeviceConnection usbDeviceConnection;
    private final FlashRange flashRange;

    private static final byte REQUEST_TYPE_CLASS = 32;
    private static final byte RECIPIENT_INTERFACE = 0x01;

    public AndroidDfuConnection(UsbDeviceConnection usbDeviceConnection, FlashRange flashRange) {
        this.usbDeviceConnection = usbDeviceConnection;
        this.flashRange = flashRange;
    }

    @Override
    public FlashRange getFlashRange() {
        return flashRange;
    }

    @Override
    public int getTransferSize() {
        return 0;
    }

    @Override
    public int receiveData(DfuCommmand command, short wValue, ByteBuffer data) {
        return transfer(usbDeviceConnection, USB_DIR_IN, command.getValue(), wValue, data);
    }

    @Override
    public int sendData(DfuCommmand command, short wValue, ByteBuffer data) {
        return transfer(usbDeviceConnection, USB_DIR_OUT, command.getValue(), wValue, data);
    }

    private static int transfer(UsbDeviceConnection connection, int direction, int request, short wValue, ByteBuffer byteBuffer) {
        return connection.controlTransfer(REQUEST_TYPE_CLASS | RECIPIENT_INTERFACE | direction, request,
                wValue, 0, byteBuffer.array(), byteBuffer.limit(), 500);
    }
}