private void setDevice(UsbDevice device) {
mConnection = mUsbManager.openDevice(device);
intf = device.getInterface(0);
UsbEndpoint epOut = null;
UsbEndpoint epIn = null;
UsbEndpoint epEv = null;
// Looking for Bulk Endpoints
for (int i = 0; i < intf.getEndpointCount(); i++) {
UsbEndpoint ep = intf.getEndpoint(i);
if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {
if (ep.getDirection() == UsbConstants.USB_DIR_OUT) {
epOut = ep;
} else {
epIn = ep;
}
}
if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_INT) {
epEv = ep;
}
}
if (epOut == null || epIn == null || epEv == null) {
throw new IllegalArgumentException("not all endpoints found");
}
mEndpointBulkOut = epOut;
mEndpointBulkIn = epIn;
mEndpointIntr = epEv;
inMaxPS = mEndpointBulkIn.getMaxPacketSize();
}
@Override
public int read(byte[] dest, int timeoutMillis) throws IOException {
final UsbEndpoint endpoint = mDevice.getInterface(0).getEndpoint(0);
if (ENABLE_ASYNC_READS) {
final int readAmt;
synchronized (mReadBufferLock) {
// mReadBuffer is only used for maximum read size.
readAmt = Math.min(dest.length, mReadBuffer.length);
}
final UsbRequest request = new UsbRequest();
request.initialize(mConnection, endpoint);
final ByteBuffer buf = ByteBuffer.wrap(dest);
if (!request.queue(buf, readAmt)) {
throw new IOException("Error queueing request.");
}
final UsbRequest response = mConnection.requestWait();
if (response == null) {
throw new IOException("Null response");
}
final int payloadBytesRead = buf.position() - MODEM_STATUS_HEADER_LENGTH;
if (payloadBytesRead > 0) {
Log.d(TAG, HexDump.dumpHexString(dest, 0, Math.min(32, dest.length)));
return payloadBytesRead;
} else {
return 0;
}
} else {
final int totalBytesRead;
synchronized (mReadBufferLock) {
final int readAmt = Math.min(dest.length, mReadBuffer.length);
totalBytesRead = mConnection.bulkTransfer(endpoint, mReadBuffer, readAmt, timeoutMillis);
if (totalBytesRead < MODEM_STATUS_HEADER_LENGTH) {
throw new IOException("Expected at least " + MODEM_STATUS_HEADER_LENGTH + " bytes");
}
return filterStatusBytes(mReadBuffer, dest, totalBytesRead, endpoint.getMaxPacketSize());
}
}
}