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usb-serial-for-android
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FTDI driver: Experimental async support. 

Disabled due to Android bug.
This commit is contained in:
mike wakerly 2012-08-09 15:32:25 -07:00
parent fbf2607124
commit b96d43639e
1 changed files with 47 additions and 12 deletions
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59
UsbSerialLibrary/src/com/hoho/android/usbserial/driver/FtdiSerialDriver.java
View File

@ -20,15 +20,19 @@
package com.hoho.android.usbserial.driver;
import java.io.IOException;
import java.util.Arrays;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbRequest;
import android.util.Log;
import com.hoho.android.usbserial.util.HexDump;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Arrays;
/**
* A {@link UsbSerialDriver} implementation for a variety of FTDI devices
* <p>
@ -165,6 +169,13 @@ public class FtdiSerialDriver implements UsbSerialDriver {
private int mMaxPacketSize = 64; // TODO(mikey): detect
/**
* Due to http://b.android.com/28023 , we cannot use UsbRequest async reads
* since it gives no indication of number of bytes read. Set this to
* {@code true} on platforms where it is fixed.
*/
private static final boolean ENABLE_ASYNC_READS = false;
/**
* Constructor.
*
@ -224,17 +235,41 @@ public class FtdiSerialDriver implements UsbSerialDriver {
final int readAmt = Math.min(dest.length, mReadBuffer.length);
final UsbEndpoint endpoint = mDevice.getInterface(0).getEndpoint(0);
final int transferred = mConnection.bulkTransfer(endpoint, mReadBuffer, readAmt,
timeoutMillis);
if (transferred < MODEM_STATUS_HEADER_LENGTH) {
throw new IOException("Expected at least " + MODEM_STATUS_HEADER_LENGTH + " bytes");
if (ENABLE_ASYNC_READS) {
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 nread = buf.position() - MODEM_STATUS_HEADER_LENGTH;
if (nread > 0) {
Log.d(TAG, HexDump.dumpHexString(dest, 0, Math.min(32, dest.length)));
return nread;
} else {
return 0;
}
} else {
final int transferred = mConnection.bulkTransfer(endpoint, mReadBuffer, readAmt,
timeoutMillis);
if (transferred < MODEM_STATUS_HEADER_LENGTH) {
throw new IOException("Expected at least " + MODEM_STATUS_HEADER_LENGTH + " bytes");
}
final int nread = transferred - MODEM_STATUS_HEADER_LENGTH;
if (nread > 0) {
System.arraycopy(mReadBuffer, MODEM_STATUS_HEADER_LENGTH, dest, 0, nread);
}
return nread;
}
final int nread = transferred - MODEM_STATUS_HEADER_LENGTH;
if (nread > 0) {
System.arraycopy(mReadBuffer, MODEM_STATUS_HEADER_LENGTH, dest, 0, nread);
}
return nread;
}
@Override