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Code Issues Releases Wiki Activity

implement async read for all devices

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This commit is contained in:
Kai Morich 2018-03-23 22:58:33 +01:00
parent adb22f718e
commit 0ea5b282b7
10 changed files with 251 additions and 104 deletions
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4
.idea/.gitignore generated vendored Normal file
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@ -0,0 +1,4 @@
caches
codeStyles
libraries
workspace.xml

2
build.gradle
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@ -6,7 +6,7 @@ buildscript {
google()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.1'
classpath 'com.android.tools.build:gradle:3.1.1'
}
}

4
gradle/wrapper/gradle-wrapper.properties vendored
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@ -1,6 +1,6 @@
#Thu Oct 26 20:06:55 CEST 2017
#Tue Mar 27 21:28:01 CEST 2018
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

2
usbSerialExamples/build.gradle
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@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.2"
buildToolsVersion '27.0.3'
defaultConfig {
minSdkVersion 14

4
usbSerialForAndroid/build.gradle
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@ -4,7 +4,7 @@ apply plugin: 'signing'
android {
compileSdkVersion 26
buildToolsVersion "26.0.2"
buildToolsVersion '27.0.3'
defaultConfig {
minSdkVersion 14
@ -22,7 +22,7 @@ android {
dependencies {
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support:support-annotations:27.1.0'
androidTestImplementation 'com.android.support:support-annotations:27.1.1'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'commons-net:commons-net:3.6'
androidTestImplementation 'org.apache.commons:commons-lang3:3.7'

188
usbSerialForAndroid/src/androidTest/java/com/hoho/android/usbserial/DeviceTest.java
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@ -36,6 +36,7 @@ import android.hardware.usb.UsbManager;
import android.support.test.InstrumentationRegistry;
import android.support.test.runner.AndroidJUnit4;
import android.util.Log;
import android.os.Process;
import com.hoho.android.usbserial.driver.CdcAcmSerialDriver;
import com.hoho.android.usbserial.driver.Ch34xSerialDriver;
@ -48,7 +49,6 @@ import com.hoho.android.usbserial.driver.UsbSerialPort;
import com.hoho.android.usbserial.driver.UsbSerialProber;
import com.hoho.android.usbserial.util.SerialInputOutputManager;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.net.telnet.InvalidTelnetOptionException;
import org.apache.commons.net.telnet.TelnetClient;
import org.apache.commons.net.telnet.TelnetCommand;
@ -79,13 +79,15 @@ import static org.junit.Assert.fail;
@RunWith(AndroidJUnit4.class)
public class DeviceTest implements SerialInputOutputManager.Listener {
private final static String rfc2217_server_host = "192.168.0.171";
private final static String rfc2217_server_host = "192.168.0.100";
private final static int rfc2217_server_port = 2217;
private final static boolean rfc2217_server_nonstandard_baudrates = false; // false on Windows
private final static boolean rfc2217_server_nonstandard_baudrates = false; // false on Windows, Raspi
private final static boolean rfc2217_server_parity_mark_space = false; // false on Raspi
private final static int TELNET_READ_WAIT = 500;
private final static int USB_READ_WAIT = 500;
private final static int USB_WRITE_WAIT = 500;
private final static Integer SERIAL_INPUT_OUTPUT_MANAGER_THREAD_PRIORITY = Process.THREAD_PRIORITY_URGENT_AUDIO;
private final static String TAG = "DeviceTest";
private final static byte RFC2217_COM_PORT_OPTION = 0x2c;
@ -101,6 +103,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
private SerialInputOutputManager usbIoManager;
private final Deque<byte[]> usbReadBuffer = new LinkedList<>();
private boolean usbReadBlock = false;
private long usbReadTime = 0;
private static TelnetClient telnetClient;
private static InputStream telnetReadStream;
@ -137,7 +140,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
@Before
public void setUp() throws Exception {
setUpFixtureInt();
telnetClient.sendAYT(1000); // not corrctly handled by rfc2217_server.py, but WARNING output "ignoring Telnet command: '\xf6'" is a nice separator between tests
telnetClient.sendAYT(1000); // not correctly handled by rfc2217_server.py, but WARNING output "ignoring Telnet command: '\xf6'" is a nice separator between tests
telnetComPortOptionCounter[0] = 0;
telnetWriteDelay = 0;
@ -175,7 +178,15 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
usbSerialPort.open(usbDeviceConnection);
usbSerialPort.setDTR(true);
usbSerialPort.setRTS(true);
usbIoManager = new SerialInputOutputManager(usbSerialPort, this);
usbIoManager = new SerialInputOutputManager(usbSerialPort, this) {
@Override
public void run() {
if(SERIAL_INPUT_OUTPUT_MANAGER_THREAD_PRIORITY != null)
Process.setThreadPriority(SERIAL_INPUT_OUTPUT_MANAGER_THREAD_PRIORITY);
super.run();
}
};
Executors.newSingleThreadExecutor().submit(usbIoManager);
synchronized (usbReadBuffer) {
@ -263,7 +274,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
private byte[] usbRead(int expectedLength) throws Exception {
long end = System.currentTimeMillis() + USB_READ_WAIT;
ByteBuffer buf = ByteBuffer.allocate(4096);
ByteBuffer buf = ByteBuffer.allocate(8192);
if(usbIoManager != null) {
while (System.currentTimeMillis() < end) {
synchronized (usbReadBuffer) {
@ -335,6 +346,16 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
@Override
public void onNewData(byte[] data) {
long now = System.currentTimeMillis();
if(usbReadTime == 0)
usbReadTime = now;
if(data.length > 64) {
Log.d(TAG, "usb read: time+=" + String.format("%-3d",now-usbReadTime) + " len=" + String.format("%-4d",data.length) + " data=" + new String(data, 0, 32) + "..." + new String(data, data.length-32, 32));
} else {
Log.d(TAG, "usb read: time+=" + String.format("%-3d",now-usbReadTime) + " len=" + String.format("%-4d",data.length) + " data=" + new String(data));
}
usbReadTime = now;
while(usbReadBlock)
try {
Thread.sleep(1);
@ -351,6 +372,32 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
assertTrue("usb connection lost", false);
}
// clone of org.apache.commons.lang3.StringUtils.indexOfDifference + optional startpos
private static int indexOfDifference(final CharSequence cs1, final CharSequence cs2) {
return indexOfDifference(cs1, cs2, 0, 0);
}
private static int indexOfDifference(final CharSequence cs1, final CharSequence cs2, int cs1startpos, int cs2startpos) {
if (cs1 == cs2) {
return -1;
}
if (cs1 == null || cs2 == null) {
return 0;
}
if(cs1startpos < 0 || cs2startpos < 0)
return -1;
int i, j;
for (i = cs1startpos, j = cs2startpos; i < cs1.length() && j < cs2.length(); ++i, ++j) {
if (cs1.charAt(i) != cs2.charAt(j)) {
break;
}
}
if (j < cs2.length() || i < cs1.length()) {
return i;
}
return -1;
}
@Test
public void baudRate() throws Exception {
@ -565,7 +612,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
if (usbSerialDriver instanceof CdcAcmSerialDriver) {
// not supported by arduino_leonardo_bridge.ino, other devices might support it
} else {
} else if (rfc2217_server_parity_mark_space) {
usbParameters(19200, 7, 1, UsbSerialPort.PARITY_MARK);
usbWrite(_8n1);
data = telnetRead(4);
@ -597,6 +644,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
if (usbSerialDriver instanceof CdcAcmSerialDriver) {
// not supported by arduino_leonardo_bridge.ino, other devices might support it
} else {
if (rfc2217_server_parity_mark_space) {
telnetParameters(19200, 7, 1, UsbSerialPort.PARITY_MARK);
telnetWrite(_8n1);
data = usbRead(4);
@ -606,7 +654,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
telnetWrite(_8n1);
data = usbRead(4);
assertThat("19200/7S1", data, equalTo(_7s1));
}
usbParameters(19200, 7, 1, UsbSerialPort.PARITY_ODD);
telnetParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
telnetWrite(_8n1);
@ -635,23 +683,23 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
// o - stop bit (1)
// d - data bit
// out 8N2: addddddd doadddddddoo
// 1000001 0 1
// in 6N1: addddddo adddddo
// 100000 101
// out 8N2: addddddd doaddddddddo
// 1000001 0 10001111
// in 6N1: addddddo addddddo
// 100000 101000
usbParameters(19200, 8, UsbSerialPort.STOPBITS_1, UsbSerialPort.PARITY_NONE);
telnetParameters(19200, 6, 1, UsbSerialPort.PARITY_NONE);
usbWrite(new byte[]{65, 1});
usbWrite(new byte[]{(byte)0x41, (byte)0xf1});
data = telnetRead(2);
assertThat("19200/8N1", data, equalTo(new byte[]{1, 5}));
// out 8N2: addddddd dooadddddddoo
// 1000001 0 1
// out 8N2: addddddd dooaddddddddoo
// 1000001 0 10011111
// in 6N1: addddddo addddddo
// 100000 1101
// 100000 110100
usbParameters(19200, 8, UsbSerialPort.STOPBITS_2, UsbSerialPort.PARITY_NONE);
telnetParameters(19200, 6, 1, UsbSerialPort.PARITY_NONE);
usbWrite(new byte[]{65, 1});
usbWrite(new byte[]{(byte)0x41, (byte)0xf9});
data = telnetRead(2);
assertThat("19200/8N1", data, equalTo(new byte[]{1, 11}));
// todo: could create similar test for 1.5 stopbits, by reading at double speed
@ -705,7 +753,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
Log.i(TAG, "bufferSize " + bufferSize);
usbReadBlock = true;
for (linenr = 0; linenr < bufferSize/8; linenr++) {
line = String.format("%06d\r\n", linenr);
line = String.format("%07d,", linenr);
telnetWrite(line.getBytes());
expected.append(line);
}
@ -714,7 +762,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
// slowly write new data, until old data is comletely read from buffer and new data is received again
boolean found = false;
for (; linenr < bufferSize/8 + maxWait/10 && !found; linenr++) {
line = String.format("%06d\r\n", linenr);
line = String.format("%07d,", linenr);
telnetWrite(line.getBytes());
Thread.sleep(10);
expected.append(line);
@ -731,7 +779,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
if (data.length() != expected.length())
break;
}
int pos = StringUtils.indexOfDifference(data, expected);
int pos = indexOfDifference(data, expected);
Log.i(TAG, "bufferSize " + bufferSize + ", first difference at " + pos);
// actual values have large variance for same device, e.g.
// bufferSize 4096, first difference at 164
@ -740,21 +788,30 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
assertTrue(data.length() != expected.length());
}
//
// this test can fail sporadically!
//
// Android is not a real time OS, so there is no guarantee that the usb thread is scheduled, or it might be blocked by Java garbage collection.
// The SerialInputOutputManager uses a buffer size of 4Kb. Reading of these blocks happen behind UsbRequest.queue / UsbDeviceConnection.requestWait
// The dump of data and error positions in logcat show, that data is lost somewhere in the UsbRequest handling,
// very likely when the individual 64 byte USB packets are not read fast enough, and the serial converter chip has to discard bytes.
//
// On some days SERIAL_INPUT_OUTPUT_MANAGER_THREAD_PRIORITY=THREAD_PRIORITY_URGENT_AUDIO reduced errors by factor 10, on other days it had no effect at all!
//
@Test
// see logcat for performance results
public void readSpeed() throws Exception {
// see logcat for performance results
//
// CDC arduino_leonardo_bridge.ini has transfer speed ~ 100 byte/sec
// all other devices are near physical limit with ~ 10-12k/sec
int baudrate = 115200;
usbParameters(baudrate, 8, 1, UsbSerialPort.PARITY_NONE);
telnetParameters(baudrate, 8, 1, UsbSerialPort.PARITY_NONE);
// CH340 w/o asyncReads (bulkTransfer) is much slower and fails reproducibly here
// FTDI w/o asyncReads (bulkTransfer) does not continue to read after ~2k
// CP2102 and PL2303 do not have data loss issues with bulkTransfer
usbParameters(115200, 8, 1, UsbSerialPort.PARITY_NONE);
telnetParameters(115200, 8, 1, UsbSerialPort.PARITY_NONE);
// limited write ahead to avoid buffer overrun
// with unlimited write ahead all devices fail sporadically. is it windows/device/usb-buffer overrun?
int writeAhead = 2000;
// fails more likely with larger or unlimited (-1) write ahead
int writeSeconds = 5;
int writeAhead = 5*baudrate/10; // write ahead for another 5 second read
if(usbSerialDriver instanceof CdcAcmSerialDriver)
writeAhead = 50;
@ -763,14 +820,14 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
StringBuilder data = new StringBuilder();
StringBuilder expected = new StringBuilder();
int dlen = 0, elen = 0;
Log.i(TAG, "readSpeed: 'in' should be near "+115200/10);
Log.i(TAG, "readSpeed: 'read' should be near "+baudrate/10);
long begin = System.currentTimeMillis();
long next = System.currentTimeMillis();
for(int seconds=1; seconds<=5; seconds++) {
for(int seconds=1; seconds <= writeSeconds; seconds++) {
next += 1000;
while (System.currentTimeMillis() < next) {
if(expected.length() < data.length() + writeAhead) {
line = String.format("%06d\r\n", linenr++);
if((writeAhead < 0) || (expected.length() < data.length() + writeAhead)) {
line = String.format("%07d,", linenr++);
telnetWrite(line.getBytes());
expected.append(line);
} else {
@ -778,31 +835,55 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
}
data.append(new String(usbRead(0)));
}
Log.i(TAG, "readSpeed: t="+(next-begin)+", in="+(data.length()-dlen)+", out="+(expected.length()-elen));
Log.i(TAG, "readSpeed: t="+(next-begin)+", read="+(data.length()-dlen)+", write="+(expected.length()-elen));
dlen = data.length();
elen = expected.length();
}
boolean found = false;
for (linenr=0; linenr < 2000 && !found; linenr++) {
long maxwait = Math.max(1000, (expected.length() - data.length()) * 20000L / baudrate );
next = System.currentTimeMillis() + maxwait;
Log.d(TAG, "readSpeed: rest wait time " + maxwait + " for " + (expected.length() - data.length()) + " byte");
while(!found && System.currentTimeMillis() < next) {
data.append(new String(usbRead(0)));
Thread.sleep(1);
found = data.toString().endsWith(line);
Thread.sleep(1);
}
next = System.currentTimeMillis();
//Log.i(TAG, "readSpeed: t="+(next-begin)+", in="+(data.length()-dlen));
assertTrue(found);
int pos = StringUtils.indexOfDifference(data, expected);
if(pos!=-1) {
Log.i(TAG, "readSpeed: first difference at " + pos);
String datasub = data.substring(Math.max(pos - 20, 0), Math.min(pos + 20, data.length()));
String expectedsub = expected.substring(Math.max(pos - 20, 0), Math.min(pos + 20, expected.length()));
assertThat(datasub, equalTo(expectedsub));
//next = System.currentTimeMillis();
//Log.i(TAG, "readSpeed: t="+(next-begin)+", read="+(data.length()-dlen));
int errcnt = 0;
int errlen = 0;
int datapos = indexOfDifference(data, expected);
int expectedpos = datapos;
while(datapos != -1) {
errcnt += 1;
int nextexpectedpos = -1;
int nextdatapos = datapos + 2;
int len = -1;
if(nextdatapos + 10 < data.length()) { // try to sync data+expected, assuming that data is lost, but not corrupted
String nextsub = data.substring(nextdatapos, nextdatapos + 10);
nextexpectedpos = expected.indexOf(nextsub, expectedpos);
if(nextexpectedpos >= 0) {
len = nextexpectedpos - expectedpos - 2;
errlen += len;
}
}
Log.i(TAG, "readSpeed: difference at " + datapos + " len " + len );
Log.d(TAG, "readSpeed: got " + data.substring(Math.max(datapos - 20, 0), Math.min(datapos + 20, data.length())));
Log.d(TAG, "readSpeed: expected " + expected.substring(Math.max(expectedpos - 20, 0), Math.min(expectedpos + 20, expected.length())));
datapos = indexOfDifference(data, expected, nextdatapos, nextexpectedpos);
expectedpos = nextexpectedpos + (datapos - nextdatapos);
}
if(errcnt != 0)
Log.i(TAG, "readSpeed: got " + errcnt + " errors, total len " + errlen+ ", avg. len " + errlen/errcnt);
assertTrue("end not found", found);
assertEquals("no errors", 0, errcnt);
}
@Test
// see logcat for performance results
public void writeSpeed() throws Exception {
// see logcat for performance results
//
// CDC arduino_leonardo_bridge.ini has transfer speed ~ 100 byte/sec
// all other devices can get near physical limit:
// longlines=true:, speed is near physical limit at 11.5k
@ -816,21 +897,21 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
StringBuilder data = new StringBuilder();
StringBuilder expected = new StringBuilder();
int dlen = 0, elen = 0;
Log.i(TAG, "writeSpeed: 'out' should be near "+115200/10);
Log.i(TAG, "writeSpeed: 'write' should be near "+115200/10);
long begin = System.currentTimeMillis();
long next = System.currentTimeMillis();
for(int seconds=1; seconds<=5; seconds++) {
next += 1000;
while (System.currentTimeMillis() < next) {
if(longlines)
line = String.format("%060d\r\n", linenr++);
line = String.format("%060d,", linenr++);
else
line = String.format("%06d\r\n", linenr++);
line = String.format("%07d,", linenr++);
usbWrite(line.getBytes());
expected.append(line);
data.append(new String(telnetRead(0)));
}
Log.i(TAG, "writeSpeed: t="+(next-begin)+", out="+(expected.length()-elen)+", in="+(data.length()-dlen));
Log.i(TAG, "writeSpeed: t="+(next-begin)+", write="+(expected.length()-elen)+", read="+(data.length()-dlen));
dlen = data.length();
elen = expected.length();
}
@ -841,10 +922,11 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
found = data.toString().endsWith(line);
}
next = System.currentTimeMillis();
Log.i(TAG, "writeSpeed: t="+(next-begin)+", in="+(data.length()-dlen));
Log.i(TAG, "writeSpeed: t="+(next-begin)+", read="+(data.length()-dlen));
assertTrue(found);
int pos = StringUtils.indexOfDifference(data, expected);
int pos = indexOfDifference(data, expected);
if(pos!=-1) {
Log.i(TAG, "writeSpeed: first difference at " + pos);
String datasub = data.substring(Math.max(pos - 20, 0), Math.min(pos + 20, data.length()));
String expectedsub = expected.substring(Math.max(pos - 20, 0), Math.min(pos + 20, expected.length()));

4
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java
View File

@ -191,8 +191,7 @@ public class Ch34xSerialDriver implements UsbSerialDriver {
} finally {
request.close();
}
}
} else {
final int numBytesRead;
synchronized (mReadBufferLock) {
int readAmt = Math.min(dest.length, mReadBuffer.length);
@ -209,6 +208,7 @@ public class Ch34xSerialDriver implements UsbSerialDriver {
}
return numBytesRead;
}
}
@Override
public int write(byte[] src, int timeoutMillis) throws IOException {

31
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Cp21xxSerialDriver.java
View File

@ -26,9 +26,12 @@ import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbRequest;
import android.os.Build;
import android.util.Log;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
@ -101,11 +104,13 @@ public class Cp21xxSerialDriver implements UsbSerialDriver {
private static final int CONTROL_WRITE_DTR = 0x0100;
private static final int CONTROL_WRITE_RTS = 0x0200;
private final boolean mEnableAsyncReads;
private UsbEndpoint mReadEndpoint;
private UsbEndpoint mWriteEndpoint;
public Cp21xxSerialPort(UsbDevice device, int portNumber) {
super(device, portNumber);
mEnableAsyncReads = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1);
}
@Override
@ -179,6 +184,31 @@ public class Cp21xxSerialDriver implements UsbSerialDriver {
@Override
public int read(byte[] dest, int timeoutMillis) throws IOException {
if (mEnableAsyncReads) {
final UsbRequest request = new UsbRequest();
try {
request.initialize(mConnection, mReadEndpoint);
final ByteBuffer buf = ByteBuffer.wrap(dest);
if (!request.queue(buf, dest.length)) {
throw new IOException("Error queueing request.");
}
final UsbRequest response = mConnection.requestWait();
if (response == null) {
throw new IOException("Null response");
}
final int nread = buf.position();
if (nread > 0) {
//Log.d(TAG, HexDump.dumpHexString(dest, 0, Math.min(32, dest.length)));
return nread;
} else {
return 0;
}
} finally {
request.close();
}
} else {
final int numBytesRead;
synchronized (mReadBufferLock) {
int readAmt = Math.min(dest.length, mReadBuffer.length);
@ -195,6 +225,7 @@ public class Cp21xxSerialDriver implements UsbSerialDriver {
}
return numBytesRead;
}
}
@Override
public int write(byte[] src, int timeoutMillis) throws IOException {

31
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/ProlificSerialDriver.java
View File

@ -32,10 +32,13 @@ import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbRequest;
import android.os.Build;
import android.util.Log;
import java.io.IOException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
@ -109,6 +112,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
private int mDeviceType = DEVICE_TYPE_HX;
private final boolean mEnableAsyncReads;
private UsbEndpoint mReadEndpoint;
private UsbEndpoint mWriteEndpoint;
private UsbEndpoint mInterruptEndpoint;
@ -126,6 +130,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
public ProlificSerialPort(UsbDevice device, int portNumber) {
super(device, portNumber);
mEnableAsyncReads = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1);
}
@Override
@ -368,6 +373,31 @@ public class ProlificSerialDriver implements UsbSerialDriver {
@Override
public int read(byte[] dest, int timeoutMillis) throws IOException {
if (mEnableAsyncReads) {
final UsbRequest request = new UsbRequest();
try {
request.initialize(mConnection, mReadEndpoint);
final ByteBuffer buf = ByteBuffer.wrap(dest);
if (!request.queue(buf, dest.length)) {
throw new IOException("Error queueing request.");
}
final UsbRequest response = mConnection.requestWait();
if (response == null) {
throw new IOException("Null response");
}
final int nread = buf.position();
if (nread > 0) {
//Log.d(TAG, HexDump.dumpHexString(dest, 0, Math.min(32, dest.length)));
return nread;
} else {
return 0;
}
} finally {
request.close();
}
} else {
synchronized (mReadBufferLock) {
int readAmt = Math.min(dest.length, mReadBuffer.length);
int numBytesRead = mConnection.bulkTransfer(mReadEndpoint, mReadBuffer,
@ -379,6 +409,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
return numBytesRead;
}
}
}
@Override
public int write(byte[] src, int timeoutMillis) throws IOException {

1
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/util/SerialInputOutputManager.java
View File

@ -120,7 +120,6 @@ public class SerialInputOutputManager implements Runnable {
* called, or until a driver exception is raised.
*
* NOTE(mikey): Uses inefficient read/write-with-timeout.
* TODO(mikey): Read asynchronously with {@link UsbRequest#queue(ByteBuffer, int)}
*/
@Override
public void run() {