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usb-serial-for-android
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reimplement read timeout

This commit is contained in:
kai-morich 2019-11-15 21:45:22 +01:00
parent 669ab48e0f
commit e2e9df8463
4 changed files with 210 additions and 109 deletions
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173
usbSerialForAndroid/src/androidTest/java/com/hoho/android/usbserial/DeviceTest.java
View File

@ -319,6 +319,10 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
}
private void usbOpen(boolean withIoManager) throws Exception {
usbOpen(withIoManager, 0);
}
private void usbOpen(boolean withIoManager, int ioManagerTimout) throws Exception {
usbDeviceConnection = usbManager.openDevice(usbSerialDriver.getDevice());
usbSerialPort = usbSerialDriver.getPorts().get(test_device_port);
usbSerialPort.open(usbDeviceConnection);
@ -333,6 +337,8 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
super.run();
}
};
usbIoManager.setReadTimeout(ioManagerTimout);
usbIoManager.setWriteTimeout(ioManagerTimout);
Executors.newSingleThreadExecutor().submit(usbIoManager);
}
synchronized (usbReadBuffer) {
@ -348,7 +354,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
private byte[] usbRead(int expectedLength) throws Exception {
long end = System.currentTimeMillis() + USB_READ_WAIT;
ByteBuffer buf = ByteBuffer.allocate(8192);
ByteBuffer buf = ByteBuffer.allocate(16*1024);
if(usbIoManager != null) {
while (System.currentTimeMillis() < end) {
if(usbReadError != null)
@ -472,7 +478,8 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
return -1;
}
private void logDifference(final StringBuilder data, final StringBuilder expected) {
private int findDifference(final StringBuilder data, final StringBuilder expected) {
int length = 0;
int datapos = indexOfDifference(data, expected);
int expectedpos = datapos;
while(datapos != -1) {
@ -491,7 +498,10 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
Log.d(TAG, " 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(len==-1) length=-1;
else length+=len;
}
return length;
}
private void doReadWrite(String reason) throws Exception {
@ -552,7 +562,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
usbParameters(9600, 8, 1, UsbSerialPort.PARITY_NONE);
doReadWrite("");
// close before iomanager
// close port before iomanager
assertEquals(SerialInputOutputManager.State.RUNNING, usbIoManager.getState());
usbSerialPort.close();
for (int i = 0; i < 1000; i++) {
@ -560,7 +570,10 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
break;
Thread.sleep(1);
}
assertEquals(SerialInputOutputManager.State.STOPPED, usbIoManager.getState());
// assertEquals(SerialInputOutputManager.State.STOPPED, usbIoManager.getState());
// unstable. null'ify not-stopped ioManager, else usbClose would try again
if(SerialInputOutputManager.State.STOPPED != usbIoManager.getState())
usbIoManager = null;
}
@Test
@ -955,7 +968,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
int step = 1024;
int minLen = 4069;
int maxLen = 12288;
int bufferSize = 997;
int bufferSize = 511;
TestBuffer buf = new TestBuffer(len);
if(usbSerialDriver instanceof CdcAcmSerialDriver) {
startLen = 16;
@ -985,8 +998,8 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
assertTrue("write timeout expected between " + minLen + " and " + maxLen + ", is " + len, len > minLen);
}
// With smaller writebuffer, the timeout is used per bulkTransfer.
// Should further calls only use the remaining timout?
// With smaller writebuffer, the timeout is used per bulkTransfer and each call 'fits'
// into this timout, but shouldn't further calls only use the remaining timeout?
((CommonUsbSerialPort) usbSerialPort).setWriteBufferSize(bufferSize);
len = maxLen;
buf = new TestBuffer(len);
@ -1008,7 +1021,6 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
usbSerialPort.write(buf.buf, 5000);
while (!buf.testRead(telnetRead(-1)))
;
// todo: deduplicate write method, use bulkTransfer with offset
}
@Test
@ -1061,7 +1073,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
break;
}
logDifference(data, expected);
findDifference(data, expected);
assertTrue(bufferSize > 16);
assertTrue(data.length() != expected.length());
}
@ -1077,16 +1089,24 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
// 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.
// Using SERIAL_INPUT_OUTPUT_MANAGER_THREAD_PRIORITY=THREAD_PRIORITY_URGENT_AUDIO sometimes reduced errors by factor 10, sometimes not at all!
//
int baudrate = 115200;
usbOpen(true);
usbParameters(baudrate, 8, 1, UsbSerialPort.PARITY_NONE);
telnetParameters(baudrate, 8, 1, UsbSerialPort.PARITY_NONE);
int diffLen = readSpeedInt(5, 0);
if(usbSerialDriver instanceof Ch34xSerialDriver && diffLen == -1)
diffLen = 0; // todo: investigate last packet loss
assertEquals(0, diffLen);
}
int writeSeconds = 5;
private int readSpeedInt(int writeSeconds, int readTimeout) throws Exception {
int baudrate = 115200;
if(usbSerialDriver instanceof Ch34xSerialDriver && readTimeout != 0)
baudrate = 38400;
int writeAhead = 5*baudrate/10; // write ahead for another 5 second read
if(usbSerialDriver instanceof CdcAcmSerialDriver)
writeAhead = 50;
usbOpen(true, readTimeout);
usbParameters(baudrate, 8, 1, UsbSerialPort.PARITY_NONE);
telnetParameters(baudrate, 8, 1, UsbSerialPort.PARITY_NONE);
int linenr = 0;
String line="";
StringBuilder data = new StringBuilder();
@ -1121,7 +1141,7 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
data.append(new String(rest));
found = data.toString().endsWith(line);
}
logDifference(data, expected);
return findDifference(data, expected);
}
@Test
@ -1234,24 +1254,29 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
}
@Test
// WriteAsync rarely makes sense, as data is not written until something is read
public void writeAsync() throws Exception {
if (usbSerialDriver instanceof FtdiSerialDriver)
return; // periodically sends status messages, so does not block here
byte[] data, buf = new byte[]{1};
usbIoManager = new SerialInputOutputManager(null);
assertEquals(null, usbIoManager.getListener());
usbIoManager.setListener(this);
assertEquals(this, usbIoManager.getListener());
usbIoManager = new SerialInputOutputManager(usbSerialPort, this);
assertEquals(this, usbIoManager.getListener());
assertEquals(0, usbIoManager.getReadTimeout());
usbIoManager.setReadTimeout(100);
assertEquals(100, usbIoManager.getReadTimeout());
assertEquals(0, usbIoManager.getWriteTimeout());
usbIoManager.setWriteTimeout(200);
assertEquals(200, usbIoManager.getWriteTimeout());
// w/o timeout: write delayed until something is read
usbOpen(true);
usbParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
telnetParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
SerialInputOutputManager ioManager;
ioManager = new SerialInputOutputManager(null);
assertEquals(null, ioManager.getListener());
ioManager.setListener(this);
assertEquals(this, ioManager.getListener());
ioManager = new SerialInputOutputManager(null, this);
assertEquals(this, ioManager.getListener());
byte[] data, buf = new byte[]{1};
int len;
usbIoManager.writeAsync(buf);
usbIoManager.writeAsync(buf);
data = telnetRead(1);
@ -1261,16 +1286,25 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
assertEquals(1, data.length);
data = telnetRead(2);
assertEquals(2, data.length);
try {
usbIoManager.setReadTimeout(100);
fail("IllegalStateException expected");
} catch (IllegalStateException ignored) {}
usbClose();
// with timeout: write after timeout
usbOpen(true, 100);
usbParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
telnetParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
usbIoManager.writeAsync(buf);
usbIoManager.writeAsync(buf);
data = telnetRead(2);
assertEquals(2, data.length);
usbIoManager.setReadTimeout(200);
}
@Test
// Blocking read should be avoided in the UI thread, as it makes the app unresponsive.
// You better use the SerialInputOutputManager.
//
// With the change from bulkTransfer to queued requests, the read timeout has no effect
// and the call blocks until close() if no data is available!
// The change from bulkTransfer to queued requests was necessary to prevent data loss.
public void readSync() throws Exception {
public void readTimeout() throws Exception {
if (usbSerialDriver instanceof FtdiSerialDriver)
return; // periodically sends status messages, so does not block here
final Boolean[] closed = {Boolean.FALSE};
@ -1293,8 +1327,10 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
telnetParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
byte[] buf = new byte[]{1};
int len;
int len,i,j;
long time;
// w/o timeout
telnetWrite(buf);
len = usbSerialPort.read(buf, 0); // not blocking because data is available
assertEquals(1, len);
@ -1305,30 +1341,67 @@ public class DeviceTest implements SerialInputOutputManager.Listener {
len = usbSerialPort.read(buf, 0); // blocking until close()
assertEquals(0, len);
assertTrue(System.currentTimeMillis()-time >= 100);
// read() terminates in the middle of close(). An immediate open() can fail with 'already connected'
// because close() is not finished yet. Wait here until fully closed. In a real-world application
// where it takes some time until the user clicks on reconnect, this very likely is not an issue.
for(int i=0; i<=100; i++) {
// wait for usbClose
for(i=0; i<100; i++) {
if(closed[0]) break;
assertTrue("not closed in time", i<100);
Thread.sleep(1);
}
assertTrue("not closed in time", closed[0]);
// with timeout
usbOpen(false);
usbParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
telnetParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
int longTimeout = 1000;
int shortTimeout = 10;
if(usbSerialDriver instanceof Ch34xSerialDriver)
shortTimeout = 20; // too short timeout causes mysterious effects like lost telnet data
time = System.currentTimeMillis();
closed[0] = false;
Executors.newSingleThreadExecutor().submit(closeThread);
len = usbSerialPort.read(buf, 10); // timeout not used any more -> blocking until close()
len = usbSerialPort.read(buf, shortTimeout);
assertEquals(0, len);
assertTrue(System.currentTimeMillis()-time >= 100);
for(int i=0; i<=100; i++) {
if(closed[0]) break;
assertTrue("not closed in time", i<100);
Thread.sleep(1);
assertTrue(System.currentTimeMillis()-time < 100);
// no issue with slow transfer rate and short read timeout
time = System.currentTimeMillis();
for(i=0; i<50; i++) {
Thread.sleep(10);
telnetWrite(buf);
for(j=0; j<20; j++) {
len = usbSerialPort.read(buf, shortTimeout);
if (len > 0)
break;
}
assertEquals("failed after " + i, 1, len);
}
Log.i(TAG, "average time per read " + (System.currentTimeMillis()-time)/i + " msec");
if(!(usbSerialDriver instanceof CdcAcmSerialDriver)) {
int diffLen;
usbClose();
// no issue with high transfer rate and long read timeout
diffLen = readSpeedInt(5, longTimeout);
if(usbSerialDriver instanceof Ch34xSerialDriver && diffLen == -1)
diffLen = 0; // todo: investigate last packet loss
assertEquals(0, diffLen);
usbClose();
// date loss with high transfer rate and short read timeout !!!
diffLen = readSpeedInt(5, shortTimeout);
assertNotEquals(0, diffLen);
// data loss observed with read timeout up to 200 msec, e.g.
// difference at 181 len 64
// got 000020,0000021,0000030,0000031,0000032,0
// expected 000020,0000021,0000022,0000023,0000024,0
// difference at 341 len 128
// got 000048,0000049,0000066,0000067,0000068,0
// expected 000048,0000049,0000050,0000051,0000052,0
// difference at 724 len 704
// got 0000112,0000113,0000202,0000203,0000204,
// expected 0000112,0000113,0000114,0000115,0000116,
// difference at 974 len 8
// got 00231,0000232,0000234,0000235,0000236,00
// expected 00231,0000232,0000233,0000234,0000235,00
}
}

67
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/CommonUsbSerialPort.java
View File

@ -39,6 +39,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
private static final String TAG = CommonUsbSerialPort.class.getSimpleName();
private static final int DEFAULT_WRITE_BUFFER_SIZE = 16 * 1024;
private static final int MAX_READ_SIZE = 16 * 1024; // = old bulkTransfer limit
protected final UsbDevice mDevice;
protected final int mPortNumber;
@ -131,41 +132,56 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
protected abstract void closeInt();
@Override
public int read(final byte[] dest, final int timeoutMillis) throws IOException {
public int read(final byte[] dest, final int timeout) throws IOException {
if(mConnection == null) {
throw new IOException("Connection closed");
}
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");
}
mUsbRequest = request;
final UsbRequest response = mConnection.requestWait();
synchronized (this) {
final int nread;
if (timeout != 0) {
// bulkTransfer will cause data loss with short timeout + high baud rates + continuous transfer
// https://stackoverflow.com/questions/9108548/android-usb-host-bulktransfer-is-losing-data
// but mConnection.requestWait(timeout) available since Android 8.0 es even worse,
// as it crashes with short timeout, e.g.
// A/libc: Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x276a in tid 29846 (pool-2-thread-1), pid 29618 (.usbserial.test)
// /system/lib64/libusbhost.so (usb_request_wait+192)
// /system/lib64/libandroid_runtime.so (android_hardware_UsbDeviceConnection_request_wait(_JNIEnv*, _jobject*, long)+84)
// data loss / crashes were observed with timeout up to 200 msec
int readMax = Math.min(dest.length, MAX_READ_SIZE);
nread = mConnection.bulkTransfer(mReadEndpoint, dest, readMax, timeout);
} else {
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");
}
mUsbRequest = request;
final UsbRequest response = mConnection.requestWait();
synchronized (this) {
mUsbRequest = null;
}
if (response == null) {
throw new IOException("Null response");
}
nread = buf.position();
} finally {
mUsbRequest = null;
request.close();
}
if (response == null) {
throw new IOException("Null response");
}
final int nread = buf.position();
if (nread > 0) {
return readFilter(dest, nread);
} else {
return 0;
}
} finally {
mUsbRequest = null;
request.close();
}
if (nread > 0) {
return readFilter(dest, nread);
} else {
return 0;
}
}
protected int readFilter(final byte[] buffer, int len) throws IOException { return len; }
@Override
public int write(final byte[] src, final int timeoutMillis) throws IOException {
public int write(final byte[] src, final int timeout) throws IOException {
int offset = 0;
if(mConnection == null) {
@ -187,8 +203,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
writeBuffer = mWriteBuffer;
}
amtWritten = mConnection.bulkTransfer(mWriteEndpoint, writeBuffer, writeLength,
timeoutMillis);
amtWritten = mConnection.bulkTransfer(mWriteEndpoint, writeBuffer, writeLength, timeout);
}
if (amtWritten <= 0) {
throw new IOException("Error writing " + writeLength

11
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/UsbSerialPort.java
View File

@ -24,6 +24,7 @@ package com.hoho.android.usbserial.driver;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbManager;
import java.io.Closeable;
import java.io.IOException;
/**
@ -31,7 +32,7 @@ import java.io.IOException;
*
* @author mike wakerly (opensource@hoho.com)
*/
public interface UsbSerialPort {
public interface UsbSerialPort extends Closeable {
/** 5 data bits. */
public static final int DATABITS_5 = 5;
@ -117,21 +118,21 @@ public interface UsbSerialPort {
* Reads as many bytes as possible into the destination buffer.
*
* @param dest the destination byte buffer
* @param timeoutMillis the timeout for reading
* @param timeout the timeout for reading in milliseconds, 0 is infinite
* @return the actual number of bytes read
* @throws IOException if an error occurred during reading
*/
public int read(final byte[] dest, final int timeoutMillis) throws IOException;
public int read(final byte[] dest, final int timeout) throws IOException;
/**
* Writes as many bytes as possible from the source buffer.
*
* @param src the source byte buffer
* @param timeoutMillis the timeout for writing
* @param timeout the timeout for writing in milliseconds, 0 is infinite
* @return the actual number of bytes written
* @throws IOException if an error occurred during writing
*/
public int write(final byte[] src, final int timeoutMillis) throws IOException;
public int write(final byte[] src, final int timeout) throws IOException;
/**
* Sets various serial port parameters.

68
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/util/SerialInputOutputManager.java
View File

@ -21,7 +21,6 @@
package com.hoho.android.usbserial.util;
import android.hardware.usb.UsbRequest;
import android.util.Log;
import com.hoho.android.usbserial.driver.UsbSerialPort;
@ -30,8 +29,7 @@ import java.io.IOException;
import java.nio.ByteBuffer;
/**
* Utility class which services a {@link UsbSerialPort} in its {@link #run()}
* method.
* Utility class which services a {@link UsbSerialPort} in its {@link #run()} method.
*
* @author mike wakerly (opensource@hoho.com)
*/
@ -39,16 +37,16 @@ public class SerialInputOutputManager implements Runnable {
private static final String TAG = SerialInputOutputManager.class.getSimpleName();
private static final boolean DEBUG = true;
private static final int READ_WAIT_MILLIS = 200;
private static final int BUFSIZ = 4096;
private final UsbSerialPort mDriver;
/**
* default read timeout is infinite, to avoid data loss with bulkTransfer API
*/
private int mReadTimeout = 0;
private int mWriteTimeout = 0;
private final ByteBuffer mReadBuffer = ByteBuffer.allocate(BUFSIZ);
// Synchronized by 'mWriteBuffer'
private final ByteBuffer mWriteBuffer = ByteBuffer.allocate(BUFSIZ);
private final ByteBuffer mWriteBuffer = ByteBuffer.allocate(BUFSIZ); // Synchronized by 'mWriteBuffer'
public enum State {
STOPPED,
@ -56,11 +54,9 @@ public class SerialInputOutputManager implements Runnable {
STOPPING
}
// Synchronized by 'this'
private State mState = State.STOPPED;
// Synchronized by 'this'
private Listener mListener;
private State mState = State.STOPPED; // Synchronized by 'this'
private Listener mListener; // Synchronized by 'this'
private final UsbSerialPort mSerialPort;
public interface Listener {
/**
@ -69,24 +65,17 @@ public class SerialInputOutputManager implements Runnable {
public void onNewData(byte[] data);
/**
* Called when {@link SerialInputOutputManager#run()} aborts due to an
* error.
* Called when {@link SerialInputOutputManager#run()} aborts due to an error.
*/
public void onRunError(Exception e);
}
/**
* Creates a new instance with no listener.
*/
public SerialInputOutputManager(UsbSerialPort driver) {
this(driver, null);
public SerialInputOutputManager(UsbSerialPort serialPort) {
mSerialPort = serialPort;
}
/**
* Creates a new instance with the provided listener.
*/
public SerialInputOutputManager(UsbSerialPort driver, Listener listener) {
mDriver = driver;
public SerialInputOutputManager(UsbSerialPort serialPort, Listener listener) {
mSerialPort = serialPort;
mListener = listener;
}
@ -98,6 +87,29 @@ public class SerialInputOutputManager implements Runnable {
return mListener;
}
public void setReadTimeout(int timeout) {
// when set if already running, read already blocks and the new value will not become effective now
if(mReadTimeout == 0 && timeout != 0 && mState != State.STOPPED)
throw new IllegalStateException("Set readTimeout before SerialInputOutputManager is started");
mReadTimeout = timeout;
}
public int getReadTimeout() {
return mReadTimeout;
}
public void setWriteTimeout(int timeout) {
mWriteTimeout = timeout;
}
public int getWriteTimeout() {
return mWriteTimeout;
}
/*
* when writeAsync is used, it is recommended to use readTimeout != 0,
* else the write will be delayed until read data is available
*/
public void writeAsync(byte[] data) {
synchronized (mWriteBuffer) {
mWriteBuffer.put(data);
@ -155,7 +167,7 @@ public class SerialInputOutputManager implements Runnable {
private void step() throws IOException {
// Handle incoming data.
int len = mDriver.read(mReadBuffer.array(), READ_WAIT_MILLIS);
int len = mSerialPort.read(mReadBuffer.array(), mReadTimeout);
if (len > 0) {
if (DEBUG) Log.d(TAG, "Read data len=" + len);
final Listener listener = getListener();
@ -182,7 +194,7 @@ public class SerialInputOutputManager implements Runnable {
if (DEBUG) {
Log.d(TAG, "Writing data len=" + len);
}
mDriver.write(outBuff, READ_WAIT_MILLIS);
mSerialPort.write(outBuff, mWriteTimeout);
}
}