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Merge pull request #170 from kai-morich/ftdi-async 

enable async read for FTDI + prevent loss of last packet if full
pull/212/head
kai-morich 2019-10-04 16:49:03 +02:00 zatwierdzone przez GitHub
rodzic deabc510c1 fcd8596bdd
commit eb2de17af8
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ID klucza GPG: 4AEE18F83AFDEB23
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47
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/FtdiSerialDriver.java
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@ -26,6 +26,7 @@ import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbRequest;
import android.os.Build;
import android.util.Log;
import com.hoho.android.usbserial.util.HexDump;
@ -190,10 +191,11 @@ public class FtdiSerialDriver implements UsbSerialDriver {
* 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;
private final boolean mEnableAsyncReads;
public FtdiSerialPort(UsbDevice device, int portNumber) {
super(device, portNumber);
mEnableAsyncReads = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1);
}
@Override
@ -210,10 +212,10 @@ public class FtdiSerialDriver implements UsbSerialDriver {
* @return The number of payload bytes
*/
private final int filterStatusBytes(byte[] src, byte[] dest, int totalBytesRead, int maxPacketSize) {
final int packetsCount = totalBytesRead / maxPacketSize + (totalBytesRead % maxPacketSize == 0 ? 0 : 1);
final int packetsCount = (totalBytesRead + maxPacketSize -1 )/ maxPacketSize;
for (int packetIdx = 0; packetIdx < packetsCount; ++packetIdx) {
final int count = (packetIdx == (packetsCount - 1))
? (totalBytesRead % maxPacketSize) - MODEM_STATUS_HEADER_LENGTH
? totalBytesRead - packetIdx * maxPacketSize - MODEM_STATUS_HEADER_LENGTH
: maxPacketSize - MODEM_STATUS_HEADER_LENGTH;
if (count > 0) {
System.arraycopy(src,
@ -280,33 +282,30 @@ public class FtdiSerialDriver implements UsbSerialDriver {
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);
}
if (mEnableAsyncReads) {
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.");
try {
request.initialize(mConnection, endpoint);
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");
}
} finally {
request.close();
}
final UsbRequest response = mConnection.requestWait();
if (response == null) {
throw new IOException("Null response");
final int totalBytesRead = buf.position();
if (totalBytesRead < MODEM_STATUS_HEADER_LENGTH) {
throw new IOException("Expected at least " + MODEM_STATUS_HEADER_LENGTH + " bytes");
}
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;
}
return filterStatusBytes(dest, dest, totalBytesRead, endpoint.getMaxPacketSize());
} else {
final int totalBytesRead;