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usb-serial-for-android: Use wakelock

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Android takes some pretty hard measures to save power, including
shutting down the CPU. Since this can interfer with the download from an
usb serial device, we now use a wakelock to keep the CPU running during
download.

Signed-off-by: Christof Arnosti <charno@charno.ch>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Christof Arnosti 2020-03-14 17:31:51 +01:00 • committed by Dirk Hohndel
parent a34a81d120
commit 779b84bfa0
2 changed files with 10 additions and 0 deletions
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1
android-mobile/AndroidManifest.xml
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@ -92,6 +92,7 @@
android:normalScreens="true"
android:smallScreens="true" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<!--
The following comment will be replaced upon deployment with default permissions based on the dependencies of the application.
Remove the comment if you do not require these default permissions.

9
android-mobile/src/org/subsurfacedivelog/mobile/AndroidSerial.java
View file

@ -5,6 +5,8 @@ import com.hoho.android.usbserial.driver.*;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbDevice;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.content.Context;
import android.util.Log;
@ -69,6 +71,7 @@ public class AndroidSerial {
private UsbSerialPort usbSerialPort;
private int timeout = 0;
private LinkedList<Byte> readBuffer = new LinkedList<Byte>();
private WakeLock wakeLock = null;
private static String printQueue(LinkedList<Byte> readBuffer)
{
@ -83,6 +86,10 @@ public class AndroidSerial {
private AndroidSerial(UsbSerialPort usbSerialPort)
{
this.usbSerialPort = usbSerialPort;
PowerManager powerManager = (PowerManager) SubsurfaceMobileActivity.getAppContext().getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Subsurface::AndroidSerialWakelock");
wakeLock.acquire();
}
public static AndroidSerial open_android_serial(UsbDevice usbDevice, String driverClassName)
@ -320,6 +327,8 @@ public class AndroidSerial {
Log.d(TAG, "in " + Thread.currentThread().getStackTrace()[2].getMethodName());
try {
usbSerialPort.close();
if(wakeLock != null)
wakeLock.release();
return AndroidSerial.DC_STATUS_SUCCESS;
} catch (Exception e) {
Log.e(TAG, "Error in " + Thread.currentThread().getStackTrace()[2].getMethodName(), e);