Editing Useful stuff

== Useful commands == 

 cat /sys/devices/virtual/thermal/thermal_zone0/temp
 cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

== Android shell ==

editing the build.prop file on the system

  adb shell
  su
  mount -o remount,rw /system
  cd /
  echo &quot;persist.service.adb.enable=1&quot; &gt;&gt; default.prop 
  echo &quot;persist.service.debuggable=1&quot; &gt;&gt; default.prop
  echo &quot;persist.sys.usb.config=mtp,adb&quot; &gt;&gt; default.prop
  echo &quot;persist.service.adb.enable=1&quot; &gt;&gt; /system/build.prop 
  echo &quot;persist.service.debuggable=1&quot; &gt;&gt; /system/build.prop
  echo &quot;persist.sys.usb.config=mtp,adb&quot; &gt;&gt; /system/build.prop

debugging input devices like the touchscreen

  getevent -il // display all input devices

find the device you care about

  getevent -trl /dev/input/event0 | grep ABS_X  // for example
  getevent -l | grep event0

== Development system ==

adb install -r &lt;filename&gt;.apk

adb push &lt;local filename&gt; &lt;target filename&gt;

adb devices -l

adb -s &lt;system name&gt;

adb screencap -p /sdcard/screen.png

== OTA upgrade process ==

  rm out/target/product/hbi120/boot*
  rm out/target/product/hbi120/kernel
  make -j12 BUILD_TARGET_DEVICE=sd
  adb push out/target/product/hbi120/boot.img /dev/block/mmcblk3p1
  adb reboot

  make -j12 BUILD_TARGET_DEVICE=sd dist
  adb shell 'mkdir -p /cache/recovery'
  adb push out/dist/hbi120-ota-20160824.1441.zip /cache/update.zip
  adb shell 'echo &quot;--update_package=/cache/update.zip&quot; &gt; /cache/recovery/command'
  adb reboot recovery

== Write sdcard ==

 ./um.sh
 pushd out/target/product/hbi120
 sudo ../../../../device/fsl/common/tools/fsl-sdcard-partition_1604.sh -f imx6q /dev/sdX
 popd

== Touchscreen debugging ==

[https://github.com/atmel-maxtouch/linux/wiki/Config-Update#configuration-download atmel config]

 echo 4.8_H_640T_1.2_1WN_001.raw &gt; /sys/bus/i2c/drivers/atmel_mxt_ts/0-004a/update_cfg

mxt-app

 adb push ~/projects/Android5.1b/Android_Lolli/kernel_imx/firmware/atmel/4.8_H_640T_1.2_1WN_001.raw /sdcard/Android/data/atmel.raw
 adb push projects/mxt-app/libs/armeabi-v7a/mxt-app /data/local/tmp/
 adb shell /data/local/tmp/mxt-app --load /sdcard/Android/data/atmel.raw

kernel output when updating the atmel device

 adb shell dmesg | grep atmel
 [    5.005664] atmel_mxt_ts 0-004a: Family: 164 Variant: 2 Firmware V1.2.AA Objects: 39
 [    5.014151] atmel_mxt_ts 0-004a: Enabling RETRIGEN workaround
 [    5.104391] atmel_mxt_ts 0-004a: cfg_name atmel/4.8_H_640T_1.2_1WN_001.raw, error 0
 [    5.112140] atmel_mxt_ts 0-004a: Direct firmware load failed with error -2
 [    5.119072] atmel_mxt_ts 0-004a: Falling back to user helper
 [    5.119104] atmel_mxt_ts 0-004a: Touchscreen size2 X0Y0
 [    5.148466] atmel_mxt_ts 0-004a: fw_load_from_user_helper fw_priv -734595072
 [    5.155552] atmel_mxt_ts 0-004a: fw_load_from_user_helper fw_priv -734595072
 [    5.162621] firmware atmel!4.8_H_640T_1.2_1WN_001.raw: _request_firmware_load:
 [    7.619973] atmel_mxt_ts 0-004a: fw_load_from_user_helper ret 0
 [    7.657693] atmel_mxt_ts 0-004a: Config CRC 0xDC5CE1: does not match file 0x406817
 [    8.045181] atmel_mxt_ts 0-004a: Resetting device
 [    8.165252] atmel_mxt_ts 0-004a: Config successfully updated
 [    8.174276] atmel_mxt_ts 0-004a: multitouch t100
 [    8.186835] atmel_mxt_ts 0-004a: Touchscreen size1 X719Y1279

== Kernel debugging stuff ==

 /sys/devices/system/cpu/cpu0/cpufreq/
 /sys/devices/virtual/thermal/thermal_zone0/temp

[http://www.tldp.org/LDP/lkmpg/2.6/html/lkmpg.html Writing kernel modules]

[https://community.nxp.com/docs/DOC-93616 power management]

[http://stackoverflow.com/questions/2271272/how-can-i-change-cpu-frequency-manualy-using-sysfs-cpufreq-subsystem manual cpufreq change]

 cat /sys/fsl_otp/HW_OCOTP_CFG0
 cat /sys/fsl_otp/HW_OCOTP_CFG1

== Camera stuff ==

pm enable com.android.gallery3d/com.android.camera.CameraLauncher

https://community.nxp.com/thread/360269

== LED control from command line ==

 echo 1 &gt; /sys/class/gpio/gpio171/value
 echo 1 &gt; /sys/class/gpio/gpio174/value

== I2C debugging ==

=== probe bus ===

 i2cdetect -y 0
 i2cdetect -y 1
 i2cdetect -y 2

== pcf8563 rtc ==

[[pcf8653 driver]]

=== links ===

http://lxr.free-electrons.com/source/drivers/rtc/rtc-pcf8563.c

https://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=5&amp;ved=0ahUKEwjIzt2w9orRAhUp0oMKHUMqAx4QFgg1MAQ&amp;url=https%3A%2F%2Fstuff.mit.edu%2Fafs%2Fsipb%2Fcontrib%2Flinux%2Fdrivers%2Frtc%2Frtc-pcf8563.c&amp;usg=AFQjCNHEqK9c_2d1Qocio_ZumuOL1pvTlg&amp;sig2=E0mpKKNfW2TuydfnxO0TSg

=== dump rtc ===

@ 0x51, bus 0

 i2cdump -y -f 0 0x51 b
 i2cdump -y -f -r 0-0xf 0 0x51 b

=== clear VL (voltage low) ===

bit in Reg 0x2

 adb shell i2cset -y -f 0 0x51 2 0x80

=== Setting the time/date ===

 adb shell date -s 20161206.082400

=== reading/writing rtc ===

 busybox hwclock --show
 busybox hwclock --systohc

=== rtc clockout ===

See PCF8563.pdf doc [https://www.nxp.com/docs/en/data-sheet/PCF8563.pdf]

dumping registers:

device address 0x51, register 0x2 (seconds in rtc).  
 i2cget -f -y 8 0x51 0x2

register CLKOUT_Control, bit 7 is the enable bit for clock output. bits 0,1 select the clock output frequency
 i2cget -f -y 8 0x51 0xd
 i2cset -f -y 8 0x51 0xd 0
clear all bits in CLKOUT.

Kernel driver for PCF8563 is located at ./kernel_imx/drivers/rtc/rtc-pcf8563.c

== JNI tricks ==

How to reference java object from c++

http://journals.ecs.soton.ac.uk/java/tutorial/native1.1/implementing/example-1.1/FieldAccess.c

http://journals.ecs.soton.ac.uk/java/tutorial/native1.1/implementing/example-1.1/FieldAccess.java

=== neon integration example ===

https://github.com/googlesamples/android-ndk

== Android crashes ==

adb pull /data/anr/traces.txt

adb bugreport &gt; bugreport.txt

== USB Permission ==

=== Hack #1 ===

Add:

 public void onStart() {
    super.onStart();
    mPermissionGranted = true;
    finish();
 }

to frameworks/base/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java to bypass the the permission confirmation popup.

=== Correct way (mostly) ===

Call getUsbPermission(), it will take care of the getting permission if needed.

    private void getUsbPermission() {
        UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
        HashMap&lt;String, UsbDevice&gt; deviceList = manager.getDeviceList();
        //UsbAccessory[] accessoryList = manager.getAccessoryList();
        //if (manager.hasPermission(accessoryList[0])) {
        if (!manager.hasPermission(deviceList.get(&quot;/dev/bus/usb/001/002&quot;))) {
            BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    String action = intent.getAction();
                    if (ACTION_USB_PERMISSION.equals(action)) {
                        synchronized (this) {
                            if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                                startUsbDevice();
                            }
                        }
                    }
                }
            };
            PendingIntent pi = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
            IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
            registerReceiver(mUsbReceiver, filter);
            manager.requestPermission(deviceList.get(&quot;/dev/bus/usb/001/002&quot;), pi);
        } else {
            startUsbDevice();
        }
    }

    private void startUsbDevice() {
        AsyncTask&lt;Void, Void, Void&gt; fpgaProgressBar = new AsyncTask&lt;Void, Void, Void&gt;() {
            Boolean bFpgaLoads;
            @Override
            protected Void doInBackground(Void... params) {
                bFpgaLoads = loadFpga();
                return null;
            }
            @Override
            protected void onPostExecute(Void result) {
                if (usb.simFtdi) {
                    //textViewTitle.setBackgroundColor(Color.YELLOW);
                    //textViewTitle.setTextColor(Color.BLUE);
                    toolbar.setBackgroundColor(Color.YELLOW);
                }
                if (bFpgaLoads) {
                    // fpga load succeeded
                }  else {
                    // fpga load failed
                }

            }
        };
        fpgaProgressBar.execute();
    }

== Switching between openjdk java versions ==

List all java versions:

 update-java-alternatives --list

Set java version as default (needs root permissions):

 sudo update-java-alternatives --set /path/to/java/version
 sudo update-java-alternatives --set /usr/lib/jvm/java-1.7.0-openjdk-amd64

== Wifi debugging with Android studio ==

Don't get confused between /usr/bin/adb and /opt/android-sdk/platform-tools/adb.  If the adb is restarted, then you have to redo the connection process.  Only use one version of the tool during this process.  For now I'm using the /opt/android-sdk/platform-tools/adb only as it is a higher version than the /usr/bin/adb.

It appears that during the first set of commands you need to have the android target connected via usb until after the tcpip command.  This maybe switching communication modes on the android targets adbd as well.

 ping 192.168.1.142
 ./adb kill-server
 ./adb devices
 ./adb tcpip 5555

 ./adb connect 192.168.1.142:5555
 ./adb devices

Now I appear to be able to debug normally.  The connect command may need to be run a couple of times.

== git buffer size ==

 git config --global http.postBuffer 1048576000

== SQL debugging ==

 /data/data/com.heuresistech.hbi120/databases # sqlite3 Data
 .schema
 select * from users;

== Location of penguin's and splash screen ==

located in the kernel build

 drivers/video/logo/logo_linux_clut224.ppm

located in the android build

 device/heuresis/hbi120/overlay/frameworks/base/core/res/assets/images/android-logo-mask.png
 device/heuresis/pb200i/overlay/frameworks/base/core/res/assets/images/android-logo-shine.png

Additional tools needed

pnmnoraw
ppmquant