If you're using the Open-Q 820 Snapdragon development kit, you may run into an issue with running the executable due to a missing testsig library. From the Hexagon SDK documentation: *Dynamic shared objects are required to be digitally signed and then authenticated at runtime before they are allowed to be loaded and executed.* Generating a testsig library is necessary to run the unsigned sample library built from this project.

If the lack of a testsig library is your problem, you will see errors of the type:

appearing in adb logcat.

There are several ways to create the testsig library, the only prerequisite is Python and the correct version of the Hexagon-SDK. The following steps is one way to create this library:

1. Run adb as root: `adb root`

2. Run the command `adb shell /sys/devices/soc0/serial_number`

3. Convert the decimal number you get as output to hex

4. Run the python script: `python ${QUALCOMM_SDK}/tools/elfsigner/elfsigner.py -t $(SERIAL_NUMBER_HEX_VALUE)`

5. The output of the python script is a shared library stored in ${QUALCOMM_SDK}/tools/elfsigner/output/testsig-$(SERIAL_NUMBER_HEX_VALUE).so

6. Push the shared library to your device:

After rebooting your device, you should be able to run the sample application.