pebble/third_party/jerryscript/targets/zephyr

About

This folder contains files to integrate JerryScript with Zephyr RTOS to run on a number of supported boards (like Arduino 101 / Genuino 101, Zephyr Arduino 101).

How to build

1. Preface

1. Directory structure

Assume harmony as the path to the projects to build. The folder tree related would look like this.

harmony
  + jerryscript
  |  + targets
  |      + zephyr
  + zephyr-project

2. Target boards/emulations

Following Zephyr boards were tested: qemu_x86, qemu_cortex_m3, arduino_101, frdm_k64f.

2. Prepare Zephyr

Follow this page to get the Zephyr source and configure the environment.

If you just start with Zephyr, you may want to follow "Building a Sample Application" section in the doc above and check that you can flash your target board.

Remember to source the Zephyr environment as explained in the zephyr documenation:

cd zephyr-project
source zephyr-env.sh

export ZEPHYR_GCC_VARIANT=zephyr
export ZEPHYR_SDK_INSTALL_DIR=<sdk installation directory>

3. Build JerryScript for Zephyr

The easiest way is to build and run on a QEMU emulator:

For x86 architecture:

make -f ./targets/zephyr/Makefile.zephyr BOARD=qemu_x86 qemu

For ARM (Cortex-M) architecture:

make -f ./targets/zephyr/Makefile.zephyr BOARD=qemu_cortex_m3 qemu

4. Build for Arduino 101

# assume you are in harmony folder
cd jerryscript
make -f ./targets/zephyr/Makefile.zephyr BOARD=arduino_101_factory

This will generate the following libraries:

./build/arduino_101_factory/librelease-cp_minimal.jerry-core.a
./build/arduino_101_factory/librelease-cp_minimal.jerry-libm.lib.a
./build/arduino_101_factory/librelease.external-cp_minimal-entry.a

The final Zephyr image will be located here:

./build/arduino_101_factory/zephyr/zephyr.strip

5. Flashing

Details on how to flash the image can be found here: Flashing image (or similar page for other supported boards).

To be able to use this demo in hardware you will need the serial console which will be generating output to Pins 0 & 1.

You will need a 3.3v TTL to RS232, please follow the zephyr documentation on it.

Some examples of building the software

make -f ./targets/zephyr/Makefile.zephyr BOARD=<board> clean

• Not using a Jtag and having a factory stock Arduino 101. You can follow the Zephyr instructions to flash using the dfu-util command or use this helper:

make -f ./targets/zephyr/Makefile.zephyr BOARD=arduino_101_factory dfu-x86

Make sure you have the factory bootloader in your device to use this method or it will not flash.

• Using JTAG

There is a helper function to flash using the JTAG and Flywatter2

make -f ./targets/zephyr/Makefile.zephyr BOARD=arduino_101_factory flash

Careful if you flash the BOARD arduino_101, you will lose the bootloader and you will have to follow the zephyr documentation to get it back from the backup we all know you did at the setup.

6. Serial terminal

Test command line in a serial terminal.

You should see something similar to this:

JerryScript build: Aug 12 2016 17:12:55
JerryScript API 1.0
Zephyr version 1.4.0
js>

Run the example javascript command test function

js> var test=0; for (t=100; t<1000; t++) test+=t; print ('Hi JS World! '+test);
Hi JS World! 494550

Try a more complex function:

js> function hello(t) {t=t*10;return t}; print("result"+hello(10.5));