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Setup prerequisites and build Zephyr demo app

https://www.zephyrproject.org/doc/getting_started/getting_started.html

Install Prerequisites:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install git sudo apt install build-essential ncurses-dev doxygen dfu-util device-tree-compiler

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Download zephyr-sdk from the link below:

https://github.com/zephyrproject-rtos/meta-zephyr-sdk/releases/download/0.9.1/zephyr-sdk-0.9.1-setup.run

chmod +x zephyr-sdk-<version>-setup.run
./zephyr-sdk-<version>-setup.run

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Flashing, Running and Debugging using pyOCD

https://wiki.zephyrproject.org/view/96B-Nitrogen#Debugging_with_GDB

Install Prerequisites:

sudo apt-get install python-pip python-dev python-yaml minicom gdb-arm-none-eabi
sudo -H pip install --upgrade pip
sudo -H pip install --pre -U pyocd

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Flashing, Running and Debugging using openOCD

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Build OpenOCD: 

Follow Getting started with OpenOCD Development to build openOCD from sources.

Spawn openOCD connection to Nitrogen Board:

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Flashing an Application to 96Boards Nitrogen:

This example uses the Hello World sample with the pyOCD tools. Use the make flash build target to build your Zephyr application, invoke the pyOCD flash tool and program your Zephyr application to flash.

cd <zephyr_root_path>
. zephyr-env.sh
cd samples/hello_world/
make BOARD=96b_nitrogen

References:

• https://www.zephyrproject.org/doc/getting_started/getting_started.html
  
• https://wiki.zephyrproject.org/view/96B-Nitrogen#Debugging_with_GDB
  
• https://www.hashdefineelectronics.com/compiling-and-installing-openocd-with-cmcsis-dap-support/
• http://openocd.zylin.com/#/c/3511/
• https://patch-diff.githubusercontent.com/raw/mbedmicro/pyOCD/pull/196.diff
• https://github.com/mbedmicro/pyOCD/pull/196
• https://www.zephyrproject.org/doc/getting_started/getting_started.html
• https://www.96boards.org/documentation/IoTEdition/nitrogen/getting-started/
• http://openocd.org/doc/doxygen/html/patchguide.html#stepbystep