How to Build a Heart Rate Monitor Using Zephyr* on the Arduino 101* (branded Genuino 101* outside the U.S.) on Ubuntu* under VMware*

Introduction

This article is an extension of Flashing the Zephyr* Application Using a JTAG Adapter on the Arduino 101*. It demonstrates to new users how to build a heart rate monitor using Zephyr* on the X86, and ARC processors on an Arduino 101* platform. This is done with Ubuntu* in a VMware* workstation using a JTAG adapter. The JTAG adapter method enables engineers to perform advanced development and debugging on the Arduino 101 platform through a small number of dedicated pins.

Hardware Components

The hardware components used in this project are listed below:

• Arduino 101 module
• Two standard A plug to B plug USB cable
• A FlySwatter2
• An ARM-JTAG-20-10 ARM Micro JTAG adapter

• Jarv RunBT (optional)

• Grove-LCD RGB Backlight (optional)

Setting up a VMware Workstation on Ubuntu*

Go to the VMware website to download and install the latest VMware Workstation player for Windows*. Browse to the Ubuntu website to download the latest version of Ubuntu Desktop. Open VMware and create a new virtual machine using the downloaded Ubuntu image. Check virtualization settings in your computer’s BIOS to ensure they are enabled, otherwise VMware will not work.

Set up a Development Environment for Zephyr* on Ubuntu* under VMware*

Ensure the Ubuntu OS is up to date and install dependent Ubuntu packages.

Install the Zephyr Software Development (SDK) kit and run the installation binary.

When the “Enter target directory for SDK” prompt is displayed, enter the directory where you want to store the zephyr SDK.

Export the Zephyr SDK environment variables. The following ZEPHYR_SDK_INSTALL_DIR assumes the zephyr SDK area is =~/zephyr-sdk.

Save the Zephyr SDK environment variables for later use in new sessions.

Building the Heart Rate Monitor on Zephyr

Git clone a repository to the Ubuntu.

Navigate to the Zephyr project directory and set the project environment variables.

Connecting FlySwatter2 to Arduino 101* (branded Genuino 101* outside the U.S.)

The first step is to connect the ARM micro JTAG connector to the FlySwatter2. Then, connect the FlySwatter2 to the Arduino 101 micro JRAG connector. The small white dot beside the micro JTAG header on the Arduinio 101 indicates the location of pin one. Insert one of the cable so it matches the dot. For more information on locating the micro JTAG connector on the Arduino 101, visit https://www.zephyrproject.org/doc/1.4.0/board/arduino_101.html.

Figure 1: Connect FlySwatter2* to Arduino 101* using ARM* Micro JTAG Connector.

A Hardware Abstraction Layer (HAL) allows the computer operating system to interact with a hardware device. Add your username to HAL layer interaction permissions to control the FlySwatter2.

$ sudo usermod –a –G plugdev $USERNAME

Grant members of the plugdev group permission to control the FlySwatter2.

$ sudo vi /etc/udev/rules.d/99-openocd.rules
$ # TinCanTools FlySwatter2
$ ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6010", MODE="664", GROUP="plugdev"

Reload udev rules to apply the new udev rule without restarting the system.

$ sudo  udevadm control --reload-rules

$ dmesg | grep FTDI

$ cd zephyr
$ make pristine
$ make BOARD=arduino_101_factory

$ make BOARD=arduino_101_factory flash

$ cd heartrate-monitor
$ make pristine
$ make BOARD=arduino_101_sss_factory

$ make BOARD=arduino_101_sss_factory flash

$ sudo usermod -a -G plugdev $USERNAME

$ sudo vi /etc/udev/rules.d/99-openocd.rules
$ # TinCanTools FlySwatter2
$ ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6010", MODE="664", GROUP="plugdev"

$ dmesg | grep FTDI