The latest development version of this page may be more current than this released 2.2.0 version.

Holyiot YJ-16019

Overview

The Holyiot 1 YJ-16019 hardware provides support for the Nordic Semiconductor nRF52832 ARM Cortex-M4 CPU and the following devices:

  • CLOCK

  • FLASH

  • GPIO

  • MPU

  • NVIC

  • PWM

  • RADIO (Bluetooth Low Energy)

  • RTC

  • Segger RTT (RTT Console)

  • WDT

Holyiot YJ-16019

Holyiot YJ-16019 (Credit: Holyiot)

The board is equipped with one LED, one push button, and is powered by a CR2032 coin cell. The Nordic Semiconductor Infocenter 2 contains the processor’s information and the datasheet.

Hardware

The nRF52832 of the Holyiot YJ-16019 is clocked by an external crystal with a frequency of 32.768 kHz.

Supported Features

The holyiot_yj16019 board configuration supports the following hardware features:

Interface

Controller

Driver/Component

CLOCK

on-chip

clock_control

FLASH

on-chip

flash

GPIO

on-chip

gpio

MPU

on-chip

arch/arm

NVIC

on-chip

arch/arm

PWM

on-chip

pwm

RADIO

on-chip

Bluetooth

RTC

on-chip

system clock

RTT

Segger

console

WDT

on-chip

watchdog

Other hardware features are not supported by the Zephyr kernel.

Connections and IOs

LED and push button

  • Push button = P0.28

  • LED = P0.29

Programming and Debugging

Applications for the holyiot_yj16019 board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details); however, an external Segger J-Link is required since the board does not have any on-board debug IC.

The following pins of the Segger J-Link must be connected to the following test pads on the PCB (see image):

  • VTref = VCC

  • GND = GND

  • SWDIO = SDO

  • SWCLK = SCK

Holyiot YJ-16019 PCB

Holyiot YJ-16019 PCB (Credit: Holyiot)

Flashing

Follow the instructions in the Nordic nRF5x Segger J-Link page to install and configure all the necessary software. Further information can be found in Flashing. Then build and flash applications as usual (see Building an Application and Run an Application for more details).

Here is an example for the Blinky sample application.

# From the root of the zephyr repository
west build -b holyiot_yj16019 samples/basic/blinky
west flash

Debugging

Refer to the Nordic nRF5x Segger J-Link page to learn about debugging Nordic nRF52x-based boards with a Segger debugger.

Testing the LED and button on the Holyiot YJ-16019

There are 2 samples that allow you to test that the button and LED on the board are working properly with Zephyr:

samples/basic/blinky
samples/basic/button

You can build and flash the examples to make sure Zephyr is running correctly on your board. The button and LED definitions can be found in boards/arm/holyiot_yj16019/holyiot_yj16019.dts.