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

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 MHz (Y1). The 32.768 kHz crystal (Y2) shown on the board schematics is not mounted.

Supported Features

The holyiot_yj16019 board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Connections and IOs

LED and push button

  • Push button = P0.28

  • LED = P0.29

Programming and Debugging

The holyiot_yj16019 board supports the runners and associated west commands listed below.

flash debug

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 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/holyiot/yj16019/holyiot_yj16019.dts.

References