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 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 have not been enabled yet for this board.

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

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.