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nRF52840-PCA10090

Overview

The nRF52840 SoC on the nRF9160 DK (PCA10090) hardware provides support for the Nordic Semiconductor nRF52840 ARM Cortex-M4F CPU and the following devices:

  • CLOCK
  • FLASH
  • GPIO (General Purpose Input Output)
  • MPU (Memory Protection Unit)
  • NVIC (Nested Vectored Interrupt Controller)
  • PWM (Pulse Width Modulation)
  • RADIO (Bluetooth Low Energy and 802.15.4)
  • RTC (nRF RTC System Clock)
  • Segger RTT (RTT Console)
  • UART (Universal asynchronous receiver-transmitter)
  • WDT (Watchdog Timer)

The nRF52840 SoC does not have any connection to the any of the LEDs, buttons, switches, and Arduino pin headers on the PCA10090 board. It is, however, possible to route some of the pins of the nRF52840 SoC to the nRF9160 SiP.

More information about the board can be found at the Nordic Low power cellular IoT website. The Nordic Semiconductor documentation library contains the processor's information and the datasheet.

Hardware

The nRF9160 DK has two external oscillators. The frequency of the slow clock is 32.768 kHz. The frequency of the main clock is 32 MHz.

Supported Features

The nrf52840_pca10090 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, ieee802154
RTC on-chip system clock
RTT Segger console
UART on-chip serial
WDT on-chip watchdog

Programming and Debugging

Applications for the nrf52840_pca10090 board configuration can be built and flashed in the usual way (see build_an_application and application_run for more details).

Make sure that the PROG/DEBUG switch on the DK is set to nRF52.

Flashing

Follow the instructions in the nordic_segger page to install and configure all the necessary software. Further information can be found in nordic_segger_flashing. Then build and flash applications as usual (see build_an_application and application_run for more details).

Remember to set the PROG/DEBUG switch on the DK to nRF52.

See the following example for the hello_world application.

First, run your favorite terminal program to listen for output.

$ minicom -D <tty_device> -b 115200

Replace <tty_device> with the port where the nRF52840 SoC is connected to. Usually, under Linux it will be /dev/ttyACM1. The /dev/ttyACM0 port is connected to the nRF9160 SiP on the board.

Then build and flash the application in the usual way.

Debugging

Refer to the nordic_segger page to learn about debugging Nordic boards with a Segger IC.

Remember to set the PROG/DEBUG switch on the DK to nRF52.

Board controller firmware

The board controller firmware is a small snippet of code that takes care of routing specific pins on nRF9160 SiP to different components on the board, such as LEDs, switches, and specific nRF52840 SoC pins.

When compiling a project for nrf52840_pca10090, the board controller firmware will be compiled and run automatically after the Kernel has been initialized.

By default, the board controller firmware will route the following:

Component Routed to
nRF9160 UART0 VCOM0
nRF9160 UART1 VCOM2
LEDs 1-4 physical LEDs
Buttons 1-2 physical buttons
Switches 1-2 physical switches
MCU Interface 0 Arduino pin headers
MCU Interface 1 Trace interface
MCU Interface 2 COEX interface

It is possible to configure the behavior of the board controller firmware by using Kconfig and editing its options under "Board options".

References