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NXP FRDM-K82F

Overview

The FRDM-K82F is a low-cost development platform for Kinetis K80, K81, and K82 MCUs.

Form-factor compatible with the Arduino R3 pin layout
Peripherals enable rapid prototyping, including a six-axis digital accelerometer and magnetometer to create full eCompass capabilities, a tri-colored LED and two user push-buttons for direct interaction, 2x32 Mb QuadSPI external flash, FlexIO camera header, touchpads and headers for use with Bluetooth and 2.4 GHz radio add-on modules
OpenSDAv2.1, the NXP open source hardware embedded serial and debug adapter running an open source bootloader, offers options for serial communication, flash programming, and run-control debugging

Hardware

MK82FN256VLL15 MCU (150 MHz, 256 KB flash memory, 256 KB RAM, low-power, crystal-less USB, and 100 Low profile Quad Flat Package (LQFP))
Dual role USB interface with micro-B USB connector
RGB LED
FXOS8700CQ accelerometer and magnetometer
Two user push buttons
2x 32 Mb QSPI flash
Flexible power supply option - OpenSDAv2.1 USB, Kinetis K82 USB, and external source
Easy access to MCU input/output through Arduino R3 compatible I/O connectors
Programmable OpenSDAv2.1 debug circuit supporting the CMSIS-DAP Interface software that provides:
- Mass storage device (MSD) flash programming interface
- CMSIS-DAP debug interface over a driver-less USB HID connection providing run-control debugging and compatibility with IDE tools
- Virtual serial port interface
- Open source CMSIS-DAP software project
FlexIO header

For more information about the K82F SoC and FRDM-K82F board:

Supported Features

The frdm_k82f board configuration supports the following hardware features:

Interface	Controller	Driver/Component
NVIC	on-chip	nested vector interrupt controller
SYSTICK	on-chip	systick
PINMUX	on-chip	pinmux
ADC	on-chip	adc
FLASH	on-chip	soc flash
FLASH	off-chip	QSPI flash
GPIO	on-chip	gpio
I2C	on-chip	i2c
PWM	on-chip	pwm
RTC	on-chip	rtc
SENSOR	off-chip	fxos8700 polling; fxos8700 trigger
SPI	on-chip	spi
UART	on-chip	serial port-polling; serial port-interrupt
USB	on-chip	USB device
WATCHDOG	on-chip	watchdog

The default configuration can be found in the defconfig file:

boards/arm/frdm_k82f/frdm_k82f_defconfig

Other hardware features are not currently supported by the port.

System Clock

The K82F SoC is configured to use the 12 MHz external oscillator on the board with the on-chip PLL to generate a 120 MHz system clock.

Serial Port

The K82F SoC has five UARTs. One is configured for the console, the remaining ones are not used.

USB

The K82F SoC has a USB OTG (USBOTG) controller that supports both device and host functions through its micro USB connector (J11). Only USB device function is supported in Zephyr at the moment.

Programming and Debugging

Build and flash applications as usual (see Building an Application and Run an Application for more details).

Configuring a Debug Probe

A debug probe is used for both flashing and debugging the board. This board is configured by default to use the OpenSDA DAPLink Onboard Debug Probe.

Early versions of this board have an outdated version of the OpenSDA bootloader and require an update. Please see the DAPLink Bootloader Update page for instructions to update from the CMSIS-DAP bootloader to the DAPLink bootloader.

Option 1: OpenSDA DAPLink Onboard Debug Probe (Recommended)

Install the pyOCD Debug Host Tools and make sure they are in your search path.

Follow the instructions in OpenSDA DAPLink Onboard Debug Probe to program the OpenSDA DAPLink FRDM-K82F Firmware.

Option 2: OpenSDA J-Link Onboard Debug Probe 

Install the J-Link Debug Host Tools and make sure they are in your search path.

Follow the instructions in OpenSDA J-Link Onboard Debug Probe to program the OpenSDA J-Link Firmware for FRDM-K82F.

Add the arguments -DBOARD_FLASH_RUNNER=jlink and -DBOARD_DEBUG_RUNNER=jlink when you invoke west build to override the default runner from pyOCD to J-Link:

# From the root of the zephyr repository
west build -b frdm_k82f samples/hello_world -- -DBOARD_FLASH_RUNNER=jlink -DBOARD_DEBUG_RUNNER=jlink

Configuring a Console

Regardless of your choice in debug probe, we will use the OpenSDA microcontroller as a usb-to-serial adapter for the serial console.

Connect a USB cable from your PC to J5.

Use the following settings with your serial terminal of choice (minicom, putty, etc.):

Speed: 115200
Data: 8 bits
Parity: None
Stop bits: 1

Flashing

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b frdm_k82f samples/hello_world
west flash

Open a serial terminal, reset the board (press the SW1 button), and you should see the following message in the terminal:

***** Booting Zephyr OS v1.14.0-xxx-gxxxxxxxxxxxx *****
Hello World! frdm_k82f

Debugging