NXP FRDM-K64F¶

Overview¶

The Freedom-K64F is an ultra-low-cost development platform for Kinetis K64, K63, and K24 MCUs.

Form-factor compatible with the Arduino R3 pin layout
Peripherals enable rapid prototyping, including a 6-axis digital accelerometer and magnetometer to create full eCompass capabilities, a tri-colored LED and 2 user push-buttons for direct interaction, a microSD card slot, and connectivity using onboard Ethernet port and headers for use with Bluetooth* and 2.4 GHz radio add-on modules
OpenSDAv2, 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¶

MK64FN1M0VLL12 MCU (120 MHz, 1 MB 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
Flexible power supply option - OpenSDAv2 USB, Kinetis K64 USB, and external source
Easy access to MCU input/output through Arduino* R3 compatible I/O connectors
Programmable OpenSDAv2 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
Ethernet
SDHC

For more information about the K64F SoC and FRDM-K64F board:

Supported Features¶

The frdm_k64f 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
GPIO	on-chip	gpio
I2C	on-chip	i2c
SPI	on-chip	spi
WATCHDOG	on-chip	watchdog
ADC	on-chip	adc
PWM	on-chip	pwm
ETHERNET	on-chip	ethernet
UART	on-chip	serial port-polling; serial port-interrupt
FLASH	on-chip	soc flash
USB	on-chip	USB device
SENSOR	off-chip	fxos8700 polling; fxos8700 trigger
CAN	on-chip	can
RTC	on-chip	rtc

The default configuration can be found in the defconfig file:

boards/arm/frdm_k64f/frdm_k64f_defconfig

Other hardware features are not currently supported by the port.

Connections and IOs¶

The K64F SoC has five pairs of pinmux/gpio controllers.

Name	Function	Usage
PTB22	GPIO	Red LED
PTE26	GPIO	Green LED
PTB21	GPIO	Blue LED
PTC6	GPIO	SW2 / FXOS8700 INT1
PTC13	GPIO	FXOS8700 INT2
PTA4	GPIO	SW3
PTB10	ADC	ADC1 channel 14
PTB16	UART0_RX	UART Console
PTB17	UART0_TX	UART Console
PTC8	PWM	PWM_3 channel 4
PTC9	PWM	PWM_3 channel 5
PTC16	UART3_RX	UART BT HCI
PTC17	UART3_TX	UART BT HCI
PTD0	SPI0_PCS0	SPI
PTD1	SPI0_SCK	SPI
PTD2	SPI0_SOUT	SPI
PTD3	SPI0_SIN	SPI
PTE24	I2C0_SCL	I2C / FXOS8700
PTE25	I2C0_SDA	I2C / FXOS8700
PTA5	MII0_RXER	Ethernet
PTA12	MII0_RXD1	Ethernet
PTA13	MII0_RXD0	Ethernet
PTA14	MII0_RXDV	Ethernet
PTA15	MII0_TXEN	Ethernet
PTA16	MII0_TXD0	Ethernet
PTA17	MII0_TXD1	Ethernet
PTA28	MII0_TXER	Ethernet
PTB0	MII0_MDIO	Ethernet
PTB1	MII0_MDC	Ethernet
PTC16	ENET0_1588_TMR0	Ethernet
PTC17	ENET0_1588_TMR1	Ethernet
PTC18	ENET0_1588_TMR2	Ethernet
PTC19	ENET0_1588_TMR3	Ethernet

Note

Do not enable Ethernet and UART BT HCI simultaneously because they conflict on PTC16-17.

System Clock¶

The K64F SoC is configured to use the 50 MHz external oscillator on the board with the on-chip PLL to generate a 120 MHz system clock.

Serial Port¶

The K64F SoC has six UARTs. One is configured for the console, another for BT HCI, and the remaining are not used.

USB¶

The K64F SoC has a USB OTG (USBOTG) controller that supports both device and host functions through its micro USB connector (K64F USB). 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-K64F 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 Generic Firmware for V3.2 Bootloader. Note that Segger does provide an OpenSDA J-Link Board-Specific Firmware for this board, however it is not compatible with the DAPLink bootloader.

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_k64f 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 J26.

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_k64f 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-rc1 *****
Hello World! frdm_k64f

Debugging¶