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NXP USB-KW24D512¶

Overview¶

The USB-KW24D512 is an evaluation board in a convenient USB dongle form factor based on the NXP MKW24D512 System-in-Package (SiP) device (KW2xD wireless MCU series). MKW24D512 wireless MCU provides a low-power, compact device with integrated IEEE 802.15.4 radio. The board can be used as a packet sniffer, network node, border router or as a development board.

Hardware¶

Kinetis KW2xD-2.4 GHz 802.15.4 Wireless Radio Microcontroller (50 MHz, 512 KB flash memory, 64 KB RAM, low-power, crystal-less USB)
USB Type A Connector
Two blue LEDs
One user push button
One reset button
Integrated PCB Folded F-type antenna
10-pin (0.05”) JTAG debug port for target MCU

For more information about the KW2xD SiP and USB-KW24D512 board:

Supported Features¶

The USB-KW24D512 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
UART	on-chip	serial port-polling; serial port-interrupt
FLASH	on-chip	soc flash
USB	on-chip	USB device

The default configuration can be found in the defconfig file:

boards/arm/usb_kw24d512/usb_kw24d512_defconfig

Other hardware features are not currently supported by the port.

Connections and IOs¶

The KW2xD SoC has five pairs of pinmux/gpio controllers.

Name	Function	Usage
PTA1	UART0_RX	UART Console
PTA2	UART0_TX	UART Console
PTC4	GPIO	SW1
PTD4	GPIO	Blue LED (D2)
PTD5	GPIO	Blue LED (D3)
PTB10	SPI1_PCS0	internal connected to MCR20A
PTB11	SPI1_SCK	internal connected to MCR20A
PTB16	SPI1_SOUT	internal connected to MCR20A
PTB17	SPI1_SIN	internal connected to MCR20A
PTB19	GPIO	internal connected to MCR20A (Reset)
PTB3	GPIO	internal connected to MCR20A (IRQ_B)
PTC0	GPIO	internal connected to MCR20A (GPIO5)

System Clock¶

USB-KW24D512 contains 32 MHz oscillator crystal, which is connected to the clock pins of the radio transceiver. The MCU is configured to use the 4 MHz external clock from the transceiver with the on-chip PLL to generate a 48 MHz system clock.

Serial Port¶

The KW2xD SoC has three UARTs. One is configured and can be used for the console, but it uses the same pins as the JTAG interface and is only accessible via the JTAG SWD connector.

USB¶

The KW2xD SoC has a USB OTG (USBOTG) controller that supports both device and host functions. Only USB device function is supported in Zephyr at the moment. The USB-KW24D512 board has a USB Type A connector and can only be used in device mode.

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 J-Link External Debug Probe.

J-Link External Debug Probe ¶

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

Attach a J-Link 10-pin connector to J1.

Configuring a Console¶

The console is available using Segger RTT.

Connect a USB cable from your PC to J5.

Once you have started a debug session, run telnet:

Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
SEGGER J-Link V6.44 - Real time terminal output
SEGGER J-Link ARM V10.1, SN=600111924
Process: JLinkGDBServerCLExe

Flashing¶

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b usb_kw24d512 samples/hello_world
west flash

The Segger RTT console is only available during a debug session. Use attach to start one:

# From the root of the zephyr repository
west build -b usb_kw24d512 samples/hello_world
west attach

Run telnet as shown earlier, and you should see the following message in the terminal:

***** Booting Zephyr OS v1.14.0-rc1 *****
Hello World! usb_kw24d512

Debugging¶