Hexiwear KW40Z

Overview

See Hexiwear for a general overview of the Hexiwear board and the main application SoC, the K64. The KW40Z is a secondary SoC on the board that provides wireless connectivity with a multimode BLE and 802.15.4 radio.

For more information about the KW40Z SoC:

Supported Features

The hexiwear_kw40z 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

ADC

on-chip

adc

UART

on-chip

serial port-polling; serial port-interrupt

RTT

on-chip

console

FLASH

on-chip

soc flash

The default configuration can be found in the defconfig file:

boards/arm/hexiwear_kw40z/hexiwear_kw40z_defconfig

Other hardware features are not currently supported by the port.

Connections and IOs

The KW40Z SoC has three pairs of pinmux/gpio controllers, but only one is currently enabled (PORTC/GPIOC) for the hexiwear_kw40z board.

Name

Function

Usage

PTB1

ADC

ADC0 channel 1

PTC6

UART0_RX

UART BT HCI

PTC7

UART0_TX

UART BT HCI

System Clock

The KW40Z SoC is configured to use the 32 MHz external oscillator on the board with the on-chip FLL to generate a 40 MHz system clock.

Serial Port

The KW40Z SoC has one UART, which is used for BT HCI. There is no UART available for a console.

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, but because Segger RTT is required for a console, you must reconfigure the board for one of the following debug probes instead.

Configuring a Console

The console is available using Segger RTT.

Connect a USB cable from your PC to CN1.

Once you have started a debug session, run telnet:

$ telnet localhost 19021
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
SEGGER J-Link V6.44 - Real time terminal output
J-Link OpenSDA 2 compiled Feb 28 2017 19:27:57 V1.0, SN=621000000
Process: JLinkGDBServerCLExe

Flashing

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b hexiwear_kw40z 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 hexiwear_kw40z 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! hexiwear_kw40z

Debugging

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b hexiwear_kw40z samples/hello_world
west debug

Run telnet as shown earlier, step through the application in your debugger, and you should see the following message in the terminal:

***** Booting Zephyr OS v1.14.0-rc1 *****
Hello World! hexiwear_kw40z