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openlabs.co kw41z-mini board

Support for openlabs-kw41z-mini. More...

Detailed Description

Support for openlabs-kw41z-mini.

General information

This is an open-source development board shipped by openlabs.co with source files located at https://openlabs.co/OSHW/kw41z-mini

A driver for the radio transceiver is available in #12277 (802.15.4 only).

A version of this board exists that comes with the M41W8VT4 (256k ROM) instead of the M41W9VT4 (512k ROM). The boards are otherwise identical. See openlabs.co kw41z-mini-256kib board if you happen to have this version.

Programming Pinout

Programming and debugging can be done with a Raspberry Pi (or equivalent) running OpenOCD.

   Pi GPIO Pins       kw41z-mini
   GPIO_19 ------||------- RST
   GPIO_20 ------||------- SWDCLK
   GPIO_21 ------||------- SWDIO
     3.3V -------||------- 3.3V
      GND -------||------- GND

Compiling and Flashing

install build deps for openocd

apt install git build-essential libtool automake

fetch and build openocd with support for JTAG via RPi or generic GPIO

git clone https://github.com/beduino-project/openocd.git
cd openocd
./configure --enable-bcm2835gpio --enable-sysfsgpio
make -j4 && sudo make install

install arm toolchain

apt install git gcc-arm-none-eabi gdb-arm-none-eabi

fetch Riot

git clone https://github.com/RIOT-OS/RIOT.git

build and flash the gnrc_networking example

cd RIOT/examples/gnrc_networking
BOARD=openlabs-kw41z-mini CFLAGS+="-DKW41ZRF_ENABLE_LEDS=1" make -j4 flash

Debug Uart Pinout

It is also possible to use the Pi for connecting to the debug uart.

   Pi GPIO Pins     kw41z-mini
    UART TX ----||------ RXI
    UART RX ----||------ TXO
      GND ------||------ GND

enable the uart on the Pi

echo "enable_uart=1" >> /boot/config.txt

install serial terminal

apt install picocom

run serial terminal to access debug uart

picocom -b115200 /dev/serial0

It is recommended (if possible) to switch the Pi to the better-clocked uart for higher baud rates:

echo "dtoverlay=disable-bt" >> /boot/config.txt


To get a working radio, add #12277 and uncomment the lines in boards/openlabs-kw41z-mini/Makefile.dep

The DAC output is on pin PTB18.

ADC input A3 needs a hack applied to cpu/kinetis/periph/adc.c to remove ADC_CFG2_MUXSEL_MASK from CFG2 to switch to the correct mux setting.

The PWM peripheral on this board isn't supported in the Kinetis PWM driver yet.

Use external I2C pullup resistors if I2C is used.


file  adc_params.h
 Board specific configuration of direct mapped ADC.
file  board.h
 Board specific definitions for openlabs-kw41z-mini.
file  gpio_params.h
 Board specific configuration of direct mapped GPIOs.
file  periph_conf.h