NXP FRDM-KW41Z¶
Overview¶
The FRDM-KW41Z is a development kit enabled by the Kinetis® W series KW41Z/31Z/21Z (KW41Z) family built on ARM® Cortex®-M0+ processor with integrated 2.4 GHz transceiver supporting Bluetooth® Smart/Bluetooth® Low Energy (BLE) v4.2, Generic FSK, IEEE® 802.15.4 and Thread.
The FRDM-KW41Z kit contains two Freedom boards that can be used as a development board or a shield to connect to a host processor. The FRDM-KW41Z is form-factor compatible with the Arduino™ R3 pin layout for more expansion options.
The FRDM-KW41Z highly-sensitive, optimized 2.4 GHz radio features a PCB F-antenna which can be bypassed to test via SMA connection, multiple power supply options, push/capacitive touch buttons, switches, LEDs and integrated sensors.
Hardware¶
- Can be configured as Host or Shield for connection to Host Processor
- Supports all DC-DC configurations (Buck, Boost, Bypass)
- PCB inverted F-type antenna
- SMA RF Connector
- RF regulatory certified
- Serial Flash for OTA firmware upgrades
- On board NXP FXOS8700CQ digital sensor, 3D Accelerometer (±2g/±4g/±8g) + 3D Magnetometer
- OpenSDA and JTAG debug
For more information about the KW41Z SoC and FRDM-KW41Z board:
- KW41Z Website
- KW41Z Datasheet
- KW41Z Reference Manual
- FRDM-KW41Z Website
- FRDM-KW41Z User Guide
- FRDM-KW41Z Schematics
Supported Features¶
The frdm_kw41z 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 |
| UART | on-chip | serial port-polling; serial port-interrupt |
| FLASH | on-chip | soc flash |
| SENSOR | off-chip | fxos8700 polling: fxos8700 trigger |
The default configuration can be found in the defconfig file:
boards/arm/frdm_kw41z/frdm_kw41z_defconfig
Other hardware features are not currently supported by the port.
Connections and IOs¶
The KW41Z SoC has three pairs of pinmux/gpio controllers, but only two are currently enabled (PORTA/GPIOA and PORTC/GPIOC) for the FRDM-KW41Z board.
| Name | Function | Usage |
|---|---|---|
| PTC1 | GPIO | Red LED / FXOS8700 INT1 |
| PTA19 | GPIO | Green LED |
| PTA18 | GPIO | Blue LED |
| PTC2 | I2C1_SCL | I2C / FXOS8700 |
| PTC3 | I2C1_SDA | I2C / FXOS8700 |
| PTC4 | GPIO | SW3 |
| PTC5 | GPIO | SW4 |
| PTC6 | LPUART0_RX | UART Console |
| PTC7 | LPUART0_TX | UART Console |
System Clock¶
The KW41Z 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 KW41Z SoC has one UART, which is used for the console.
Programming and Debugging¶
The FRDM-KW41Z includes the NXP OpenSDA serial and debug adapter built into the board to provide debugging, flash programming, and serial communication over USB.
The pyOCD tools do not yet support the KW41Z SoC.
To use the Segger J-Link tools with OpenSDA, follow the instructions in the Segger J-Link page using the Segger J-Link OpenSDA V2.1 Firmware.
Flashing¶
The Segger J-Link firmware does not support command line flashing, therefore
the make flash build target is not supported.
Debugging¶
This example uses the Hello World sample with the
Segger J-Link tools. Use the make debug build target to build
your Zephyr application, invoke the J-Link GDB server, attach a GDB client, and
program your Zephyr application to flash. It will leave you at a gdb prompt.
$ cd <zephyr_root_path>
$ . zephyr-env.sh
$ cd samples/hello_world/
$ make BOARD=frdm_kw41z DEBUG_SCRIPT=jlink.sh debug