Ambiq Apollo4 Blue Plus KXR EVB

Apollo4 Blue Plus KXR EVB is a board by Ambiq featuring their ultra-low power Apollo4 Blue Plus SoC.

Hardware

• Apollo4 Blue Plus SoC with upto 192 MHz operating frequency

• ARM® Cortex® M4F core

• 64 kB 2-way Associative/Direct-Mapped Cache per core

• Up to 2 MB of non-volatile memory (NVM) for code/data

• Up to 2.75 MB of low leakage / low power RAM for code/data

• 384 kB Tightly Coupled RAM

• 384 kB Extended RAM

• Bluetooth 5.1 Low Energy

For more information about the Apollo4 Blue Plus SoC and Apollo4 Blue Plus KXR EVB board:

• Apollo4 Blue Plus Website

• Apollo4 Blue Plus Datasheet

• Apollo4 Blue Plus KXR EVB Website

Supported Features

The Apollo4 Blue Plus KXR EVB board configuration supports the following hardware features:

Interface	Controller	Driver/Component
MPU	on-chip	memory protection unit
NVIC	on-chip	nested vector interrupt controller
SYSTICK	on-chip	systick
STIMER	on-chip	stimer
GPIO	on-chip	gpio
UART	on-chip	serial
WDT	on-chip	watchdog
SPI(M)	on-chip	spi
I2C(M)	on-chip	i2c
CLOCK	on-chip	clock_control
RADIO	on-chip	bluetooth

The default configuration can be found in the defconfig file: boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb_defconfig.

Programming and Debugging

Flashing an application

Connect your device to your host computer using the JLINK USB port. The sample application Hello World is used for this example. Build the Zephyr kernel and application, then flash it to the device:

# From the root of the zephyr repository
west build -b apollo4p_blue_kxr_evb samples/hello_world
west flash

Note

west flash requires SEGGER J-Link software and pylink Python module to be installed on you host computer.

Open a serial terminal (minicom, putty, etc.) with the following settings:

• Speed: 115200

• Data: 8 bits

• Parity: None

• Stop bits: 1

Reset the board and you should be able to see on the corresponding Serial Port the following message:

Hello World! apollo4p_blue_kxr_evb