Google Kukui EC
Overview
Kukui is a reference board for Chromium OS-based devices Krane and Kodama. These are known as the Lenovo Chromebook Duet and 10e Chromebook Tablet, respectively.
Zephyr has support for the STM32-based embedded controller (EC) on-board.
Hardware
STM32F098RCH6
MT6370 battery charger
BMM150 compass
BMM160 gyroscope
Connections to the MediaTek AP
Supported Features
The following features are supported:
Interface |
Controller |
Driver/Component |
|---|---|---|
NVIC |
on-chip |
nested vector interrupt controller |
UART |
on-chip |
serial port-polling; serial port-interrupt |
PINMUX |
on-chip |
pinmux |
GPIO |
on-chip |
gpio |
CLOCK |
on-chip |
reset and clock control |
FLASH |
on-chip |
flash memory |
WATCHDOG |
on-chip |
independent watchdog |
Other features (such as I2C) are not available in Zephyr.
The default configuration can be found in the defconfig file:
boards/arm/google_kukui/google_kukui_defconfig
Connections and IOs
Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as input (with or without pull-up or pull-down), or as peripheral alternate function.
Default Zephyr Peripheral Mapping:
UART_1 TX/RX : PA10/PA9
I2C_1 SCL/SDA : PB8/PB9
I2C_2 SCL/SDA : PA11/PA12
Volume down : GPIOB pin 11
Volume up : GPIOB pin 10
Power : GPIOA pin 0
Programming and Debugging
Build application as usual for the google_kukui board, and flash
using Servo V2, μServo, or Servo V4 (CCD). See the
Chromium EC Flashing Documentation 1 for more information.
Debugging
Use SWD with a J-Link or ST-Link.