.. zephyr:board:: google_dragonclaw

Overview

Dragonclaw is a board created by Google for fingerprint-related functionality development. See the Dragonclaw Schematics_ for board schematics, layout and BOM.

Board has connectors for fingerprint sensors. Console is exposed over μServo connector. MCU can be flashed using μServo or SWD.

Hardware

STM32F412CGU6 UFQFPN48 package

Peripheral Mapping

USART_1 TX/RX : PA9/PA10
USART_2 TX/RX : PA2/PA3
SPI_1 CS/CLK/MISO/MOSI : PA4/PA5/PA6/PA7
SPI_2 CS/CLK/MISO/MOSI : PB12/PB13/PB14/PB15

Programming and Debugging

.. zephyr:board-supported-runners::

Build application as usual for the dragonclaw board, and flash using μServo or an external J-Link connected to J4. If μServo is used, please follow the Chromium EC Flashing Documentation_.

Debugging

Use SWD with a J-Link or ST-Link. Remember that SW2 must be set to CORESIGHT.

References

.. target-notes::

.. _Dragonclaw Schematics: https://www.chromium.org/chromium-os/dragonclaw/dragonclaw_v0.2.html

.. _Chromium EC Flashing Documentation: https://chromium.googlesource.com/chromiumos/platform/ec#Flashing-via-the-servo-debug-board