Dragonclaw Development Board
Overview
Dragonclaw is a board created by Google for fingerprint-related functionality development. See the Dragonclaw Schematics [1] 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
The google_dragonclaw board supports the runners and associated west commands listed below.
| flash | debug | attach | rtt | debugserver | |
|---|---|---|---|---|---|
| jlink | ✅ | ✅ | ✅ | ✅ | ✅ |
| openocd | ✅ (default) | ✅ (default) | ✅ | ✅ | ✅ |
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 [2].
Debugging
Use SWD with a J-Link or ST-Link. Remember that SW2 must be set to CORESIGHT.