1.5 KiB
OtterPill
OtterPill is a 3$ STM32F072 devboard featuring USB 2.0 full-speed, a DFU Bootloader, a USB-PD Phy and Arduino nano alike pinout and size.
Changelog V1.2: BOM cost reduction by ~40%, PCB can be fully populated by JLCSMT, more efficient buck converter (PCB gets less warm at 20V), GND-hook for probing, Reset-Pin exposed as pad, power pads for 20V/5A
More documentation and firmware examples will be aviable soon.
Building and Flashing
Via Arduino
You can build and flash the firmware via Arduino as described here.
Via Makefile and DFU
Or you can generate a basic firmware, with HAL init and Makefile, with CubeMX. The binary can then be build with make and flashed with dfu-utils. To enter DFU mode, press and hold the Button while plugging in power.
$ make
$ dfu-util -a 0 -s 0x08000000:leave -D build/firmware.bin
Pinout
Blank example firmware
SoonTM
USB-PD example firmware
This is a working USB-PD example using ChibiOS, a new voltage can be requested by pressing the Button.
https://github.com/Jan--Henrik/USB-PD-Firmware
Shields and addons
Most Arduino shields should be compatible.
USB-to-CAN-adapter
Images
Rev 1.1
Rev 1.2
