ottojo/otterpill_zephyr

Zephyr support for the OtterPill board

OtterPill

Overview

STM32F072 devboard with USB 2.0 and USB-PD capability in Arduino Nano form factor. More information about the board can be found in the OtterPill GitHub Repo [1].

Hardware

The OtterPill features an STM32F072, a FUSB302B USB Type-C controller and a 3.3V regulator with up to 27V input range. Pinout and size are Arduino Nano compatible.

Supported Features

The OtterPill board supports the following hardware features:

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
I2C	on-chip	i2c controller
USB	on-chip	USB device

Pin Mapping

For a diagram, refer to the Pinout section in the OtterPill README [2].

Default Zephyr Peripheral Mapping:

• UART_1_TX : PA9
• UART_1_RX : PA10
• I2C1_SCL : PB6
• I2C1_SDA : PB7
• SPI2_SCK : PB13
• SPI2_MISO : PB14
• SPI2_MOSI : PB15

This corresponds to where UART, I2C and SPI are on the Arduino Nano pinout, but those can be remapped to other pins on this board.

I2C2 is used internall to connect the FUSB302B USB-PD controller to the STM32.

One user-programmable LED is available as led0 and the DFU button is available for general use as sw0.

Programming and Debugging

Flashing

The board can be flashed via USB with dfu-util by holding the DFU button while plugging in power. Alternatively, it can be flashed via the SWD pins with openocd, which is configured by default to use an STLink programmer.

Debugging

Using the SWD interface and an STLink programmer, you can debug the board as described in :ref:`west-debugging`.

References

[1]	https://github.com/Jana-Marie/OtterPill

[2]	https://github.com/Jana-Marie/OtterPill#pinout