Tomu
Overview
Tomu is a tiny open-hardware board that fits inside a USB Type-A port. It is based on the Silicon Labs EFM32HG309F64 (Happy Gecko), an ARM Cortex-M0+ microcontroller running at up to 24 MHz with 64 KB of flash and 8 KB of SRAM.
Supported Features
The tomu board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
tomu/efm32hg309f64 target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M0+ CPU1 |
|
Flash controller |
on-chip |
Silicon Labs Gecko flash controller1 |
|
GPIO & Headers |
on-chip |
Silicon Labs Series 0-2 GPIO Peripheral1 |
|
on-chip |
|||
I2C |
on-chip |
Silicon Labs Series 0-2 I2C1 |
|
Interrupt controller |
on-chip |
ARMv6-M NVIC (Nested Vectored Interrupt Controller) controller1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
MTD |
on-chip |
Flash node1 |
|
Pin control |
on-chip |
Silabs Gecko Pin Controller1 |
|
Serial controller |
on-chip |
Gecko USART2 |
|
on-chip |
Gecko LEUART1 |
||
SRAM |
on-chip |
Generic on-chip SRAM1 |
|
Timer |
on-chip |
ARMv6-M System Tick1 |
|
Watchdog |
on-chip |
Silicon Labs Series 0-2 WDOG1 |
Programming and Debugging
The tomu board supports the runners and associated west commands listed below.
| flash | debug | |
|---|---|---|
| dfu-util | ✅ (default) |
The Tomu ships with the Toboot [1] USB DFU bootloader. No external programmer
is needed; flashing is done over USB using dfu-util.
Flashing
Insert the Tomu into a USB port. The board should enter DFU bootloader mode automatically (red and green LEDs blinking interchangeably).
Build and flash an application:
# From the root of the zephyr repository west build -b tomu samples/basic/blinky west flash