EFM32 Wonder Gecko (EFM32WG-STK3800)
Overview
The EFM32 Wonder Gecko Starter Kit EFM32WG-STK3800 contains a MCU from the EFM32WG family built on ARM® Cortex®-M4F processor with excellent low power capabilities.
Hardware
Advanced Energy Monitoring provides real-time information about the energy consumption of an application or prototype design.
32MByte parallel NAND Flash
160 segment Energy Micro LCD
2 user buttons, 2 LEDs and a touch slider
Ambient Light Sensor and Inductive-capacitive metal sensor
On-board Segger J-Link USB debugger
For more information about the EFM32WG SoC and EFM32WG-STK3800 board:
Supported Features
The efm32wg_stk3800 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.
efm32wg_stk3800/efm32wg990f256 target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
Flash controller |
on-chip |
Silicon Labs Gecko flash controller1 |
|
GPIO & Headers |
on-chip |
SiLabs Gecko GPIO1 |
|
on-chip |
|||
I2C |
on-chip |
Silabs Gecko I2C2 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
MTD |
on-chip |
Flash node1 |
|
on-board |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Pin control |
on-chip |
The Silabs pin controller is a singleton node responsible for controlling pin function selection and pin properties1 |
|
Serial controller |
on-chip |
Gecko USART3 |
|
on-chip |
|||
on-chip |
Gecko LEUART2 |
||
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
Connections and IOs
The EFM32WG SoC has six gpio controllers (PORTA to PORTF), but only three are currently enabled (PORTB, PORTE and PORTF) for the EFM32WG-STK3800 board.
In the following table, the column Name contains Pin names. For example, PE2 means Pin number 2 on PORTE, as used in the board’s datasheets and manuals.
Name |
Function |
Usage |
|---|---|---|
PE2 |
GPIO |
LED0 |
PE3 |
GPIO |
LED1 |
PB9 |
GPIO |
Push Button PB0 |
PB10 |
GPIO |
Push Button PB1 |
PF7 |
GPIO |
Board Controller Enable EFM_BC_EN |
PE0 |
UART0_TX |
UART Console EFM_BC_TX U0_TX #1 |
PE1 |
UART0_RX |
UART Console EFM_BC_RX U0_RX #1 |
System Clock
The EFM32WG SoC is configured to use the 48 MHz external oscillator on the board.
Serial Port
The EFM32WG SoC has three USARTs, two UARTs and two Low Energy UARTs (LEUART). UART0 is connected to the board controller and is used for the console.
Programming and Debugging
Note
Before using the kit the first time, you should update the J-Link firmware in Simplicity Studio.
Flashing
The EFM32WG-STK3800 includes an J-Link serial and debug adaptor built into the board. The adaptor provides:
A USB connection to the host computer, which exposes a Mass Storage and a USB Serial Port.
A Serial Flash device, which implements the USB flash disk file storage.
A physical UART connection which is relayed over interface USB Serial port.
Flashing an application to EFM32-STK3800
The sample application Hello World is used for this example. Build the Zephyr kernel and application:
# From the root of the zephyr repository
west build -b efm32wg_stk3800 samples/hello_world
Connect the EFM32WG-STK3800 to your host computer using the USB port and you should see a USB connection which exposes a Mass Storage (STK3800) and a USB Serial Port. Copy the generated zephyr.bin in the STK3800 drive.
Open a serial terminal (minicom, putty, etc.) with the following settings:
Speed: 115200
Data: 8 bits
Parity: None
Stop bits: 1
Reset the board and you should be able to see on the corresponding Serial Port the following message:
Hello World! efm32wg_stk3800