EFM32 Pearl Gecko Starter Kit

Overview

The EFM32 Pearl Gecko Starter Kit EFM32PG-STK3402A contains an MCU from the EFM32PG family built on an ARM® Cortex®-M4F processor with excellent low power capabilities.

EFM32PG-SLSTK3402A

EFM32PG-SLSTK3402A (image courtesy of Silicon Labs)

Hardware

  • Advanced Energy Monitoring provides real-time information about the energy consumption of an application or prototype design.
  • Ultra low power 128x128 pixel Memory-LCD
  • 2 user buttons, 2 LEDs and a touch slider
  • Humidity, temperature, and inductive-capacitive metal sensor
  • On-board Segger J-Link USB debugger

For more information about the EFM32PG SoC and EFM32PG-STK3402A board:

Supported Features

The efm32pg_stk3402a board configuration supports the following hardware features:

Interface Controller Driver/Component
NVIC on-chip nested vector interrupt controller
SYSTICK on-chip systick
FLASH on-chip flash memory
GPIO on-chip gpio
UART on-chip serial port-polling; serial port-interrupt
I2C on-chip i2c port-polling

The default configuration can be found in the defconfig file:

boards/arm/efm32pg_stk3402a/efm32pg_stk3402a_defconfig

Other hardware features are currently not supported by the port.

Connections and IOs

The EFM32PG12 SoC has twelve GPIO controllers (PORTA to PORTL), but only four are currently enabled (PORTA, PORTB, PORTD and PORTF) for the EFM32PG-STK3402A 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
PF4 GPIO LED0
PF5 GPIO LED1
PF6 GPIO Push Button PB0
PF7 GPIO Push Button PB1
PA5 GPIO Board Controller Enable EFM_BC_EN
PA0 UART_TX UART TX Console VCOM_TX US0_TX #0
PA1 UART_RX UART RX Console VCOM_RX US0_RX #0
PD10 UART_TX EXP12_UART_TX LEU0_TX #18
PD11 UART_RX EXP14_UART_RX LEU0_RX #18
PC10 I2C_SDA ENV_I2C_SDA I2C0_SDA #15
PC11 I2C_SCL ENV_I2C_SCL I2C0_SCL #15

System Clock

The EFM32PG SoC is configured to use the 40 MHz external oscillator on the board.

Serial Port

The EFM32PG SoC has four USARTs and one Low Energy UART (LEUART).

Programming and Debugging

Note

Before using the kit the first time, you should update the J-Link firmware from J-Link-Downloads

Flashing

The EFM32PG-STK3402A 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 device 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 EFM32PG-STK3402A

The sample application Hello World is used for this example. Build the Zephyr kernel and application:

# On Linux/macOS
cd $ZEPHYR_BASE/samples/hello_world
mkdir build && cd build

# On Windows
cd %ZEPHYR_BASE%\samples\hello_world
mkdir build & cd build


# Use cmake to configure a Ninja-based build system:
cmake -GNinja -DBOARD=efm32pg_stk3402a ..

# Now run ninja on the generated build system:
ninja

Connect the EFM32PG-STK3402A to your host computer using the USB port and you should see a USB connection which exposes a mass storage device(STK3402A). Copy the generated zephyr.bin to the STK3402A drive.

Use a USB-to-UART converter such as an FT232/CP2102 to connect to the UART on the expansion header.

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’ll see the following message on the corresponding serial port terminal session:

Hello World! arm