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@defgroup boards_common_slwstk6000b Silicon Labs SLWSTK6000B starter kit @ingroup boards @brief Support for the Silicon Labs SLWSTK6000B starter kit

Overview

Silicon Labs Mighty Gecko Wireless Starter Kit is equipped with the EFM32 microcontroller. It is specifically designed for low-power applications, having energy-saving peripherals, different energy modes and short wake-up times.

The starter kit is equipped with an Advanced Energy Monitor. This allows you to actively measure the power consumption of your hardware and code, in real-time.

Hardware

MCU

The MCU depends on the module used.

Note: not all MCUs are supported by RIOT-OS out of the box.

Implementation Status

Board configuration

Board controller

The starter kit is equipped with a Board Controller. This controller provides a virtual serial port. The boardcontroller is enabled via a GPIO pin.

By default, this pin is enabled. You can disable the board controller module by passing DISABLE_MODULE=silabs_bc to the make command.

Note: to use the virtual serial port, ensure you have the latest board controller firmware installed.

Note: the board controller always configures the virtual serial port at 115200 baud with 8 bits, no parity and one stop bit. This also means that it expects data from the MCU with the same settings.

Advanced Energy Monitor

This development kit has an Advanced Energy Monitor. It can be connected to the Simplicity Studio development software.

This development kit can measure energy consumption and correlate this with the code. It allows you to measure energy consumption on code-level.

The board controller is responsible for measuring energy consumption. For real-time code correlation, the CoreDebug peripheral will be configured to output MCU register data and interrupt data via the SWO port.

By default, this feature is enabled. It can be disabled by passing DISABLE_MODULE=silabs_aem to the make command.

Note that Simplicity Studio requires debug symbols to correlate code. RIOT-OS defaults to GDB debug symbols, but Simplicity Studio requires DWARF-2 debug symbols (-gdwarf-2 for GCC).

Clock selection

There are several clock sources that are available for the different peripherals. You are advised to read AN0004.1 to get familiar with the different clocks.

The sources can be used to clock following branches:

CORELEDIV2 is a source that depends on the clock source that powers the core. It is divided by 2 or 4 to not exceed maximum clock frequencies (EMLIB takes care of this).

The frequencies mentioned in the tables above are specific for this starter kit.

It is important that the clock speeds are known to the code, for proper calculations of speeds and baud rates. If the HFXO or LFXO are different from the speeds above, ensure to pass EFM32_HFXO_FREQ=freq_in_hz and EFM32_LFXO_FREQ=freq_in_hz to your compiler.

You can override the branch's clock source by adding CLOCK_LFA=source to your compiler defines, e.g. CLOCK_LFA=cmuSelect_LFRCO.

Low-power peripherals

The low-power UART is capable of providing an UART peripheral using a low-speed clock. When the LFB clock source is the LFRCO or LFXO, it can still be used in EM2. However, this limits the baud rate to 9600 baud. If a higher baud rate is desired, set the clock source to CORELEDIV2.

Note: peripheral mappings in your board definitions will not be affected by this setting. Ensure you do not refer to any low-power peripherals.

RTC or RTT

RIOT-OS has support for Real-Time Tickers and Real-Time Clocks.

However, this board MCU family has support for a 32-bit Real-Time Clock and Calendar, which can be configured in ticker mode or calendar mode. Therefore, only one of both peripherals can be enabled at the same time.

Configured at 1 Hz interval, the RTCC will overflow each 136 years.

Hardware crypto

This MCU is equipped with a hardware accelerated crypto peripheral that can speed up AES128, AES256, SHA1, SHA256 and several other cryptographic computations.

A peripheral driver interface for RIOT-OS is proposed, but not yet implemented.

Usage of EMLIB

This port makes uses of EMLIB by Silicon Labs to abstract peripheral registers. While some overhead is to be expected, it ensures proper setup of devices, provides chip errata and simplifies development. The exact overhead depends on the application and peripheral usage, but the largest overhead is expected during peripheral setup. A lot of read/write/get/set methods are implemented as inline methods or macros (which have no overhead).

Another advantage of EMLIB are the included assertions. These assertions ensure that peripherals are used properly. To enable this, pass DEBUG_EFM to your compiler.

Pin locations

The EFM32 platform supports peripherals to be mapped to different pins (predefined locations). The definitions in periph_conf.h mostly consist of a location number and the actual pins. The actual pins are required to configure the pins via GPIO driver, while the location is used to map the peripheral to these pins.

In other words, these definitions must match. Refer to the data sheet for more information.

This MCU has extended pin mapping support. Each pin of a peripheral can be connected separately to one of the predefined pins for that peripheral.

Flashing the device

To flash, SEGGER JLink is required.

Flashing is supported by RIOT-OS using the command below:

make flash

To run the GDB debugger, use the command:

make debug

Or, to connect with your own debugger:

make debug-server

Some boards have (limited) support for emulation, which can be started with:

make emulate

Supported Toolchains

For using the Silicon Labs SLWSTK6000B starter kit we strongly recommend the usage of the GNU Tools for ARM Embedded Processors toolchain.

License information

Silicon Labs' EMLIB: zlib-style license (permits distribution of source).