nRF5 SDK Segger Embedded Studio Memfault Example

This is an example project for Segger Embedded Studio and the nRF5 SDK, targeting the nRF52480-DK ("pca10056") dev board.

Building

Prerequisites

Make sure the SDK_ROOT macro is set up in Segger Embedded Studio:

• https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.meshsdk.v3.1.0/md_doc_getting_started_how_to_build.html#how_to_build_segger_setup

Setup Steps

1. Download and unpack the nRF5 SDK. This example was tested with v15.2.0, which can be downloaded here.

2. In the nRF5 SDK, disable the nRF5 SDK app_error.h file by renaming it:

   mv components/libraries/util/app_error.h{,.overriden}

3. Clone this repo somewhere:

   git clone --recursive \
      https://github.com/memfault/nrf5-segger-embedded-studio-example.git

4. Open segger embedded studio and open the solution from <path_to_this_repo>/pca10056/blank/ses/cli_pca10056.emProject

5. Build and flash to the nRF52480-DK

6. Use the built-in RTT terminal to execute the Memfault Demo CLI commands

Details on Memfault integration

The overall strategy to integrating Memfault to a Segger Embedded Studio project is as follows:

1. Add the memfault source files

1. Add the memfault sdk as a git submodule (only if the project is already using git, otherwise just clone the Memfault SDK instead):

   ❯ git submodule add https://github.com/memfault/memfault-firmware-sdk.git third_party/memfault-firmware-sdk

2. Add the source files; for example, as a virtual folder with the following exclusions (example below is the content in the .emProject file itself; can be added from within Segger Embedded Studio or by manually editing the file in a text editor):

   <folder
   Name="third_party/memfault-firmware-sdk"
   exclude="cmake;components/http;examples;scripts;tests;atmel;cypress;dialog;emlib;esp8266_sdk;esp_idf;freertos;lwip;mbedtls;mynewt;nxp;particle;qp;s32sdk;stm32cube;templates;zephyr;nrf5_coredump_storage.c"
   filter="*.c"
   path="../../../third_party/memfault-firmware-sdk"
   recurse="Yes" />

3. Add the necessary search paths to the Preprocessor configuration

../../../third_party/memfault-firmware-sdk/examples/nrf5/apps/memfault_demo_app/third_party/memfault/sdk_overrides
../../../third_party/memfault-firmware-sdk/components/include
../../../memfault_port
../../../third_party/memfault-firmware-sdk/ports/include

4. Modify the linker XML

This is usually the flash_placement.xml file. It needs to include the following section for the Build ID:

<ProgramSection alignment="4" load="Yes" name=".text" />
<!-- placing it right after the .text section -->
 <ProgramSection alignment="4" keep="Yes" load="Yes" name=".note.gnu.build-id" inputsections="*(.note.gnu.build-id)" address_symbol="__start_gnu_build_id_start" end_symbol="__stop_gnu_build_id_stop" />

5. Add the linker option for build id

Under project Options -> Code -> Linker -> Additional Linker Options, add --build-id on its own line. Example here for the .emProject file:

<solution Name="MyProject" target="8" version="2">
  <project Name="MyProject">
    <configuration
      ...
      linker_additional_options="--build-id"

6. Add the necessary memfault port files

In this example, they're added in thememfault_port folder as a virtual folder, which can be added through the UI, or by directly modifying the .emProject XML:

<folder
   Name="memfault_port"
   exclude=""
   filter="*.c"
   path="../../../memfault_port"
   recurse="Yes" />

Note that the memfault_port/memfault_platform_log_config.h and memfault_port/memfault_platform_config.h files contained required settings for successfully building the project, be sure to copy them as-in into the target project (or review the settings and make sure the necessary ones are included).