Embedded engineering notes from Linumiz — Linux, Zephyr RTOS, U-Boot, Yocto, OTA, secure boot and functional safety.https://blog.linumiz.com/https://blog.linumiz.com/bluez-part-9-understanding-dbus-introspectable-8/https://blog.linumiz.com/bluez-part-9-understanding-dbus-introspectable-8/Introduction: In our journey to deepen our understanding of D-Bus using BlueZ, we've already delved into the org.freedesktop.DBus.Properties interface,…Mon, 26 Aug 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluez-part-7-understanding-dbus-propertieschanged-7/https://blog.linumiz.com/bluez-part-7-understanding-dbus-propertieschanged-7/Introduction: In our previous blog , we delved into DBus methods like Get and GetAll , unraveling the complexities of DBus type systems and how to decode…Sun, 18 Aug 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluez-part-7-understanding-dbus-6/https://blog.linumiz.com/bluez-part-7-understanding-dbus-6/Introduction: In our previous post , we explored the DBUS Set property using the org.freedesktop.DBus.Properties interface to control the power state of a…Mon, 12 Aug 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluez-part-6-understanding-dbus-5/https://blog.linumiz.com/bluez-part-6-understanding-dbus-5/Introduction: In our previous post , we explored the DBUS standard interfaces, focusing on the Properties interface, which provides a structured way to…Sun, 04 Aug 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/time-series-database-tsdb-for-zephyr-rtos/https://blog.linumiz.com/time-series-database-tsdb-for-zephyr-rtos/Introduction: In many of our microcontroller-based projects, efficiently storing and managing configurations and data from various real-world sources is…Wed, 31 Jul 2024 00:00:00 GMTZephyr RTOShttps://blog.linumiz.com/unlocking-the-power-of-yocto-post-and-preprocess-commands/https://blog.linumiz.com/unlocking-the-power-of-yocto-post-and-preprocess-commands/Note: Examples here are only for understanding purpose. Likely we will expand each command with actual/real usage. Yocto provides a set of powerful…Tue, 30 Jul 2024 00:00:00 GMTYoctohttps://blog.linumiz.com/bluez-part-5-understanding-dbus-4/https://blog.linumiz.com/bluez-part-5-understanding-dbus-4/Delving Deeper into D-Bus Standard Interfaces: In our previous blog post , we journeyed through the foundational elements of D-Bus services, exploring the…Sun, 28 Jul 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/excited-for-my-open-source-summit-talk-heres-how-im-preparing/https://blog.linumiz.com/excited-for-my-open-source-summit-talk-heres-how-im-preparing/I’m ecstatic to announce my upcoming talk at the Open Source Summit on " Secure and Encrypted Boot in Zephyr RTOS "! This is a fantastic opportunity to…Wed, 24 Jul 2024 00:00:00 GMTZephyr RTOSSecure BootMCUbootEventshttps://blog.linumiz.com/yocto-image-post-processing-with-image_postprocess_command/https://blog.linumiz.com/yocto-image-post-processing-with-image_postprocess_command/When working with Yocto to create images for embedded systems, post-processing can be a crucial step to ensure that your images are tailored to specific…Tue, 23 Jul 2024 00:00:00 GMTYoctoEmbedded LinuxProvisioningi.MXhttps://blog.linumiz.com/bluez-part-4-understanding-dbus-3/https://blog.linumiz.com/bluez-part-4-understanding-dbus-3/Introduction: In our last post , we delved into the intricacies of D-Bus container types, including Arrays, Dictionaries, and Variants. We provided…Sun, 21 Jul 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/unveiling-innovation-linumiz-at-linux-plumbers-conference-and-open-source-summit-europe-2024/https://blog.linumiz.com/unveiling-innovation-linumiz-at-linux-plumbers-conference-and-open-source-summit-europe-2024/At Linumiz, we specialize in delivering comprehensive software services tailored for U-Boot, Linux, and Zephyr, pivotal technologies in the realm of…Fri, 19 Jul 2024 00:00:00 GMTZephyr RTOSYoctoU-BootOTAEventshttps://blog.linumiz.com/yocto-managing-build-efficiency-with-rm_work_exclude/https://blog.linumiz.com/yocto-managing-build-efficiency-with-rm_work_exclude/In Yocto Project, managing build efficiency is crucial, especially when dealing with large-scale builds that generate substantial temporary files. The…Thu, 18 Jul 2024 00:00:00 GMTYoctoU-Boothttps://blog.linumiz.com/yocto-ease-your-storage-demand-with-rm_work/https://blog.linumiz.com/yocto-ease-your-storage-demand-with-rm_work/Understanding INHERIT =+ "rm_work" : In Yocto Project’s local.conf or in a specific recipe file, INHERIT =+ "rm_work" is a directive that instructs…Wed, 17 Jul 2024 00:00:00 GMTYoctohttps://blog.linumiz.com/yocto-bb_env_passthrough_additions/https://blog.linumiz.com/yocto-bb_env_passthrough_additions/In Yocto Project, BB_ENV_PASSTHROUGH_ADDITIONS is a variable used to specify additional environment variables that should be passed through to the bitbake…Tue, 16 Jul 2024 00:00:00 GMTYoctohttps://blog.linumiz.com/bluez-part-3-understanding-dbus-contd/https://blog.linumiz.com/bluez-part-3-understanding-dbus-contd/Introduction to Container Type System in D-Bus In our previous post , we explored the basic types in D-Bus, laying a strong foundation for understanding…Mon, 15 Jul 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/part-2-understanding-dbus/https://blog.linumiz.com/part-2-understanding-dbus/Introduction: After our revival of BlueZ in our previous blog post, the next crucial step is to simplify the understanding of DBUS specification and its…Mon, 08 Jul 2024 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/part-1-reviving-bluetooth-with-bluez-and-zephyr-rtos/https://blog.linumiz.com/part-1-reviving-bluetooth-with-bluez-and-zephyr-rtos/Introduction: Having been away for over 6 years, I find myself returning to the world of Bluetooth technology, particularly focusing on BlueZ and the…Mon, 24 Jun 2024 00:00:00 GMTZephyr RTOSBluetoothBlueZD-Bushttps://blog.linumiz.com/linumiz-at-embedded-linux-conference-europe-2022/https://blog.linumiz.com/linumiz-at-embedded-linux-conference-europe-2022/Linumiz participated in the OSSummit organized by The Linux Foundation in Dublin, Ireland on Sept 12-16, 2022. Out of 5 talks, 3 talks proposed by Linumiz…Mon, 19 Sep 2022 00:00:00 GMTZephyr RTOSU-BootEventshttps://blog.linumiz.com/software-update-ota-for-zephyr-demo/https://blog.linumiz.com/software-update-ota-for-zephyr-demo/Screen recording demo for https://sched.co/c3St : This video is in effort for the completeness of the demonstration of talk at OSS about " Software Update…Sun, 12 Jul 2020 00:00:00 GMTZephyr RTOSOTAhttps://blog.linumiz.com/linumiz-at-embedded-linux-conference-north-america-2020/https://blog.linumiz.com/linumiz-at-embedded-linux-conference-north-america-2020/Register now and Join in virtual for Software Update (OTA) for Zephyr from Linumiz and more. Book your schedule to talk with us:…Sun, 28 Jun 2020 00:00:00 GMTZephyr RTOSOTAEventshttps://blog.linumiz.com/zephyr-rtos-booting-signed-image-with-custom-keys-for-mcuboot/https://blog.linumiz.com/zephyr-rtos-booting-signed-image-with-custom-keys-for-mcuboot/In previous blog we have used sample key available in MCUboot repository for signing the application image. But it is strictly advised to use custom keys…Sun, 17 Nov 2019 00:00:00 GMTZephyr RTOSSecure BootMCUboothttps://blog.linumiz.com/zephyr-rtos-introduction-to-mcuboot/https://blog.linumiz.com/zephyr-rtos-introduction-to-mcuboot/In the previous blog post, we have build and flashed the sample application for disco_l475_iot1 board using Zephyr RTOS. In this post we are going to…Wed, 06 Nov 2019 00:00:00 GMTZephyr RTOSBluetoothSecure BootMCUboothttps://blog.linumiz.com/zephyr-rtos-getting-started/https://blog.linumiz.com/zephyr-rtos-getting-started/Zephyr, a project of The Linux Foundation backed by major tech companies like Intel, Nordic Semiconductor, NXP, Linaro and much more companies developing…Tue, 05 Nov 2019 00:00:00 GMTZephyr RTOSMCUboothttps://blog.linumiz.com/provisioning-using-serial-download-protocol-sdp-part-2/https://blog.linumiz.com/provisioning-using-serial-download-protocol-sdp-part-2/In our previous post, we have explored basic details about Introduction to Provisioning and it's needs. In this post we will narrow down our use case and…Mon, 04 Nov 2019 00:00:00 GMTU-BootEmbedded LinuxProvisioningi.MXhttps://blog.linumiz.com/provisioning-embedded-linux-part-1/https://blog.linumiz.com/provisioning-embedded-linux-part-1/Development of various Embedded Hardware in market based on various architectures are currently available as various consumer to industrial solutions.…Sun, 27 Oct 2019 00:00:00 GMTU-BootEmbedded LinuxProvisioningi.MXhttps://blog.linumiz.com/yocto-bitbake-recipe-for-uhubctl/https://blog.linumiz.com/yocto-bitbake-recipe-for-uhubctl/uhubctl is utility to control USB power per-port on smart USB hubs. Smart hub is defined as one that implements per-port power switching. This utility can…Tue, 18 Sep 2018 00:00:00 GMTYoctohttps://blog.linumiz.com/bluetooth-connectdevice-without-scanning/https://blog.linumiz.com/bluetooth-connectdevice-without-scanning/After discovering the nearby Bluetooth devices either using StartDiscovery without filter or with SetDiscovertFilter , next big step is to connect with…Fri, 29 Jun 2018 00:00:00 GMTBluetoothBlueZhttps://blog.linumiz.com/beaglebone-uart-peripheral-boot/https://blog.linumiz.com/beaglebone-uart-peripheral-boot/BeagleBone Black serial peripheral boot: BBB supports many peripheral boot options which can be choosen by the SYSBOOT button projected out near p8…Thu, 28 Jun 2018 00:00:00 GMTEmbedded LinuxBeagleBoneUARThttps://blog.linumiz.com/bluetooth-setdiscoveryfilter-for-filtered-scanning/https://blog.linumiz.com/bluetooth-setdiscoveryfilter-for-filtered-scanning/In continuation to our previous blog on bluetooth scanning and remove device after scanning , we will explore on discovery filters. Filters are typically…Tue, 19 Jun 2018 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluetooth-removedevice-to-remove-the-device/https://blog.linumiz.com/bluetooth-removedevice-to-remove-the-device/In our previous example we have seen method to scan for nearby devices . In this blog we will extend the same example to remove the device explicitly.…Wed, 13 Jun 2018 00:00:00 GMTBluetoothBlueZhttps://blog.linumiz.com/bluetooth-adapter-scan-for-new-devices-using-startdiscovery/https://blog.linumiz.com/bluetooth-adapter-scan-for-new-devices-using-startdiscovery/So far we have seen ways to get Adapter properties , set the properties and also to list the devices using GetManagedObjects. To get started with real…Fri, 08 Jun 2018 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluetooth-get-adapter-controller-properties-using-gdbus/https://blog.linumiz.com/bluetooth-get-adapter-controller-properties-using-gdbus/In this blog we extent our previous example list HCI controller using GDBUS method to get the properties of the Adapter. We will examine the Adapter…Wed, 06 Jun 2018 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluetooth-list-devices-using-gdbus/https://blog.linumiz.com/bluetooth-list-devices-using-gdbus/In this blog we will jump back to use GetManagedObjects method to find the list of Bluetooth devices which are currently present in all the Adapters. This…Wed, 06 Jun 2018 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluetooth-set-adapter-powered-property-and-watch-signal-using-gdbus/https://blog.linumiz.com/bluetooth-set-adapter-powered-property-and-watch-signal-using-gdbus/In this blog we will continue our understanding toward BlueZ to set the property in Adapter1 interface in continuation to our Get Property sample. As DBUS…Wed, 06 Jun 2018 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bluetooth-list-available-controllers-using-dbus/https://blog.linumiz.com/bluetooth-list-available-controllers-using-dbus/This blog is the continuation of list controllers using HCI interface, to cover the same use case using DBUS interface provided by Bluez. We will be using…Fri, 01 Jun 2018 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/yocto-bitbake-build-populate-sysroot/https://blog.linumiz.com/yocto-bitbake-build-populate-sysroot/Yocto stops building the global sysroot (both native and cross) from version 2.6. To build any package yocto copies the sysroot as "recipes-sysroot" and…Mon, 28 May 2018 00:00:00 GMTYoctohttps://blog.linumiz.com/bluetooth-list-available-controllers/https://blog.linumiz.com/bluetooth-list-available-controllers/This is the fist post in the series of blogs for Bluetooth in Linux. In this series we are going to cover mostly about Bluez and it's provisions for…Sat, 26 May 2018 00:00:00 GMTBluetoothBlueZD-Bushttps://blog.linumiz.com/bash-tricks-listing-only-the-directories-using-ls-command/https://blog.linumiz.com/bash-tricks-listing-only-the-directories-using-ls-command/It took some time and effort to list the directories alone using ‘ ls ‘ command. The below option helps in showing that. ls -d */ Here is the working…Sun, 22 Apr 2018 00:00:00 GMTBashhttps://blog.linumiz.com/accessing-uart-in-msp430f5418/https://blog.linumiz.com/accessing-uart-in-msp430f5418/UART is the traditional serial communication protocol used. It offers only two pins RX and TX for sending and receiving characters serially. A…Sun, 22 Apr 2018 00:00:00 GMTEmbedded LinuxMSP430UARThttps://blog.linumiz.com/linux-kernel-source-browsing-using-cscope/https://blog.linumiz.com/linux-kernel-source-browsing-using-cscope/Source code browsing in large projects is always tedious job to narrow down. In repositories like Linux Kernel, where the source code grows everyday needs…Sun, 22 Apr 2018 00:00:00 GMTLinux KernelEmbedded Linuxhttps://blog.linumiz.com/bash-tricks-editing-wrongly-typed-command/https://blog.linumiz.com/bash-tricks-editing-wrongly-typed-command/We often used to type a lengthy command and realize the error after running the command. To correct this error, either we used to re-type the whole…Wed, 11 Apr 2018 00:00:00 GMTBashhttps://blog.linumiz.com/bash-tricks-re-run-a-range-of-history-commands/https://blog.linumiz.com/bash-tricks-re-run-a-range-of-history-commands/Sometime we may want to run a range of commands which was run in the past (captured in ' history ' command). This can be achieved using 'fc' command. Run…Wed, 11 Apr 2018 00:00:00 GMTBashhttps://blog.linumiz.com/bash-tricks-sudo-to-last-run-command/https://blog.linumiz.com/bash-tricks-sudo-to-last-run-command/To re-run the previous command, we can use the below special way in bash. !! #This re-runs the previous command But the question is, why should i run '!!'…Wed, 11 Apr 2018 00:00:00 GMTBash