Blog - Page 34 of 36 - Embedded Artistry

26 December 201614 December 2021

ARM Pointer Alignment Requirements

I stumbled upon this tidbit while reviewing the ARM online documentation on unaligned access. Upon review the information seems obvious, but I was not aware of the specific alignment rules. I am quoting here directly from ARM's website. If you are debugging unaligned access issues, I recommend reading the full article. This is an excerpt …

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23 December 201621 April 2020

Jenkins: Excluding Directories when Cleaning Workspace

For most projects, I recommend that nightly builds start with a completely clean workspace. However, there are certain cases where cleaning is not feasible - repos including large artifacts (e.g. specific toolchains) or numerous git-lfs artifacts. You can destroy bandwidth and increase build time by re-downloading these files for every build. Using jenkins, you can …

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21 December 201616 February 2024

Giving Your Firmware Build a Version

Every software product needs a version number. Once bug reports start rolling in, a version number is an absolute requirement for debugging and addressing issues In this guide, I describe the details I like to store in each build, how I capture these details, and how I make them available to the firmware. Table of Contents: …

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19 December 20169 May 2022

Social Effects of Peer Review

I stumbled across a paper titled “Social Aspects of Code Review“. Peer code reviews are something I am very fond of – I want to have as few bugs as possible in my code. This paper dives into managing the social aspects of code review on your team (i.e. minimizing bruised egos and fear of …

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10 November 20161 December 2023

git: Finding Tags Associated With a Commit

If your source tree is complicated and multiple branches are in use, it can often be difficult to quickly determine which tagged builds contain a specific commit. Did this fix go to the beta branch? Did it make it into 0.9.54, or was it 0.9.55? Here's the git command you need: git tag --contains a5b49f9 …

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4 November 201614 December 2021

Python: Remember to use the right [] () {}

I am not a Python developer, but its ubiquity in our world means that I end up modifying or expanding Python scripts from time to time. Unfortunately, when you're not familiar with a language, it's the small details that get you. Improper bracket/brace/parentheses usage has bitten me more times than I can remember, usually resulting …

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2 November 20161 December 2023

git: Comparing Multiple Branches

Wanting to compare multiple branches in git? Give this a shot: git log --color --graph --topo-order --oneline origin/master origin/branch1 origin/branch2

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28 October 20168 May 2023

git aliases: svn revert

People converting from svn to git often have a hard time finding an analogous process for their svn commands. For something similar to svn revert, you need to do the following: git clean -df git checkout -- . The first command will remove newly created files that have not yet been staged for commit. The second …

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26 October 201614 December 2021

Tip: Getting Your Linux Kernel Source

If you're ever using a Linux environment and need the source for your kernel version, simply use apt-get and run the following: apt-get source linux-image-$(uname -r) This command will download the kernel source into the current directory. The apt-get source command will work to get the source for any binary package when available.

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21 October 201614 December 2021

WFI and JTAG

JTAG and wfi do not place nicely together. You've probably noticed this yourself, wondering why JTAG can't connect or a halt/breakpoint doesn't work. When the ARM core is executing the wait for interrupt operation, the core is placed into a low power mode and the core clock is gated. This wreaks havoc with JTAG, as …

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