It is already December 1st, and time for a new Advent Calendar. This year the design includes birch plywood with PMMA, SK6812 RGBW LEDs running with a Raspberry Pi Pico board, building a small village.Continue reading
With the war in the Ukraine, energy prices in Europe reached new record levels. This initially affected the gas price which does not affect me directly. But it had a big impact on the price for electrical energy too. In my village, the price for electrical energy is now at 0.45 CHF/kWh, starting October 1st 2022. It is twice as much as what it used to be, and three times more what it used to be the price for the energy at night time.
Saving energy always makes a lot of sense, now even more, both for the environment and directly saving money. Luckily, I started thinking about optimizing the electrical energy used in my house back in 2021, and now in 2022 it really pays off: The daily average of 16 kWh/day (including heating and cooling) came down to 7 kWh/day, or from 4.5 MWh/year down to 2.4 MWh/year, or a reduction of 47%.
There were different areas contributing to this very positive result:
The above graph shows the changes in the different categories, from 2021 (blue, 4.5 MWh) to 2022 (orange, 2.4 MWh).Continue reading
Sometimes it can be a challenge to update or add plugins to older software or Eclipse versions. The ‘CodeWarrior for MCU’ from NXP is legacy and replaced by the newer MCUXpresso IDE and tools, but I continue to use CodeWarrior for our older projects, and it still works fine after all the years and Windows host updates. However, trying to install from the standard eGit Update site fails:Continue reading
In many embedded applications, it is mandatory that memory allocation is static and not dynamic. Means that no calls to things like malloc() or free() shall be used in the application, because they might fail at runtime (out of memory, heap fragmentation).
But when linking with 3rd party libraries or even with the C/C++ standard libraries, how to ensure no dynamic memory is used? The problem can occur as well for C++ objects, or a simple call to printf() which internally requires some dynamic memory allocated.Continue reading
A typical debugging session involves just one ELF/Dwarf binary or executable. But what if I need to program multiple binary files with gdb? Things like loading both the bootloader and the application binary? Or I have a an on-chip file system or data section I need to program?
In this article I show how I can use gdb to load and program extra data, like a binary (.bin) file, both using command line interface and using an IDE.Continue reading
If using C++ on an embedded target, you depend on the constructors for global objects being called by the startup code. While in many cases an embedded system won’t stop, so you don’t need to call the global C++ destructors, this is still something to consider for a proper shutdown.Continue reading
Last week I received the email notification, that NXP has released an update of the MCUXpresso IDE: the version 11.6.1. So I quickly checked it out:Continue reading
In Getting Started: Raspberry Pi Pico RP2040 with Eclipse and J-Link I used a SEGGER J-Link EDU for debugging: unfortunately, probably because of silicon shortage, these EDU probes are out of stock everywhere. Luckily, there is a solution: just use another Raspberry Pi Pico!
This turns a $5 Raspberry Pi Pico board in to a very usable and versatile debug probe.Continue reading
MCU vendors offer SDKs and configuration tools: that’s a good thing, because that way I can get started quickly and get something up and running ideally in a few minutes. But this gets you into a dependency on tools, SDK and configuration tools too: changing later from one MCU to another can be difficult and time consuming. So why not get started with a ‘bare’ project, using general available tools, just with a basic initialization (clocking, startup code, CMSIS), even with the silicon vendor provided IDE and basic support files?
In this case, I show how you easily can do this with CMake, make and Eclipse, without the (direct) need of an SDK.Continue reading