Lundin‭

posted 9mo ago by Lundin‭  ·  edited 3mo ago by Lundin‭

This question here about the OSI model was closed as off-topic. How should we treat questions about data communication? What is definitely on-topic here: Embedded systems programming, including...

3 answers  ·  posted 12mo ago by Lundin‭  ·  last activity 12mo ago by Olin Lathrop‭

One rule of thumb is that a CAN network should never have any error frames when it is up and running. It is expected to have some when all nodes are "waking up", or if you hot plug something to the...

posted 2y ago by Lundin‭  ·  edited 2y ago by Lundin‭

When writing firmware in C for a microcontroller, how can I directly access a memory location such as a hardware peripheral register, given its absolute address? Is there a way to do this safely an...

1 answer  ·  posted 2y ago by Lundin‭  ·  edited 2y ago by Lundin‭

Using pointer types In C, an object pointer such as uint8_t* ptr is the equivalent concept to use for hardware addresses. A compiler makes this pointer type large enough to contain all addresses in...

posted 2y ago by Lundin‭

As we know there exists numerous different kinds of PCB CAD software. The big ones seem to be Eagle, KiCAD, Altium, OrCAD, Solidworks, DesignSpark and probably a few more. When it comes to mechani...

1 answer  ·  posted 11mo ago by Lundin‭  ·  last activity 11mo ago by Olin Lathrop‭

Based on this nerdy but seemingly trustworthy site: https://www.prc68.com/I/TelephonePoles.shtml Then I would guess these are cable TV repeaters/signal amplifiers. Classic cable TV uses copper co...

posted 6mo ago by Lundin‭

Regarding scope of embedded systems/firmware When we released Software Development, I made a push to make all forms of embedded systems programming off-topic and re-direct such to this site. The ...

posted 2y ago by Lundin‭  ·  edited 2y ago by Lundin‭

Assume I'm a complete beginner at RF. Is there a way to measure return loss of an antenna, in such a manner that I can reliably reproduce the measurement later on? What I'm talking about is produ...

2 answers  ·  posted 1y ago by Lundin‭  ·  last activity 4mo ago by TonyStewart‭

RF novice here. If using a superheterodyne receiver for the purpose of FM/FSK modulated signals, I'm wondering if the location of an optional automatic gain control (AGC) circuit is always placed o...

0 answers  ·  posted 11mo ago by Lundin‭

Things happening/things we want to happen before main() is called: The code executed before main() is called is often referred to as "the C runtime (CRT)" or just "start-up code". This code is typ...

posted 21d ago by Lundin‭

Hi there! The on-topic page https://electrical.codidact.com/help/topics might need a bit of tweaking and discussion. I think it is important that such a page attempts to be as specific as possible ...

posted 2y ago by Lundin‭

To expand on Olin's answer about power dissipation, one theory is EX/ATEX qualification for explosive environments. This is likely needed for these kind of cars, given the massive energy in those b...

posted 1y ago by Lundin‭

When using through-hole ("THR") connectors on a multi-layer PCB, I frequently notice problems with the ground pins, when these are connected to the ground plane(s) through various "thermal relief" ...

1 answer  ·  posted 1y ago by Lundin‭  ·  edited 1y ago by Nick Alexeev‭

Whenever declaring a variable in C outside a function at file scope or when specifying it as static, it gets assigned a life time known as static storage duration. Meaning it will be accessible thr...

1 answer  ·  posted 21d ago by Lundin‭  ·  last activity 21d ago by Lundin‭