Lundin‭

posted 3y ago by Lundin‭  ·  edited 1y 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 3y ago by Lundin‭  ·  last activity 3y 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 4y ago by Lundin‭  ·  edited 4y 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 4y ago by Lundin‭  ·  edited 4y 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 4y ago by Lundin‭

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 3y 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 3y ago by Lundin‭  ·  last activity 3y 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 2y ago by Lundin‭

Which are the parameters I should looking for when picking a flyback diode to be placed across a generic coil, such as a relay? That is: a coil with plain on/off functionality, for example a 24VDC ...

2 answers  ·  posted 4y ago by Lundin‭  ·  edited 1y ago by Lorenzo Donati‭

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 4y ago by Lundin‭  ·  edited 4y 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 3y ago by Lundin‭  ·  last activity 2y ago by TonyStewart‭

Disclaimer: I'm not an expert of EX classification myself, but I once was project/product manager for such a project (a zone 0/20 intrinsic control system product). While I can't answer the questio...

posted 3y ago by Lundin‭

My scenario is this: radio equipment controlling an overhead crane inside a steel mill. Specifically it is used for transporting melting pots. With the current, unfortunate installation, the antenn...

2 answers  ·  posted 2y ago by Lundin‭  ·  last activity 1y ago by Lorenzo Donati‭

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

posted 2y ago by Lundin‭  ·  edited 1y ago by Lorenzo Donati‭

Problem description & speculation about causes I've having a problem with MAX485 transceivers breaking intermittently, passing our production tests but later failing. The error phenomenon is w...

2 answers  ·  posted 9mo ago by Lundin‭  ·  last activity 9mo ago by Andy aka‭