Yesterday I learned that j1939 is Canbus, and that our FC6A Plus PLCs support this. Today I learned that when I plug in the PLC to the network the arduino looses control over the HMI, and the PLC doesnt have it. ..so theres some unknown networki...
Im doing my on the Line challenge figured out the issues with the HMI Coms,geting readdy to write the helper functions to make the arduino PLC Server respond with the IO of the arduino.6% memory use on a Mega!well anyway all I have for pots are these...
Ok The Docs arent great, and I literally just figured this out 2 days ago. but if you have a ZLD file (the raw instruction files for IDEC PLC Code)it is now possible to deploy native instructions from the server of your choice.This includes Linu...
Yesterday I wanted to reconfigure all the PLCs in my lab with settings for a specific use case. This involves changing the values of 3 registers to make the PLCs listen to a server over DHCP. my lab has 12 FC6A plcs. and loading windLDR on ...
Sometimes, you want to have a breakpoint that only halts execution (breaks ) if a certain condition is true.
My user story:
I have a GPS design that receives data from satellites. Sometimes, that radio receives "not guaranteed" data. The dat...
Pre C++17
In traditional C++, if you have a class that has a static array as data member, you have to initialise that array outside of the class.
class myclass {
protected:
static uint myarray[4];
};
uint myclass::myarray[4];
You will typi...
Maybe you work with IDEC PLCs, or maybe you have to monitor a process using them. Well, from WindLDR, that process might suck, having to monitor trends, or open multiple instances of WindLDR just to look at some select registers, there is now a ...
Hello All from rural Maine. QAAA.py is a novel drawing app, which uses text to draw pictures. Some of y'all might have been around at a time when ASCII text was more prevalent. Well anyway, this app is designed to be cross platform tho...
In C++ it's common to stream data. You write to a file using the << operator.
example:
cout << "hello, world! << endl;
In this blog I'm making my own minimal output stream class. Just enough code to show that it works. This co...
C++ has a range loop. A for loop that will run over all elements in the range you give it:
std::vector<int> v = {0, 1, 2, 3, 4, 5};
// ...
for (auto i : v)
std::cout << i << ' ';
std::cout << '\n&#...
Context: A Practical Project
Over the past days, I have been developing a Python Qt application to generate weekly meal plans for my baby and family.The project itself is not overly complex, but it has provided a valuable opportunity to reflect on so...
In object oriented designs, there are times when you replace an object by another. Example: when you store an object into an STL container. In a lot of those cases, you create an object, and add it. The object in the container is a cop...
You may read guidelines that say: "never use an object as return value of a function. Because of performance reasons". Because the object is copied into the receiving variable when returning from the function call. That was true in C++...
task: Let's say that you are writing a C++ class, where the objects have to be sorted or compared.
In classic C++, you 'd write an operator overload for <, <=, == , !=, >= and >. In modern C++, you can get all that fun...
If you're interested to try out the latest C++26 options: The Windows port for GCC 15.1 is available for download.I installed GCC 15.1.0 (with POSIX threads) + MinGW-w64 13.0.0 UCRT - release 2. To install, download the zip file, ...
For an embedded design, I made a featherweight class. A C++ construct that used no more data or code size than a traditional C design.
class command {
public:
inline command(uint32_t steps, bool reverse) : cmd_(steps << 1 |...
CMake has an easy way to get access to libraries headers and source: target_link_libraries(your_lib, some_lib). Where your_lib is the library you are developing, and some_lib is a library you depend on. Ideal if you are using a library, and...
*tiny like in: 0 bits of data, 0 code instructions added, 0 clock ticks
scenario: you have a resource that needs to be initialised before use, and deactivated when done. We usually do that by calling some code before the actions, and some code after ...
This blog is based on real world work. I'm controlling a TI DRV8711 stepper motor controller via SPI.
I need to modify 16-bit registers of that IC. TI provided a header file with register definitions, and code to convert that struct to a 16 bit ...
In C++, templates allow you to write generic code, that can handle many types. But almost always, there will be types you can't handle.
In my case, I have a callback manager that supports functions that return a void, a number, a bool or a class...
This is a "classic C++" post, something that's been part of the language since conception: How to use an operator in your class design.
I developed a callback class. Your "gizmo that needs to callback something" would hold an instance of that class (...
When you work on a project, you often rely on external libraries and source code. If you use CMake as your build tool: it can download the artifacts for you. And make them available during build. By using FetchContent.
use case: your pro...
I'm experimenting with new C++ constructs. GCC 15 implements an interesting concept of the C++26 standard: A function can return a status, and either a value or an error message. In a previous post I tested one of C++ standard function...
