Erik de Ruiter asked 3 months ago
The RN Ebooks are very good, thanks to those I can enjoy my hobby because I’m not 20 anymore
but sometimes I need clarification about a line (or many lines) of code!
For example: I stumbled across this line of code:
LV_UNUSED(obj);
Asking ChatGTP (“EXPLAIN LV_UNUSED(obj);”) I got this explanation:
`LV_UNUSED(obj)` is a macro commonly used in the LVGL (Light and Versatile Graphics Library) to avoid compiler warnings about unused variables. In C and C++, when a variable is declared but not used, some compilers will issue a warning. To suppress these warnings, the `LV_UNUSED` macro is used.
Here’s what happens:
1. `LV_UNUSED(obj)` is designed to “use” the variable `obj` in a way that does nothing but satisfies the compiler.
2. It typically expands to something like `(void)(obj);` — this is a no-op (no operation) that casts the variable to `void`, effectively telling the compiler that you are aware of the variable, and its lack of usage is intentional.
This is particularly useful in cases where certain variables may be conditionally unused (e.g., in different configurations, debugging modes, or depending on compiler flags).
### Example:
void my_function(lv_obj_t * obj) {
LV_UNUSED(obj);
// Function implementation without using 'obj'
}
In this example, LV_UNUSED(obj) prevents a warning when the obj parameter isn’t used in the function.
You also can ask ChatGTP to add comments to the code: TYPE: ADD COMMENTS and then paste the code on the next line.
I hope you will benefit of this! 🙂
Rui Santos Staff answered 3 months ago
Thank you for the insight! It definitely helps 🙂
However, sometimes you need to double-check the information as it also frequently provides incorrect info.
Regards,
Rui
mark answered 4 weeks ago
Thanks for this tip. I have been using chapgpt for asking questions and even some code generation (with caution), your suggestions have broadened my potential use cases.
William Lucid answered 4 weeks ago
Good Morning
Have been using Googles Gemini; much like ChatGPT for: help with coding. Advantage of Gemini you can create a share link of a single prompt or the entire chat. Also, Gemini can Gmail or create a Google document.
Here is a share link to an entire chat for a task scheduler: Task Scheduler –entire Gemini chat
Remember the more detailed prompt you type; better the result. Do use as many lines needed for prompt. Additionally you may upload your code for help with debugging. Generated code will likely require your debugging skill. Sometime you can submit genenerated code for Gemini to debug.
Found this reference on setting the time zone: TZ:NTP TZ Reference
Here are some example TZ values, including the appropriate Daylight Saving Time and its dates of applicability for North American Eastern Standard Time (EST) and Eastern Daylight Time (EDT), the normal offset from UTC is 5 hours; since this is west of the prime meridian, the sign is positive. Summer time begins on March’s second Sunday at 2:00am, and ends on November’s first Sunday at 2:00am.
Regards,
William
Bruce Develle answered 3 weeks ago
I’ve been using Microsoft Copilot for similar reasons. I can’t overstate how helpful it is with understanding C++ code that I don’t understand. Just send it a code snippet and ask it to explain the code. Then follow up with more questions until you get a full explanation.
And afterwards, ask Copilot to comment and format the code so you can paste it back into your program if desired. This has been the best, and by far the fastest way to understand 3rd party code. Wouldn’t want to code without it now!
As William states above, the better your question, the better your answer. Be as specific as you can in your question. Don’t leave out any details, or you’ll find yourself having to ask follow-up questions.