Arduino - Generating PWM signal at a given frequency, independent

I need to generate a PWM signal with high frequency and 50% filling on any pin
However, when I do something like that





It's ok until you enter further code and delays needed to implement them ...
When I leave such a delay to the whole, it is so small that various things go crazy, e.g. the display writes so fast that I can't see it with the human eye, whether it is possible to do something in the style of void loop2, which will repeat regardless of the void loop ?
I will add that I have arduino mega 2560

The analogWrite (x) function allows you to set PWM on pins. In Mega it works on pins 2 - 13 and 44 - 46. The argument defines the degree of PWM filling, for 50% it will be 127.

This way you can eliminate the need for loops to get PWM.

https://www.arduino.cc/en/Reference/analogWrite

DarkMajster wrote:

I need to generate a high frequency PWM signal on any pin

Ie. what exactly? As standard, Arduino on PWM outputs generates about 400 Hz.

The first shot that comes to mind is a new variable, added from scratch by one every cycle in the main loop, it can be compared to the number at which the variable resets and changes the state of any pin to the opposite. The higher the number at which the variable (the sum increased by one step) resets and changes the state of the selected pin, the lower the signal frequency.
If there are any additional loops in the main loop, of course, they disrupt the symmetry of filling and frequency, and for this separate processors were invented in the processors
to which you put only settings and data but they count after the program.
Regards.

The easiest way to use the TimerOne library is: https://github.com/PaulStoffregen/TimerOne

lagrange wrote:

The analogWrite (x) function allows you to set PWM on pins. In Mega it works on pins 2 - 13 and 44 - 46. The argument defines the degree of PWM filling, for 50% it will be 127.

This way you can eliminate the need for loops to get PWM.

https://www.arduino.cc/en/Reference/analogWrite

What about frequency?

DarkMajster wrote:

What about frequency?

"The PWM default frequency is 490 Hz for all pins, with the exception of pin 13 and 4, whose frequency is 980 Hz"

The ATMega 2560 microcontroller in Arduino works at 16MHz as far as I remember, but it is worth remembering that every digitalWrite needs a few instructions back and forth. Adding to this the remaining program code, it is unlikely to achieve a better result than on pins 13 and 4.

Although, of course, the answer to the question about the value of the frequency you require is crucial throughout the discussion.

Well, I found the LCD display PHICO D-0 172-H1-0C, connected it, there was a problem with contrast, when I gave him weight for the control pin it, it was the best, the inscription was gently visible, I came to the conclusion that I had to give him voltage negative, so I figured out that I would do the layout as in the diagram

I gave 2 2.2 micro capacitors I typed in arduino what at the beginning of the topic, I gave the code to display in void setup (after entering the loop nothing was displayed due to the very high frequency of the loop) I gave out to the pin from the contrast and it worked as it should.
The problem is of course when I want to use the display for something other than writing good morning on it

Added after 10 [minutes]:

Well, I just connected this circuit under PWM at 50% filling and 1kHz and I was able to get what I wanted, thank you very much for your help