1. Create a Variable: example "counter"
2. Create a Function:
   1. Name it what you like, example: "count_pulses"
   2. Add single step from Variables: change counter by 1
3. Init PWM0 with your desired pin, freq, and duty
4. Load the attached file under Custom | Open *.m5b file
5. Drag "PIN_IRQ" from Custom onto your workspace
   1. Set the pin number (just an integer, 0 for example)
   2. Set your trigger "machine.Pin.IRQ_RISING"
   3. Set the handler to your function from step 2 above "count_pulses"
6. Add a label if you want and set the loop event to update a label with the current counter value
7. It sounds more complicated than it actually is, check the screenshot

Your resulting code should look vaguely like this:

from m5stack import *
from m5ui import *
from uiflow import *
import machine

setScreenColor(0x222222)

counter = None

label0 = M5TextBox(146, 187, "Text", lcd.FONT_Default, 0xFFFFFF, rotate=0)

from numbers import Number

def count_pulses():
  global counter
  counter = (counter if isinstance(counter, Number) else 0) + 1

PWM0 = machine.PWM(26, freq=25000, duty=50, timer=0)
pin0.irq(trigger=machine.Pin.IRQ_RISING, handler=count_pulses)
while True:
  label0.setText(str(counter))
  wait_ms(2)

Have fun storming the castle!

Thank yo in advance,
Schubi

I tried to implement it, but i get an error.
Would you be so kind to post the whole program?

Thank you in advance,

Schubi

Thanks in advance,

Schubi

First i defined the two variables "is_running" and "counter".
In UIFlow i defined pin0 with GPIO26 as input with pull down resistor.!
Then i defined the event_interrupt(pin) - procedure. I use it for counting impulses at the GPIO26, therefore it is necessary to declare the variables as globals.

Every second i read in the main loop the value of the counter variable and reset the is_running variable.

def event_interrupt(pin):
global is_running, counter
is_running = True
counter += 1

pin0.irq(trigger=machine.Pin.IRQ_RISING, handler=event_interrupt)