MicroPython Forum (Archive)

Posted: **Wed Mar 11, 2020 4:36 pm**

Hello All,

I would like to ask you for help with "Global Function".

What I need:
I need a program to react on impulse (machine.IN) from PWM (also generated by ESP32) to count impulse and when the count reaches a specific amount (like 100, 10, 32000 or different) then break while cycle in "Blink.py".

what I use:
Board: ESP32 (LED on pin 2)
Micropython Firmware:
VS Code:
Version: 1.43.0 (user setup)
Commit: 78a4c91400152c0f27ba4d363eb56d2835f9903a
Date: 2020-03-09T19:47:57.235Z
Electron: 7.1.11
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Windows_NT x64 10.0.18363

I prepared a simplified example of my design:
Designed structure:

My codes:
Boot.py:

Code: Select all

   import machine
   import utime
   LED_PWM = machine.PWM(machine.Pin(2, machine.Pin.OUT))
   LED_PWM.deinit()
   LED_PWM.init()
   utime.sleep(0.1)
   Counter = 0

- meaning is to set PIN to be for generating PWM signal to LED (LED is set on PIN2 on my board)

Main.py

Code: Select all

   def Count(pin):
       global Counter
       Counter = Counter + 1
       return(Counter)

   import machine
   LED_Count = machine.Pin(26, machine.Pin.IN)
   LED_Count.irq(handler=Count, trigger=machine.Pin.IRQ_FALLING)

   import Blink
   Blink.Blink()

- Definition of LED_Count IRQ function (on PIN 26), this IRQ must be with the highest priority because I really need to count every impulse (impulses may be in interval 0 - 1023)
- meaning of this code is to Run external function "Blink" one-time-only (in real project call of "Blink.py" will be multiple times)

Blink.py

Code: Select all

   def Blink():   
       import machine
       import math
       import Wait_Function
       import LED_Start
       import LED_Stop

       Counter = 0
       LED_PWM = machine.PWM(machine.Pin(2, machine.Pin.OUT))
       while True:
           print(str(Counter))
           Wait_Function.Wait_Time()
           if Counter<10:
               LED_Start.LED_Run(5, LED_PWM)
           else:
               LED_Stop.LED_Stop(LED_PWM)
               break

- Meaning of this code is to:
1) Assign Value into Global variable "Counter"
2) Run while cycle till the "Counter" reach 10

LED_Start.py

Code: Select all

   def LED_Run(speed, LED_PWM):
       LED_PWM.deinit()
       LED_PWM.init()
       LED_PWM.freq(speed)
       LED_PWM.duty(512)

- Meaning of this code is to start Blink of LED on defined frequency

LED_Stop.py

Code: Select all

   def LED_Stop(LED_PWM):
       LED_PWM.deinit()

- Meaning of this code is to stop blinking of LED

Wait_Function.py

Code: Select all

   def Wait_Time():
       import utime

       Counter = 0
       while Counter < 5:
           utime.sleep(1)
           Counter = Counter + 1

- While loop is there because I have another code in while loop in real project, to simulate same functoin I use "utime.sleep(1)"

Result of my code:
- While look in "Blink.py" is running forever because "Counter =0" (not updating)
- nevertheless, if I add "print(str(Counter))" into Main.py "function Count" it prints increasing number with every impulse (1, 2, 3, 4, 5, ....)

Don't you know where is problem? what I do badly?

Thank you for any answer I appreciate

Jan Vaško

Posted: **Thu Mar 12, 2020 9:24 am**

I've not trawled through all your code but what does stand out is that Counter in wait_Time is a local variable and is not the same as your global with the same name.

As a general point it's best not to put code in boot.py. Either put it in main.py, or (better) put everything into a user module and simply have main.py import that module. That way you can comment out the import in main.py and debug your module at the REPL.

Posted: **Thu Mar 12, 2020 3:24 pm**

Hello,

I changed the variable in "Wait_Time.py" into "Counter_Inter". But still do not work. I also add "Print(some informaiton here)" into:
1) Count function - that one which is called by IRQ - "print("Loop: "+str(Counter))"
2) while cycle (Blink.py) - "print("While: "+str(Counter))"
3) Wait cycle (Wait_Function.py) - "print("Wait Time 4s")"

Results (prints on REPL):
While: 0
Wait Time 4s
Loop: 1
Loop: 2
Loop: 3
Loop: 4
Loop: 5
Loop: 6
Loop: 7
Loop: 8
Loop: 9
While: 0
Wait Time 4s
Loop: 10
Loop: 11
Loop: 12
Loop: 13
Loop: 14
Loop: 15
Loop: 16
Loop: 17
Loop: 18
Loop: 19
Loop: 20
While: 0
Wait Time 4s
Loop: 21
.....
- this continues till I unplug the device from electricity

Point 2: Why I have code in Boot.py
- not in this example, but in a real project, I have Stepp Motors and DRV8825 and I need as soon as possible to Dispable driver othervise motors starts "jumps".

Thank you

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