multitask-in-micropython's Introduction

workers-framework-micropython

Workers-Framework: A simpler way to MultiTask in MicroPython

The link WF-Book-Sample.pdf will take you to a free sample of the book, which includes the contents, introduction, and appendices.

The book PDF can be purchased at https://leanpub.com/Workers_Framework if you are interested in purchasing the full version.

If you'd prefer to read this book as a flipbook online whenever and wherever you want, go to https://shariltumin.gumroad.com/l/rbkkbn and get one.

Here's a simple example of using REPL keyboard input to control the rate at which the Raspberry Pi Pico's onboard LED blinks.

# blink_rp2040.py
from worker import MT, task
import sys, uselect
from machine import Pin

# poll is better than uselect.select
spoll=uselect.poll()
spoll.register(sys.stdin,uselect.POLLIN)

@task
def kb(pm):
   c=yield
   poll=spoll.poll
   read=sys.stdin.read
   v=c.v
   v.D=500 # 0.5 sec delay at start
   while True:
      if poll(0):
         w=read(1)
         print('w:', w)
         if (w=='+' or w=='f') and v.D<1000: # faster rate
            v.D -= 10
         elif (w=='-' or w=='s') and v.D>10: # slower rate
            v.D += 10
         print('c.v.D:', v.D)
      yield

@task
def blink(pm):
   p=pm[0]
   led = Pin(p, Pin.OUT)
   c=yield
   v=c.v
   while True:
      led.toggle()
      if v.D>0: # if delay is 0 then the program hang
         wait=c.delay(v.D)
         while wait():yield

mt=MT(2)                # we need only 2 workers
mt.worker(kb, ())       # worker for keyboard (in)
mt.worker(blink, (25,)) # worker for LED (out)
mt.start()

Recommend Projects