why raspberry pi 3 fail to read 1000 p/r rotary encoder while my 8 bit nuvoton micro controller did that properly?

Question

I am using LS s40-6-1000ZT(H) 1000 p/r rotary encoder for my project with raspberry pi 3,but raspberry not working properly as per encoder specification(i.e not counting event properly).What could be the issue? Any solution??

from RPi import GPIO
from time import sleep
import tkinter as tk
a=22
b=23
GPIO.setmode(GPIO.BCM)
GPIO.setup(a,GPIO.IN)
GPIO.setup(b,GPIO.IN)
root=tk.Tk()
clkLastState=GPIO.input(a)
def call():
   global clkLastState
   global counter
   clkState=GPIO.input(a)
   if clkState != clkLastState:
           dtState=GPIO.input(b)
           if dtState != clkState:
              counter +=1
           else:
              counter -=1
           text=str(counter/2)
           print (text[0:-2])
           var.set(text)
   clkLastState=clkState

def my_callback(channel):
   call()

counter=0
clkLastState=GPIO.input(a)
#GPIO.add_event_detect(23,GPIO.BOTH,callback=my_callback)
print (counter)
var=tk.IntVar()
L1=tk.Label(root,bg="orange",fg="red",textvariable=var)
L1.pack()
# var.set(counter)
# root.after(500,main)
root.geometry("100x100")
#GPIO.add_event_detect(22,GPIO.BOTH,callback=my_callback)
GPIO.add_event_detect(23,GPIO.BOTH,callback=my_callback,debouncetime=6)
root.mainloop()
#var=tk.IntVar()
#L1=tk.Label(root,bg="orange",fg="red",textvariable=var)
#L1.pack()  
#GPIO.add_event_detect(23,GPIO.BOTH,callback=my_callback)

GPIO.cleanup()

Answer 1

pigpio has a more deterministic response to GPIO level changes.

Try my pigpio Python example.

It requires the pigpio daemon.

sudo pigpiod

If Python can't keep up you will have to use C instead. Perhaps try this pdif2 C example. It also use the pigpio daemon.