micropython pwm start conditions

[vtt]

I have this program that works too

Code: Select all

from machine import Pin
from machine import PWM
from time import sleep


# Set our pin 25 to PWM
pwm1 = PWM(Pin(25), freq=300, duty=0)
pwm2 = PWM(Pin(27), freq=300, duty=0)

while True:
    # Brightness between 0 and 1023
    for brightness in range (0, 1023, 5): #range(start, stop, step)
      pwm1.duty(brightness)
      pwm2.duty(brightness)
      print(brightness)
      sleep(0.1)
    sleep(1)
    # Brightness between 1023 and 0
    for brightness in range (1023, 0, -5): #range(start, stop, step)
      pwm1.duty(brightness)
      pwm2.duty(brightness)
      print(brightness)
      sleep(0.1)
    sleep(1)

When I start the program, the LEDs on pin 25 and 26 flicker briefly before the program runs.

How can I fix this startup error?