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From: Samson <jansencomplex@gmail.com>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Calculate frequencey and pulse width?
Date: Sat, 2 Nov 2024 07:53:23 +0100
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Den 01-11-2024 kl. 22:03 skrev Lawrence D'Oliveiro:
> On Fri, 1 Nov 2024 07:19:07 +0100, Samson wrote:
> 
>> [how] do i  calculate the frquency  and pulse width?
> 
> Let’s see, cycle duration = 1 ÷ frequency, so pulse width must be duty 
> cycle × cycle duration.
> 
> What do I win?

Sorry here are more info. The pico limits PWM 8 Hz and up  pulse width 1 - 100 % .
I have this program and i works  i understand how it works.


my problem was understanding >> dup[delay] ?

=====
# Example using PIO to blink an LED and raise an IRQ at 1Hz.

import time
from machine import Pin
import rp2


@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)
def blink_1hz():
    # Cycles: 1 + 1 + 6 + 32 * (30 + 1) = 1000
    irq(rel(0))
    set(pins, 1)
    set(x, 31)                  [5]
    label("delay_high")
    nop()                       [29]
    jmp(x_dec, "delay_high")

    # Cycles: 1 + 7 + 32 * (30 + 1) = 1000
    set(pins, 0)
    set(x, 31)                  [6]
    label("delay_low")
    nop()                       [29]
    jmp(x_dec, "delay_low")


# Create the StateMachine with the blink_1hz program, outputting on Pin(25).
sm = rp2.StateMachine(0, blink_1hz, freq=2000, set_base=Pin(25))

# Set the IRQ handler to print the millisecond timestamp.
sm.irq(lambda p: print(time.ticks_ms()))

# Start the StateMachine.
sm.active(1)