Raspberry Pi Pico PIO - Ep. 4 - PIO Timing

Join David as he examines the timing functions and features of the RP 2040 PIO that can be used for time critical applications.

00:00 - Introduction
01:05 - Timing Instructions
01:22 - The Set Instruction
01:50 - Frequency
02:34 - Frequency Timing Demonstration
03:48 - NOP
04:50 - Delay
07:18 - Delay time vs. number of Sidesets
08:42 - Jump vs. Wrap
09:33 - Wait
09:57 - Closing

Music:
(Pinnacle 19.5 royalty-free music):
Pulsing Dance
House Fever
Reaction Time
City Night Groove

[AKsevenFOUR]

Well produced and clearly explained. No filler, just well thought out and presented examples that build on each other. A severely under subscribed channel.

[erikfountain]

I love the down to earth and down to business flow of your presentation. I have definitely learned a lot of useful information about the seemingly mysterious Pico PIO. Thanks David!

[preddy]

Seriously underrated channel. You should be having 100x the number of subs as you do.

[miroslavdusek]

For me, the most ussefull article about the PIO programming I have read up to now. Thanks

[calbars]

Best RP2400 PIO Python tutorial I've seen. By far. Keep up the good works!

[samneggs]

Thanks, David for inspiring me to use the PIO to solve my bit-pulse problem. It still took me a whole day to toggle a bit but your videos help immensely.

[bn]

Hi David! Love your channel. Keep up the videos. I loved your speaker rebuild one.

[Marc_Wolfe]

I think I know what MCU I'm buying next. Working towards fuel injection, and the PIOs seem like my most realistic option towards the level of telemetry latency, asynchronous logic flow, and consistency I want. Got a lot of programming shit to learn for all that. Going for F1 AND OEM quality standards as a minimum. Right now I have a 2560 and a generator lol

[yeanic]

Hello David,

I am trying to use the PIO to measure the timing between the two rising edges of two PINs. Which is my best approach?

Thanks,

[mytechnotalent]

Great series! Question at time mark 7:08 you have a nice pulsing LED however I coded it up myself and the pulse is significantly faster and I am not getting that nice slow pulse you are getting. Any thoughts?

from machine import Pin
from rp2 import PIO, StateMachine, asm_pio


# Outputs a signal through 1 GPIO pin

def timex_prog():
set(pins, 1) # output a 1 to the set pin
nop() [30]
set(pins, 0) [31] # output a 0 to the set pin


timex_sm = StateMachine(0, timex_prog, freq=2000, set_base=Pin(16))
timex_sm.active(1)

[jyvben]

so the main program and the pio script can react to the same gpio inbound signal ?
can the main python program keep running after launching the pio script ?
a pio script can wait for a external signal and then execute some steps and stop, so the main python program can have several pio scripts to execute in a certain order ...

[Grazfather]

Small note: Nop isn't a pseudo instruction because it doesn't do anything, it's a pseudo instruction because it's a 'fake' instruction that is aliased to `mov y, y`, which does nothing. You could have pseudo instructions that do do things, this one just happens to not.