kopia lustrzana https://github.com/micropython/micropython
49 wiersze
1.2 KiB
Python
49 wiersze
1.2 KiB
Python
# Example using PIO to wait for a pin change and raise an IRQ.
|
|
#
|
|
# Demonstrates:
|
|
# - PIO wrapping
|
|
# - PIO wait instruction, waiting on an input pin
|
|
# - PIO irq instruction, in blocking mode with relative IRQ number
|
|
# - setting the in_base pin for a StateMachine
|
|
# - setting an irq handler for a StateMachine
|
|
# - instantiating 2x StateMachine's with the same program and different pins
|
|
|
|
# ruff: noqa: F821 - @asm_pio decorator adds names to function scope
|
|
|
|
import time
|
|
from machine import Pin
|
|
import rp2
|
|
|
|
|
|
@rp2.asm_pio()
|
|
def wait_pin_low():
|
|
wrap_target()
|
|
|
|
wait(0, pin, 0)
|
|
irq(block, rel(0))
|
|
wait(1, pin, 0)
|
|
|
|
wrap()
|
|
|
|
|
|
def handler(sm):
|
|
# Print a (wrapping) timestamp, and the state machine object.
|
|
print(time.ticks_ms(), sm)
|
|
|
|
|
|
# Instantiate StateMachine(0) with wait_pin_low program on Pin(16).
|
|
pin16 = Pin(16, Pin.IN, Pin.PULL_UP)
|
|
sm0 = rp2.StateMachine(0, wait_pin_low, in_base=pin16)
|
|
sm0.irq(handler)
|
|
|
|
# Instantiate StateMachine(1) with wait_pin_low program on Pin(17).
|
|
pin17 = Pin(17, Pin.IN, Pin.PULL_UP)
|
|
sm1 = rp2.StateMachine(1, wait_pin_low, in_base=pin17)
|
|
sm1.irq(handler)
|
|
|
|
# Start the StateMachine's running.
|
|
sm0.active(1)
|
|
sm1.active(1)
|
|
|
|
# Now, when Pin(16) or Pin(17) is pulled low a message will be printed to the REPL.
|