circuitpython/tests/pyb/timer_callback.py

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# check callback feature of the timer class
import pyb
from pyb import Timer
# callback function that disables the callback when called
def cb1(t):
print("cb1")
t.callback(None)
# callback function that disables the timer when called
def cb2(t):
print("cb2")
t.deinit()
# callback where cb4 closes over cb3.y
def cb3(x):
y = x
def cb4(t):
print("cb4", y)
t.callback(None)
return cb4
# create a timer with a callback, using callback(None) to stop
tim = Timer(1, freq=1000, callback=cb1)
pyb.delay(10)
# create a timer with a callback, using deinit to stop
tim = Timer(2, freq=1000, callback=cb2)
pyb.delay(10)
# create a timer, then set the freq, then set the callback
tim = Timer(4)
tim.init(freq=2000)
tim.callback(cb1)
pyb.delay(10)
# test callback with a closure
tim.init(freq=3000)
tim.callback(cb3(3))
pyb.delay(10)