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 2.x

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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=100, callback=cb1)

pyb.delay(5)

print("before cb1")

pyb.delay(15)

# create a timer with a callback, using deinit to stop

tim = Timer(2, freq=100, callback=cb2)

pyb.delay(5)

print("before cb2")

pyb.delay(15)

# create a timer, then set the freq, then set the callback

tim = Timer(4)

tim.init(freq=100)

tim.callback(cb1)

pyb.delay(5)

print("before cb1")

pyb.delay(15)

# test callback with a closure

tim.init(freq=100)

tim.callback(cb3(3))

pyb.delay(5)

print("before cb4")

pyb.delay(15)