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# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import time
def delay(secs: float) -> generator:
end = time.monotonic() + secs
while time.monotonic() < end:
yield None
def fps(fps: float) -> generator:
yield None
dt = 1 / fps
until = time.monotonic() + dt
while True:
remain = until - time.monotonic()
if remain > 0:
time.sleep(remain)
until += dt
if remain < -dt:
# Catch up a bit
until += -remain / 3
yield None
def wait(stop: int) -> generator:
start = time.monotonic()
while True:
elapsed = int((time.monotonic() - start) * 1000)
elapsed = min(stop, elapsed)
yield elapsed
if elapsed >= stop:
break
def test():
for f in delay(2.0):
print(utime.ticks_ms())