8000 Add ability to sleep until an alarm · Issue #2795 · adafruit/circuitpython · GitHub
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tannewt opened this issue Apr 21, 2020 · 2 comments
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Add ability to sleep until an alarm #2795

tannewt opened this issue Apr 21, 2020 · 2 comments
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circuitpython api enhancement power
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@tannewt
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tannewt commented Apr 21, 2020

#2685 only adds light sleep during time.sleep. We should add a new mechanic for sleeping until an alarm.

An alarm can be anything a microcontroller supports during sleep such as RTC alarm, pin change interrupt and comparator. The alarms should be in separate modules so that the microcontrollers can support different ones.

Then, one sleep_until_alarm() function can take any number of alarms. It will return the object that woke it up.
@tannewt tannewt added this to the Long term milestone Apr 21, 2020
This was referenced Apr 21, 2020
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tannewt commented Sep 17, 2020 •
edited by dhalbert
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Here is an example:

import sleepio
import time
import alarm.pin
import alarm.time

pin0_alarm = alarm.pin.PinLevelAlarm(board.IO0, True, enable_pull=True)
time_alarm = alarm.pin.TimeAlarm(time.monotonic() + 10.0)

while True:
    # start with a light sleep until an alarm triggers.
    alarm = sleepio.sleep_until_alarm(pin0_alarm, time_alarm)
    # do something based on what alarmed
    if alarm == pin0_alarm:
        print("pin change")
    elif alarm == time_alarm:
        print("time out")

[Example updated for newer sleep API, see #2796]

@tannewt tannewt mentioned this issue Oct 18, 2020
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@dhalbert
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Subsumed by #2795. Closing and will copy over the example.

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