f221e2f8a4
So... waking up once per second turns out to be a dumb idea because it
regresses the stop watch and HRS tools (which now also only wake up once
per second).
Undo this change but sprinkle a few more micropython.native decorations
on methods used on the wakeup path to minimise power.
Fixes: fb18705b9b ("manager/rtc: Experimental power saving technique")
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
87 lines
2.1 KiB
Python
87 lines
2.1 KiB
Python
# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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"""Basic touch sensor driver
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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"""
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import array
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import micropython
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import time
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from machine import Pin
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from watch import rtc
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class TouchButton:
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"""Simple touch controller driver.
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.. automethod:: __init__
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"""
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def __init__(self, intr, rst, schedule=None):
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"""Specify the bus used by the touch controller.
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:param machine.I2C bus: I2C bus for the CST816S.
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"""
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self.tp_int = intr
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self.tp_rst = rst
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self.schedule = schedule
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self.event = array.array('H', (0, 0, 0))
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self._reset()
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self.tp_int.irq(trigger=Pin.IRQ_FALLING, handler=self.get_touch_data)
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def _reset(self):
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self.tp_rst.off()
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time.sleep_ms(5)
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self.tp_rst.on()
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time.sleep_ms(50)
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self.event[0] = 0
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self._wake_at = rtc.get_uptime_ms() + 300
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def get_touch_data(self, pin_obj):
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"""Synthesize a right swipe during interrupt.
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"""
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self.event[0] = 253 # NEXT
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if self.schedule:
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self.schedule(self)
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@micropython.native
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def get_event(self):
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"""Receive a touch event.
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Check for a pending touch event and, if an event is pending,
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prepare it ready to go in the event queue.
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:return: An event record if an event is received, None otherwise.
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"""
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if rtc.get_uptime_ms() < self._wake_at:
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self.event[0] = 0
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if self.event[0] == 0:
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return None
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return self.event
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def reset_touch_data(self):
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"""Reset touch data.
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Reset touch data, call this function after processing an event.
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"""
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self.event[0] = 0
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def wake(self):
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"""Wake up touch controller chip.
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Just reset the chip in order to wake it up
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"""
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self._reset()
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def sleep(self):
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"""Put touch controller chip on sleep mode to save power.
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"""
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self.tp_rst.off()
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# Ensure get_event() cannot return anything
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self.event[0] = 0
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