6bf350a6e9
Currently with CST816S controllers (but not CST716S controllers) then a swipe delivered whilst the device is asleep will sometimes be processed after we wake it up. That's never likely to be useful. Fix this by explicitly clearing the event buffer as part of the wakeup sequence. Reported-by: Siroj42 <siroj42@users.noreply.github.com> Fixes: #65 Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
102 lines
2.7 KiB
Python
102 lines
2.7 KiB
Python
# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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"""Hynitron CST816S touch contoller driver
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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"""
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import array
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import time
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from machine import Pin
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class CST816S:
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"""Hynitron CST816S I2C touch controller driver.
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.. automethod:: __init__
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"""
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def __init__(self, bus, 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.i2c = bus
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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.dbuf = bytearray(6)
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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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def get_touch_data(self, pin_obj):
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"""Receive a touch event by interrupt.
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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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"""
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dbuf = self.dbuf
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event = self.event
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try:
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self.i2c.readfrom_mem_into(21, 1, dbuf)
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except OSError:
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return None
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event[0] = dbuf[0] # event
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event[1] = ((dbuf[2] & 0xf) << 8) + dbuf[3] # x coord
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event[2] = ((dbuf[4] & 0xf) << 8) + dbuf[5] # y coord
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if self.schedule:
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self.schedule(self)
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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 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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self.event[0] = 0
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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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# Before we can send the sleep command we have to reset the
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# panel to get the I2C hardware running again...
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self._reset()
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try:
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self.i2c.writeto_mem(21, 0xa5, b'\x03')
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except:
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# If we can't power down then let's just put it in reset instead
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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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