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"""Hynitron CST816S touch contoller driver for MicroPython."""
class CST816S:
"""Hynitron CST816S I2C touch controller driver."""
def __init__(self, bus):
self.i2c = bus
self.dbuf = bytearray(6)
def get_event(self, queue):
"""Receive a touch event.
Check for a pending touch event and, if an event is pending,
prepare it ready to go in the event queue.
:return: True if an event is received, False otherwise.
"""
dbuf = self.dbuf
try:
self.i2c.readfrom_mem_into(21, 1, dbuf)
except OSError:
return False
queue[0] = dbuf[0]
queue[1] = ((dbuf[2] & 0xf) << 8) + dbuf[3]
queue[2] = ((dbuf[4] & 0xf) << 8) + dbuf[5]
return True
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