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update read speeds when using the properties - fix #2 #18

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update read speeds when using the properties - fix #2 #18

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12 changes: 9 additions & 3 deletions adafruit_nunchuk.py
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@
_DEFAULT_ADDRESS = 0x52
_I2C_INIT_DELAY = 0.1
_I2C_READ_DELAY = 0.01
_I2C_BUFFER_UPDATE_DELAY = 0.03


class Nunchuk:
Expand All @@ -67,6 +68,9 @@ def __init__(self, i2c, address=_DEFAULT_ADDRESS):
time.sleep(_I2C_INIT_DELAY)
i2c_dev.write(b"\xFB\x00")

# set to 0 to force read for intial
self.last_updated = 0

@property
def joystick(self):
"""Return tuple of current joystick position."""
Expand Down Expand Up @@ -96,13 +100,15 @@ def acceleration(self):
return x, y, z

def _read_data(self):
return self._read_register(b"\x00")
if (time.monotonic() - self.last_updated) > _I2C_BUFFER_UPDATE_DELAY:
self.last_updated = time.monotonic()
self._read_register(b"\x00")

return self.buffer

def _read_register(self, address):
with self.i2c_device as i2c:
time.sleep(_I2C_READ_DELAY)
i2c.write(address)
time.sleep(_I2C_READ_DELAY)
i2c.readinto(self.buffer)
time.sleep(_I2C_READ_DELAY)
return self.buffer