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Optionally don't invert pressure readings. #23

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merged 2 commits into from
Feb 27, 2023
Merged

Optionally don't invert pressure readings. #23

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3926459
Optionally don't invert pressure readings.
rtwfroody Feb 10, 2023
9b86103
add docstring for inverted pressure
FoamyGuy Feb 27, 2023
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11 changes: 9 additions & 2 deletions adafruit_touchscreen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,8 @@ class Touchscreen:
readings for the X and Y coordinate planes, respectively.
Defaults to :const:`((0, 65535), (0, 65535))`
:param int,int size: The dimensions of the screen as (x, y).
:param bool invert_pressure: Whether to invert the pressure values. Some touchscreens and
drivers may need this to be changed to `False` in order to properly register touches.

"""

Expand All @@ -104,7 +106,8 @@ def __init__(
samples: int = 4,
z_threshold: int = 10000,
calibration: Optional[Tuple[Tuple[int, int], Tuple[int, int]]] = None,
size: Optional[Tuple[int, int]] = None
size: Optional[Tuple[int, int]] = None,
invert_pressure: bool = True
) -> None:

self._xm_pin = x1_pin
Expand All @@ -119,6 +122,7 @@ def __init__(
self._calib = calibration
self._size = size
self._zthresh = z_threshold
self.invert_pressure = invert_pressure

@property
def touch_point(
Expand All @@ -136,7 +140,10 @@ def touch_point(
with AnalogIn(self._yp_pin) as y_p:
z_2 = y_p.value
# print(z_1, z_2)
z = 65535 - (z_2 - z_1)
if self.invert_pressure:
z = 65535 - (z_2 - z_1)
else:
z = z_2 + z_1
if z > self._zthresh:
with DigitalInOut(self._yp_pin) as y_p:
with DigitalInOut(self._ym_pin) as y_m:
Expand Down