Eliminate race condition to improve coordinate accuracy and reliability. #18
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Significantly improves touch coordinate accuracy and reliability.
FoamyGuy
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Dec 30, 2021
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Looks good to me. Tested on PyPortal with Display_Button and simpletest from this library. Thanks for the improvement @CedarGroveStudios
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@FoamyGuy Here's a calibration helper for built-in displays that works graphically or REPL-only. It provides a calibration tuple compatible with the screen rotation parameter. Next version will accommodate add-on displays. |
adafruit-adabot
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Dec 31, 2021
Updating https://github.com/adafruit/Adafruit_CircuitPython_ESP32SPI to 3.5.14 from 3.5.13: > Merge pull request adafruit/Adafruit_CircuitPython_ESP32SPI#148 from tekktrik/doc/status-led-connect Updating https://github.com/adafruit/Adafruit_CircuitPython_Touchscreen to 1.1.8 from 1.1.7: > Merge pull request adafruit/Adafruit_CircuitPython_Touchscreen#18 from CedarGroveStudios/main > update rtd py version Updating https://github.com/adafruit/Adafruit_CircuitPython_BLE_Adafruit to 1.3.2 from 1.3.1: > Merge pull request adafruit/Adafruit_CircuitPython_BLE_Adafruit#15 from dhalbert/ulab-numpy > update rtd py version
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Was experiencing occasional touch coordinate errors, particularly when rapidly pressing the touchscreen. The existing code measured the x and y coordinates then would check to see if the z (pressed) value exceeded the touch threshold value. In some cases, the x and/or y coordinate value would reflect a measurement made before or while the screen was being pressed, resulting in a significant coordinate offset error even when averaged.
The modification changes the logic; the x and y values are not measured until after the z value exceeds the threshold, assuring coordinate accuracy and stability.
Tests without the changes experienced approximately 2 errors per 50 presses. The error rate dropped to 0 with the updated code. Tests were performed using CircuitPython 7.0.0 on a PyPortal Titano using DisplayIO Buttons and VectorIO objects.