subkey. This ensures that calibration settings survive reboots and driver updates. Coordinate Mapping
Since I2C touch devices often lose calibration on power loss, your KMDF driver must use the system registry for persistence. kmdf hid minidriver for touch i2c device calibration best
The term "calibration" in the keyword points to the most common pain point. Calibration ensures that the coordinates reported by the touchscreen when you press a physical point correspond exactly to the correct position on the display. subkey
Map your raw ADC (Analog-to-Digital Converter) values to the logical range defined in your HID Report Descriptor. Ensure your Logical Maximum and Physical Maximum are perfectly synchronized with the sensor's physical pitch. 3. Handling the I2C "Ghost Touch" Phenomenon kmdf hid minidriver for touch i2c device calibration best