In the modern ecosystem of embedded systems and mobile computing, the I2C (Inter-Integrated Circuit) bus has become the de facto standard for connecting low-speed peripherals like touch controllers, sensors, and haptic drivers. Among these, touch devices—ranging from simple trackpads to high-resolution multi-touch screens—present a unique challenge: maintaining accuracy over temperature, aging, and manufacturing tolerances. This is where calibration becomes critical.
WDF_INTERRUPT_CONFIG interruptConfig;
WDF_INTERRUPT_CONFIG_INIT(&interruptConfig, TouchCalibEvtInterruptIsr, TouchCalibEvtInterruptDpc);
interruptConfig.PassiveHandling = TRUE; // Allows I2C calls
WdfInterruptCreate(Device, &interruptConfig, WDF_NO_OBJECT_ATTRIBUTES, &Interrupt);
Depending on how the touch panel is mounted (0°, 90°, 180°, 270°), you may need to: Swap X and Y. Invert an axis: Final_X = Logical_Max_X - Calculated_X. 4. Handling Interrupts and Data Retrieval kmdf hid minidriver for touch i2c device calibration
Apply Transformation: Use a linear transformation matrix to adjust for rotation, inversion, or scaling issues. Inversion Example: If the -axis is flipped, Mastering Precision: Building a KMDF HID Minidriver for