[MyTouchCalib.NT.HW] AddReg=MyTouchCalib.AddReg
To update calibration values on the fly (e.g., during a user-facing calibration wizard), the driver should expose a custom Input/Output Control (IOCTL) code. When a user-space application calculates a new matrix, it sends the data down to the driver using DeviceIoControl . The driver updates its local memory variables and writes the new values back to the registry. 5. Advanced Techniques: Dynamic Baseline Calibration
Uses a "Golden Matrix" defined during factory testing to compensate for known hardware variances. kmdf hid minidriver for touch i2c device calibration
The host operating system intercepts the interrupt and invokes the minidriver's Interrupt Service Routine (ISR).
The system-supplied HID class driver manages upper-level HID communications. It exposes the generic IOCTL interface for user-mode applications and processes incoming HID report packets. 2. KMDF HID Minidriver (The Custom Layer) [MyTouchCalib
The KMDF HID minidriver for touch I2C device calibration provides a set of APIs and callback routines that allow the operating system to interact with the touch device and perform calibration.
This is the "glue" code. It talks to the I2C controller using the SPB (Simple Peripheral Bus) framework and reports data back to the HID Class Driver. The system-supplied HID class driver manages upper-level HID
Do you need help writing the for the matrix coefficients in C?
Calibration typically addresses:
VOID ProcessTouchData( _In_ PDEVICE_CONTEXT Context, _In_ LONG RawX, _In_ LONG RawY, _Out_ LONG* CalibratedX, _Out_ LONG* CalibratedY ) // Apply the 3x3 matrix formula using fixed-point math *CalibratedX = ((Context->Alpha_A * RawX) + (Context->Beta_B * RawY) + Context->Offset_C) / Context->Divisor; *CalibratedY = ((Context->Delta_D * RawX) + (Context->Epsilon_E * RawY) + Context->Offset_F) / Context->Divisor; // Bounds checking against HID Logical Maximums if (*CalibratedX < 0) *CalibratedX = 0; if (*CalibratedY < 0) *CalibratedY = 0; Use code with caution. Best Practices for Testing and Validation
WDF_DRIVER_CONFIG config; WDF_DRIVER_CONFIG_INIT(&config, MyTouchCalibEvtDeviceAdd); return WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);