Kmdf Hid Minidriver For Touch I2c Device Calibration Best Verified

KMDF HID Minidriver for Touch I2C Device — Calibration Guide

3. Implementation: Retrieving Calibration Data

In a KMDF driver, I2C communication is handled asynchronously via the SPB (Simple Peripheral Bus) target.

4.1 Registering as a HID Minidriver

Your KMDF driver’s DriverEntry must:

  1. Initialize WDF driver.
  2. Call HidRegisterMinidriver with a HID_MINIDRIVER_REGISTRATION structure.
  3. Provide HidRegisterMinidriver with callbacks for:
    • GetDeviceAttributes
    • GetFeatureReport / SetFeatureReport
    • GetInputReport

Calibration often lives in Feature Reports. Define a custom HID Feature Report (e.g., Usage 0x00B0 – Vendor-defined) to get/set calibration parameters from user mode. kmdf hid minidriver for touch i2c device calibration best

5. Example: KMDF Calibration Snippet

typedef struct _CALIBRATION_DATA 
    double A, B, C;  // X = A*Xr + B*Yr + C
    double D, E, F;  // Y = D*Xr + E*Yr + F
    LONG  DisplayWidth;
    LONG  DisplayHeight;
 CALIBRATION_DATA;

LONG ApplyCalibrationX(LONG rawX, LONG rawY, PCALIBRATION_DATA cal) 
double result = cal->A * rawX + cal->B * rawY + cal->C;
result = max(0, min(cal->DisplayWidth - 1, result));
return (LONG)result;
 KMDF HID Minidriver for Touch I2C Device —