Kmdf Hid Minidriver For Touch I2c Device Calibration
Mastering KMDF HID Minidriver Calibration for I2C Touch Devices
Your KMDF Minidriver: 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. kmdf hid minidriver for touch i2c device calibration
- HID is the native Windows class for human interface devices; using HID means built-in support for input processing, cursor/touch composition, and compatibility with Windows gestures and APIs.
- KMDF (Kernel-Mode Driver Framework) provides a structured, safer model for kernel drivers with event-driven callbacks, queuing, and automatic resource lifetime management.
- For I2C-connected touch controllers, a KMDF HID minidriver sits on top of the SPB (Simple Peripheral Bus) / I2C stack and translates between device registers/transactions and HID reports Windows expects.
- A minidriver lets you implement device-specific initialization, calibration, and power handling while delegating standard HID protocol handling to the framework and HID class driver.
#define IOCTL_TOUCH_CALIBRATE_GET_RAW
CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)
Mastering KMDF HID Minidriver Calibration for I2C Touch
3. Calibration Concepts
3.1 Types of Calibration
| Type | Method | Data Source | |------|--------|--------------| | Static offset | X' = X * a + b | Factory stored in registry | | Bilinear mapping | 2x2 transform matrix | User-guided calibration | | Temperature drift | Linear interpolation | On-die sensor read via I²C | | Noise baseline | Per-node delta | Initial reading after reset | HID is the native Windows class for human