If you need a complete for multi-touch inputs.
*(USHORT*)(report + 1) = calX; *(USHORT*)(report + 3) = calY;
controller and the Windows HID class driver ( mshidkmdf.sys ).
Hardcoding calibration values is a recipe for failure, as every screen panel has slight manufacturing variances. Instead, use the Windows Registry to store device-specific offsets. kmdf hid minidriver for touch i2c device calibration
When a touch screen is inaccurate, lines wave, or touches register in the wrong place, it requires calibration. This article explains how to build, configure, and calibrate a KMDF HID minidriver for an I2C touch device. 1. The Architecture of Windows Touch Inputs
The driver acts as a pipeline. It receives calibration coordinates from a user-space utility tool and forwards them directly to the touch controller chip via specialized I2C write sequences. The chip stores these values in its internal non-volatile memory (EEPROM/Flash).
case IOCTL_SET_CALIBRATION_DATA: // Validate input buffer // Parse calibration parameters (scaling factors, offsets) // Store in device context or write to hardware // Mark calibration as valid break; If you need a complete for multi-touch inputs
: Run the Digitizer Touch Test validations in the HLK suite. This program checks linear alignment, jitter thresholds, point separation matrices, and touch-down latency to guarantee the OS recognizes the hardware as a valid multi-touch device. Debugging with WinDbg
By handling coordinate conversions transparently inside the driver, any standard user-space application can interact with your touch panel flawlessly. To help you refine this guide, please let me know:
Are you planning to perform calibration writes or handle coordinate calculations purely in software ? Instead, use the Windows Registry to store device-specific
NTSTATUS MyTouchCalibEvtDeviceAdd(WDFDEVICE Device)
WdfRequestComplete(Request, Params->IoStatus.Status);
