Kmdf Hid Minidriver For - Touch I2c Device Calibration

Calibration is the most critical phase in deploying an I2C-connected touch device under Windows. Without precise calibration, Touch I2C devices suffer from coordinate drifting, missed gestures, and misaligned touch targets.

WPP_INIT_TRACING(MyDriver, WPP_CONTROL_GUIDS); TraceEvents(TRACE_LEVEL_VERBOSE, DBG_TOUCH, "Raw X=%d Y=%d", x, y); kmdf hid minidriver for touch i2c device calibration

When an interrupt fires and data is fetched over the I2C bus via an asymmetric I/O request, intercept the raw coordinates before packaging them into a HID report. Calibration is the most critical phase in deploying

Calibration must survive reboots. KMDF offers the registry as a persistent store. and misaligned touch targets. WPP_INIT_TRACING(MyDriver

Your KMDF minidriver must store these coefficients in the registry (or device firmware) and apply them to every touch report.