Oregon Department of Corrections

Kmdf Hid Minidriver For Touch I2c Device Calibration [exclusive]

VOID EvtIoDeviceControl(WDFQUEUE Queue, WDFREQUEST Request, size_t OutputBufferLength, size_t InputBufferLength, ULONG IoControlCode)

Windows natively provides a generic hidi2c.sys driver to support standard HID-compliant I²C touchscreens that are properly enumerated in ACPI tables. However, custom hardware often requires a custom KMDF minidriver to manage specific power sequencing, firmware loading (like a .fw file for the Silead MSSL1680 controller), or built-in hardware-based calibration logic.

Calibration goals and challenges

Implementing calibration routines in KMDF

What are you currently encountering?

If you need a complete for multi-touch inputs.

To understand where our solution fits, let’s dissect the Windows HID architecture.

Here, KX1, KX2, KX3, KY1, KY2, KY3 are the coefficients of the transformation matrix.

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* Certified check or money order only for purchase by mail; we are sorry, but personal checks are not accepted. VOID EvtIoDeviceControl(WDFQUEUE Queue

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Walk-In Location = cash only

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VOID EvtIoDeviceControl(WDFQUEUE Queue, WDFREQUEST Request, size_t OutputBufferLength, size_t InputBufferLength, ULONG IoControlCode)

Windows natively provides a generic hidi2c.sys driver to support standard HID-compliant I²C touchscreens that are properly enumerated in ACPI tables. However, custom hardware often requires a custom KMDF minidriver to manage specific power sequencing, firmware loading (like a .fw file for the Silead MSSL1680 controller), or built-in hardware-based calibration logic.

Calibration goals and challenges

Implementing calibration routines in KMDF

What are you currently encountering?

If you need a complete for multi-touch inputs.

To understand where our solution fits, let’s dissect the Windows HID architecture.

Here, KX1, KX2, KX3, KY1, KY2, KY3 are the coefficients of the transformation matrix.