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Touch Firmware d evelopment: talking HID to Windows

HW-182P. Touch Firmware d evelopment: talking HID to Windows. Olumuyiwa Durojaiye Senior Software Engineer Microsoft Corporation. Agenda. Touch digitizer data delivery Driver stack Human Interface Devices (HID) specification USB and I2C You’ll leave with

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Touch Firmware d evelopment: talking HID to Windows

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  1. HW-182P Touch Firmware development: talking HID to Windows Olumuyiwa Durojaiye Senior Software Engineer Microsoft Corporation

  2. Agenda • Touch digitizer data delivery • Driver stack • Human Interface Devices (HID) specification • USB and I2C You’ll leave with • Understanding of touch HW data delivery to Windows • Where to get more information on this topic

  3. The good news? No driver development! • Why? • Independent Hardware Vendors (IHVs ) can focus on firmware development • Reduces production and maintenance costs • How? • Taking advantage of Human Interface Device (HID) Specification • Windows drivers for HID over I2C /USB

  4. Touch input architecture Input component Class Driver Win32k.sys Mini-driver Bus specific lower drivers Digitizer Firmware HIDCLASS.sys HIDCLASS.sys HIDUSB.sys HIDI2C.sys I2C USB Host USB Device Firmware I2C Device

  5. Communicating with the host • New in Win 8 • No more serial (UART) devices • Stricter rules • New certification requirements • Bus • USB or I2C • HID Rules • USB HID Specification: • http://www.usb.org/developers/devclass_docs/HID1_11.pdf • USB HID Usage Table: • http://www.usb.org/developers/devclass_docs/Hut1_11.pdf • Protocol Document: • http://go.microsoft.com/fwlink/p/?LinkId=226808

  6. Device and report descriptors • Required Usages Values: X, Y, Contact id, Contact Count Maximum Button: Tip • Optional Usages Values: Pressure, Width Height, Azimuth Button: In Range • Reporting Modes Parallel Hybrid

  7. Report descriptor Required Usages Optional Usages • 0x05, 0x0d, // USAGE_PAGE (Digitizers) • 0x09, 0x04, // USAGE (Touch Screen) • 0xa1, 0x01, // COLLECTION (Application) • 0x85, 0x01, // REPORT_ID (Touch) • 0x09, 0x22, // USAGE (Finger) • 0xa1, 0x02, // COLLECTION (Logical) • 0x09, 0x42, // USAGE (Tip Switch) • 0x15, 0x00, // LOGICAL_MINIMUM (0) • 0x25, 0x01, // LOGICAL_MAXIMUM (1) • 0x75, 0x01, // REPORT_SIZE (1) • 0x95, 0x01, // REPORT_COUNT (1) • 0x81, 0x02, // INPUT (Data,Var,Abs) • 0x95, 0x07, // REPORT_COUNT (7) • 0x81, 0x03, // INPUT (Cnst,Ary,Abs) • 0x75, 0x08, // REPORT_SIZE (8) • 0x09, 0x51, // USAGE (Contact Identifier) • 0x95, 0x01, // REPORT_COUNT (1) • 0x81, 0x02, // INPUT (Data,Var,Abs) • 0x05, 0x01, // USAGE_PAGE (Generic Desk.. • 0x26, 0xff, 0x0f, // LOGICAL_MAXIMUM (4095) • 0x75, 0x10, // REPORT_SIZE (16) • 0x55, 0x0e, // UNIT_EXPONENT (-2) • 0x65, 0x13, // UNIT(Inch,EngLinear) • 0x09, 0x30, // USAGE (X) • 0x35, 0x00, // PHYSICAL_MINIMUM (0) • 0x46, 0xb5, 0x04, // PHYSICAL_MAXIMUM (1205) • 0x95, 0x02, // REPORT_COUNT (2) • 0x81, 0x02, // INPUT (Data,Var,Abs) • 0x46, 0x8a, 0x03, // PHYSICAL_MAXIMUM (906) • 0x09, 0x31, // USAGE (Y) • 0x81, 0x02, // INPUT (Data,Var,Abs)

  8. Report descriptor • 0x05, 0x0d, // USAGE_PAGE (Digitizers) • 0x09, 0x48, // USAGE (Width) • 0x09, 0x49, // USAGE (Height) • 0x81, 0x02, // INPUT (Data,Var,Abs) • 0x95, 0x01, // REPORT_COUNT (1) • 0x55, 0x0C, // UNIT_EXPONENT (-4) • 0x65, 0x12, // UNIT (Radians,SIROtation) • 0x35, 0x00, // PHYSICAL_MINIMUM (0) • 0x47, 0x6f, 0xf5, 0x00, 0x00, // PHYSICAL_MAXIMUM (62831) • 0x15, 0x00, // LOGICAL_MINIMUM (0) • 0x27, 0x6f, 0xf5, 0x00, 0x00, // LOGICAL_MAXIMUM (62831) • 0x09, 0x3f, // USAGE (Azimuth[Orientation]) • 0x81, 0x02, // INPUT (Data,Var,Abs) • 0xc0, // END_COLLECTION • 0x05, 0x0d, // USAGE_PAGE (Digitizers) • 0x27, 0xff, 0xff, 0xff, 0x0f, // LOGICAL_MAXIMUM (268435455) • 0x75, 0x20, // REPORT_SIZE (32) • 0x95, 0x01, // REPORT_COUNT (1) • 0x09, 0x56, // USAGE (Scan Time) • 0x81, 0x02, // INPUT (Data,Var,Abs) • 0x09, 0x54, // USAGE (Contact count) • 0x25, 0x7f, // LOGICAL_MAXIMUM (127) • 0x95, 0x01, // REPORT_COUNT (1) • 0x75, 0x08, // REPORT_SIZE (8) • 0x81, 0x02, // INPUT (Data,Var,Abs)

  9. Report descriptor • 0x85, REPORTID_MAX_COUNT, // REPORT_ID (Feature) • 0x09, 0x55, // USAGE(Contact Count Maximum) • 0x09, 0x53, // USAGE (Device Identifier) • 0x95, 0x02, // REPORT_COUNT (2) • 0x25, 0x02, // LOGICAL_MAXIMUM (2) • 0xb1, 0x02, // FEATURE (Data,Var,Abs) • 0x85, 0x44, // REPORT_ID (Feature) • 0x06, 0x00, 0xff, // USAGE_PAGE (Vendor Defined) • 0x09, 0xC5, // USAGE (Vendor Usage 0xC5) • 0x15, 0x00, // LOGICAL_MINIMUM (0) • 0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (0xff) • 0x75, 0x08, // REPORT_SIZE (8) • 0x96, 0x00, 0x01, // REPORT_COUNT (0x100 (256)) • 0xb1, 0x02, // FEATURE (Data,Var,Abs) • 0xc0, // END_COLLECTION

  10. Related sessions • [HW-181T] Building great touch systems • [APP-185T] Make great Metro style apps that are touch-optimized using HTML5 • [APP-186T] Build advanced touch apps in Windows 8 

  11. Further reading and documentation • Name of further reading • HID Specification http://www.usb.org/developers/devclass_docs/HID1_11.pdf • HID Usage Table http://www.usb.org/developers/devclass_docs/Hut1_11.pdf • Link to MSDN • The HID Class Driver for Sensors http://go.microsoft.com/fwlink/p/?LinkId=226798 • Windows Pointer Device Data Delivery Protocol  http://go.microsoft.com/fwlink/p/?LinkId=226808 • Windows Hardware DevCenter http://go.microsoft.com/fwlink/p/?LinkId=227308 • Windows DevCenter http://msdn.microsoft.com/windows/

  12. thank you Feedback and questions http://forums.dev.windows.com Session feedbackhttp://bldw.in/SessionFeedback

  13. © 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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