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MD200C08D2 Datasheet(PDF) 8 Page - Microchip Technology |
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MD200C08D2 Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 28 page  MM7150 DS00001888B-page 8 2015 - 2016 Microchip Technology Inc. 3.0 MM7150 HID FUNCTIONS The MM7150 responds to the standard HID protocol for sensors when used over I2C, defined in References [1] and [2]. The hierarchy of descriptors used in the HID protocol is as follows: The following sections described the descriptors required for communicating with the MM7150: 3.1 HID Descriptor 3.2 Report Descriptors Report descriptors are composed of pieces of information. Each piece of information is called an Item. The HID class driver contains a parser used to analyze items found in the Report descriptor. The parser extracts infor- mation from the descriptor in a linear fashion. The parser collects the state of each known item as it walks through the descriptor, and stores them in an item state table. The item state table contains the state of individual items. From the parser's point of view, a HID class device looks like the following. TABLE 3-1: HID DESCRIPTOR FORMAT (I2C) Field Description Size Value wHIDDescLength Length of HID Descriptor UINT 16 0x001E bcdVersion Version compliance. Compliant with Version 1.00 UINT 16 0x0100 wReportDescLength Report Descriptor Length (3213 bytes) UINT 16 0x0C8D wReportDescRegister Identifier to read Report Descriptor UINT 16 0x0002 wInputRegister Identifier to read Input Report UINT 16 0x0003 wMaxInputLength Input Report is 13 Bytes + 2 Bytes length field UINT 16 0x000D wOutputRegistert Identifier to read Output Report UINT 16 0x0000 wMaxOutputLength No Output Report UINT 16 0x0000 wCommandRegister Identifier for Command Register UINT 16 0x0005 wDataRegister Identifier for Data Register UINT 16 0x0006 wVendorID Vendor ID UINT 16 0x04D8 wProductID Product ID UINT 16 0x0F01 wVersionID Version UINT 16 0x7150 RESERVED Reserved UINT 32 0x0 |
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