I/41Nm1jUxnaL._SL500_AC_SS350_.jpg' alt='Usb Mouse Trackball Hack: Full Version Software With Serial Key' title='Usb Mouse Trackball Hack: Full Version Software With Serial Key' />Tutorial about USB HID Report Descriptors. This page is from my old website, and it is sort of popular, so Ive moved it here. A USB HID report descriptor is one of the descriptors that a USB host can request from a USB device. HID devices send data to the host using reports, and the descriptor tells the host how to interpret the data. I will try to show you how to write one of these descriptors. First, go to this page http www. Device Class Definition for HID. What I will be talking about is essentially paraphrasing the important sections of that document. Thanks for visiting If you appreciate my content, please consider making a donation to a charity on my behalf. Thank you Frank. Second, go get the HID descriptor tool from the same page. Youll want to play with it as you go through this tutorial. It is an absolute headache to write the HID report descriptors manually converting between binary and hex and looking up the meanings of the numbers so this tool is essential. What is a USB HID report descriptor The HID protocol makes implementation of devices very simple. Devices define their data packets and then present a HID descriptor to the host. The HID descriptor is a hard coded array of bytes that describe the devices data packets. This includes how many packets the device supports, how large are the packets, and the purpose of each byte and bit in the packet. For example, a keyboard with a calculator program button can tell the host that the buttons pressedreleased state is stored as the 2nd bit in the 6th byte in data packet number 4 note these locations are only illustrative and are device specific. The device typically stores the HID descriptor in ROM and does not need to intrinsically understand or parse the HID descriptor. Some mouse and keyboard hardware in the market today are implemented using only an 8 bit CPU. Wikipedia on Human Interface Device. Usb Mouse Trackball Hack: Full Version Software' title='Usb Mouse Trackball Hack: Full Version Software' />Im going to try teaching you about USB HID report descriptors by walking you through writing a few. For a simple starting point, let us make a standard mouse. Just three buttons, and movement on the X and Y axis. So we want to send data regarding the buttons and movement. It takes one bit to represent each button, and one byte to represent the movement on one axis as a signed integer. So we can say that we want the data structure to look something like this Bit 7. Bit 6. Bit 5. Bit 4. Bit 3. Bit 2. Bit 1. Bit 0. Byte 0. Useless. Useless. Useless. Useless. Useless. Left Button. Middle Button. Right Button. Byte 1. X Axis Relative Movement as Signed Integer. Byte 2. Y Axis Relative Movement as Signed Integer. And then we can say our data structure in C looks like. So now in our descriptor, our first item must describe buttons, three of them. I/51ztgsldaCL._SX554_.jpg' alt='Usb Mouse Trackball Hack: Full Version Software' title='Usb Mouse Trackball Hack: Full Version Software' />USAGEPAGE Button. USAGEMINIMUM Button 1. USAGEMAXIMUM Button 3. LOGICALMINIMUM 0. LOGICALMAXIMUM 1. REPORTCOUNT 3. REPORTSIZE 1. Thanks for a great fix you created it back in Aug 2006 and it is still applicable today Oct 2008. I purchased a Dellbranded Logitech BT Keyboard and Mouse. YouTuber McMakistein recreated a fully playable version of the Overwatch character Doomfist in Minecraft. INPUT Data,Var,Abs. USAGEPAGE Button. USAGEMINIMUM Button 1. USAGEMAXIMUM Button 3. LOGICALMINIMUM 0. LOGICALMAXIMUM 1. REPORTCOUNT 3. REPORTSIZE 1. INPUT Data,Var,Abs. REPORTCOUNT 1. REPORTSIZE 5. INPUT Cnst,Var,Abs. X axis movement. USAGEPAGE Generic Desktop. Usb Mouse Trackball Hack: Full Version Software With Crack' title='Usb Mouse Trackball Hack: Full Version Software With Crack' />I want to keep things even. LOGICALMINIMUM 1. LOGICALMAXIMUM 1. REPORTSIZE 8. REPORTCOUNT 1. INPUT Data,Var,Rel. X axis movement. USAGEPAGE Generic Desktop. LOGICALMINIMUM 1. LOGICALMAXIMUM 1. REPORTSIZE 8. REPORTCOUNT 1. INPUT Data,Var,Rel. How about Y axis You can try. USAGEPAGE Generic Desktop. LOGICALMINIMUM 1. LOGICALMAXIMUM 1. REPORTSIZE 8. REPORTCOUNT 1. INPUT Data,Var,Rel. USAGEPAGE Generic Desktop. LOGICALMINIMUM 1. LOGICALMAXIMUM 1. Usb Mouse Trackball Hack Full Version Software SiteREPORTSIZE 8. REPORTCOUNT 1. INPUT Data,Var,Rel. Which will work, but to save memory, we can do this instead. USAGEPAGE Generic Desktop. LOGICALMINIMUM 1. LOGICALMAXIMUM 1. REPORTSIZE 8. REPORTCOUNT 2. INPUT Data,Var,Rel. So all your data will end up looking like. USAGEPAGE Button. USAGEMINIMUM Button 1. USAGEMAXIMUM Button 3. LOGICALMINIMUM 0. LOGICALMAXIMUM 1. REPORTCOUNT 3. REPORTSIZE 1. INPUT Data,Var,Abs. REPORTCOUNT 1. REPORTSIZE 5. INPUT Cnst,Var,Abs. USAGEPAGE Generic Desktop. LOGICALMINIMUM 1. LOGICALMAXIMUM 1. REPORTSIZE 8. REPORTCOUNT 2. INPUT Data,Var,Rel. Ah but we are not done, in order to make the computer know that this is a mouse, we do. USAGEPAGE Generic Desktop. COLLECTION Application. USAGE Pointer. COLLECTION Physical. What we wrote already goes here. END COLLECTION. So in the end, this is the USB HID report descriptor for a standard mouse. USAGEPAGE Generic Desktop. USAGE Mouse. 0xa. COLLECTION Application. Folder Lock Terbaru. USAGE Pointer. 0xa. COLLECTION Physical. USAGEPAGE Button. USAGEMINIMUM Button 1. USAGEMAXIMUM Button 3. LOGICALMINIMUM 0. LOGICALMAXIMUM 1. REPORTCOUNT 3. REPORTSIZE 1. INPUT Data,Var,Abs. REPORTCOUNT 1. REPORTSIZE 5. INPUT Cnst,Var,Abs. USAGEPAGE Generic Desktop. USAGE X. 0x. 09, 0x. USAGE Y. 0x. 15, 0x. LOGICALMINIMUM 1. LOGICALMAXIMUM 1. REPORTSIZE 8. 0x. REPORTCOUNT 2. INPUT Data,Var,Rel. ENDCOLLECTION. 0xc. ENDCOLLECTION. This is actually the example descriptor provided with the USB HID documentation, and you can also find this as an example provided with the HID tool. Cool, at this point, you will have encountered some concepts that you may have questions about, you should research the following Usage Pages. Theres one thing that I think isnt explained well in the documentation, USAGE, USAGEPAGE, USAGEMINIMUM and USAGEMAXIMUM. In a descriptor, you first set a USAGEPAGE, and certain USAGEs are available. In the mouse example, USAGEPAGE Generic Desktop allowed you to use USAGE Mouse, and when the usage page was changed to USAGEPAGE Button, then the USAGEMINIMUM and USAGEMAXIMUM allowed you to specify the buttons, and before you can use USAGE X and USAGE Y, the usage page was changed back to USAGEPAGE Generic Desktop. The usage page is like a namespace, changing the usage page affects what usages are available. Read the documentation called HID Usage Tables for more info. Collections. Read the documentation about the official proper use of collections. In my own words, collections can be used to organize your data, for example, a keyboard may have a built in touchpad, then the data for the keyboard should be kept in one application collection while the touchpad data is kept in another. We can assign an Report ID to each collection, which I will show you later. Hey heres something you can do, by turning USAGE Mouse into USAGE Gamepad, you make the computer think that its a game pad with one joystick and 3 buttons. How about converting a Playstation 2 controller into a USB gamepadThe controller has 1. Bit 7. Bit 6. Bit 5. Bit 4. Bit 3. Bit 2. Bit 1. Bit 0. Byte 0. Button. Button. Button. Button. Button. Button. Button. Button. Byte 1. Button. Button. Button. Button. Button. Button. Button. Button. Byte 2. Left X Axis as Signed Integer. Byte 3. Left Y Axis as Signed Integer. Byte 4. Right X Axis as Signed Integer. Byte 5. Right Y Axis as Signed Integer. So our data structure looks like. We make the computer understand that its a game pad. USAGEPAGE Generic Desktop. USAGE Game Pad. COLLECTION Application. COLLECTION Physical. END COLLECTION. for the buttons. USAGEPAGE Button. USAGEMINIMUM Button 1. USAGEMAXIMUM Button 1. LOGICALMINIMUM 0. LOGICALMAXIMUM 1. REPORTCOUNT 1. 6.