g0tmilk Posted July 7, 2022 Share Posted July 7, 2022 im building a mouse and keyboard usb from a rasperry pi. i have a working example with the mouse. but im confused about the x and y location documentation shows that both x and y consist of 2 values. a negative and positive x= -127 and 127 y= -127 and 127 so is there math involved? what is it? i can get the mouse to move by writing to the /dev/hidg0 echo -ne "\x00\x00\x40\x00\x40\x00\x00\x00" > /dev/hidg0 hex40=64 this command will locate the mouse to the center of my screen. but i cant get it to move one pixel at a time. im using ruby to automate this but i dont understand the coordinate system. since x and y require the use of a negative and a positive. Quote Link to comment Share on other sites More sharing options...
dark_pyrro Posted July 7, 2022 Share Posted July 7, 2022 What documentation are you using when developing this? Any official/public reference? Quote Link to comment Share on other sites More sharing options...
g0tmilk Posted July 15, 2022 Author Share Posted July 15, 2022 On 7/7/2022 at 7:34 AM, dark_pyrro said: What documentation are you using when developing this? Any official/public reference? Here is a article that will get a working example. https://forums.raspberrypi.com/viewtopic.php?t=234495 #!/bin/bash # mouse cd /sys/kernel/config/usb_gadget/ mkdir -p isticktoit cd isticktoit echo 0x1d6b > idVendor # Linux Foundation echo 0x0104 > idProduct # Multifunction Composite Gadget echo 0x0100 > bcdDevice # v1.0.0 echo 0x0200 > bcdUSB # USB2 mkdir -p strings/0x409 echo "fedcba9876543210" > strings/0x409/serialnumber echo "Tobias Girstmair" > strings/0x409/manufacturer echo "iSticktoit.net USB Device" > strings/0x409/product mkdir -p configs/c.1/strings/0x409 echo "Config 1: ECM network" > configs/c.1/strings/0x409/configuration echo 250 > configs/c.1/MaxPower # Add functions here mkdir -p functions/hid.usb0 echo 1 > functions/hid.usb0/protocol echo 1 > functions/hid.usb0/subclass echo 3 > functions/hid.usb0/report_length echo -ne \\x05\\x01\\x09\\x02\\xa1\\x01\\x09\\x01\\xa1\\x00\\x05\\x09\\x19\\x01\\x29\\x03\\x15\\x00\\x25\\x01\\x95\\x03\\x75\\x01\\x81\\x02\\x95\\x01\\x75\\x05\\x81\\x03\\x05\\x01\\x09\\x30\\x09\\x31\\x15\\x81\\x25\\x7f\\x75\\x08\\x95\\x02\\x81\\x06\\xc0\\xc0 > functions/hid.usb0/report_desc ln -s functions/hid.usb0 configs/c.1/ ls /sys/class/udc > UDC Chmod +x this bash script to enable the otg on the pi and your windows pc will see the pi as a new mouse. Then a quick test will move your mouse. On the pi run Echo -ne "\x00\x09\x09" > /dev/hidg0 Moves the mouse 9 pixles up and right. But with this config i found that if you run the command multiple times its inacurate. And wont work for me. Ill explain more on my lunch break Quote Link to comment Share on other sites More sharing options...
dark_pyrro Posted July 15, 2022 Share Posted July 15, 2022 I can't see where in the referenced "documentation" that the previously mentioned positive (127) and negative (-127, or -128) fit in. That type of "range" is used in other specifications for mouse control though. It should be used as a positioning reference based on the current position of the pointer, not aligned to any form of fixed grid. Arduino HID class/libraries use that form when "addressing" the position. Negative numbers moving the cursor down/left, positive numbers move the cursor right/up. Quote Link to comment Share on other sites More sharing options...
g0tmilk Posted July 15, 2022 Author Share Posted July 15, 2022 3 hours ago, dark_pyrro said: I can't see where in the referenced "documentation" that the previously mentioned positive (127) and negative (-127, or -128) fit in. That type of "range" is used in other specifications for mouse control though. It should be used as a positioning reference based on the current position of the pointer, not aligned to any form of fixed grid. Arduino HID class/libraries use that form when "addressing" the position. Negative numbers moving the cursor down/left, positive numbers move the cursor right/up. Here is the git i used for the first post. https://github.com/jonatanklosko/gerbil And below is the configure source file with bit codes to enable hidg0 that has me confused on the 8 bytes that include (-x , +x, -y, +y) https://github.com/jonatanklosko/gerbil/blob/main/bin/enable_mouse_hid_gadget.sh This is the config report \x05\x01\x09\x02\xa1\x01\x09\x01\xa1\x00\x05\x09\x19\x01\x29\x03\x15\x00\x25\x01\x95\x03\x75\x01\x81\x02\x95\x01\x75\x05\x81\x03\x05\x01\x09\x30\x09\x31\x15\x00\x26\xff\x7f\x75\x10\x95\x02\x81\x02\xc0\xc0 # Write the report descriptor # # 0x05, 0x01, // Usage Page (Generic Desktop) # 0x09, 0x02, // Usage (Mouse) # 0xa1, 0x01, // Collection (Application) # 0x09, 0x01, // Usage (Pointer) # 0xa1, 0x00, // Collection (Physical) # 0x05, 0x09, // Usage Page (Buttons) # 0x19, 0x01, // Usage Minimum (Button 1) # 0x29, 0x03, // Usage Maximum (Button 3) # 0x15, 0x00, // Logical Minimum (0) # 0x25, 0x01, // Logical Maximum (1) # 0x95, 0x03, // Report Count (3) # 0x75, 0x01, // Report Size (1) # 0x81, 0x02, // Input (Data, Variable, Absolute) # 0x95, 0x01, // Report Count (1) # 0x75, 0x05, // Report Size (5) # 0x81, 0x03, // Input (Constant, Variable, Absolute) # 0x05, 0x01, // Usage Page (Generic Desktop) # 0x09, 0x30, // Usage (X) # 0x09, 0x31, // Usage (Y) # 0x15, 0x00, // Logical Minimum (0) # 0x26, 0xff, 0x7f, // Logical Maximum (32767) # 0x75, 0x10, // Report Size (16) # 0x95, 0x02, // Report Count (2) # 0x81, 0x02, // Input (Data, Variable, Absolute) # 0xc0, // End Collection # 0xc0 // End Collection # Quote Link to comment Share on other sites More sharing options...
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