Comments (2)
zbx-sadman
commented on May 23, 2024
1
@nogueira , it simple for standart HID keyboards with standart "keyboard report" (as my Logitech K120).
Format is: 1 byte for key modifiers (Alt, Ctrl, Shift, Win) - 1 byte reserved (always 0x00) - 6 bytes for up to six keys pressed simultaneously.
HID codes you can find here: "HID Usage Tables FOR Universal Serial Bus (USB) Version 1.21" (Keyboard/Keypad Page (0x07) )
Key modifiers are defined in the IEEE HID Spec as follows:
LEFT CONTROL 1 # 00000001 as binary
LEFT SHIFT 2 # 00000010
LEFT ALT 4 # 00000100
LEFT CMD|WIN 8 # 00001000
RIGHT CONTROL 16 # 00010000
RIGHT SHIFT 32 # 00100000
RIGHT ALT 64 # 01000000
RIGHT CMD|WIN 128 # 10000000
For example:
Right arrow (0x4f) pressed
in :00 00 4f 00 00 00 00 00
All keys released
in :00 00 00 00 00 00 00 00
Left arrow (0x50) pressed
in :00 00 50 00 00 00 00 00
All keys released
in :00 00 00 00 00 00 00 00
Enter (0x28) pressed
in :00 00 28 00 00 00 00 00
All keys released
in :00 00 00 00 00 00 00 00
Ctrl (0x10, B0001 0000) pressed
in :10 00 00 00 00 00 00 00
Ctrl+Enter (0x28) pressed
in :10 00 28 00 00 00 00 00
Enter (0x28) released
in :10 00 00 00 00 00 00 00
All keys released
in :00 00 00 00 00 00 00 00
from esp32-usb-soft-host.
tobozo
commented on May 23, 2024
Hey Octavio, thanks for the feedback,
The sketches in the example folder implement the data decoding for a keyboard only (unfortunately I couldn't get a mouse to work).
The KeyboardReportParser used in the examples is heavily based on USB_Host_Shield_2.0 source code, so if you're trying to detect something else it may be a good start.
from esp32-usb-soft-host.
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from esp32-usb-soft-host.