ESP32-USB-Soft-Host

ESP32-USB-Soft-Host copied to clipboard

This lib is perfect, I just don´t know how to decode the data received to scan code.

Can you help me?

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.

@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