Hold CAPS

[techpaul]

Hold CAPS

[techpaul]

I am having trouble understanding what you mean as you are using conflicting terms.

Repetitions of make codes (when key is pressed) is standard because this is the Typematic repeat performed by the keyboard, you can set the library to ignore repeats on SOME keys like CTRL, SHIFT, CAPS LOCK, ALT, SCROLL LOCK, NUM LOCK, if that is what YOU wish

The bottom 8 bits is always equivalent to ASCII upper case for A to Z, it is the upper 8 bits that determine what the status of make/break and other states like simultaneous keys Shift, Ctrl, Alt or GUI are pressed at same. Remembering CAPS is done by the CAPS LOCK key not any other key. Once pressed the CAPS LOCK LED is lit, until next time Caps Lock is pressed.

When you say "LCTRL" I assume you mean Left Control (CTRL) key which is a DIFFERENT function.

See folder in your installed library called "extra" for the documentation

There is a bit in the returned code that says if this is a Make or Break code, the following constants tell you different things

Constant		Description
PS2_BREAK		This is a key break event (key release)
PS2_SHIFT		One of the SHIFT keys is STILL pressed at same time
PS2_CTRL		One of the CTRL keys is STILL pressed at same time
PS2_ALT		The (left) ALT key is STILL pressed at same time
PS2_ALT_GR		The (right) ALT or ALT-GR key is STILL pressed at same time
PS2_GUI		One of the GUI keys is STILL pressed at same time
PS2_CAPS		CAPS LOCK mode is on
PS2_FUNCTION		Keycode is a NON-displayable code function code

To capture release events you MUST remember that the returned value form the library is an unsigned 16 bit int (uint16_t), to check for release code you need to AND the value with PS2_BREAK to see if this is a release event.

Key code values for BOTTOM 8 bits on functions like Shift are

    PS2_KEY_NUM
    PS2_KEY_SCROLL
    PS2_KEY_CAPS
    PS2_KEY_PRTSCR
    PS2_KEY_PAUSE
    PS2_KEY_L_SHIFT
    PS2_KEY_R_SHIFT
    PS2_KEY_L_CTRL
    PS2_KEY_R_CTRL
    PS2_KEY_L_ALT
    PS2_KEY_R_ALT
    PS2_KEY_L_GUI   (Sometimes called windows key)
    PS2_KEY_R_GUI   (Sometimes called windows key)
    PS2_KEY_MENU

Your description of problem suggests either misunderstanding of keyboard operations or not handling the values returned from the library correctly.

[EPecherkin]

Yes, all that is right. Therefore there is a difference from the original behavior (if I connect keyboard directly to the computer).
Let's talk about computer games. You can map your CAPSLOCK key to Sit for example. And why you hold it - you sit. You release it - you stand up. With the current implementation of the library - I can't get the same behavior because there is simply no event when the CAPSLOCK key is released. Only when pressed.
I would like to find a way to catch an event when CAPSLOCK is released OR change the behavior of the CAPSLOCK key to act as LEFT CTRL (with press/release events of course)

[techpaul]

Can I suggest you should probably have either used the simpler RAW library https://github.com/techpaul/PS2KeyRaw or
you are welcome to fork a branch to change operation.

Vast majority os users are looking for ways to remove confusion on decoding every event and get filtered data in easier to understand data form to their application or add internationalisation.