Teensy as keyboard: error: 'keyboard_leds' was not declared in this scope

Question

I'm new to Teensy, and I'm trying to write a program that allows it to act as a keyboard. To make my program more useful, I'd like to make it not try to act on any input until its drivers install. I saw on GitHub that a way to do this (assuming the user doesn't hit it themselves) is to instruct the program to hit caps lock until the LED turns on. The function I wrote looks like this:

void waitForInstall(){
    boolean currCaps = keyboard_leds;
    while ((currCaps & 2) == (keyboard_leds & 2)){
        delay(200);
        Keyboard.set_key1(KEY_CAPS_LOCK);
        Keyboard.send_now();
    }
}

When I try to compile this, Arduino IDE informs me that 'keyboard_leds' was not declared in this scope. I'm sure I made a very basic mistake, but would anyone mind humoring me and giving me a push in the right direction? Thanks!

Is there a header you need to include? – Notlikethat Oct 20 '15 at 08:37 — Notlikethat, Oct 20 '15 at 08:37
Did you include the "usb_keyboard.h" header? – Sergio Internicola Oct 20 '15 at 09:32 — Sergio Internicola, Oct 20 '15 at 09:32

score 0 · Answer 1 · answered Jan 25 '17 at 06:17

keyboard_leds is a variable delcared in usb_private.h. This doesn't get included by default, and explicitly including it caused duplicate method errors. I wound up adding this

#include "usb_private.h"

to hardware/teensy/avr/cores/usb_hid/usb_hid.h

And that did the trick.

score 0 · Answer 2 · edited Dec 09 '22 at 17:15

0

Add #include "usb_private.h" to hardware/teensy/avr/cores/usb_serial_hid/usb_api.h

edited Dec 09 '22 at 17:15

Eric Aya

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answered Dec 09 '22 at 10:52

weigu

1

Hi Eric, It is not, the name of the file changed – weigu Dec 09 '22 at 16:43
Indeed. I've improved visibility of this detail in your answer and removed my downvote. – Eric Aya Dec 09 '22 at 17:16

score -1 · Answer 3 · answered Aug 22 '18 at 18:11

-1

You have to select which USB profile you want in the Tools => USB Type

It has to include "Keyboard" to define the keyboard_leds as available.

You probably want the "Serial + Keyboard + Mouse + Joystick" USB Type.

answered Aug 22 '18 at 18:11

Bruce Barnett

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Teensy as keyboard: error: 'keyboard_leds' was not declared in this scope

3 Answers3