69 rivejä
2.4 KiB
C++
69 rivejä
2.4 KiB
C++
#include "Code_LEDLock.h"
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/* USB_LED_bit are codes from http://www.usb.org/developers/hidpage/HID1_11.pdf keyboard output report
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*/
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Code_LEDLock::Code_LEDLock(const uint16_t scancode, LEDInterface& refLED)
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: scancode(scancode), refLED(refLED)
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{
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switch (scancode) //initilize USB_LED_bit for given scancode
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{
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case KEY_NUM_LOCK:
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USB_LED_bit = 1<<0;
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break;
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case KEY_CAPS_LOCK:
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USB_LED_bit = 1<<1;
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break;
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case KEY_SCROLL_LOCK:
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USB_LED_bit = 1<<2;
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break;
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/* guessing at these case names:
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case KEY_COMPOSE: //for separate accent keys
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USB_LED_bit = 1<<3; break;
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break;
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case KEY_KANA: //for Japanese keyboards
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USB_LED_bit = 1<<4; break;
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break;
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*/
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}
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}
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void Code_LEDLock::press()
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{
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Keyboard.press(scancode);
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updateLED();
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}
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void Code_LEDLock::release()
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{
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Keyboard.release(scancode);
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}
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/* This comment is for Arduino board, because Arduino boards may need a different implementation.
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updateLED() has NOT been tested on an Arduino board.
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updateLED() has been tested on teensy 2.0 (not an Arduino board).
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The variable "keyboard_leds" is in /opt/arduino-1.6.7/hardware/teensy/avr/cores/usb_hid/usb.c
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// 1=num lock, 2=caps lock, 4=scroll lock, 8=compose, 16=kana
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https://forum.pjrc.com/threads/25368-How-do-I-receive-a-numlock-capslock-LED-signal-from-the-PC
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The word "keyboard_leds does not appear in "Arduino\hardware\arduino\cores\
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This shows how to hack KeyReport in Arduino: https://www.sparkfun.com/tutorials/337
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TMK firmware, which is not Arduino, uses variable "usb_led" instead of "keyboard_leds"
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http://deskthority.net/workshop-f7/how-to-build-your-very-own-keyboard-firmware-t7177.html >usb_led
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*/
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void Code_LEDLock::updateLED() const
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{
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/* KEY_SCROLL_LOCK is not working on Linux with Teensy2.0.
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This debug code prints "keyboard_leds=0" when scrollLock is pressed:
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Keyboard.print(F(" keyboard_leds="));
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Keyboard.print(keyboard_leds); //KEY_NUM_LOCK:1, KEY_CAPS_LOCK:2, KEY_SCROLL_LOCK:0
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Keyboard.print(" ");
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*/
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if (keyboard_leds & USB_LED_bit) //if USB_LED_bit is set
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{
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refLED.off(); //LED on-off seem inverted, but it works for active low and active high
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}
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else
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{
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refLED.on();
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}
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}
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