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| @@ -1157,6 +1157,45 @@ The firmware supports 5 different light effects, and the color (hue, saturation,  Please note the USB port can only supply a limited amount of power to the keyboard (500mA by standard, however, modern computer and most usb hubs can provide 700+mA.). According to the data of NeoPixel from Adafruit, 30 WS2812 LEDs require a 5V 1A power supply, LEDs used in this mod should not more than 20. +## PS/2 Mouse Support + +Its possible to hook up a PS/2 mouse (for example touchpads or trackpoints) to your keyboard as a composite device. +In order to do this you must first enable the option in your Makefile. + +    PS2_MOUSE_ENABLE = yes + +Then, decide whether to use interrupts (better if your microcontroller supports them) or busywait, and enable the relevant option. + +    PS2_USE_INT = yes +    // PS2_USE_BUSYWAIT = yes + +If you're using a teensy and have hooked up the clock on your PS/2 device to D1 and the data to D0, you're all set. +Otherwise, you will need to update the following defines in your `config.h`: +     +    #define PS2_CLOCK_PORT  PORTD +    #define PS2_CLOCK_PIN   PIND +    #define PS2_CLOCK_DDR   DDRD +    #define PS2_CLOCK_BIT   1 + +    #define PS2_DATA_PORT   PORTD +    #define PS2_DATA_PIN    PIND +    #define PS2_DATA_DDR    DDRD +    #define PS2_DATA_BIT    0 + +And with `PS2_USE_INT` also define these macros: + +    #define PS2_INT_INIT()  do {    \ +        EICRA |= ((1<<ISC11) |      \ +                  (0<<ISC10));      \ +    } while (0) +    #define PS2_INT_ON()  do {      \ +        EIMSK |= (1<<INT1);         \ +    } while (0) +    #define PS2_INT_OFF() do {      \ +        EIMSK &= ~(1<<INT1);        \ +    } while (0) +    #define PS2_INT_VECT    INT1_vect +  ## Safety Considerations  You probably don't want to "brick" your keyboard, making it impossible | 
