* `make COLOR=false` - turns off color output
* `make SILENT=true` - turns off output besides errors/warnings
* `make VERBOSE=true` - outputs all of the gcc stuff (not interesting, unless you need to debug)
+* `make EXTRAFLAGS=-E` - Preprocess the code without doing any compiling (useful if you are trying to debug #define commands)
The make command itself also has some additional options, type `make --help` for more information. The most useful is probably `-jx`, which specifies that you want to compile using more than one CPU, the `x` represents the number of CPUs that you want to use. Setting that can greatly reduce the compile times, especially if you are compiling many keyboards/keymaps. I usually set it to one less than the number of CPUs that I have, so that I have some left for doing other things while it's compiling. Note that not all operating systems and make versions supports that option.
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