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Added documentation for PS/2 mouse in readme

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ofples 2016-11-25 12:10:44 +02:00
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readme.md
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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