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60 lines
1.7 KiB
60 lines
1.7 KiB
7 years ago
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/**
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* Backlighting code for PS2AVRGB boards (ATMEGA32A)
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* Kenneth A. (github.com/krusli | krusli.me)
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*/
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#include "quantum.h"
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#include <avr/pgmspace.h>
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#include <avr/interrupt.h>
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// Port D: digital pins of the AVR chipset
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#define NUMLOCK_PORT (1 << 1) // 1st pin of Port D (digital)
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#define CAPSLOCK_PORT (1 << 2) // 2nd pin
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#define BACKLIGHT_PORT (1 << 4) // 4th pin
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#define SCROLLLOCK_PORT (1 << 6) // 6th pin
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/**
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* References
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* Port Registers: https://www.arduino.cc/en/Reference/PortManipulation
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* TCCR1A: https://electronics.stackexchange.com/questions/92350/what-is-the-difference-between-tccr1a-and-tccr1b
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* Timers: http://www.avrbeginners.net/architecture/timers/timers.html
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* 16-bit timer setup: http://sculland.com/ATmega168/Interrupts-And-Timers/16-Bit-Timer-Setup/
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* PS2AVRGB firmware: https://github.com/showjean/ps2avrU/tree/master/firmware
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*/
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// @Override
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// turn LEDs on and off depending on USB caps/num/scroll lock states.
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void led_set_user(uint8_t usb_led) {
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/* It appears that these cause the v1 JJ40 PCB to hang.
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* I haven't looked into why, but I don't have any LEDs on my board anyway. */
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#if 0
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if (usb_led & (1 << USB_LED_NUM_LOCK)) {
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// turn on
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DDRD |= NUMLOCK_PORT;
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PORTD |= NUMLOCK_PORT;
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} else {
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// turn off
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DDRD &= ~NUMLOCK_PORT;
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PORTD &= ~NUMLOCK_PORT;
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}
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if (usb_led & (1 << USB_LED_CAPS_LOCK)) {
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DDRD |= CAPSLOCK_PORT;
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PORTD |= CAPSLOCK_PORT;
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} else {
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DDRD &= ~CAPSLOCK_PORT;
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PORTD &= ~CAPSLOCK_PORT;
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}
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if (usb_led & (1 << USB_LED_SCROLL_LOCK)) {
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DDRD |= SCROLLLOCK_PORT;
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PORTD |= SCROLLLOCK_PORT;
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} else {
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DDRD &= ~SCROLLLOCK_PORT;
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PORTD &= ~SCROLLLOCK_PORT;
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}
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#endif
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}
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