led.c

/*
Copyright 2012 Jun Wako <wakojun@gmail.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <avr/io.h>
#include "stdint.h"
#include "led.h"


/* LED pin configuration
 * Scroll Lock: Low PE6
 * Caps Lock: Low PB0
 */
void led_set(uint8_t usb_led)
{
    // Set as output.
    DDRB |= (1<<0);
    DDRE |= (1<<6);

    if (usb_led & (1<<USB_LED_CAPS_LOCK))
    {
        // Output low.
        PORTB &= ~(1<<0);
    }
    else
    {
        // Output high.
        PORTB |= (1<<0);
    }

    if (usb_led & (1<<USB_LED_SCROLL_LOCK))
    {
        // Output low.
        PORTE &= ~(1<<6);
    }
    else
    {
        // Output high.
        PORTE |= (1<<6);
    }
}