led.c

/*
 * Copyright (c) 2015-2016 by Willem Dijkstra <wpd@xs4all.nl>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * Neither the name of the auhor nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Led
 *
 * Drive keyboard leds
 */

#include <stdlib.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include "led.h"

void
led_init(void)
{
    rcc_periph_clock_enable(LEDS_RCC);
    gpio_set_mode(LEDS_GPIO, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LEDS_BV);
}

void
led_clear(uint8_t leds)
{
    if (leds & 0b0001)
        gpio_clear(LEDS_GPIO, LED1IO);

    if (leds & 0b0010)
        gpio_clear(LEDS_GPIO, LED2IO);

    if (leds & 0b0100)
        gpio_clear(LEDS_GPIO, LED3IO);

    if (leds & 0b1000)
        gpio_clear(LEDS_GPIO, LED4IO);
}

void
led_set(uint8_t leds)
{
    if (leds & 0b0001)
        gpio_set(LEDS_GPIO, LED1IO);

    if (leds & 0b0010)
        gpio_set(LEDS_GPIO, LED2IO);

    if (leds & 0b0100)
        gpio_set(LEDS_GPIO, LED3IO);

    if (leds & 0b1000)
        gpio_set(LEDS_GPIO, LED4IO);
}

void
led_state(uint8_t leds)
{
    if (leds & 0b0001)
        gpio_set(LEDS_GPIO, LED1IO);
    else
        gpio_clear(LEDS_GPIO, LED1IO);

    if (leds & 0b0010)
        gpio_set(LEDS_GPIO, LED2IO);
    else
        gpio_clear(LEDS_GPIO, LED2IO);

    if (leds & 0b0100)
        gpio_set(LEDS_GPIO, LED3IO);
    else
        gpio_clear(LEDS_GPIO, LED3IO);

    if (leds & 0b1000)
        gpio_set(LEDS_GPIO, LED4IO);
    else
        gpio_clear(LEDS_GPIO, LED4IO);
}