LibrePilot/flight/pios/stm32f10x/pios_led.c

/**
 ******************************************************************************
 * @addtogroup PIOS PIOS Core hardware abstraction layer
 * @{
 * @addtogroup PIOS_LED LED Functions
 * @brief STM32 Hardware LED handling code
 * @{
 *
 * @file       pios_led.c
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
 * @brief      LED functions, init, toggle, on & off.
 * @see        The GNU Public License (GPL) Version 3
 *
 *****************************************************************************/
/*
 * 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 3 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, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "pios.h"

#ifdef PIOS_INCLUDE_LED

#include <pios_led_priv.h>

static const struct pios_led_cfg *led_cfg;

/**
 * Initialises all the LED's
 */
int32_t PIOS_LED_Init(const struct pios_led_cfg *cfg)
{
    PIOS_Assert(cfg);

    /* Store away the config in a global used by API functions */
    led_cfg = cfg;

    for (uint8_t i = 0; i < cfg->num_leds; i++) {
        const struct pios_led *led = &(cfg->leds[i]);

        /* Enable the peripheral clock for the GPIO */
        switch ((uint32_t)led->pin.gpio) {
        case (uint32_t)GPIOA:
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
            break;
        case (uint32_t)GPIOB:
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
            break;
        case (uint32_t)GPIOC:
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
            break;
        default:
            PIOS_Assert(0);
            break;
        }

        if (led->remap) {
            GPIO_PinRemapConfig(led->remap, ENABLE);
        }

        GPIO_Init(led->pin.gpio, &led->pin.init);

        PIOS_LED_Off(i);
    }

    return 0;
}

/**
 * Turn on LED
 * \param[in] LED LED id
 */
void PIOS_LED_On(uint32_t led_id)
{
    PIOS_Assert(led_cfg);

    if (led_id >= led_cfg->num_leds) {
        /* LED index out of range */
        return;
    }

    const struct pios_led *led = &(led_cfg->leds[led_id]);

    if (led->active_high) {
        GPIO_SetBits(led->pin.gpio, led->pin.init.GPIO_Pin);
    } else {
        GPIO_ResetBits(led->pin.gpio, led->pin.init.GPIO_Pin);
    }
}

/**
 * Turn off LED
 * \param[in] LED LED id
 */
void PIOS_LED_Off(uint32_t led_id)
{
    PIOS_Assert(led_cfg);

    if (led_id >= led_cfg->num_leds) {
        /* LED index out of range */
        return;
    }

    const struct pios_led *led = &(led_cfg->leds[led_id]);

    if (led->active_high) {
        GPIO_ResetBits(led->pin.gpio, led->pin.init.GPIO_Pin);
    } else {
        GPIO_SetBits(led->pin.gpio, led->pin.init.GPIO_Pin);
    }
}

/**
 * Toggle LED on/off
 * \param[in] LED LED id
 */
void PIOS_LED_Toggle(uint32_t led_id)
{
    PIOS_Assert(led_cfg);

    if (led_id >= led_cfg->num_leds) {
        /* LED index out of range */
        return;
    }

    const struct pios_led *led = &(led_cfg->leds[led_id]);

    if (GPIO_ReadOutputDataBit(led->pin.gpio, led->pin.init.GPIO_Pin) == Bit_SET) {
        if (led->active_high) {
            PIOS_LED_Off(led_id);
        } else {
            PIOS_LED_On(led_id);
        }
    } else {
        if (led->active_high) {
            PIOS_LED_On(led_id);
        } else {
            PIOS_LED_Off(led_id);
        }
    }
}

#endif /* PIOS_INCLUDE_LED */

/**
 * @}
 * @}
 */