FreeRTOS/Demo/CORTEX_AT91SAM3U256_IAR/system/led.c

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * 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 disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
 * ----------------------------------------------------------------------------
 */

//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------

#include "led.h"
#include <board.h>
#include <pio/pio.h>

//------------------------------------------------------------------------------
//         Local Variables
//------------------------------------------------------------------------------

#ifdef PINS_LEDS
static const Pin pinsLeds[] = {PINS_LEDS};
static const unsigned int numLeds = PIO_LISTSIZE(pinsLeds);
#endif

//------------------------------------------------------------------------------
//         Global Functions
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
/// Configures the pin associated with the given LED number. If the LED does
/// not exist on the board, the function does nothing.
/// \param led  Number of the LED to configure.
/// \return 1 if the LED exists and has been configured; otherwise 0.
//------------------------------------------------------------------------------
unsigned char LED_Configure(unsigned int led)
{
#ifdef PINS_LEDS
    // Check that LED exists
    if (led >= numLeds) {

        return 0;
    }

    // Configure LED
    return (PIO_Configure(&pinsLeds[led], 1));
#else
    return 0;
#endif
}

//------------------------------------------------------------------------------
/// Turns the given LED on if it exists; otherwise does nothing.
/// \param led  Number of the LED to turn on.
/// \return 1 if the LED has been turned on; 0 otherwise.
//------------------------------------------------------------------------------
unsigned char LED_Set(unsigned int led)
{
#ifdef PINS_LEDS
    // Check if LED exists
    if (led >= numLeds) {

        return 0;
    }

    // Turn LED on
    if (pinsLeds[led].type == PIO_OUTPUT_0) {

        PIO_Set(&pinsLeds[led]);
    }
    else {

        PIO_Clear(&pinsLeds[led]);
    }

    return 1;
#else
    return 0;
#endif
}

//------------------------------------------------------------------------------
/// Turns a LED off.
/// \param led  Number of the LED to turn off.
/// \param 1 if the LED has been turned off; 0 otherwise.
//------------------------------------------------------------------------------
unsigned char LED_Clear(unsigned int led)
{
#ifdef PINS_LEDS
    // Check if LED exists
    if (led >= numLeds) {

        return 0;
    }

    // Turn LED off
    if (pinsLeds[led].type == PIO_OUTPUT_0) {

        PIO_Clear(&pinsLeds[led]);
    }
    else {

        PIO_Set(&pinsLeds[led]);
    }

    return 1;
#else
    return 0;
#endif
}

//------------------------------------------------------------------------------
/// Toggles the current state of a LED.
/// \param led  Number of the LED to toggle.
/// \return 1 if the LED has been toggled; otherwise 0.
//------------------------------------------------------------------------------
unsigned char LED_Toggle(unsigned int led)
{
#ifdef PINS_LEDS
    // Check if LED exists
    if (led >= numLeds) {

        return 0;
    }

    // Toggle LED
    if (PIO_GetOutputDataStatus(&pinsLeds[led])) {

        PIO_Clear(&pinsLeds[led]);
    }
    else {

        PIO_Set(&pinsLeds[led]);
    }

    return 1;
#else
    return 0;
#endif
}