/****************************************************************************
 * configs/efm32gg-stk3700/include/efm32_autoleds.c
 *
 *   Copyright (C) 2014-2015 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name NuttX 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
 * COPYRIGHT OWNER OR CONTRIBUTORS 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.
 *
 ****************************************************************************/
/* The EFM32 Giant Gecko Start Kit has two yellow LEDs marked LED0 and LED1.
 * These LEDs are controlled by GPIO pins on the EFM32.  The LEDs are
 * connected to pins PE2 and PE3 in an active high configuration:
 *
 * ------------------------------------- --------------------
 * EFM32 PIN                             BOARD SIGNALS
 * ------------------------------------- --------------------
 * E2/BCK_VOUT/EBI_A09 #0/               MCU_PE2 UIF_LED0
 *   TIM3_CC2 #1/U1_TX #3/ACMP0_O #1
 * E3/BCK_STAT/EBI_A10 #0/U1_RX #3/      MCU_PE3 UIF_LED1
 *   ACMP1_O #1
 * ------------------------------------- --------------------
 *
 * All LEDs are grounded and so are illuminated by outputting a high
 * value to the LED.
 *
 * These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
 * defined.  In that case, the usage by the board port is defined in
 * include/board.h and src/efm32_autoleds.c.  The LEDs are used to
 * encode OS-related events as follows:
 *
 *   SYMBOL               Meaning                      LED state
 *                                                   LED0     LED1
 *   -------------------  -----------------------  -------- --------
 *   LED_STARTED          NuttX has been started     OFF      OFF
 *   LED_HEAPALLOCATE     Heap has been allocated    OFF      OFF
 *   LED_IRQSENABLED      Interrupts enabled         OFF      OFF
 *   LED_STACKCREATED     Idle stack created         ON       OFF
 *   LED_INIRQ            In an interrupt              No change
 *   LED_SIGNAL           In a signal handler          No change
 *   LED_ASSERTION        An assertion failed          No change
 *   LED_PANIC            The system has crashed     OFF      Blinking
 *   LED_IDLE             STM32 is is sleep mode       Not used
 *
 * Thus if LED0 statically on, NuttX has successfully booted and is,
 * apparently, running normally.  If LED1 is flashing at approximately
 * 2Hz, then a fatal error has been detected and the system has halted.
 */

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <stdbool.h>
#include <debug.h>

#include <nuttx/board.h>
#include <arch/board/board.h>

#include "efm32_gpio.h"
#include "efm32gg-stk3700.h"

#ifdef CONFIG_ARCH_LEDS

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
 * with CONFIG_DEBUG_VERBOSE too)
 */

#ifdef CONFIG_DEBUG_LEDS
#  define leddbg  lldbg
#  define ledvdbg llvdbg
#else
#  define leddbg(x...)
#  define ledvdbg(x...)
#endif

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: board_led_initialize
 ****************************************************************************/

void board_led_initialize(void)
{
  /* Configure LED PIOs for output */

  efm32_configgpio(GPIO_LED0);
  efm32_configgpio(GPIO_LED1);
}

/****************************************************************************
 * Name: board_led_on
 ****************************************************************************/

void board_led_on(int led)
{
  bool led0on = false;  /* High illuminates */
  bool led1on = false; /* High illuminates */

  switch (led)
    {
      case 0:  /* LED_STARTED, LED_HEAPALLOCATE, LED_IRQSENABLED */
        break;

      case 1:  /* LED_STACKCREATED */
        led0on = true;
        break;

      default:
      case 2:  /* LED_INIRQ, LED_SIGNAL, LED_ASSERTION */
        return;

      case 3:  /* LED_PANIC */
        led1on = true;
        break;
    }

  efm32_gpiowrite(GPIO_LED0, led0on);
  efm32_gpiowrite(GPIO_LED1, led1on);
}

/****************************************************************************
 * Name: board_led_off
 ****************************************************************************/

void board_led_off(int led)
{
  if (led != 2)
    {
      efm32_gpiowrite(GPIO_LED0, false);  /* High illuminates */
      efm32_gpiowrite(GPIO_LED1, false);  /* High illuminates */
    }
}

#endif /* CONFIG_ARCH_LEDS */
