text: /****************************************************************************
   * boards/arm/kinetis/twr-k60n512/src/k60_buttons.c
   *
   *   Copyright (C) 2011, 2014-2015, 2017 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.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <errno.h>
  
  #include <nuttx/arch.h>
  #include <nuttx/board.h>
  #include <arch/board/board.h>
  
  #include "twr-k60n512.h"
  
  #ifdef CONFIG_ARCH_BUTTONS
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  /* The TWR-K60N512 has user buttons (plus a reset button):
   *
   * 1. SW1 (IRQ0)   PTA19
   * 2. SW2 (IRQ1)   PTE26
   */
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: board_button_initialize
   *
   * Description:
   *   board_button_initialize() must be called to initialize button resources.
   *   After that, board_buttons() may be called to collect the current state
   *   of all buttons or board_button_irq() may be called to register button
   *   interrupt handlers.
   *
   ****************************************************************************/
  
  void board_button_initialize(void)
  {
    /* Configure the two buttons as inputs */
  
    kinetis_pinconfig(GPIO_SW1);
    kinetis_pinconfig(GPIO_SW2);
  }
  
  /****************************************************************************
   * Name: board_buttons
   ****************************************************************************/
  
  uint32_t board_buttons(void)
  {
    uint32_t ret = 0;
  
    if (kinetis_gpioread(GPIO_SW1))
      {
        ret |= BUTTON_SW1_BIT;
      }
  
    if (kinetis_gpioread(GPIO_SW2))
      {
        ret |= BUTTON_SW2_BIT;
      }
  
    return ret
  }
  
  /****************************************************************************
   * Button support.
   *
   * Description:
   *   board_button_initialize() must be called to initialize button resources.
   *   After that, board_buttons() may be called to collect the current state
   *   of all buttons or board_button_irq() may be called to register button
   *   interrupt handlers.
   *
   *   After board_button_initialize() has been called, board_buttons() may be
   *   called to collect the state of all buttons.  board_buttons() returns an
   *   32-bit bit set with each bit associated with a button.
   *   See the BUTTON_*_BIT and JOYSTICK_*_BIT definitions in board.h for the
   *   meaning of each bit.
   *
   *   board_button_irq() may be called to register an interrupt handler that
   *   will be called when a button is depressed or released.
   *   The ID value is a button enumeration value that uniquely identifies a
   *   button resource. See the BUTTON_* and JOYSTICK_* definitions in board.h
   *   for the meaning of enumeration value.
   *
   ****************************************************************************/
  
  #ifdef CONFIG_ARCH_IRQBUTTONS
  int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
  {
    uint32_t pinset;
  
    /* Map the button id to the GPIO bit set. */
  
    if (id == BUTTON_SW1)
      {
        pinset = GPIO_SW1;
      }
    else if (id == BUTTON_SW2)
      {
        pinset = GPIO_SW2;
      }
    else
      {
        return -EINVAL;
      }
  
    /* The button has already been configured as an interrupting input (by
     * board_button_initialize() above).
     *
     * Attach the new button handler.
     */
  
    ret = kinetis_pinirqattach(pinset, irqhandler, arg);
    if (ret >= 0)
      {
        /* Then make sure that interrupts are enabled on the pin */
  
        kinetis_pindmaenable(pinset);
      }
  
    return ret;
  }
  #endif
  #endif /* CONFIG_ARCH_BUTTONS */
  