nuttx/configs/fire-stm32v2/src/stm32_buttons.c

/****************************************************************************
 * configs/fire-stm32v2/src/stm32_buttons.c
 *
 *   Copyright (C) 2012, 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 "fire-stm32v2.h"

#ifdef CONFIG_ARCH_BUTTONS

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

/****************************************************************************
 * 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 GPIO pins as inputs.  NOTE that EXTI interrupts are
   * configured for some pins but NOT used in this file
   */

  stm32_configgpio(GPIO_BTN_KEY1);
  stm32_configgpio(GPIO_BTN_KEY2);
}

/****************************************************************************
 * Name: board_buttons
 ****************************************************************************/

uint32_t board_buttons(void)
{
  uint32_t ret = 0;

  /* Check that state of each key.  A LOW value means that the key is pressed, */

  if (!stm32_gpioread(GPIO_BTN_KEY1))
    {
      ret |= BUTTON_KEY1_BIT;
    }

  if (!stm32_gpioread(GPIO_BTN_KEY2))
    {
      ret |= BUTTON_KEY2_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 values.
 *
 ****************************************************************************/

#ifdef CONFIG_ARCH_IRQBUTTONS
int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
{
  uint16_t gpio;
  int ret;

  if (id == BUTTON_KEY1)
    {
      gpio = GPIO_KEY1;
    }
  else if (id == BUTTON_KEY2)
    {
      gpio = GPIO_KEY2;
    }
  else
    {
      return -EINVAL;
    }

  return stm32_gpiosetevent(gpio, true, true, true, irqhandler, arg);
}
#endif
#endif /* CONFIG_ARCH_BUTTONS */