text: /************************************************************************************
   * arch/arm/src/lpc43xx/lpc43_gpioint.h
   *
   *   Copyright (C) 2012, 2014 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.
   *
   ************************************************************************************/
  /* GPIO pin interrupts
   *
   * From all available GPIO pins, up to eight pins can be selected in the system
   * control block to serve as external interrupt pins. The external interrupt pins
   * are connected to eight individual interrupts in the NVIC and are created based
   * on rising or falling edges or on the input level on the pin.
   *
   * GPIO group interrupt
   *
   * For each port/pin connected to one of the two the GPIO Grouped Interrupt blocks
   * (GROUP0 and GROUP1), the GPIO grouped interrupt registers determine which pins are
   * enabled to generate interrupts and what the active polarities of each of those
   * inputs are. The GPIO grouped interrupt registers also select whether the interrupt
   * output will be level or edge triggered and whether it will be based on the OR or
   * the AND of all of the enabled inputs.
   */
  
  #ifndef __ARCH_ARM_SRC_LPC43XX_LPC43_GPIOINT_H
  #define __ARCH_ARM_SRC_LPC43XX_LPC43_GPIOINT_H
  
  /************************************************************************************
   * Included Files
   ************************************************************************************/
  
  #include <nuttx/config.h>
  #include "chip.h"
  #include "chip/lpc43_gpio.h"
  
  #ifdef CONFIG_GPIO_IRQ
  
  /************************************************************************************
   * Pre-processor Definitions
   ************************************************************************************/
  
  /************************************************************************************
   * Public Types
   ************************************************************************************/
  
  /************************************************************************************
   * Public Data
   ************************************************************************************/
  
  /************************************************************************************
   * Public Functions
   ************************************************************************************/
  
  /****************************************************************************
   * Name: lpc43_gpioint_grpinitialize
   *
   * Description:
   *   Initialize the properties of a GPIO group.  The properties of the group
   *   should be configured before any pins are added to the group by
   *   lpc32_gpioint_grpconfig().  As side effects, this call also removes
   *   all pins from the group and disables the group interrupt.  On return,
   *   this is a properly configured, empty GPIO interrupt group.
   *
   * Returned Value:
   *   Zero on success; a negated errno value on failure.
   *
   * Assumptions:
   *   Interrupts are disabled so that read-modify-write operations are safe.
   *
   ****************************************************************************/
  
  int lpc43_gpioint_grpinitialize(int group, bool anded, bool level);
  
  /****************************************************************************
   * Name: lpc43_gpioint_pinconfig
   *
   * Description:
   *   Configure a GPIO pin as an GPIO pin interrupt source (after it has been
   *   configured as an input).  This function should *not* be called directly
   *   from user application code; user code should call this function only
   *   indirectly through lpc32_gpio_config().
   *
   * Returned Value:
   *   Zero on success; a negated errno value on failure.
   *
   * Assumptions:
   *   Interrupts are disabled so that read-modify-write operations are safe.
   *
   ****************************************************************************/
  
  int lpc43_gpioint_pinconfig(uint16_t gpiocfg);
  
  /****************************************************************************
   * Name: lpc43_gpioint_grpconfig
   *
   * Description:
   *   Configure a GPIO pin as an GPIO group interrupt member (after it has been
   *   configured as an input).  This function should *not* be called directly
   *   from user application code; user code should call this function only
   *   indirectly through lpc32_gpio_config().
   *
   * Returned Value:
   *   Zero on success; a negated errno value on failure.
   *
   * Assumptions:
   *   Interrupts are disabled so that read-modify-write operations are safe.
   *
   ****************************************************************************/
  
  int lpc43_gpioint_grpconfig(uint16_t gpiocfg);
  
  #endif /* CONFIG_GPIO_IRQ */
  #endif /* __ARCH_ARM_SRC_LPC43XX_LPC43_GPIOINT_H */
  