text: /****************************************************************************
   * boards/arm/stm32l4/nucleo-l476rg/src/stm32_gpio.c
   *
   *   Copyright (C) 2017-2018 Gregory Nutt. All rights reserved.
   *   Copyright (C) 2017 Alan Carvalho de Assis. All rights reserved.
   *   Author:  Alan Carvalho de Assis <acassis@gmail.com>
   *
   *   Based on: boards/sim/src/sim_gpio.c
   *   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.
   *
   ****************************************************************************/
  
  /* Added by: Ben vd Veen (DisruptiveNL) -- www.nuttx.nl */
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdbool.h>
  #include <assert.h>
  #include <debug.h>
  
  #include <nuttx/clock.h>
  #include <nuttx/wdog.h>
  #include <nuttx/ioexpander/gpio.h>
  
  #include <arch/board/board.h>
  
  #include "chip.h"
  
  #include <stm32l4.h>
  #include "nucleo-l476rg.h"
  
  #if defined(CONFIG_DEV_GPIO) && !defined(CONFIG_GPIO_LOWER_HALF)
  
  /****************************************************************************
   * Private Types
   ****************************************************************************/
  
  struct stm32gpio_dev_s
  {
    struct gpio_dev_s gpio;
    uint8_t id;
  };
  
  struct stm32gpint_dev_s
  {
    struct stm32gpio_dev_s stm32gpio;
    pin_interrupt_t callback;
  };
  
  /****************************************************************************
   * Private Function Prototypes
   ****************************************************************************/
  
  static int gpin_read(FAR struct gpio_dev_s *dev, FAR bool *value);
  static int gpout_read(FAR struct gpio_dev_s *dev, FAR bool *value);
  static int gpout_write(FAR struct gpio_dev_s *dev, bool value);
  static int gpint_read(FAR struct gpio_dev_s *dev, FAR bool *value);
  static int gpint_attach(FAR struct gpio_dev_s *dev,
                          pin_interrupt_t callback);
  static int gpint_enable(FAR struct gpio_dev_s *dev, bool enable);
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  static const struct gpio_operations_s gpin_ops =
  {
    .go_read   = gpin_read,
    .go_write  = NULL,
    .go_attach = NULL,
    .go_enable = NULL,
  };
  
  static const struct gpio_operations_s gpout_ops =
  {
    .go_read   = gpout_read,
    .go_write  = gpout_write,
    .go_attach = NULL,
    .go_enable = NULL,
  };
  
  static const struct gpio_operations_s gpint_ops =
  {
    .go_read   = gpint_read,
    .go_write  = NULL,
    .go_attach = gpint_attach,
    .go_enable = gpint_enable,
  };
  
  #if BOARD_NGPIOIN > 0
  /* This array maps the GPIO pins used as INPUT */
  
  static const uint32_t g_gpioinputs[BOARD_NGPIOIN] =
  {
    GPIO_IN1,
  };
  
  static struct stm32gpio_dev_s g_gpin[BOARD_NGPIOIN];
  #endif
  
  #if BOARD_NGPIOOUT
  /* This array maps the GPIO pins used as OUTPUT */
  
  static const uint32_t g_gpiooutputs[BOARD_NGPIOOUT] =
  {
    GPIO_OUT1,
  };
  
  static struct stm32gpio_dev_s g_gpout[BOARD_NGPIOOUT];
  #endif
  
  #if BOARD_NGPIOINT > 0
  /* This array maps the GPIO pins used as INTERRUPT INPUTS */
  
  static const uint32_t g_gpiointinputs[BOARD_NGPIOINT] =
  {
    GPIO_INT1,
  };
  
  static struct stm32gpint_dev_s g_gpint[BOARD_NGPIOINT];
  #endif
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  static int stm32gpio_interrupt(int irq, void *context, void *arg)
  {
    FAR struct stm32gpint_dev_s *stm32gpint = (FAR struct stm32gpint_dev_s *)arg;
  
    DEBUGASSERT(stm32gpint != NULL && stm32gpint->callback != NULL);
    gpioinfo("Interrupt! callback=%p\n", stm32gpint->callback);
  
    stm32gpint->callback(&stm32gpint->stm32gpio.gpio, tm32gpint->stm32gpio.id);
    return OK;
  }
  
  static int gpin_read(FAR struct gpio_dev_s *dev, FAR bool *value)
  {
    FAR struct stm32gpio_dev_s *stm32gpio = (FAR struct stm32gpio_dev_s *)dev;
  
    DEBUGASSERT(stm32gpio != NULL && value != NULL);
    DEBUGASSERT(stm32gpio->id < BOARD_NGPIOIN);
    gpioinfo("Reading...\n");
  
    *value = stm32l4_gpioread(g_gpioinputs[stm32gpio->id]);
    return OK;
  }
  
  static int gpout_read(FAR struct gpio_dev_s *dev, FAR bool *value)
  {
    FAR struct stm32gpio_dev_s *stm32gpio = (FAR struct stm32gpio_dev_s *)dev;
  
    DEBUGASSERT(stm32gpio != NULL && value != NULL);
    DEBUGASSERT(stm32gpio->id < BOARD_NGPIOOUT);
    gpioinfo("Reading...\n");
  
    *value = stm32l4_gpioread(g_gpiooutputs[stm32gpio->id]);
    return OK;
  }
  
  static int gpout_write(FAR struct gpio_dev_s *dev, bool value)
  {
    FAR struct stm32gpio_dev_s *stm32gpio = (FAR struct stm32gpio_dev_s *)dev;
  
    DEBUGASSERT(stm32gpio != NULL);
    DEBUGASSERT(stm32gpio->id < BOARD_NGPIOOUT);
    gpioinfo("Writing %d\n", (int)value);
  
    stm32l4_gpiowrite(g_gpiooutputs[stm32gpio->id], value);
    return OK;
  }
  
  static int gpint_read(FAR struct gpio_dev_s *dev, FAR bool *value)
  {
    FAR struct stm32gpint_dev_s *stm32gpint = (FAR struct stm32gpint_dev_s *)dev;
  
    DEBUGASSERT(stm32gpint != NULL && value != NULL);
    DEBUGASSERT(stm32gpint->stm32gpio.id < BOARD_NGPIOINT);
    gpioinfo("Reading int pin...\n");
  
    *value = stm32l4_gpioread(g_gpiointinputs[stm32gpint->stm32gpio.id]);
    return OK;
  }
  
  static int gpint_attach(FAR struct gpio_dev_s *dev,
                          pin_interrupt_t callback)
  {
    FAR struct stm32gpint_dev_s *stm32gpint = (FAR struct stm32gpint_dev_s *)dev;
  
    gpioinfo("Attaching the callback\n");
  
    /* Make sure the interrupt is disabled */
  
    stm32l4_gpiosetevent(g_gpiointinputs[stm32gpint->stm32gpio.id], false,
                         false, false, NULL, NULL);
  
    gpioinfo("Attach %p\n", callback);
    stm32gpint->callback = callback;
    return OK;
  }
  
  static int gpint_enable(FAR struct gpio_dev_s *dev, bool enable)
  {
    FAR struct stm32gpint_dev_s *stm32gpint = (FAR struct stm32gpint_dev_s *)dev;
  
    if (enable)
      {
        if (stm32gpint->callback != NULL)
          {
            gpioinfo("Enabling the interrupt\n");
  
            /* Configure the interrupt for rising edge */
  
            stm32l4_gpiosetevent(g_gpiointinputs[stm32gpint->stm32gpio.id],
                                 true, false, false, stm32gpio_interrupt,
                                 &g_gpint[stm32gpint->stm32gpio.id]);
          }
      }
    else
      {
        gpioinfo("Disable the interrupt\n");
  
        stm32l4_gpiosetevent(g_gpiointinputs[stm32gpint->stm32gpio.id],
                             false, false, false, NULL, NULL);
      }
  
    return OK;
  }
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32l4_gpio_initialize
   *
   * Description:
   *   Initialize GPIO drivers for use with /apps/examples/gpio
   *
   ****************************************************************************/
  
  int stm32l4_gpio_initialize(void)
  {
    int pincount = 0;
    int i;
  
  #if BOARD_NGPIOIN > 0
    for (i = 0; i < BOARD_NGPIOIN; i++)
      {
        /* Setup and register the GPIO pin */
  
        g_gpin[i].gpio.gp_pintype = GPIO_INPUT_PIN;
        g_gpin[i].gpio.gp_ops     = &gpin_ops;
        g_gpin[i].id              = i;
        gpio_pin_register(&g_gpin[i].gpio, pincount);
  
        /* Configure the pin that will be used as input */
  
        stm32l4_configgpio(g_gpioinputs[i]);
  
        pincount++;
      }
  #endif
  
  #if BOARD_NGPIOOUT > 0
    for (i = 0; i < BOARD_NGPIOOUT; i++)
      {
        /* Setup and register the GPIO pin */
  
        g_gpout[i].gpio.gp_pintype = GPIO_OUTPUT_PIN;
        g_gpout[i].gpio.gp_ops     = &gpout_ops;
        g_gpout[i].id              = i;
        gpio_pin_register(&g_gpout[i].gpio, pincount);
  
        /* Configure the pin that will be used as output */
  
        stm32l4_gpiowrite(g_gpiooutputs[i], 0);
        stm32l4_configgpio(g_gpiooutputs[i]);
  
        pincount++;
      }
  #endif
  
  #if BOARD_NGPIOINT > 0
    for (i = 0; i < BOARD_NGPIOINT; i++)
      {
        /* Setup and register the GPIO pin */
  
        g_gpint[i].stm32gpio.gpio.gp_pintype = GPIO_INTERRUPT_PIN;
        g_gpint[i].stm32gpio.gpio.gp_ops     = &gpint_ops;
        g_gpint[i].stm32gpio.id              = i;
        gpio_pin_register(&g_gpint[i].stm32gpio.gpio, pincount);
  
        /* Configure the pin that will be used as interrupt input */
  
        stm32l4_configgpio(g_gpiointinputs[i]);
  
        pincount++;
      }
  #endif
  
    return 0;
  }
  #endif /* CONFIG_DEV_GPIO && !CONFIG_GPIO_LOWER_HALF */
  