nuttx/boards/arm/imxrt/imxrt1020-evk/src/imxrt_gpio.c

/****************************************************************************
 * boards/arm/imxrt/imxrt1020-evk/src/imxrt_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: configs/imxrt1050-evk/src/imxrt_gpio.c
 *
 *   Author:  Pavlina Koleva <pavlinaikoleva19@gmail.com>
 *   Modified by: Ivan Ucherdzhiev <ivanucherdjiev@gmail.com>
 *
 * 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 <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 <imxrt_gpio.h>
#include "imxrt1020-evk.h"

#if defined(CONFIG_DEV_GPIO) && !defined(CONFIG_GPIO_LOWER_HALF)

/****************************************************************************
 * Private Types
 ****************************************************************************/

struct imxrtgpio_dev_s
{
  struct gpio_dev_s gpio;
  uint8_t id;
};

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

#if BOARD_NGPIOIN > 0
static int gpin_read(FAR struct gpio_dev_s *dev, FAR bool *value);
#endif

#if BOARD_NGPIOOUT > 0
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);
#endif

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

 #if BOARD_NGPIOIN > 0
static const struct gpio_operations_s gpin_ops =
{
  .go_read   = gpin_read,
  .go_write  = NULL,
  .go_attach = NULL,
  .go_enable = NULL,
};

/* This array maps the GPIO pins used as INPUT */

static const uint32_t g_gpioinputs[BOARD_NGPIOIN] =
{
  GPIO_IN1,
};

static struct imxrtgpio_dev_s g_gpin[BOARD_NGPIOIN];
#endif

#if BOARD_NGPIOOUT > 0

static const struct gpio_operations_s gpout_ops =
{
  .go_read   = gpout_read,
  .go_write  = gpout_write,
  .go_attach = NULL,
  .go_enable = NULL,
};

/* This array maps the GPIO pins used as OUTPUT */

static const uint32_t g_gpiooutputs[BOARD_NGPIOOUT] =
{
  GPIO_GOUT1,
  GPIO_GOUT2,
  GPIO_GOUT3,
  GPIO_GOUT4,
};

static struct imxrtgpio_dev_s g_gpout[BOARD_NGPIOOUT];
#endif

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

#if BOARD_NGPIOIN > 0
static int gpin_read(FAR struct gpio_dev_s *dev, FAR bool *value)
{
  FAR struct imxrtgpio_dev_s *imxrtgpio = (FAR struct imxrtgpio_dev_s *)dev;

  DEBUGASSERT(imxrtgpio != NULL && value != NULL);
  DEBUGASSERT(imxrtgpio->id < BOARD_NGPIOIN);
  gpioinfo("Reading...\n");

  *value = imxrt_gpio_read(g_gpioinputs[imxrtgpio->id]);
  return OK;
}
#endif

#if BOARD_NGPIOOUT > 0
static int gpout_read(FAR struct gpio_dev_s *dev, FAR bool *value)
{
  FAR struct imxrtgpio_dev_s *imxrtgpio = (FAR struct imxrtgpio_dev_s *)dev;

  DEBUGASSERT(imxrtgpio != NULL && value != NULL);
  DEBUGASSERT(imxrtgpio->id < BOARD_NGPIOOUT);
  gpioinfo("Reading...\n");

  *value = imxrt_gpio_read(g_gpiooutputs[imxrtgpio->id]);
  return OK;
}

static int gpout_write(FAR struct gpio_dev_s *dev, bool value)
{
  FAR struct imxrtgpio_dev_s *imxrtgpio = (FAR struct imxrtgpio_dev_s *)dev;

  DEBUGASSERT(imxrtgpio != NULL);
  DEBUGASSERT(imxrtgpio->id < BOARD_NGPIOOUT);
  gpioinfo("Writing %d\n", (int)value);

  imxrt_gpio_write(g_gpiooutputs[imxrtgpio->id], value);
  return OK;
}
#endif

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

/****************************************************************************
 * Name: imxrt_gpio_initialize
 *
 * Description:
 *   Initialize GPIO drivers for use with /apps/examples/gpio
 *
 ****************************************************************************/

int imxrt_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;

      (void)gpio_pin_register(&g_gpin[i].gpio, pincount);

      /* Configure the pin that will be used as input */

      imxrt_config_gpio(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;

      (void)gpio_pin_register(&g_gpout[i].gpio, pincount);

      /* Configure the pin that will be used as output */

      imxrt_gpio_write(g_gpiooutputs[i], 0);
      imxrt_config_gpio(g_gpiooutputs[i]);

      pincount++;
    }
#endif

  return 0;
}
#endif /* CONFIG_DEV_GPIO && !CONFIG_GPIO_LOWER_HALF */