nuttx/boards/risc-v/espressif/esp32h2-generic/src/esp32h2_buttons.c

/****************************************************************************
 * boards/risc-v/espressif/esp32h2-generic/src/esp32h2_buttons.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

/* Config */

#include <nuttx/config.h>

/* Libc */

#include <assert.h>
#include <debug.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>

/* NuttX */

#include <nuttx/arch.h>
#include <nuttx/board.h>
#include <nuttx/irq.h>
#include <arch/irq.h>

/* Arch */

#include "esp_gpio.h"

/* Board */

#include "esp32h2-generic.h"
#include <arch/board/board.h>

/****************************************************************************
 * 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.
 *
 * Input Parameters:
 *   None.
 *
 * Returned Value:
 *   The number of buttons that were initialized.
 *
 ****************************************************************************/

uint32_t board_button_initialize(void)
{
  esp_configgpio(BUTTON_BOOT, INPUT_FUNCTION_3 | PULLUP);
  return 1;
}

/****************************************************************************
 * Name: board_buttons
 *
 * Description:
 *   After board_button_initialize() has been called, board_buttons() may be
 *   called to collect the state of all buttons.
 *
 * Input Parameters:
 *   None.
 *
 * Returned Value:
 *   An 8-bit bit set with each bit associated with a button. See the
 *   BUTTON_*_BIT definitions in board.h for the meaning of each bit.
 *
 ****************************************************************************/

uint32_t board_buttons(void)
{
  uint8_t ret = 0;
  int i = 0;
  int n = 0;

  bool b0 = esp_gpioread(BUTTON_BOOT);

  for (i = 0; i < 10; i++)
    {
      up_mdelay(1); /* TODO */

      bool b1 = esp_gpioread(BUTTON_BOOT);

      if (b0 == b1)
        {
          n++;
        }
      else
        {
          n = 0;
        }

      if (3 == n)
        {
          break;
        }

      b0 = b1;
    }

  iinfo("b=%d n=%d\n", b0, n);

  /* Low value means that the button is pressed */

  if (!b0)
    {
      ret = 0x1;
    }

  return ret;
}

/****************************************************************************
 * Name: board_button_irq
 *
 * Description:
 *   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_* definitions in board.h for the meaning of enumeration
 *   value.
 *
 * Input Parameters:
 *   id         - Identifies the button to be monitored. It is equivalent to
 *                the bit used to report the button state in the return value
 *                from board_buttons().
 *   irqhandler - The handler that will be invoked when the interrupt occurs.
 *   arg        - Pointer to the arguments that will be provided to the
 *                interrupt handler.
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno value on failure.
 *
 ****************************************************************************/

#ifdef CONFIG_ARCH_IRQBUTTONS
int board_button_irq(int id, xcpt_t irqhandler, void *arg)
{
  int ret;
  DEBUGASSERT(id == 0);

  int irq = ESP_PIN2IRQ(BUTTON_BOOT);

  if (NULL != irqhandler)
    {
      /* Make sure the interrupt is disabled */

      esp_gpioirqdisable(irq);

      gpioinfo("Attach %p\n", irqhandler);

      ret = irq_attach(irq, irqhandler, arg);
      if (ret < 0)
        {
          syslog(LOG_ERR, "ERROR: irq_attach() failed: %d\n", ret);
          return ret;
        }

      /* Configure the interrupt for rising and falling edges */

      gpioinfo("Enabling the interrupt\n");
      esp_gpioirqenable(irq, CHANGE);
    }
  else
    {
      gpioinfo("Disable the interrupt\n");
      esp_gpioirqdisable(irq);
    }

  return OK;
}
#endif