jerryscript/targets/mbedos5/jerryscript-mbed/jerryscript-mbed-drivers/source/DigitalOut-js.cpp

/* Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed 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.
 */
#include "jerryscript-mbed-library-registry/wrap_tools.h"
#include "jerryscript-mbed-util/logging.h"
#include "mbed.h"

/**
 * DigitalOut#destructor
 *
 * Called if/when the DigitalOut is GC'ed.
 */
void
NAME_FOR_CLASS_NATIVE_DESTRUCTOR (DigitalOut) (void* void_ptr, jerry_object_native_info_t* info_p)
{
  (void) info_p;
  delete static_cast<DigitalOut*> (void_ptr);
}

/**
 * Type infomation of the native DigitalOut pointer
 *
 * Set DigitalOut#destructor as the free callback.
 */
static const jerry_object_native_info_t native_obj_type_info = { .free_cb =
                                                                   NAME_FOR_CLASS_NATIVE_DESTRUCTOR (DigitalOut) };

/**
 * DigitalOut#write (native JavaScript method)
 *
 * Writes a binary value to a DigitalOut.
 *
 * @param value 1 or 0, specifying whether the output pin is high or low,
 *      respectively
 * @returns undefined, or an error if invalid arguments are provided.
 */
DECLARE_CLASS_FUNCTION (DigitalOut, write)
{
  CHECK_ARGUMENT_COUNT (DigitalOut, write, (args_count == 1));
  CHECK_ARGUMENT_TYPE_ALWAYS (DigitalOut, write, 0, number);

  // Extract native DigitalOut pointer
  void* void_ptr = jerry_object_get_native_ptr (call_info_p->this_value, &native_obj_type_info);

  if (void_ptr == NULL)
  {
    return jerry_throw_sz (JERRY_ERROR_TYPE, "Failed to get native DigitalOut pointer");
  }

  DigitalOut* native_ptr = static_cast<DigitalOut*> (void_ptr);

  int arg0 = jerry_value_as_number (args[0]);
  native_ptr->write (arg0);

  return jerry_undefined ();
}

/**
 * DigitalOut#read (native JavaScript method)
 *
 * Reads the current status of a DigitalOut
 *
 * @returns 1 if the pin is currently high, or 0 if the pin is currently low.
 */
DECLARE_CLASS_FUNCTION (DigitalOut, read)
{
  CHECK_ARGUMENT_COUNT (DigitalOut, read, (args_count == 0));

  // Extract native DigitalOut pointer
  void* void_ptr = jerry_object_get_native_ptr (call_info_p->this_value, &native_obj_type_info);

  if (void_ptr == NULL)
  {
    return jerry_throw_sz (JERRY_ERROR_TYPE, "Failed to get native DigitalOut pointer");
  }

  DigitalOut* native_ptr = static_cast<DigitalOut*> (void_ptr);

  int result = native_ptr->read ();
  return jerry_number (result);
}

/**
 * DigitalOut#is_connected (native JavaScript method)
 *
 * @returns 0 if the DigitalOut is set to NC, or 1 if it is connected to an
 *  actual pin
 */
DECLARE_CLASS_FUNCTION (DigitalOut, is_connected)
{
  CHECK_ARGUMENT_COUNT (DigitalOut, is_connected, (args_count == 0));

  // Extract native DigitalOut pointer
  void* void_ptr = jerry_object_get_native_ptr (call_info_p->this_value, &native_obj_type_info);

  if (void_ptr == NULL)
  {
    return jerry_throw_sz (JERRY_ERROR_TYPE, "Failed to get native DigitalOut pointer");
  }

  DigitalOut* native_ptr = static_cast<DigitalOut*> (void_ptr);

  int result = native_ptr->is_connected ();
  return jerry_number (result);
}

/**
 * DigitalOut (native JavaScript constructor)
 *
 * @param pin_name mbed pin to connect the DigitalOut to.
 * @param value (optional) Initial value of the DigitalOut.
 * @returns a JavaScript object representing a DigitalOut.
 */
DECLARE_CLASS_CONSTRUCTOR (DigitalOut)
{
  CHECK_ARGUMENT_COUNT (DigitalOut, __constructor, (args_count == 1 || args_count == 2));
  CHECK_ARGUMENT_TYPE_ALWAYS (DigitalOut, __constructor, 0, number);
  CHECK_ARGUMENT_TYPE_ON_CONDITION (DigitalOut, __constructor, 1, number, (args_count == 2));

  DigitalOut* native_ptr;

  // Call correct overload of DigitalOut::DigitalOut depending on the
  // arguments passed.
  PinName pin_name = PinName (jerry_value_as_number (args[0]));

  switch (args_count)
  {
    case 1:
      native_ptr = new DigitalOut (pin_name);
      break;
    case 2:
      int value = static_cast<int> (jerry_value_as_number (args[1]));
      native_ptr = new DigitalOut (pin_name, value);
      break;
  }

  // create the jerryscript object
  jerry_value_t js_object = jerry_object ();
  jerry_object_set_native_ptr (js_object, &native_obj_type_info, native_ptr);

  // attach methods
  ATTACH_CLASS_FUNCTION (js_object, DigitalOut, write);
  ATTACH_CLASS_FUNCTION (js_object, DigitalOut, read);
  ATTACH_CLASS_FUNCTION (js_object, DigitalOut, is_connected);

  return js_object;
}