text: /* mbed Microcontroller Library
   * Copyright (c) 2006-2020 ARM Limited
   * SPDX-License-Identifier: Apache-2.0
   *
   * 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 "port_api.h"
  #include "pinmap.h"
  #include "gpio_api.h"
  
  PinName port_pin(PortName port, int pin_n) {
      return (PinName)((port << PORT_SHIFT) | pin_n);
  }
  
  void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
      obj->port = port;
      obj->mask = mask;
      
      LPC_GPIO->MASK[port] = ~mask;
      
      obj->reg_mpin = &LPC_GPIO->MPIN[port];
      obj->reg_dir = &LPC_GPIO->DIR[port];
      
      uint32_t i;
      // The function is set per pin: reuse gpio logic
      for (i=0; i<32; i++) {
          if (obj->mask & (1<<i)) {
              gpio_set(port_pin(obj->port, i));
          }
      }
      
      port_dir(obj, dir);
  }
  
  void port_mode(port_t *obj, PinMode mode) {
      uint32_t i;
      // The mode is set per pin: reuse pinmap logic
      for (i=0; i<32; i++) {
          if (obj->mask & (1<<i)) {
              pin_mode(port_pin(obj->port, i), mode);
          }
      }
  }
  
  void port_dir(port_t *obj, PinDirection dir) {
      switch (dir) {
          case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
          case PIN_OUTPUT: *obj->reg_dir |=  obj->mask; break;
      }
  }
  
  void port_write(port_t *obj, int value) {
      *obj->reg_mpin = value;
  }
  
  int port_read(port_t *obj) {
      return (*obj->reg_mpin);
  }
  