text: /* mbed Microcontroller Library
   * Copyright (c) 2006-2013 ARM Limited
   *
   * 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 "mbed_assert.h"
  #include "pinmap.h"
  #include "mbed_error.h"
  #include "fsl_common.h"
  
  void pin_function(PinName pin, int function)
  {
      MBED_ASSERT(pin != (PinName)NC);
      clock_ip_name_t gpio_clocks[] = GPIO_CLOCKS;
      uint32_t pin_number = pin & 0x1F;
      uint8_t port_number = pin / 32;
      uint32_t reg;
  
      CLOCK_EnableClock(gpio_clocks[port_number]);
      CLOCK_EnableClock(kCLOCK_Iocon);
  
      /* Set the DIGIMODE bit */
      IOCON->PIO[port_number][pin_number] |= IOCON_PIO_DIGIMODE_MASK;
  
      reg = IOCON->PIO[port_number][pin_number];
      reg = (reg & ~0x7) | (function & IOCON_PIO_FUNC_MASK);
      IOCON->PIO[port_number][pin_number] = reg;
  }
  
  void pin_mode(PinName pin, PinMode mode)
  {
      MBED_ASSERT(pin != (PinName)NC);
      uint32_t pin_number = pin & 0x1F;
      uint8_t port_number = pin / 32;
      uint32_t reg = IOCON->PIO[port_number][pin_number] & ~IOCON_PIO_MODE_MASK;
  
      switch (mode) {
          case PullNone:
              break;
          case PullDown:
              reg |= (1 << IOCON_PIO_MODE_SHIFT);
              break;
          case PullUp:
              reg |= (2 << IOCON_PIO_MODE_SHIFT);
              break;
          default:
              break;
      }
  
      IOCON->PIO[port_number][pin_number] = reg;
  }
  