text: /* mbed Microcontroller Library
   * Copyright (c) 2006-2015 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 "gpio_api.h"
  #include "pinmap.h"
  
  // function to enable the GPIO pin
  uint32_t gpio_set(PinName pin) {
      return (1);
  }
  
  //function to initialise the gpio pin
  // this links the board control bits for each pin 
  // with the object created for the pin
  void gpio_init(gpio_t *obj, PinName pin) {
          if(pin == NC){ return;}
          else {
          int pin_value = 0;
          obj->pin = pin;
          if(pin <=15){
              pin_value = pin;
          }else if (pin >= 16 && pin <= 31){
              pin_value = pin-16;
          }else if (pin >= 32 && pin <= 47){
              pin_value = pin-32;
          }else if (pin >= 48 && pin <= 51){
              pin_value = pin-48;
          }else if (pin == 100 || pin == 101){
              pin_value = pin-100;
          }else if (pin == 110 || pin == 111){
              pin_value = pin-110;
          }else if (pin >= 200 && pin <= 207){
              pin_value = pin-200;
          }else if (pin >= 210 && pin <= 217){
              pin_value = pin-210;
          }else if (pin == 303){
              pin_value = pin-302;
          }else if (pin == 307){
              pin_value = pin-307;
          }else if (pin == 308){
              pin_value = pin-305;
          }else if (pin == 309){
              pin_value = pin-305;
          }else if (pin == 310){
              pin_value = pin-305;
          }else if (pin == 311){
              pin_value = pin-305;
          }else if (pin == 323){
              pin_value = pin-315;
          }else if (pin == 334){
              pin_value = pin-325;
          }else if (pin == 653){
              pin_value = pin-646;
          }
          
          obj->mask = 0x1 << pin_value;
          obj->pin_number = pin;
          if(pin <=15) {
              obj->reg_data = &CMSDK_GPIO0->DATAOUT ;
              obj->reg_in  =         &CMSDK_GPIO0->DATA ;
              obj->reg_dir =         &CMSDK_GPIO0->OUTENABLESET ;
              obj->reg_dirclr = &CMSDK_GPIO0->OUTENABLECLR ;
          } else if (pin >= 16 && pin <= 31){
              obj->reg_data = &CMSDK_GPIO1->DATAOUT ;
              obj->reg_in  =         &CMSDK_GPIO1->DATA ;
              obj->reg_dir =         &CMSDK_GPIO1->OUTENABLESET ;
              obj->reg_dirclr = &CMSDK_GPIO1->OUTENABLECLR ;
          } else if (pin >= 32 && pin <= 47){
              obj->reg_data = &CMSDK_GPIO2->DATAOUT;
              obj->reg_in  =         &CMSDK_GPIO2->DATA;
              obj->reg_dir =         &CMSDK_GPIO2->OUTENABLESET ;
              obj->reg_dirclr = &CMSDK_GPIO2->OUTENABLECLR ;
          }    else if (pin >= 48 && pin <= 51){
              obj->reg_data = &CMSDK_GPIO3->DATAOUT;
              obj->reg_in  =         &CMSDK_GPIO3->DATA;
              obj->reg_dir =         &CMSDK_GPIO3->OUTENABLESET ;
              obj->reg_dirclr = &CMSDK_GPIO3->OUTENABLECLR ;
          } else if (pin == 100 || pin == 101){
              obj->reg_data = &MPS2_FPGAIO->LED; //user leds
              obj->reg_in  =  &MPS2_FPGAIO->LED;
          } else if (pin == 110 || pin == 111){
              obj->reg_data = &MPS2_FPGAIO->BUTTON; //user switches
              obj->reg_in = &MPS2_FPGAIO->BUTTON; //user switches
          }else if (pin >= 200 && pin <= 207){
              obj->reg_data = &MPS2_SCC->LEDS; //mcc leds
              obj->reg_in = &MPS2_SCC->LEDS; //mcc leds
          }else if (pin >= 210 && pin <= 217){
              obj->reg_in = &MPS2_SCC->SWITCHES; //mcc switches
          }else if (pin == 303 || pin == 307){
              obj->reg_data = &MPS2_FPGAIO->MISC; //spi chip select = 303, clcd chip select = 307
          }else if (pin == 308 || pin == 309 || pin == 310 || pin == 311){
              obj->reg_data = &MPS2_FPGAIO->MISC; //clcd control bits
          }else if (pin == 323 || pin == 334 || pin == 653){ //spi 3 chip select = 323, spi 4 chip select = 334, adc chip select = 653
              obj->reg_data = &MPS2_FPGAIO->MISC; //spi cs bits
          }
          
          if (pin == 323){
              CMSDK_GPIO0->ALTFUNCSET |= 0x1000;
          }else if (pin == 334){
              CMSDK_GPIO2->ALTFUNCSET |= 0x0040;
          }else if (pin == 653){
              CMSDK_GPIO1->ALTFUNCSET |= 0x0001;
          }
      }
  }
  
  void gpio_mode(gpio_t *obj, PinMode mode) {
          pin_mode(obj->pin, mode);
  }
  
  void gpio_dir(gpio_t *obj, PinDirection direction) {
          if(obj->pin >= 0 && obj->pin <= 51)
              {        
          switch (direction) {
            case PIN_INPUT : *obj->reg_dirclr = obj->mask;  break;
            case PIN_OUTPUT: *obj->reg_dir |= obj->mask; break;
          }
      } else {return;}
  }
  
  int gpio_is_connected(const gpio_t *obj){
      if(obj->pin != (PinName)NC){
          return 1;
      } else {
          return 0;
      }
  }
  
  