text: /* mbed Microcontroller Library
   *******************************************************************************
   * Copyright (c) 2015, STMicroelectronics
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 3. Neither the name of STMicroelectronics nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *******************************************************************************
   */
  #include "mbed_assert.h"
  #include "pinmap.h"
  #include "PortNames.h"
  #include "mbed_error.h"
  
  // GPIO mode look-up table
  // Warning: order must be the same as the one defined in PinNames.h !!!
  static const uint32_t gpio_mode[14] = {
      0x00000000, //  0 = GPIO_MODE_INPUT
      0x00000001, //  1 = GPIO_MODE_OUTPUT_PP
      0x00000011, //  2 = GPIO_MODE_OUTPUT_OD
      0x00000002, //  3 = GPIO_MODE_AF_PP
      0x00000012, //  4 = GPIO_MODE_AF_OD
      0x00000003, //  5 = GPIO_MODE_ANALOG
      0x0000000B, //  6 = GPIO_MODE_ANALOG_ADC_CONTROL
      0x10110000, //  7 = GPIO_MODE_IT_RISING
      0x10210000, //  8 = GPIO_MODE_IT_FALLING
      0x10310000, //  9 = GPIO_MODE_IT_RISING_FALLING
      0x10120000, // 10 = GPIO_MODE_EVT_RISING
      0x10220000, // 11 = GPIO_MODE_EVT_FALLING
      0x10320000, // 12 = GPIO_MODE_EVT_RISING_FALLING
      0x10000000  // 13 = Reset IT and EVT (not in STM32Cube HAL)
  };
  
  // Enable GPIO clock and return GPIO base address
  uint32_t Set_GPIO_Clock(uint32_t port_idx)
  {
      uint32_t gpio_add = 0;
      switch (port_idx) {
          case PortA:
              gpio_add = GPIOA_BASE;
              __HAL_RCC_GPIOA_CLK_ENABLE();
              break;
          case PortB:
              gpio_add = GPIOB_BASE;
              __HAL_RCC_GPIOB_CLK_ENABLE();
              break;
          case PortC:
              gpio_add = GPIOC_BASE;
              __HAL_RCC_GPIOC_CLK_ENABLE();
              break;
  #if defined(GPIOD_BASE)
          case PortD:
              gpio_add = GPIOD_BASE;
              __HAL_RCC_GPIOD_CLK_ENABLE();
              break;
  #endif
  #if defined(GPIOE_BASE)
          case PortE:
              gpio_add = GPIOE_BASE;
              __HAL_RCC_GPIOE_CLK_ENABLE();
              break;
  #endif
          case PortH:
              gpio_add = GPIOH_BASE;
              __HAL_RCC_GPIOH_CLK_ENABLE();
              break;
          default:
              error("Pinmap error: wrong port number\n");
              break;
      }
      return gpio_add;
  }
  
  /**
   * Configure pin (mode, speed, output type and pull-up/pull-down)
   */
  void pin_function(PinName pin, int data)
  {
      MBED_ASSERT(pin != (PinName)NC);
      // Get the pin informations
      uint32_t mode  = STM_PIN_MODE(data);
      uint32_t pupd  = STM_PIN_PUPD(data);
      uint32_t afnum = STM_PIN_AFNUM(data);
  
      uint32_t port_index = STM_PORT(pin);
      uint32_t pin_index  = STM_PIN(pin);
  
      // Enable GPIO clock
      uint32_t gpio_add = Set_GPIO_Clock(port_index);
      GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
  
      // Configure GPIO
      GPIO_InitTypeDef GPIO_InitStructure;
      GPIO_InitStructure.Pin       = (uint32_t)(1 << pin_index);
      GPIO_InitStructure.Mode      = gpio_mode[mode];
      GPIO_InitStructure.Pull      = pupd;
      GPIO_InitStructure.Speed     = GPIO_SPEED_HIGH;
      GPIO_InitStructure.Alternate = afnum;
      HAL_GPIO_Init(gpio, &GPIO_InitStructure);
  
      // [TODO] Disconnect JTAG-DP + SW-DP signals.
      // Warning: Need to reconnect under reset
      //if ((pin == PA_13) || (pin == PA_14)) {
      //
      //}
      //if ((pin == PA_15) || (pin == PB_3) || (pin == PB_4)) {
      //
      //}
  }
  
  /**
   * Configure pin pull-up/pull-down
   */
  void pin_mode(PinName pin, PinMode mode)
  {
      MBED_ASSERT(pin != (PinName)NC);
      uint32_t port_index = STM_PORT(pin);
      uint32_t pin_index  = STM_PIN(pin);
  
      // Enable GPIO clock
      uint32_t gpio_add = Set_GPIO_Clock(port_index);
      GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
  
      // Configure pull-up/pull-down resistors
      uint32_t pupd = (uint32_t)mode;
      if (pupd > 2) {
          pupd = 0; // Open-drain = No pull-up/No pull-down
      }
      gpio->PUPDR &= (uint32_t)(~(GPIO_PUPDR_PUPDR0 << (pin_index * 2)));
      gpio->PUPDR |= (uint32_t)(pupd << (pin_index * 2));
  }
  