/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : stm32f10x_gpio.c
* Author             : MCD Application Team
* Date First Issued  : 09/29/2006
* Description        : This file provides all the GPIO firmware functions.
********************************************************************************
* History:
* 02/05/2007: V0.1
* 09/29/2006: V0.01
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* ------------ RCC registers bit address in the alias region ----------- */
#define AFIO_OFFSET                 (AFIO_BASE - PERIPH_BASE)

/* --- EVENTCR Register ---*/
/* Alias word address of EVOE bit */
#define EVCR_OFFSET                 (AFIO_OFFSET + 0x00)
#define EVOE_BitNumber              ((u8)0x07)
#define EVCR_EVOE_BB                (PERIPH_BB_BASE + (EVCR_OFFSET * 32) + (EVOE_BitNumber * 4))


#define EVCR_PORTPINCONFIG_MASK     ((u16)0xFF80)
#define LSB_MASK                    ((u16)0xFFFF)
#define DBGAFR_POSITION_MASK        ((u32)0x000F0000)
#define DBGAFR_SWJCFG_MASK          ((u32)0xF8FFFFFF)
#define DBGAFR_LOCATION_MASK        ((u32)0x00200000)
#define DBGAFR_NUMBITS_MASK         ((u32)0x00100000)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name  : GPIO_DeInit
* Description    : Deinitializes the GPIOx peripheral registers to their default
*                  reset values.
* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_DeInit(GPIO_TypeDef* GPIOx)
{
  switch (*(u32*)&GPIOx)
  {
    case GPIOA_BASE:
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, DISABLE);
      break;

    case GPIOB_BASE:
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, DISABLE);
      break;

    case GPIOC_BASE:
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOC, ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOC, DISABLE);
      break;

    case GPIOD_BASE:
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOD, ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOD, DISABLE);
      break;
      
    case GPIOE_BASE:
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOE, ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOE, DISABLE);
      break;            

    default:
      break;
  }
}

/*******************************************************************************
* Function Name  : GPIO_AFIODeInit
* Description    : Deinitializes the Alternate Functions (remap, event control
*                  and EXTI configuration) registers to their default reset
*                  values.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_AFIODeInit(void)
{
  RCC_APB2PeriphResetCmd(RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB2PeriphResetCmd(RCC_APB2Periph_AFIO, DISABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Init
* Description    : Initializes the GPIOx peripheral according to the specified
*                  parameters in the GPIO_InitStruct.
* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.
*                  - GPIO_InitStruct: pointer to a GPIO_InitTypeDef structure that
*                    contains the configuration information for the specified GPIO
*                    peripheral.
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)
{
  u32 currentmode = 0, currentpin = 0, pinpos = 0, pos = 0;
  u32 tmpreg = 0, pinmask = 0;

  /*---------------------------- GPIO Mode Configuration -----------------------*/
  currentmode = GPIO_InitStruct->GPIO_Mode & 0x0F;

  if (((GPIO_InitStruct->GPIO_Mode) & 0x10) != 0x00)
  { /* Output mode */
    currentmode |= GPIO_InitStruct->GPIO_Speed;
  }

  /*---------------------------- GPIO CRL Configuration ------------------------*/
  /* Configure the eight low port pins */
  if ((GPIO_InitStruct->GPIO_Pin & 0x00FF) != 0x00)
  {
    tmpreg = GPIOx->CRL;

    for (pinpos = 0; pinpos < 0x08; pinpos++)
    {
      pos = 1 << pinpos;
      /* Get the port pins position */
      currentpin = (GPIO_InitStruct->GPIO_Pin) & pos;

      if (currentpin == pos)
      {
        pos = pinpos << 2;
        /* Clear the corresponding low control register bits */
        pinmask = 0x0F << pos;
        tmpreg &= ~pinmask;

        /* Write the mode configuration in the corresponding bits */
        tmpreg |= (currentmode << pos);

        /* Reset the corresponding ODR bit */
        if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPD)
        {
          GPIOx->BRR = (1 << pinpos);
        }
        /* Set the corresponding ODR bit */
        if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
        {
          GPIOx->BSRR = (1 << pinpos);
        }
      }
    }
    GPIOx->CRL = tmpreg;
    tmpreg = 0;
  }

  /*---------------------------- GPIO CRH Configuration ------------------------*/
  /* Configure the eight high port pins */
  if (GPIO_InitStruct->GPIO_Pin > 0x00FF)
  {
    tmpreg = GPIOx->CRH;
    for (pinpos = 0; pinpos < 0x08; pinpos++)
    {
      pos = (1 << (pinpos + 8));
      /* Get the port pins position */
      currentpin = ((GPIO_InitStruct->GPIO_Pin) & pos);
      if (currentpin == pos)
      {
        pos = pinpos << 2;
        /* Clear the corresponding high control register bits */
        pinmask = 0x0F << pos;
        tmpreg &= ~pinmask;

        /* Write the mode configuration in the corresponding bits */
        tmpreg |= (currentmode << pos);

        /* Reset the corresponding ODR bit */
        if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPD)
        {
          GPIOx->BRR = (1 << (pinpos + 8));
        }
        /* Set the corresponding ODR bit */
        if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
        {
          GPIOx->BSRR = (1 << (pinpos + 8));
        }
      }
    }
    GPIOx->CRH = tmpreg;
  }
}

/*******************************************************************************
* Function Name  : GPIO_StructInit
* Description    : Fills each GPIO_InitStruct member with its default value.
* Input          : - GPIO_InitStruct : pointer to a GPIO_InitTypeDef structure
*                    which will be initialized.
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_StructInit(GPIO_InitTypeDef* GPIO_InitStruct)
{
  /* Reset GPIO init structure parameters values */
  GPIO_InitStruct->GPIO_Pin  = GPIO_Pin_All;
  GPIO_InitStruct->GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IN_FLOATING;
}

/*******************************************************************************
* Function Name  : GPIO_ReadInputDataBit
* Description    : Reads the specified input port pin.
* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.
*                : - GPIO_Pin:  specifies the port bit to read.
*                    This parameter can be GPIO_Pin_x where x can be (0..15).
* Output         : None
* Return         : The input port pin value.
*******************************************************************************/
u8 GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, u16 GPIO_Pin)
{
  u8 bitstatus = 0;

  if ((GPIOx->IDR & GPIO_Pin) != Bit_RESET)
  {
    bitstatus = Bit_SET;
  }
  else
  {
    bitstatus = Bit_RESET;
  }
  return bitstatus;
}