stm32f10x_gpio.c

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/**
  ******************************************************************************
  * @file  stm32f10x_gpio.c
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  This file provides all the GPIO firmware functions.
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  */ 

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

/** @addtogroup StdPeriph_Driver
  * @{
  */

/** @defgroup GPIO 
  * @brief GPIO driver modules
  * @{
  */ 

/** @defgroup GPIO_Private_TypesDefinitions
  * @{
  */

/**
  * @}
  */

/** @defgroup GPIO_Private_Defines
  * @{
  */

/* ------------ 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              ((uint8_t)0x07)
#define EVCR_EVOE_BB                (PERIPH_BB_BASE + (EVCR_OFFSET * 32) + (EVOE_BitNumber * 4))
#define EVCR_PORTPINCONFIG_MASK     ((uint16_t)0xFF80)
#define LSB_MASK                    ((uint16_t)0xFFFF)
#define DBGAFR_POSITION_MASK        ((uint32_t)0x000F0000)
#define DBGAFR_SWJCFG_MASK          ((uint32_t)0xF0FFFFFF)
#define DBGAFR_LOCATION_MASK        ((uint32_t)0x00200000)
#define DBGAFR_NUMBITS_MASK         ((uint32_t)0x00100000)

/**
  * @}
  */

/** @defgroup GPIO_Private_Macros
  * @{
  */

/**
  * @}
  */

/** @defgroup GPIO_Private_Variables
  * @{
  */

/**
  * @}
  */

/** @defgroup GPIO_Private_FunctionPrototypes
  * @{
  */

/**
  * @}
  */

/** @defgroup GPIO_Private_Functions
  * @{
  */

/**
  * @brief  Deinitializes the GPIOx peripheral registers to their default
  *   reset values.
  * @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
  * @retval : None
  */
void GPIO_DeInit(GPIO_TypeDef* GPIOx)
{
  /* Check the parameters */
  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  
  switch (*(uint32_t*)&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; 
    case GPIOF_BASE:
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOF, ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOF, DISABLE);
      break;
    case GPIOG_BASE:
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOG, ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOG, DISABLE);
      break;
    default:
      break;
  }
}

/**
  * @brief  Deinitializes the Alternate Functions (remap, event control
  *   and EXTI configuration) registers to their default reset
  *   values.
  * @param  None
  * @retval : None
  */
void GPIO_AFIODeInit(void)
{
  RCC_APB2PeriphResetCmd(RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB2PeriphResetCmd(RCC_APB2Periph_AFIO, DISABLE);
}

/**
  * @brief  Initializes the GPIOx peripheral according to the specified
  *   parameters in the GPIO_InitStruct.
  * @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
  * @param GPIO_InitStruct: pointer to a GPIO_InitTypeDef structure that
  *   contains the configuration information for the specified GPIO
  *   peripheral.
  * @retval : None
  */
void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)
{
  uint32_t currentmode = 0x00, currentpin = 0x00, pinpos = 0x00, pos = 0x00;
  uint32_t tmpreg = 0x00, pinmask = 0x00;
  /* Check the parameters */
  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  assert_param(IS_GPIO_MODE(GPIO_InitStruct->GPIO_Mode));
  assert_param(IS_GPIO_PIN(GPIO_InitStruct->GPIO_Pin));  
  
/*---------------------------- GPIO Mode Configuration -----------------------*/
  currentmode = ((uint32_t)GPIO_InitStruct->GPIO_Mode) & ((uint32_t)0x0F);
  if ((((uint32_t)GPIO_InitStruct->GPIO_Mode) & ((uint32_t)0x10)) != 0x00)
  { 
    /* Check the parameters */
    assert_param(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));
    /* Output mode */
    currentmode |= (uint32_t)GPIO_InitStruct->GPIO_Speed;
  }
/*---------------------------- GPIO CRL Configuration ------------------------*/
  /* Configure the eight low port pins */
  if (((uint32_t)GPIO_InitStruct->GPIO_Pin & ((uint32_t)0x00FF)) != 0x00)
  {
    tmpreg = GPIOx->CRL;
    for (pinpos = 0x00; pinpos < 0x08; pinpos++)
    {
      pos = ((uint32_t)0x01) << 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 = ((uint32_t)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 = (((uint32_t)0x01) << pinpos);
        }
        else
        {
          /* Set the corresponding ODR bit */
          if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
          {
            GPIOx->BSRR = (((uint32_t)0x01) << pinpos);
          }
        }
      }
    }
    GPIOx->CRL = tmpreg;
  }
/*---------------------------- GPIO CRH Configuration ------------------------*/
  /* Configure the eight high port pins */
  if (GPIO_InitStruct->GPIO_Pin > 0x00FF)
  {
    tmpreg = GPIOx->CRH;
    for (pinpos = 0x00; pinpos < 0x08; pinpos++)
    {
      pos = (((uint32_t)0x01) << (pinpos + 0x08));
      /* 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 = ((uint32_t)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 = (((uint32_t)0x01) << (pinpos + 0x08));
        }
        /* Set the corresponding ODR bit */
        if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
        {
          GPIOx->BSRR = (((uint32_t)0x01) << (pinpos + 0x08));
        }
      }
    }
    GPIOx->CRH = tmpreg;
  }
}

/**
  * @brief  Fills each GPIO_InitStruct member with its default value.
  * @param GPIO_InitStruct : pointer to a GPIO_InitTypeDef structure
  *   which will be initialized.
  * @retval : 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;
}

/**
  * @brief  Reads the specified input port pin.
  * @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
  * @param GPIO_Pin:  specifies the port bit to read.
  *   This parameter can be GPIO_Pin_x where x can be (0..15).
  * @retval : The input port pin value.
  */
uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
  uint8_t bitstatus = 0x00;
  
  /* Check the parameters */
  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  assert_param(IS_GET_GPIO_PIN(GPIO_Pin)); 
  
  if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)Bit_RESET)
  {
    bitstatus = (uint8_t)Bit_SET;
  }
  else
  {
    bitstatus = (uint8_t)Bit_RESET;
  }
  return bitstatus;
}

/**
  * @brief  Reads the specified GPIO input data port.
  * @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
  * @retval : GPIO input data port value.
  */