Subversion Repositories openrisc

/******************** (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:

* 04/02/2007: V0.2

* 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 = 0x00, currentpin = 0x00, pinpos = 0x00, pos = 0x00;

  u32 tmpreg = 0x00, pinmask = 0x00;

  /* Check the parameters */

  assert(IS_GPIO_MODE(GPIO_InitStruct->GPIO_Mode));

  assert(IS_GPIO_PIN(GPIO_InitStruct->GPIO_Pin));

/*---------------------------- GPIO Mode Configuration -----------------------*/

  currentmode = ((u32)GPIO_InitStruct->GPIO_Mode) & ((u32)0x0F);

  if ((((u32)GPIO_InitStruct->GPIO_Mode) & ((u32)0x10)) != 0x00)

  {

    /* Check the parameters */

    assert(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));

    /* Output mode */

    currentmode |= (u32)GPIO_InitStruct->GPIO_Speed;

  }

/*---------------------------- GPIO CRL Configuration ------------------------*/

  /* Configure the eight low port pins */

  if (((u32)GPIO_InitStruct->GPIO_Pin & ((u32)0x00FF)) != 0x00)

  {

    tmpreg = GPIOx->CRL;

    for (pinpos = 0x00; pinpos < 0x08; pinpos++)

    {

      pos = ((u32)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 = ((u32)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 = (((u32)0x01) << pinpos);

        }

        /* Set the corresponding ODR bit */

        if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)

        {

          GPIOx->BSRR = (((u32)0x01) << 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 = 0x00; pinpos < 0x08; pinpos++)

    {

      pos = (((u32)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 = ((u32)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 = (((u32)0x01) << (pinpos + 0x08));

        }

        /* Set the corresponding ODR bit */

        if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)

        {

          GPIOx->BSRR = (((u32)0x01) << (pinpos + 0x08));

        }

      }

    }

    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 = 0x00;

  /* Check the parameters */

  assert(IS_GPIO_PIN(GPIO_Pin));

  if ((GPIOx->IDR & GPIO_Pin) != (u32)Bit_RESET)

  {

    bitstatus = (u8)Bit_SET;

  }

  else

  {

    bitstatus = (u8)Bit_RESET;

  }

  return bitstatus;

}

/*******************************************************************************

* Function Name  : GPIO_ReadInputData

* Description    : Reads the specified GPIO input data port.

* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.

* Output         : None

* Return         : GPIO input data port value.

*******************************************************************************/

u16 GPIO_ReadInputData(GPIO_TypeDef* GPIOx)

{

  return ((u16)GPIOx->IDR);

}

/*******************************************************************************

* Function Name  : GPIO_ReadOutputDataBit

* Description    : Reads the specified output data port bit.

* 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 output port pin value.

*******************************************************************************/

u8 GPIO_ReadOutputDataBit(GPIO_TypeDef* GPIOx, u16 GPIO_Pin)

{

  u8 bitstatus = 0x00;

  /* Check the parameters */

  assert(IS_GPIO_PIN(GPIO_Pin));

  if ((GPIOx->ODR & GPIO_Pin) != (u32)Bit_RESET)

  {

    bitstatus = (u8)Bit_SET;

  }

  else

  {

    bitstatus = (u8)Bit_RESET;

  }

  return bitstatus;

}

/*******************************************************************************

* Function Name  : GPIO_ReadOutputData

* Description    : Reads the specified GPIO output data port.

* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.

* Output         : None

* Return         : GPIO output data port value.

*******************************************************************************/

u16 GPIO_ReadOutputData(GPIO_TypeDef* GPIOx)

{

  return ((u16)GPIOx->ODR);

}

/*******************************************************************************

* Function Name  : GPIO_WriteBit

* Description    : Sets or clears the selected data port bit.

* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.

*                  - GPIO_Pin: specifies the port bit to be written.

*                    This parameter can be GPIO_Pin_x where x can be (0..15).

*                  - BitVal: specifies the value to be written to the selected bit.

*                    This parameter can be one of the BitAction enum values:

*                       - Bit_RESET: to clear the port pin

*                       - Bit_SET: to set the port pin

* Output         : None

* Return         : None

*******************************************************************************/

void GPIO_WriteBit(GPIO_TypeDef* GPIOx, u16 GPIO_Pin, BitAction BitVal)

{

  /* Check the parameters */

  assert(IS_GPIO_PIN(GPIO_Pin));

  assert(IS_GPIO_BIT_ACTION(BitVal));

  if (BitVal != Bit_RESET)

  {

    GPIOx->BSRR = GPIO_Pin;

  }

  else

  {

    GPIOx->BRR = GPIO_Pin;

  }

}

/*******************************************************************************

* Function Name  : GPIO_Write

* Description    : Writes data to the specified GPIO data port.

* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.

*                  - PortVal: specifies the value to be written to the port output

*                    data register.

* Output         : None

* Return         : None

*******************************************************************************/

void GPIO_Write(GPIO_TypeDef* GPIOx, u16 PortVal)

{

  GPIOx->ODR = PortVal;

}

/*******************************************************************************

* Function Name  : GPIO_PinLockConfig

* Description    : Locks GPIO Pins configuration registers.

* Input          : - GPIOx: where x can be (A..E) to select the GPIO peripheral.

*                  - GPIO_Pin: specifies the port bit to be written.

*                    This parameter can be GPIO_Pin_x where x can be (0..15).

* Output         : None

* Return         : None

*******************************************************************************/

void GPIO_PinLockConfig(GPIO_TypeDef* GPIOx, u16 GPIO_Pin)

{

  u32 tmp = 0x00010000;

  /* Check the parameters */

  assert(IS_GPIO_PIN(GPIO_Pin));

  tmp |= GPIO_Pin;

  /* Set LCKK bit */

  GPIOx->LCKR = tmp;

  /* Reset LCKK bit */

  GPIOx->LCKR =  GPIO_Pin;

  /* Set LCKK bit */

  GPIOx->LCKR = tmp;

  /* Read LCKK bit*/

  tmp = GPIOx->LCKR;

  /* Read LCKK bit*/

  tmp = GPIOx->LCKR;

}

/*******************************************************************************

* Function Name  : GPIO_EventOutputConfig

* Description    : Selects the GPIO pin used as Event output.

* Input          : - GPIO_PortSource: selects the GPIO port to be used as source

*                    for Event output.

*                    This parameter can be GPIO_PortSourceGPIOx where x can be

*                    (A..E).

*                  - GPIO_PinSource: specifies the pin for the Event output.

*                    This parameter can be GPIO_PinSourcex where x can be (0..15).

* Output         : None

* Return         : None

*******************************************************************************/

void GPIO_EventOutputConfig(u8 GPIO_PortSource, u8 GPIO_PinSource)

{

  u32 tmpreg = 0x00;

  /* Check the parameters */

  assert(IS_GPIO_PORT_SOURCE(GPIO_PortSource));

  assert(IS_GPIO_PIN_SOURCE(GPIO_PinSource));

  tmpreg = AFIO->EVCR;

  /* Clear the PORT[6:4] and PIN[3:0] bits */

  tmpreg &= EVCR_PORTPINCONFIG_MASK;

  tmpreg |= (u32)GPIO_PortSource << 0x04;

  tmpreg |= GPIO_PinSource;

  AFIO->EVCR = tmpreg;

}

/*******************************************************************************

* Function Name  : GPIO_EventOutputCmd

* Description    : Enables or disables the Event Output.

* Input          : - NewState: new state of the Event output.

*                    This parameter can be: ENABLE or DISABLE.

* Output         : None

* Return         : None

*******************************************************************************/

void GPIO_EventOutputCmd(FunctionalState NewState)

{

  /* Check the parameters */

  assert(IS_FUNCTIONAL_STATE(NewState));

  *(vu32 *) EVCR_EVOE_BB = (u32)NewState;

}

/*******************************************************************************

* Function Name  : GPIO_PinRemapConfig

* Description    : Changes the mapping of the specified pin.

* Input          : - GPIO_Remap: selects the pin to remap.

*                    This parameter can be one of the following values:

*                       - GPIO_Remap_SPI1

*                       - GPIO_Remap_I2C1

*                       - GPIO_Remap_USART1

*                       - GPIO_Remap_USART2

*                       - GPIO_PartialRemap_USART3

*                       - GPIO_FullRemap_USART3

*                       - GPIO_PartialRemap_TIM1

*                       - GPIO_FullRemap_TIM1

*                       - GPIO_PartialRemap1_TIM2

*                       - GPIO_PartialRemap2_TIM2

*                       - GPIO_FullRemap_TIM2

*                       - GPIO_PartialRemap_TIM3

*                       - GPIO_FullRemap_TIM3

*                       - GPIO_Remap_TIM4

*                       - GPIO_Remap1_CAN

*                       - GPIO_Remap2_CAN

*                       - GPIO_Remap_PD01

*                       - GPIO_Remap_SWJ_NoJTRST

*                       - GPIO_Remap_SWJ_JTAGDisable

*                       - GPIO_Remap_SWJ_Disable

*                  - NewState: new state of the port pin remapping.

*                    This parameter can be: ENABLE or DISABLE.

* Output         : None

* Return         : None

*******************************************************************************/

void GPIO_PinRemapConfig(u32 GPIO_Remap, FunctionalState NewState)

{

  u32 tmp = 0x00, tmp1 = 0x00, tmpreg = 0x00, tmpmask = 0x00;

  /* Check the parameters */

  assert(IS_GPIO_REMAP(GPIO_Remap));

  assert(IS_FUNCTIONAL_STATE(NewState));

  tmpreg = AFIO->MAPR;

  tmpmask = (GPIO_Remap & DBGAFR_POSITION_MASK) >> 0x10;

  tmp = GPIO_Remap & LSB_MASK;

  if ((GPIO_Remap & DBGAFR_LOCATION_MASK) == DBGAFR_LOCATION_MASK)

  {

    tmpreg &= DBGAFR_SWJCFG_MASK;

  }

  else if ((GPIO_Remap & DBGAFR_NUMBITS_MASK) == DBGAFR_NUMBITS_MASK)

  {

    tmp1 = ((u32)0x03) << tmpmask;

    tmpreg &= ~tmp1;

  }

  else

  {

    tmpreg &= ~tmp;

  }

  if (NewState != DISABLE)

  {

    if ((GPIO_Remap & DBGAFR_LOCATION_MASK) == DBGAFR_LOCATION_MASK)

    {

      tmpreg |= (tmp << 0x10);

    }

    else

    {

      tmpreg |= tmp;

    }

  }

  AFIO->MAPR = tmpreg;

}

/*******************************************************************************

* Function Name  : GPIO_EXTILineConfig

* Description    : Selects the GPIO pin used as EXTI Line.

* Input          : - GPIO_PortSource: selects the GPIO port to be used as

*                    source for EXTI lines.

*                  - GPIO_PinSource: specifies the EXTI line to be configured.

*                   This parameter can be GPIO_PinSourcex where x can be (0..15).

* Output         : None

* Return         : None

*******************************************************************************/

void GPIO_EXTILineConfig(u8 GPIO_PortSource, u8 GPIO_PinSource)

{

  u32 tmp = 0x00;

  /* Check the parameters */

  assert(IS_GPIO_PORT_SOURCE(GPIO_PortSource));

  assert(IS_GPIO_PIN_SOURCE(GPIO_PinSource));

  tmp = ((u32)0x0F) << (0x04 * (GPIO_PinSource & (u8)0x03));

  AFIO->EXTICR[GPIO_PinSource >> 0x02] &= ~tmp;

  AFIO->EXTICR[GPIO_PinSource >> 0x02] |= (((u32)GPIO_PortSource) << (0x04 * (GPIO_PinSource & (u8)0x03)));

}

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/