AMiRo-OS

/**

  ******************************************************************************

  * @file    stm32f4xx_gpio.c

  * @author  MCD Application Team

  * @version V1.1.0

  * @date    11-January-2013

  * @brief   This file provides firmware functions to manage the following 

  *          functionalities of the GPIO peripheral:           

  *           + Initialization and Configuration

  *           + GPIO Read and Write

  *           + GPIO Alternate functions configuration

  * 

@verbatim  

 ===============================================================================

                      ##### How to use this driver #####

 ===============================================================================       

 [..]             

   (#) Enable the GPIO AHB clock using the following function

       RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOx, ENABLE);

   (#) Configure the GPIO pin(s) using GPIO_Init()

       Four possible configuration are available for each pin:

       (++) Input: Floating, Pull-up, Pull-down.

       (++) Output: Push-Pull (Pull-up, Pull-down or no Pull)

            Open Drain (Pull-up, Pull-down or no Pull). In output mode, the speed 

            is configurable: 2 MHz, 25 MHz, 50 MHz or 100 MHz.

       (++) Alternate Function: Push-Pull (Pull-up, Pull-down or no Pull) Open 

            Drain (Pull-up, Pull-down or no Pull).

       (++) Analog: required mode when a pin is to be used as ADC channel or DAC 

            output.

   (#) Peripherals alternate function:

       (++) For ADC and DAC, configure the desired pin in analog mode using 

            GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AN;

            (+++) For other peripherals (TIM, USART...):

            (+++) Connect the pin to the desired peripherals' Alternate 

                     Function (AF) using GPIO_PinAFConfig() function

            (+++) Configure the desired pin in alternate function mode using

                     GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF

            (+++) Select the type, pull-up/pull-down and output speed via 

                     GPIO_PuPd, GPIO_OType and GPIO_Speed members

            (+++) Call GPIO_Init() function

   (#) To get the level of a pin configured in input mode use GPIO_ReadInputDataBit()

   (#) To set/reset the level of a pin configured in output mode use 

       GPIO_SetBits()/GPIO_ResetBits()

   (#) During and just after reset, the alternate functions are not 

       active and the GPIO pins are configured in input floating mode (except JTAG

       pins).

   (#) The LSE oscillator pins OSC32_IN and OSC32_OUT can be used as general purpose 

       (PC14 and PC15, respectively) when the LSE oscillator is off. The LSE has 

       priority over the GPIO function.

   (#) The HSE oscillator pins OSC_IN/OSC_OUT can be used as 

       general purpose PH0 and PH1, respectively, when the HSE oscillator is off. 

       The HSE has priority over the GPIO function.

@endverbatim        

  *

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>

  *

  * Licensed under MCD-ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2

  *

  * 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.

  *

  ******************************************************************************

  */

/* Includes ------------------------------------------------------------------*/

#include "stm32f4xx_gpio.h"

#include "stm32f4xx_rcc.h"

/** @addtogroup STM32F4xx_StdPeriph_Driver

  * @{

  */

/** @defgroup GPIO 

  * @brief GPIO driver modules

  * @{

  */ 

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/** @defgroup GPIO_Private_Functions

  * @{

  */ 

/** @defgroup GPIO_Group1 Initialization and Configuration

 *  @brief   Initialization and Configuration

 *

@verbatim   

 ===============================================================================

                 ##### Initialization and Configuration #####

 ===============================================================================  

@endverbatim

  * @{

  */

/**

  * @brief  De-initializes the GPIOx peripheral registers to their default reset values.

  * @note   By default, The GPIO pins are configured in input floating mode (except JTAG pins).

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices. 

  * @retval None

  */

void GPIO_DeInit(GPIO_TypeDef* GPIOx)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  if (GPIOx == GPIOA)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, DISABLE);

  }

  else if (GPIOx == GPIOB)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOB, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOB, DISABLE);

  }

  else if (GPIOx == GPIOC)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOC, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOC, DISABLE);

  }

  else if (GPIOx == GPIOD)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOD, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOD, DISABLE);

  }

  else if (GPIOx == GPIOE)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOE, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOE, DISABLE);

  }

  else if (GPIOx == GPIOF)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOF, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOF, DISABLE);

  }

  else if (GPIOx == GPIOG)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOG, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOG, DISABLE);

  }

  else if (GPIOx == GPIOH)

  {

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOH, ENABLE);

    RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOH, DISABLE);

  }

  else

  {

    if (GPIOx == GPIOI)

    {

      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOI, ENABLE);

      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOI, DISABLE);

    }

  }

}

/**

  * @brief  Initializes the GPIOx peripheral according to the specified parameters in the GPIO_InitStruct.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices. 

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

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  assert_param(IS_GPIO_PIN(GPIO_InitStruct->GPIO_Pin));

  assert_param(IS_GPIO_MODE(GPIO_InitStruct->GPIO_Mode));

  assert_param(IS_GPIO_PUPD(GPIO_InitStruct->GPIO_PuPd));

  /* ------------------------- Configure the port pins ---------------- */

  /*-- GPIO Mode Configuration --*/

  for (pinpos = 0x00; pinpos < 0x10; pinpos++)

  {

    pos = ((uint32_t)0x01) << pinpos;

    /* Get the port pins position */

    currentpin = (GPIO_InitStruct->GPIO_Pin) & pos;

    if (currentpin == pos)

    {

      GPIOx->MODER  &= ~(GPIO_MODER_MODER0 << (pinpos * 2));

      GPIOx->MODER |= (((uint32_t)GPIO_InitStruct->GPIO_Mode) << (pinpos * 2));

      if ((GPIO_InitStruct->GPIO_Mode == GPIO_Mode_OUT) || (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_AF))

      {

        /* Check Speed mode parameters */

        assert_param(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));

        /* Speed mode configuration */

        GPIOx->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEEDR0 << (pinpos * 2));

        GPIOx->OSPEEDR |= ((uint32_t)(GPIO_InitStruct->GPIO_Speed) << (pinpos * 2));

        /* Check Output mode parameters */

        assert_param(IS_GPIO_OTYPE(GPIO_InitStruct->GPIO_OType));

        /* Output mode configuration*/

        GPIOx->OTYPER  &= ~((GPIO_OTYPER_OT_0) << ((uint16_t)pinpos)) ;

        GPIOx->OTYPER |= (uint16_t)(((uint16_t)GPIO_InitStruct->GPIO_OType) << ((uint16_t)pinpos));

      }

      /* Pull-up Pull down resistor configuration*/

      GPIOx->PUPDR &= ~(GPIO_PUPDR_PUPDR0 << ((uint16_t)pinpos * 2));

      GPIOx->PUPDR |= (((uint32_t)GPIO_InitStruct->GPIO_PuPd) << (pinpos * 2));

    }

  }

}

/**

  * @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_Mode = GPIO_Mode_IN;

  GPIO_InitStruct->GPIO_Speed = GPIO_Speed_2MHz;

  GPIO_InitStruct->GPIO_OType = GPIO_OType_PP;

  GPIO_InitStruct->GPIO_PuPd = GPIO_PuPd_NOPULL;

}

/**

  * @brief  Locks GPIO Pins configuration registers.

  * @note   The locked registers are GPIOx_MODER, GPIOx_OTYPER, GPIOx_OSPEEDR,

  *         GPIOx_PUPDR, GPIOx_AFRL and GPIOx_AFRH.

  * @note   The configuration of the locked GPIO pins can no longer be modified

  *         until the next reset.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices.

  * @param  GPIO_Pin: specifies the port bit to be locked.

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

  * @retval None

  */

void GPIO_PinLockConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)

{

  __IO uint32_t tmp = 0x00010000;

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  assert_param(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;

}

/**

  * @}

  */

/** @defgroup GPIO_Group2 GPIO Read and Write

 *  @brief   GPIO Read and Write

 *

@verbatim   

 ===============================================================================

                         ##### GPIO Read and Write #####

 ===============================================================================  

@endverbatim

  * @{

  */

/**

  * @brief  Reads the specified input port pin.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices.

  * @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..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices. 

  * @retval GPIO input data port value.

  */

uint16_t GPIO_ReadInputData(GPIO_TypeDef* GPIOx)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  return ((uint16_t)GPIOx->IDR);

}

/**

  * @brief  Reads the specified output data port bit.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices. 

  * @param  GPIO_Pin: specifies the port bit to read.

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

  * @retval The output port pin value.

  */

uint8_t GPIO_ReadOutputDataBit(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->ODR) & GPIO_Pin) != (uint32_t)Bit_RESET)

  {

    bitstatus = (uint8_t)Bit_SET;

  }

  else

  {

    bitstatus = (uint8_t)Bit_RESET;

  }

  return bitstatus;

}

/**

  * @brief  Reads the specified GPIO output data port.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices.  

  * @retval GPIO output data port value.

  */

uint16_t GPIO_ReadOutputData(GPIO_TypeDef* GPIOx)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  return ((uint16_t)GPIOx->ODR);

}

/**

  * @brief  Sets the selected data port bits.

  * @note   This functions uses GPIOx_BSRR register to allow atomic read/modify 

  *         accesses. In this way, there is no risk of an IRQ occurring between

  *         the read and the modify access.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices.  

  * @param  GPIO_Pin: specifies the port bits to be written.

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

  * @retval None

  */

void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  assert_param(IS_GPIO_PIN(GPIO_Pin));

  GPIOx->BSRRL = GPIO_Pin;

}

/**

  * @brief  Clears the selected data port bits.

  * @note   This functions uses GPIOx_BSRR register to allow atomic read/modify 

  *         accesses. In this way, there is no risk of an IRQ occurring between

  *         the read and the modify access.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices. 

  * @param  GPIO_Pin: specifies the port bits to be written.

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

  * @retval None

  */

void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  assert_param(IS_GPIO_PIN(GPIO_Pin));

  GPIOx->BSRRH = GPIO_Pin;

}

/**

  * @brief  Sets or clears the selected data port bit.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices.  

  * @param  GPIO_Pin: specifies the port bit to be written.

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

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

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

  *            @arg Bit_RESET: to clear the port pin

  *            @arg Bit_SET: to set the port pin

  * @retval None

  */

void GPIO_WriteBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin, BitAction BitVal)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  assert_param(IS_GET_GPIO_PIN(GPIO_Pin));

  assert_param(IS_GPIO_BIT_ACTION(BitVal));

  if (BitVal != Bit_RESET)

  {

    GPIOx->BSRRL = GPIO_Pin;

  }

  else

  {

    GPIOx->BSRRH = GPIO_Pin ;

  }

}

/**

  * @brief  Writes data to the specified GPIO data port.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices.  

  * @param  PortVal: specifies the value to be written to the port output data register.

  * @retval None

  */

void GPIO_Write(GPIO_TypeDef* GPIOx, uint16_t PortVal)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  GPIOx->ODR = PortVal;

}

/**

  * @brief  Toggles the specified GPIO pins..

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices.  

  * @param  GPIO_Pin: Specifies the pins to be toggled.

  * @retval None

  */

void GPIO_ToggleBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)

{

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  GPIOx->ODR ^= GPIO_Pin;

}

/**

  * @}

  */

/** @defgroup GPIO_Group3 GPIO Alternate functions configuration function

 *  @brief   GPIO Alternate functions configuration function

 *

@verbatim   

 ===============================================================================

           ##### GPIO Alternate functions configuration function #####

 ===============================================================================  

@endverbatim

  * @{

  */

/**

  * @brief  Changes the mapping of the specified pin.

  * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral for 

  *                STM32F40xx/41xx and STM32F427x/437x devices. 

  * @param  GPIO_PinSource: specifies the pin for the Alternate function.

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

  * @param  GPIO_AFSelection: selects the pin to used as Alternate function.

  *          This parameter can be one of the following values:

  *            @arg GPIO_AF_RTC_50Hz: Connect RTC_50Hz pin to AF0 (default after reset) 

  *            @arg GPIO_AF_MCO: Connect MCO pin (MCO1 and MCO2) to AF0 (default after reset) 

  *            @arg GPIO_AF_TAMPER: Connect TAMPER pins (TAMPER_1 and TAMPER_2) to AF0 (default after reset) 

  *            @arg GPIO_AF_SWJ: Connect SWJ pins (SWD and JTAG)to AF0 (default after reset) 

  *            @arg GPIO_AF_TRACE: Connect TRACE pins to AF0 (default after reset)

  *            @arg GPIO_AF_TIM1: Connect TIM1 pins to AF1

  *            @arg GPIO_AF_TIM2: Connect TIM2 pins to AF1

  *            @arg GPIO_AF_TIM3: Connect TIM3 pins to AF2

  *            @arg GPIO_AF_TIM4: Connect TIM4 pins to AF2

  *            @arg GPIO_AF_TIM5: Connect TIM5 pins to AF2

  *            @arg GPIO_AF_TIM8: Connect TIM8 pins to AF3

  *            @arg GPIO_AF_TIM9: Connect TIM9 pins to AF3

  *            @arg GPIO_AF_TIM10: Connect TIM10 pins to AF3

  *            @arg GPIO_AF_TIM11: Connect TIM11 pins to AF3

  *            @arg GPIO_AF_I2C1: Connect I2C1 pins to AF4

  *            @arg GPIO_AF_I2C2: Connect I2C2 pins to AF4

  *            @arg GPIO_AF_I2C3: Connect I2C3 pins to AF4

  *            @arg GPIO_AF_SPI1: Connect SPI1 pins to AF5

  *            @arg GPIO_AF_SPI2: Connect SPI2/I2S2 pins to AF5

  *            @arg GPIO_AF_SPI4: Connect SPI4 pins to AF5 

  *            @arg GPIO_AF_SPI5: Connect SPI5 pins to AF5 

  *            @arg GPIO_AF_SPI6: Connect SPI6 pins to AF5       

  *            @arg GPIO_AF_SPI3: Connect SPI3/I2S3 pins to AF6

  *            @arg GPIO_AF_I2S3ext: Connect I2S3ext pins to AF7

  *            @arg GPIO_AF_USART1: Connect USART1 pins to AF7

  *            @arg GPIO_AF_USART2: Connect USART2 pins to AF7

  *            @arg GPIO_AF_USART3: Connect USART3 pins to AF7

  *            @arg GPIO_AF_UART4: Connect UART4 pins to AF8

  *            @arg GPIO_AF_UART5: Connect UART5 pins to AF8

  *            @arg GPIO_AF_USART6: Connect USART6 pins to AF8

  *            @arg GPIO_AF_UART7: Connect UART7 pins to AF8

  *            @arg GPIO_AF_UART8: Connect UART8 pins to AF8

  *            @arg GPIO_AF_CAN1: Connect CAN1 pins to AF9

  *            @arg GPIO_AF_CAN2: Connect CAN2 pins to AF9

  *            @arg GPIO_AF_TIM12: Connect TIM12 pins to AF9

  *            @arg GPIO_AF_TIM13: Connect TIM13 pins to AF9

  *            @arg GPIO_AF_TIM14: Connect TIM14 pins to AF9

  *            @arg GPIO_AF_OTG_FS: Connect OTG_FS pins to AF10

  *            @arg GPIO_AF_OTG_HS: Connect OTG_HS pins to AF10

  *            @arg GPIO_AF_ETH: Connect ETHERNET pins to AF11

  *            @arg GPIO_AF_FSMC: Connect FSMC pins to AF12   

  *            @arg GPIO_AF_OTG_HS_FS: Connect OTG HS (configured in FS) pins to AF12

  *            @arg GPIO_AF_SDIO: Connect SDIO pins to AF12

  *            @arg GPIO_AF_DCMI: Connect DCMI pins to AF13 

  *            @arg GPIO_AF_EVENTOUT: Connect EVENTOUT pins to AF15

  * @retval None

  */

void GPIO_PinAFConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_PinSource, uint8_t GPIO_AF)

{

  uint32_t temp = 0x00;

  uint32_t temp_2 = 0x00;

  /* Check the parameters */

  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

  assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));

  assert_param(IS_GPIO_AF(GPIO_AF));

  temp = ((uint32_t)(GPIO_AF) << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;

  GPIOx->AFR[GPIO_PinSource >> 0x03] &= ~((uint32_t)0xF << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;

  temp_2 = GPIOx->AFR[GPIO_PinSource >> 0x03] | temp;

  GPIOx->AFR[GPIO_PinSource >> 0x03] = temp_2;

}

/**

  * @}

  */ 

/**

  * @}

  */

/**

  * @}

  */ 

/**

  * @}

  */ 

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