Diff: targets/cmsis/TARGET_STM/TARGET_NUCLEO_F030R8/stm32f0xx_gpio.c

Revision:

76:aeb1df146756

Child:

106:ced8cbb51063

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F030R8/stm32f0xx_gpio.c	Mon Jan 27 14:30:07 2014 +0000
@@ -0,0 +1,540 @@
+/**
+  ******************************************************************************
+  * @file    stm32f0xx_gpio.c
+  * @author  MCD Application Team
+  * @version V1.3.0
+  * @date    16-January-2014
+  * @brief   This file provides firmware functions to manage the following 
+  *          functionalities of the GPIO peripheral:
+  *           + Initialization and Configuration functions
+  *           + GPIO Read and Write functions
+  *           + GPIO Alternate functions configuration functions
+  *
+  *  @verbatim
+  *
+  *
+    ===========================================================================
+                         ##### How to use this driver #####
+    ===========================================================================
+      [..]
+      (#) Enable the GPIO AHB clock using RCC_AHBPeriphClockCmd()
+      (#) 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: Low, Medium, Fast or High.
+         (++) 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,
+              DAC output or comparator input.
+      (#) Peripherals alternate function:
+         (++) For ADC, DAC and comparators, 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. For PortC, 
+                    PortD and PortF, no configuration is needed.
+              (+++) 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 
+          PD0 and PD1, respectively, when the HSE oscillator is off. The HSE has 
+          priority over the GPIO function.
+    @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2014 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 "stm32f0xx_gpio.h"
+#include "stm32f0xx_rcc.h"
+
+/** @addtogroup STM32F0xx_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  Deinitializes the GPIOx peripheral registers to their default reset 
+  *         values.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.    
+  * @retval None
+  */
+void GPIO_DeInit(GPIO_TypeDef* GPIOx)
+{
+  /* Check the parameters */
+  assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
+
+  if(GPIOx == GPIOA)
+  {
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOA, ENABLE);
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOA, DISABLE);
+  }
+  else if(GPIOx == GPIOB)
+  {
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOB, ENABLE);
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOB, DISABLE);
+  }
+  else if(GPIOx == GPIOC)
+  {
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOC, ENABLE);
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOC, DISABLE);
+  }
+  else if(GPIOx == GPIOD)
+  {
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOD, ENABLE);
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOD, DISABLE);
+  }
+  else if(GPIOx == GPIOE)
+  {
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOE, ENABLE);
+    RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOE, DISABLE);
+  }
+  else
+  {
+    if(GPIOx == GPIOF)
+    {
+      RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOF, ENABLE);
+      RCC_AHBPeriphResetCmd(RCC_AHBPeriph_GPIOF, DISABLE);
+    }
+  }
+}
+
+/**
+  * @brief  Initializes the GPIOx peripheral according to the specified 
+  *         parameters in the GPIO_InitStruct.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.   
+  * @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)
+    {
+      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));
+      }
+
+      GPIOx->MODER  &= ~(GPIO_MODER_MODER0 << (pinpos * 2));
+
+      GPIOx->MODER |= (((uint32_t)GPIO_InitStruct->GPIO_Mode) << (pinpos * 2));
+
+      /* 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_Level_2;
+  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 device reset.
+  * @param  GPIOx: where x can be (A or B) to select the GPIO peripheral.
+  * @param  GPIO_Pin: specifies the port bit to be written.
+  *          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_LIST_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, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.   
+  * @param  GPIO_Pin: specifies the port bit to read.
+  * @note   This parameter can be GPIO_Pin_x where x can be:
+  *         For STM32F051 and STM32F030: (0..15) for GPIOA, GPIOB, GPIOC, (2) for GPIOD and (0..1, 4..7) for GIIOF.
+  *         For STM32F072: (0..15) for GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, (0..10) for GPIOF.
+  *         For STM32F031: (0..15) for GPIOA, GPIOB, (13..15) for GPIOC and (0..1, 6..7) for GPIOF.  
+  * @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 input port pin.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.   
+  * @retval The input port pin 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, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.   
+  * @param  GPIO_Pin: Specifies the port bit to read.
+  * @note   This parameter can be GPIO_Pin_x where x can be:
+  *         For STM32F051 and STM32F030: (0..15) for GPIOA, GPIOB, GPIOC, (2) for GPIOD and (0..1, 4..7) for GIIOF.
+  *         For STM32F072: (0..15) for GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, (0..10) for GPIOF.
+  *         For STM32F031: (0..15) for GPIOA, GPIOB, (13..15) for GPIOC and (0..1, 6..7) for GPIOF. 
+  * @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, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.    
+  * @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.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.    
+  * @param  GPIO_Pin: specifies the port bits to be written.
+  * @note   This parameter can be GPIO_Pin_x where x can be:
+  *         For STM32F051 and STM32F030: (0..15) for GPIOA, GPIOB, GPIOC, (2) for GPIOD and (0..1, 4..7) for GIIOF.
+  *         For STM32F072: (0..15) for GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, (0..10) for GPIOF.
+  *         For STM32F031: (0..15) for GPIOA, GPIOB, (13..15) for GPIOC and (0..1, 6..7) for GPIOF. 
+  * @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->BSRR = GPIO_Pin;
+}
+
+/**
+  * @brief  Clears the selected data port bits.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.
+  * @param  GPIO_Pin: specifies the port bits to be written.
+  * @note   This parameter can be GPIO_Pin_x where x can be:
+  *         For STM32F051 and STM32F030: (0..15) for GPIOA, GPIOB, GPIOC, (2) for GPIOD and (0..1, 4..7) for GIIOF.
+  *         For STM32F072: (0..15) for GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, (0..10) for GPIOF.
+  *         For STM32F031: (0..15) for GPIOA, GPIOB, (13..15) for GPIOC and (0..1, 6..7) for GPIOF. 
+  * @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->BRR = GPIO_Pin;
+}
+
+/**
+  * @brief  Sets or clears the selected data port bit.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.  
+  * @param  GPIO_Pin: specifies the port bit to be written.
+  * @param  BitVal: specifies the value to be written to the selected bit.
+  *          This parameter can be one of the BitAction enumeration values:
+  *            @arg Bit_RESET: to clear the port pin
+  *            @arg Bit_SET: to set the port pin
+  * @note   This parameter can be GPIO_Pin_x where x can be:
+  *         For STM32F051 and STM32F030: (0..15) for GPIOA, GPIOB, GPIOC, (2) for GPIOD and (0..1, 4..7) for GIIOF.
+  *         For STM32F072: (0..15) for GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, (0..10) for GPIOF.
+  *         For STM32F031: (0..15) for GPIOA, GPIOB, (13..15) for GPIOC and (0..1, 6..7) for GPIOF.
+  * @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->BSRR = GPIO_Pin;
+  }
+  else
+  {
+    GPIOx->BRR = GPIO_Pin ;
+  }
+}
+
+/**
+  * @brief  Writes data to the specified GPIO data port.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOE is available only for STM32F072.
+  * @note   GPIOD is not available for STM32F031.  
+  * @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;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup GPIO_Group3 GPIO Alternate functions configuration functions
+ *  @brief   GPIO Alternate functions configuration functions
+ *
+@verbatim   
+ ===============================================================================
+          ##### GPIO Alternate functions configuration functions #####
+ ===============================================================================  
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Writes data to the specified GPIO data port.
+  * @param  GPIOx: where x can be (A, B, C, D, E or F) to select the GPIO peripheral.
+  * @note   GPIOC, GPIOD, GPIOE and GPIOF  are available only for STM32F072. 
+  * @param  GPIO_PinSource: specifies the pin for the Alternate function.
+  *          This parameter can be GPIO_PinSourcex where x can be (0..15) for GPIOA, GPIOB, GPIOD, GPIOE
+  *          and (0..12) for GPIOC and (0, 2..5, 9..10) for GPIOF.    
+  * @param  GPIO_AF: selects the pin to used as Alternate function.
+  *          This parameter can be one of the following value:
+  *            @arg GPIO_AF_0:  WKUP, EVENTOUT, TIM15, SPI1, TIM17, MCO, SWDAT, SWCLK,
+  *                             TIM14, BOOT, USART1, CEC, IR_OUT, SPI2, TIM3, USART4,
+  *                             CAN, USART2, CRS, TIM16, TIM1, TS 
+  *            @arg GPIO_AF_1: USART2, CEC, TIM3, USART1, USART2, EVENTOUT, I2C1,
+  *                            I2C2, TIM15, SPI2, USART3, TS, SPI1 
+  *            @arg GPIO_AF_2: TIM2, TIM1, EVENTOUT, TIM16, TIM17, USB
+  *            @arg GPIO_AF_3: TS, I2C1, TIM15, EVENTOUT 
+  *            @arg GPIO_AF_4: TIM14, USART4, USART3, CRS, CAN
+  *            @arg GPIO_AF_5: TIM16, TIM17, TIM15, SPI2, I2C2
+  *            @arg GPIO_AF_6: EVENTOUT
+  *            @arg GPIO_AF_7: COMP1 OUT, COMP2 OUT 
+  * @note   The pin should already been configured in Alternate Function mode(AF)
+  *         using GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
+  * @note   Refer to the Alternate function mapping table in the device datasheet 
+  *         for the detailed mapping of the system and peripherals'alternate 
+  *         function I/O pins.
+  * @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****/