tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F0/stm32f0xx_hal_gpio.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32f0xx_hal_gpio.c
   4   * @author  MCD Application Team
   5   * @version V1.2.0
   6   * @date    11-December-2014
   7   * @brief   GPIO HAL module driver.
   8   *          This file provides firmware functions to manage the following
   9   *          functionalities of the General Purpose Input/Output (GPIO) peripheral:
  10   *           + Initialization and de-initialization functions
  11   *           + IO operation functions
  12   *
  13   @verbatim
  14   ==============================================================================
  15                     ##### GPIO Peripheral features #####
  16   ==============================================================================
  17   [..]
  18   Each port bit of the general-purpose I/O (GPIO) ports can be individually
  19   configured by software in several modes:
  20   (+) Input mode
  21   (+) Analog mode
  22   (+) Output mode
  23   (+) Alternate function mode
  24   (+) External interrupt/event lines
  25
  26   [..]
  27   During and just after reset, the alternate functions and external interrupt
  28   lines are not active and the I/O ports are configured in input floating mode.
  29
  30   [..]
  31   All GPIO pins have weak internal pull-up and pull-down resistors, which can be
  32   activated or not.
  33
  34   [..]
  35   In Output or Alternate mode, each IO can be configured on open-drain or push-pull
  36   type and the IO speed can be selected depending on the VDD value.
  37
  38   [..]
  39   The microcontroller IO pins are connected to onboard peripherals/modules through a
  40   multiplexer that allows only one peripheral s alternate function (AF) connected
  41   to an IO pin at a time. In this way, there can be no conflict between peripherals
  42   sharing the same IO pin.
  43
  44   [..]
  45   All ports have external interrupt/event capability. To use external interrupt
  46   lines, the port must be configured in input mode. All available GPIO pins are
  47   connected to the 16 external interrupt/event lines from EXTI0 to EXTI15.
  48
  49   [..]
  50   The external interrupt/event controller consists of up to 28 edge detectors
  51   (depending on products 16 lines are connected to GPIO) for generating event/interrupt
  52   requests (each input line can be independently configured to select the type
  53   (interrupt or event) and the corresponding trigger event (rising or falling or both).
  54   Each line can also be masked independently.
  55
  56             ##### How to use this driver #####
  57   ==============================================================================
  58   [..]
  59    (#) Enable the GPIO AHB clock using the following function : __GPIOx_CLK_ENABLE().
  60
  61    (#) Configure the GPIO pin(s) using HAL_GPIO_Init().
  62        (++) Configure the IO mode using "Mode" member from GPIO_InitTypeDef structure
  63        (++) Activate Pull-up, Pull-down resistor using "Pull" member from GPIO_InitTypeDef
  64             structure.
  65        (++) In case of Output or alternate function mode selection: the speed is
  66             configured through "Speed" member from GPIO_InitTypeDef structure,
  67             the speed is configurable: Low, Medium and High.
  68        (++) If alternate mode is selected, the alternate function connected to the IO
  69             is configured through "Alternate" member from GPIO_InitTypeDef structure
  70        (++) Analog mode is required when a pin is to be used as ADC channel
  71             or DAC output.
  72        (++) In case of external interrupt/event selection the "Mode" member from
  73             GPIO_InitTypeDef structure select the type (interrupt or event) and
  74             the corresponding trigger event (rising or falling or both).
  75
  76    (#) In case of external interrupt/event mode selection, configure NVIC IRQ priority
  77        mapped to the EXTI line using HAL_NVIC_SetPriority() and enable it using
  78        HAL_NVIC_EnableIRQ().
  79
  80    (#) HAL_GPIO_DeInit allows to set register values to their reset value. It's also
  81        recommended to use it to unconfigure pin which was used as an external interrupt
  82        or in event mode. That's the only way to reset corresponding bit in EXTI & SYSCFG
  83        registers.
  84
  85    (#) To get the level of a pin configured in input mode use HAL_GPIO_ReadPin().
  86
  87    (#) To set/reset the level of a pin configured in output mode use
  88        HAL_GPIO_WritePin()/HAL_GPIO_TogglePin().
  89
  90    (#) To lock pin configuration until next reset use HAL_GPIO_LockPin().
  91
  92    (#) During and just after reset, the alternate functions are not
  93        active and the GPIO pins are configured in input floating mode (except JTAG
  94        pins).
  95
  96    (#) The LSE oscillator pins OSC32_IN and OSC32_OUT can be used as general purpose
  97        (PC14 and PC15, respectively) when the LSE oscillator is off. The LSE has
  98        priority over the GPIO function.
  99
 100    (#) The HSE oscillator pins OSC_IN/OSC_OUT can be used as
 101        general purpose PD0 and PD1, respectively, when the HSE oscillator is off.
 102        The HSE has priority over the GPIO function.
 103
 104   @endverbatim
 105   ******************************************************************************
 106   * @attention
 107   *
 108   * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
 109   *
 110   * Redistribution and use in source and binary forms, with or without modification,
 111   * are permitted provided that the following conditions are met:
 112   *   1. Redistributions of source code must retain the above copyright notice,
 113   *      this list of conditions and the following disclaimer.
 114   *   2. Redistributions in binary form must reproduce the above copyright notice,
 115   *      this list of conditions and the following disclaimer in the documentation
 116   *      and/or other materials provided with the distribution.
 117   *   3. Neither the name of STMicroelectronics nor the names of its contributors
 118   *      may be used to endorse or promote products derived from this software
 119   *      without specific prior written permission.
 120   *
 121   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 122   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 123   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 124   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 125   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 126   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 127   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 128   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 129   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 130   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 131   *
 132   ******************************************************************************
 133   */
 134
 135 /* Includes ------------------------------------------------------------------*/
 136 #include "stm32f0xx_hal.h"
 137
 138 /** @addtogroup STM32F0xx_HAL_Driver
 139   * @{
 140   */
 141
 142 /** @defgroup GPIO GPIO HAL module driver
 143   * @brief GPIO HAL module driver
 144   * @{
 145   */
 146
 147 #ifdef HAL_GPIO_MODULE_ENABLED
 148
 149 /* Private typedef -----------------------------------------------------------*/
 150 /* Private define ------------------------------------------------------------*/
 151 /** @defgroup GPIO_Private_Define GPIO Private Define
 152   * @{
 153   */
 154 #define GPIO_MODE             ((uint32_t)0x00000003)
 155 #define EXTI_MODE             ((uint32_t)0x10000000)
 156 #define GPIO_MODE_IT          ((uint32_t)0x00010000)
 157 #define GPIO_MODE_EVT         ((uint32_t)0x00020000)
 158 #define RISING_EDGE           ((uint32_t)0x00100000)
 159 #define FALLING_EDGE          ((uint32_t)0x00200000)
 160 #define GPIO_OUTPUT_TYPE      ((uint32_t)0x00000010)
 161
 162 #define GPIO_NUMBER           ((uint32_t)16)
 163
 164 /**
 165   * @}
 166   */
 167
 168 /* Private macro -------------------------------------------------------------*/
 169 /* Private variables ---------------------------------------------------------*/
 170 /* Private function prototypes -----------------------------------------------*/
 171 /* Exporte functions ---------------------------------------------------------*/
 172
 173 /** @defgroup GPIO_Exported_Functions GPIO Exported Functions
 174   * @{
 175   */
 176
 177 /** @defgroup GPIO_Exported_Functions_Group1 Initialization/de-initialization functions
 178  *  @brief    Initialization and Configuration functions
 179  *
 180 @verbatim
 181  ===============================================================================
 182               ##### Initialization and de-initialization functions #####
 183  ===============================================================================
 184
 185 @endverbatim
 186   * @{
 187   */
 188
 189 /**
 190   * @brief  Initializes the GPIOx peripheral according to the specified parameters in the GPIO_Init.
 191   * @param  GPIOx: where x can be (A..F) to select the GPIO peripheral for STM32F0 family
 192   *   @note   GPIOD is only available on STM32F05xx, STM32F07xx and STM32F09xx
 193   *   @note   GPIOE is only available on STM32F07xx and STM32F09xx
 194   * @param  GPIO_Init: pointer to a GPIO_InitTypeDef structure that contains
 195   *         the configuration information for the specified GPIO peripheral.
 196   * @retval None
 197   */
 198 void HAL_GPIO_Init(GPIO_TypeDef  *GPIOx, GPIO_InitTypeDef *GPIO_Init)
 199 {
 200   uint32_t position = 0x00;
 201   uint32_t iocurrent = 0x00;
 202   uint32_t temp = 0x00;
 203
 204   /* Check the parameters */
 205   assert_param(IS_GPIO_ALL_INSTANCE(GPIOx));
 206   assert_param(IS_GPIO_PIN(GPIO_Init->Pin));
 207   assert_param(IS_GPIO_MODE(GPIO_Init->Mode));
 208   assert_param(IS_GPIO_PULL(GPIO_Init->Pull));
 209
 210   /* Configure the port pins */
 211   while ((GPIO_Init->Pin) >> position)
 212   {
 213     /* Get current io position */
 214     iocurrent = (GPIO_Init->Pin) & (1 << position);
 215
 216     if(iocurrent)
 217     {
 218       /*--------------------- GPIO Mode Configuration ------------------------*/
 219       /* In case of Alternate function mode selection */
 220       if((GPIO_Init->Mode == GPIO_MODE_AF_PP) || (GPIO_Init->Mode == GPIO_MODE_AF_OD))
 221       {
 222         /* Check the Alternate function parameters */
 223         assert_param(IS_GPIO_AF_INSTANCE(GPIOx));
 224         assert_param(IS_GPIO_AF(GPIO_Init->Alternate));
 225
 226         /* Configure Alternate function mapped with the current IO */
 227         temp = GPIOx->AFR[position >> 3];
 228         temp &= ~((uint32_t)0xF << ((uint32_t)(position & (uint32_t)0x07) * 4)) ;
 229         temp |= ((uint32_t)(GPIO_Init->Alternate) << (((uint32_t)position & (uint32_t)0x07) * 4));
 230         GPIOx->AFR[position >> 3] = temp;
 231       }
 232
 233       /* Configure IO Direction mode (Input, Output, Alternate or Analog) */
 234       temp = GPIOx->MODER;
 235       temp &= ~(GPIO_MODER_MODER0 << (position * 2));
 236       temp |= ((GPIO_Init->Mode & GPIO_MODE) << (position * 2));
 237       GPIOx->MODER = temp;
 238
 239       /* In case of Output or Alternate function mode selection */
 240       if ((GPIO_Init->Mode == GPIO_MODE_OUTPUT_PP) || (GPIO_Init->Mode == GPIO_MODE_AF_PP) ||
 241           (GPIO_Init->Mode == GPIO_MODE_OUTPUT_OD) || (GPIO_Init->Mode == GPIO_MODE_AF_OD))
 242       {
 243         /* Check the Speed parameter */
 244         assert_param(IS_GPIO_SPEED(GPIO_Init->Speed));
 245         /* Configure the IO Speed */
 246         temp = GPIOx->OSPEEDR;
 247         temp &= ~(GPIO_OSPEEDER_OSPEEDR0 << (position * 2));
 248         temp |= (GPIO_Init->Speed << (position * 2));
 249         GPIOx->OSPEEDR = temp;
 250
 251         /* Configure the IO Output Type */
 252         temp = GPIOx->OTYPER;
 253         temp &= ~(GPIO_OTYPER_OT_0 << position) ;
 254         temp |= (((GPIO_Init->Mode & GPIO_OUTPUT_TYPE) >> 4) << position);
 255         GPIOx->OTYPER = temp;
 256       }
 257
 258       /* Activate the Pull-up or Pull down resistor for the current IO */
 259       temp = GPIOx->PUPDR;
 260       temp &= ~(GPIO_PUPDR_PUPDR0 << (position * 2));
 261       temp |= ((GPIO_Init->Pull) << (position * 2));
 262       GPIOx->PUPDR = temp;
 263
 264       /*--------------------- EXTI Mode Configuration ------------------------*/
 265       /* Configure the External Interrupt or event for the current IO */
 266       if((GPIO_Init->Mode & EXTI_MODE) == EXTI_MODE)
 267       {
 268         /* Enable SYSCFG Clock */
 269         __SYSCFG_CLK_ENABLE();
 270
 271         temp = SYSCFG->EXTICR[position >> 2];
 272         temp &= ~(((uint32_t)0x0F) << (4 * (position & 0x03)));
 273         temp |= (GPIO_GET_INDEX(GPIOx) << (4 * (position & 0x03)));
 274         SYSCFG->EXTICR[position >> 2] = temp;
 275
 276         /* Clear EXTI line configuration */
 277         temp = EXTI->IMR;
 278         temp &= ~((uint32_t)iocurrent);
 279         if((GPIO_Init->Mode & GPIO_MODE_IT) == GPIO_MODE_IT)
 280         {
 281           temp |= iocurrent;
 282         }
 283         EXTI->IMR = temp;
 284
 285         temp = EXTI->EMR;
 286         temp &= ~((uint32_t)iocurrent);
 287         if((GPIO_Init->Mode & GPIO_MODE_EVT) == GPIO_MODE_EVT)
 288         {
 289           temp |= iocurrent;
 290         }
 291         EXTI->EMR = temp;
 292
 293         /* Clear Rising Falling edge configuration */
 294         temp = EXTI->RTSR;
 295         temp &= ~((uint32_t)iocurrent);
 296         if((GPIO_Init->Mode & RISING_EDGE) == RISING_EDGE)
 297         {
 298           temp |= iocurrent;
 299         }
 300         EXTI->RTSR = temp;
 301
 302         temp = EXTI->FTSR;
 303         temp &= ~((uint32_t)iocurrent);
 304         if((GPIO_Init->Mode & FALLING_EDGE) == FALLING_EDGE)
 305         {
 306           temp |= iocurrent;
 307         }
 308         EXTI->FTSR = temp;
 309       }
 310     }
 311
 312     position++;
 313   }
 314 }
 315
 316 /**
 317   * @brief  De-initializes the GPIOx peripheral registers to their default reset values.
 318   * @param  GPIOx: where x can be (A..F) to select the GPIO peripheral for STM32F0 family
 319   *   @note   GPIOD is only available on STM32F05xx, STM32F07xx and STM32F09xx
 320   *   @note   GPIOE is only available on STM32F07xx and STM32F09xx
 321   * @param  GPIO_Pin: specifies the port bit to be written.
 322   *         This parameter can be one of GPIO_PIN_x where x can be (0..15).
 323   * @retval None
 324   */
 325 void HAL_GPIO_DeInit(GPIO_TypeDef  *GPIOx, uint32_t GPIO_Pin)
 326 {
 327   uint32_t position = 0x00;
 328   uint32_t iocurrent = 0x00;
 329   uint32_t tmp = 0x00;
 330
 331   /* Check the parameters */
 332   assert_param(IS_GPIO_ALL_INSTANCE(GPIOx));
 333   assert_param(IS_GPIO_PIN(GPIO_Pin));
 334
 335   /* Configure the port pins */
 336   while (GPIO_Pin >> position)
 337   {
 338     /* Get current io position */
 339     iocurrent = (GPIO_Pin) & (1 << position);
 340
 341     if (iocurrent)
 342     {
 343       /*------------------------- GPIO Mode Configuration --------------------*/
 344       /* Configure IO Direction in Input Floting Mode */
 345       GPIOx->MODER &= ~(GPIO_MODER_MODER0 << (position * 2));
 346
 347       /* Configure the default Alternate Function in current IO */
 348       GPIOx->AFR[position >> 3] &= ~((uint32_t)0xF << ((uint32_t)(position & (uint32_t)0x07) * 4)) ;
 349
 350       /* Configure the default value for IO Speed */
 351       GPIOx->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEEDR0 << (position * 2));
 352
 353       /* Configure the default value IO Output Type */
 354       GPIOx->OTYPER  &= ~(GPIO_OTYPER_OT_0 << position) ;
 355
 356       /* Deactivate the Pull-up oand Pull-down resistor for the current IO */
 357       GPIOx->PUPDR &= ~(GPIO_PUPDR_PUPDR0 << (position * 2));
 358
 359       /*------------------------- EXTI Mode Configuration --------------------*/
 360       /* Clear the External Interrupt or Event for the current IO */
 361
 362       tmp = SYSCFG->EXTICR[position >> 2];
 363       tmp &= (((uint32_t)0x0F) << (4 * (position & 0x03)));
 364       if(tmp == (GPIO_GET_INDEX(GPIOx) << (4 * (position & 0x03))))
 365       {
 366         tmp = ((uint32_t)0x0F) << (4 * (position & 0x03));
 367         SYSCFG->EXTICR[position >> 2] &= ~tmp;
 368
 369         /* Clear EXTI line configuration */
 370         EXTI->IMR &= ~((uint32_t)iocurrent);
 371         EXTI->EMR &= ~((uint32_t)iocurrent);
 372
 373         /* Clear Rising Falling edge configuration */
 374         EXTI->RTSR &= ~((uint32_t)iocurrent);
 375         EXTI->FTSR &= ~((uint32_t)iocurrent);
 376       }
 377     }
 378
 379     position++;
 380   }
 381 }
 382
 383 /**
 384   * @}
 385   */
 386
 387 /** @defgroup GPIO_Exported_Functions_Group2 IO operation functions
 388  *  @brief GPIO Read, Write, Toggle, Lock and EXTI management functions.
 389  *
 390 @verbatim
 391  ===============================================================================
 392                        ##### IO operation functions #####
 393  ===============================================================================
 394
 395 @endverbatim
 396   * @{
 397   */
 398
 399 /**
 400   * @brief  Reads the specified input port pin.
 401   * @param  GPIOx: where x can be (A..F) to select the GPIO peripheral for STM32F0 family
 402   *   @note   GPIOD is only available on STM32F05xx, STM32F07xx and STM32F09xx
 403   *   @note   GPIOE is only available on STM32F07xx and STM32F09xx
 404   * @param  GPIO_Pin: specifies the port bit to read.
 405   *         This parameter can be GPIO_PIN_x where x can be (0..15).
 406   * @retval The input port pin value.
 407   */
 408 GPIO_PinState HAL_GPIO_ReadPin(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
 409 {
 410   GPIO_PinState bitstatus;
 411
 412   /* Check the parameters */
 413   assert_param(IS_GPIO_PIN(GPIO_Pin));
 414
 415   if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)GPIO_PIN_RESET)
 416   {
 417     bitstatus = GPIO_PIN_SET;
 418   }
 419   else
 420   {
 421     bitstatus = GPIO_PIN_RESET;
 422   }
 423   return bitstatus;
 424   }
 425
 426 /**
 427   * @brief  Sets or clears the selected data port bit.
 428   * @note   This function uses GPIOx_BSRR register to allow atomic read/modify
 429   *         accesses. In this way, there is no risk of an IRQ occurring between
 430   *         the read and the modify access.
 431   * @param  GPIOx: where x can be (A..F) to select the GPIO peripheral for STM32F0 family
 432   *   @note   GPIOD is only available on STM32F05xx, STM32F07xx and STM32F09xx
 433   *   @note   GPIOE is only available on STM32F07xx and STM32F09xx
 434   * @param  GPIO_Pin: specifies the port bit to be written.
 435   *          This parameter can be one of GPIO_PIN_x where x can be (0..15).
 436   * @param  PinState: specifies the value to be written to the selected bit.
 437   *          This parameter can be one of the GPIO_PinState enum values:
 438   *            @arg GPIO_PIN_RESET: to clear the port pin
 439   *            @arg GPIO_PIN_SET: to set the port pin
 440   * @retval None
 441   */
 442 void HAL_GPIO_WritePin(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin, GPIO_PinState PinState)
 443 {
 444   /* Check the parameters */
 445   assert_param(IS_GPIO_PIN(GPIO_Pin));
 446   assert_param(IS_GPIO_PIN_ACTION(PinState));
 447
 448   if (PinState != GPIO_PIN_RESET)
 449   {
 450     GPIOx->BSRR = (uint32_t)GPIO_Pin;
 451   }
 452   else
 453   {
 454     GPIOx->BSRR = (uint32_t)GPIO_Pin << 16 ;
 455   }
 456 }
 457
 458 /**
 459   * @brief  Toggles the specified GPIO pin
 460   * @param  GPIOx: where x can be (A..F) to select the GPIO peripheral for STM32F0 family
 461   *   @note   GPIOD is only available on STM32F05xx, STM32F07xx and STM32F09xx
 462   *   @note   GPIOE is only available on STM32F07xx and STM32F09xx
 463   * @param  GPIO_Pin: specifies the pins to be toggled.
 464   * @retval None
 465   */
 466 void HAL_GPIO_TogglePin(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
 467 {
 468   /* Check the parameters */
 469   assert_param(IS_GPIO_PIN(GPIO_Pin));
 470
 471   GPIOx->ODR ^= GPIO_Pin;
 472 }
 473
 474 /**
 475 * @brief  Locks GPIO Pins configuration registers.
 476 * @note   The locked registers are GPIOx_MODER, GPIOx_OTYPER, GPIOx_OSPEEDR,
 477 *         GPIOx_PUPDR, GPIOx_AFRL and GPIOx_AFRH.
 478 * @note   The configuration of the locked GPIO pins can no longer be modified
 479 *         until the next reset.
 480 * @param  GPIOx: where x can be (A..F) to select the GPIO peripheral for STM32F0 family
 481 *   @note   GPIOD is only available on STM32F05xx, STM32F07xx and STM32F09xx
 482 *   @note   GPIOE is only available on STM32F07xx and STM32F09xx
 483 * @param  GPIO_Pin: specifies the port bit to be locked.
 484 *         This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
 485 * @retval None
 486 */
 487 HAL_StatusTypeDef HAL_GPIO_LockPin(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
 488 {
 489   __IO uint32_t tmp = GPIO_LCKR_LCKK;
 490
 491   /* Check the parameters */
 492   assert_param(IS_GPIO_LOCK_INSTANCE(GPIOx));
 493   assert_param(IS_GPIO_PIN(GPIO_Pin));
 494
 495   /* Apply lock key write sequence */
 496   tmp |= GPIO_Pin;
 497   /* Set LCKx bit(s): LCKK='1' + LCK[15-0] */
 498   GPIOx->LCKR = tmp;
 499   /* Reset LCKx bit(s): LCKK='0' + LCK[15-0] */
 500   GPIOx->LCKR = GPIO_Pin;
 501   /* Set LCKx bit(s): LCKK='1' + LCK[15-0] */
 502   GPIOx->LCKR = tmp;
 503   /* Read LCKK bit*/
 504   tmp = GPIOx->LCKR;
 505
 506   if((GPIOx->LCKR & GPIO_LCKR_LCKK) != RESET)
 507   {
 508     return HAL_OK;
 509   }
 510   else
 511   {
 512     return HAL_ERROR;
 513   }
 514 }
 515
 516 /**
 517   * @brief  This function handles EXTI interrupt request.
 518   * @param  GPIO_Pin: Specifies the port pin connected to corresponding EXTI line.
 519   * @retval None
 520   */
 521 void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)
 522 {
 523   /* EXTI line interrupt detected */
 524   if(__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != RESET)
 525   {
 526     __HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
 527     HAL_GPIO_EXTI_Callback(GPIO_Pin);
 528   }
 529 }
 530
 531 /**
 532   * @brief  EXTI line detection callbacks.
 533   * @param  GPIO_Pin: Specifies the port pin connected to corresponding EXTI line.
 534   * @retval None
 535   */
 536 __weak void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
 537 {
 538   /* NOTE : This function Should not be modified, when the callback is needed,
 539             the HAL_GPIO_EXTI_Callback could be implemented in the user file
 540    */
 541 }
 542
 543 /**
 544   * @}
 545   */
 546
 547
 548 /**
 549   * @}
 550   */
 551
 552 #endif /* HAL_GPIO_MODULE_ENABLED */
 553 /**
 554   * @}
 555   */
 556
 557 /**
 558   * @}
 559   */
 560
 561 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/