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/**
******************************************************************************
* @file stm32f4xx_hal_exti.c
* @author MCD Application Team
* @brief EXTI HAL module driver.
* This file provides firmware functions to manage the following
* functionalities of the Extended Interrupts and events controller (EXTI) peripheral:
* + Initialization and de-initialization functions
* + IO operation functions
*
******************************************************************************
* @attention
*
* Copyright (c) 2018 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@verbatim
==============================================================================
##### EXTI Peripheral features #####
==============================================================================
[..]
(+) Each Exti line can be configured within this driver.
(+) Exti line can be configured in 3 different modes
(++) Interrupt
(++) Event
(++) Both of them
(+) Configurable Exti lines can be configured with 3 different triggers
(++) Rising
(++) Falling
(++) Both of them
(+) When set in interrupt mode, configurable Exti lines have two different
interrupts pending registers which allow to distinguish which transition
occurs:
(++) Rising edge pending interrupt
(++) Falling
(+) Exti lines 0 to 15 are linked to gpio pin number 0 to 15. Gpio port can
be selected through multiplexer.
##### How to use this driver #####
==============================================================================
[..]
(#) Configure the EXTI line using HAL_EXTI_SetConfigLine().
(++) Choose the interrupt line number by setting "Line" member from
EXTI_ConfigTypeDef structure.
(++) Configure the interrupt and/or event mode using "Mode" member from
EXTI_ConfigTypeDef structure.
(++) For configurable lines, configure rising and/or falling trigger
"Trigger" member from EXTI_ConfigTypeDef structure.
(++) For Exti lines linked to gpio, choose gpio port using "GPIOSel"
member from GPIO_InitTypeDef structure.
(#) Get current Exti configuration of a dedicated line using
HAL_EXTI_GetConfigLine().
(++) Provide exiting handle as parameter.
(++) Provide pointer on EXTI_ConfigTypeDef structure as second parameter.
(#) Clear Exti configuration of a dedicated line using HAL_EXTI_ClearConfigLine().
(++) Provide exiting handle as parameter.
(#) Register callback to treat Exti interrupts using HAL_EXTI_RegisterCallback().
(++) Provide exiting handle as first parameter.
(++) Provide which callback will be registered using one value from
EXTI_CallbackIDTypeDef.
(++) Provide callback function pointer.
(#) Get interrupt pending bit using HAL_EXTI_GetPending().
(#) Clear interrupt pending bit using HAL_EXTI_ClearPending().
(#) Generate software interrupt using HAL_EXTI_GenerateSWI().
@endverbatim
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
/** @addtogroup STM32F4xx_HAL_Driver
* @{
*/
/** @addtogroup EXTI
* @{
*/
/** MISRA C:2012 deviation rule has been granted for following rule:
* Rule-18.1_b - Medium: Array `EXTICR' 1st subscript interval [0,7] may be out
* of bounds [0,3] in following API :
* HAL_EXTI_SetConfigLine
* HAL_EXTI_GetConfigLine
* HAL_EXTI_ClearConfigLine
*/
#ifdef HAL_EXTI_MODULE_ENABLED
/* Private typedef -----------------------------------------------------------*/
/* Private defines -----------------------------------------------------------*/
/** @defgroup EXTI_Private_Constants EXTI Private Constants
* @{
*/
/**
* @}
*/
/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/** @addtogroup EXTI_Exported_Functions
* @{
*/
/** @addtogroup EXTI_Exported_Functions_Group1
* @brief Configuration functions
*
@verbatim
===============================================================================
##### Configuration functions #####
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Set configuration of a dedicated Exti line.
* @param hexti Exti handle.
* @param pExtiConfig Pointer on EXTI configuration to be set.
* @retval HAL Status.
*/
HAL_StatusTypeDef HAL_EXTI_SetConfigLine(EXTI_HandleTypeDef *hexti, EXTI_ConfigTypeDef *pExtiConfig)
{
uint32_t regval;
uint32_t linepos;
uint32_t maskline;
/* Check null pointer */
if ((hexti == NULL) || (pExtiConfig == NULL))
{
return HAL_ERROR;
}
/* Check parameters */
assert_param(IS_EXTI_LINE(pExtiConfig->Line));
assert_param(IS_EXTI_MODE(pExtiConfig->Mode));
/* Assign line number to handle */
hexti->Line = pExtiConfig->Line;
/* Compute line mask */
linepos = (pExtiConfig->Line & EXTI_PIN_MASK);
maskline = (1uL << linepos);
/* Configure triggers for configurable lines */
if ((pExtiConfig->Line & EXTI_CONFIG) != 0x00u)
{
assert_param(IS_EXTI_TRIGGER(pExtiConfig->Trigger));
/* Configure rising trigger */
/* Mask or set line */
if ((pExtiConfig->Trigger & EXTI_TRIGGER_RISING) != 0x00u)
{
EXTI->RTSR |= maskline;
}
else
{
EXTI->RTSR &= ~maskline;
}
/* Configure falling trigger */
/* Mask or set line */
if ((pExtiConfig->Trigger & EXTI_TRIGGER_FALLING) != 0x00u)
{
EXTI->FTSR |= maskline;
}
else
{
EXTI->FTSR &= ~maskline;
}
/* Configure gpio port selection in case of gpio exti line */
if ((pExtiConfig->Line & EXTI_GPIO) == EXTI_GPIO)
{
assert_param(IS_EXTI_GPIO_PORT(pExtiConfig->GPIOSel));
assert_param(IS_EXTI_GPIO_PIN(linepos));
regval = SYSCFG->EXTICR[linepos >> 2u];
regval &= ~(SYSCFG_EXTICR1_EXTI0 << (SYSCFG_EXTICR1_EXTI1_Pos * (linepos & 0x03u)));
regval |= (pExtiConfig->GPIOSel << (SYSCFG_EXTICR1_EXTI1_Pos * (linepos & 0x03u)));
SYSCFG->EXTICR[linepos >> 2u] = regval;
}
}
/* Configure interrupt mode : read current mode */
/* Mask or set line */
if ((pExtiConfig->Mode & EXTI_MODE_INTERRUPT) != 0x00u)
{
EXTI->IMR |= maskline;
}
else
{
EXTI->IMR &= ~maskline;
}
/* Configure event mode : read current mode */
/* Mask or set line */
if ((pExtiConfig->Mode & EXTI_MODE_EVENT) != 0x00u)
{
EXTI->EMR |= maskline;
}
else
{
EXTI->EMR &= ~maskline;
}
return HAL_OK;
}
/**
* @brief Get configuration of a dedicated Exti line.
* @param hexti Exti handle.
* @param pExtiConfig Pointer on structure to store Exti configuration.
* @retval HAL Status.
*/
HAL_StatusTypeDef HAL_EXTI_GetConfigLine(EXTI_HandleTypeDef *hexti, EXTI_ConfigTypeDef *pExtiConfig)
{
uint32_t regval;
uint32_t linepos;
uint32_t maskline;
/* Check null pointer */
if ((hexti == NULL) || (pExtiConfig == NULL))
{
return HAL_ERROR;
}
/* Check the parameter */
assert_param(IS_EXTI_LINE(hexti->Line));
/* Store handle line number to configuration structure */
pExtiConfig->Line = hexti->Line;
/* Compute line mask */
linepos = (pExtiConfig->Line & EXTI_PIN_MASK);
maskline = (1uL << linepos);
/* 1] Get core mode : interrupt */
/* Check if selected line is enable */
if ((EXTI->IMR & maskline) != 0x00u)
{
pExtiConfig->Mode = EXTI_MODE_INTERRUPT;
}
else
{
pExtiConfig->Mode = EXTI_MODE_NONE;
}
/* Get event mode */
/* Check if selected line is enable */
if ((EXTI->EMR & maskline) != 0x00u)
{
pExtiConfig->Mode |= EXTI_MODE_EVENT;
}
/* Get default Trigger and GPIOSel configuration */
pExtiConfig->Trigger = EXTI_TRIGGER_NONE;
pExtiConfig->GPIOSel = 0x00u;
/* 2] Get trigger for configurable lines : rising */
if ((pExtiConfig->Line & EXTI_CONFIG) != 0x00u)
{
/* Check if configuration of selected line is enable */
if ((EXTI->RTSR & maskline) != 0x00u)
{
pExtiConfig->Trigger = EXTI_TRIGGER_RISING;
}
/* Get falling configuration */
/* Check if configuration of selected line is enable */
if ((EXTI->FTSR & maskline) != 0x00u)
{
pExtiConfig->Trigger |= EXTI_TRIGGER_FALLING;
}
/* Get Gpio port selection for gpio lines */
if ((pExtiConfig->Line & EXTI_GPIO) == EXTI_GPIO)
{
assert_param(IS_EXTI_GPIO_PIN(linepos));
regval = SYSCFG->EXTICR[linepos >> 2u];
pExtiConfig->GPIOSel = (regval >> (SYSCFG_EXTICR1_EXTI1_Pos * (linepos & 0x03u))) & SYSCFG_EXTICR1_EXTI0;
}
}
return HAL_OK;
}
/**
* @brief Clear whole configuration of a dedicated Exti line.
* @param hexti Exti handle.
* @retval HAL Status.
*/
HAL_StatusTypeDef HAL_EXTI_ClearConfigLine(EXTI_HandleTypeDef *hexti)
{
uint32_t regval;
uint32_t linepos;
uint32_t maskline;
/* Check null pointer */
if (hexti == NULL)
{
return HAL_ERROR;
}
/* Check the parameter */
assert_param(IS_EXTI_LINE(hexti->Line));
/* compute line mask */
linepos = (hexti->Line & EXTI_PIN_MASK);
maskline = (1uL << linepos);
/* 1] Clear interrupt mode */
EXTI->IMR = (EXTI->IMR & ~maskline);
/* 2] Clear event mode */
EXTI->EMR = (EXTI->EMR & ~maskline);
/* 3] Clear triggers in case of configurable lines */
if ((hexti->Line & EXTI_CONFIG) != 0x00u)
{
EXTI->RTSR = (EXTI->RTSR & ~maskline);
EXTI->FTSR = (EXTI->FTSR & ~maskline);
/* Get Gpio port selection for gpio lines */
if ((hexti->Line & EXTI_GPIO) == EXTI_GPIO)
{
assert_param(IS_EXTI_GPIO_PIN(linepos));
regval = SYSCFG->EXTICR[linepos >> 2u];
regval &= ~(SYSCFG_EXTICR1_EXTI0 << (SYSCFG_EXTICR1_EXTI1_Pos * (linepos & 0x03u)));
SYSCFG->EXTICR[linepos >> 2u] = regval;
}
}
return HAL_OK;
}
/**
* @brief Register callback for a dedicated Exti line.
* @param hexti Exti handle.
* @param CallbackID User callback identifier.
* This parameter can be one of @arg @ref EXTI_CallbackIDTypeDef values.
* @param pPendingCbfn function pointer to be stored as callback.
* @retval HAL Status.
*/
HAL_StatusTypeDef HAL_EXTI_RegisterCallback(EXTI_HandleTypeDef *hexti, EXTI_CallbackIDTypeDef CallbackID, void (*pPendingCbfn)(void))
{
HAL_StatusTypeDef status = HAL_OK;
switch (CallbackID)
{
case HAL_EXTI_COMMON_CB_ID:
hexti->PendingCallback = pPendingCbfn;
break;
default:
status = HAL_ERROR;
break;
}
return status;
}
/**
* @brief Store line number as handle private field.
* @param hexti Exti handle.
* @param ExtiLine Exti line number.
* This parameter can be from 0 to @ref EXTI_LINE_NB.
* @retval HAL Status.
*/
HAL_StatusTypeDef HAL_EXTI_GetHandle(EXTI_HandleTypeDef *hexti, uint32_t ExtiLine)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(ExtiLine));
/* Check null pointer */
if (hexti == NULL)
{
return HAL_ERROR;
}
else
{
/* Store line number as handle private field */
hexti->Line = ExtiLine;
return HAL_OK;
}
}
/**
* @}
*/
/** @addtogroup EXTI_Exported_Functions_Group2
* @brief EXTI IO functions.
*
@verbatim
===============================================================================
##### IO operation functions #####
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Handle EXTI interrupt request.
* @param hexti Exti handle.
* @retval none.
*/
void HAL_EXTI_IRQHandler(EXTI_HandleTypeDef *hexti)
{
uint32_t regval;
uint32_t maskline;
/* Compute line mask */
maskline = (1uL << (hexti->Line & EXTI_PIN_MASK));
/* Get pending bit */
regval = (EXTI->PR & maskline);
if (regval != 0x00u)
{
/* Clear pending bit */
EXTI->PR = maskline;
/* Call callback */
if (hexti->PendingCallback != NULL)
{
hexti->PendingCallback();
}
}
}
/**
* @brief Get interrupt pending bit of a dedicated line.
* @param hexti Exti handle.
* @param Edge Specify which pending edge as to be checked.
* This parameter can be one of the following values:
* @arg @ref EXTI_TRIGGER_RISING_FALLING
* This parameter is kept for compatibility with other series.
* @retval 1 if interrupt is pending else 0.
*/
uint32_t HAL_EXTI_GetPending(EXTI_HandleTypeDef *hexti, uint32_t Edge)
{
uint32_t regval;
uint32_t linepos;
uint32_t maskline;
/* Check parameters */
assert_param(IS_EXTI_LINE(hexti->Line));
assert_param(IS_EXTI_CONFIG_LINE(hexti->Line));
assert_param(IS_EXTI_PENDING_EDGE(Edge));
/* Compute line mask */
linepos = (hexti->Line & EXTI_PIN_MASK);
maskline = (1uL << linepos);
/* return 1 if bit is set else 0 */
regval = ((EXTI->PR & maskline) >> linepos);
return regval;
}
/**
* @brief Clear interrupt pending bit of a dedicated line.
* @param hexti Exti handle.
* @param Edge Specify which pending edge as to be clear.
* This parameter can be one of the following values:
* @arg @ref EXTI_TRIGGER_RISING_FALLING
* This parameter is kept for compatibility with other series.
* @retval None.
*/
void HAL_EXTI_ClearPending(EXTI_HandleTypeDef *hexti, uint32_t Edge)
{
uint32_t maskline;
/* Check parameters */
assert_param(IS_EXTI_LINE(hexti->Line));
assert_param(IS_EXTI_CONFIG_LINE(hexti->Line));
assert_param(IS_EXTI_PENDING_EDGE(Edge));
/* Compute line mask */
maskline = (1uL << (hexti->Line & EXTI_PIN_MASK));
/* Clear Pending bit */
EXTI->PR = maskline;
}
/**
* @brief Generate a software interrupt for a dedicated line.
* @param hexti Exti handle.
* @retval None.
*/
void HAL_EXTI_GenerateSWI(EXTI_HandleTypeDef *hexti)
{
uint32_t maskline;
/* Check parameters */
assert_param(IS_EXTI_LINE(hexti->Line));
assert_param(IS_EXTI_CONFIG_LINE(hexti->Line));
/* Compute line mask */
maskline = (1uL << (hexti->Line & EXTI_PIN_MASK));
/* Generate Software interrupt */
EXTI->SWIER = maskline;
}
/**
* @}
*/
/**
* @}
*/
#endif /* HAL_EXTI_MODULE_ENABLED */
/**
* @}
*/
/**
* @}
*/
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