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openblt/Target/Demo/ARMCM4_STM32F3_Nucleo_F303K.../Boot/lib/SPL/src/stm32f30x_exti.c

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/**
******************************************************************************
* @file stm32f30x_exti.c
* @author MCD Application Team
* @version V1.2.3
* @date 10-July-2015
* @brief This file provides firmware functions to manage the following
* functionalities of the EXTI peripheral:
* + Initialization and Configuration
* + Interrupts and flags management
*
@verbatim
===============================================================================
##### EXTI features #####
===============================================================================
[..] External interrupt/event lines are mapped as following:
(#) All available GPIO pins are connected to the 16 external
interrupt/event lines from EXTI0 to EXTI15.
(#) EXTI line 16 is connected to the PVD output
(#) EXTI line 17 is connected to the RTC Alarm event
(#) EXTI line 18 is connected to USB Device wakeup event
(#) EXTI line 19 is connected to the RTC Tamper and TimeStamp events
(#) EXTI line 20 is connected to the RTC wakeup event
(#) EXTI line 21 is connected to the Comparator 1 wakeup event
(#) EXTI line 22 is connected to the Comparator 2 wakeup event
(#) EXTI line 23 is connected to the I2C1 wakeup event
(#) EXTI line 24 is connected to the I2C2 wakeup event
(#) EXTI line 25 is connected to the USART1 wakeup event
(#) EXTI line 26 is connected to the USART2 wakeup event
(#) EXTI line 27 is reserved
(#) EXTI line 28 is connected to the USART3 wakeup event
(#) EXTI line 29 is connected to the Comparator 3 event
(#) EXTI line 30 is connected to the Comparator 4 event
(#) EXTI line 31 is connected to the Comparator 5 event
(#) EXTI line 32 is connected to the Comparator 6 event
(#) EXTI line 33 is connected to the Comparator 7 event
(#) EXTI line 34 is connected for thr UART4 wakeup event
(#) EXTI line 35 is connected for the UART5 wakeup event
##### How to use this driver #####
===============================================================================
[..] In order to use an I/O pin as an external interrupt source,
follow steps below:
(#) Configure the I/O in input mode using GPIO_Init().
(#) Select the input source pin for the EXTI line using
SYSCFG_EXTILineConfig().
(#) Select the mode(interrupt, event) and configure the trigger
selection (Rising, falling or both) using EXTI_Init(). For the
internal interrupt, the trigger selection is not needed
(the active edge is always the rising one).
(#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init().
(#) Optionally, you can generate a software interrupt using the function
EXTI_GenerateSWInterrupt().
[..]
(@) SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx
registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT 2015 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 "stm32f30x_exti.h"
/** @addtogroup STM32F30x_StdPeriph_Driver
* @{
*/
/** @defgroup EXTI
* @brief EXTI driver modules
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define EXTI_LINENONE ((uint32_t)0x00000) /* No interrupt selected */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @defgroup EXTI_Private_Functions
* @{
*/
/** @defgroup EXTI_Group1 Initialization and Configuration functions
* @brief Initialization and Configuration functions
*
@verbatim
===============================================================================
##### Initialization and Configuration functions #####
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Deinitializes the EXTI peripheral registers to their default reset
* values.
* @param None
* @retval None
*/
void EXTI_DeInit(void)
{
EXTI->IMR = 0x1F800000;
EXTI->EMR = 0x00000000;
EXTI->RTSR = 0x00000000;
EXTI->FTSR = 0x00000000;
EXTI->SWIER = 0x00000000;
EXTI->PR = 0xE07FFFFF;
EXTI->IMR2 = 0x0000000C;
EXTI->EMR2 = 0x00000000;
EXTI->RTSR2 = 0x00000000;
EXTI->FTSR2 = 0x00000000;
EXTI->SWIER2 = 0x00000000;
EXTI->PR2 = 0x00000003;
}
/**
* @brief Initializes the EXTI peripheral according to the specified
* parameters in the EXTI_InitStruct.
* EXTI_Line specifies the EXTI line (EXTI0....EXTI35).
* EXTI_Mode specifies which EXTI line is used as interrupt or an event.
* EXTI_Trigger selects the trigger. When the trigger occurs, interrupt
* pending bit will be set.
* EXTI_LineCmd controls (Enable/Disable) the EXTI line.
* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure that
* contains the configuration information for the EXTI peripheral.
* @retval None
*/
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
{
uint32_t tmp = 0;
/* Check the parameters */
assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
assert_param(IS_EXTI_LINE_ALL(EXTI_InitStruct->EXTI_Line));
assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
tmp = (uint32_t)EXTI_BASE;
if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
{
/* Clear EXTI line configuration */
*(__IO uint32_t *) (((uint32_t) &(EXTI->IMR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
*(__IO uint32_t *) (((uint32_t) &(EXTI->EMR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
tmp += EXTI_InitStruct->EXTI_Mode + (((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20);
*(__IO uint32_t *) tmp |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
tmp = (uint32_t)EXTI_BASE;
/* Clear Rising Falling edge configuration */
*(__IO uint32_t *) (((uint32_t) &(EXTI->RTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
*(__IO uint32_t *) (((uint32_t) &(EXTI->FTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
/* Select the trigger for the selected interrupts */
if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
{
/* Rising Falling edge */
*(__IO uint32_t *) (((uint32_t) &(EXTI->RTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
*(__IO uint32_t *) (((uint32_t) &(EXTI->FTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
}
else
{
tmp += EXTI_InitStruct->EXTI_Trigger + (((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20);
*(__IO uint32_t *) tmp |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
}
}
else
{
tmp += EXTI_InitStruct->EXTI_Mode + (((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20);
/* Disable the selected external lines */
*(__IO uint32_t *) tmp &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F));
}
}
/**
* @brief Fills each EXTI_InitStruct member with its reset value.
* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure which will
* be initialized.
* @retval None
*/
void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
{
EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStruct->EXTI_LineCmd = DISABLE;
}
/**
* @brief Generates a Software interrupt on selected EXTI line.
* @param EXTI_Line: specifies the EXTI line on which the software interrupt
* will be generated.
* This parameter can be any combination of EXTI_Linex where x can be (0..20).
* @retval None
*/
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE_EXT(EXTI_Line));
*(__IO uint32_t *) (((uint32_t) &(EXTI->SWIER)) + ((EXTI_Line) >> 5 ) * 0x20) |= (uint32_t)(1 << (EXTI_Line & 0x1F));
}
/**
* @}
*/
/** @defgroup EXTI_Group2 Interrupts and flags management functions
* @brief EXTI Interrupts and flags management functions
*
@verbatim
===============================================================================
##### Interrupts and flags management functions #####
===============================================================================
[..]
This section provides functions allowing to configure the EXTI Interrupts
sources and check or clear the flags or pending bits status.
@endverbatim
* @{
*/
/**
* @brief Checks whether the specified EXTI line flag is set or not.
* @param EXTI_Line: specifies the EXTI line flag to check.
* This parameter can be any combination of EXTI_Linex where x can be (0..20).
* @retval The new state of EXTI_Line (SET or RESET).
*/
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_GET_EXTI_LINE(EXTI_Line));
if ((*(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20)& (uint32_t)(1 << (EXTI_Line & 0x1F))) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/**
* @brief Clears the EXTI's line pending flags.
* @param EXTI_Line: specifies the EXTI lines flags to clear.
* This parameter can be any combination of EXTI_Linex where x can be (0..20).
* @retval None
*/
void EXTI_ClearFlag(uint32_t EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE_EXT(EXTI_Line));
*(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20) = (1 << (EXTI_Line & 0x1F));
}
/**
* @brief Checks whether the specified EXTI line is asserted or not.
* @param EXTI_Line: specifies the EXTI line to check.
* This parameter can be any combination of EXTI_Linex where x can be (0..20).
* @retval The new state of EXTI_Line (SET or RESET).
*/
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
{
ITStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_GET_EXTI_LINE(EXTI_Line));
if ((*(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20)& (uint32_t)(1 << (EXTI_Line & 0x1F))) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/**
* @brief Clears the EXTI's line pending bits.
* @param EXTI_Line: specifies the EXTI lines to clear.
* This parameter can be any combination of EXTI_Linex where x can be (0..20).
* @retval None
*/
void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE_EXT(EXTI_Line));
*(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20) = (1 << (EXTI_Line & 0x1F));
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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