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rt-thread-official/bsp/stm32/library/src/stm32f10x_exti.c

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/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_exti.c
* Author : MCD Application Team
* Version : V2.0.3
* Date : 09/22/2008
* Description : This file provides all the EXTI firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_exti.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define EXTI_LineNone ((u32)0x00000) /* No interrupt selected */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : EXTI_DeInit
* Description : Deinitializes the EXTI peripheral registers to their default
* reset values.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void EXTI_DeInit(void)
{
EXTI->IMR = 0x00000000;
EXTI->EMR = 0x00000000;
EXTI->RTSR = 0x00000000;
EXTI->FTSR = 0x00000000;
EXTI->PR = 0x0007FFFF;
}
/*******************************************************************************
* Function Name : EXTI_Init
* Description : Initializes the EXTI peripheral according to the specified
* parameters in the EXTI_InitStruct.
* Input : - EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
* that contains the configuration information for the EXTI
* peripheral.
* Output : None
* Return : None
*******************************************************************************/
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
{
/* 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(EXTI_InitStruct->EXTI_Line));
assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
{
/* Clear EXTI line configuration */
EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
*(vu32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Mode)|= EXTI_InitStruct->EXTI_Line;
/* Clear Rising Falling edge configuration */
EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
/* Select the trigger for the selected external interrupts */
if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
{
/* Rising Falling edge */
EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
}
else
{
*(vu32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Trigger)|= EXTI_InitStruct->EXTI_Line;
}
}
else
{
/* Disable the selected external lines */
*(vu32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Mode)&= ~EXTI_InitStruct->EXTI_Line;
}
}
/*******************************************************************************
* Function Name : EXTI_StructInit
* Description : Fills each EXTI_InitStruct member with its reset value.
* Input : - EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
* which will be initialized.
* Output : None
* Return : 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_Falling;
EXTI_InitStruct->EXTI_LineCmd = DISABLE;
}
/*******************************************************************************
* Function Name : EXTI_GenerateSWInterrupt
* Description : Generates a Software interrupt.
* Input : - EXTI_Line: specifies the EXTI lines to be enabled or
* disabled.
* This parameter can be any combination of EXTI_Linex where
* x can be (0..18).
* Output : None
* Return : None
*******************************************************************************/
void EXTI_GenerateSWInterrupt(u32 EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->SWIER |= EXTI_Line;
}
/*******************************************************************************
* Function Name : EXTI_GetFlagStatus
* Description : Checks whether the specified EXTI line flag is set or not.
* Input : - EXTI_Line: specifies the EXTI line flag to check.
* This parameter can be:
* - EXTI_Linex: External interrupt line x where x(0..18)
* Output : None
* Return : The new state of EXTI_Line (SET or RESET).
*******************************************************************************/
FlagStatus EXTI_GetFlagStatus(u32 EXTI_Line)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_GET_EXTI_LINE(EXTI_Line));
if ((EXTI->PR & EXTI_Line) != (u32)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : EXTI_ClearFlag
* Description : Clears the EXTI<54>s line pending flags.
* Input : - EXTI_Line: specifies the EXTI lines flags to clear.
* This parameter can be any combination of EXTI_Linex where
* x can be (0..18).
* Output : None
* Return : None
*******************************************************************************/
void EXTI_ClearFlag(u32 EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->PR = EXTI_Line;
}
/*******************************************************************************
* Function Name : EXTI_GetITStatus
* Description : Checks whether the specified EXTI line is asserted or not.
* Input : - EXTI_Line: specifies the EXTI line to check.
* This parameter can be:
* - EXTI_Linex: External interrupt line x where x(0..18)
* Output : None
* Return : The new state of EXTI_Line (SET or RESET).
*******************************************************************************/
ITStatus EXTI_GetITStatus(u32 EXTI_Line)
{
ITStatus bitstatus = RESET;
u32 enablestatus = 0;
/* Check the parameters */
assert_param(IS_GET_EXTI_LINE(EXTI_Line));
enablestatus = EXTI->IMR & EXTI_Line;
if (((EXTI->PR & EXTI_Line) != (u32)RESET) && (enablestatus != (u32)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : EXTI_ClearITPendingBit
* Description : Clears the EXTI<54>s line pending bits.
* Input : - EXTI_Line: specifies the EXTI lines to clear.
* This parameter can be any combination of EXTI_Linex where
* x can be (0..18).
* Output : None
* Return : None
*******************************************************************************/
void EXTI_ClearITPendingBit(u32 EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->PR = EXTI_Line;
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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