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