STM32外部中断

1万 · 2016-3-23 10:49

主机:WIN7

开发环境:MDK4.23

MCU:STM32F103CBT6

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说明:

STM32有20个外部中断线,其中EXTI0-EXTI15给I/O端口使用

EXTI线16连接到PVD输出
EXTI线17连接到RTC闹钟事件
EXTI线18连接到USB唤醒事件
EXTI线19连接到以太网唤醒事件(只适用于互联型产品)

源代码:

初始化:

复制

//打开NTRX外部中断

void open_ntrx_irq(void)

{

        //定义中断结构体

        NVIC_InitTypeDef NVIC_InitStructure ;

        //定义外部中断结构体

        EXTI_InitTypeDef EXTI_InitStructure;

        //定义IO初始化结构体

        GPIO_InitTypeDef GPIO_InitStructure;

        

        //初始化NTRX中断脚PB1时钟

        RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;                                                

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;                     //设置为输入

        GPIO_Init(GPIOB, &GPIO_InitStructure);                          //GPIOB初始化

        //配置中断源为PB1

        GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource1);

        // 配置EXTI_Line1下降沿触发

        EXTI_ClearITPendingBit(EXTI_Line1);

        EXTI_InitStructure.EXTI_Line = EXTI_Line1;

        EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

        EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

        EXTI_InitStructure.EXTI_LineCmd = ENABLE;

        EXTI_Init(&EXTI_InitStructure);

        //打开NTRX中断

        NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;                                //通道设置为外部中断线0

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0f;         //中断占先等级0

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0f;           //中断响应优先级0

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                           //打开中断

        NVIC_Init(&NVIC_InitStructure);                                 //初始化

        

        //EXTI_Line1软件中断允许

        //EXTI_GenerateSWInterrupt(EXTI_Line1);

}

中断函数:

复制

//NTRX中断

void EXTI1_IRQHandler(void)

{

        if(EXTI_GetITStatus(EXTI_Line1) != RESET)

          {

            //清中断

            EXTI_ClearITPendingBit(EXTI_Line1);



                //中断标志置位

                Flag_IRQ.ntrx = 1;

          }

}

1万 · 2016-3-23 13:16

//打开NTRX中断
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn; //通道设置为外部中断线0
这个NTRX中断没有在百度找的，谁知道是不是写错了？

1万 · 2016-3-23 17:14

官方也有这种

复制

/**

  ******************************************************************************

  * [url=home.php?mod=space&uid=288409]@file[/url]    EXTI/main.c

  * [url=home.php?mod=space&uid=187600]@author[/url]  MCD Application Team

  * [url=home.php?mod=space&uid=895143]@version[/url] V1.0.1

  * [url=home.php?mod=space&uid=212281]@date[/url]    11-October-2013

  * [url=home.php?mod=space&uid=247401]@brief[/url]   Main program body

  ******************************************************************************

  * @attention

  *

  * <h2><center>© COPYRIGHT 2013 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 "stm32f0xx.h"

#include "stm32f0308_discovery.h"



/** @addtogroup STM32F0308_Discovery_Peripheral_Examples

  * @{

  */



/** @addtogroup EXTI_Example

  * @{

  */



/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

static void EXTI_Config(void);



/* Private functions ---------------------------------------------------------*/



/**

  * @brief  Main program.

  * @param  None

  * @retval None

  */

int main(void)

{

  /*!< At this stage the microcontroller clock setting is already configured, 

       this is done through SystemInit() function which is called from startup

       file (startup_stm32f0xx.s) before to branch to application main.

       To reconfigure the default setting of SystemInit() function, refer to

       system_stm32f0xx.c file

     */



  /* Initialize LEDs mounted on STM32F0-Discovery kit */

  STM_EVAL_LEDInit(LED3);

  STM_EVAL_LEDInit(LED4);



  /* Configure PA0 in interrupt mode */

  EXTI_Config();



  /* Generate software interrupt: simulate a falling edge applied on EXTI0 line */

  EXTI_GenerateSWInterrupt(EXTI_Line0);



  /* Infinite loop */

  while (1)

  {

  }

}



/**

  * @brief  Configure PA0 in interrupt mode

  * @param  None

  * @retval None

  */

static void EXTI_Config(void)

{

  EXTI_InitTypeDef   EXTI_InitStructure;

  GPIO_InitTypeDef   GPIO_InitStructure;

  NVIC_InitTypeDef   NVIC_InitStructure;

  

  /* Enable GPIOA clock */

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);



  /* Configure PA0 pin as input floating */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

  GPIO_Init(GPIOA, &GPIO_InitStructure);



  /* Enable SYSCFG clock */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  

  /* Connect EXTI0 Line to PA0 pin */

  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);



  /* Configure EXTI0 line */

  EXTI_InitStructure.EXTI_Line = EXTI_Line0;

  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

  EXTI_InitStructure.EXTI_LineCmd = ENABLE;

  EXTI_Init(&EXTI_InitStructure);



  /* Enable and set EXTI0 Interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

}





#ifdef  USE_FULL_ASSERT



/**

  * @brief  Reports the name of the source file and the source line number

  *         where the assert_param error has occurred.

  * @param  file: pointer to the source file name

  * @param  line: assert_param error line source number

  * @retval None

  */

void assert_failed(uint8_t* file, uint32_t line)

{

  /* User can add his own implementation to report the file name and line number,

     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */



  /* Infinite loop */

  while (1)

  {

  }

}

#endif



/**

  * @}

  */



/**

  * @}

  */



/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/