کد:
/**
*****************************************************************************
* @title EXTI_Exp.c
* @author CooCox
* @date 12 Nov 2013
* @brief This example shows how to configure an external interrupt line.
*
In this example, the EXTI line 9 is configured to generate an i
* nterrupt on each rising or falling edge , we Connect EXTI Line9
* to PC9, When the PC9 is connected to the GND through a wire, EXT
* I Line9 interrupt occur. In the interrupt routine, LED PB8 will
* blink 3 times. This example has been tested on MCBSTM32, STM32F1
* 03RB device.
*******************************************************************************
*/
////// The above comment is automatically generated by CoIDE ///////////////////
/**
******************************************************************************
* @file EXTI/EXTI_Exp/main.c
* @author MCD Application Team
* @version V1.0.0
* @date 30-October-2010
* @brief Main program body
******************************************************************************
* @attention
*
* 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.
*
* <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_exti.h"
#include "stm32f10x_flash.h"
#include "misc.h"
#define EXTI9_5_IRQChannel ((u8)0x17) // External Line[9:5] Interrupts
#define LED_PORT GPIOB
//***************************************************************************
//
// Global variables
//
// **************************************************************************
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
ErrorStatus HSEStartUpStatus;
//***************************************************************************
//
// Declare function prototype
//
// **************************************************************************
void Delay(__IO uint32_t);
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
//***************************************************************************
//
//This example shows how to configure an external interrupt line.
//
// **************************************************************************
int main(void)
{
//
// System Clocks Configuration
//
RCC_Configuration();
//
// NVIC configuration
//
NVIC_Configuration();
//
// Configure the GPIO ports
//
GPIO_Configuration();
//
// Connect EXTI Line9 to PC9
//
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource9);
//
// Configure EXTI Line9 to generate an interrupt on rising or falling edge
//
EXTI_InitStructure.EXTI_Line = EXTI_Line9;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
while (1)
{
}
return 0 ;
}
//***************************************************************************
//
//Configures the different system clocks.
//
// **************************************************************************
void RCC_Configuration(void)
{
//
// RCC system reset(for debug purpose)
//
RCC_DeInit();
//
// Enable HSE
//
RCC_HSEConfig(RCC_HSE_ON);
//
// Wait till HSE is ready
//
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if (HSEStartUpStatus == SUCCESS)
{
//
// HCLK = SYSCLK
//
RCC_HCLKConfig(RCC_SYSCLK_Div1);
//
// PCLK2 = HCLK
//
RCC_PCLK2Config(RCC_HCLK_Div1);
//
// PCLK1 = HCLK/2
//
RCC_PCLK1Config(RCC_HCLK_Div2);
//
// Flash 2 wait state
//
FLASH_SetLatency(FLASH_Latency_2);
//
// Enable Prefetch Buffer
//
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
//
// PLLCLK = 8MHz * 9 = 72 MHz
//
RCC_PLLConfig(0x00010000, RCC_PLLMul_9);
//
//Enable PLL
//
RCC_PLLCmd(ENABLE);
//
//Wait till PLL is ready
//
while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
//
// Select PLL as system clock source
//
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//
// Wait till PLL is used as system clock source
//
while (RCC_GetSYSCLKSource() != 0x08)
{
}
}
//
// Enable GPIOB, GPIOC and AFIO clock
//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC
| RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
}
//***************************************************************************
//
//Configures the different GPIO ports.
//
//***************************************************************************
void GPIO_Configuration(void)
{
//
// Configure PC9 as input floating (EXTI Line9)
//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
//***************************************************************************
//
//Configure the nested vectored interrupt controller.
//
//***************************************************************************
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
//
// Set the Vector Table base location at 0x08000000
//
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
//
// Configure one bit for preemption priority
//
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
//
// Enable the EXTI9_5 Interrupt
//
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//**************************************************************************
//
//Inserts a delay time.
//
//**************************************************************************
void Delay(__IO uint32_t nCount)
{
for (; nCount != 0; nCount--);
}
//**************************************************************************
//
//This function handles External lines 9 to 5 interrupt request.
//
//**************************************************************************
void EXTI9_5_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line9) != RESET)
{
Delay(0xFFFFF);
GPIO_WriteBit(LED_PORT, GPIO_Pin_8, Bit_SET);
Delay(0xFFFFF);
GPIO_WriteBit(LED_PORT, GPIO_Pin_8, Bit_RESET);
Delay(0xFFFFF);
GPIO_WriteBit(LED_PORT, GPIO_Pin_8, Bit_SET);
Delay(0xFFFFF);
GPIO_WriteBit(LED_PORT, GPIO_Pin_8, Bit_RESET);
Delay(0xFFFFF);
GPIO_WriteBit(LED_PORT, GPIO_Pin_8, Bit_SET);
Delay(0xFFFFF);
GPIO_WriteBit(LED_PORT, GPIO_Pin_8, Bit_RESET);
//
//Clear the EXTI line 9 pending bit
//
EXTI_ClearITPendingBit(EXTI_Line9);
}
}
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