本人刚接触STM32，希望大侠们指教，谢谢！
按键外部中断进不去，用的3.4的固件库，按键为下降沿中断方式，接在mcu的PC13口，程序实现功能为LED起初循环点亮，按键按下时，执行中断程序，其中LED由PF口控制，如下
/*******************************************************************************
* File Name : main.c
* Author : Nanjing
* Date First Issued : 04/12/2011
* Description : Main program body
********************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "main.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static __IO uint32_t TimingDelay;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
ErrorStatus HSEStartUpStatus;
/* Private function prototypes -----------------------------------------------*/
void Delay(__IO uint32_t nTime);
void RCC_Configuration(void) ;
void SysTick_Configuration(void);
void GPIO_Configuration(void);
void EXTI_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug() ;
#endif
/* Setup SysTick Timer for 1 msec interrupts */
/* Configure the system clocks */
RCC_Configuration();
SysTick_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
EXTI_Configuration();
/***循环点亮LED****/
for(;;)
{
GPIOF->ODR=0xfffffc4f;
/* Insert 50 ms delay */
Delay(500);
GPIOF->ODR=0xfffffc8f;
/* Insert 50 ms delay */
Delay(500);
GPIOF->ODR=0xfffffd0f;
/* Insert 50 ms delay */
Delay(500);
GPIOF->ODR=0xfffffe0f;
/* Insert 50 ms delay */
Delay(500);
}
}
/**
* @brief Inserts a delay time.
* @param nTime: specifies the delay time length, in milliseconds.
* @retval None
*/
void SysTick_Configuration(void)
{
/* Setup SysTick Timer for 100 msec interrupts */
if (SysTick_Config((SystemCoreClock) / 1000)) // 1/1000s=1ms
{
/* Capture error */
while (1);
}
NVIC_SetPriority(SysTick_IRQn, 0x0);
}
void Delay(__IO uint32_t nTime) //定义nTime为可读可写的int
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
/**
* @brief Decrements the TimingDelay variable.
* @param None
* @retval None
*/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM,0x0);
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH,0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel=EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void RCC_Configuration(void)
{
//必须开时钟才能 使用起来 相应IO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO,ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
/*配置PF口为输出推免，速度50MHz*/
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_Init(GPIOF,&GPIO_InitStructure);
/* Configure PC13 as input floating (EXTI Line13) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void EXTI_Configuration(void)
{
/* Configure EXTI Line13 to generate an interrupt on falling edge */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource13); //选择中断管脚PC13
EXTI_InitStructure.EXTI_Line=EXTI_Line13;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd=ENABLE;
EXTI_Init(&EXTI_InitStructure);
}
/*******************************************************************************
* Function Name : Delay
* Description : Inserts a delay time.
* Input : nCount: specifies the delay time length.
* Output : None
* Return : None
*******************************************************************************/
#ifdef DEBUG
/*描述：当程序出错时，返回出错的文件名及在源程序中的行号
输入：—file：指向文件名的指针
—line：在源程序中的行号
输出：无
返回：无
*/
void assert_failed(u8*file,u32 line)
{
while(1) {}
}
#endif
以下为用到的中断程序:
void SysTick_Handler(void)
{
TimingDelay_Decrement();
}
void EXTI15_10_IRQHandler(void)
{ int i;
if(EXTI_GetITStatus(EXTI_Line13)!=RESET)
{
//二极管全部熄灭
for(i=0;i<8000000;i++)
GPIOF->ODR=0xfffffc3f;
// /* Insert 50 ms delay */
// Delay(500);
//二极管全部点亮
for(i=0;i<2000000;i++)
GPIOF->ODR=0xffffffff;
// /* Insert 50 ms delay */
// Delay(500);
for(i=0;i<1000000;i++)
//清空中断标志位，防止持续进入中断
EXTI_ClearITPendingBit(EXTI_Line13);
}
} |
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