Stm32定时器中断使LED灯闪烁

知识点：

Stm32共有11个定时器：

1.两个高级定时器：TIM1、TIM8-------------------------APB2

2.四个通用定时器：TIM2～TIM5-------------------------APB1

3.两个基本定时器：TIM6、TIM7-------------------------APB1

4.两个看门狗

5.一个系统嘀嗒定时器（SysTick）

主程序main.c:

/*
*说明：
*PA0:KEY1;PA1:KEY2;
*PA2:LED1;PA3:LED2;
*PA9:USART1_TX;PA10:USART1_RX
*/
#include "stm32f10x.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_tim.h"
#include "stm32f10x_exti.h"
#include "system_stm32f10x.h"
#include "misc.h"

void RCC_Configuration(void);
void GPIO_Configuration(void); 
void TIM3_Configuration(void);
void NVIC_Configuration(void);

int main()
{
    SystemInit();
    
    RCC_Configuration();
    GPIO_Configuration(); 
    TIM3_Configuration();
    NVIC_Configuration();
                                                            
    while(1);
}

void RCC_Configuration(void)  
{   
  ////USART2和USART3都在在APB1上而USART1是在APB2上的
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);   
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);   
} 

void GPIO_Configuration(void)  
{  
  GPIO_InitTypeDef GPIO_InitStructure;  
  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;  
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure); 
}

void TIM3_Configuration(void)  
{
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  
  TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
  
  TIM_TimeBaseStructure.TIM_Period = 2000;//频率：72MHz  72000000/36000=2000
  TIM_TimeBaseStructure.TIM_Prescaler = 35999;//36000-1=35999
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
  
  TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE );
  TIM_Cmd(TIM3,ENABLE);
}

void NVIC_Configuration(void)//配置中断优先级  
{  
  NVIC_InitTypeDef NVIC_InitStructure;  
    
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);  
    
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;  
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
  NVIC_Init(&NVIC_InitStructure);  
}  

中断函数stm32f10x_it.c

#include "..\include\stm32f10x.h" 
#include "..\include\stm32f10x_it.h"
#include "..\include\stm32f10x_gpio.h"
#include "..\include\stm32f10x_tim.h"

void TIM3_IRQHandler(void)
{
  TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
  
  if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_2)==Bit_RESET)
  {
    GPIO_SetBits(GPIOA,GPIO_Pin_2);
  }else{
    GPIO_ResetBits(GPIOA,GPIO_Pin_2);
  }
}

中断函数声明头文件stm32f10x_it.h：

#ifndef __STM32F10x_IT_H
#define __STM32F10x_IT_H

/* Includes ------------------------------------------------------------------*/
/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */  
void NMIException(void);
void HardFaultException(void);
void MemManageException(void);
void BusFaultException(void);
void UsageFaultException(void);
void DebugMonitor(void);
void SVCHandler(void);
void PendSVC(void);
void SysTickHandler(void);
void WWDG_IRQHandler(void);
void PVD_IRQHandler(void);
void TAMPER_IRQHandler(void);
void RTC_IRQHandler(void);
void FLASH_IRQHandler(void);
void RCC_IRQHandler(void);
void EXTI0_IRQHandler(void);
void EXTI1_IRQHandler(void);
void EXTI2_IRQHandler(void);
void EXTI3_IRQHandler(void);
void EXTI4_IRQHandler(void);
void DMA1_Channel1_IRQHandler(void);
void DMA1_Channel2_IRQHandler(void);
void DMA1_Channel3_IRQHandler(void);
void DMA1_Channel4_IRQHandler(void);
void DMA1_Channel5_IRQHandler(void);
void DMA1_Channel6_IRQHandler(void);
void DMA1_Channel7_IRQHandler(void);
void ADC1_2_IRQHandler(void);
void USB_HP_CAN_TX_IRQHandler(void);
void USB_LP_CAN_RX0_IRQHandler(void);
void CAN_RX1_IRQHandler(void);
void CAN_SCE_IRQHandler(void);
void EXTI9_5_IRQHandler(void);
void TIM1_BRK_IRQHandler(void);
void TIM1_UP_IRQHandler(void);
void TIM1_TRG_COM_IRQHandler(void);
void TIM1_CC_IRQHandler(void);
void TIM2_IRQHandler(void);
void TIM3_IRQHandler(void);
void TIM4_IRQHandler(void);
void I2C1_EV_IRQHandler(void);
void I2C1_ER_IRQHandler(void);
void I2C2_EV_IRQHandler(void);
void I2C2_ER_IRQHandler(void);
void SPI1_IRQHandler(void);
void SPI2_IRQHandler(void);
void USART1_IRQHandler(void);
void USART2_IRQHandler(void);
void USART3_IRQHandler(void);
void EXTI15_10_IRQHandler(void);
void RTCAlarm_IRQHandler(void);
void USBWakeUp_IRQHandler(void);
void TIM8_BRK_IRQHandler(void);
void TIM8_UP_IRQHandler(void);
void TIM8_TRG_COM_IRQHandler(void);
void TIM8_CC_IRQHandler(void);
void ADC3_IRQHandler(void);
void FSMC_IRQHandler(void);
void SDIO_IRQHandler(void);
void TIM5_IRQHandler(void);
void SPI3_IRQHandler(void);
void UART4_IRQHandler(void);
void UART5_IRQHandler(void);
void TIM6_IRQHandler(void);
void TIM7_IRQHandler(void);
void DMA2_Channel1_IRQHandler(void);
void DMA2_Channel2_IRQHandler(void);
void DMA2_Channel3_IRQHandler(void);
void DMA2_Channel4_5_IRQHandler(void);
					 
#endif /* __STM32F10x_IT_H */

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/