Stm32 timer interrupt makes LED light blink

Knowledge points:

Stm32 has a total of 11 timers:

1. Two advanced timers: TIM1, TIM8-------------------------APB2

2. Four general timers: TIM2~TIM5-------------------------APB1

3. Two basic timers: TIM6, TIM7-------------------------APB1

4. Two watchdogs

5. A SysTick timer

Main program main.c:

/* 

*illustrate: 

*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 and USART3 are both on APB1 and USART1 is on APB2  

  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; //Frequency: 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)//Configure interrupt priority    

{    

  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);    

}    

Interrupt function 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);  

  }  

}  

Interrupt function declaration header file 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 */  

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