嵌入式实验四

#include "stm32f10x.h"
#include <stdio.h>
#include <string.h>

void RCC_cfg(void);
void GPIO_cfg(void);
void NVIC_cfg(void);
void TIMER_cfg(void);

int main(void)
{
 RCC_cfg();
 GPIO_cfg();
 NVIC_cfg();
 TIMER_cfg();
 TIM_Cmd(TIM2,ENABLE);
 while(1);
}

void RCC_cfg(void)
{
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF,ENABLE);
}
void GPIO_cfg(void)
{
 GPIO_InitTypeDef GPIO_InitStructure;
 GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//
 GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
 GPIO_Init(GPIOF,&GPIO_InitStructure);
}

void NVIC_cfg(void)
{
 NVIC_InitTypeDef NVIC_InitStructure;
 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
 NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
 NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
 NVIC_Init(&NVIC_InitStructure);
}

void TIMER_cfg(void)
{
 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
 TIM_DeInit(TIM2);
 TIM_InternalClockConfig(TIM2);
 TIM_TimeBaseStructure.TIM_Prescaler=36000-1;
 TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
 TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
 TIM_TimeBaseStructure.TIM_Period=3000-1;
 TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);
 
 TIM_ClearFlag(TIM2,TIM_FLAG_Update);
 TIM_ARRPreloadConfig(TIM2,DISABLE);
 TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
}

void TIM2_IRQHandler(void)
{
 u8 ReadValue;
 if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET)
 {
  TIM_ClearITPendingBit(TIM2,TIM_FLAG_Update);
  ReadValue=GPIO_ReadOutputDataBit(GPIOF,GPIO_Pin_9);//
  if(ReadValue==0)
  {
   GPIO_SetBits(GPIOF,GPIO_Pin_9);
   //GPIO_ResetBits(GPIOF,GPIO_Pin_7);
  }
  else
  {
   GPIO_ResetBits(GPIOF,GPIO_Pin_9);
   //GPIO_SetBits(GPIOF,GPIO_Pin_7);
  }
 }
}