这两个定时器初始化有什么区别啊

bboy110

void TIM_Config(void)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
        /* TIM3 clock enable */
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);       
       
        /* Time base configuration */
        TIM_TimeBaseStructure.TIM_Period = 50000;
        TIM_TimeBaseStructure.TIM_Prescaler = 0;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
        //TIM3预分频设置:1MHZ,APB1分频系数2，TIM3时钟为36MHzx2 = 72MHz  
        TIM_PrescalerConfig(TIM3,71, TIM_PSCReloadMode_Immediate);       
       
        //通用定时器TIM3中断配置
        TIM_ITConfig(TIM3,TIM_IT_Update, ENABLE);       
        /* TIM3 enable counter */
        TIM_Cmd(TIM3, ENABLE);

        /* Enable the TIM2 global Interrupt */
        NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);
}


void Tim_Init(void)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
         RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
       
        TIM_TimeBaseStructure.TIM_Period = 4999;
  TIM_TimeBaseStructure.TIM_Prescaler = 7199;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

        TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
       
       
       
          NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable the TIM3 global Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel =  TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
       
         TIM_Cmd(TIM3, ENABLE);

}

Electronic

自己对比啊，这个还要问，自己下载进入看看有什么不同