定时器设置时没有变量会无效？

hqzzzz

发现一个很神奇的事情……定时器设置时没有变量会无效；
列如：

void TIM1_Int_Init()
{

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

  GPIO_PinRemapConfig(GPIO_PartialRemap_TIM1, ENABLE);
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  TIM_TimeBaseStructure.TIM_Period =  127;//f=72MHz/2/(3600+1)=10K
  TIM_TimeBaseStructure.TIM_Prescaler = 0;//2分频
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  //TIM_TimeBaseStructure.TIM_RepetitionCounter=0;//重复寄存器，用于自动更新pwm占空比
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//设置输出极性
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; //空闲状态下得非工作模式

  //TIM_OCInitStructure.TIM_Pulse =0x0060;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
  /* TIM1 enable counter */
  TIM_Cmd(TIM1, ENABLE);
  TIM_CtrlPWMOutputs(TIM1, ENABLE);

}

上面代码是无法使用的
使用时：
TIM1_Int_Init();
定时器Tim3 200ms一次执行{
                if((LEDcount&0x7F)<120&&((LEDcount&0x80)==0x80))
                        LEDcount+=10;
                else if((LEDcount&0x7F)>0&&((LEDcount&0x80)==0x00))
                        LEDcount-=10;
                else
                        LEDcount^=0x80;

                TIM1->CCR1=LEDcount&0x7F；
}

但是
void TIM1_Int_Init(u16 ar)
{

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

  GPIO_PinRemapConfig(GPIO_PartialRemap_TIM1, ENABLE);
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  TIM_TimeBaseStructure.TIM_Period =  127;//f=72MHz/2/(3600+1)=10K
  TIM_TimeBaseStructure.TIM_Prescaler = 0;//2分频
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  //TIM_TimeBaseStructure.TIM_RepetitionCounter=0;//重复寄存器，用于自动更新pwm占空比
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//设置输出极性
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; //空闲状态下得非工作模式

  //TIM_OCInitStructure.TIM_Pulse =0x0060;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
  /* TIM1 enable counter */
  TIM_Cmd(TIM1, ENABLE);
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
}
使用时 ：
TIM1_Int_Init(120);
就可以做呼吸灯 运行…………   什么情况