动态改变占空比加上刹车功能就有问题

我做了一个动态改变占空比的程序  现在要加上刹车功能  故障时封锁SPWM输出  
但是我一使能刹车   SPWM就出不来  
高手帮忙看一下  我哪设置不对吗
修给占空比我是在 TIM5的中断中做的


void Timeconfig(void)
{
/* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1 ;
  TIM_TimeBaseStructure.TIM_Period = TIM1_Period;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  //TIM_ARRPreloadConfig(TIM1, ENABLE);
  /* Channel 1,  Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 680;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  //死区设置
  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
  TIM_BDTRInitStructure.TIM_DeadTime = 20;  //这里调整死区大小0-0xff
  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
  TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
  TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
  //启用CCR1寄存器的影子寄存器（直到产生更新事件才更改设置）
  //TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Disable);
  //TIM1_OC2模块设置（设置2通道占空比）
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 680;
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);
  //启用CCR2寄存器的影子寄存器（直到产生更新事件才更改设置）
  //TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);

  
  TIM_TimeBaseStructure.TIM_Prescaler= 0;
  TIM_TimeBaseStructure.TIM_CounterMode= TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period= 4000;
  TIM_TimeBaseStructure.TIM_ClockDivision= 0;
  TIM_TimeBaseInit( TIM5, &TIM_TimeBaseStructure );
  TIM_ITConfig( TIM5, TIM_IT_Update, ENABLE );
  TIM_Cmd( TIM5, ENABLE );

  TIM_TimeBaseStructure.TIM_Prescaler= 719;
  TIM_TimeBaseStructure.TIM_CounterMode= TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period= 20;
  TIM_TimeBaseStructure.TIM_ClockDivision= 0;
  TIM_TimeBaseInit( TIM3, &TIM_TimeBaseStructure );
  TIM_SelectOutputTrigger( TIM3, TIM_TRGOSource_Update );// ADC Trigger  5KHz
  TIM_Cmd( TIM3, ENABLE );
  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);
  /* TIM1 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
}

TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
时  出来的SPWM只有180度的有

                                 你使能了刹车，此时应该是不需要输出PWM吧

                                 是的  现在问题解决了   硬件没有上拉电阻

                                 嗯，楼主还是说具体点，对我们也有点帮助

                                 就是刹车引脚

                                 刹车的时候,就是把电机的2端都接地.可以刹的很死!!!注意别把电源和地短了

                                 ？？？不是很明白

如题，程序里有两个功能，一是定时器1输出两路PWM，单独仿真和下载进去没有问题，都有输出；
二是通过定时器2周期性中断改变定时器1的脉宽，实现脉宽调节功能，加上这个功能后，仿真可以实现，下载后没输出
什么原因呢？
void TIM1_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
// NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //使能定时器3时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO
GPIO_ResetBits(GPIOA,GPIO_Pin_8|GPIO_Pin_9);

   //初始化TIM1
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;  //TIM向上计数模式
// TIM_TimeBaseStructure.TIM_RepetitionCounter = 10;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);

// TIM_ClearFlag(TIM1, TIM_FLAG_Update); //清中断，以免一启用中断后立即产生中断
// TIM_CtrlPWMOutputs(TIM1,ENABLE);
// TIM_Cmd(TIM1, ENABLE);  //使能TIM3

}

void TIM3_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能

TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 计数到5000为500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率  
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

TIM_Cmd(TIM3, ENABLE);  //使能TIMx外设

}

extern u16 Pulse1,Pulse2;
extern u16  Pulse_Add; // 5%

//定时器3中断服务程序
void TIM3_IRQHandler(void)   //TIM3中断
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx的中断待处理位:TIM 中断源

if(Pulse_Add==0)
{ TIM_SetCompare1(TIM1,500);
   TIM_SetCompare2(TIM1,500);
}
else
{Pulse_Add=Pulse_Add-25;
    Pulse1=500+Pulse_Add;
    Pulse2=500-Pulse_Add;
TIM_SetCompare1(TIM1,Pulse1);
    TIM_SetCompare2(TIM1,Pulse2);
}
}
// TIM_CtrlPWMOutputs(TIM1,ENABLE);
// TIM_Cmd(TIM1, ENABLE);  //使能TIM3

}

u16  Pulse1,Pulse2;
int main(void)
{
// u16 led0pwmval=0;
// u8 dir=1;
delay_init();     //延时函数初始化  
NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
// uart_init(9600); //串口初始化为9600
// LED_Init();     //LED端口初始化
// TIM3_PWM_Init(899,0); //不分频。PWM频率=72000/900=8Khz
    TIM3_Int_Init(999,7199);
  TIM1_PWM_Init(999,0);        //预分频9，PWM频率=72000000/1000=72khz    定时器输出频率的计算公式：f(OC1) = 72,000,000 / (ARR - 1)*(PSC - 1);
TIM_SetCompare1(TIM1,500+475);
TIM_SetCompare2(TIM1,500-475);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
TIM_Cmd(TIM1, ENABLE);
TIM_Cmd(TIM3, ENABLE);
    while(1)
  {  }
}