我在PWM设置1通道为输出，在程序仿真时波形正常，下载进去就没有波形了，求大神指教！

1. TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
   
2.         TIM_OCInitTypeDef  TIM_OCInitStructure;
   
3. 
   
4.   /* Enable TIM1 clock */  
   
5.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //TIM1
   
6.   
   
7.   // Time Base configuration，定时器初始化
   
8.   TIM_TimeBaseStructure.TIM_Period = 1000-1;      //定时时间：50*10us=500us
   
9.   TIM_TimeBaseStructure.TIM_Prescaler = 0;  // 720/72 = 10us,定时器周期
   
10.   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //0
    
11.   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    
12. 
    
13.   // TIM1 configure
    
14.   TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);    //初始化定时器1
    
15. 
    
16.   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    
17.   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
18.   //TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    
19.   TIM_OCInitStructure.TIM_Pulse = 750;
    
20.   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
    
21.   //TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    
22.   //TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    
23. // TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
    
24. 
    
25.   TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    
26.   TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
    
27.   /* TIM1 Main Output Enable
    
28.    TIM1 counter enable */
    
29.   TIM_Cmd(TIM1, ENABLE);

复制代码

zhahl 发表于 2016-12-23 17:49

这是代码

你好像没有使能相关的GPIO口呀。

能在仿真时出现正确的波形，但是在硬件上没有，这个还是硬件的问题，看看你的硬件是否连线正常，先测试下相应的基本功能。再根据出现的情况一步一步分析。

仿真是有点区别。还是按实际的用吧

  /* System Clocks Configuration */
  RCC_Configuration();

  /* GPIO Configuration */
  GPIO_Configuration();

  /* TIM1 Configuration ---------------------------------------------------
   TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock
   SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density
   and Connectivity line devices and to 24 MHz for Low-Density Value line and
   Medium-Density Value line devices
   
   The objective is to generate 7 PWM signal at 17.57 KHz:
     - TIM1_Period = (SystemCoreClock / 17570) - 1
   The channel 1 and channel 1N duty cycle is set to 50%
   The Timer pulse is calculated as follows:
     - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100
  ----------------------------------------------------------------------- */
  /* Compute the value to be set in ARR regiter to generate signal frequency at 17.57 Khz */
  TimerPeriod = (SystemCoreClock / 17570 ) - 1;
  /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */
  Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  /* Channel 1 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  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);

  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);

  /* TIM1 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
--------------------------------------------------------------------
以上是官方例程，请参考！
楼主确实IO初始化和  TIM_CtrlPWMOutputs(TIM1, ENABLE);
不妨试试！
另外，仿真和脱机运行会不一致是正常的！