用那几个普通定时器产生单脉冲可行，改为高级定时器后，就没输出了。求解。下面是代码。

Y-Hanxiao · 发表于 2016-7-21 11:22:56

//主定时器TIM4
//从定时器TIM1

void TIM_pwm32Init(u16 TIMx_master_Period,u16 slave_pulse)
{

   GPIO_InitTypeDef  GPIO_InitStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
   TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE); //引脚时钟初始化
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //时钟使能

//从定时器引脚初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_11 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

  //主定时器初始化
  TIM_TimeBaseStructure.TIM_Period = TIMx_master_Period;          //定时器加载值
  TIM_TimeBaseStructure.TIM_Prescaler = 7199;                      //定时器分频值
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;       //计数加
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);                   //设置

TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);                //允许预装载
TIM_SelectOutputTrigger(TIM4, TIM_TRGOSource_Update);             //选择主定时器的级联输出信号为TRGO。
TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable);    //打开主定时器的主从模式

  //从定时器初始化
  TIM_TimeBaseStructure.TIM_Period = 10000;                         //定时器加载值
TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);                   //从定时器的时基定义

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;                //PWM1模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;    //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;       //高电平有效
TIM_OCInitStructure.TIM_Pulse = 10001-slave_pulse;                   //脉宽
TIM_OC1Init(TIM1, &TIM_OCInitStructure);                         //从定时器的CH1输出
TIM_OC2Init(TIM1, &TIM_OCInitStructure);                         //从定时器的CH1输出

   /* One Pulse Mode selection */
  TIM_SelectOnePulseMode(TIM1, TIM_OPMode_Single);

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);             //允许预装载
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);             //允许预装载

TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Trigger);             //从定时器的从模式选择,比如门控模式,触发模式等
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);    //打开主定时器的主从模式
TIM_SelectInputTrigger(TIM1, TIM_TS_ITR3);                      //选择从定时器为外部时钟触发.此行非常关键,必须执行

TIM_Cmd(TIM4, ENABLE);

}

憨厚诚实大叔 · 发表于 2016-7-21 11:22:57

高级定时器有个输出的总开关，应该是你总开关没开。MOE

void TIM_CtrlPWMOutputs(TIM_TypeDef* TIMx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST2_PERIPH(TIMx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
/* Enable the TIM Main Output */
TIMx->BDTR |= TIM_BDTR_MOE;
  }
  else
  {
/* Disable the TIM Main Output */
TIMx->BDTR &= (uint16_t)(~((uint16_t)TIM_BDTR_MOE));
  }
}