STM32的PWM发生不行！求助！！

只看该作者 · 2014-7-12 15:35

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

TIM_DeInit(TIM1);//初始化TIM1寄存器
//使能GPIO外设和AFIO复用功能模块时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOE  | RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE); //Timer1完全重映射  TIM1_CH1->PE9

   //设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形 GPIOE.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //TIM1_CH1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);//初始化GPIO
   //初始化TIM1
TIM_TimeBaseStructure.TIM_Period = 1000; //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 =0; //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_Up;  //TIM向上计数模式
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

//初始化TIM1 Channel1 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
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_OCInitStructure.TIM_Pulse = 500;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC1
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR1上的预装载寄存器

TIM_ARRPreloadConfig(TIM1, ENABLE);             //使能TIMx在ARR上的预装载寄存器
TIM_Cmd(TIM1, ENABLE);  //使能TIM1
TIM_CtrlPWMOutputs(TIM1, ENABLE);//设置PMW主输出

为什么我PE9不能产生PWM?不知道哪里有问题，有没有哪位大神帮我看下，香主帮我可以吗？我把这个放在SystemInit（）系统时钟初始化后面了，还是没有PWM产生。我单独控制PE9高低电平都可以。不知道哪里除了问题，就是不产生PWM。

只看该作者 · 2014-7-12 15:42

刚刚发现问题了，在这个函数前面我初始化了中断向量，
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_SetPriorityGrouping (5);//抢占式优先级(0~3),亚优先级(0~3)

//NVIC_SetPriority(SysTick_IRQn,NVIC_EncodePriority(5,0,1));
NVIC_InitStructure.NVIC_IRQChannel = SysTick_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the EXTI15_10 Interrupt tda7396 wrong*/
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
就是这个才不行，是什么原因？奇怪

3万 · 2014-7-12 18:26

/* -----------------------------------------------------------------------
TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
TIM3CLK = 18 MHz, Prescaler = 0x0, TIM3 counter clock = 36 MHz
TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)
TIM3 Frequency = 36 KHz.
TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%
  ----------------------------------------------------------------------- */
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 3000; //72000/(3599+1)
  TIM_TimeBaseStructure.TIM_Prescaler = 9;    // TIMCLK/2
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV4;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel-3*/
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 3000;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High ;
  TIM_OC3Init(TIM3, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel-4 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 3000;
  TIM_OC4Init(TIM3, &TIM_OCInitStructure);
  TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

  TIM_ARRPreloadConfig(TIM3, ENABLE);
  TIM_Cmd(TIM3, ENABLE);
发个F1你参考下；

STM32的PWM发生不行！求助！！

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