PWM输出

只看该作者 · 2017-11-16 16:21

使用STM32F407VET6单片机使用定时器3输出PWM波没有波形，请朋友帮忙，多谢！

只看该作者 · 2017-11-16 16:22

void TIM4_PWM_Init(u32 arr,u32 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

GPIO_PinAFConfig(GPIOC,GPIO_PinSource13,GPIO_AF_TIM3);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC,&GPIO_InitStructure);

//  GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_TIM4);

TIM3->EGR |= 1;

TIM_TimeBaseStructure.TIM_Prescaler=psc;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=arr;

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_Pulse = arr/2;
// TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
//  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;//????,TIM_OCNPolarity_High?????
//  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
//  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);


TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM3,ENABLE);

TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
  TIM_CCxCmd(TIM3, TIM_Channel_1, TIM_CCx_Enable); //OC1???
TIM_Cmd(TIM3, ENABLE);

  TIM_CtrlPWMOutputs(TIM3,ENABLE);
TIM3->CCER|=1;

}

只看该作者 · 2017-11-16 16:23

主函数初始化， TIM4_PWM_Init(2000-1,84-1); //500HZ
TIM_SetCompare1(TIM3,1000);

1万 · 2017-11-16 17:09

1 .芯片是否还有别的功能，那些正常没有？先排除硬件方面的问题；

2. PWM输出例程，拿官方参考代码一行行比对向下，基本上配置对了就能出波形；

【配置方面注意时钟的正确开启、管脚复用等】

1万 · 2017-11-16 17:11

这个IO是否设置？

1万 · 2017-11-16 17:11

通用定时器输出PWM网上有很多的例程。

1万 · 2017-11-16 17:12

/配置IO口
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD| RCC_APB2Periph_GPIOE,ENABLE);//IO口使能设置
  GPIO_InitTypeDefGPIO_InitStructure; //定义结构体
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;  //TIM3的CH3连接PB8管脚
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP;//复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB,&GPIO_InitStructure);

  //定时器2
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);//配置时钟
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period=10000; //1s
TIM_TimeBaseStructure.TIM_Prescaler=7199; //720分频
TIM_TimeBaseStructure.TIM_ClockDivision=0;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上计数
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);


TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM1;//PWM1模式1
TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;//比较输出使能
TIM_OCInitStructure.TIM_Pulse = 2500; //设置占空比
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出比较极性高
TIM_OC3Init(TIM4, & TIM_OCInitStructure);//初始化TIM4的CH3通道
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);//使能TIM4在CH3通道CCR3上的预装载寄存器
TIM_ARRPreloadConfig(TIM4,ENABLE);//使能TIM4在CH3通道ARR3上的预装载寄存器
TIM_Cmd(TIM4,ENABLE);//使能定时器4

1万 · 2017-11-16 17:14

使用定时器中断反转信号呢？

1万 · 2017-11-16 17:14

http://blog.csdn.net/summer_o_o/article/details/21445345

1万 · 2017-11-16 17:14

STM32F4的设置应该跟stm32差不多吧。没有用过stmF4

只看该作者 · 2017-11-16 18:39

参照例程写的，IO口设置好了，利用中断翻转有波形，看看还有那些设置不对吗

只看该作者 · 2017-11-18 11:00

STM32F4的设置应该跟stm32差不多吧。

F4是STM32其中的一个系列

1万 · 2017-11-18 11:53

配置错误，可以参考原子哥的例子。

只看该作者 · 2017-11-20 20:59

用定时器中断反转信号，这个好

只看该作者 · 2017-11-20 22:15

//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM3_PWM_Init(u16 arr,u16 psc)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB , ENABLE);  //使能GPIO外设时钟使能



//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7 ; //TIM_CH1
      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);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1 ; //TIM_CH1
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

      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       80K
      TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
      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
TIM3通道一
      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_Pulse = 300; //设置待装入捕获比较寄存器的脉冲值
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
      TIM_OC1Init(TIM3, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM3通道二
  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 150;
  TIM_OC2Init(TIM3, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM3通道三
  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 150;
  TIM_OC3Init(TIM3, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM3通道四
  TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 150;
  TIM_OC4Init(TIM3, &TIM_OCInitStructure);
  TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

  TIM_CtrlPWMOutputs(TIM3,ENABLE);       //MOE 主输出使能
  TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器
      TIM_Cmd(TIM3, ENABLE);  //使能TIM1
}

只看该作者 · 2017-11-20 22:23

这个是四路PWM的输出。

PWM输出

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