Timer1做4路PWM是否必须同时启停？

只看该作者 · 2016-3-6 15:51

准备用Timer1做4路PWM，输出4路方波，是否必须同时启动或停止这4路方波，能不能随意启停任意一路？

1万 · 2016-3-6 23:53

//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
}
这样我盟就可以输出四路pwm了