为什么把mini板例程PWM输出实验里的定时器1改为定时器8就没有PWM输出了呢？？？

C磊 · 发表于 2015-11-21 17:57:02

IO口也配置了
TIM1和TIM8不都是高级定时器吗？？？

张-小小龙 · 发表于 2015-11-21 17:57:03

void TIM8_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8 , ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC , ENABLE);  //????GPIO???è?±??????


   //?è??????????????????????,????TIM1 CH1??PWM?????¨??
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_8; //TIM_CH1 TIM_CH3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //???????ì????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = arr; //?è???????????ü??????×°????????×?????×°???????÷???????? 80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //?è??????×÷??TIMx?±?????????????¤·?????  ??·???
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //?è???±??·???:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM?ò??????????
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //?????¨?±?÷????:TIM?????í???÷??????2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±???????????
TIM_OCInitStructure.TIM_Pulse = 0; //?è????×°??????±????????÷????????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????????:TIM????±?????????

TIM_OC1Init(TIM8, &TIM_OCInitStructure);  //?ù??TIM_OCInitStruct?????¨???????????????èTIMx
TIM_OC3Init(TIM8, &TIM_OCInitStructure);  //?ù??TIM_OCInitStruct?????¨???????????????èTIMx

  TIM_CtrlPWMOutputs(TIM8,ENABLE); //MOE ?÷????????

TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable);  //CH1?¤×°??????
TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable);  //CH3?¤×°??????

TIM_ARRPreloadConfig(TIM8, ENABLE); //????TIMx??ARR?????¤×°???????÷

TIM_Cmd(TIM8, ENABLE);  //????TIM8


}