请教一下大家，关于TIM3和TIM8输出PWM的问题

支持者2400 · 发表于 2025-3-17 15:47:14

请教一下大家，关于TIM3和TIM8输出PWM的问题，想用TIM1-4和TIM8输出PWM，TIM1、2、4都成功了，TIM3和TIM8一直输出不正确，TIM3的引脚PB0、PB1、PB4、PB5输出PWM，TIM8的PC6、PC7、PC8、PC9输出PWM一直不成功，大家帮忙看一下，谢谢了。

void TIM3_PWM_Init(u16 arr, u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //?????3??
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE); //??GPIO??
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1|GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//???TIM3
TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);
//???TIM3_CH1 PWM ??
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
//???TIM3_CH2 PWM ??
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
//???TIM3_CH3 PWM ??
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
//???TIM3_CH4 PWM ??
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
//??TIM3?CCR????????
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
//??TIM3
TIM_Cmd(TIM3, ENABLE);
//TIM_CtrlPWMOutputs(TIM3, ENABLE);
}
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); //?????3??
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); //??GPIO???AFIO????????
//????????????,??TIM8 CH2?PWM???? GPIOB.5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //??????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);//???GPIO
//???TIM8
TIM_TimeBaseStructure.TIM_Period = arr; //???????????????????????????
TIM_TimeBaseStructure.TIM_Prescaler =psc; //??????TIMx???????????
TIM_TimeBaseStructure.TIM_ClockDivision =TIM_CKD_DIV1; //??????:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM??????
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure); //??TIM_TimeBaseInitStruct?????????TIMx???????
//???TIM8 Channel2 PWM??
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //???????:TIM????????2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
// TIM_OCInitStructure.TIM_Pulse=CCR1_Val;
TIM_OC1Init(TIM8, &TIM_OCInitStructure); //??T??????????TIM8 OC2
TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable); //??TIM8?CCR2????????
TIM_CtrlPWMOutputs(TIM8,ENABLE);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
// TIM_OCInitStructure.TIM_Pulse=CCR2_Val;
TIM_OC2Init(TIM8, &TIM_OCInitStructure); //??T??????????TIM8 OC2
TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable); //??TIM8?CCR2????????
TIM_CtrlPWMOutputs(TIM8,ENABLE);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
//TIM_OCInitStructure.TIM_Pulse=CCR3_Val;
TIM_OC3Init(TIM8, &TIM_OCInitStructure); //??T??????????TIM8 OC2
TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable); //??TIM8?CCR2????????
TIM_CtrlPWMOutputs(TIM8,ENABLE);
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //??????
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //????:TIM???????
//TIM_OCInitStructure.TIM_Pulse=CCR4_Val;
TIM_OC4Init(TIM8, &TIM_OCInitStructure); //??T??????????TIM8 OC2
TIM_OC4PreloadConfig(TIM8, TIM_OCPreload_Enable); //??TIM8?CCR2????????
TIM_CtrlPWMOutputs(TIM8,ENABLE);
TIM_Cmd(TIM8, ENABLE); //??TIM8
}