STM32F4x输出pwm配置完后没有输出！

ousam 提问时间：2023-7-14 11:34 / 未解决

问答
是否解决:	未解决

如题，我先配置GPIOPD12后配置TIM4_CH1,但是通过监测发现没有PWM 输出，不知道是不是哪儿出问题了，定时器CNT仿真看到是正常的，但是就是没有PWM输出到gpio上，看GPIO的寄存器ISTAT也没有变化，看看哪位大神指导一下，或者我是那个寄存器没配置对？：程序如下：

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);

GPIO_StructInit(&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin =GPIO_Pin_12; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; GPIO_Init(DI8_GPIO_PORT, &GPIO_InitStructure); GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // NVIC_InitTypeDef NVIC_InitStructure; //NVIC RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

TIM_TimeBaseStructure.TIM_Period = 21000-1; //250us TIM_TimeBaseStructure.TIM_Prescaler =0; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down; TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable); TIM_SelectOutputTrigger(TIM4, TIM_TRGOSource_OC1Ref); TIM_ARRPreloadConfig(TIM4, ENABLE);

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //TIM_OCNPolarity_High; TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;//TIM_OCNPolarity_High; TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;// TIM_OCIdleState_Reset TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;// TIM_OCNIdleState_Reset TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; TIM_OCInitStructure.TIM_Pulse = 10500+30; TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Disable);