STM32 TIM1配置为PWM2模式输出并赋值重复计数器TIM1->RCR，无法产生准确的脉冲，在计数器第一次溢出时就进入中断 [mw_shl_code=c,true]void TIM1_PWM_Init(void) { RCC->APB2ENR|=1<<11; //TIM1 时钟使能 RCC->APB2ENR|=1<<6; //使能 PORTE 时钟 GPIOE->CRH&=0XFF0FFFFF; //PE13输出 GPIOE->CRH|=0X00B00000; //PE13复用功能输出 RCC->APB2ENR|=1<<0; //开启辅助时钟 AFIO->MAPR&=0XFFFFFF3F; //清除 MAPR 的[12] AFIO->MAPR|=3<<6; //部分重映像,TIM1_CH3->E13 TIM1->ARR=49; //设定计数器自动重装值 TIM1->SC=71; //预分频器分频设置 TIM1->RCR=10; TIM1->CCMR2|=7<<4; //CH3 PWM2 模式 TIM1->CCMR2|=1<<3; //CH3 预装载使能 TIM1->CCER|=1<<9; //OC3 低电平有效 TIM1->CCER|=1<<8; //OC3 输出使能 TIM1->CCR3=10; TIM1->BDTR|=1<<15; TIM1->CR1=0x0080; //ARPE 使能 TIM1->CR1|=0x01; //使能定时器 1 TIM1->DIER|=1<<0; //允许更新中断 MY_NVIC_Init(1,3,TIM1_UP_IRQn,2);//抢占 1，子优先级 3，组 2 } void TIM1_UP_IRQHandler(void) { if(TIM1->SR&0X0001) //更新中断 { TIM1->CR1&=~(1<<0); TIM1->SR=0; } } [/mw_shl_code]