先上代码
[mw_shl_code=c,true]void TIM1_PWM_init(u16 arr,u16 psc) { RCC->AHB1ENR|=1<<0; //??PA?±?? GPIO_set(GPIOA,PIN8,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_100M,GPIO_PUPD_NONE);//PA8?????????????ì??????100M?????????? GPIO_AF_set(GPIOA,8,1);//°?PA8???????¨?±?÷1 RCC->APB2ENR|=1<<0; //??TIM1?±?? TIM1->ARR=arr; TIM1->SC=psc; TIM1->CCMR1&=~(0X07<<4); TIM1->CCMR1|=0X06<<4;//PWM????1 TIM1->CCMR1|=1<<3;//?¤×°?????? TIM1->CR1|=1<<7;//×???×°?????? TIM1->CR1|=1<<4;//?ò?????????? TIM1->CCER&=~(1<<1);//?????????§ TIM1->CCER|=1<<0;//PWM???????? TIM1->BDTR|=1<<15;//????OC OCN TIM1->CCR1=100; TIM1->EGR|=1<<0;//???????ù???????÷ TIM1->CR1|=1<<0;//??TIM1?¨?±?÷ }[/mw_shl_code] 这是输出波形

放大后频率，占空比都很正常，但是把时基调成2.5ms就会看到上面的波形，这是什么原因呢？而且那个空隙很有规律会随着PSC的变化而变化，这是什么原因呢？