如何配置寄存器版pwm输出，STM32F407

百年孤独1998 · 发表于 2018-6-15 17:24:49

给摄像头程序寄存器版本，用TIM9输出两路pwm波//psc￡oê±ÖóÔ¤·ÖÆμêy
void TIM9_CH2_PWM_Init(u16 arr,u16 psc)
{
RCC->APB2ENR|=1<<16;    //TIM9 ê±Öóê1Äü
RCC->AHB1ENR|=1<<0;    //ê1ÄüPORTAê±Öó
RCC->AHB1ENR|=1<<4;    //ê1ÄüPORTEê±Öó
GPIO_Set(GPIOA,PIN3,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_100M,GPIO_PUPD_PU);//PA3,¸′óÃ1|Äü,éÏà-
GPIO_AF_Set(GPIOA,3,3); //PA3,AF3
GPIO_Set(GPIOE,PIN6,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_100M,GPIO_PUPD_PU);//PA3,¸′óÃ1|Äü,éÏà-
GPIO_AF_Set(GPIOE,6,3); //PA3,AF3
TIM9->ARR=arr;    //éè¶¨¼ÆêyÆ÷×Ô¶ˉÖØ×°Öμ
TIM9->PSC=psc;    //Ô¤·ÖÆμÆ÷
TIM9->CCMR1|=6<<12;    //CH2 PWM1Ä￡ê½
TIM9->CCMR1|=1<<11; //CH2 Ô¤×°ÔØê1Äü
TIM9->CCER|=1<<4;    //OC2 êä3öê1Äü
  TIM9->CCER|=1<<1;          //OC1μíμçÆ½óDD§
TIM9->CR1|=1<<7;    //ARPEê1Äü
TIM9->CR1|=1<<0; //ê1Äü¶¨ê±Æ÷9
}

//TIM9 CH1 PWMêä3öéèÖÃ
//PWMêä3ö3õê¼»ˉ
//arr￡o×Ô¶ˉÖØ×°Öμ
//psc￡oê±ÖóÔ¤·ÖÆμêy
void TIM9_CH1_PWM_Init(u16 arr,u16 psc)////////////
{
      RCC->APB2ENR|=1<<16;          //TIM9 ê±Öóê1Äü
      RCC->AHB1ENR|=1<<0;          //ê1ÄüPORTAê±Öó
      GPIO_Set(GPIOA,PIN2,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_100M,GPIO_PUPD_PU);//PA2,¸′óÃ1|Äü,éÏà-
      GPIO_AF_Set(GPIOA,2,3);       //PA2,AF3
      GPIO_Set(GPIOE,PIN5,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_100M,GPIO_PUPD_PU);//PA2,¸′óÃ1|Äü,éÏà-
      GPIO_AF_Set(GPIOE,5,3);       //PA2,AF3

      TIM9->ARR=arr;                //éè¶¨¼ÆêyÆ÷×Ô¶ˉÖØ×°Öμ
      TIM9->PSC=psc;                //Ô¤·ÖÆμÆ÷
      TIM9->CCMR1|=6<<4;       //CH1 PWM1Ä￡ê½
      TIM9->CCMR1|=1<<3;       //CH2 Ô¤×°ÔØê1Äü
      TIM9->CCER|=1<<0;          //OC1 êä3öê1Äü
      TIM9->CCER|=1<<1;          //OC1μíμçÆ½óDD§
      TIM9->CR1|=1<<7;                //ARPEê1Äü
      TIM9->CR1|=1<<0;          //ê1Äü¶¨ê±Æ÷9
}

为什么输出的是锯齿波？@正点原子
寄存器版本的定时器时钟如何配置？