求助,STM32F405PWM输出不到100K就成三角波了

2019-07-14 18:17发布

tiM3输出PWM 管脚直接连示波器 还不到100K就成三角波了 有大神做过1M的PWM方波测试吗
友情提示: 此问题已得到解决,问题已经关闭,关闭后问题禁止继续编辑,回答。
8条回答
pailisi
2019-07-14 23:06
已经开启100M了,下面是gpio和tim的设置代码,请指教
GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  
GPIO_Init(GPIOA, &GPIO_InitStructure);
 
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_TIM3); 
 
TIM_TimeBaseStructure.TIM_Period = 60000;
TIM_TimeBaseStructure.TIM_Prescaler = 0;//PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;//0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
 
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
 
TIM_Cmd(TIM3, ENABLE); 

一周热门 更多>