想使用stm32定时4同时输出两路pwm波为什么不行求解

1157965718 · 发表于 2016-3-26 01:03:41

GPIO_InitTypeDef GPIO_InitStructure;
   TIM_TimeBaseInitTypeDef TIM_TimBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO,ENABLE);

   GPIO_PinRemapConfig(GPIO_Remap_TIM4,ENABLE);

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14 |GPIO_Pin_15; //
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOD,&GPIO_InitStructure);

   TIM_TimBaseStructure.TIM_Period=arr;
   TIM_TimBaseStructure.TIM_Prescaler=psc;
   TIM_TimBaseStructure.TIM_ClockDivision=0;
   TIM_TimBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;

   TIM_TimeBaseInit(TIM4,&TIM_TimBaseStructure);

   TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCPolarity_High;

TIM_OC1Init(TIM4,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4,TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OC2Init(TIM4,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM4,TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM4, ENABLE);
TIM_Cmd(TIM4,ENABLE);