STM32F4输出PWM问题

cmj2836140 · 发表于 2016-1-7 20:24:29

我使用实验9的案例能正常输出PWM波的，但是当我想换个引脚输出的时候就不行了。
void TIM14_PWM_Init(u32 arr,u32 psc)
{
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GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);

GPIO_PinAFConfig(GPIOF,GPIO_PinSource9,GPIO_AF_TIM14);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOF,&GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Prescaler=psc;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=arr;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;

TIM_TimeBaseInit(TIM14,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC1Init(TIM14, &TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM14, TIM_OCPreload_Enable);

  TIM_ARRPreloadConfig(TIM14,ENABLE);

TIM_Cmd(TIM14, ENABLE);

}

就改了其中两句，改成了
GPIO_PinAFConfig(GPIOF,GPIO_PinSource10,GPIO_AF_TIM14);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

这样PF10口得不到PWM，一直是高电平