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
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原理图上面有的,还有就是芯片数据手册上也有,可以搜索下
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