RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_InternalClockConfig(TIM3);
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Period = 65536 - 1; //ARR
TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1; //PSC
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);
TIM_ICInitTypeDef TIM_ICInitStructure;//定义输入捕获结构体
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;//通道1
TIM_ICInitStructure.TIM_ICFilter = 0xF;//滤波器开最大
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;//上升沿触发
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;//不分频
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;//直接模式
TIM_ICInit(TIM3, &TIM_ICInitStructure);
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1);//选择触发源
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);//从模式
TIM_Cmd(TIM3, ENABLE);//开启定时器
}
uint32_t IC_GetFreq(void)
{
return 1000000 / (TIM_GetCapture1(TIM3) + 1);
}
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