[mw_shl_code=c,true]void TIM4_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM4_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOD,&GPIO_InitStructure);
GPIO_ResetBits(GPIOD,GPIO_Pin_14);
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM4_ICInitStructure.TIM_Channel = TIM_Channel_3;
TIM4_ICInitStructure.TIM_Channel = GPIO_ReadInputDataBit(GPIOD,GPIO_Pin_14)?TIM_ICPolarity_Falling:TIM_ICPolarity_Rising;
TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM4_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波
TIM_ICInit(TIM4, &TIM4_ICInitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //从优先级0级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化
TIM_ITConfig(TIM4,TIM_IT_Update|TIM_IT_CC3,ENABLE);
TIM_Cmd(TIM4,ENABLE);
}[/mw_shl_code]
最后main里面的是
[mw_shl_code=c,true]TIM4_Cap_Init(0xffff,71)[/mw_shl_code]
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发表于 2015-9-23 15:20:13
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