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发表于 2023-7-27 15:02:58
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void TIM2_Cap_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能TIM2时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1; //PA0 清除之前设置 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //PA0 上拉输入 GPIO_Init(GPIOA, &GPIO_InitStructure); // GPIO_ResetBits(GPIOA,GPIO_Pin_0|GPIO_Pin_1); //PA0 //初始化定时器2 TIM2 TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值 TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频器 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位 //初始化TIM2输入捕获参数 TIM2_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上 TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //下降沿捕获 TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上 TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频 TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波 TIM_ICInit(TIM2, &TIM2_ICInitStructure); TIM_ITConfig(TIM2,TIM_IT_CC1,ENABLE); //初始化TIM2输入捕获参数 TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC1S=01 选择输入端 IC1映射到TI1上 TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //下降沿捕获 TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上 TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频 TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波 TIM_ICInit(TIM2, &TIM2_ICInitStructure); // TIM_ITConfig(TIM2,TIM_IT_CC2,ENABLE); //中断分组初始化 NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //先占优先级1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外设NVIC寄存器 // TIM_ITConfig(TIM2,TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断 // TIM_ITConfig(TIM2,TIM_IT_CC2,ENABLE);//允许更新中断 ,允许CC1IE捕获中断 TIM_Cmd(TIM2,ENABLE ); //使能定时器2 } |
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