求助这定时器的两个通道怎么不能一起开

龙行 · 发表于 2015-8-14 13:21:54

[mw_shl_code=c,true]//---------------------TIM2CH2 记录上升沿的数目------------- TIM_ICInitTypeDef TIM2_ICInitStructure; void TIM2_CH2_Init(u32 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); //TIM5时钟使能 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能PORTA时钟 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_1; //GPIOA1 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; //下拉 GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA1 GPIO_PinAFConfig(GPIOA,GPIO_PinSource1|GPIO_PinSource2,GPIO_AF_TIM2); //PA1复用位定时器2 TIM_TimeBaseStructure.TIM_Prescaler=psc; //定时器分频 TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式 TIM_TimeBaseStructure.TIM_Period=arr; //自动重装载值 TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); //初始化TIM5输入捕获参数 TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2|TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上 TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获 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|TIM_IT_CC1,ENABLE); //允许更新中断 ,允许CC1IE捕获中断 TIM_Cmd(TIM2,ENABLE ); //使能定时器5 NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2; //抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority =0; //子优先级3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器、 } //中断服务函数 void TIM2_IRQHandler(void) { if(TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET) //捕获1发生捕获事件发生捕获中断 { a+=1; } if(TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET) //捕获1发生捕获事件发生捕获中断 { b+=1; } TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_CC1); //清除中断标志位 }[/mw_shl_code]