关于定时器的输入捕获问题

hunkxie · 发表于 2014-6-14 23:40:07

[mw_shl_code=c,true]TIM_ICInitTypeDef TIM2_ICInitStructure; //这里时钟选择为APB1的2倍，而APB1为36M //arr：自动重装值。 //psc：时钟预分频数 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_GPIOB, ENABLE); //使能GPIOB时钟 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB10 清除之前设置 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PB10 输入 GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_ResetBits(GPIOB,GPIO_Pin_10); //PB10 下拉 //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_3; //CC1S=01 选择输入端 IC3映射到TI3上 TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获 TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI3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); //中断分组初始化 NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2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外设NVIC寄存器 TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC3,ENABLE);//允许更新中断 ,允许CC3IE捕获中断 //TIM_ITConfig(TIM2,TIM_IT_CC3,ENABLE);//允许更新中断 ,允许CC3IE捕获中断 TIM_Cmd(TIM2,ENABLE); //使能定时器2 } u16 TIM2CH3_CAPTURE_STA=0; //输入捕获状态 u16 TIM2CH3_CAPTURE_VAL; //输入捕获值 //定时器2中断服务程序 void TIM2_IRQHandler(void) { if((TIM2CH3_CAPTURE_STA&0X80)==0)//还未成功捕获 { if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) { if(TIM2CH3_CAPTURE_STA&0X40)//已经捕获到高电平了 { if((TIM2CH3_CAPTURE_STA&0X3F)==0X3F)//高电平太长了 { TIM2CH3_CAPTURE_STA|=0X80;//标记成功捕获了一次 TIM2CH3_CAPTURE_VAL=0XFFFF; } else TIM2CH3_CAPTURE_STA++; } } if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)//捕获1发生捕获事件 { if(TIM2CH3_CAPTURE_STA&0X40) //捕获到一个下降沿 { TIM2CH3_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿 TIM2CH3_CAPTURE_VAL=TIM_GetCapture1(TIM2); TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获 }else //还未开始,第一次捕获上升沿 { TIM2CH3_CAPTURE_STA=0; //清空 TIM2CH3_CAPTURE_VAL=0; TIM_SetCounter(TIM2,0); TIM2CH3_CAPTURE_STA|=0X40; //标记捕获到了上升沿 TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获 } } } TIM_ClearITPendingBit(TIM2, TIM_IT_CC3|TIM_IT_Update); //清除中断标志位 } [/mw_shl_code]

这段代码就是在战舰的代码基础上改的改成TIM2的3通道可结果每次进入中断只是计数器更新中断，而不是上升沿产生的中断，请各位大神帮忙看看哪儿有问题，中断信号源是另外一个IO口产生的一个方波。再用跳线连接