PB11 脉宽捕获异常工作求助大神

崔子鑫 · 发表于 2018-5-18 21:06:29

TIM_ICInitTypeDef  TIM2_ICInitStructure;

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TIM5时钟

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);  //使能GPIOA时钟
GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE);

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_11;  //PA0 清除之前设置
//GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_ResetBits(GPIOB,GPIO_Pin_11);    //PA0 下拉

//初始化定时器5 TIM5
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TIM5输入捕获参数
   TIM2_ICInitStructure.TIM_Channel = TIM_Channel_4; //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);

//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM2_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外设NVIC寄存器

TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC4,ENABLE);//允许更新中断 ,允许CC1IE捕获中断

//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_Update,ENABLE);

   TIM_Cmd(TIM2,ENABLE ); //使能定时器5

}

u8  TIM2CH4_CAPTURE_STA=0; //输入捕获状态
u16 TIM2CH4_CAPTURE_VAL; //输入捕获值

//定时器5中断服务程序
void TIM2_IRQHandler(void)
{

if((TIM2CH4_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)

{
if(TIM2CH4_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM2CH4_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM2CH4_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM2CH4_CAPTURE_VAL=0XFFFF;
}else TIM2CH4_CAPTURE_STA++;
}
}

if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
{ xian++;
if(TIM2CH4_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM2CH4_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM2CH4_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
{
TIM2CH4_CAPTURE_STA=0; //清空
TIM2CH4_CAPTURE_VAL=0;
     TIM_SetCounter(TIM2,0);
TIM2CH4_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_CC1|TIM_IT_Update); //清除中断标志位
TIM_ClearITPendingBit(TIM2,TIM_IT_CC1); //清除中断标志位
}