求指教输入捕获

jiushibuzhidao

求指教，这个程序为什么捕获后输出的值永远都是零啊，而且能捕获到得频率特别低

#include "stm32f10x.h"

u8  TIM5CH1_CAPTURE_STA=0; //输入捕获状态    

u16 TIM5CH1_CAPTURE_VAL; //输入捕获值

void USART1_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);    

USART_InitStructure.USART_BaudRate = 9600;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_1;

USART_InitStructure.USART_Parity = USART_Parity_No ;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_InitStructure.USART_Mode = USART_Mode_Tx;

USART_Init(USART1, &USART_InitStructure);

USART_Cmd(USART1, ENABLE);

USART_ClearFlag(USART1,USART_FLAG_TC);//清除USARTx的待处理标志位

}

//void NVIC_Configuration(void)

//{

// NVIC_InitTypeDef NVIC_InitStructure; 

// /* Configure the NVIC Preemption Priority Bits */  

// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

//

// /* Enable the USARTy Interrupt */

// NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;  

// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;

// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;

// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

// NVIC_Init(&NVIC_InitStructure);

//}

void TIM5_Cap_Init(u16 arr,u16 psc)

{  

GPIO_InitTypeDef GPIO_InitStructure;

TIM_ICInitTypeDef  TIM5_ICInitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

    NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //使能TIM5时钟

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);  //使能GPIOA时钟

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_6;  //PA0 清除之前设置  

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  

GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_ResetBits(GPIOB,GPIO_Pin_6); //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(TIM5, &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

TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上

  TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获

  TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上

  TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频 

  TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波

  TIM_ICInit(TIM5, &TIM5_ICInitStructure);

//中断分组初始化

NVIC_InitStructure.NVIC_IRQChannel = TIM5_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(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断

    TIM_Cmd(TIM5,ENABLE ); //使能定时器5

   

}

int main()

{

u32 temp=0;

SystemInit();

USART1_Config();

TIM5_Cap_Init(0XFFFF,72-1); //以1Mhz的频率计数 

while(1)

{

 

  if(TIM5CH1_CAPTURE_STA&0X80)//成功捕获到了一次上升沿

{

temp=TIM5CH1_CAPTURE_STA&0X3F;

temp*=65536;//溢出时间总和

temp+=TIM5CH1_CAPTURE_VAL;//得到总的高电平时间

USART_SendData(USART1,temp);

while( USART_GetFlagStatus(USART1,USART_FLAG_TC)!= SET);//set为1  TC为1发送完成

USART_ClearFlag(USART1, temp);

TIM5CH1_CAPTURE_STA=0;//开启下一次捕获

}

}

}

void TIM5_IRQHandler(void)

{ 

if((TIM5CH1_CAPTURE_STA&0X80)==0)//还未成功捕获

{  

if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)  

{    

if(TIM5CH1_CAPTURE_STA&0X40)//已经捕获到高电平了

{

if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了

{

TIM5CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次

TIM5CH1_CAPTURE_VAL=0XFFFF;

}else TIM5CH1_CAPTURE_STA++;

}  

}

if (TIM_GetITStatus(TIM5, TIM_IT_CC1) == SET)//捕获1发生捕获事件

{

if(TIM5CH1_CAPTURE_STA&0X40) //捕获到一个下降沿

{  

TIM5CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿

TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);//获取输入捕获1的值

  TIM_OC1PolarityConfig(TIM5,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

{

TIM5CH1_CAPTURE_STA=0; //清空

TIM5CH1_CAPTURE_VAL=0;

TIM_SetCounter(TIM5,0); //设置计数器的值

TIM5CH1_CAPTURE_STA|=0X40; //标记捕获到了下升沿

  TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获

}    

}           

 } 

    TIM_ClearITPendingBit(TIM5, TIM_IT_CC1); //清除中断标志位 

}

jiushibuzhidao

顶一下

正点原子

看你的代码,貌似是参考的我们的例程.
何不仿真试试?

到底看看哪个环节出错了.

jiushibuzhidao

恩恩！我试试！
代码本身有什么错误没得啊？

jiushibuzhidao

回复【3楼】正点原子:
看你的代码,貌似是参考的我们的例程.
何不仿真试试?
到底看看哪个环节出错了.
---------------------------------
原子哥啊！我仿真了一下，貌似是主函数的if没有进去，但是串口还是有发出数据，只不过全部是零，我不提供脉冲就不发送！而且还可以根据调脉冲的频率来改变串口发数据的快慢！都看了两天了，帮我分析分析呗！我用函数发生器输出的脉冲

正点原子

回复【5楼】jiushibuzhidao:
---------------------------------
说明进入了的主循环的if啊,否则怎么能发送数据出来?
我看你就main函数有数据发送的操作.