关于stm32测量频率问题(跪求原子哥)

zhongding818

本人使用测量速度模块时, 那个模块是输出脉冲的, 当我使用stm32来计算每秒中的脉冲数,就得到了频率, 然后通过一个计算公式得到速度. 
但是问题是:
      我开始想的是通过stm32的外部中断来计算脉冲数量 ,但是就不知道用什么方法能得到1s的定时, 因为想测量1s钟的脉冲数
   求请教大家给我个思路吧!!!!

正点原子

回复【楼主位】zhongding818:
---------------------------------
一个定时器溢出时间一般都没有1s,你得多次溢出才能到1s,所以在中断里面做个标志,就OK了.

冰是睡着的水

回复【楼主位】zhongding818:
---------------------------------
可以用两个定时器测速度，我之前用51也是这样算的。。
可以参考我的代码。。

#include <AT89X51.h>
#include   <lcd12864.h>
#include   <intrins.h>
#include   <xiaoche.h>
#include   <ds18b20.h>
#ifndef uchar
#define uchar unsigned char
#endif

#ifndef uint
#define uint  unsigned int
#endif
//Function Definition　函数声明 
uchar code num[]={"0123456789:.-"};
uchar code waves[]={"智能小车行驶速度"};
uchar code znwk[] ={"信息101 第十二组"};
uchar code zzr[]={"Louis "};
uchar code CM[] =  {"M/S"};
uchar code sdu[]={"小车速度"};
uchar wdu[4]={0,0,0,0,};
uchar disbuff[5]={0};
uint v;   //储存电机转速
uchar count;  //储存定时器T0中断次数
bit flag; 
/******************************************************************************/
/*--  一幅图像 KISS- 正向取模，字节正序*/     
/*--  宽度x高度=128x64  --*/ 
/********************************************************************************/
uchar code gdcp[]={/*--  调入了一幅图像：C:\Users\Administrator\Desktop\8月\图标\广东交通职业技术学院校徽1.bmp  --*/
/*--  宽度x高度=128x64  --*/
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};
/******************************************************************************/
/*--  一幅图像电子技术研究协会 正向取模，字节正序*/     
/*--  宽度x高度=128x64  --*/ 
/******************************************************************************/
uchar code dzxh []={ 
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      0x00,0x00,0x00,0x00,0x00,0x7F,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
      0x00,0x00,0x00,0x00,0x00,0x0F,0xFF,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
      0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
      0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0xC0,
      0x01,0x83,0x04,0x04,0x12,0x0C,0x00,0x00,0x00,0x00,0x00,0x06,0x00,0xC0,0x17,0xF0,
      0x01,0x83,0x06,0x6E,0x1F,0xFC,0x00,0x00,0x00,0x00,0x01,0xFF,0x0C,0x5E,0x1F,0xD0,
      0x01,0xC3,0x0F,0xFC,0x0F,0xE8,0x00,0xF8,0x71,0x80,0x00,0x10,0x0F,0xFE,0x12,0xF8,
      0x03,0xFF,0x1F,0xE0,0x03,0xFC,0x00,0xFE,0x73,0x80,0x00,0x10,0x1F,0x6C,0x1F,0xF3,
      0x06,0x3B,0x0F,0x66,0x3E,0xF8,0x00,0xCF,0x3B,0x00,0x00,0x1F,0xC9,0xE8,0x1D,0xDC,
      0x07,0xEB,0x3F,0xFF,0x1E,0xF8,0x00,0xC3,0x3F,0x00,0x07,0xFF,0xC3,0xE0,0x3F,0xFC,
      0x0F,0xCB,0x3E,0x6C,0x0E,0xF8,0x00,0xC3,0x9E,0x00,0x07,0x10,0x03,0x60,0x3D,0xF8,
      0x1E,0x4B,0x1F,0xEC,0x0E,0xF8,0x00,0xC3,0x8E,0x00,0x00,0x10,0x1F,0xFF,0x1C,0x78,
      0x07,0xCB,0x1F,0x6C,0x1E,0xB0,0x00,0xC3,0x1E,0x00,0x00,0x10,0x1F,0xF0,0x1F,0xF4,
      0x06,0xEB,0x0F,0xCC,0x7D,0xBC,0x00,0xC7,0x3F,0x00,0x00,0x10,0x01,0xF0,0x3E,0xF4,
      0x06,0x2B,0x1A,0xCC,0x3F,0xAC,0x00,0xFF,0x33,0x80,0x00,0xF0,0x07,0x3C,0x7B,0x9C,
      0x03,0x6F,0x3E,0xCC,0x1F,0xE0,0x00,0xFE,0x73,0x80,0x00,0x70,0x1E,0x0C,0x00,0x0E,
      0x03,0xE7,0x07,0x8C,0x18,0x60,0x00,0x00,0x00,0x00,0x00,0x30,0x38,0x04,0x00,0x06,
      0x00,0x03,0x01,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
      0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
      0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
      0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
      0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
}; 
/******************************************************************************/
void LCD_Write_number(uchar s)//
{
Write_char(1,num);
Delaynms(1);
} 
/********************************************************/ 
void delayms(uint xms) 
{
  uint i,j;
  for(i=xms;i>0;i--)
     for(j=110;j>0;j--);
}
/******************************************************************************/
void disp_temper()//温度值显示
{ 
    uint temper;
temper=read_temp();//读取温度
temper=temper-15;
wdu[1]=temper%10;
wdu[2]=temper%100/10;
wdu[3]=temper/100;
if(tflag==1)
{
LCD_Write_string(3,4," -");
}
else
{
  LCD_Write_string(3,4,"  ");
} 
LCD_set_xy( 3, 4 );
    LCD_Write_number(wdu[3]);
LCD_Write_number(wdu[2]);
LCD_set_xy( 3, 5 );
LCD_Write_number(12); 
    LCD_Write_number(wdu[1]);
LCD_Write_string(3,6, "℃");
}
   /*****************************************************************************/
/******************************************************************************/
void Lcd_Mark2(void)
{
Clr_Scr();//清屏
LCD_Write_string(2,0,znwk);//
LCD_Write_string(1,0,waves);//
LCD_Write_string(3,0,zzr);
LCD_Write_string(4,0,sdu);
LCD_Write_string(4,6,CM);//
}
 /******************************************************************************
 函数功能：显示速度数值                        
******************************************************************************/
void Display_12864(uint x)
{
    disbuff[0]=x/1000;         //取千位
    disbuff[1]=(x%1000)/100;   //取百位 
    disbuff[2]=(x%100)/10;     //取十位 
    disbuff[3]=x%10;           //取个位 
LCD_set_xy( 4, 4 );
LCD_Write_number(disbuff[1]);
LCD_Write_number(12);  //小数点显示
LCD_set_xy( 4, 5 );
LCD_Write_number(disbuff[2]);
LCD_Write_number(disbuff[3]);  
 } 
/*******************************************************
函数功能：主函数
********************************************************/
 void main(void)
 {
    TMOD=0x51;                //定时器T1工作于计数模式1，定时器T0工作于计时模式1；
TH0=(65536-46083)/256;    //定时器T0的高8位设置初值，每50ms产生一次中断
TL0=(65536-46083)%256;    //定时器T0的低8位设置初值，每50ms产生一次中断
EA=1;                     //开总中断
ET0=1;                    //定时器T0中断允许
TR0=1;                    //启动定时器T0
count=0;                  //将T0中断次数初始化为0
Lcd_init();            //调用LCD初始化函数
Clr_Scr();        //清屏
    Disp_img(gdcp);   //显示广东交通职业技术LOGO
delayms(1800);
Disp_img(dzxh);  //显示电子技术协会LOGO
delayms(1500);
Lcd_init();       //从图形显示状态下返回
    Lcd_Mark2();  //12864字显示
Display_12864(0);         //显示速度单位
while(1)                 //无限循环
{
      disp_temper();  //温度显示
  xiaoche_Go();
          TR1=1;            //定时器T1启动
  TH1=0;            //定时器T1高8位赋初值0
  TL1=0;            //定时器T1低8位赋初值0
  flag=0;           //时间还未满1分钟
  while(flag==0)    //时间未满等待
     ;
 v=(TH1*256+TL1)*36/10; //计算速度，每周产生16个脉冲
 Display_12864(v);        //显示速度
    }
}
/*******************************************************
函数功能：定时器T0的中断服务函数
********************************************************/
void Time0(void ) interrupt 1 using 1 //定时器T0的中断编号为1，使用第1组工作寄存器
  {
    count++;          //T0每中断1次，count加1
if(count==20)     //若累计满20次，即计满1秒钟
{
        flag=1;        //计满1秒钟标志位置1
 count=0;       //清0，重新统计中断次数
}
    TH0=(65536-46083)/256;   //定时器T0高8位重新赋初值
 TL0=(65536-46083)%256;   //定时器T0低8位重新赋初值

  }  

螃蟹爱虫

回复【楼主位】zhongding818:
---------------------------------
是的，如原子哥所说，一般不会有定时器一次性定时1S的，那太长了。但是不管它能定时多短，我们都可以在定时器中断内部加个变量记录定时中断的次数，这样就可以随心所欲的想定时多久就能时多久了，然后计算频率就用定时器的输入捕捉来搞比较好。

fangxiaoyanzhou

回复【楼主位】zhongding818:
---------------------------------
楼主，你是采用定时器中断的方式么？可不可以发给我一份源码。。。我的脉冲计数不正常。。