STM32 Mini板的变量被修改，出现502的值，求大神指教

panda哥 · 发表于 2018-7-20 08:34:34

本帖最后由 panda哥于 2018-7-20 08:37 编辑

这个是我用来做超声波测距的程序
#include "timer.h"
#include "led.h"
#include "delay.h"
//////////////////////////////////////////////////////////////////////////////////
//±¾³ÌÐòÖ»¹©Ñ§Ï°Ê¹ÓÃ£¬Î´¾×÷ÕßÐí¿É£¬²»µÃÓÃÓÚÆäËüÈÎºÎÓÃÍ¾
//Mini STM32¿ª·¢°å
//Í¨ÓÃ¶¨Ê±Æ÷ Çý¶¯´úÂë
//ÕýµãÔ×Ó@ALIENTEK
//¼¼ÊõÂÛÌ³:www.openedv.com
//ÐÞ¸ÄÈÕÆÚ:2010/12/03
//°æ±¾£ºV1.0
//°æÈ¨ËùÓÐ£¬µÁ°æ±Ø¾¿¡£
//Copyright(C) ÕýµãÔ×Ó 2009-2019
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////

//Í¨ÓÃ¶¨Ê±Æ÷ÖÐ¶Ï³õÊ¼»¯
//ÕâÀïÊ±ÖÓÑ¡ÔñÎªAPB1µÄ2±¶£¬¶øAPB1Îª36M
//arr£º×Ô¶¯ÖØ×°Öµ¡£
//psc£ºÊ±ÖÓÔ¤·ÖÆµÊý
//ÕâÀïÊ¹ÓÃµÄÊÇ¶¨Ê±Æ÷3!
u16 msCount = 0;//ms¼ÆÊý
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;//Éú³ÉÓÃÓÚ¶¨Ê±Æ÷ÉèÖÃµÄ½á¹¹Ìå
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //Ê±ÖÓÊ¹ÄÜ
  TIM_DeInit(TIM3);//ÅäÖÃ¶¨Ê±Æ÷»ù´¡½á¹¹Ìå
TIM_TimeBaseStructure.TIM_Period = arr; //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂÊÂ¼þ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔØ¼Ä´æÆ÷ÖÜÆÚµÄÖµ  ¼ÆÊýµ½4000Îª1ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //ÉèÖÃÓÃÀ´×÷ÎªTIMxÊ±ÖÓÆµÂÊ³ýÊýµÄÔ¤·ÖÆµÖµ  4MhzµÄ¼ÆÊýÆµÂÊ
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //ÉèÖÃÊ±ÖÓ·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòÉÏ¼ÆÊýÄ£Ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾ÝTIM_TimeBaseInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯TIMxµÄÊ±¼ä»ùÊýµ¥Î»

TIM_ClearFlag(TIM3, TIM_FLAG_Update); //Çå³ý¸üÐÂÖÐ¶Ï£¬±ÜÃâÒ»´ò¿ªÖÐ¶ÏÁ¢¼´²úÉúÖÐ¶Ï
TIM_ITConfig(  //Ê¹ÄÜ»òÕßÊ§ÄÜÖ¸¶¨µÄTIMÖÐ¶Ï
   TIM3, //TIM3
   TIM_IT_Update ,
   ENABLE  //Ê¹ÄÜ
   );
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3ÖÐ¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏÈÕ¼ÓÅÏÈ¼¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //´ÓÓÅÏÈ¼¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQÍ¨µÀ±»Ê¹ÄÜ
NVIC_Init(&NVIC_InitStructure);  //¸ù¾ÝNVIC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯ÍâÉèNVIC¼Ä´æÆ÷
TIM_Cmd(TIM3, DISABLE);  //Ê¹ÄÜTIMxÍâÉè

}
void TIM3_IRQHandler(void) //TIM3ÖÐ¶Ï
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //¼ì²éÖ¸¶¨µÄTIMÖÐ¶Ï·¢ÉúÓë·ñ:TIM ÖÐ¶ÏÔ´
  {
  TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //Çå³ýTIMxµÄÖÐ¶Ï´ý´¦ÀíÎ»:TIM ÖÐ¶ÏÔ´
msCount++;
  }
}

u32 measure(void)
{
  u32 t=0,b=0;
TIM_SetCounter(TIM3,0);//Çå³ý¼ÆÊý
msCount = 0;
TIM_Cmd(TIM3, ENABLE);  //Ê¹ÄÜTIMxÍâÉè
LED0=1; //·¢Éä40KHz·½²¨
delay_us(200);
LED0=0;
delay_us(300);    //µÈ´ýÓàÕðÏûÊ§
while(INPUT==0);
TIM_Cmd(TIM3, DISABLE);  //Ê¹ÄÜTIMxÍâÉè
t = msCount*100000;//MS»»Ëã
b = TIM_GetCounter(TIM3)/4*100;//Î¢Ãë¼¶³ËÒÔ100±¶
t = t+b+(TIM_GetCounter(TIM3)%4*25);//µÃµ½US
TIM_SetCounter(TIM3,0);//Çå³ý¼ÆÊý
delay_ms(10);
return t;
}

#ifndef __TIMER_H
#define __TIMER_H
#include "sys.h"
//////////////////////////////////////////////////////////////////////////////////
//±¾³ÌÐòÖ»¹©Ñ§Ï°Ê¹ÓÃ£¬Î´¾×÷ÕßÐí¿É£¬²»µÃÓÃÓÚÆäËüÈÎºÎÓÃÍ¾
//ALIENTEK Mini STM32¿ª·¢°å
//Í¨ÓÃ¶¨Ê±Æ÷ Çý¶¯´úÂë
//ÕýµãÔ×Ó@ALIENTEK
//¼¼ÊõÂÛÌ³:www.openedv.com
//ÐÞ¸ÄÈÕÆÚ:2010/12/03
//°æ±¾£ºV1.0
//°æÈ¨ËùÓÐ£¬µÁ°æ±Ø¾¿¡£
//Copyright(C) ÕýµãÔ×Ó 2009-2019
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////
void TIM3_Int_Init(u16 arr,u16 psc);
u32  measure(void);
#endif

#include "LED.h"
#include "delay.h"
#include "sys.h"
#include "timer.h"
#include "lcd.h"
#include "usart.h"
//ALIENTEK Mini STM32¿ª·¢°å·¶Àý´úÂë7
//¶¨Ê±Æ÷ÖÐ¶ÏÊµÑé
//¼¼ÊõÖ§³Ö£ºwww.openedv.com
//¹ãÖÝÊÐÐÇÒíµç×Ó¿Æ¼¼ÓÐÏÞ¹«Ë¾
int main(void)
{
u32 max,sum=0,V=0;
u32 i,Time1,V1;
u32  a[10]={0,0,0,0,0,0,0,0,0,0};
u8 k,j;
  int Time=0; //¶¨Òå·µ»ØÊ±¼äÎª¸¡µãÐÍ
  delay_init();    //ÑÓÊ±º¯Êý³õÊ¼»¯
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// ÉèÖÃÖÐ¶ÏÓÅÏÈ¼¶·Ö×é2
  uart_init(9600); //´®¿Ú³õÊ¼»¯Îª9600
  LED_Init();    //³õÊ¼»¯ÓëLEDÁ¬½ÓµÄÓ²¼þ½Ó¿Ú
  LCD_Init();    //³õÊ¼»¯ÓëLCDÁ¬½ÓµÄÓ²¼þ½Ó¿Ú
  LCD_Clear(WHITE); //°×É«±³¹â
  TIM3_Int_Init(3999,18-1);//4MHz  4000Îª1ms
  POINT_COLOR=RED;  //×ÖÌåÑÕÉ«ÉèÖÃÎªºìÉ«
  LCD_ShowString(30,70,200,24,24, "Time:    . us");
  LCD_ShowString(30,100,200,24,24,"V=    . m/s");
  LCD_ShowString(100,130,200,16,16,"2018/7/19");
  while(1)
  {
for(i=0;i<10;i++)
{
   a=measure();
}
// Ã°ÅÝÅÅÐò
   for(k=0;k<10;k++)
{
   for(j=k+1;j<10;j++)
   {
   if(a[k]>a[j])
   {
      max=a[k];
      a[k]=a[j];
      a[j]=max;
   }
   }
   }
//  È¡Æ½¾ùÖµ
   sum=0;
   for(k=2;k<8;k++)
   {
   sum+=a[k];
   }
   Time=sum/6;
V=1490000/Time;
   Time=0;
V1=V/100;
      LCD_ShowxNum(90,100,V1,4,24,0);
      V=V-V1;
      LCD_ShowxNum(150,100,V,1,24,0);
      Time1=Time/100;
      LCD_ShowxNum(100,70,Time1,4,24,0);
      Time=Time-Time1;
      LCD_ShowxNum(160,70,Time,2,24,0);
   delay_ms(10);
}
}

void LED_Init(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //Ê¹Ä&UumlA¶Ë¿ÚÊ±ÖÓ
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;    //LED0-->A.8 ¶Ë¿ÚÅäÖÃ
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //ÍÆÍìÊä³ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO¿ÚËÙ¶ÈÎª50MHz
GPIO_Init(GPIOA, &GPIO_InitStructure);    //¸ù¾ÝÉè¶¨²ÎÊý³õÊ¼»¯GPIOA.8
GPIO_ResetBits(GPIOA,GPIO_Pin_8);    //PA.8 Êä³öµÍ

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO¿ÚËÙ¶ÈÎª50MHz
GPIO_Init(GPIOA, &GPIO_InitStructure);  //¸¡¿ÕÊäÈë£¬IO¿ÚËÙ¶ÈÎª50hz
}

正点原子 · 发表于 2018-7-20 08:34:35

乱七八糟

panda哥 · 发表于 2018-7-20 08:35:34

这是我拿定时器的例程直接改的，但是Time的值无缘无故被修改

panda哥 · 发表于 2018-7-20 08:52:30

  while(1)
  {   
    for(i=0;i<10;i++)
    {
     a=measure();
    }
// Ã°ÅÝÅÅÐò
     for(k=0;k<10;k++)
    {
     for(j=k+1;j<10;j++)
     {
       if(a[k]>a[j])
       {
        max=a[k];
        a[k]=a[j];
        a[j]=max;
       }
     }     
     }
//  È¡Æ½¾ùÖµ
     sum=0;
     for(k=2;k<8;k++)
     {
     sum+=a[k];
     }
       Time=sum/6;
    V=1490000/Time;
     Time=0;
    V1=V/100;
        LCD_ShowxNum(90,100,V1,4,24,0);
        V=V-V1;
        LCD_ShowxNum(150,100,V,1,24,0);     
        Time1=Time/100;
        LCD_ShowxNum(100,70,Time1,4,24,0);
        Time=Time-Time1;
        LCD_ShowxNum(160,70,Time,2,24,0);
      delay_ms(10);
   }  
}

这个是while里执行的程序‘