我的代码中设计延时与实际不符的问题

aswsd · 发表于 2018-5-7 21:27:22

这是我根据原子哥ds18b20代码改写的一个代码
实现功能是根据设定的时间周期（红色部分），把测得温度与RTC中时间用IIC方式保存到板上EEPROM
按下KEY0显示EEPROM中保存的5组数据（温度及时间）

但实际运行时，我发现设计的时间周期与我设定的不一样
设定10s时，实际上会是15，16s
设定5s时，实际上会是8s
设定3s时，实际上会是5s
设定2s时，实际上会是3s
感觉一直是1.5倍的样子，这是为什么呢？
补充下，我是等一段较长时间过后看5组数据的时间间隔的，平时不按KEY0

正点原子 · 发表于 2018-5-7 21:27:23

没看到红色部分。这种问题，仿真很好解决的

aswsd · 发表于 2018-5-7 21:31:16

本帖最后由 aswsd 于 2018-5-8 15:26 编辑

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "lcd.h"
#include "ds18b20.h"
#include "key.h"
#include "24cxx.h"
#include "myiic.h"
#include "rtc.h"

u8 save =0;
u8 x=0;
int main(void)
{
      u8 t=0;
      u16 t1=0;
      u8 key,pm;
      u8 hour,min,sec;
      short temperature,tempsave;
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      delay_init();
      uart_init(9600);
      LED_Init();
      LCD_Init();
      TIM1_PWM_Init(899,0);
      AT24CXX_Init();
      KEY_Init();

      POINT_COLOR=RED;
      LCD_ShowString(60,50,200,16,16,"Mini STM32");
      LCD_ShowString(60,70,200,16,16,"DS18B20 TEST");
      LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK");
      LCD_ShowString(60,110,200,16,16,"2014/3/12");
      while(DS18B20_Init())
      {
            LCD_ShowString(60,130,200,16,16,"DS18B20 Error");
            delay_ms(200);
            LCD_Fill(60,130,239,130+16,WHITE);
               delay_ms(200);
      }
      LCD_ShowString(60,130,200,16,16,"DS18B20 Ready!");
      while(AT24CXX_Check())
      {
            LCD_ShowString(60,150,200,16,16,"24C02 Check Failed!");
            delay_ms(500);
            LCD_ShowString(60,150,200,16,16,"Please Check!    ");
            delay_ms(500);
      }
      LCD_ShowString(60,150,200,16,16,"24C02 Ready!");
      while(RTC_Init())
      {
            LCD_ShowString(60,170,200,16,16,"RTC ERROR! ");
            delay_ms(800);
            LCD_ShowString(60,170,200,16,16,"RTC Trying...");
      }
      LCD_ShowString(60,170,200,16,16,"RTC Ready!");
      POINT_COLOR=BLUE;
      while(1)
      {
            key=KEY_Scan(0);
            if(key==KEY0_PRES)
            {
            LCD_Fill(60,190,239,190+16,WHITE);
               for(key=0;key<5;key++)
                     {
                     LCD_ShowString(60,190+20*key,90,16,16,"Temp: . C");
                     LCD_ShowString(170,190+20*key,200,16,16,"  :  :  ");
                     temperature=AT24CXX_ReadOneByte(6*key+1);
                     temperature<<=8;
                     temperature+=AT24CXX_ReadOneByte(6*key);
                     temperature=(float)temperature*0.625;
                     pm=AT24CXX_ReadOneByte(6*key+2);
                     hour=AT24CXX_ReadOneByte(6*key+3);
                     min=AT24CXX_ReadOneByte(6*key+4);
                     sec=AT24CXX_ReadOneByte(6*key+5);
                     if(pm==0)LCD_ShowChar(60+40,190+20*key,'-',16,0);
                     else LCD_ShowChar(60+40,190+20*key,' ',16,0);
                     LCD_ShowNum(60+40+8,190+20*key,temperature/10,2,16);
                     LCD_ShowNum(60+40+32,190+20*key,temperature%10,1,16);
                     LCD_ShowNum(170,190+20*key,hour,2,16);
                     LCD_ShowNum(170+24,190+20*key,min,2,16);
                     LCD_ShowNum(170+24+24,190+20*key,sec,2,16);
                     }
            delay_ms(1000);
            delay_ms(1000);
            delay_ms(1000);
            LCD_Fill(60,190,239,329,WHITE);
            }

               LCD_ShowString(60,190,200,16,16,"Temp:");
            LCD_ShowString(60+64,190,200,16,16,".");
            LCD_ShowString(60+80,190,200,16,16,"C");
            if(t1==500)                                                    //代表周期为5s
                     {
                     if(x==30)x=0;
                     save=1;
                     t1=0;
                     }
            if(t%10==0)
            {
                     temperature=DS18B20_Get_Temp();
                     if(temperature<0)
                     {
                              LCD_ShowChar(60+40,190,'-',16,0);
                              temperature=-temperature;
                     }else LCD_ShowChar(60+40,190,' ',16,0);
                        LCD_ShowNum(60+40+8,190,temperature/10,2,16);
                        LCD_ShowNum(60+40+32,190,temperature%10,1,16);
            }
               delay_ms(10);
            t++;
            t1++;
            if(t==20)
            {
                     t=0;
                     LED0=!LED0;
            }
      }
}

注释从MDK拷贝过来全变乱码。。我删掉了