在一个寒假的准备中，/image/MQ%3D%3D5单片机各个模块应经有了一个充分的认识，对其内部原理以及程序控制已经熟练掌握，在距离省赛蓝桥杯不到/image/MQ%3D%3D0天的时间里，每天练习一套省赛模拟题，来提高各个模块的综合应用。
此次省赛试题中主要使用了DS/image/MQ%3D%3D302和DS/image/MQ%3D%3D8B20两个模块，整套题难度算中上吧。本题难度在于温度采集时间设置和采集温度的逐一读取。我在程序设计中，使用了一个数组和两个索引的方法，将采集的温度逐一保存，然后再通过另一个索引将其读出。这个方法比较容易理解并且代码不易出错。在一个就是定时器的使用。本实验使用了一个定时器0，就很好的解决了一大堆延时问题。整个代码中没有使用while（）函数来进行延时，因为使用过程中while（）会慢慢地拖垮整个系统，导致系统定时不准。这个实验对定时的要求还是挺高的，所以一次也不使用while（）延时！
行了，闲话不多说，一起来看看实验效果和代码吧！
读取温度检测数值！
#include "STC/image/MQ%3D%3D5F2K60S2.h"
#include "onewire.h"
#include "ds/image/MQ%3D%3D302.h"
#define u8 unsigned char
unsigned char code smg_du[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x00};
unsigned char code smg_wei[]={0x0/image/MQ%3D%3D,0x02,0x04,0x08,0x/image/MQ%3D%3D0,0x20,0x40,0x80};
#define KEY P3
#define NO_KEY 0xff //?????????
#define KEY_STATE0 0 //?ж????????
#define KEY_STATE/image/MQ%3D%3D /image/MQ%3D%3D //??????????
#define KEY_STATE2 2 //???
unsigned char Key_Scan()
{
static unsigned char key_state=KEY_STATE0;
u8 key_value=0,key_temp;
u8 key/image/MQ%3D%3D,key2;
P30=0;P3/image/MQ%3D%3D=0;P32=0;P33=0;P34=/image/MQ%3D%3D;P35=/image/MQ%3D%3D;P42=/image/MQ%3D%3D;P44=/image/MQ%3D%3D;
if(P44==0) key/image/MQ%3D%3D=0x70;
if(P42==0) key/image/MQ%3D%3D=0xb0;
if(P35==0) key/image/MQ%3D%3D=0xd0;
if(P34==0) key/image/MQ%3D%3D=0xe0;
if((P34==/image/MQ%3D%3D)&&(P35==/image/MQ%3D%3D)&&(P42==/image/MQ%3D%3D)&&(P44==/image/MQ%3D%3D)) key/image/MQ%3D%3D=0xf0;
P30=/image/MQ%3D%3D;P3/image/MQ%3D%3D=/image/MQ%3D%3D;P32=/image/MQ%3D%3D;P33=/image/MQ%3D%3D;P34=0;P35=0;P42=0;P44=0;
if(P30==0) key2=0x0e;
if(P3/image/MQ%3D%3D==0) key2=0x0d;
if(P32==0) key2=0x0b;
if(P33==0) key2=0x07;
if((P30==/image/MQ%3D%3D)&&(P3/image/MQ%3D%3D==/image/MQ%3D%3D)&&(P32==/image/MQ%3D%3D)&&(P33==/image/MQ%3D%3D)) key2=0x0f;
key_temp=key/image/MQ%3D%3D|key2;
switch(key_state)
{
case KEY_STATE0:
if(key_temp!=NO_KEY)
{
key_state=KEY_STATE/image/MQ%3D%3D;
}
break;
case KEY_STATE/image/MQ%3D%3D:
if(key_temp==NO_KEY)
{
key_state=KEY_STATE0;
}
else
{
switch(key_temp)
{
case 0x77: key_value=4;break;
case 0x7b: key_value=5;break;
case 0x7d: key_value=6;break;
case 0x7e: key_value=7;break;
case 0xb7: key_value=8;break;
case 0xbb: key_value=9;break;
case 0xbd: key_value=/image/MQ%3D%3D0;break;
case 0xbe: key_value=/image/MQ%3D%3D/image/MQ%3D%3D;break;
case 0xd7: key_value=/image/MQ%3D%3D2;break;
case 0xdb: key_value=/image/MQ%3D%3D3;break;
case 0xdd: key_value=/image/MQ%3D%3D4;break;
case 0xde: key_value=/image/MQ%3D%3D5;break;
case 0xe7: key_value=/image/MQ%3D%3D6;break;
case 0xeb: key_value=/image/MQ%3D%3D7;break;
case 0xed: key_value=/image/MQ%3D%3D8;break;
case 0xee: key_value=/image/MQ%3D%3D9;break;
}
key_state=KEY_STATE2;
}
break;
case KEY_STATE2:
if(key_temp==NO_KEY)
{
key_state=KEY_STATE0;
}
break;
}
return key_value;
}
void Timer_Init(void) ///image/MQ%3D%3Dms
{
AUXR |= 0x80; ///image/MQ%3D%3DT timer
TMOD &= 0xF0; // /image/MQ%3D%3D6bit
TL0 = 0xCD;
TH0 = 0xD4;
TF0 = 0;
TR0 = /image/MQ%3D%3D;
ET0 = /image/MQ%3D%3D;
EA=/image/MQ%3D%3D;
}
bit key_flag;
bit blink_flag;
bit temp_caiji_flag;
bit real_temp_flag;
bit led_flag;
bit led_blink_flag;
u8 one_display[8];
u8 two_display[8];
u8 temp_caiji[/image/MQ%3D%3D0];
u8 three_display[8];
u8 mode;
u8 set_time=/image/MQ%3D%3D;
u8 jiajia;
u8 shi,fen,miao;
u8 temp_time;
u8 temp_caiji_inedx;
u8 real_inedx;
void main(void)
{
u8 key_val=NO_KEY;
P2=0xa0;P0=0x00;P2=0x00; // close buzzer and relay
set_sfm(23,59,50);
Timer_Init(); ///image/MQ%3D%3Dms
while(/image/MQ%3D%3D)
{
one_display[0]=0x00;
one_display[/image/MQ%3D%3D]=0x00;
one_display[2]=0x00;
one_display[3]=0x00;
one_display[4]=0x00;
one_display[5]=0x40;
one_display[6]=smg_du[set_time//image/MQ%3D%3D0];
one_display[7]=smg_du[set_time%/image/MQ%3D%3D0];
shi=Read_Ds/image/MQ%3D%3D302 (0x85);
fen=Read_Ds/image/MQ%3D%3D302 (0x83);
miao=Read_Ds/image/MQ%3D%3D302 (0x8/image/MQ%3D%3D);
two_display[0]=smg_du[shi//image/MQ%3D%3D6];
two_display[/image/MQ%3D%3D]=smg_du[shi%/image/MQ%3D%3D6];
two_display[3]=smg_du[fen//image/MQ%3D%3D6];
two_display[4]=smg_du[fen%/image/MQ%3D%3D6];
two_display[6]=smg_du[miao//image/MQ%3D%3D6];
two_display[7]=smg_du[miao%/image/MQ%3D%3D6];
three_display[0]=0x40;
three_display[/image/MQ%3D%3D]=smg_du[real_inedx//image/MQ%3D%3D0];
three_display[2]=smg_du[real_inedx%/image/MQ%3D%3D0];
three_display[3]=0x00;
three_display[4]=0x00;
three_display[5]=0x40;
three_display[6]=smg_du[temp_caiji[real_inedx]//image/MQ%3D%3D0];
three_display[7]=smg_du[temp_caiji[real_inedx]%/image/MQ%3D%3D0];
if(real_temp_flag)
{
real_temp_flag=0;
if(temp_caiji_inedx</image/MQ%3D%3D0)
{
temp_caiji[temp_caiji_inedx]=rd_temperature();
temp_caiji_inedx++;
}
else
{
temp_caiji_flag=0;
led_flag=/image/MQ%3D%3D;
mode=2;
}
}
if(key_flag) ///image/MQ%3D%3D0ms
{
key_flag=0;
key_val=Key_Scan();
switch(key_val)
{
case 4:if(mode==0)
{
jiajia++;
if(jiajia==4)
{
jiajia=0;
}
if(jiajia==0)
{
set_time=/image/MQ%3D%3D;
}
if(jiajia==/image/MQ%3D%3D)
{
set_time=5;
}
if(jiajia==2)
{
set_time=30;
}
if(jiajia==3)
{
set_time=60;
}
}
break;
case 5:
if(mode==0)
{
mode=/image/MQ%3D%3D;
temp_caiji_flag=/image/MQ%3D%3D;
temp_time=set_time;
}
break;
case 6:
led_flag=0;
real_inedx++;
if(real_inedx==/image/MQ%3D%3D0)
{
real_inedx=0;
}
break;
case 7:
mode=0;
set_time=/image/MQ%3D%3D;
real_inedx=0;
temp_caiji_inedx=0;
break;
}
}
}
}
void timer0() interrupt /image/MQ%3D%3D using /image/MQ%3D%3D
{
static int key_count=0,smg_count=0,blink_smg_count=0,temp_count,led_count=0,i=0;
key_count++;smg_count++;
if(key_count==/image/MQ%3D%3D0) ///image/MQ%3D%3D0ms
{
key_count=0;
key_flag=/image/MQ%3D%3D;
}
if(led_flag)
{
led_count++;
if(led_count==/image/MQ%3D%3D000)
{
led_count=0;
led_blink_flag=~led_blink_flag;
if(led_blink_flag)
{
P2=0X80;P0=~0X0/image/MQ%3D%3D;P2=0X00;
}
else
{
P2=0X80;P0=0XFF;P2=0X00;
}
}
}
else
{
P2=0X80;P0=0XFF;P2=0X00;
}
if(mode==/image/MQ%3D%3D)
{
blink_smg_count++;
if(blink_smg_count==/image/MQ%3D%3D000)
{
blink_smg_count=0;
blink_flag=~blink_flag;
if(blink_flag)
{
two_display[2]=0x40;
two_display[5]=0x40;
}
else
{
two_display[2]=0x00;
two_display[5]=0x00;
}
}
}
if(smg_count==3) //3ms
{
smg_count=0;
P2=0xc0;P0=0;P2=0;
if(mode==0)
{
P2=0xe0;P0=~one_display[i];P2=0;
}
if(mode==/image/MQ%3D%3D)
{
P2=0xe0;P0=~two_display[i];P2=0;
}
if(mode==2)
{
P2=0xe0;P0=~three_display[i];P2=0;
}
P2=0xc0;P0=smg_wei[i];P2=0;
i++;
if(i==8) i=0;
}
if(temp_caiji_flag==/image/MQ%3D%3D)
{
temp_count++;
if(temp_count==temp_time*/image/MQ%3D%3D000)
{
temp_count=0;
real_temp_flag=/image/MQ%3D%3D;
}
}
}