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第16届蓝桥杯单片机模拟试题Ⅰ

news 来源：原创 2025/5/25 0:33:59

试题

代码

sys.h

#ifndef __SYS_H__
#define __SYS_H__

#include <STC15F2K60S2.H>
//onewire.c
float getT();
//sys.c
extern unsigned char UI;
extern bit touch_mode;
extern float jiaozhun;
extern float canshu;
extern float temper;
void init74hc138(unsigned char n);
void init();
void get_temper();
void led_ui_touch_c();
//seg_key.c
extern unsigned char Seg_Buff[8];
void Seg_Loop();
void Key_Loop();
void seg_ui();
#endif

main.c

#include "sys.h"
bit flag_seg=0;
bit flag_key=0;
bit flag_temper=0;
void Timer0_Init(void)		//100微秒@12.000MHz
{
	AUXR |= 0x80;			//定时器时钟1T模式
	TMOD &= 0xF0;			//设置定时器模式
	TL0 = 0x50;				//设置定时初始值
	TH0 = 0xFB;				//设置定时初始值
	TF0 = 0;				//清除TF0标志
	TR0 = 1;				//定时器0开始计时
	ET0 = 1;				//使能定时器0中断
	EA = 1;
}
void main(){
	init();
	Timer0_Init();
	while(getT()==85.0);
	while(1){
		led_ui_touch_c();
		if(flag_seg){
			flag_seg=0;
			Seg_Loop();
		}
		if(flag_key){
			flag_key=0;
			Key_Loop();
			seg_ui();
		}
		if(flag_temper){
			flag_temper=0;
			get_temper();
			seg_ui();
		}
	}
}
void Timer0_Isr(void) interrupt 1
{
	static unsigned char count1=0;
	static unsigned char count2=0;
	static unsigned int count3=0;
	count1++;count2++;count3++;
	if(count1==2){
		count1=0;
		flag_seg=1;
	}
	if(count2==50){
		count2=0;
		flag_key=1;
	}
	if(count3==1000){
		count3=0;
		flag_temper=1;
	}
}

sys.c

#include "sys.h"
unsigned char UI=0;//0为温度界面，1为校准值界面，2为参数界面
bit touch_mode=0;//0为上触发模式，1为下触发模式
float jiaozhun=0.0;//校准值
float canshu=26.0;//参数
float temper;
void init74hc138(unsigned char n){
	P2=(P2&0x1f)|(n<<5);
	P2&=0x1f;
}
void init(){
	P0=0x00;
	init74hc138(5);
	P0=0xff;
	init74hc138(4);
}
void get_temper(){
	temper=getT()+jiaozhun;
}
void led(unsigned char addr){
	P0=~(0x01<<(addr-1));
	init74hc138(4);
}
void led_ui_touch_c(){
	switch(UI){
		case 0:
			led(1);break;
		case 1:
			led(2);break;
		case 2:
			led(3);break;
	}
	if(!touch_mode){
		led(4);
		if(temper>canshu) led(8);
	}else{
		led(5);
		if(temper<canshu) led(8);
	}
}

seg_key.c

#include "sys.h"
sbit COL1=P4^4;
sbit COL2=P4^2;
sbit ROW3=P3^2;
sbit ROW4=P3^3;
code unsigned char Seg_Table[] = 
{
0xc0, //0
0xf9, //1
0xa4, //2
0xb0, //3
0x99, //4
0x92, //5
0x82, //6
0xf8, //7
0x80, //8
0x90, //9
0xc6, //C 10
0x86, //E 11
0x89, //H 12
0xbf, //- 13
0xff  //熄灭 14
};
unsigned char Seg_Buff[8]={14,14,14,14,14,14,14,14};
unsigned char keyval,keyold,keyup,keydown;
void seg(unsigned char addr,unsigned char num){
	P0=0xff;
	init74hc138(7);
	P0=0x01<<addr;
	init74hc138(6);
	P0=Seg_Table[num];
	if(UI==0&&addr==6) P0&=0x7f;
	init74hc138(7);
}
void Seg_Loop(){
	static unsigned char i=0;
	seg(i,Seg_Buff[i]);
	i++;
	if(i==8) i=0;
}
unsigned char key_scan(){
	COL1=0;COL2=1;
	if(ROW4==0) return 4;
	if(ROW3==0) return 5;
	COL1=1;COL2=0;
	if(ROW4==0) return 8;
	if(ROW3==0) return 9;
	return 0;
}
void Key_Loop(){
	keyval=key_scan();
	keydown=keyval&(keyold^keyval);
	keyup=~keyval&(keyold^keyval);
	//s4负责切换界面
	if(keyval==4&&keyold!=4){
		UI++;
		if(UI==3) UI=0;
	}
	//s5负责切换触发模式
	if(keyval==5&&keyold!=5){
		touch_mode=~touch_mode;
	}
	//s8负责减
	if(keyval==8&&keyold!=8){
		if(UI==1){
			if(jiaozhun>-99) jiaozhun--;
		}
		if(UI==2){
			if(canshu>-99) canshu--;
		}
	}
	//s9负责加
	if(keyval==9&&keyold!=9){
		if(UI==1){
			if(jiaozhun<99) jiaozhun++;
		}
		if(UI==2){
			if(canshu<99) canshu++;
		}
	}
	keyold=keyval;
	keyval=0;
}
void ui0(){//温度界面
	Seg_Buff[7]=(unsigned char)((temper+0.05)*10)%10;
	Seg_Buff[6]=(unsigned char)(temper+0.05)%10;
	Seg_Buff[5]=(unsigned char)temper/10;
	Seg_Buff[4]=14;
	Seg_Buff[3]=14;
	Seg_Buff[2]=14;
	Seg_Buff[1]=14;
	Seg_Buff[0]=10; //C
}
void ui1(){//校准值界面
	float temp=jiaozhun;
	if(jiaozhun<0) temp=-jiaozhun;
	Seg_Buff[7]=(unsigned char)temp%10;
	if((unsigned char)temp>=10){
		Seg_Buff[6]=(unsigned char)temp/10;
		Seg_Buff[5]=14;
		if(jiaozhun<0)
			Seg_Buff[5]=13;
	}else{
		Seg_Buff[6]=14;
		Seg_Buff[5]=14;
		if(jiaozhun<0)
			Seg_Buff[6]=13;
	}
	Seg_Buff[4]=14;
	Seg_Buff[3]=14;
	Seg_Buff[2]=14;
	Seg_Buff[1]=14;
	Seg_Buff[0]=11; //E
}
void ui2(){//参数界面
	float temp=canshu;
	if(canshu<0) temp=-canshu;
	Seg_Buff[7]=(unsigned char)temp%10;
	if((unsigned char)temp>=10){
		Seg_Buff[6]=(unsigned char)temp/10;
		Seg_Buff[5]=14;
		if(canshu<0)
			Seg_Buff[5]=13;
	}else{
		Seg_Buff[6]=14;
		Seg_Buff[5]=14;
		if(canshu<0)
			Seg_Buff[6]=13;
	}
	Seg_Buff[4]=14;
	Seg_Buff[3]=14;
	Seg_Buff[2]=14;
	Seg_Buff[1]=14;
	Seg_Buff[0]=12; //H
}
void seg_ui(){
	switch(UI){
		case 0:
			ui0();break;
		case 1:
			ui1();break;
		case 2:
			ui2();break;
	}
}

onewire.c

#include "sys.h"
sbit DQ=P1^4;
void Delay_OneWire(unsigned int t)  
{
	unsigned char i;
	while(t--){
		for(i=0;i<12;i++);
	}
}
void Write_DS18B20(unsigned char dat)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		DQ = 0;
		DQ = dat&0x01;
		Delay_OneWire(5);
		DQ = 1;
		dat >>= 1;
	}
	Delay_OneWire(5);
}
unsigned char Read_DS18B20(void)
{
	unsigned char i;
	unsigned char dat;
  
	for(i=0;i<8;i++)
	{
		DQ = 0;
		dat >>= 1;
		DQ = 1;
		if(DQ)
		{
			dat |= 0x80;
		}	    
		Delay_OneWire(5);
	}
	return dat;
}
bit init_ds18b20(void)
{
  	bit initflag = 0;
  	
  	DQ = 1;
  	Delay_OneWire(12);
  	DQ = 0;
  	Delay_OneWire(80);
  	DQ = 1;
  	Delay_OneWire(10); 
    initflag = DQ;     
  	Delay_OneWire(5);
  
  	return initflag;
}
float getT(){
	unsigned char tH,tL;
	float temp;
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	init_ds18b20();
	
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	tL=Read_DS18B20();
	tH=Read_DS18B20();
	temp=(float)(tH<<8|tL)*0.0625;
	return temp;
}