蓝桥杯单片机省赛题目《全集》之第十二届省赛第一场_蓝桥杯第十二届eda真题

师从小蜜蜂，简单易懂，很容易看懂，可以交流提意见。

这道题难度正常，感觉今年的题难度大概就都会这样了，不会再难了

这里的读取eeprom内容，我任务第一次读取的时候，可能会出现随机的内容，所以可以对第一次读取的内容进行个修整，到规范的内容。

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#include "reg52.h"
#include "onewire.h"
#include "iic.h"
sfr P4 = 0xC0;
sbit r1=P3^0;
sbit r2=P3^1;
sbit r3=P3^2;
sbit r4=P3^3;
sbit c1=P4^4;
sbit c2=P4^2;
sbit c3=P3^5;
sbit c4=P3^4;
typedef unsigned char u8;
typedef unsigned int u16;
u8 code duanma[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
u8 code duanma1[10]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};
u8 mode=1;
void display_choose();
void delay(u8 t)
{while(t--);}
void delay1(u8 t)
{while(t--);display_choose();}
 
void hc573(u8 n)
{
	switch(n)
	{
		case 4:P2=(P2&0x1f)|0x80;break;
		case 5:P2=(P2&0x1f)|0xa0;break;
		case 6:P2=(P2&0x1f)|0xc0;break;
		case 7:P2=(P2&0x1f)|0xe0;break;
		case 0:P2=(P2&0x1f)|0x00;break;
		
	}
}
void first()
{
	hc573(4);
	P0=0xff;
	hc573(5);
	P0=0x00;
	hc573(6);
	P0=0x00;
	hc573(7);
	P0=0xff;
}
u16 temp=2000;
void read_wendu()
{
	u8 L,M;
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	delay(1000);
		init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	L=Read_DS18B20();
	M=Read_DS18B20();
	temp=(M<<8)|L;
	if((temp&0xf800)==0x0000)//*
	{
		//temp=(temp>>4)+(L&0x0f)*0.0625;//整型这样做会丢失小数
		temp = (temp>>4) * 100;
		temp = temp + (L & 0x0f) * 6.25;
	}
		//temp=100*temp;
}
u16 ain3=0;
/*
void pcf_adc()
{
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByye(0x03);
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();
	ain3=IIC_RecByte();
	IIC_SendAck(1);
	IIC_Stop();
	ain3=ain3*(500/256);
}*/
void pcf_dac(u8 dat)
{
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByte(0x40);
	IIC_WaitAck();
	IIC_SendByte(dat);
	IIC_WaitAck();
	IIC_Stop();
}
void display(u8 pos,u8 dat)
{
	hc573(7);///xiaoyin
	P0=0xff;///
	hc573(6);
	P0=0x01<<pos;
	hc573(7);
	P0=dat;
	
}
 u8 display_stat=1;
 void displayoff()
 {
 
 	hc573(6);
	P0=0x00;
	hc573(7);
	P0=0xff;
 
 }
void display_1()
{
P0=0xff;
		display(7,duanma[temp%10]);
	delay(500);
		display(6,duanma[(temp%100)/10]);
	delay(500);
		display(5,duanma1[(temp%1000)/100]);
	delay(500);
		display(4,duanma[(temp%10000)/1000]);
	delay(500);
		display(3,0xff);
	delay(500);
		display(2,0xff);
	delay(500);
		display(1,0xff);
	delay(500);
		display(0,0xc6);
	delay(500);
	displayoff();
}
u16 set=25;
void display_2()
{
P0=0xff;
		display(7,duanma[set%10]);
	delay(500);
		display(6,duanma[(set%100)/10]);
	delay(500);
		display(5,0xff);
	delay(500);
		display(4,0xff);
	delay(500);
		display(3,0xff);
	delay(500);
		display(2,0xff);
	delay(500);
		display(1,0xff);
	delay(500);
		display(0,0x8e);
	delay(500);
	displayoff();
}
 
void display_3()
{
P0=0xff;
		display(7,duanma[ain3%10]);
	delay(500);
		display(6,duanma[(ain3%100)/10]);
	delay(500);
		display(5,duanma1[(ain3%1000)/100]);
	delay(500);
		display(4,0xff);
	delay(500);
		display(3,0xff);
	delay(500);
		display(2,0xff);
	delay(500);
		display(1,0xff);
	delay(500);
		display(0,0x88);
	delay(500);
	displayoff();
}
u8 led_stat=0xff;
void led()
{
	P0=0xff;
	hc573(4);
	if(mode==1){led_stat=led_stat&0xfe;}
	else{led_stat=led_stat|0x01;}
	if(display_stat==1){led_stat=led_stat&0xfd;}
	else{led_stat=led_stat|0x02;}
	if(display_stat==2){led_stat=led_stat&0xfb;}
	else{led_stat=led_stat|0x04;}
	if(display_stat==3){led_stat=led_stat&0xf7;}
	else{led_stat=led_stat|0x08;}
	P0=led_stat;
	hc573(0);
}
 
void display_choose()
{
	if(display_stat==1){display_1();}
	else if(display_stat==2){display_2();}
	else if(display_stat==3){display_3();}
	led();
}
void scan()
{
	r4=0;//s4
	r1=r2=r3=1;
	if(c1==0)
	{
		delay(100);
		if(c1==0)
		{
			display_stat=display_stat+1;
			if(display_stat==4){display_stat=1;}
		}
		while(c1==0)
		{
			display_choose();
		}
	}
	if(c2==0)//s8
	{
		delay(100);
		if(c2==0)
		{if(display_stat==2){
			if(set>=10)
				{set=set-1;}
			else if(set<10)
				{set=0;}
		}
		}
		while(c2==0)
		{
			display_choose();
		}
	}
	r3=0;//s4
	r1=r2=r4=1;
	if(c1==0)//s5
	{
		delay(100);
		if(c1==0)
		{
			mode=~mode;
		}
		while(c1==0)
		{
			display_choose();
		}
	}
	if(c2==0)//s9
	{
		delay(100);
		if(c2==0)
		{	if(display_stat==2){
			set=set+1;}
		}
		while(c2==0)
		{display_choose();}
	}
}
 
void mode_choose()
{
	if(mode==1)
	{
		if(temp<(set*100))
		{ain3=0;}
		else{ain3=500;}
	}
	else
	{
		if (temp <= 2000)
		{
			ain3 = 100;
		}
		else if ((temp < 4000) & (temp > 2000))
		{
			ain3 = ((temp - 2000) * (3 / 20) + 100);//整型这样算会丢失小数
			ain3 = ((temp - 2000) * 3) / 20 + 100;
		}
		else{ain3=400;}
	}
}
u8 cnt = 0;
void main()
{
	first();
	while(1)
	{
		cnt++;
		if (cnt % 5 == 0)
			//pcf_adc();
		{
			read_wendu();
		}
		if (cnt % 4 == 0)
		{
			pcf_dac(ain3 * (255 / 500));
		}
		scan();
		mode_choose();
		display_choose();
		
	}
}
 
 
 
 
 
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