【第十三届蓝桥杯单片机省赛冲刺-巩固练习2】

第十三届蓝桥杯单片机省赛冲刺-巩固练习2

练习题目来自小蜜蜂老师微信公众号

一、按键长按短与短按

#include "reg52.h"

//定义S4按键
sbit S4 = P3^3;
unsigned char t_count = 0,s_press = 0,value =28;	//计时，按键长按标志，数值
unsigned char code smg_data[18]={0xc0,0xf9,
    0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
    0x88,0x80,0xc6,0xc0,0x86,0x8e,0xbf,0x7f};	//段码




//简单延时
void delay(unsigned int t)
{
	while(t--);
}

//锁存器初始化
void Init_74HC138(unsigned char channel)
{
 	switch(channel)
	{
	 	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;
	}
		P2 = (P2 & 0x1f) | 0x00;
}

//操作所有数码管
void SMG_All(unsigned char dat)
{	
	P0 = 0xff;
	Init_74HC138(6);
	P0 = dat;
	Init_74HC138(7);
}


//数码管安位操作
void SMG_DisplayBit(unsigned char pos,unsigned char dat)
{
 	P0 = (0x01 << pos);
	Init_74HC138(6);
	P0 = dat;
	Init_74HC138(7);
}

//数码管显示数据
void SMG_Display_Data(void)
{
	SMG_DisplayBit(0,0xff);
	delay(200);
	SMG_DisplayBit(1,0xff);
	delay(200);
	SMG_DisplayBit(2,0xff);
	delay(200);
	SMG_DisplayBit(3,0xff);
	delay(200);
	SMG_DisplayBit(4,0xff);
	delay(200);
	SMG_DisplayBit(5,0xff);
	delay(200);
	SMG_DisplayBit(6,smg_data[value/10]);
	delay(200);
	SMG_DisplayBit(6,0xff);
	delay(200);
	SMG_DisplayBit(7,smg_data[value%10]);
	delay(200);
	SMG_DisplayBit(7,0xff);
	SMG_All(0xff);
	delay(200);
}





//系统初始化
void Init_System(void)
{
 	P0 = 0xff;
	Init_74HC138(4);
	P0 = 0x00;
	Init_74HC138(5);
	SMG_All(0xff);
}


//按键处理
void Key_Scan(void)
{
 	if(S4 == 0)
	{
		delay(20);
		if(S4 == 0)
		{
			//这里一定注意要将标志位和计时清零
			s_press = 0;
			t_count = 0;
		 	while(S4 == 0)
			{
			 	SMG_Display_Data();
			}
			if(s_press == 1) //长按模式
			{
			 	value = 0;
			}
			else	  //短按模式
			{
				value++;
				if(value > 99)
				{
				 	value = 0;
				}
			}
			
		}
	}
}

//定时器初始化
void Init_Timer(void)
{
 	TMOD = 0x01;
	TH0  =(65535-10000)/256;	//10ms
	TL0  =(65535-10000)%256;
	ET0  = 1;
	TR0  = 1;
	EA   = 1;
}
//主函数
void main(void)
{
 	Init_System();
	Init_Timer();
	while(1)
	{
	 	Key_Scan();
		SMG_Display_Data();
	}
}

//定时器中断处理

void Server_Timer0() interrupt 1
{
 	TH0 = (65535-10000)/256;
	TL0 = (65535-10000)%256;
	t_count++;
	if(t_count == 100) //1s
	{
	 	s_press = 1;  //长按标志
	}
}

二、采样光敏与可调电阻电压

#include "reg52.h"
#include "iic.h"

unsigned char rd1_value = 0,rd2_value = 0; //光敏与电阻采样变量
unsigned int smg_value1 = 0,smg_value2 =0; //数码管显示
//不带小数点段码
unsigned char code smg_data[18]={0xc0,0xf9,
    0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
    0x88,0x80,0xc6,0xc0,0x86,0x8e,0xbf,0x7f};
//带小数点段码
unsigned char code smg_data_dot[10]={0x40,0x79,
    0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};

//简单延时
void delay(unsigned int t)
{
 	while(t--);
}

//锁存器初始化
void Init_74HC138(unsigned char channel)
{
	switch(channel)
	{
	 	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;
	}
		P2 = (P2 & 0x1f) | 0x00;
}

//数码管安位操作
void SMG_DisplayBit(unsigned char pos,unsigned char dat)
{
 	P0 = (0x01 << pos);
	Init_74HC138(6);
	P0 = dat;
	Init_74HC138(7);
}

//操作所有数码管
void SMG_All(unsigned char dat)
{
 	P0  = 0xff;
	Init_74HC138(6);
	P0 = dat;
	Init_74HC138(7);
}


//数码管数据显示
void SMG_Display_V(void)
{
	//光敏电压显示
	 SMG_DisplayBit(0,smg_data_dot[smg_value1/100]);
	 delay(200);
	 SMG_DisplayBit(0,0xff);
	 delay(200);
	 SMG_DisplayBit(1,smg_data[smg_value1/10%10]);
	 delay(200);
	 SMG_DisplayBit(1,0xff);
	 delay(200);
	 SMG_DisplayBit(2,smg_data[smg_value1%10]);
	 delay(200);
	 SMG_DisplayBit(2,0xff);
	 delay(200);
	 SMG_DisplayBit(3,0xff);
	 delay(200);
	 SMG_DisplayBit(4,0xff);
	 delay(200);
	 //电阻电压显示
	 SMG_DisplayBit(5,smg_data_dot[smg_value2/100]);
	 delay(200);
	 SMG_DisplayBit(5,0xff);
	 SMG_DisplayBit(6,smg_data[smg_value2/10%10]);
	 delay(200);
	 SMG_DisplayBit(6,0xff);
	 delay(200);
	 SMG_DisplayBit(7,smg_data[smg_value2%10]);
	 delay(200);
	 SMG_DisplayBit(7,0xff);
	 delay(200);
	 SMG_All(0xff);
	 delay(200);
}

//读取光敏数据
void Read_AD1(void)
{
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();	
	IIC_SendByte(0x01);
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();	
	rd1_value = IIC_RecByte();
	IIC_SendAck(1);
	IIC_Stop();
	smg_value1 = rd1_value * (5.0/255) * 100;
}

//读取电阻数据
void Read_AD2(void)
{
	 
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();	
	IIC_SendByte(0x03);
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();	
	rd2_value = IIC_RecByte();
	IIC_SendAck(1);
	IIC_Stop();
	smg_value2 = rd2_value * (5.0/255) * 100;
}


//系统初始化
void Init_System(void)
{
 	P0 = 0xff;
	Init_74HC138(4);
	P0 = 0x00;
	Init_74HC138(5);
	SMG_All(0xff);
}


//主函数
void main(void)
{
 	Init_System();
	while(1)
	{
			Read_AD1();
			Read_AD2();
			SMG_Display_V();
	}
}

三、基于PCF8591的DAC模拟电压输出

#include "reg52.h"
#include "iic.h"


sbit S4 = P3^3;	//引脚定义
unsigned char mode = 1; //输出模式
unsigned int volt_value = 0,ad_value = 0;	 //数码管显示电压、采样变量
//不带小数点段码
unsigned char code smg_data[18]={0xc0,0xf9,
    0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
    0x88,0x80,0xc6,0xc0,0x86,0x8e,0xbf,0x7f};
//带小数点段码
unsigned char code smg_data_dot[10]={0x40,0x79,
    0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};


//简单延时
void delay(unsigned int t )
{
 	while(t--);
}

//锁存器初始化
void Init_74HC138(unsigned char channel)
{
 	switch(channel)
	{
	 	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;
	}
		P2 = (P2 & 0x1f) | 0x00;
}

//数码管安位操作
void  SMG_DisplayBit(unsigned char pos,unsigned char dat)
{
 	P0 = (0x01 << pos);
	Init_74HC138(6);
	P0 = dat;
	Init_74HC138(7);
}

//操作所有数码管
void SMG_All(unsigned char dat)
{
 	P0 = 0xff;
	Init_74HC138(6);
	P0 = dat;
	Init_74HC138(7);
}

//数码管数据显示
void SMG_Display_Data(void)
{
	 SMG_DisplayBit(0,0xbf);
	 delay(200);
	 SMG_DisplayBit(0,0xff);
	 delay(200);
	 SMG_DisplayBit(1,smg_data[mode]);
	 delay(200);
	 SMG_DisplayBit(1,0xff);
	 delay(200);
	 SMG_DisplayBit(2,0xbf);
	 delay(200);
	 SMG_DisplayBit(2,0xff);
	 delay(200);
	 SMG_DisplayBit(3,0xff);
	 delay(200);
	 SMG_DisplayBit(4,0xff);
	 delay(200);
	 SMG_DisplayBit(5,smg_data_dot[volt_value/100]);
	 delay(200);
	 SMG_DisplayBit(5,0xff);
	 delay(200);
	 SMG_DisplayBit(6,smg_data[volt_value/10%10]);
	 delay(200);
	 SMG_DisplayBit(6,0xff);
	 delay(200);
	 SMG_DisplayBit(7,smg_data[volt_value%10]);
	 delay(200);
	 SMG_DisplayBit(7,0xff);
	 delay(200);
	 SMG_All(0xff);
	 delay(200);

}	

//PCF8591数据读取
void Read_ADC(void)
{
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByte(0x43);
	IIC_WaitAck();
	IIC_Stop();

	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();
	ad_value = IIC_RecByte();
	IIC_SendAck(1);
	IIC_Stop();
	volt_value = ad_value * (5.0/255)* 100;
}

void Read_DAC(float dat)
{
 	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByte(0x43);
	IIC_WaitAck();
	IIC_SendByte(dat);
	IIC_WaitAck();
	IIC_Stop();
}



//系统初始化
void Init_System(void)
{
 	P0 = 0xff;
	Init_74HC138(4);
	P0 = 0x00;
	Init_74HC138(5);
	SMG_All(0xff);
}


//按键处理
void Key_Scans(void)
{
 	if(S4 == 0)
	{
	 	delay(20);
		if(S4 == 0)
		{
		 	while(S4 == 0)
			{
			 		SMG_Display_Data();
			}
			if(mode == 1)
			{
			 	mode = 2;
			}
			else if(mode == 2)
			{
			 	mode = 3;
			}
			else if(mode == 3)
			{
				mode = 1;
			}

		}
	}
}
//主函数
void main(void)
{
 	Init_System();
	while(1)
	{
			Key_Scans();
			switch(mode)
			{
			 	case 1:Read_DAC(102);volt_value = 2*100;break;
				case 2:Read_DAC(204);volt_value = 4*100;break;
				case 3:Read_ADC();Read_DAC(ad_value);break;
			}
			SMG_Display_Data();
	}

}