第十一届“蓝桥杯”单片机省赛——程序设计题

个人编写，代码仅供参考

如有不足，多多指教

1.题目

2.代码

main.c程序

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

uchar code smg[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xFF,0xc1,0x8e,0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,0x8c,0xc8};
//                    0    1    2    3    4    5    6     7   8    9    -   mie		U    F    0.   1.    2.  3.   4.   5.   6.   7.   8.   9.   p    n


//===========================延时函数

void delay_smg(uint time)
{
	while(time--);
}
//===========================参数定义
sfr P4 = 0xC0;
sfr AUXR = 0x8E;
sbit c3 = P3^5;
sbit c4 = P3^4;

//================================
uchar xianshi_flag = 1;//    1 : 数据显示界面    2 : 参数显示界面    3  ：计数显示界面

uchar wuxiaocishu = 0;//无效次数

uint count_flag = 0;//定时器计数标志，达到5s，led1亮起

uchar comp_flag = 0;//比较标志位
uchar count = 0;//计数值

float vp;//Vp的值 上电之后的值来自eeprom
uchar vain3_temp;//0~255
#define vain3 5*((float)vain3_temp/255)
//电位器的实际电压


uchar led1_flag = 0;//1 亮  0 暗

//===========================函数定义
void init();
void select(uchar channel);
void read_vp_eeprom();
void key_scan();
void smg_show();
void Timer1Init(void);		//1毫秒@12.000MHz
void led_show();


//====================================
void main()
{
	init();
	Timer1Init();
	//write_24c02(0x00 ,40); 初始化写入4.00伏的vp
	while(1)
	{
		read_vp_eeprom();
		vain3_temp = read_pcf_ain3();
		if(vp < vain3)
			{
				comp_flag = 1;
			}
		if(vp >= vain3 && comp_flag == 1)
			{
				if(count + 1 >=100)
					{
						comp_flag = 0;
						count = 0;
					}
				else
					{
						comp_flag = 0;
						count++;
					}
			}
		key_scan();
		led_show();
		smg_show();
	}
}
//==========================初始化函数
void select(uchar 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;
	}
}


void init()
{
	select(5);
	P0 &= 0xAF;
	select(4);
	P0 = 0xFF;
	select(6);
	P0 = 0xFF;
	select(7);
	P0 = smg[11];
	select(0);
	P0 = 0xFF;
}
//=============================按键扫描函数
void key_scan()
{
	P3 = (P3 & 0xF0) | 0x07;
	c3 = c4 = 1;
	if(c3 == 0)//S12按下
	{
		smg_show();
		if(c3 == 0)
		{
			while(c3 == 0)
			{
				smg_show();
			}
			switch(xianshi_flag)
			{
				case 1 : xianshi_flag = 2;wuxiaocishu = 0;break;
				case 2 : xianshi_flag = 3;wuxiaocishu = 0;break;
				case 3 : xianshi_flag = 1;wuxiaocishu = 0;break;
			}
		}
	}
	else if(c4 == 0)//S16按下
	{
		smg_show();
		if(c4 == 0)
		{
			while(c4 == 0)
			{
				smg_show();
			}
			if(xianshi_flag == 2)
			{
				wuxiaocishu = 0;
				if(vp + 0.50 <= 5.00)
				{vp += 0.50;  write_24c02(0x00 ,vp*10);}
				else
				{vp = 0.00;  write_24c02(0x00 ,vp*10);}
			}
			else
			{
				wuxiaocishu++;
			}
		}
	}
	
	P3 = (P3 & 0xF0) | 0x0B;
	c3 = c4 = 1;
	if(c3 == 0)//S13按下
	{
		smg_show();
		if(c3 == 0)
		{
			while(c3 == 0)
			{
				smg_show();
			}
			if(xianshi_flag == 3)
			{
				wuxiaocishu = 0;
				count = 0;
			}
			else
			{
				wuxiaocishu++;
			}
		}
	}
	else if(c4 == 0)//S17按下
	{
		smg_show();
		if(c4 == 0)
		{
			while(c4 == 0)
			{
				smg_show();
			}
			if(xianshi_flag == 2)
			{
				wuxiaocishu = 0;
				if(vp - 0.50 >= 0.00)
				{vp -= 0.50;  write_24c02(0x00 ,vp*10);}
				else
				{vp = 5.00;  write_24c02(0x00 ,vp*10);}
			}
			else
			{
				wuxiaocishu++;
			}
		}
	}
}
//============================读出eeprom中的vp*10值
void read_vp_eeprom()
{
	vp = ((float)read_24c02(0x00))/10;
}
//============================数码管函数
void smg_dis(uchar pos,uchar val)
{
	select(6);
	P0 = 0x01 << pos;
	select(7);
	P0 = smg[val];
	select(0);
	P0 = 0xFF;
	delay_smg(800);
}

void smg_show()
{
	if(xianshi_flag == 1)
	{
		smg_dis(0,12);
		smg_dis(1,11);
		smg_dis(2,11);
		smg_dis(3,11);
		smg_dis(4,11);
		smg_dis(5,((int)((vain3*100))/100)+14);
		smg_dis(6,(((int)((vain3*100))/10))%10);
		smg_dis(7,((int)((vain3*100)))%10);
	}
	else if(xianshi_flag == 2)
	{
		smg_dis(0,24);
		smg_dis(1,11);
		smg_dis(2,11);
		smg_dis(3,11);
		smg_dis(4,11);
		smg_dis(5,((int)((vp*100))/100)+14);
		smg_dis(6,(((int)((vp*100))/10))%10);
		smg_dis(7,((int)((vp*100)))%10);
	}
	else if(xianshi_flag == 3)
	{
		smg_dis(0,25);
		smg_dis(1,11);
		smg_dis(2,11);
		smg_dis(3,11);
		smg_dis(4,11);
		smg_dis(5,11);
		smg_dis(6,count/10);
		smg_dis(7,count%10);
	}
}

//=============================定时器1用来计算vp>vain3的时间
void Timer1Init(void)		//1毫秒@12.000MHz
{
	AUXR &= 0xBF;		//定时器时钟12T模式
	TMOD &= 0x0F;		//设置定时器模式
	TL1 = 0x18;		//设置定时初始值
	TH1 = 0xFC;		//设置定时初始值
	TF1 = 0;		//清除TF1标志
	
	ET1 = EA = 1;
	
	TR1 = 1;		//定时器1开始计时
}

void ser_timer1() interrupt 3
{
	if(vp > vain3)
	{
		count_flag++;
		if(count_flag == 5000)
		{
		led1_flag = 1;
		}
	}
	else if(vp <= vain3)
	{
		led1_flag = 0;
		count_flag = 0;
	}
}
//================================led函数
void led_show()
{
	if(led1_flag == 1)
	{
		select(4);
		P0 &= 0xFE;//xxxx xxx0
		select(0);
	}
	else if(led1_flag ==0)
	{
		select(4);
		P0 |= 0x01;//xxxx xxx1
		select(0);
	}
	if(count %2 == 1)
	{
		select(4);
		P0 &= 0xFd;//xxxx xx0x
		select(0);
	}
	else if(count %2 == 0)
	{
		select(4);
		P0 |= 0x02;//xxxx xx1x
		select(0);
	}
	if(wuxiaocishu >= 3)
	{
		select(4);
		P0 &= 0xfb;//xxxx x0xx
		select(0);
	}
	else if(wuxiaocishu < 3)
	{
		select(4);
		P0 |= 0x04;//xxxx x1xx
		select(0);
	}
}

iic.c程序


#include "reg52.h"
#include "intrins.h"

#define DELAY_TIME 5

#define SlaveAddrW 0xA0
#define SlaveAddrR 0xA1

//总线引脚定义
sbit SDA = P2^1;  
sbit SCL = P2^0;  

void IIC_Delay(unsigned char i)
{
    do{_nop_();}
    while(i--);        
}
//总线启动条件
void IIC_Start(void)
{
    SDA = 1;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 0;
    IIC_Delay(DELAY_TIME);
    SCL = 0;	
}

//总线停止条件
void IIC_Stop(void)
{
    SDA = 0;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}

//发送应答
void IIC_SendAck(bit ackbit)
{
    SCL = 0;
    SDA = ackbit;  					// 0：应答，1：非应答
    IIC_Delay(DELAY_TIME);
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SCL = 0; 
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}

//等待应答
bit IIC_WaitAck(void)
{
    bit ackbit;
	
    SCL  = 1;
    IIC_Delay(DELAY_TIME);
    ackbit = SDA;
    SCL = 0;
    IIC_Delay(DELAY_TIME);
    return ackbit;
}

//通过I2C总线发送数据
void IIC_SendByte(unsigned char byt)
{
    unsigned char i;

    for(i=0; i<8; i++)
    {
        SCL  = 0;
        IIC_Delay(DELAY_TIME);
        if(byt & 0x80) SDA  = 1;
        else SDA  = 0;
        IIC_Delay(DELAY_TIME);
        SCL = 1;
        byt <<= 1;
        IIC_Delay(DELAY_TIME);
    }
    SCL  = 0;  
}

//从I2C总线上接收数据
unsigned char IIC_RecByte(void)
{
    unsigned char i, da;
    for(i=0; i<8; i++)
    {   
    	SCL = 1;
	IIC_Delay(DELAY_TIME);
	da <<= 1;
	if(SDA) da |= 1;
	SCL = 0;
	IIC_Delay(DELAY_TIME);
    }
    return da;    
}

//==============================

uchar read_pcf_ain3()
{
	uchar ain3;
	//伪写操作
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByte(0x03);
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();
	ain3 = IIC_RecByte();
	IIC_SendAck(1);
	IIC_Stop();
	
	return ain3;
}



uchar read_24c02(uchar addr)
{
	uchar temp;
	//伪写操作
	IIC_Start();
	IIC_SendByte(0xa0);
	IIC_WaitAck();
	IIC_SendByte(addr);
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0xa1);
	IIC_WaitAck();
	temp = IIC_RecByte();
	IIC_SendAck(1);
	IIC_Stop();
	
	return temp;
}

void write_24c02(uchar addr ,uchar dat)
{
	IIC_Start();
	IIC_SendByte(0xa0);
	IIC_WaitAck();
	IIC_SendByte(addr);
	IIC_WaitAck();
	IIC_SendByte(dat);
	IIC_WaitAck();
	IIC_Stop();
}

iic.h程序

#ifndef _IIC_H
#define _IIC_H

void IIC_Start(void); 
void IIC_Stop(void);  
bit IIC_WaitAck(void);  
void IIC_SendAck(bit ackbit); 
void IIC_SendByte(unsigned char byt); 
unsigned char IIC_RecByte(void); 

void write_24c02(uchar addr ,uchar dat);
uchar read_24c02(uchar addr);

uchar read_pcf_ain3();
#endif

第十一届“蓝桥杯”单片机省赛——程序设计题

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