蓝桥杯单片机第九届国赛 真题＋代码

 

 

iic.c

/*	#   I2C代码片段说明
	1. 	本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
	2. 	参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题
		中对单片机时钟频率的要求，进行代码调试和修改。
*/
#include <STC15F2K60S2.H>
#include "iic.h"
#include "intrins.h"

sbit scl = P2^0;
sbit sda = P2^1;

#define DELAY_TIME	5

//
static void I2C_Delay(unsigned char n)
{
    do
    {
        _nop_();_nop_();_nop_();_nop_();_nop_();
        _nop_();_nop_();_nop_();_nop_();_nop_();
        _nop_();_nop_();_nop_();_nop_();_nop_();		
    }
    while(n--);      	
}

//
void I2CStart(void)
{
    sda = 1;
    scl = 1;
	I2C_Delay(DELAY_TIME);
    sda = 0;
	I2C_Delay(DELAY_TIME);
    scl = 0;    
}

//
void I2CStop(void)
{
    sda = 0;
    scl = 1;
	I2C_Delay(DELAY_TIME);
    sda = 1;
	I2C_Delay(DELAY_TIME);
}

//
void I2CSendByte(unsigned char byt)
{
    unsigned char i;
	
    for(i=0; i<8; i++){
        scl = 0;
		I2C_Delay(DELAY_TIME);
        if(byt & 0x80){
            sda = 1;
        }
        else{
            sda = 0;
        }
		I2C_Delay(DELAY_TIME);
        scl = 1;
        byt <<= 1;
		I2C_Delay(DELAY_TIME);
    }
	
    scl = 0;  
}

//
unsigned char I2CReceiveByte(void)
{
	unsigned char da;
	unsigned char i;
	for(i=0;i<8;i++){   
		scl = 1;
		I2C_Delay(DELAY_TIME);
		da <<= 1;
		if(sda) 
			da |= 0x01;
		scl = 0;
		I2C_Delay(DELAY_TIME);
	}
	return da;    
}

//
unsigned char I2CWaitAck(void)
{
	unsigned char ackbit;
	
    scl = 1;
	I2C_Delay(DELAY_TIME);
    ackbit = sda; 
    scl = 0;
	I2C_Delay(DELAY_TIME);
	
	return ackbit;
}

//
void I2CSendAck(unsigned char ackbit)
{
    scl = 0;
    sda = ackbit; 
	I2C_Delay(DELAY_TIME);
    scl = 1;
	I2C_Delay(DELAY_TIME);
    scl = 0; 
	sda = 1;
	I2C_Delay(DELAY_TIME);
}

unsigned int Read_PCF8591()
{
	unsigned int temp;
	I2CStart();
	I2CSendByte(0x90);
	I2CWaitAck();
	I2CSendByte(0x03);
	I2CWaitAck();
	I2CStart();
	I2CSendByte(0x91);
	I2CWaitAck();
	temp = I2CReceiveByte();
	I2CSendAck(1);
	I2CStop();
	return temp;
}

void Write_AT24C02_Page(unsigned char *buf,unsigned char num)
{
	I2CStart();
	I2CSendByte(0xa0);
	I2CWaitAck();
	I2CSendByte(0x00);
	I2CWaitAck();
	while(num--)
	{
		I2CSendByte(*buf++);
		I2CWaitAck();
	}
	I2CStop();
}
void Read_AT24C02_Page(unsigned char *buf,unsigned char num)
{
	I2CStart();
	I2CSendByte(0xa0);
	I2CWaitAck();
	I2CSendByte(0x00);
	I2CWaitAck();
	I2CStart();
	I2CSendByte(0xa1);
	I2CWaitAck();
	while(num--)
	{
		*buf++ = I2CReceiveByte();
		if(num)	I2CSendAck(0);
		else	I2CSendAck(1);
	}
	I2CStop();
}

 iic.h

#ifndef __iic_h
#define __iic_h

static void I2C_Delay(unsigned char n);
void I2CStart(void);
void I2CStop(void);
void I2CSendByte(unsigned char byt);
unsigned char I2CReceiveByte(void);
unsigned char I2CWaitAck(void);
void I2CSendAck(unsigned char ackbit);
unsigned int Read_PCF8591();
void Write_AT24C02_Page(unsigned char *buf,unsigned char num);
void Read_AT24C02_Page(unsigned char *buf,unsigned char num);

#endif

onewire.c

/*	# 	单总线代码片段说明
	1. 	本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
	2. 	参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题
		中对单片机时钟频率的要求，进行代码调试和修改。
*/

//
#include <STC15F2K60S2.H>
#include "onewire.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;
}

unsigned int Read_Temp()
{
	unsigned int temp;
	unsigned char LSB,MSB;
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	LSB = Read_DS18B20();
	MSB = Read_DS18B20();
	temp = MSB << 8 | LSB;
	return temp * 6.25;
}

onewire.h

#ifndef __onewire_h
#define	__onewire_h

void Delay_OneWire(unsigned int t);
void Write_DS18B20(unsigned char dat);
unsigned char Read_DS18B20(void);
bit init_ds18b20(void);
unsigned int Read_Temp();


#endif

sys.c

#include <STC15F2K60S2.H>
#include "sys.h"

void Delay_ms(unsigned int t)		//@12.000MHz
{
	while(t--)
	{
		unsigned char i, j;
		i = 12;
		j = 169;
		do
		{
			while (--j);
		} while (--i);
	}
}

void Select_Hc573(char 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;
	}
  P2 = P2 & 0x1f;
}

void Sys_Init()
{
	P0 = 0x00;
	Select_Hc573(5);
	P0 = 0xff;
	Select_Hc573(4);
}

void Select_Bit(unsigned char pos,dat)
{
	P0 = 0x01 << pos;
	Select_Hc573(6);
	P0 = dat;
	Select_Hc573(7);
	Delay_ms(1);
	P0 = 0xff;
	Select_Hc573(7);
}

sys.h

#ifndef __sys_h
#define __sys_h

void Delay_ms(unsigned int t);
void Select_Hc573(char n);
void Sys_Init();
void Select_Bit(unsigned char pos,dat);

#endif

main.c

#include <STC15F2K60S2.H>
#include "iic.h"
#include "onewire.h"
#include "sys.h"

sbit S7 = P3^0;
sbit S6 = P3^1;
sbit S5 = P3^2;
sbit S4 = P3^3;

code unsigned char SMG[] = { ~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,~0x7D,~0x07,~0x7F,~0x6F};
unsigned char Echo[10];
unsigned char Echo_temp[10];

unsigned int Temp;//温度	0-9999
unsigned int V;//电压	0-50
unsigned int Fre;//频率	0-65535

char V_yuzhi = 10;//电压阈值
char old_yuzhi = 10;

unsigned char Mode;//大界面切换	0-数据界面	1-回显界面	2-电压阈值设置界面
unsigned char Dat_Mode;//数据界面切换	0-温度	1-电压	2-频率
unsigned char Echo_Mode;//回显界面切换	0-温度	1-电压	2-频率
unsigned char count1,count2,count3,count4;

bit flag_10ms,flag_800ms,ok,flag,flag_200ms;


void Timer1Init(void)		//10毫秒@12.000MHz
{
	AUXR &= 0xBF;		//定时器时钟12T模式
	TMOD = 0x05;		//设置定时器模式
	TL1 = 0xF0;		//设置定时初值
	TH1 = 0xD8;		//设置定时初值
	TH0 = TL0 = 0;
	TF1 = 0;		//清除TF1标志
	TR0 = TR1 = 1;		//定时器1开始计时
	ET0 = ET1 = 1;
	EA = 1;
}
void Timer1_isr() interrupt 3
{
	flag_10ms = 1;
	if(++count1 > 100)
	{
		count1 = 0;
		Fre = TH0 << 8 | TL0;
		TH0 = TL0 = 0;
	}
	if(++count2 > 50)
	{
		count2 = 0;
		if(flag_800ms)
		{
//			flag = 1;
			if(++V_yuzhi > 50)	V_yuzhi = 50;
		}
	}
	if(++count3 > 50)//每隔半秒进来查看
	{
		count3 = 0;
		if(Mode == 2)//界面2下
		{
			if(old_yuzhi != V_yuzhi)//半秒内不等于的话就刷新一次old_yuzhi，且不能返回数据界面
			{
				old_yuzhi = V_yuzhi;//刷新一次
				ok = 0;//	0-不能进入数据界面
			}
			else
			{
				ok = 1;//	1-能进入数据界面
			}
		}
	}
	if(++count4 > 20)
	{
		count4 = 0;
		if(V > V_yuzhi)
			flag_200ms = ~flag_200ms;
	}
}
	
void Display_V()//电压测量显示界面
{
	Select_Bit(0,~0x3e);
	Select_Bit(6,SMG[V / 10] - 0x80);
	Select_Bit(7,SMG[V % 10]);
}

void Display_Fre()//频率界面
{
	Select_Bit(0,~0x71);
	if(Fre > 9999)	Select_Bit(3,SMG[Fre / 10000]);
	if(Fre > 999)	Select_Bit(4,SMG[Fre / 1000 % 10]);
	if(Fre > 99)	Select_Bit(5,SMG[Fre / 100 % 10]);
	if(Fre > 9)	Select_Bit(6,SMG[Fre / 10 % 10]);
	Select_Bit(7,SMG[Fre % 10]);
}

void Display_Temp()//温度界面
{
	Select_Bit(0,~0x39);
	Select_Bit(4,SMG[Temp / 1000]);
	Select_Bit(5,SMG[Temp / 100 % 10] - 0x80);
	Select_Bit(6,SMG[Temp / 10 % 10]);
	Select_Bit(7,SMG[Temp % 10]);
}

void Display_Echo()//数据回显界面
{
	unsigned int Temp_temp = Echo[0] * 100 + Echo[1];
	unsigned int V_temp = Echo[2];
	unsigned int Fre_temp = Echo[3] * 10000 + Echo[4] * 100 + Echo[5];
	Select_Bit(0,~0x76);
	switch(Echo_Mode)
	{
		case 0://温度
			Select_Bit(1,~0x39);
			Select_Bit(4,SMG[Temp_temp / 1000]);
			Select_Bit(5,SMG[Temp_temp / 100 % 10] - 0x80);
			Select_Bit(6,SMG[Temp_temp / 10 % 10]);
			Select_Bit(7,SMG[Temp_temp % 10]);
		break;
		case 1://电压
			Select_Bit(1,~0x3e);
			Select_Bit(6,SMG[V_temp / 10] - 0x80);
			Select_Bit(7,SMG[V_temp % 10]);
		break;
		case 2://频率
			Select_Bit(1,~0x71);
			if(Fre_temp > 9999)	Select_Bit(3,SMG[Fre_temp / 10000]);
			if(Fre_temp > 999)	Select_Bit(4,SMG[Fre_temp / 1000 % 10]);
			if(Fre_temp > 99)	Select_Bit(5,SMG[Fre_temp / 100 % 10]);
			if(Fre_temp > 9)	Select_Bit(6,SMG[Fre_temp / 10 % 10]);
			Select_Bit(7,SMG[Fre_temp % 10]);
		break;
	}
}

void Display_V_yuzhi()//电压阈值设置界面
{
	Select_Bit(0,~0x73);
	Select_Bit(6,SMG[V_yuzhi / 10] - 0x80);
	Select_Bit(7,SMG[V_yuzhi % 10]);
}

void Key_Scan()
{
	static unsigned char cnt4 = 0;
	static unsigned char cnt5 = 0;
	static unsigned char cnt6 = 0;
	static unsigned int cnt7 = 0;
	if(flag_10ms)
	{
		if(S7 == 0)	cnt7++;
		if(S7 == 1)
		{
			if(cnt7 > 2)
			{
				Mode = 2;
				if(ok)	
				{	
					Mode = 0;
					ok = 0;
				}
			}
			cnt7 = 0;
		}
		if(S6 == 0)	
		{
			cnt6++;
			if(cnt6 > 80)	flag_800ms = 1;
		}
		if(S6 == 1)
		{			
			flag_800ms = 0;
			if(cnt6 > 2)
			{
				if(Mode == 2)
				{
					if(++V_yuzhi > 50)	
					{
						V_yuzhi = 50;
					}
				}
				else
				{
					Mode = 1;
					Read_AT24C02_Page(Echo,6);
				}
			}
			cnt6 = 0;
		}
		if(S5 == 0)	cnt5++;
		if(S5 == 1)
		{
			if(cnt5 > 2)
			{
				Echo_temp[0] = Temp / 100;Echo_temp[1] = Temp % 100;
				Echo_temp[2] = V;
				Echo_temp[3] = Fre / 10000;Echo_temp[4] = Fre / 100 % 100;Echo_temp[5] = Fre % 100;
				Write_AT24C02_Page(Echo_temp,6);
			}
			cnt5 = 0;
		}
		if(S4 == 0)	cnt4++;
		if(S4 == 1)
		{
			if(cnt4 > 2)
			{
				if(!Mode)
				{
					if(++Dat_Mode > 2)	Dat_Mode = 0;
				}
				else if(Mode == 1)
				{
					if(++Echo_Mode > 2)	Echo_Mode = 0;
				}
			}
			cnt4 = 0;
		}
		flag_10ms = 0;
	}
}

void Led(unsigned char addr,enable)
{
	static unsigned char temp = 0x00;
	static unsigned char temp_old = 0xff;
	if(enable)	temp |= 0x01 << addr;
	else	temp &= ~(0x01 << addr);
	if(temp != temp_old)
	{
		P0 = ~temp;
		Select_Hc573(4);
		temp_old = temp;
	}
}

void Led_Pro()
{
	if(Mode == 0 && Dat_Mode == 0)	Led(0,1);
	else Led(0,0);
	if(Mode == 0 && Dat_Mode == 2)	Led(1,1);
	else Led(1,0);
	if(Mode == 0 && Dat_Mode == 1)	Led(2,1);
	else Led(2,0);
	if(flag_200ms)	Led(7,1);
	else	Led(7,0);
}

void main()
{
	Sys_Init();
	Timer1Init();
	Read_Temp();
	Delay_ms(750);
	Read_AT24C02_Page(Echo,6);
	while(1)
	{
		V = Read_PCF8591() / 51.0 * 10;
		Temp = Read_Temp();
		Key_Scan();
		switch(Mode)
		{
			case 0:
				switch(Dat_Mode)
				{
					case 0:Display_Temp();break;
					case 1:Display_V();break;
					case 2:Display_Fre();break;
				}
			break;
			case 1:Display_Echo();break;
			case 2:Display_V_yuzhi();break;
		}	
		Led_Pro();		
	}
}