蓝桥杯单片机第七届国赛真题＋代码

原创已于 2023-07-28 15:26:03 修改

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#蓝桥杯 #单片机 #职场和发展

于 2023-07-28 14:40:37 首次发布

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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

ds1302.c

/*	# 	DS1302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 "ds1302.h"
#include "intrins.h"

sbit SCK = P1^7;
sbit SDA = P2^3;
sbit RST = P1^3;

code unsigned char Write_addr[] = {0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};
code unsigned char Read_addr[] = {0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};
unsigned char time[] = {0x55,0x59,0x23};

void Write_Ds1302(unsigned  char temp) 
{
	unsigned char i;
	for (i=0;i<8;i++)     	
	{ 
		SCK = 0;
		SDA = temp&0x01;
		temp>>=1; 
		SCK=1;
	}
}   

//
void Write_Ds1302_Byte( unsigned char address,unsigned char dat )     
{
 	RST=0;	_nop_();
 	SCK=0;	_nop_();
 	RST=1; 	_nop_();  
 	Write_Ds1302(address);	
 	Write_Ds1302(dat);		
 	RST=0; 
}

//
unsigned char Read_Ds1302_Byte ( unsigned char address )
{
 	unsigned char i,temp=0x00;
 	RST=0;	_nop_();
 	SCK=0;	_nop_();
 	RST=1;	_nop_();
 	Write_Ds1302(address);
 	for (i=0;i<8;i++) 	
 	{		
		SCK=0;
		temp>>=1;	
 		if(SDA)
 		temp|=0x80;	
 		SCK=1;
	} 
 	RST=0;	_nop_();
 	SCK=0;	_nop_();
	SCK=1;	_nop_();
	SDA=0;	_nop_();
	SDA=1;	_nop_();
	return (temp);			
}

void Write_time()
{
	char i;
	Write_Ds1302_Byte(0x8e,0x00);
	for(i = 0;i < 3;i++)
		Write_Ds1302_Byte(Write_addr[i],time[i]);
	Write_Ds1302_Byte(0x8e,0x80);
}

void Write_new_time(unsigned char index,dat)
{
	Write_Ds1302_Byte(0x8e,0x00);
	Write_Ds1302_Byte(Write_addr[index],dat);
	Write_Ds1302_Byte(0x8e,0x80);
}

void Read_time()
{
	char i;
	for(i = 0;i < 3;i++)
		time[i] = Read_Ds1302_Byte(Read_addr[i]);
}

ds1302.h

#ifndef __ds1302_h
#define __ds1302_h

void Write_Ds1302(unsigned  char temp);
void Write_Ds1302_Byte( unsigned char address,unsigned char dat );
unsigned char Read_Ds1302_Byte ( unsigned char address );
void Write_time();
void Read_time();
void Write_new_time(unsigned char index,dat);

#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 "ds1302.h"
#include "sys.h"

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;

code unsigned char SMG[] = {~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,~0x7D,~0x07,~0x7F,~0x6F,~0x40};

extern unsigned char time[];
unsigned char count1,count2,count3,count4,count5,count6;
unsigned int fre;//频率
unsigned int v;//电压
int v_up = 2000,v_down = 1000;//电压上下限
unsigned int fre_zhouqi;//频率周期

bit flag_10ms;
unsigned char key_val;
bit mode_fre;//0-频率	1-周期
bit type;//事件类型
unsigned char time_happen[3];
unsigned char mode;
bit shi,fen,miao;
unsigned char mode_time;//0-时钟界面	1-设置小时	2-分钟	3-秒
unsigned char mode_v;//0-电压界面	1-上限	2-下限
bit up,down;
unsigned char save[8];
unsigned char rec[8];
char i;
bit mode_thing;//0-类型	1-时间

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
{
	if(++count1 > 100)
	{
		count1 = 0;
		fre = TH0 << 8 | TL0;
		TH0 = TL0 = 0;
	}
	flag_10ms = 1;
	switch(mode_time)
	{
		case 0:shi = fen = miao = 0;break;
		case 1:
			if(++count2 > 100)
			{
				count2 = 0;
				shi = ~shi;fen = miao = 0;
			}
		break;
		case 2:
			if(++count3 > 100)
			{
				count3 = 0;
				fen = ~fen;shi = miao = 0;
			}
		break;
		case 3:
			if(++count4 > 100)
			{
				count4 = 0;
				miao = ~miao;fen = shi = 0;
			}
		break;
	}
	switch(mode_v)
	{
		case 0:up = down = 0;break;
		case 1:
			if(++count5 > 100)
			{
				count5 = 0;
				up = ~up;down = 0;
			}
		break;
		case 2:
			if(++count6 > 100)
			{
				count6 = 0;
				down = ~down;up = 0;
			}
		break;
	}
}

void Display_time()//时间界面
{
	Select_Bit(0,SMG[time[2] / 16]);
	Select_Bit(1,SMG[time[2] % 16]);
	Select_Bit(2,SMG[10]);
	Select_Bit(3,SMG[time[1] / 16]);
	Select_Bit(4,SMG[time[1] % 16]);
	Select_Bit(5,SMG[10]);
	Select_Bit(6,SMG[time[0] / 16]);
	Select_Bit(7,SMG[time[0] % 16]);
}

void Display_time_set()//时间设置界面
{
	if(!shi)
	{
		Select_Bit(0,SMG[time[2] / 16]);
		Select_Bit(1,SMG[time[2] % 16]);
	}
	else
	{
		Select_Bit(0,0xff);
		Select_Bit(1,0xff);
	}
	Select_Bit(2,SMG[10]);
	if(!fen)
	{
		Select_Bit(3,SMG[time[1] / 16]);
		Select_Bit(4,SMG[time[1] % 16]);
	}
	else
	{
		Select_Bit(3,0xff);
		Select_Bit(4,0xff);
	}
	Select_Bit(5,SMG[10]);
	if(!miao)
	{
		Select_Bit(6,SMG[time[0] / 16]);
		Select_Bit(7,SMG[time[0] % 16]);
	}
	else
	{
		Select_Bit(6,0xff);
		Select_Bit(7,0xff);
	}
}

void Display_v()//电压测量
{
	Select_Bit(0,SMG[10]);
	Select_Bit(1,SMG[1]);
	Select_Bit(2,SMG[10]);
	Select_Bit(4,SMG[v / 1000]);
	Select_Bit(5,SMG[v / 100 % 10]);
	Select_Bit(6,SMG[v / 10 % 10]);
	Select_Bit(7,SMG[v % 10]);
}

void Display_v_set()//电压阈值设置
{
	if(!up)
	{
		Select_Bit(0,SMG[v_up / 1000]);
		Select_Bit(1,SMG[v_up / 100 % 10]);
		Select_Bit(2,SMG[v_up / 10 % 10]);
		Select_Bit(3,SMG[v_up % 10]);
	}
	else
	{
		Select_Bit(0,0xff);
		Select_Bit(1,0xff);
		Select_Bit(2,0xff);
		Select_Bit(3,0xff);
	}
	if(!down)
	{
		Select_Bit(4,SMG[v_down / 1000]);
		Select_Bit(5,SMG[v_down / 100 % 10]);
		Select_Bit(6,SMG[v_down / 10 % 10]);
		Select_Bit(7,SMG[v_down % 10]);
	}
	else
	{
		Select_Bit(4,0xff);
		Select_Bit(5,0xff);
		Select_Bit(6,0xff);
		Select_Bit(7,0xff);
	}
}

void Display_fre()//频率界面
{
	Select_Bit(0,SMG[10]);
	Select_Bit(1,SMG[2]);
	Select_Bit(2,SMG[10]);
	if(!mode_fre)
	{
		Select_Bit(3,SMG[fre / 10000]);
		Select_Bit(4,SMG[fre / 1000 % 10]);
		Select_Bit(5,SMG[fre / 100 % 10]);
		Select_Bit(6,SMG[fre / 10 % 10]);
		Select_Bit(7,SMG[fre % 10]);
	}
	else
	{
		Select_Bit(3,SMG[fre_zhouqi / 10000]);
		Select_Bit(4,SMG[fre_zhouqi / 1000 % 10]);
		Select_Bit(5,SMG[fre_zhouqi / 100 % 10]);
		Select_Bit(6,SMG[fre_zhouqi / 10 % 10]);
		Select_Bit(7,SMG[fre_zhouqi % 10]);
	}
}

void Display_type()//事件类型界面
{
	Select_Bit(6,SMG[0]);
	Select_Bit(7,SMG[type]);
}

void Display_time_happen()//事件时间界面
{
	Select_Bit(0,SMG[time_happen[2] / 16]);
	Select_Bit(1,SMG[time_happen[2] % 16]);
	Select_Bit(2,SMG[10]);
	Select_Bit(3,SMG[time_happen[1] / 16]);
	Select_Bit(4,SMG[time_happen[1] % 16]);
	Select_Bit(5,SMG[10]);
	Select_Bit(6,SMG[time_happen[0] / 16]);
	Select_Bit(7,SMG[time_happen[0] % 16]);
}

unsigned char Key_Scan()
{
	unsigned char key_temp = 0;
	static unsigned char cnt4 = 0;
	static unsigned char cnt5 = 0;
	static unsigned char cnt6 = 0;
	static unsigned char cnt7 = 0;
	static unsigned char cnt8 = 0;
	static unsigned char cnt9 = 0;
	static unsigned char cnt10 = 0;
	static unsigned char cnt11 = 0;
	if(flag_10ms)
	{
		C1 = 0;
		C2 = C3 = C4 = R1 = R2 = R3 = R4 = 1;
		if(R1 == 0)	cnt7++;
		if(R1 == 1)
		{
			if(cnt7 > 2)	key_temp = 7;
			cnt7 = 0;
		}
		
		if(R2 == 0)	cnt6++;
		if(R2 == 1)
		{
			if(cnt6 > 2)	key_temp = 6;
			cnt6 = 0;
		}
		
		if(R3 == 0)	cnt5++;
		if(R3 == 1)
		{
			if(cnt5 > 2)	key_temp = 5;
			cnt5 = 0;
		}
		
		if(R4 == 0)	cnt4++;
		if(R4 == 1)
		{
			if(cnt4 > 2)	key_temp = 4;
			cnt4 = 0;
		}
		
		C2 = 0;
		C1 = C3 = C4 = R1 = R2 = R3 = R4 = 1;
		if(R1 == 0)	cnt11++;
		if(R1 == 1)
		{
			if(cnt11 > 2)	key_temp = 11;
			cnt11 = 0;
		}
		
		if(R2 == 0)	cnt10++;
		if(R2 == 1)
		{
			if(cnt10 > 2)	key_temp = 10;
			cnt10 = 0;
		}
		
		if(R3 == 0)	cnt9++;
		if(R3 == 1)
		{
			if(cnt9 > 2)	key_temp = 9;
			cnt9 = 0;
		}
		
		if(R4 == 0)	cnt8++;
		if(R4 == 1)
		{
			if(cnt8 > 2)	key_temp = 8;
			cnt8 = 0;
		}
		flag_10ms = 0;
	}
	return key_temp;
}

unsigned char shi_bcd(unsigned char shi)
{
	return (shi + (shi / 10) * 6);
}

unsigned char bcd_shi(unsigned char bcd)
{
	return (bcd - (bcd >> 4) * 6);
}

void Key_Pro()
{
	char shi_temp,fen_temp,miao_temp;
	switch(key_val)
	{
		case 4:
			if(mode == 1)
			{
				if(++mode_time > 3)	mode_time = 1;
			}
			if(mode == 2)
			{
				if(++mode_v > 2) mode_v = 1;
			}
			if(mode == 3)
				mode_fre ^= 1;
			if(mode == 4)
				mode_thing ^= 1;
		break;
		case 5:
			mode = 3;
		break;
		case 6:
			mode = 2;
			mode_v = 0;
		break;
		case 7:
			mode = 1;
			mode_time = 0;
		break;
		case 8:
			
		break;
		case 9:
			mode = 4;
		break;
		case 10:
			if(mode == 1)
				switch(mode_time)
				{
					case 1://时
						shi_temp = bcd_shi(time[2]);
						if(--shi_temp < 0)	shi_temp = 23;
						Write_new_time(2,shi_bcd(shi_temp));
					break;
					case 2://分
						fen_temp = bcd_shi(time[1]);
						if(--fen_temp < 0)	fen_temp = 59;
						Write_new_time(1,shi_bcd(fen_temp));
					break;
					case 3://秒
						miao_temp = bcd_shi(time[0]);
						if(--miao_temp < 0)	miao_temp = 59;
						Write_new_time(0,shi_bcd(miao_temp));
					break;
				}
				
			if(mode == 2)
				switch(mode_v)
				{
					case 1://up
						v_up -= 500;
						if(v_up < 0 )	v_up = 9500;
					break;
					case 2://down
						v_down -= 500;
						if(v_down < 0)	v_down = 9500;
					break;
				}
		break;
		case 11:
			if(mode == 1)
				switch(mode_time)
				{
					case 1://时
						shi_temp = bcd_shi(time[2]);
						if(++shi_temp > 23)	shi_temp = 0;
						Write_new_time(2,shi_bcd(shi_temp));
					break;
					case 2://分
						fen_temp = bcd_shi(time[1]);
						if(++fen_temp > 59)	fen_temp = 0;
						Write_new_time(1,shi_bcd(fen_temp));
					break;
					case 3://秒
						miao_temp = bcd_shi(time[0]);
						if(++miao_temp > 59)	miao_temp = 0;
						Write_new_time(0,shi_bcd(miao_temp));
					break;
				}
				
				if(mode == 2)
				switch(mode_v)
				{
					case 1://up
						v_up += 500;
						if(v_up > 9999)	v_up = 0;
					break;
					case 2://down
						v_down += 500;
						if(v_down > 9999)	v_down = 0;
					break;
				}
		break;
	}
	if(mode == 2 && mode_v == 0)
	{
		save[0] = v_up / 100;save[1] = v_up % 100;
		save[2] = v_down / 100;save[3] = v_down % 100;
	}
}

void main()
{
	Sys_Init();
	Timer1Init();
	Write_time();
	Read_AT24C02_Page(rec,8);
	v_up = rec[0] * 100 + rec[1];
	v_down = rec[2] * 100 + rec[3];
	type = rec[4];
	time_happen[2] = rec[5];
	time_happen[1] = rec[6];
	time_happen[0] = rec[7];
	while(1)
	{
		v = Read_PCF8591() / 51.0 * 1000;
		key_val = Key_Scan();
		Key_Pro();
		Read_time();
		fre_zhouqi = (1.0 / fre) * 1000000;
		if(v < v_down || v > v_up)
		{
			if(v < v_down)	type = 0;
			else	type = 1;
			save[4] = type;
			save[5] = time[2];
			save[6] = time[1];	
			save[7] = time[0];
		}
		Write_AT24C02_Page(save,8);
		switch(mode)
		{
			case 1:
				if(!mode_time)	Display_time();
				else Display_time_set();
			break;
			case 2:
				if(!mode_v)	Display_v();
				else	Display_v_set();
			break;
			case 3:Display_fre();break;
			case 4:
				if(!mode_thing)	Display_type();
				else	Display_time_happen();
			break;
		}
	}
}