[嵌入式] 蓝桥杯单片机比赛准备程序

开发: C++知识库 Java知识库 JavaScript Python PHP知识库人工智能区块链大数据移动开发嵌入式开发工具数据结构与算法开发测试游戏开发网络协议系统运维
教程: HTML教程 CSS教程 JavaScript教程 Go语言教程 JQuery教程 VUE教程 VUE3教程 Bootstrap教程 SQL数据库教程 C语言教程 C++教程 Java教程 Python教程 Python3教程 C#教程
数码: 电脑笔记本显卡显示器固态硬盘硬盘耳机手机 iphone vivo oppo 小米华为单反装机图拉丁

-> 嵌入式 -> 蓝桥杯单片机比赛准备程序 -> 正文阅读

[嵌入式]蓝桥杯单片机比赛准备程序

74HC595和74HC138控制程序

void Device_ctrl(unsigned char p2date,unsigned char p0date)//p0date为数据p2date为选中模块
{
		P0=p0date;
		P2=P2&0x1f|p2date;
	    P2&=0x1f;
}

系统初始化关闭蜂鸣器LED继电器

Device_ctrl(0x80,0xff)；//关闭蜂鸣器继电器
Device_ctrl(0xa0,0x00);//关闭led

数码管显示函数(需配合定时器使用)

unsigned char smg_du[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};//共阳极数码管段码
unsigned char smg_display[8];
unsigned int  smg_count;
void smg_show()
{
	   unsigned int i;
		Device_ctrl(0xc0,0);
		Device_ctrl(0xe0,~smg_display[i]);
		Device_ctrl(0xc0,0x01<<i);
	    i=(i+1)%8;
}

void smg_process()
{
		if(smg_count>3)
		{
		
		}
}

按键使用函数(需配合定时器使用)?

unsigned char trig_btn;
unsigned char con_btn;
unsigned int key_count;
void key_btn()//三行按键
{
		unsigned char readdate=P3^0xff;
	  trig_btn=readdate&(con_btn^readdate);
	  con_btn=readdate;
}

void key_process()
{
		if(key_count>=10)
		{
			key_count=0;
			key_btn();
			if(trig_btn==0x08)//s4
			{
				
			}
			
			if(trig_btn==0x04)//s5
			{
				
			
			if(trig_btn==0x02)//s6
			{
				
			}
			
			if(trig_btn==0x01)//s7
			{
				
			}
		}
}

矩阵键盘函数(需配合定时器使用)?

#define KEY3 P3
#define NO_KEY 0xff
#define KEY_STATE0 0
#define KEY_STATE1 1
#define KEY_STATE2 2

unsigned int key_count;
unsigned char key_scan()
{
	 static unsigned  char  key_state=KEY_STATE0;
	 unsigned char key_temp,key_value=0;
	 unsigned char key1,key2;
	  
	 P30=0;P31=0;P32=0;P33=0;P34=1;P35=1;P42=1;P44=1;
	 if(P44==0){key1=0x70;}
	 if(P42==0){key1=0xb0;}
	 if(P35==0){key1=0xd0;}
	 if(P34==0){key1=0xe0;}
	 if((P44==1)&&(P42==1)&&(P34==1)&&(P35==1)){key1=0xf0;}
	 
	 P30=1;P31=1;P32=1;P33=1;P34=0;P35=0;P42=0;P44=0;
	 if(P30==0){key2=0x0e;}
	 if(P31==0){key2=0x0d;}
	 if(P32==0){key2=0x0b;}
	 if(P33==0){key2=0x07;}
	 if((P30==1)&&(P31==1)&&(P32==1)&&(P33==1)){key2=0x0f;}
	 
	 key_temp=key1|key2;
	  
	 switch(key_state)
	 {
	    case KEY_STATE0: if(key_temp!=NO_KEY)
		                   {
													key_state=KEY_STATE1;
											 }
											 break;
		 case KEY_STATE1: if(key_temp==NO_KEY)
		                  {
													key_state=KEY_STATE0;
											}
											else
											{
												switch(key_temp)
												{
													case 0x77:key_value=4;break;
													case 0x7b:key_value=5;break;
													case 0x7d:key_value=6;break;
													case 0x7e:key_value=7;break;
													
													case 0xb7:key_value=8;break;
													case 0xbb:key_value=9;break;
													case 0xbd:key_value=10;break;
													case 0xbe:key_value=11;break;
													
													case 0xd7:key_value=12;break;
													case 0xdb:key_value=13;break;
													case 0xdd:key_value=14;break;
													case 0xde:key_value=15;break;
													
													case 0xe7:key_value=16;break;
													case 0xeb:key_value=17;break;
													case 0xed:key_value=18;break;
													case 0xee:key_value=19;break;
												}
												key_state=KEY_STATE2;
											}
											break;
			case KEY_STATE2:if(key_temp==NO_KEY)
			                {
												key_state=KEY_STATE0;
											}
											break;
			 }
			return key_value;
}

void key_process()
{
	  unsigned char key_val;
		if(key_count>10)
		{
			key_count=0;
			key_val=key_scan();
			
			switch(key_val)
			{
				case 4:break;
				case 5:break;
				case 6:break;
				case 7:break;
				case 8:break;
				case 9:break;
				case 10:break;
				case 11:break;
				case 12:break;
				case 13: break;
				case 14: break;
				case 15: break;
				case 16: break;
				case 17: break;
				case 18 : break;
				case 19: break;
				
				
			}
		}
}

温度读取函数(需配合定时器使用)?

//通过在while 1 之前运行一次准备读取温度避免刚上电温度读取85问题
unsigned int temp;
void temper_start()//准备读取温度
{
		init_ds18b20();
	  Write_DS18B20(0xcc);
	  Write_DS18B20(0x44);
}
float  read_temper()//读取温度
{
		float temper;
	  unsigned char low,high;
	  init_ds18b20();
	  Write_DS18B20(0xcc);
	  Write_DS18B20(0xbe);
	  
	  
	  low=Read_DS18B20();
		high=Read_DS18B20();
	  temper=(high<<8)|low;
	  temper=temper*0.0625; 
		return temper;
}
unsigned int temp_count;

void temp_process()//每一秒读取一次温度 在定时器中设置温度读取间隔时间
{
		if(temp_count>1000)
		{
			  temp=read_temper()*100;
			  temper_start();
			  temp_count=0;
		}
}

温度读取的底层驱动代码

onewire.c

#include "reg52.h"

sbit DQ = P1^4;  //单总线接口

//单总线延时函数
void Delay_OneWire(unsigned int t)  //STC89C52RC
{
	t*=12;
	while(t--);	
}

//通过单总线向DS18B20写一个字节
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);
}

//从DS18B20读取一个字节
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;
}

//DS18B20设备初始化
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;
}

?温度读取头文件

?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);

#endif

AD函数(需配合定时器使用)?

unsigned int ad_count;
unsigned char ad_val;

unsigned char read_ad(unsigned char add)//读取ad数值0-255
{
		unsigned char ad_value;
	  
	   IIC_Start();
	   IIC_SendByte(0x90);
	   IIC_WaitAck();
	   IIC_SendByte(add);
	   IIC_WaitAck();
	  
	   IIC_Start();
	   IIC_SendByte(0x91);
	   IIC_WaitAck();
	   ad_value=IIC_RecByte();
	   IIC_SendAck(1);
		 IIC_Stop();
	
		return ad_value;
}

void ad_process()//通过定时器来读取ad数值
{
		if(ad_count>100)
		{
		 ad_count=0;
		 ad_val=read_ad(0x03);//0x03为电位器rb2 0x01为光敏电阻
		}
}

DA函数(需配合定时器使用)?

unsigned int da_count;//定时器控制电压输出频率
unsigned int ad_val;//255对应5v
void da(unsigned char date)//电压输出函数
{
		IIC_Start();
		IIC_SendByte(0x90);
	  IIC_WaitAck();
		IIC_SendByte(0X40);
	  IIC_WaitAck();
	  IIC_SendByte(date);
	  IIC_WaitAck();
	  IIC_Stop();
}

void da_process()
{
		if(da_count>100)
		{
		 da_count=0;
		 ad_val=255;
		 da(ad_val);
		}
}

eeprom函数

写入函数

void write_eeprom(unsigned char add,unsigned char date)//eeprom写入函数
{
		IIC_Start();
    IIC_SendByte(0xa0); 
		IIC_WaitAck();
	  IIC_SendByte(add); 
		IIC_WaitAck();
	  IIC_SendByte(date); 
		IIC_WaitAck();
	  IIC_Stop();
}

eeprom读取函数

unsigned char read_eeprom(unsigned char add)//eeprom写入函数
{
	  unsigned char date;
		IIC_Start();
    IIC_SendByte(0xa0); 
		IIC_WaitAck();
	  IIC_SendByte(add); 
		IIC_WaitAck();
	  
	  IIC_Start();
    IIC_SendByte(0xa1); 
	  IIC_WaitAck();
    date=IIC_RecByte();	
		IIC_SendAck(1);
	  IIC_Stop();
	
	  return date;
}

IIC底层驱动函数

iic.c? ? ? ? ? ? ? ? ? ? ? ? ?

#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;  /* 数据线 */
sbit SCL = P2^0;  /* 时钟线 */

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;    
}

?iic.h0

#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 IIC_Delay(unsigned char i);
#endif

DS1302写入时分秒? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

void set_sfm(unsigned char shi,unsigned char fen,unsigned char miao)
{
		Write_Ds1302_Byte(0x8e,0);
		Write_Ds1302_Byte(0x80,(miao/10)*16+miao%10);
		Write_Ds1302_Byte(0x82,(fen/10)*16+fen%10);
		Write_Ds1302_Byte(0x84,(shi/10)*16+shi%10);
		Write_Ds1302_Byte(0x8e,0x80);
}

?时分秒读取

shi=shi/16*10+shi%16;
fen=fen/16*10+fen%16;
miao=miao/16*10+miao%16;

DS1302底层驱动代码

ds1302.c

#include <reg52.h>
#include <intrins.h>

sbit SCK=P1^7;		
sbit SDA=P2^3;		
sbit RST = P1^3;   // DS1302复位												

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);			
}

?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 );


#endif