LCD1602温度检测显示程序(ATmega16)
单片机源程序如下:
- //**********************************************************************//
- //************************* 头文件定义 **********************//
- //**********************************************************************//
- #include<iom16v.h>
- #include <macros.h>
- //宏定义
- #define uchar unsigned char
- #define uint unsigned int
- //温度18b20(数据线端口)
- #define tmp (PINB&BIT(PB3))
- #define temp_h PORTB |= BIT(PB3)
- #define temp_l PORTB &=~BIT(PB3)
- #define temp_o DDRB |= BIT(PB3)
- #define temp_i DDRB &=~BIT(PB3)
- //LCD1602液晶显示(数据线端口)
- #define rs_h PORTB |= BIT(PB0)//数据/命令选择
- #define rs_l PORTB &=~BIT(PB0)
- #define rw_h PORTB |= BIT(PB1)//读/写选择
- #define rw_l PORTB &=~BIT(PB1)
- #define en_h PORTB |= BIT(PB2)//使能信号
- #define en_l PORTB &=~BIT(PB2)
- //温度18b20(变量定义)
- unsigned char dat1=0x00;//保存读出的温度 L
- unsigned char dat2=0x00;//保存读出的温度 H
- unsigned long int dat=0;//保存读出的温度 XS
- unsigned char flag=0;//错误标志位
- //按键定义
- unsigned char key1=0;
- unsigned char key2=0;
- //unsigned char key3=0;
- //unsigned char key4=0;
- //返回值变量
- unsigned char keyvalue=0;
- //温度H
- unsigned char tempH=30;
- //温度L
- unsigned char tempL=20;
- //**********************************************************************//
- //************************* IO 端口定义 **********************//
- //**********************************************************************//
- void IO_init(void)
- {
- DDRA = 0XFF;
- DDRB = 0XF0;
- DDRC = 0XFF;
- DDRD = 0XFF;
- PORTA = 0X00;
- PORTB = 0X00;
- PORTC = 0XFF;
- PORTD = 0XFF;
- }
- //**********************************************************************//
- //************************* 延时函数 **********************//
- //**********************************************************************//
- void delayms(uint z) //8M晶振下,延时1ms
- {
- uint x,y;
- for(x=z;x>0;x--)
- for(y=1333;y>0;y--);
- }
- //**********************************************************************//
- //*************************** 18B20 ************************//
- //**********************************************************************//
- void Ds18b20_reset(void)//DS18B20初始化
- {
- uint count;
- temp_o;
- temp_l;
- for(count=700;count>0;count--);//延时480us
- temp_h;
- temp_i;//不须配置PORT内部上拉电阻,MCU输入输出自动切换
- while((tmp==0x08));//&&(i>0)) i--;
- for(count=700;count>0;count--);//延时480us
- }
- void Ds18b20_write(uchar dat)//向DS18B20写一个字节
- {
- uchar count;
- uchar i;
- temp_o;
- for(i=8;i>0;i--)
- {
- temp_l;
- for(count=2;count>0;count--);
- //temp_h;//不能有此语句
- if(dat&0x01==0x01)
- temp_h;
- else
- temp_l;
- for(count=120;count>0;count--);//延时60us
- temp_h;
- dat>>=1;
- }
- }
- uchar Ds18b20_read(void)//从DS18B20读一个字节
- {
- uchar i,datt;
- uchar count;
- for(i=8;i>0;i--)
- {
- datt>>=1;
- temp_o;
- temp_l;
- for(count=2;count>0;count--);
- temp_h;//此语句必须有,参考datasheet的P15
- for(count=1;count>0;count--);
- temp_i;
- if(tmp==0x08)
- datt|=0x80;
- for(count=120;count>0;count--); //延时60us
- }
- return datt;
- }
- void temp_Read(void)//温度读取
- {
- Ds18b20_reset();//DS18B20初始化
- Ds18b20_write(0xcc);//跳过ROM
- Ds18b20_write(0x44);//发送温度转换命令
- delayms(1000);//延时1s,等待温度转换完成
- Ds18b20_reset();//DS18B20初始化
- Ds18b20_write(0xcc);//跳过ROM
- Ds18b20_write(0xbe);//发送读温度寄存器命令
- dat1=Ds18b20_read();//读温度值的低字节
- dat2=Ds18b20_read();//读温度值的高字节
- }
- void temp_display(void)//温度显示
- {
- if(dat2>=240)//dat2温度值的高字节为1时为负温度
- {
- dat=(~(dat2*256+dat1)+1)*0.625;//负温度:取反加一,保留一位小数
- flag=1;
- }
- else
- {
- dat=(dat2*256+dat1)*0.625;
- flag=0;
- }
- if(flag==1)//负温度显示
- {
- LCD_write_str(0,0," 18B20 ");
- LCD_write_str(3,1,"Temp:");
- LCD_write_str(8,1,"-");// 符号“- ”
- LCD_write_char(9,1,0x30+dat/1000);
- LCD_write_char(10,1,0x30+dat%1000/100);
- LCD_write_char(11,1,0x30+dat%100/10);
- LCD_write_str (12,1,".");// 符号“. ”
- LCD_write_char(13,1,0x30+dat%10);
- }
- if(flag==0)//正温度显示
- {
- LCD_write_str(0,0," 18B20 ");
- LCD_write_str(3,1,"Temp:");
- LCD_write_str(8,1," ");// 符号“+ ”
- LCD_write_char(9,1,0x30+dat/1000);
- LCD_write_char(10,1,0x30+dat%1000/100);
- LCD_write_char(11,1,0x30+dat%100/10);
- LCD_write_str (12,1,".");// 符号“. ”
- LCD_write_char(13,1,0x30+dat%10);
- }
- }
- void tempH_Setting(void)//最高温度设置显示
- {
- LCD_write_str(0,0," temp(H)Setting ");
- LCD_write_char(6,1,0x30+tempH%1000/100);
- LCD_write_char(7,1,0x30+tempH%100/10);
- LCD_write_char(8,1,0x30+tempH%10);
- }
- void tempL_Setting(void)//最低温度设置显示
- {
- LCD_write_str(0,0," temp(L)Setting ");
- LCD_write_char(6,1,0x30+tempL%1000/100);
- LCD_write_char(7,1,0x30+tempL%100/10);
- LCD_write_char(8,1,0x30+tempL%10);
- }
- void temp_police(void)//温度报警
- {
- if(dat/10>=tempH)//最高检测温度>=设定温度:灯亮
- {
- PORTC&=~BIT(7);
- }
- else
- {
- PORTC|= BIT(7);
- }
- if(dat/10<=tempL)//最低检测温度<=设定温度:灯亮
- {
- PORTC&=~BIT(6);
- }
- else
- {
- PORTC|= BIT(6);
- }
- }
- //**********************************************************************//
- //*************************** LCD1602 ************************//
- //**********************************************************************//
- void LCD_init(void)//LCD显示屏初始化函数
- {
- DDRA = 0xFF; //I/O口方向设置
- DDRB|=BIT(PB0)|BIT(PB1)|BIT(PB2);
- delayms(15); //上电延时一段时间,使供电稳定
- Write_Instruction(0x38); //8bit interface,2line,5*7dots
- delayms(5);
- Write_Instruction(0x38);
- delayms(5);
- Write_Instruction(0x38);
- Write_Instruction(0x08); //关显示,不显光标,光标不闪烁
- Write_Instruction(0x01); //清屏
- delayms(5);
- Write_Instruction(0x04); //写一字符,整屏显示不移动
- //Write_Instruction(0x05); //写一字符,整屏右移
- //Write_Instruction(0x06); //写一字符,整屏显示不移动
- //Write_Instruction(0x07); //写一字符,整屏左移
- delayms(5);
- //Write_Instruction(0x0B); //关闭显示(不显示字符,只有背光亮)
- Write_Instruction(0x0C); //开显示,光标、闪烁都关闭
- //Write_Instruction(0x0D); //开显示,不显示光标,但光标闪烁
- //Write_Instruction(0x0E); //开显示,显示光标,但光标不闪烁
- //Write_Instruction(0x0F); //开显示,光标、闪烁均显示
- }
- void lcd_en(void) //en端产生一个高电平脉冲,控制LCD写时序
- {
- delayms(1);
- en_h;
- delayms(1);
- en_l;
- }
- void LCD_clear(void)//清屏函数
- {
- Write_Instruction(0x01);
- delayms(5);
- }
- void Write_Instruction(uchar com)//向LCD1602写命令
- {
- rs_l;
- rw_l;
- en_h;
- PORTA=com;
- lcd_en();//写入命令
- }
- void lcd_dat(uchar dat)//向LCD1602写数据
- {
- rs_h;
- rw_l;
- en_h;
- PORTA=dat;
- lcd_en();//写入数据
- }
- void LCD_SET_XY(uchar X,uchar Y)//字符显示初始地址设置
- {
- uchar address;
- if(Y==0)
- address=0x80+X;//Y=0,表示在第一行显示,地址基数为0x80
- else
- address=0xc0+X;//Y非0时,表时在第二行显示,地址基数为0XC0
- Write_Instruction(address);//写指令,设置显示初始地址
- }
- void LCD_write_str(uchar X,uchar Y,uchar *s)//在第X行Y列开始显示,指针*S所指向的字符串
- {
- LCD_SET_XY(X,Y);//设置初始字符显示地址
- while(*s)//逐次写入显示字符,直到最后一个字符"/0"
- {
- lcd_dat(*s);//写入当前字符并显示
- s++;//地址指针加1,指向下一个待写字符
- }
- }
- void LCD_write_char(uchar X,uchar Y,uchar Wdata)//在第X行Y列开始显示Wdata所对应的单个字符
- {
- LCD_SET_XY(X,Y);//写地址
- lcd_dat(Wdata);//写入当前字符并显示
- }
- void LCD_Start(void)//LCD启动界面
- {
- LCD_write_str(0,0," 18B20 ");
- LCD_write_str(0,1," temp display ");
- }
- //**********************************************************************//
- //*************************** 按键扫描 ************************//
- //**********************************************************************//
- uchar keys(void)
- {
- if(!(PIND&BIT(0)))//温度显示
- {
- delayms(20);
- if(!(PIND&BIT(0)))
- {
- LCD_clear();//LCD清屏
- keyvalue=0;
- while(!(PIND&BIT(0)));//等待按键抬起
- }
- }
- if(!(PIND&BIT(1)))//最高、最低温度设置选择
- {
- delayms(20);
- if(!(PIND&BIT(1)))
- {
- LCD_clear();//LCD清屏
- key1=key1+1;
- switch(key1)
- {
- case 1:
- tempH_Setting();//最高温度设置显示
- keyvalue=1;//按键最高温度返回值:1
- break;
- case 2:
- tempL_Setting();//最低温度设置显示
- keyvalue=2;//按键最低温度返回值:2
- key1=0;//按键清零
- break;
- }
- while(!(PIND&BIT(1)));//等待按键抬起
- }
- }
- if(!(PIND&BIT(2)))//温度加
- {
- delayms(20);
- if(!(PIND&BIT(2)))
- {
- if(keyvalue==1)
- {
- tempH++;
- if(tempH>=100)
- {
- tempH=100;
- }
- tempH_Setting();//最高温度设置显示
- }
- else if(keyvalue==2)
- {
- tempL++;
- if(tempL>=100)
- {
- tempL=100;
- }
- tempL_Setting();//最低温度设置显示
- }
- //while(!(PIND&BIT(2)));//等待按键抬起
- }
- }
- if(!(PIND&BIT(3)))//温度减
- {
- delayms(20);
- if(!(PIND&BIT(3)))
- {
- if(keyvalue==1)
- {
- tempH--;
- if(tempH<=10)
- {
- tempH=10;
- }
- tempH_Setting();//最高温度设置显示
- }
- else if(keyvalue==2)
- {
- tempL--;
- if(tempL<=10)
- {
- tempL=10;
- }
- tempL_Setting();//最低温度设置显示
- }
- //while(!(PIND&BIT(3)));//等待按键抬起
- }
- }
- }
- //**********************************************************************//
- //*************************** 主函数 ************************//
- //**********************************************************************//
- void main(void)
- {
- uchar key_j;
- IO_init(); //端口初始化
- LCD_init(); //LCD初始化
- LCD_clear();//LCD清屏
- //LCD_Start();//LCD启动界面
- while(1)
- {
- keys();
- if(keyvalue==0)
- {
- temp_Read();//温度读取
- temp_display();//温度显示
- temp_police();//温度报警
- }
- }
- }
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