#include<iom16v.h> #define uchar unsigned char 这个的意思就是预定义 uchar 为 unsigned char 的一个代名词 以后使用uchar就可以代替unsigned char来声明了。 #define uint unsigned int #define rs_h (PORTB|=0x01) // |逐位“或” #define rs_l (PORTB&=0xfe) // & 逐位“与” #define rs_o (DDRB|=0x01) #define rw_h (PORTB|=0x02) #define rw_l (PORTB&=0xfd) #define rw_o (DDRB|=0x02) #define en_h (PORTB|=0x04) #define en_l (PORTB&=0xfb) #define en_o (DDRB|=0x04) #define temp_h (PORTB|=0x08) #define temp_l (PORTB&=0xf7) #define LCD PORTA #define tmp (PINB&0x08) #define temp_o (DDRB|=0x08) #define temp_i (DDRB&=0xf7) uchar dat1,dat2;//保存读出的温度 #define led_o (DDRB|=0x10) #define led_l (PORTB&=0xef) #define led_h (PORTB|=0x10) unsigned long int dat=0; uchar flag=0; void delayms(uint z) //8M晶振下,延时1ms { uintx,y; for(x=z;x>0;x--) for(y=1333;y>0;y--); } void Ds18b20_reset(void)//DS18B20初始化 { uint count; uint i=60000; 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--; led_o; led_l;//开指示灯 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--); } return datt; } void lcd_com(uchar com)//向LCD1602写命令 { rs_o; rw_o; en_o; DDRA=0xff; rs_l; rw_l; LCD=com; delayms(1); en_h; delayms(1); en_l; } void lcd_dat(uchar dat)//向LCD1602写数据 { rs_o; rw_o; DDRA=0xff; en_o; rs_h; rw_l; LCD=dat; delayms(1); en_h; delayms(1); en_l; } void lcd_write(uchar c,uchar r,uchar dat)//向LCD1602指定行、指定列、写数据 { lcd_com(0x80+0x40*c+r); lcd_dat(dat); delayms(1); } void lcd_init(void)//LCD1602初始化,初始化后第一行显示temperature:,第二行显示.C { DDRA=0xff; DDRB|=0x17; lcd_com(0x38); lcd_com(0x0c); lcd_com(0x06); lcd_write(0,2,0x54); //显示T lcd_write(0,3,0x65); //E lcd_write(0,4,0x6d); lcd_write(0,5,0x70); lcd_write(0,6,0x65); lcd_write(0,7,0x72); lcd_write(0,8,0x61); lcd_write(0,9,0x74); lcd_write(0,10,0x75); lcd_write(0,11,0x72); lcd_write(0,12,0x65); lcd_write(0,13,0x3a); lcd_write(1,11,0xdf); lcd_write(1,12,0x43); } void show(void)//把温度值送LCD1602显示 { if(dat2>=240)//遗留问题,温度为25时读出dat1=144,dat2=1正确,但却进入if(dat2&0xf8==0xf8)分支; { dat=(~(dat2*256+dat1)+1)*(0.0625*10);//取反加一,保留一位小数 flag=1; } else //正温度计算 { dat=(dat2*256+dat1)*(0.0625*10); flag=0; }; if(flag==1)//负温度显示 { lcd_write(1,10,0x30+dat%10); lcd_write(1,9,0xa5); lcd_write(1,8,0x30+dat%100/10); lcd_write(1,7,0x30+dat%1000/100); lcd_write(1,6,0x30+dat/1000); lcd_write(1,5,0x2d); } if(flag==0)//正温度显示 { lcd_write(1,10,0x30+dat%10); lcd_write(1,9,0xa5); lcd_write(1,8,0x30+dat%100/10); lcd_write(1,7,0x30+dat%1000/100); lcd_write(1,6,0x30+dat/1000); lcd_write(1,5,0x20);//显示空格,刷掉负号 } } void main(void) { lcd_init(); while(1) { dat1=0x00; dat2=0x00; Ds18b20_reset(); Ds18b20_write(0xcc); 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_write(0xcc); Ds18b20_write(0xbe);//发送读温度寄存器命令 dat1=Ds18b20_read(); dat2=Ds18b20_read(); show(); led_h;//关指示灯 delayms(2000); } } //编译前一定要在工程选项中设置好目标单片机型号; //输出送PORT寄存器 //输入检测PIN寄存器 http://blog.csdn.net/armtravel/article/details/7525091 这是代码网址 现在我想在PD5口加一个蜂鸣器,使温度显示20度以上时报警,如何添加
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