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- #include <reg52.h>
- #define key P2
- #define LCD1602_DB P0
- sbit LCD1602_RS = P1^0;
- sbit LCD1602_RW = P1^1;
- sbit ADDR2 = P1^2;
- sbit ADDR3 = P1^3;//
- sbit ENLED = P1^4;//p1.4和p1.3是138使能端
- static unsigned char D=0;
- static unsigned char G=50;
-
- sbitbuzz=P1^6;
- bit flag1s = 0; //1s定时标志
- unsigned char T0RH = 0; //T0重载值的高字节
- unsigned char T0RL = 0; //T0重载值的低字节
- extern void delay_ms(unsigned int ms);
- extern void DelayX10us(unsigned char t);
- void ConfigTimer0(unsigned int ms);
- unsigned char IntToString(unsigned char*str, int dat);
- extern bit Start18B20();
- extern bit Get18B20Temp(int *temp);
- extern void InitLcd1602();
- extern void LcdShowStr(unsigned char x,unsigned char y, unsigned char *str);
- unsigned char code table0[]="D=";
- unsigned char code table1[]="G=";
- unsigned char code table2[]="TEMPIS:";
- unsigned char codetable3[]="DS18B20 ERR0R!";
- unsigned char codetable4[]="PLEASE CHECK!";
- unsigned char code table5[]="'C";
-
- unsigned char code table7[]="Wlecometo you!!";
- unsigned char code table8[]=" I am YYY_Temp!";
-
-
- void main()
- {
- bit res;
- int temp; //读取到的当前温度值
- int intT, decT; //温度值的整数和小数部分
- unsigned char len;
- unsigned char str[12];
- InitLcd1602();
- LcdShowStr(0, 0, table7);
- LcdShowStr(0, 1, table8);//5初始化显示5s
- delay_ms(5000);
- EX0=1;
- IT0=1;
- EA = 1; //开总中断
-
- ConfigTimer0(10); //T0定时10ms
-
- Start18B20(); //启动DS18B20
- delay_ms(5000);
-
- while (1)
- {
- if (flag1s) //每5秒更新一次温度
- {
- flag1s = 0;
- res = Get18B20Temp(&temp); //读取当前温度
- if (res) //读取成功时,刷新当前温度显示
- {
- intT = temp >> 4; //分离出温度值整数部分
- decT = temp & 0xF; //分离出温度值小数部分
- len = IntToString(str, intT);//整数部分转换为字符串
- str[len++] = '.'; //添加小数点
- decT = (decT*10) / 16; //二进制的小数部分转换为1位十进制位
- str[len++] = decT + '0'; //十进制小数位再转换为ASCII字符
- while (len < 6) //用空格补齐到6个字符长度
- {
- str[len++] = ' ';
- }
- str[len] = '\0'; //添加字符串结束符
- LcdShowStr(8, 1, str); //显示到液晶屏
-
- len= IntToString(str, D); //整数部分转换为字符串
- while (len < 6) //用空格补齐到6个字符长度
- {
- str[len++] = ' ';
- }
- str[len] = '\0'; //添加字符串结束符
- LcdShowStr(2, 0, str);
-
- len = IntToString(str, G); //整数部分转换为字符串
- while (len < 6) //用空格补齐到6个字符长度
- {
- str[len++] = ' ';
- }
- str[len] = '\0'; //添加字符串结束符
- LcdShowStr(10, 0, str);
-
- LcdShowStr(0,0, table0);
- LcdShowStr(8,0, table1);
- LcdShowStr(0,1, table2);
- LcdShowStr(13,1, table5);
- }
- else //读取失败时,提示错误信息
- {
- LcdShowStr(0, 0, table3);
- LcdShowStr(0, 1, table4);
- }
- Start18B20(); //重新启动下一次转换
- }
- //键盘设置上下限,0.3s扫描一次键值,同时更新一次上下限的显示
- key=0xf7;
- if(key!=0xf7)
- {
- delay_ms(10);
- switch(key)
- {
- case0xe7:
- D++;
- if(D==G)D=0;
- len= IntToString(str, D); //整数部分转换为字符串
- while(len < 6) //用空格补齐到6个字符长度
- {
- str[len++]= ' ';
- }
- str[len]= '\0'; //添加字符串结束符
- LcdShowStr(2,0, str);
- break;
- case0xd7:
- G--;
- if(G==D)G=50;
- len= IntToString(str, G); //整数部分转换为字符串
- while(len < 6) //用空格补齐到6个字符长度
- {
- str[len++]= ' ';
- }
- str[len]= '\0'; //添加字符串结束符
- LcdShowStr(10,0, str);
- break;
- }
- Start18B20();
- delay_ms(300);//等待0.3s开始下一次扫描键值
- }
- //光和声音警报部分
-
- if(D>temp*0.0625||G<temp*0.0625)//超值报警
- {
-
- ENLED= 0;
- ADDR3= 1;
- ADDR2= 1;
- LCD1602_RW= 1;
- LCD1602_RS= 0;
-
- LCD1602_DB=0xf0;
-
- buzz=1;
- DelayX10us(17);
- buzz=0;
- DelayX10us(17);
-
- ENLED= 1;//138使能关闭
- }
- if(D==(temp*0.0625)||G==(temp*0.0625))//等值报警
- {
- ENLED= 0;
- ADDR3= 1;
- ADDR2= 1;
- LCD1602_RW = 1;
- LCD1602_RS= 0;
-
- LCD1602_DB=0xf8;
- buzz=1;
- DelayX10us(100);
- buzz=0;
- DelayX10us(100);
- ENLED= 1;//138使能关闭
- }
- if((D<temp*0.0625&&(1.1*D)>temp*0.0625)||(G>temp*0.0625&&(0.9*G)<temp*0.0625))//接近报警
- {
- ENLED= 0;
- ADDR3= 1;
- ADDR2= 1;
- LCD1602_RW= 1;
- LCD1602_RS= 0;
-
- LCD1602_DB=0xfc;
- buzz=1;
- DelayX10us(2500);
- buzz=0;
- DelayX10us(2500);
- ENLED= 1;//138使能关闭
- }
-
-
- }
- }
- /* 整型数转换为字符串,str-字符串指针,dat-待转换数,返回值-字符串长度*/
- unsigned char IntToString(unsigned char*str, int dat)
- {
- signed char i = 0;
- unsigned char len = 0;
- unsigned char buf[6];
-
- if (dat < 0) //如果为负数,首先取绝对值,并在指针上添加负号
- {
- dat = -dat;
- *str++ = '-';
- len++;
- }
- else
- {
- *str++= ' ';
- len++;
- }
- do { //先转换为低位在前的十进制数组
- buf[i++] = dat % 10;
- dat /= 10;
- }while (dat > 0);
- len += i; //i最后的值就是有效字符的个数
- while (i-- > 0) //将数组值转换为ASCII码反向拷贝到接收指针上
- {
- *str++ = buf[i] + '0';
- }
- *str = '\0'; //添加字符串结束符
-
- return len; //返回字符串长度
- }
- /* 配置并启动T0,ms-T0定时时间 */
- void ConfigTimer0(unsigned int ms)
- {
- unsigned long tmp; //临时变量
-
- tmp = 11059200 / 12; //定时器计数频率
- tmp = (tmp * ms) / 1000; //计算所需的计数值
- tmp = 65536 - tmp; //计算定时器重载值
- tmp = tmp + 12; //补偿中断响应延时造成的误差
- T0RH = (unsigned char)(tmp>>8); //定时器重载值拆分为高低字节
- T0RL = (unsigned char)tmp;
- TMOD &= 0xF0; //清零T0的控制位
- TMOD |= 0x01; //配置T0为模式1
- TH0 = T0RH; //加载T0重载值
- TL0 = T0RL;
- ET0 = 1; //使能T0中断
- TR0 = 1; //启动T0
- }
- /* T0中断服务函数,完成1秒定时 */
- void InterruptTimer0() interrupt 1
- {
- static unsigned int tmr1s = 0;
-
- TH0 = T0RH; //重新加载重载值
- TL0 = T0RL;
- tmr1s++;
- if (tmr1s >= 500) //定时5s
- {
- tmr1s = 0;
- flag1s = 1;
- }
- }
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