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51单片机1602液晶屏显示温度程序
单片机源程序:
- /*********************************************************************************
- * 【编写时间】: 2014年3月5日
- * 【作 者】: 清翔电子:03
- * 【版 本】: 1.0
- * 【实验平台】: QX-MCS51 单片机开发板
- * 【外部晶振】: 11.0592mhz
- * 【主控芯片】: STC89C52RC
- * 【编译环境】: Keil μVisio4
- * 【程序功能】: 1602液晶显示温度
- * 【使用说明】: 1.使用1602液晶前先拔掉数码管J6跳帽,数码管与液晶不能共用
- 2.将1602液晶接到L2排母上,液晶面向开发板外部
- 3.若程序烧写完成后,1602液晶无显示,请调节开发板右下方的电位器RV1
- 4.注意18B20插接反向,弧形面向开发板外!
- **********************************************************************************/
- #include <reg52.H>
- #include <intrins.H>
- #include <math.H>
- #define uchar unsigned char
- #define uint unsigned int
- sbit RS = P0^7;
- sbit LCDEN = P0^5;
- sbit rw=P0^6;
- sbit BEEP=P3^6;
- /*********************************************************
- 500us延时函数
- 晶振:11.0592MHz
- *********************************************************/
- void delay500(void)
- {
- uchar i;
- for(i=230;i>0;i--);
- }
- void delayUs()
- {
- _nop_();
- }
- void delayMs(uint a)
- {
- uint i, j;
- for(i = a; i > 0; i--)
- for(j = 100; j > 0; j--);
- }
- void writeComm(uchar comm)
- {
- RS = 0;
- P2 = comm;
- LCDEN = 1;
- delayUs();
- LCDEN = 0;
- delayMs(1);
- }
- //写数据:RS=1, RW=0;
- void writeData(uchar dat)
- {
- RS = 1;
- P2 = dat;
- LCDEN = 1;
- delayUs();
- LCDEN = 0;
- delayMs(1);
- }
- void init()
- {
- rw=0;
- writeComm(0x38);
- writeComm(0x0c);
- writeComm(0x06);
- writeComm(0x01);
- }
- void writeString(uchar * str, uchar length)
- {
- uchar i;
- for(i = 0; i < length; i++)
- {
- writeData(str[i]);
- }
- }
-
- /**//*****************************DS18B20*******************************/
- sbit ds = P1^0;
- void dsInit()
- {
-
- unsigned int i;
- ds = 0;
- i = 100;
- while(i>0) i--;
- ds = 1;
- i = 4;
- while(i>0) i--;
- }
-
- void dsWait()
- {
- unsigned int i;
- while(ds);
- while(~ds);
- i = 4;
- while(i > 0) i--;
- }
- bit readBit()
- {
- unsigned int i;
- bit b;
- ds = 0;
- i++;
- ds = 1;
- i++; i++;
- b = ds;
- i = 8;
- while(i>0) i--;
- return b;
- }
- unsigned char readByte()
- {
- unsigned int i;
- unsigned char j, dat;
- dat = 0;
- for(i=0; i<8; i++)
- {
- j = readBit();
-
- dat = (j << 7) | (dat >> 1);
- }
- return dat;
- }
- void writeByte(unsigned char dat)
- {
- unsigned int i;
- unsigned char j;
- bit b;
- for(j = 0; j < 8; j++)
- {
- b = dat & 0x01;
- dat >>= 1;
-
- if(b)
- {
- ds = 0; i++; i++;
- ds = 1;
- i = 8; while(i>0) i--;
- }
- else
- {
- ds = 0;
- i = 8; while(i>0) i--;
- ds = 1;
- i++; i++;
- }
- }
- }
- void sendChangeCmd()
- {
- dsInit();
- dsWait();
- delayMs(1);
- writeByte(0xcc);
- writeByte(0x44);
- }
- void sendReadCmd()
- {
- dsInit();
- dsWait();
- delayMs(1);
- writeByte(0xcc);
- writeByte(0xbe);
- }
- int getTmpValue()
- {
- unsigned int tmpvalue;
- int value;
- float t;
- unsigned char low, high;
- sendReadCmd();
-
- low = readByte();
- high = readByte();
-
- tmpvalue = high;
- tmpvalue <<= 8;
- tmpvalue |= low;
- value = tmpvalue;
-
- \
- t = value * 0.0625;
- \
- value = t * 100 + (value > 0 ? 0.5 : -0.5); //大于0加0.5, 小于0减0.5
- return value;
- }
- void display(int v)
- {
- unsigned char count;
- unsigned char datas[] = {0, 0, 0, 0, 0};
- unsigned int tmp = abs(v);
- datas[0] = tmp / 10000;
- datas[1] = tmp % 10000 / 1000;
- datas[2] = tmp % 1000 / 100;
- datas[3] = tmp % 100 / 10;
- datas[4] = tmp % 10;
- writeComm(0xc0+3);
- if(v < 0)
- {
- writeString("- ", 2);
- }
- else
- {
- writeString("+ ", 2);
- }
- if(datas[0] != 0)
- {
- writeData('0'+datas[0]);
- }
- for(count = 1; count != 5; count++)
- {
- writeData('0'+datas[count]);
- if(count == 2)
- {
- writeData('.');
- }
- }
- }
- /**//*****************************DS18B20*******************************/
- void main()
- {
- uchar table[] = " xianzaiwendu: ";
- int i;//i储存转换后的温度值
- uchar j;
- sendChangeCmd();
- init();
- writeComm(0x80);
- writeString(table, 16);
- while(1)
- {
- delayMs(1000); //温度转换时间需要750ms以上
- writeComm(0xc0);
- i = getTmpValue();
- if(i > 2300)
- {
- for(j=200;j>0;j--)
- {
- BEEP=~BEEP; //输出频率1KHz
- delay500(); //延时500us
- }
-
- for(j=200;j>0;j--)
- {
- BEEP=~BEEP; //输出频率500Hz
- delay500(); //延时1ms
- delay500();
- }
- }
- display(i);
- sendChangeCmd();
- }
- }
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实验25 1602液晶显示温度.zip
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