课程设计实验报告
实验名称: 实验三:温度测量
班 级: 信息工程
实验日期: 2018年11月12日
一、 实验目的
1. 熟练电路设计、焊接操作;
2. 熟悉STC15W408AS芯片;
3. 实现DS18B20温度测量,并用LCD1602显示;
4、显示接收的CRC校验码。
二、 实验环境
1. 焊接工具:烙铁、焊锡丝、连接线、洞洞板;
2. 元器件:STC15W408AS芯片1片、温度传感DS18B20一枚、LCD1602显示屏一枚、5k电阻一只、10k电位器一只;
3. 软件开发环境:Keil uVision5。
三、 实验题目
实验:显示一支DS18B20温度值,并显示CRC校验码。
四、 实验原理
DS18B20主要由4部分组成:64 位ROM、温度传感器、非挥发的温度报警触发器TH和TL、配置寄存器。ROM中的64位序列号是出厂前被光刻好的,它可以看作是该DS18B20的地址序列码,每个DS18B20的64位序列号均不相同。64位ROM的排的循环冗余校验码(CRC=X^8+X^5+X^4+1)。 ROM的作用是使每一个DS18B20都各不相同,这样就可以实现一根总线上挂接多个DS18B20的目的。
LCD1602是一种工业字符型液晶,能够同时显示16x02即32个字符。LCD1602液晶显示原理 LCD1602液晶显示的原理是利用液晶的物理特性,通过电压对其显示区域进行控制,有电就有显示,这样即可以显示出图形。1602液晶也叫1602字符型液晶,它是一种专门用来显示字母、数字、符号等的点阵型液晶模块。
DS18B20的1脚接GND,2脚接5K的上拉电阻、接单片机的数据端,3脚接VCC;LCD的V0口需接入10K的电位器以控制亮与暗。
五、 实验代码
六、 实验总结
在本次实验中,通过对DS18B20以及LCD1602数据手册的学习,我学会了STC15W系列单片机的软件控制LCD1602的读写以及DS18B20有关温度的测量,增强了关于单片机功能实现的理解。
- #include"reg51.h"
- #include"intrins.h"
- #define FOSC 11059200L
- #define BAUD 9600
- #define NONE_PARITY 0
- #define PARITYBIT NONE_PARITY
- #define ds P26 // DS18B0、
- #define DataPort P1 // LCD1602
- #define uchar unsigned char
- #define uint unsigned char
- typedef unsigned char uint_8;
- typedef unsigned int uint_32;
- typedef unsigned short int uint_16;
- //LCD1602
- sbit LCM_RS=P3^7;
- sbit LCM_RW=P3^6;
- sbit LCM_EN=P3^5;
- sbit P22 = P2^2;
- sbit P26 = P2^6;
- sfr T2H = 0xD6;
- sfr T2L = 0xD7;
- sfr AUXR = 0x8E;
- unsigned char code crc_array[256] = {
- 0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83, 0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41,
- 0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e, 0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc,
- 0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0, 0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62,
- 0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d, 0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff,
- 0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5, 0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07,
- 0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58, 0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a,
- 0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6, 0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24,
- 0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b, 0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9,
- 0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f, 0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd,
- 0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92, 0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50,
- 0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c, 0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee,
- 0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1, 0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73,
- 0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49, 0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b,
- 0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4, 0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16,
- 0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a, 0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8,
- 0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7, 0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35,
- };
- bit ack = 0; //DS18B20
- bit busy;
- uint_8 dis[4];
- void SendData(uint_8 dat)//
- {
- while(busy);
- ACC = dat;
- busy = 1;
- SBUF = ACC;
- }
- void Uart() interrupt 4 using 1
- {
- if (RI)
- {
- uint_8 a;
- RI = 0;
- a=SBUF;
- P22 = RB8;
- }
- if (TI)
- {
- TI = 0;
- busy = 0;
- }
- }
- void lcd_printf(uint_8 *s,int temp_data)//
- {
- *s =temp_data/1000+0x30;
- temp_data=temp_data%1000;
- *++s =temp_data/100+0x30;
- temp_data=temp_data%100;
-
- *++s =temp_data/10+0x30;
- temp_data=temp_data%10;
- *++s =temp_data+0x30;
- }
- void Delay30us() //@11.0592MHz
- {
- unsigned char i;
- _nop_();
- _nop_();
- i = 80;
- while (--i);
- }
- void Delay100us() //@11.0592MHz
- {
- unsigned char i, j;
- _nop_();
- _nop_();
- i = 2;
- j = 15;
- do
- {
- while (--j);
- } while (--i);
- }
- void Delay200us() //@11.0592MHz
- {
- unsigned char i, j;
- i = 3;
- j = 35;
- do
- {
- while (--j);
- } while (--i);
- }
- void ds_reset()//DS18B20
- {
- ds = 1;
- ds = 0;
- Delay200us();
- Delay200us();
- ds = 1;
- Delay30us();
- if(0 == ds)
- {
- ack = 1;
- }
- else
- {
- ack = 0;
- }
- Delay200us();
- Delay100us();
- }
- void ds_send_byte(unsigned char byte)
- {
- unsigned char i;
-
- for(i = 0; i < 8; i++)
- {
- ds = 0;
- _nop_();
- _nop_();
- ds = byte & 0x01;
- byte >>= 1;
- Delay30us();
- ds = 1;
- }
- }
- bit ds_read_bit()
- {
- bit tmp;
- ds = 1;
- ds = 0;
- _nop_();
- _nop_();
- ds = 1;
- tmp = ds;
- Delay30us();
- return tmp;
- }
- unsigned char ds_read_byte()
- {
- unsigned char i,j,k;
-
- for(i = 0; i < 8; i++)
- {
- j = ds_read_bit();
- k = (j << 7) | (k >> 1);
- }
- return k;
- }
- void Delay200ms()
- {
- unsigned char i, j, k;
- _nop_();
- _nop_();
- i = 10;
- j = 31;
- k = 147;
- do
- {
- do
- {
- while (--k);
- } while (--j);
- } while (--i);
- }
- void intsend(int value)
- {
- uint_8 i;
- lcd_printf(dis, value);
- for(i=0;i<4;i++)
- {
- SendData(dis[i]);
- }
- }
- void WaitForEnable(void)
- {
- DataPort=0xff;
- LCM_RS=0;LCM_RW=1;_nop_();
- LCM_EN=1;_nop_();_nop_();
- while(DataPort&0x80);
- LCM_EN=0;
- }
- void WriteCommandLCM(uchar CMD,uchar A)
- {
- if(A)WaitForEnable();
- LCM_RS=0;LCM_RW=0;_nop_();
- DataPort=CMD;_nop_();
- LCM_EN=1;_nop_();_nop_();LCM_EN=0;
- }
- void InitLcd()
- {
- WriteCommandLCM(0x38,1);
- WriteCommandLCM(0x08,1);
- WriteCommandLCM(0x01,1);
- WriteCommandLCM(0x06,1);
- WriteCommandLCM(0x0c,1);
- }
- void WriteDataLCM(uchar dataW)
- {
- WaitForEnable();
- LCM_RS=1; LCM_RW=0;_nop_();
- DataPort=dataW;_nop_();
- LCM_EN=1;_nop_();_nop_();LCM_EN=0;
- }
- void DisplayOneChar(uchar X,uchar Y,uchar DData)
- {
- Y&=1;
- X&=15;
- if(Y)X|=0x40;
- X|=0x80;
- WriteCommandLCM(X,0);
- WriteDataLCM(DData);
- }
- void DisplayListChar(uchar X,uchar Y,uchar *DData,L)//
- {
- uchar ListLength=0;
- Y&=0x1;
- X&=0xF;
- while(L--)
- {
- DisplayOneChar(X,Y,DData[ListLength]);
- ListLength++;
- X++;
- }
- }
- void Display10BitData(int value,uchar x,uchar y,uchar wei)
- {
- lcd_printf(dis, value);
- DisplayListChar(x,y,dis,wei);
- }
- unsigned char CRC8_Table(unsigned char *p, char counter)//
- {
- unsigned char crc8 = 0;
- for(; counter>0; counter--)
- {
- crc8 = crc_array[crc8^*p];
- p++;
- }
- return crc8;
- }
- void main(void)
- {
- uint_8 T_low; //
- uint_8 DU[9]; //DS16B20
- uint_8 CRCC; //
- uint_16 T_high; //
- uint_16 tmp; //
- uint_8 ii;
- float temperature; //
-
- //LCD1602
- Delay200ms();
- Delay200ms();
- InitLcd();
- Delay200ms();
-
- SCON = 0x50;
- T2L = (65536 - (FOSC/4/BAUD));
- T2H = (65536 - (FOSC/4/BAUD))>>8;
- AUXR = 0x14;
- AUXR |= 0x01;
- ES = 1;
- EA=1;
- ACC=AUXR;
- while (1)
- {
- ds_reset();
- ds_send_byte(0xcc);
- ds_send_byte(0x44);
- ds_reset();
- ds_send_byte(0xcc);
- ds_send_byte(0xbe);
- DU[0] = ds_read_byte();
- DU[1] = ds_read_byte();
- DU[2] = ds_read_byte(); //0075
- DU[3] = ds_read_byte(); //0070
- DU[4] = ds_read_byte(); //0127
- DU[5] = ds_read_byte(); //0255
- DU[6] = ds_read_byte();
- DU[7] = ds_read_byte();
- DU[8] = ds_read_byte();
- CRCC=CRC8_Table(DU,8);
- T_low = DU[0];
- T_high = DU[1];
- tmp = (T_high << 8) | T_low;
- temperature = (float)tmp * 0.0625;
- intsend((int)(temperature)); DisplayListChar(0,0,"Temp:",5); Display10BitData((int)(temperature*100),5,0,2);
- DisplayOneChar(0,0,'.');
- temperature=temperature-(int)temperature;
- temperature*=100;
- Display10BitData((int)(temperature*100),8,0,2);
- DisplayOneChar(0,0,'C');
- Display10BitData(CRCC*10,7,1,3);
- Display10BitData(DU[8]*10,12,1,3);
-
- Delay200ms();
- }
- }
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