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C51 COMPILER V9.56.0.0 DS18B20 04/30/2022 20:50:18 PAGE 1
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C51 COMPILER V9.56.0.0, COMPILATION OF MODULE DS18B20
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OBJECT MODULE PLACED IN DS18B20.OBJ
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COMPILER INVOKED BY: D:\Keil_v5\C51\BIN\C51.EXE DS18B20.c OPTIMIZE(8,SPEED) BROWSE DEBUG OBJECTEXTEND TABS(2)
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line level source
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1 #include "DS18B20.h"
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2
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3 sbit DS18B20=P3^2; //定义数据线
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4
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5 void delay_ms(unsigned int x)//延时1ms
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6 {
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7 1 unsigned int y,z;
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8 1 for(y=x;y>0;y--)
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9 1 for(z=110;z>0;z--);
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10 1 }
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11
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12 uchar DS18B20_Init() //初始化。成功返回1，不成功返回0.
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13 {
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14 1 uchar i;
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15 1 DS18B20 = 0; //将总线拉低480微秒~960微秒
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16 1 i = 70;
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17 1 while(i--); //延时642微秒
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18 1 DS18B20 = 1; //拉高总线，等待后续反馈
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19 1 i = 0;
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20 1 while(DS18B20) //等待DS18B20拉低总线
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21 1 {
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22 2 delay_ms(1); //定义的延迟1ms的延迟函数
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23 2 i++;
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24 2 if(i>5) //等待5ms以上
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25 2 {
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26 3 return 0; //初始化失败
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27 3 }
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28 2 }
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29 1 return 1; //初始化成功
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30 1 }
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31
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32 uchar DS18B20_ReadByte() //通过读取8次状态位达到读取字节的目的
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33 {
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34 1 uchar byte, bi;
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35 1 uint i, j;
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36 1 for(j=8; j>0; j--)
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37 1 {
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38 2 DS18B20 = 0; //先将总线拉低
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39 2 i++;
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40 2 DS18B20 = 1; //然后释放总线
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41 2 i++;
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42 2 i++; //延时6微秒等待数据稳定
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43 2 bi = DS18B20; //读取数据，从最低位开始读取
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44 2 byte = (byte >> 1) | (bi << 7); //从最低位开始记录，将byte依次右移
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45 2 i = 4; //读取完之后等待48微秒再接着读取下一个数
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46 2 while(i--);
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47 2 }
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48 1 return byte; //将读取完的字节保存
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49 1 }
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50
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51 void DS18B20_WriteByte(uchar dat)//函数通过循环写8个位实现写一个字节
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52 {
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53 1 uint i, j;
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54 1 for(j=0; j<8; j++)
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55 1 {
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C51 COMPILER V9.56.0.0 DS18B20 04/30/2022 20:50:18 PAGE 2
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56 2 DS18B20 = 0; //每写入一位数据之前先把总线拉低
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57 2 i++;
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58 2 DS18B20 = dat & 0x01; //然后写入一个数据，从最低位开始
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59 2 i=6;
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60 2 while(i--); //延时68微秒
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61 2 DS18B20 = 1; //释放总线，给总线1微秒恢复时间才能接着写入下一位
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62 2 dat >>= 1;
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63 2 }
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64 1 }
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65
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66 int DS18B20_ReadTemp() //读取的温度有两个字节，分别用tml和tmh存储两个字节
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67 {
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68 1 int temp = 0;
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69 1 uchar tmh, tml;
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70 1 DS18B20_Init(); //传感器初始化
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71 1 delay_ms(1); //延时1微秒
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72 1 DS18B20_WriteByte(0xcc); //跳过读取序列号操作
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73 1 DS18B20_WriteByte(0x44); //温度转换指令
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74 1 //完成温度转换功能
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75 1 DS18B20_Init(); //传感器初始化
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76 1 delay_ms(1);
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77 1 DS18B20_WriteByte(0xcc); //跳过读取序列号操作
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78 1 DS18B20_WriteByte(0xbe); //发送读取温度指令
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79 1 //然后等待转换完后发送读取温度命令
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80 1 tml = DS18B20_ReadByte(); //读取温度值共16位，先读低字节
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81 1 tmh = DS18B20_ReadByte(); //再读高字节
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82 1 temp = tmh; //先存高字节，后面通过移位存储低字节
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83 1 temp <<= 8;
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84 1 temp |= tml;
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85 1 return temp;
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86 1 }
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87
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88
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89 uint Temper_change()
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90 {
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91 1 uint temper;
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92 1 float tp;
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93 1 //temper=read_temper();
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94 1 temper=DS18B20_ReadTemp();
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95 1 if(temper<0) //考虑负温度的情况
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96 1 {
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97 2 temper=temper-1;
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98 2 temper=~temper;
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99 2 tp=temper*0.0625; //16位温度转换成10进制的温度
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100 2 temper=tp*100+0.5; //留两个小数点，并四舍五入
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101 2 }
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102 1 else
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103 1 {
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104 2 tp=temper*0.0625; //16位温度转换成10进制的温度
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105 2 temper=tp*100+0.5; //留两个小数点，并四舍五入
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106 2 }
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107 1 return temper;
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108 1 }
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MODULE INFORMATION: STATIC OVERLAYABLE
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CODE SIZE = 307 ----
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CONSTANT SIZE = ---- ----
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XDATA SIZE = ---- ----
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PDATA SIZE = ---- ----
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DATA SIZE = ---- 7
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IDATA SIZE = ---- ----
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C51 COMPILER V9.56.0.0 DS18B20 04/30/2022 20:50:18 PAGE 3
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BIT SIZE = ---- ----
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END OF MODULE INFORMATION.
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C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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