126 lines
4.0 KiB
Plaintext
126 lines
4.0 KiB
Plaintext
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C51 COMPILER V9.59.0.0 ONEWIRE 05/02/2024 15:57:34 PAGE 1
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C51 COMPILER V9.59.0.0, COMPILATION OF MODULE ONEWIRE
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OBJECT MODULE PLACED IN .\Objects\onewire.obj
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COMPILER INVOKED BY: D:\Keil_v5\C51\BIN\C51.EXE ..\Driver\onewire.c OPTIMIZE(8,SPEED) BROWSE INCDIR(..\Driver) DEBUG OBJ
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-ECTEXTEND PRINT(.\Listings\onewire.lst) TABS(2) OBJECT(.\Objects\onewire.obj)
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line level source
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1 /* # 单总线代码片段说明
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2 1. 本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
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3 2. 参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、<E59E8B><E38081>
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-<2D>行速度和试题
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4 中对单片机时钟频率的要求，进行代码调试和修改。
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5 */
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6 #include "onewire.h"
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7 #include "REG52.H"
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8 #include "intrins.h"
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9 sbit DQ = P1 ^ 4; // 单总线数据口
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10 void Delay4us(void) //@12.000MHz
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11 {
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12 1 unsigned char data i;
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13 1
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14 1 _nop_();
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15 1 _nop_();
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16 1 i = 9;
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17 1 while (--i)
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18 1 ;
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19 1 }
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20
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21 //
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22 void Delay_OneWire(unsigned int t)
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23 {
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24 1 unsigned char i;
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25 1 while (t--)
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26 1 {
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27 2 for (i = 0; i < 12; i++)
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28 2 ;
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29 2 }
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30 1 }
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31
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32 //
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33 void Write_DS18B20(unsigned char dat)
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34 {
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35 1 unsigned char i;
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36 1 for (i = 0; i < 8; i++)
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37 1 {
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38 2 DQ = 0;
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39 2 DQ = dat & 0x01;
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40 2 Delay_OneWire(5);
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41 2 DQ = 1;
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42 2 dat >>= 1;
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43 2 }
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44 1 Delay_OneWire(5);
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45 1 }
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46
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47 //
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48 unsigned char Read_DS18B20(void)
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49 {
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50 1 unsigned char i;
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51 1 unsigned char dat;
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52 1
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53 1 for (i = 0; i < 8; i++)
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C51 COMPILER V9.59.0.0 ONEWIRE 05/02/2024 15:57:34 PAGE 2
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54 1 {
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55 2 DQ = 0;
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56 2 dat >>= 1;
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57 2 DQ = 1;
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58 2 Delay4us();
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59 2 if (DQ)
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60 2 {
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61 3 dat |= 0x80;
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62 3 }
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63 2 Delay_OneWire(5);
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64 2 }
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65 1 return dat;
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66 1 }
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67
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68 //
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69 bit init_ds18b20(void)
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70 {
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71 1 bit initflag = 0;
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72 1
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73 1 DQ = 1;
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74 1 Delay_OneWire(12);
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75 1 DQ = 0;
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76 1 Delay_OneWire(80);
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77 1 DQ = 1;
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78 1 Delay_OneWire(10);
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79 1 initflag = DQ;
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80 1 Delay_OneWire(5);
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81 1
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82 1 return initflag;
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83 1 }
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84
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85 float rd_temperature()
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86 {
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87 1 unsigned char low, high;
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88 1 init_ds18b20();
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89 1 Write_DS18B20(0xcc); // 跳过ROM
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90 1 Write_DS18B20(0x44); // 启动温度转换
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91 1 Delay_OneWire(200); // 等待温度转换
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92 1 init_ds18b20();
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93 1 Write_DS18B20(0xcc); // 跳过ROM
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94 1 Write_DS18B20(0xbe); // 读取温度值
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95 1 low = Read_DS18B20();
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96 1 high = Read_DS18B20();
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97 1 return (float)(high << 8 | low) * 0.0625;
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98 1 }
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MODULE INFORMATION: STATIC OVERLAYABLE
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CODE SIZE = 212 ----
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CONSTANT SIZE = ---- ----
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XDATA SIZE = ---- ----
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PDATA SIZE = ---- ----
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DATA SIZE = ---- ----
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IDATA SIZE = ---- ----
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BIT SIZE = ---- 1
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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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