105 lines
3.4 KiB
Plaintext
105 lines
3.4 KiB
Plaintext
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C51 COMPILER V9.60.7.0 ONEWIRE 03/10/2025 18:03:54 PAGE 1
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C51 COMPILER V9.60.7.0, 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;..\user) D
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-EBUG OBJECTEXTEND 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.
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4 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、运<E38081>
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-<2D><>速度和试题
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5 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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6 */
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7 #include "onewire.h"
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8 sbit DQ = P1 ^ 4;
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9 //
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10 void Delay_OneWire(unsigned int t) {
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11 1 unsigned char i;
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12 1 while (t--) {
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13 2 for (i = 0; i < 12; i++);
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14 2 }
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15 1 }
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16
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17 //
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18 void Write_DS18B20(unsigned char dat) {
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19 1 unsigned char i;
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20 1 for (i = 0; i < 8; i++) {
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21 2 DQ = 0;
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22 2 DQ = dat & 0x01;
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23 2 Delay_OneWire(5);
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24 2 DQ = 1;
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25 2 dat >>= 1;
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26 2 }
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27 1 Delay_OneWire(5);
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28 1 }
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29
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30 //
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31 unsigned char Read_DS18B20(void) {
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32 1 unsigned char i;
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33 1 unsigned char dat;
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34 1
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35 1 for (i = 0; i < 8; i++) {
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36 2 DQ = 0;
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37 2 dat >>= 1;
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38 2 DQ = 1;
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39 2 if (DQ) {
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40 3 dat |= 0x80;
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41 3 }
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42 2 Delay_OneWire(5);
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43 2 }
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44 1 return dat;
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45 1 }
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46
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47 //
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48 bit init_ds18b20(void) {
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49 1 bit initflag = 0;
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50 1
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51 1 DQ = 1;
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52 1 Delay_OneWire(12);
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53 1 DQ = 0;
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C51 COMPILER V9.60.7.0 ONEWIRE 03/10/2025 18:03:54 PAGE 2
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54 1 Delay_OneWire(80);
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55 1 DQ = 1;
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56 1 Delay_OneWire(10);
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57 1 initflag = DQ;
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58 1 Delay_OneWire(5);
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59 1
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60 1 return initflag;
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61 1 }
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62
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63 float rd_temperature() {
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64 1 unsigned char low, high;
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65 1 init_ds18b20();
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66 1 Write_DS18B20(0xcc);
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67 1 Write_DS18B20(0x44);
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68 1
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69 1 Delay_OneWire(200);
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70 1
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71 1 init_ds18b20();
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72 1 Write_DS18B20(0xcc);
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73 1 Write_DS18B20(0xbe);
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74 1 low = Read_DS18B20();
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75 1 high = Read_DS18B20();
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76 1 return (float)(high << 8 | low) * 0.0625;
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77 1 }
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MODULE INFORMATION: STATIC OVERLAYABLE
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CODE SIZE = 180 ----
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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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