📄 ds18b20

📁 一个针灸治疗仪源代码,包括记时,显示AD采样程序,开发环境keil.使用的芯片PLC89C935
💻
📖 第 1 页 / 共 3 页
字号:
上一页 1 23
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt" 
    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">1<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">0<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">11位<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 122pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    width=163>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">375ms<O:P> 
      </O:P></SPAN></P></TD></TR>
  <TR>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt" 
    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">1<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">1<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">12位<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 122pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    width=163>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">750ms<O:P> 
      </O:P></SPAN></P></TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 30px">　</P>
<P style="TEXT-INDENT: 30px"><SPAN class=main1><B>表1 
DS1820温度数字对应关系表</B></SPAN></P>
<TABLE borderColorDark=#ffffff width="100%" borderColorLight=#000000 border=1>
  <TBODY>
  <TR class=main>
    <TD align=middle width="33%">温度℃</TD>
    <TD align=middle width="33%">输出的二进制码</TD>
    <TD align=middle width="34%">对应的十六进制码</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">+125</TD>
    <TD align=middle width="33%">0000000011111010</TD>
    <TD align=middle width="34%">00FAH</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">+25</TD>
    <TD align=middle width="33%">0000000000110010</TD>
    <TD align=middle width="34%">0032H</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">+1/2</TD>
    <TD align=middle width="33%">0000000000000001</TD>
    <TD align=middle width="34%">0001H</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">0</TD>
    <TD align=middle width="33%">0000000000000000</TD>
    <TD align=middle width="34%">0000H</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">-1/2</TD>
    <TD align=middle width="33%">1111111111111111</TD>
    <TD align=middle width="34%">FFFFH</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">-25</TD>
    <TD align=middle width="33%">1111111111001110</TD>
    <TD align=middle width="34%">FFCEH</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">-55</TD>
    <TD align=middle width="33%">1111111110010010</TD>
    <TD align=middle width="34%">FF92H</TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 0px"><SPAN class=main1>2.3 64位激光ROM</SPAN></P>
<P style="TEXT-INDENT: 30px"><SPAN class=main1>64位ROM的结构如下：<BR><IMG height=33 
hspace=23 src="D:\work\program\C51\acupunture0910\DS18B20测量温度.files\mhtC(1).tmp" 
width=236 vspace=7 border=0><BR></SPAN>&nbsp;&nbsp;&nbsp; <SPAN 
class=main1>开始8位是产品类型的编号（DS1820为10H），接着是每个器件的唯一的序号，共有48位，最后8位是前56位的CRC校验码，这也是多个DS1820可以采用一线进行通信的原因。主机操作ROM的命令有五种，如表2所列<BR><BR><B>表2 
DS180的ROM命令</B></SPAN></P>
<TABLE borderColorDark=#ffffff width="100%" borderColorLight=#000000 border=1>
  <TBODY>
  <TR class=main>
    <TD align=middle width="50%">指&nbsp; 令</TD>
    <TD align=middle width="50%">说&nbsp; 明</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">读ROM（33H）</TD>
    <TD width="50%">读DS1820的序列号</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">匹配ROM（55H）</TD>
    <TD width="50%">继读完64位序列号的一个命令，用于多个DS1820时定位</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">跳过ROM（CCH）</TD>
    <TD width="50%">此命令执行后的存储器操作将针对在线的所有DS1820</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">搜ROM（F0H）</TD>
    <TD width="50%">识别总线上各器件的编码，为操作各器件作好准备</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">报警搜索（ECH）</TD>
    <TD width="50%">仅温度越限的器件对此命令作出响应</TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 0px"><SPAN class=main1>2.4 高速暂存器</SPAN></P>
<P style="TEXT-INDENT: 30px"><SPAN class=main1>它由便笺式RAM和非易失性电擦写 
EERAM组成，后者用于存储TH、TL值。数据选写入RAM，经校验后再传给EERAM。便笺式EAM点9个字节，包括温度信息（第1、2字节）、TH和TL值（3、4字节）、计数寄存器（7、8字节）、CRC（第9字节）等，第5、6字节不用。暂存器的命令共6条，见表3所列。<BR><BR><B>表3 
DS1820贮控制命令</B></SPAN></P>
<TABLE borderColorDark=#ffffff width="100%" borderColorLight=#000000 border=1>
  <TBODY>
  <TR class=main>
    <TD align=middle width="50%">指&nbsp; 令</TD>
    <TD align=middle width="50%">说&nbsp; 明</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">温度转换（44H）</TD>
    <TD align=left width="50%">启动在线DS1820做温度A/D转换</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">读数据（BEH）</TD>
    <TD align=left width="50%">从高速暂存器读9bits温度值和CRC值</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">写数据（4EH）</TD>
    <TD align=left width="50%">将数据写入高速暂存器的第2和第3字节和第4字节(<FONT 
      face="Times New Roman">configuration registers)</FONT>中</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">复制（48H）</TD>
    <TD align=left width="50%">将高速暂存器中第2和第3字节复制到EERAM</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">读EERAM（B8H）</TD>
    <TD align=left width="50%">将EERAM内容写入高速暂存器中第2和第3字节</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">读电源供电方式（B4H）</TD>
    <TD align=left width="50%">了解DS1820的供电方式</TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 30px"><SPAN 
class=main1>在正常测温情况下，DS1820的测温分辨力为0.5℃，可采用下述方法获得高分辨率的温度测量结果：首先用DS1820提供的读暂存器指令（BEH）读出以0.5℃为分辨率的温度测量结果，然后切去测量结果中的最低有效位（LSB），得到所测实际温度的整数部分Tz，然后现用BEH指令取计数器1的计数剩余值Cs和每度计数值CD。考虑到DS1820测量温度的整数部分以0.25℃、0.75℃为进位界限的关系，实际温度Ts可用下式计算：</SPAN></P>
<P style="TEXT-INDENT: 30px"><SPAN 
class=main1>Ts=（Tz-0.25℃）+(CD-Cs)/CD</SPAN></P></BODY></HTML>
上一页 1 23
💿 文件大小 82 K
👤 上传用户 andyandnancy
📂 所属分类其他嵌入式/单片机内容
🏷️ 相关标签

#keil #C935 #PLC #89C
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -