1-Wireマスターデバイスの構成

要約

各1-Wire^®デバイスにレーザ書込みされたリードオンリーメモリ(ROM)番号に埋め込まれている｢ファミリコード｣は、特定のデバイスタイプを表しています。各デバイスタイプは、異なる機能とコマンドを備えているため、1-Wireマスターは、この｢ファミリコード｣を正しいコマンドに変換する方法を知ることが必須となります。このアプリケーションノートでは、1-Wireマスターを動的に構成して、1-WireマスターにXML構成ファイルを提供することによって、これまで未知であった1-Wireデバイスタイプと正しく通信する方法を示しています。このアプリケーションノートは、元は、IEEE^® 1451.4 A Smart Transducer Interface for Sensors and Actuators—Mixed-Mode Communication Protocols and Transducer Electronic Data Sheet (TEDS) Formats標準化委員会をサポートするために作成されたものです。

はじめに

コマンドの表記

図1. DS18B20の温度読取りコマンドシーケンスと1-Wireマスター変換

デバイスタイプ

構成フォーマット

例

<?xml version="1.0" encoding="UTF-8"?>
<!-- The device description file follows the schema defined in ??? and
defines devices DS2433, DS2430, DS2406,DS2409,DS18S20,DS1920 and DS18B20.-->
<DeviceDescriptions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="\Device Schema\Device Schema.xsd">

<DeviceDescriptions>
   <Device FamilyCode="0x23">
      <Description>
         DS2433, 4kbit EEPROM
      </Description>

      <MemoryBank attributes="ReadWrite">
      <Description>
         Main Memory
      </Description>

      <StartAddress> 0x0000 </StartAddress>
      <Pages> 16 </Pages>
      <PageLength> 32 </PageLength>

      <Write>
         <WriteScratchPad>
             {M} {CRC16,start,0}
             0F {A0} {A1}
             {D0} {D1} {D2} {D3} {D4} {D5} {D6} {D7}
             {D8} {D9} {D10} {D11} {D12} {D13} {D14} {D15}
             {D16} {D17} {D18} {D19} {D20} {D21} {D22} {D23}
             {D24} {D25} {D26} {D27} {D28} {D29} {D30} {D31}
             FF FF {CRC16,check,0xB001}
          </WriteScratchPad>
          <CopyScratchPad>
              {M} 55 {A0} {A1} {P} 1F {L,10} {N} {T}
          </CopyScratchPad>
        </Write>

        <Read>
           <ReadMemory>
               {M} F0 {A0} {A1} {R}
           </ReadMemory>
        </Read>

     </MemoryBank>
  </Device>

  <Device FamilyCode="0x14">
     <Description>
        DS2430A, 32-byte EEPROM with locking register
       </Description>

     <MemoryBank attributes="ReadWrite">
        <Description>
           Main Memory
        </Description>

        <StartAddress> 0x0000 </StartAddress>
        <Pages> 1 </Pages>
        <PageLength> 32 </PageLength>

        <Write>
           <WriteScratchPad>
               {M} 0F {A0}
               {D0} {D1} {D2} {D3} {D4} {D5} {D6} {D7}
               {D8} {D9} {D10} {D11} {D12} {D13} {D14} {D15}
               {D16} {D17} {D18} {D19} {D20} {D21} {D22} {D23}
               {D24} {D25} {D26} {D27} {D28} {D29} {D30} {D31}
           </WriteScratchPad>
           <ReadScratchPad>
               {M} AA {A0}
               {d0} {d1} {d2} {d3} {d4} {d5} {d6} {d7}
               {d8} {d9} {d10} {d11} {d12} {d13} {d14} {d15}
               {d16} {d17} {d18} {d19} {d20} {d21} {d22} {d23}
               {d24} {d25} {d26} {d27} {d28} {d29} {d30} {d31}
           </ReadScratchPad>
           <CopyScratchPad>
               {M} 55 {P} A5 {L,20} {N}
           </CopyScratchPad>
        </Write>

        <Read>
           <ReadMemory>
               {M} F0 {A0} {R}
           </ReadMemory>
       </Read>

    </MemoryBank>
    <MemoryBank attributes="WriteOnce">
       <Description>
          Application Register
       </Description>

       <StartAddress> 0x0000 </StartAddress>
       <Pages> 1 </Pages>
       <PageLength> 8 </PageLength>

       <Write>
          <WriteAppReg>
              {M} 99 {A0}
              {D0} {D1} {D2} {D3} {D4} {D5} {D6} {D7}
          </WriteAppReg>
          <ReadAppReg>
              {M} C3 {A0}
              {d0} {d1} {d2} {d3} {d4} {d5} {d6} {d7}
          </ReadAppReg>
          <CopyAndLock>
              {M} 5A {P} A5 {L,20} {N}
          </CopyAndLock>
       </Write>

       <Read>
          <ReadAppReg>
              {M} C3 {A0} {R}
          </ReadAppReg>
       </Read>
    </MemoryBank>
  </Device>

  <Device FamilyCode="0x12">
     <Description>
        DS2406, dual channel switch with 1kbit EPROM
     </Description>

     <MemoryBank attributes="WriteOnce">
        <Description>
           Main Memory
        </Description>

        <StartAddress> 0x0000 </StartAddress>
        <Pages> 4 </Pages>
        <PageLength> 32 </PageLength>

        <Write>
           <WriteScratchPad>
               {M} {CRC16,start,0}
               0F {A0} {A1} {D0}
               FF FF {CRC16,check,0xB001}
           </WriteScratchPad>
           <Program>
               {U}
           </Program>
           <ReadVerify>
               {d0}
           </ReadVerify>
        </Write>

        <Read>
           <ReadMemory>
               {M} F0 {A0} {A1} {R}
           </ReadMemory>
        </Read>

     </MemoryBank>
     <SwitchChannel attributes="LowSide">
        <Description>
           PIO-A
        </Description>

        <ReadLatch AndMask="0x01" Polarity="0x00">
           {M} {CRC16,start,0}
           F5 55 FF {d0}
           FF FF {CRC16,check,0xB001}
        </ReadLatch>

        <ReadLevel AndMask="0x04" Polarity="0x04">
           {M} {CRC16,start,0}
           F5 55 FF {d0}
           FF FF {CRC16,check,0xB001}
        </ReadLevel>

        <EnableLatch>
           {M} {CRC16,start,0}
           F5 05 FF 00
           FF FF {CRC16,check,0xB001}
        </EnableLatch>

        <DisableLatch>
           {M} {CRC16,start,0}
           F5 05 FF FF
           FF FF {CRC16,check,0xB001}
        </DisableLatch>

     </SwitchChannel>

     <SwitchChannel attributes="LowSide">
        <Description>
           PIO-B
        </Description>

        <ReadLatch AndMask="0x02" Polarity="0x00">
           {M} {CRC16,start,0}
           F5 55 FF {d0}
           FF FF {CRC16,check,0xB001}
        </ReadLatch>

        <ReadLevel AndMask="0x08" Polarity="0x08">
           {M} {CRC16,start,0}
           F5 55 FF {d0}
           FF FF {CRC16,check,0xB001}
        </ReadLevel>

        <EnableLatch>
           {M} {CRC16,start,0}
           F5 09 FF 00
           FF FF {CRC16,check,0xB001}
        </EnableLatch>

        <DisableLatch>
           {M} {CRC16,start,0}
           F5 09 FF FF
           FF FF {CRC16,check,0xB001}
        </DisableLatch>

     </SwitchChannel>
  </Device>

  <Device FamilyCode="0x1F">
     <Description>
        DS2409, 1-Wire Coupler
     </Description>

     <SwitchChannel attributes="HighSide">
        <Description>
           Main
        </Description>

        <ReadLatch AndMask="0x01" Polarity="0x00">
           {M} 5A 18 {d0}
        </ReadLatch>

        <ReadLevel AndMask="0x02" Polarity="0x02">
           {M} 5A 18 {d0}
        </ReadLevel>

        <ReadActivity AndMask="0x10" Polarity="0x10">
           {M} 5A 18 {d0}
        </ReadActivity>

        <EnableLatch>
           {M} A5 FF
        </EnableLatch>

        <DisableLatch>
           {M} 66 FF
        </DisableLatch>
     </SwitchChannel>

     <SwitchChannel attributes="HighSide">
        <Description>
           Auxilary
        </Description>

        <ReadLatch AndMask="0x04" Polarity="0x00">
           {M} 5A 18 {d0}
        </ReadLatch>

        <ReadLevel AndMask="0x08" Polarity="0x08">
           {M} 5A 18 {d0}
        </ReadLevel>

        <EnableLatch>
           {M} 33 FF FF FF
        </EnableLatch>

        <DisableLatch>
           {M} 66 FF
        </DisableLatch>
      </SwitchChannel>
   </Device>

   <Device FamilyCode="0x10">
      <Description>
         DS18S20/DS1920, fixed resolution temperature
      </Description>

      <TemperatureChannel min="-55" max="125" step="0.5">
         <Read>
            <Recall>
               {M} B8
            </Recall>
            <Conversion>
               {M} {P} 44 {L,750} {N} {FF}
            </Conversion>
            <Result>
               {M} BE {CRC8,start,0} {d0} {d1}
               FF FF FF FF FF FF FF {CRC8,check,0x00}
            </Result>
         </Read>
      </TemperatureChannel>
   </Device>

   <Device FamilyCode="0x28">
      <Description>
         DS18B20, high-resolution temperature
      </Description>

      <TemperatureChannel min="-55" max="125" step="0.0625">
         <Setup>
            <WriteScatchPad>
               {M} 00 00 7F
            </WriteScatchPad>

            <CopyScatchPad>
               {M} {P} 48 {L,10} {N}
            </CopyScatchPad>
        </Setup>

        <Read>
           <Recall>
              {M} B8
           </Recall>
           <Conversion>
              {M} {P} 44 {L,750} {N} {FF}
           </Conversion>
           <Result>
              {M} BE {CRC8,start,0} {d0} {d1}
              FF FF FF FF FF FF FF {CRC8,check,0x00}
           </Result>
        </Read>
     </TemperatureChannel>
  </Device></DeviceDescriptions>

<?xml version="1.0" encoding="UTF-8"?>
<!-- The IEEE 1451.4 XML device description schema provides a template for manufacturers and
users of the IEEE14514 to add support for new devices to their systems. The schema defines
devices that support memory, switching and temperature reading. -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
      <xs:element name="Conversion" type="xs:string"/>
      <xs:element name="CopyAndLock" type="xs:string"/>
      <xs:element name="CopyScatchPad" type="xs:string"/>
      <xs:element name="CopyScratchPad" type="xs:string"/>
      <xs:element name="Description" type="xs:string"/>
      <xs:complexType name="IEEE1451_Dot4DeviceType">
             <xs:sequence>
                    <xs:element ref="Description"/>
                    <xs:element name="MemoryBank" type="MemoryBankType" minOccurs="0"
maxOccurs="unbounded"/>
                    <xs:element name="SwitchChannel" type="SwitchChannelType" minOccurs="0"
maxOccurs="unbounded"/>
                    <xs:element name="TemperatureChannel" type="TemperatureChannelType"
minOccurs="0"/>
             </xs:sequence>
             <xs:attribute name="FamilyCode" use="required">
                    <xs:simpleType>
                           <xs:restriction base="xs:NMTOKEN">
                                  <xs:enumeration value="0x10"/>
                                  <xs:enumeration value="0x12"/>
                                  <xs:enumeration value="0x14"/>
                                  <xs:enumeration value="0x1F"/>
                                  <xs:enumeration value="0x23"/>
                                  <xs:enumeration value="0x28"/>
                           </xs:restriction>
                    </xs:simpleType>
             </xs:attribute>
      </xs:complexType>
      <xs:element name="DeviceDescriptions">
             <xs:complexType>
                    <xs:sequence>
                            <xs:element name="Device" type="IEEE1451_Dot4DeviceType"
maxOccurs="unbounded"/>
                    </xs:sequence>
             </xs:complexType>
      </xs:element>
      <xs:element name="DisableLatch" type="xs:string"/>
      <xs:element name="EnableLatch" type="xs:string"/>
      <xs:complexType name="MemoryBankType">
             <xs:sequence>
                    <xs:element ref="Description"/>
                    <xs:element ref="StartAddress"/>
                    <xs:element ref="Pages"/>
                    <xs:element ref="PageLength"/>
                    <xs:element name="Write" type="WriteType"/>
                    <xs:element name="Read" type="ReadType"/>
                    <xs:element name="CRCInformation" minOccurs="0">
                           <xs:complexType>
                                  <xs:sequence maxOccurs="unbounded">
                                         <xs:element name="CRCStartBitPageLocation"
type="xs:unsignedLong"/>
                                         <xs:element name="CRCBitLength"
type="xs:unsignedLong"/>
                                  </xs:sequence>
                           </xs:complexType>
                    </xs:element>
             </xs:sequence>
             <xs:attribute name="attributes" use="required">
                    <xs:simpleType>
                           <xs:restriction base="xs:NMTOKEN">
                                  <xs:enumeration value="ReadWrite"/>
                                  <xs:enumeration value="WriteOnce"/>
                           </xs:restriction>
                    </xs:simpleType>
             </xs:attribute>
      </xs:complexType>
      <xs:element name="PageLength" type="xs:unsignedLong"/>
      <xs:element name="Pages" type="xs:unsignedLong"/>
      <xs:element name="Program" type="xs:string"/>
      <xs:complexType name="ReadType">
             <xs:sequence>
                    <xs:element ref="ReadMemory" minOccurs="0"/>
                    <xs:element ref="ReadAppReg" minOccurs="0"/>
                    <xs:element ref="Recall" minOccurs="0"/>
                    <xs:element ref="Conversion" minOccurs="0"/>
                    <xs:element ref="Result" minOccurs="0"/>
             </xs:sequence>
      </xs:complexType>
      <xs:complexType name="ReadActivityType">
             <xs:simpleContent>
                    <xs:extension base="xs:string">
                           <xs:attribute name="AndMask" type="xs:string" use="required"/>
                           <xs:attribute name="Polarity" type="xs:string" use="required"/>
                    </xs:extension>
             </xs:simpleContent>
      </xs:complexType>
      <xs:element name="ReadAppReg" type="xs:string"/>
      <xs:complexType name="ReadLatchType">
             <xs:simpleContent>
                    <xs:extension base="xs:string">
                           <xs:attribute name="AndMask" use="required">
                                  <xs:simpleType>
                                         <xs:restriction base="xs:NMTOKEN">
                                                <xs:enumeration value="0x01"/>
                                                <xs:enumeration value="0x02"/>
                                                <xs:enumeration value="0x04"/>
                                         </xs:restriction>
                                  </xs:simpleType>
                           </xs:attribute>
                           <xs:attribute name="Polarity" type="xs:decimal" use="required"/>
                    </xs:extension>
             </xs:simpleContent>
      </xs:complexType>
      <xs:complexType name="ReadLevelType">
             <xs:simpleContent>
                    <xs:extension base="xs:string">
                           <xs:attribute name="AndMask" use="required">
                                  <xs:simpleType>
                                         <xs:restriction base="xs:NMTOKEN">
                                                <xs:enumeration value="0x02"/>
                                                <xs:enumeration value="0x04"/>
                                                <xs:enumeration value="0x08"/>
                                         </xs:restriction>
                                  </xs:simpleType>
                           </xs:attribute>
                           <xs:attribute name="Polarity" use="required">
                                  <xs:simpleType>
                                         <xs:restriction base="xs:NMTOKEN">
                                                <xs:enumeration value="0x02"/>
                                                <xs:enumeration value="0x04"/>
                                                <xs:enumeration value="0x08"/>
                                         </xs:restriction>
                                  </xs:simpleType>
                           </xs:attribute>
                    </xs:extension>
             </xs:simpleContent>
      </xs:complexType>
      <xs:element name="ReadMemory" type="xs:string"/>
      <xs:element name="ReadScratchPad" type="xs:string"/>
      <xs:element name="ReadVerify" type="xs:string"/>
      <xs:element name="Recall" type="xs:string"/>
      <xs:element name="Result" type="xs:string"/>
      <xs:complexType name="SetupType">
             <xs:sequence>
                    <xs:element ref="WriteScatchPad"/>
                    <xs:element ref="CopyScatchPad"/>
             </xs:sequence>
      </xs:complexType>
      <xs:element name="StartAddress" type="xs:string"/>
      <xs:complexType name="SwitchChannelType">
             <xs:sequence>
                    <xs:element ref="Description"/>
                    <xs:element name="ReadLatch" type="ReadLatchType"/>
                    <xs:element name="ReadLevel" type="ReadLevelType"/>
                    <xs:element name="ReadActivity" type="ReadActivityType" minOccurs="0"/>
                    <xs:element ref="EnableLatch"/>
                    <xs:element ref="DisableLatch"/>
             </xs:sequence>
             <xs:attribute name="attributes" use="required">
                    <xs:simpleType>
                           <xs:restriction base="xs:NMTOKEN">
                                  <xs:enumeration value="HighSide"/>
                                  <xs:enumeration value="LowSide"/>
                           </xs:restriction>
                    </xs:simpleType>
             </xs:attribute>
      </xs:complexType>
      <xs:complexType name="TemperatureChannelType">
             <xs:sequence>
                    <xs:element name="Setup" type="SetupType" minOccurs="0"/>
                    <xs:element name="Read" type="ReadType"/>
             </xs:sequence>
             <xs:attribute name="min" type="xs:byte" use="required"/>
             <xs:attribute name="max" type="xs:byte" use="required"/>
             <xs:attribute name="step" use="required">
                    <xs:simpleType>
                           <xs:restriction base="xs:NMTOKEN">
                                  <xs:enumeration value="0.0625"/>
                                  <xs:enumeration value="0.5"/>
                           </xs:restriction>
                    </xs:simpleType>
             </xs:attribute>
      </xs:complexType>
      <xs:complexType name="WriteType">
             <xs:sequence>
                    <xs:element ref="WriteScratchPad" minOccurs="0"/>
                    <xs:element ref="ReadScratchPad" minOccurs="0"/>
                    <xs:element ref="CopyScratchPad" minOccurs="0"/>
                    <xs:element ref="WriteAppReg" minOccurs="0"/>
                    <xs:element ref="ReadAppReg" minOccurs="0"/>
                    <xs:element ref="CopyAndLock" minOccurs="0"/>
                    <xs:element ref="Program" minOccurs="0"/>
                    <xs:element ref="ReadVerify" minOccurs="0"/>
             </xs:sequence>
     </xs:complexType>
     <xs:element name="WriteAppReg" type="xs:string"/>
     <xs:element name="WriteScatchPad" type="xs:string"/>
     <xs:element name="WriteScratchPad" type="xs:string"/>
</xs:schema>

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