[ag-automation] configuration concept for fieldbus stack

Tue Jul 10 17:22:05 CEST 2007

Hello,
the xml-file is just an external representation of the parameters in the fddi-interface. The "Name"-Attribute is optional and just for better readability. The "Id" is the only possibility to identify the meaning of the parameter for the driver. The order is not enough, because it is possible to ommit parameter, to have different types of parameters and it is possible to extend the parameters in the future. The "Type" attribute is only necessary for the external xml-representation, to make it possible to write a driver independent import (in the parameter structure the value of the parameter is just a 32bit value). The driver itself knows how to interpret the value (as int, bool, string, etc.).

Regards

Dieter Hess 

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-----Ursprüngliche Nachricht-----
Von: Robert Schwebel [mailto:rsc at pengutronix.de] Im Auftrag von Robert Schwebel
Gesendet: Dienstag, 10. Juli 2007 17:11
An: ag-automation at www.osadl.org
Cc: Dieter Hess
Betreff: Re: [ag-automation] configuration concept for fieldbus stack

On Tue, Jul 10, 2007 at 10:45:51AM +0200, Dieter Hess wrote:
> here are a general XML-schema for a configuration of a fddi driver, a 
> example for modbus and a description of the modbus profile.

Great, thanks a lot! :-) However, in order to make it readable, here's the result of running pretty.xsl over the file:

----------8<----------8<----------8<----------8<----------8<----------8<----------
<?xml version="1.0" encoding="ISO-8859-1"?>

<FddiDevice xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:noNamespaceSchemaLocation="C:\Dokumente und Einstellungen\d.hess\Desktop\fddi\fddiconfig.xsd">

   <Id>0</Id>
   <Name>ModbusMaster</Name>

   <FddiDevice>
      <Id>1</Id>
      <Name>ModbusSlave1</Name>
      <FddiParam Id="1" Name="ParamAddress" Type="int">14</FddiParam>
      <FddiParam Id="2" Name="ParamValue" Type="int">0</FddiParam>
      <FddiParam Id="11" Name="ParamAddress" Type="int">22</FddiParam>
      <FddiParam Id="12" Name="ParamValue" Type="int">17</FddiParam>
      <FddiParam Id="1001" Name="TpuAdress" Type="int">64</FddiParam>
      <FddiParam Id="1002" Name="TpuSize" Type="int">8</FddiParam>
      <FddiParam Id="1003" Name="TpuGranularity" Type="int">1</FddiParam>
      <FddiParam Id="1004" Name="TpuUpdateRate" Type="int">100</FddiParam>
      <FddiParam Id="1004" Name="TpuDirectionWrite" Type="bool">false</FddiParam>
      <FddiParam Id="1011" Name="TpuAdress" Type="int">72</FddiParam>
      <FddiParam Id="1012" Name="TpuSize" Type="int">12</FddiParam>
      <FddiParam Id="1013" Name="TpuGranularity" Type="int">2</FddiParam>
      <FddiParam Id="1014" Name="TpuUpdateRate" Type="int">100</FddiParam>
      <FddiParam Id="1014" Name="TpuDirectionWrite" Type="bool">true</FddiParam>
   </FddiDevice>

   <FddiDevice>
      <Id>2</Id>
      <Name>ModbusSlave2</Name>
      <FddiParam Id="1" Name="ParamAddress" Type="int">4</FddiParam>
      <FddiParam Id="2" Name="ParamValue" Type="int">11</FddiParam>
      <FddiParam Id="1011" Name="TpuAdress" Type="int">20</FddiParam>
      <FddiParam Id="1012" Name="TpuSize" Type="int">4</FddiParam>
      <FddiParam Id="1013" Name="TpuGranularity" Type="int">1</FddiParam>
      <FddiParam Id="1014" Name="TpuUpdateRate" Type="int">50</FddiParam>
      <FddiParam Id="1014" Name="TpuDirectionWrite" Type="bool">true</FddiParam>
   </FddiDevice>

   <FddiParam Id="1" Name="TCPIP-Port" Type="int">1010</FddiParam>

</FddiDevice>
----------8<----------8<----------8<----------8<----------8<----------8<----------

Why are these "Id" attributes necessary? For the initialization params, the order in the xml file should be enough to specify the order the params have to be written into the bus.

Regarding the types, I'd suggest to directly map to the stdint types, also in order to avoid 32/64 bit interpretation problems.

Regards,
Robert Schwebel
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