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<li> Alle Daten werden in Paketen übertragen
<li> Alle Daten werden in Paketen übertragen
<li> Alle Daten werden vom Master "gepollt"
<li> Alle Daten werden vom Master "gepollt"
<li> Alle Devices können bis zu 254 Endpoints haben (<i>Endpoint 0 reserved</i>)
<li> Alle Devices müssen einen Endpoint 0 haben (das Device selber)
<li> Alle Devices können bis zu 254 Endpoints haben  
<li> Jeder Endpoint hat mind. 8 byte in-Buffer & mind. 8 byte out-Buffer  
<li> Jeder Endpoint hat mind. 8 byte in-Buffer & mind. 8 byte out-Buffer  
<li> Jeder Endpoint hat einen Status-Byte das Informationen über die Buffer bereitstellt
<li> Jeder Endpoint hat einen Status-Byte das Informationen über die Buffer bereitstellt
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<table border='1'>
<table border='1'>
<tr><td>Bit 7</td><td>Bit 6</td><td>Bit 5 - 0</td></tr>
<tr><td>Bit 7</td><td>Bit 6</td><td>Bit 5 - 0</td></tr>
<tr><td><i>Command/!Data</i></td><td><i>Parity</i></td><td>see below</td></tr>
<tr><td><i>Command&!Data</i></td><td><i>Parity</i></td><td>see below</td></tr>
</table>
</table>


<i>Note: Parity can be EVEN, ODD, XOR, NONE, Parity does include packetsize-Bits and all DATA</i><br>
<i>Note: Parity can be EVEN, ODD, XOR, NONE, Parity does include packetsize-Bits and all DATA</i><br>
<i>Note: Command/!DATA marks this packet as COMMAND packet or as DATA packet</i><br>
<i>Note: Command&!DATA marks this packet as either COMMAND packet or as DATA packet</i><br>
<br>
<br>


Zeile 53: Zeile 54:
<table border='1'>
<table border='1'>
<tr><td>Bit 7</td><td>Bit 6</td><td>Bit 5</td><td>Bit 4 - 1</td><td>Bit 0</td></tr>
<tr><td>Bit 7</td><td>Bit 6</td><td>Bit 5</td><td>Bit 4 - 1</td><td>Bit 0</td></tr>
<tr><td>1</td><td><i>Parity</i></td><td><i>0 (reserved)</i></td><td>COMMAND</td><td>Data packet count</td></tr>
<tr><td>1</td><td><i>Parity</i></td><td><i>0 (reserved)</i></td><td>COMMAND</td><td>Data packet count (0 or 1)</td></tr>
</table>
</table>
<br>
<br>
Zeile 59: Zeile 60:
<table border='1'>
<table border='1'>
<tr><td>Header</td><td>Byte 1</td></tr>
<tr><td>Header</td><td>Byte 1</td></tr>
<tr><td>1XXXXXXX</td><td>DATA (only if <header:0> is set)</td></tr>
<tr><td>1X0XXXXX</td><td>DATA (only if <header:0> is set)</td></tr>
</table>
</table>


Zeile 68: Zeile 69:
<table border='1'>
<table border='1'>
<tr><td>Bit 7</td><td>Bit 6</td><td>Bit 5</td><td>Bit 4</td><td>Bit 3 - 0</td></tr>
<tr><td>Bit 7</td><td>Bit 6</td><td>Bit 5</td><td>Bit 4</td><td>Bit 3 - 0</td></tr>
<tr><td>0</td><td><i>Parity</i></td><td><i>0 (reserved)</i></td><td><i>READ/!WRITE</i></td><td>Packetsize</td></tr>
<tr><td>0</td><td><i>Parity</i></td><td><i>0 (reserved)</i></td><td><i>READ&!WRITE</i></td><td>Packetsize</td></tr>
</table>
</table>
<br>
<br>
<i>Packet:</i><br>
<i>Packet:</i><br>
<table border='1'>
<table border='1'>
<tr><td>Header</td><td>Byte 1</td><td>Byte 2</td><td>Byte 3</td><td>Byte 4</td><td>Byte 5</td><td>Byte 6</td><td>Byte 7</td><td>Byte 8</td></tr><tr><td>XX0XXXXX</td><td>DATA</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td></tr>
<tr><td>Header</td><td>Byte 1</td><td>Byte 2</td><td>Byte 3</td><td>Byte 4</td><td>Byte 5</td><td>Byte 6</td><td>Byte 7</td><td>Byte 8</td></tr><tr><td>0X0XXXXX</td><td>DATA</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td><td>DATA (optional)</td></tr>
</table>
</table>
<i>Note: READ/!WRITE is the direction of data transfers</i><br>
<i>Note: READ&!WRITE is the direction of data transfers</i><br>
handled by userprogram<br>
handled by userprogram<br>
<br>
<br>
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copies complement of inputbuffer to outputbuffer<br>
copies complement of inputbuffer to outputbuffer<br>
to run bus-speed-test<br>
to run bus-speed-test<br>
<br><b>0x02</b>&nbsp;&nbsp;&nbsp;&nbsp;GET DEVICE DESCRIPTOR<br>
<br><b>0x02</b>&nbsp;&nbsp;&nbsp;&nbsp;GET AENDPOINT DESCRIPTOR<br>
returns information about the device<br>
max supported protocol version<br>
endpoint count<br>
...<br>
<br><b>0x03</b>&nbsp;&nbsp;&nbsp;&nbsp;GET DEVICE STATUS<br>
return device status, for example:<br>
ready for read<br>
ready for write<br>
...<br>
<br><b>0x04</b>&nbsp;&nbsp;&nbsp;&nbsp;GET ENDPOINT DESCRIPTOR<br>
2.byte: endpoint<br>
2.byte: endpoint<br>
returns information about the endpoint<br>
returns information about any endpoint<br>
can be display, soundd. ,networkd. ,inputd. ...<br>
must be less then max. device endpoints<br>
must be less then max. device endpoints<br>
<br><b>0x05</b>&nbsp;&nbsp;&nbsp;&nbsp;SET ENDPOINT<br>
<br><b>Endpoint 0</b>&nbsp;&nbsp;&nbsp;&nbsp;GET DEVICE DESCRIPTOR<br>
returns information about the device<br>
<table border='1'>
<tr><td>Header</td><td>DATA1</td><td>DATA2</td><td>DATA3</td></tr>
<tr><td bgcolor=grey></td><td><i>protocol version</i></td><td><i>endpoint count</i></td><td>-</td></tr>
</table>
 
<br><b>0x03</b>&nbsp;&nbsp;&nbsp;&nbsp;SET CURRENT ENDPOINT<br>
2.byte: endpoint<br>
2.byte: endpoint<br>
must be less then max. device endpoints<br>
must be less then max. device endpoints<br>
<br><b>0x06</b>&nbsp;&nbsp;&nbsp;&nbsp;GET CURRENT ENDPOINT<br>
<br><b>0x04</b>&nbsp;&nbsp;&nbsp;&nbsp;GET CURRENT ENDPOINT<br>
return active endpoint (default: 0)<br>
return active endpoint (default: 0)<br>
<br><b>0x07</b>&nbsp;&nbsp;&nbsp;&nbsp;GET CENDPOINT STATUS<br>
<br><b>0x05</b>&nbsp;&nbsp;&nbsp;&nbsp;GET CENDPOINT STATUS<br>
return current endpoint status, for example:<br>
return current endpoint status, for example:<br>
ready for read<br>
ready for read<br>
ready for write<bR>
ready for write<bR>
packet was dropped<br>
packet was invalid<br>
...<br>
...<br>
<br><b>0x08</b>&nbsp;&nbsp;&nbsp;&nbsp;CONFIGURE ENDPOINT<br>
<br><b>0x06</b>&nbsp;&nbsp;&nbsp;&nbsp;CONFIGURE ENDPOINT<br>
manage power, enable/disable endpoint<br>
manage power, enable/disable endpoint<br>
...<br>
...<br>
<br><b>0x09</b>&nbsp;&nbsp;&nbsp;&nbsp;GET AENDPOINT STATUS<br>
<br><b>0x07</b>&nbsp;&nbsp;&nbsp;&nbsp;GET AENDPOINT STATUS<br>
return any endpoint status<br>
return any endpoint status<br>
2.byte: endpoint<br>
2.byte: endpoint<br>

Aktuelle Version vom 1. Februar 2010, 17:43 Uhr

I2C Protokoll[Bearbeiten | Quelltext bearbeiten]

Version 0.4


DEFINITIONS[Bearbeiten | Quelltext bearbeiten]

layer0Hardwareebene (i2c)
layer1Packetebene
endpoint    externe Hardware/Software (nicht näher definiert)


Vorderungen[Bearbeiten | Quelltext bearbeiten]

  • Alle Devices sollen die max. Busgeschwindigkeit verwenden
  • Alle Daten werden in Paketen übertragen
  • Alle Daten werden vom Master "gepollt"
  • Alle Devices müssen einen Endpoint 0 haben (das Device selber)
  • Alle Devices können bis zu 254 Endpoints haben
  • Jeder Endpoint hat mind. 8 byte in-Buffer & mind. 8 byte out-Buffer
  • Jeder Endpoint hat einen Status-Byte das Informationen über die Buffer bereitstellt

    Device Overview[Bearbeiten | Quelltext bearbeiten]

    Device
      |----Endpoint 0
      |----Endpoint 1
      ...
      |----Endpoint n
         |---status_byte
         |---in_buffer
         |---out_buffer

    Packet[Bearbeiten | Quelltext bearbeiten]

    Overview
    Packet:

    HeaderData
    1 Byte1-8 Byte


    Header:

    Bit 7Bit 6Bit 5 - 0
    Command&!DataParitysee below

    Note: Parity can be EVEN, ODD, XOR, NONE, Parity does include packetsize-Bits and all DATA
    Note: Command&!DATA marks this packet as either COMMAND packet or as DATA packet

    COMMAND PACKET
    Header:

    Bit 7Bit 6Bit 5Bit 4 - 1Bit 0
    1Parity0 (reserved)COMMANDData packet count (0 or 1)


    Packet:

    HeaderByte 1
    1X0XXXXXDATA (only if <header:0> is set)

    handled by layer1

    DATA PACKET
    Header:

    Bit 7Bit 6Bit 5Bit 4Bit 3 - 0
    0Parity0 (reserved)READ&!WRITEPacketsize


    Packet:

    HeaderByte 1Byte 2Byte 3Byte 4Byte 5Byte 6Byte 7Byte 8
    0X0XXXXXDATADATA (optional)DATA (optional)DATA (optional)DATA (optional)DATA (optional)DATA (optional)DATA (optional)

    Note: READ&!WRITE is the direction of data transfers
    handled by userprogram

    COMMANDS[Bearbeiten | Quelltext bearbeiten]

    all "get" commands load data into the out_buffer & change status to ready for read
    all "set" commands store data into the in_buffer & change status to !ready for write
    Note:

  • if in_buffer is full/not ready to write the data is dropped
  • if out_buffer is not ready for read, 0 is returned
    querry status first !
    0x00
    invalid (reserved)

    0x01    PING
    copies complement of inputbuffer to outputbuffer
    to run bus-speed-test

    0x02    GET AENDPOINT DESCRIPTOR
    2.byte: endpoint
    returns information about any endpoint
    can be display, soundd. ,networkd. ,inputd. ...
    must be less then max. device endpoints

    Endpoint 0    GET DEVICE DESCRIPTOR
    returns information about the device
    HeaderDATA1DATA2DATA3
    protocol versionendpoint count-


    0x03    SET CURRENT ENDPOINT
    2.byte: endpoint
    must be less then max. device endpoints

    0x04    GET CURRENT ENDPOINT
    return active endpoint (default: 0)

    0x05    GET CENDPOINT STATUS
    return current endpoint status, for example:
    ready for read
    ready for write
    packet was dropped
    packet was invalid
    ...

    0x06    CONFIGURE ENDPOINT
    manage power, enable/disable endpoint
    ...

    0x07    GET AENDPOINT STATUS
    return any endpoint status
    2.byte: endpoint
    for example:
    ready for read
    ready for write
    ...


    DATA PACKET[Bearbeiten | Quelltext bearbeiten]

    Data packets are stored in the in_buffer of the current endpoint if READ/!WRITE is 0 & buffer is ready. The users programm is notified that theres new data.

    Data packets are read from the out_buffer of the current endpoint if READ/!WRITE is 1 & buffer is ready. Packet-length field should be ignored. The users programm is notified that the host request new data.


    Device Response[Bearbeiten | Quelltext bearbeiten]

    Header is ==0    NO VALID DATA
    the buffer you read from was not ready
    Header is > 0    DATA
    VALID:
    data-packet length should be greater than 0
    packet parity does match
    INVALID:
    data-packet length is 0
    packet parity doesn't match

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