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USB control messages:<nr>
<ul>
<li>Command : (cmd << 8) | param
<li>Index : only set for read
<li>Buffer : arguments, usually in WORDs
</ul>
<table>
<tr>
<td>Commandname</td>
<td>R/W</td>
<td>Code</td>
<td>Param</td>
<td>Ind.</td>
<td>Data</td>
<td>Description</td>
</tr>
<tr>
<td>Init Camera</td>
<td>W</td>
<td>0xD7</td>
<td>1</td>
<td>-</td>
<td>-</td>
<td>Send for opening the camera.</td>
</tr>
<tr>
<td>Exit Camera</td>
<td>W</td>
<td>0xD8</td>
<td>0</td>
<td>-</td>
<td>-</td>
<td>Send for closing the camera.</td>
</tr>
<tr>
<td>Select Picture</td>
<td>W</td>
<td>0xB2</td>
<td>0</td>
<td>-</td>
<td>WORD picnum</td>
<td>Select <b>picnum</b> picture (first is 1).</td>
</tr>
<tr>
<td>Download Image</td>
<td>W</td>
<td>0x93</td>
<td>Flags, 0x10,0x01. 0x00 works just fine.</td>
<td>-</td>
<td>-</td>
<td>Download selected picture by doing bulk reads (until no more data).</td>
</tr>
<tr>
<td>Download Thumbnail</td>
<td>W</td>
<td>0x9B</td>
<td>0x00 ?</td>
<td>-</td>
<td>-</td>
<td>Download selected thumbnail by doing bulk reads (until no more data).</td>
</tr>
<tr>
<td>Download Exif</td>
<td>W</td>
<td>0xE5</td>
<td>0x00</td>
<td>-</td>
<td>-</td>
<td>Download EXIF data for selected picture by doing bulk reads (until no more data).</td>
</tr>
<tr>
<td>Get Picture Info</td>
<td>R</td>
<td>0xAD</td>
<td>0x00</td>
<td>picnum</td>
<td>4 words: percentage, index number (in camera?), flags, unknown</td>
<td>Apparently gets image information about images in camera.</td>
</tr>
<tr>
<td>Get Picture Fileentry</td>
<td>R</td>
<td>0xB9</td>
<td>0x00</td>
<td>-</td>
<td>WORD check;<br>CHAR filename[14] (byteflipped) from 2..16<br>DWORD filesize (32bit?), unknown(32bit?) <BR></td>
<td>Gets the directory entry of the file.</td>
</tr>
<tr>
<td>Delete Picture</td>
<td>R</td>
<td>0xBA</td>
<td>WORD flag;</td>
<td>-</td>
<td>WORD result;</td>
<td>Deletes the selected picture. Parameter might be 0x40 (delete?) or 0x00 (?).</td>
</tr>
<tr>
<td>Get Number of Pictures?</td>
<td>R</td>
<td>0xB6</td>
<td>0x00</td>
<td>-</td>
<td>WORD unknown<br>
WORD numpics<br>
WORD unknown<br>
DWORD freemem?
</td>
<td>Gets several global parameters, like the number of pictures.The
last 32bit appear to be free memory?</td>
</tr>
</table>
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