http://wiki.mcselec.com/bavr/index.php?action=history&feed=atom&title=CmdMemCrc 2026-05-16T10:09:13Z Revision history for this page on the wiki MediaWiki 1.18.6 http://wiki.mcselec.com/bavr/index.php?title=CmdMemCrc&diff=4801&oldid=prev 2014-12-12T17:20:10Z

<p>Created page with &quot;= &lt;span class=&quot;f_Header&quot;&gt;Action&lt;/span&gt; = Compute a CRC-32 for memory. &lt;span style=&quot;font-family: Arial;&quot;&gt; &lt;/span&gt; &lt;span style=&quot;font-family: Arial;&quot;&gt; &lt;/span&gt; = &lt;sp...&quot;</p> <p><b>New page</b></p><div>= &lt;span class=&quot;f_Header&quot;&gt;Action&lt;/span&gt; =<br /> <br /> Compute a CRC-32 for memory.<br /> <br /> &lt;span style=&quot;font-family: Arial;&quot;&gt;&amp;nbsp;&lt;/span&gt;<br /> <br /> &lt;span style=&quot;font-family: Arial;&quot;&gt;&amp;nbsp;&lt;/span&gt;<br /> <br /> = &lt;span class=&quot;f_Header&quot;&gt;Syntax&lt;/span&gt; =<br /> <br /> &lt;span class=&quot;f_Syntax&quot;&gt;CmdMemCrc&lt;/span&gt;&lt;span style=&quot;font-weight: bold; color: rgb(0, 0, 128);&quot;&gt;&amp;nbsp;&lt;/span&gt;ptr, num, result<br /> <br /> &lt;span style=&quot;font-family: Arial;&quot;&gt;&amp;nbsp;&lt;/span&gt;<br /> <br /> &lt;span style=&quot;font-family: Arial;&quot;&gt;&amp;nbsp;&lt;/span&gt;<br /> <br /> = &lt;span class=&quot;f_Header&quot;&gt;Remarks&lt;/span&gt; =<br /> &lt;div style=&quot;padding: 0px; margin: 0px;&quot;&gt;<br /> {| cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; style=&quot;border: none; border-spacing: 0px; border-collapse: collapse;&quot;<br /> |- style=&quot;vertical-align: top;&quot;<br /> | valign=&quot;top&quot; width=&quot;65&quot; style=&quot;width: 65px; border: 2px solid rgb(0, 0, 0);&quot; | <br /> ptr<br /> <br /> | valign=&quot;top&quot; width=&quot;767&quot; style=&quot;width: 767px; border: 2px solid rgb(0, 0, 0);&quot; | <br /> Starting address of the memory block<br /> <br /> |- style=&quot;vertical-align: top;&quot;<br /> | valign=&quot;top&quot; width=&quot;65&quot; style=&quot;width: 65px; border: 2px solid rgb(0, 0, 0);&quot; | <br /> num<br /> <br /> | valign=&quot;top&quot; width=&quot;767&quot; style=&quot;width: 767px; border: 2px solid rgb(0, 0, 0);&quot; | <br /> Number of bytes in the source memory block<br /> <br /> |- style=&quot;vertical-align: top;&quot;<br /> | valign=&quot;top&quot; width=&quot;65&quot; style=&quot;width: 65px; border: 2px solid rgb(0, 0, 0);&quot; | <br /> result<br /> <br /> | valign=&quot;top&quot; width=&quot;767&quot; style=&quot;width: 767px; border: 2px solid rgb(0, 0, 0);&quot; | <br /> Output parameter; written with the CRC-32 after command execution. The completion of this function is<br /> <br /> detected when the value of&amp;nbsp;&lt;span style=&quot;color: rgb(128, 0, 128);&quot;&gt;REG_CMD_READ&lt;/span&gt;&amp;nbsp;is equal to&amp;nbsp;&lt;span style=&quot;color: rgb(128, 0, 128);&quot;&gt;REG_CMD_WRITE.&lt;/span&gt;<br /> <br /> |}<br /> &lt;/div&gt;<br /> &amp;nbsp;<br /> <br /> &amp;nbsp;<br /> <br /> &amp;nbsp;<br /> <br /> &lt;span style=&quot;font-family: Arial;&quot;&gt;&amp;nbsp;&lt;/span&gt;<br /> <br /> = &lt;span class=&quot;f_Header&quot;&gt;Example&lt;/span&gt; =<br /> <br /> &lt;source lang=&quot;bascomavr&quot;&gt;<br /> ' Pseudocode<br /> <br /> ' To compute the CRC-32 of the first 1K byte of FT800 memory, first record the value <br /> ' of REG_CMD_WRITE, execute the command, wait for completion, then read the 32-bit value at result.<br /> <br /> x = Rd16(REG_CMD_WRITE)<br /> CmdMemCrc 0, 1024, 0<br /> Print Rd32(RAM_CMD + x + 12)<br /> &lt;/source&gt;<br /> <br /> {{Languages}}<br /> <br /> [[Category:FT800 Commands]]</div>

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