mmc_8h.html

MP3 Player Source Code

00321     ConsoleWrite(<span class="stringliteral">"\rInitMMC ok.\r"</span>);
00322   }
00323 
00324   <span class="comment">/* All OK return */</span>
00325   <span class="keywordflow">return</span> 0; <span class="comment">//ok and MMC supports seek-before-read</span>
00326 
00327 }
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<a class="anchor" name="a3" doxytag="mmc.h::ReadPhysicalSector" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char ReadPhysicalSector           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Perform block read of previously sought sector to diskSect. 
<p>

<p>
Definition at line <a class="el" href="mmc_8c-source.html#l00477">477</a> of file <a class="el" href="mmc_8c-source.html">mmc.c</a>.
<p>
References <a class="el" href="board_8h-source.html#l00075">LED_OFF</a>, <a class="el" href="board_8h-source.html#l00072">LED_ON</a>, <a class="el" href="board_8h-source.html#l00159">MMC_NOT_SELECTED</a>, <a class="el" href="board_8h-source.html#l00156">MMC_SELECTED</a>, <a class="el" href="board_8h-source.html#l00153">MMC_XCS</a>, <a class="el" href="mmc_8c-source.html#l00102">MmcWaitForData()</a>, <a class="el" href="mmc_8c-source.html#l00332">PerformBlockRead()</a>, <a class="el" href="board_8h-source.html#l00262">Public</a>, <a class="el" href="board_8h-source.html#l00066">RED_LED</a>, and <a class="el" href="board_8c-source.html#l00026">SPI8Clocks()</a>.
<p>
Referenced by <a class="el" href="mmc_8c-source.html#l00249">InitMMC()</a>, and <a class="el" href="storage_8c-source.html#l00110">ReadDiskSector()</a>.
<p>
<pre class="fragment"><div>00477                                          {
00478 
00479   <a class="code" href="board_8h.html#a10">RED_LED</a> = <a class="code" href="board_8h.html#a12">LED_ON</a>; <span class="comment">/* Disk Read LED on */</span>
00480 
00481   <a class="code" href="board_8h.html#a29">MMC_XCS</a> = <a class="code" href="board_8h.html#a30">MMC_SELECTED</a>;
00482   <span class="comment">//ConsoleWrite("&lt;wait&gt;");</span>
00483   <a class="code" href="mmc_8c.html#a1">MmcWaitForData</a>();
00484   
00485   <span class="comment">//ConsoleWrite("&lt;read&gt;");</span>
00486   <a class="code" href="mmc_8c.html#a6">PerformBlockRead</a>();
00487 
00488   <span class="comment">//ConsoleWrite("&lt;deselect&gt;");</span>
00489   <span class="comment">/* generate SPI clock edges to finish up the command */</span>
00490 
00491   <a class="code" href="board_8h.html#a48">SPI8Clocks</a>(4); <span class="comment">//Send 8*4=32 clocks (4 ff's) to MMC to be nice.</span>
00492   <a class="code" href="board_8h.html#a29">MMC_XCS</a> = <a class="code" href="board_8h.html#a31">MMC_NOT_SELECTED</a>;
00493   <a class="code" href="board_8h.html#a48">SPI8Clocks</a>(4); <span class="comment">//Again, give the poor MMC some clocks, it likes them.</span>
00494 
00495   <a class="code" href="board_8h.html#a10">RED_LED</a> = <a class="code" href="board_8h.html#a13">LED_OFF</a>; <span class="comment">/* Disk Read LED off */</span>
00496 
00497   <span class="keywordflow">return</span> 0; <span class="comment">//ok return</span>
00498 }
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<a class="anchor" name="a2" doxytag="mmc.h::SeekSector" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char SeekSector           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">unsigned long&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>sectorN</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Perform MMC Seek Command for offset sectorN*512. 
<p>

<p>
Definition at line <a class="el" href="mmc_8c-source.html#l00431">431</a> of file <a class="el" href="mmc_8c-source.html">mmc.c</a>.
<p>
References <a class="el" href="unionAddress.html#o1">Address::b</a>, <a class="el" href="buffer_8h-source.html#l00131">Address::B::b0</a>, <a class="el" href="buffer_8h-source.html#l00132">Address::B::b1</a>, <a class="el" href="buffer_8h-source.html#l00133">Address::B::b2</a>, <a class="el" href="mmc_8c-source.html#l00399">ConsoleDecipherMMCResponse()</a>, <a class="el" href="buffer_8h-source.html#l00129">Address::l</a>, <a class="el" href="board_8h-source.html#l00159">MMC_NOT_SELECTED</a>, <a class="el" href="board_8h-source.html#l00153">MMC_XCS</a>, <a class="el" href="mmc_8c-source.html#l00019">MmcCommand()</a>, <a class="el" href="board_8h-source.html#l00262">Public</a>, <a class="el" href="mmc_8c-source.html#l00221">RebootMMC()</a>, and <a class="el" href="buffer_8c-source.html#l00015">sectorAddress</a>.
<p>
Referenced by <a class="el" href="mmc_8c-source.html#l00249">InitMMC()</a>, <a class="el" href="storage_8c-source.html#l00071">PrepareToReadDiskSector()</a>, and <a class="el" href="storage_8c-source.html#l00110">ReadDiskSector()</a>.
<p>
<pre class="fragment"><div>00431                                                       {
00432   
00433   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c;
00434   
00435 <span class="preprocessor">#ifdef MMCDEBUG    </span>
00436 <span class="preprocessor"></span>  ConsoleWrite(<span class="stringliteral">"{s"</span>); <span class="comment">//Seek called</span>
00437 <span class="preprocessor">#endif</span>
00438 <span class="preprocessor"></span>
00439   <span class="keywordflow">do</span>{
00440     <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> = sectorN * 2; <span class="comment">//convert to bytes (combined with 8bit shift)</span>
00441     c=<a class="code" href="mmc_8c.html#a0">MmcCommand</a>(0x51,<a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o2">b2</a>,<a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o1">b1</a>,
00442                  <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o0">b0</a>, 0);
00443     <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> = <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> &gt;&gt; 1; <span class="comment">//convert back to blocks</span>
00444 
00445     <span class="comment">//if MMC returs "nothing" (0xff) or 0x81(busy), </span>
00446     <span class="comment">//toggle chip select and retry</span>
00447     <span class="keywordflow">if</span> ((c==0xff)||(c==0x81)){
00448       c=0xff;
00449       <a class="code" href="mmc_8c.html#a4">RebootMMC</a>();
00450     }
00451     <span class="keywordflow">if</span> (c==0x01){ <span class="comment">//MMC says "busy"</span>
00452       c=0xff; <span class="comment">//try again</span>
00453     }
00454 
00455   }<span class="keywordflow">while</span>(c==0xff); <span class="comment">//repeat until we get signal from MMC.</span>
00456   
00457   <span class="keywordflow">if</span> ((c &amp; 0xfe)){ <span class="comment">//MMC returns something else than idle or busy signal</span>
00458     <a class="code" href="mmc_8c.html#a7">ConsoleDecipherMMCResponse</a>(c);
00459     <a class="code" href="board_8h.html#a29">MMC_XCS</a> = <a class="code" href="board_8h.html#a31">MMC_NOT_SELECTED</a>;
00460 
00461 <span class="preprocessor">#ifdef MMCDEBUG</span>