mmc_8c.html

MP3 Player Source Code

00129   <span class="keywordflow">if</span> (c != 0xfe){
00130     <span class="comment">// No data start token, read fail. In an OS an error message would display.</span>
00131     <span class="comment">// Since we're in an embedded system, it's unclear what we should do now.</span>
00132     <span class="comment">// Current approach is to say all ok but make read block return 0xff's.</span>
00133     <span class="comment">// It's not disasterous at least as long as we don't WRITE to MMC.</span>
00134 
00135     <span class="comment">// Flush any data that might be pending from the MMC.</span>
00136 <span class="preprocessor">#ifdef MMCLONGDEBUG    </span>
00137 <span class="preprocessor"></span>    {
00138       <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
00139       ConsoleWrite(<span class="stringliteral">"\rMMCWaitForData failed. "</span>);
00140       ConsoleWrite(<span class="stringliteral">"Expected 0xFE token, received: "</span>);
00141       <span class="keywordflow">for</span> (i=0;i&lt;550;i++){
00142         ConsolePutHex8(c);
00143         c=<a class="code" href="board_8c.html#a1">SPIGetChar</a>();
00144       }
00145     }
00146 <span class="preprocessor">#else</span>
00147 <span class="preprocessor"></span>    <a class="code" href="board_8h.html#a48">SPI8Clocks</a>(200); <span class="comment">/* Flush MMC by sending lots of FF's to it */</span>
00148     <a class="code" href="board_8h.html#a48">SPI8Clocks</a>(200);
00149     <a class="code" href="board_8h.html#a48">SPI8Clocks</a>(200);
00150 <span class="preprocessor">#endif</span>
00151 <span class="preprocessor"></span>
00152     <a class="code" href="board_8h.html#a29">MMC_XCS</a> = <a class="code" href="board_8h.html#a31">MMC_NOT_SELECTED</a>; <span class="comment">//Drop MMC offline now.</span>
00153     DebugMessage(<span class="stringliteral">"!t&gt;"</span>);
00154     <span class="keywordflow">return</span> 5; <span class="comment">//Return error</span>
00155 
00156   }
00157 
00158   DebugMessage(<span class="stringliteral">"t&gt;"</span>); <span class="comment">//Exit Token Wait</span>
00159   <span class="keywordflow">return</span> 0;
00160 
00161 }
</div></pre>
<p>
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<a class="anchor" name="a6" doxytag="mmc.c::PerformBlockRead" ></a><p>
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          <td class="md" nowrap valign="top"> void PerformBlockRead           </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 the actual reading of 512 octets from MMC. 
<p>
Note: This is the fast routine to read complete disk block 
<p>
Definition at line <a class="el" href="mmc_8c-source.html#l00332">332</a> of file <a class="el" href="mmc_8c-source.html">mmc.c</a>.
<p>
References <a class="el" href="buffer_8h-source.html#l00107">DiskBlock::Raw::buf</a>, <a class="el" href="buffer_8c-source.html#l00013">dataBufPtr</a>, <a class="el" href="buffer_8c-source.html#l00010">diskSect</a>, <a class="el" href="unionDiskBlock.html#o1">DiskBlock::raw</a>, <a class="el" href="board_8h-source.html#l00223">SPI_RESULT_BYTE</a>, <a class="el" href="board_8h-source.html#l00220">SPIPutCharWithoutWaiting</a>, and <a class="el" href="board_8h-source.html#l00214">SPIWait</a>.
<p>
Referenced by <a class="el" href="mmc_8c-source.html#l00477">ReadPhysicalSector()</a>.
<p>
<pre class="fragment"><div>00332                        {
00333 
00334 <span class="preprocessor">#ifdef MMCDEBUG</span>
00335 <span class="preprocessor"></span>  ConsoleWrite(<span class="stringliteral">"&lt;R"</span>); <span class="comment">//Actual Read</span>
00336 <span class="preprocessor">#endif</span>
00337 <span class="preprocessor"></span>
00338   <span class="comment">/* Use shared global buffer pointer for speed*/</span>
00339   <span class="comment">/* Loop unrolled 16 times for SPEED! :) */</span>
00340   <a class="code" href="buffer_8c.html#a1">dataBufPtr</a> = <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>;
00341   <span class="keywordflow">while</span> (<a class="code" href="buffer_8c.html#a1">dataBufPtr</a> &lt; <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>+512){
00342     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00343     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00344     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00345     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00346     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00347     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00348     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00349     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00350     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00351     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00352     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00353     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00354     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00355     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00356     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00357     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00358     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00359     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00360     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00361     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00362     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00363     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00364     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00365     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00366     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00367     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00368     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00369     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00370     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00371     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00372     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00373     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00374     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00375     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00376     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00377     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00378     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00379     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00380     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00381     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00382     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00383     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00384     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00385     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00386     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00387     <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(0xff);
00388     <a class="code" href="board_8h.html#a41">SPIWait</a>();
00389     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a44">SPI_RESULT_BYTE</a>;
00390   }
00391 
00392 <span class="preprocessor">#ifdef MMCDEBUG</span>
00393 <span class="preprocessor"></span>    ConsoleWrite(<span class="stringliteral">"R&gt;"</span>);
00394 <span class="preprocessor">#endif</span>
00395 <span class="preprocessor"></span>
00396 }
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<a class="anchor" name="a9" doxytag="mmc.c::ReadPhysicalSector" ></a><p>
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          <td class="md" nowrap valign="top"> Public 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 }
</div></pre>
<p>
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