mmc_8c-source.html

MP3播放器源代码, VS1003B

00192   ConsolePutHex8(<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>[10]);
00193   ConsolePutHex8(<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>[11]);
00194   ConsolePutHex8(<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>[12]);
00195   ConsolePutHex8(<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>[13]);
00196 
00197   <span class="comment">//mediaSerialNumber[0] = diskSect.raw.buf[10];</span>
00198   <span class="comment">//mediaSerialNumber[1] = diskSect.raw.buf[11];</span>
00199   <span class="comment">//mediaSerialNumber[2] = diskSect.raw.buf[12];</span>
00200   <span class="comment">//mediaSerialNumber[3] = diskSect.raw.buf[13];</span>
00201 
00202   ConsolePutChar(<span class="charliteral">'\r'</span>);
00203   
00204   <span class="comment">/* print out card ident register</span>
00205 <span class="comment">  for (c=0; c&lt;30; c++){</span>
00206 <span class="comment">    if ((c&amp;0x03)==0) ConsolePutChar(' ');</span>
00207 <span class="comment">    ConsolePutHex8(diskSect.raw.buf[c]);</span>
00208 <span class="comment">  }</span>
00209 <span class="comment">  */</span>
00210 
00211   <span class="keywordflow">return</span> 0; <span class="comment">/* All OK return */</span>
00212 }
00213 
00214 
00215 
<a name="l00217"></a><a class="code" href="mmc_8c.html#a4">00217</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="mmc_8c.html#a4">RebootMMC</a>(){
00218   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c;
00219 
00220   <span class="comment">//Try (indefinitely) to switch on the MMC card</span>
00221   <span class="keywordflow">do</span>{
00222     <a class="code" href="board_8h.html#a50">SPI8Clocks</a>(8);      
00223     <span class="comment">/* MMC Don't use CRC - seems to be required by some MMC cards? */</span>
00224     <a class="code" href="mmc_8c.html#a0">MmcCommand</a>(0x7B,0,0,0,0);
00225     <span class="comment">/* MMC Init, command 0x40 should return 0x01 (idle) if all is ok. */</span>
00226   }<span class="keywordflow">while</span> (<a class="code" href="mmc_8c.html#a0">MmcCommand</a>(0x40,0,0,0,0)!=0x01);
00227   <span class="comment">// 0x01(idle) response detected.</span>
00228   
00229   ConsoleWrite(<span class="stringliteral">"Card found, starting... "</span>);
00230   <span class="comment">/*Try max 255 times MMC Wake-up call: set to Not Idle (mmc returns 0x00)*/</span>
00231   c=255;
00232   <span class="keywordflow">while</span> ((c--)&amp;&amp;(<a class="code" href="mmc_8c.html#a0">MmcCommand</a>(0x41,0,0,0,16))){
00233     <a class="code" href="board_8h.html#a51">Delay</a>(10);
00234     <span class="keywordflow">if</span> (c==1){
00235       <span class="comment">//timeout</span>
00236       ConsoleWrite(<span class="stringliteral">"Failed.\r"</span>);
00237       <span class="keywordflow">return</span> 2; <span class="comment">/* Not able to power up mmc */</span>
00238     }
00239   }
00240 
00241   ConsoleWrite(<span class="stringliteral">"Ok.\r"</span>);
00242   <span class="keywordflow">return</span> 0;
00243 }
00244 
00245 
<a name="l00246"></a><a class="code" href="mmc_8h.html#a1">00246</a> <a class="code" href="board_8h.html#a47">Public</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="mmc_8c.html#a5">InitMMC</a>(){
00247   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c;
00248 
00249   <span class="comment">//Switch off the MMC power supply</span>
00250   <a class="code" href="board_8h.html#a28">MMC_OFF</a> = <a class="code" href="board_8h.html#a26">YES</a>; 
00251 
00252   ConsoleWrite (<span class="stringliteral">"Init: MMC\r"</span>);
00253   <a class="code" href="board_8h.html#a51">Delay</a>(100);
00254 
00255   <span class="comment">//Switch on the MMC power supply</span>
00256   <a class="code" href="board_8h.html#a28">MMC_OFF</a> = <a class="code" href="board_8h.html#a27">NO</a>;
00257   <a class="code" href="board_8h.html#a51">Delay</a>(100);
00258 
00259   <a class="code" href="board_8h.html#a32">MMCSelect</a>();
00260   <span class="comment">/* Allow MMC some time and clock cycles to reset */</span>
00261   <span class="keywordflow">for</span> (c=0; c&lt;200; c++){    
00262     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00263     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00264   }
00265   <a class="code" href="board_8h.html#a51">Delay</a>(20);
00266 
00267   <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#a4">RebootMMC</a>()) <span class="keywordflow">return</span> 1; <span class="comment">//not able to powerup;</span>
00268   <span class="comment">//An existing MMC card should be able to respond now.</span>
00269 
00270   <a class="code" href="mmc_8c.html#a3">GetStorageInformation</a>();
00271   
00272   <span class="comment">/* Set Block Size of 512 bytes (2 == 512 &lt;&lt; 8) */</span>
00273   <span class="keywordflow">if</span> ((c=<a class="code" href="mmc_8c.html#a0">MmcCommand</a>(0x50,0,0,2,0))) <span class="keywordflow">return</span> c|0x80; <span class="comment">/* blocksize error */</span>
00274   
00275   <span class="comment">/* Check if MMC supports interrupted data transfer */</span>
00276   <span class="comment">/* This does a simple checksum check to see if interrupted and </span>
00277 <span class="comment">   * non-interrupted read blocks are the same. */</span>
00278   <span class="comment">/* This could be a function, so it is in braces for clarity purposes */</span>
00279   {  
00280     <span class="keywordflow">if</span> (<a class="code" href="mmc_8h.html#a2">SeekSector</a>(0)) <span class="keywordflow">return</span> 2; <span class="comment">//Storage powerup failure    </span>
00281     <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#a9">ReadPhysicalSector</a>()) <span class="keywordflow">return</span> 2; <span class="comment">//Storage powerup failure</span>
00282 
00283     <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</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>[511];
00284     <span class="keywordflow">for</span> (c=0; c&lt;250; c++){
00285       <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</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>[c];
00286     }
00287     
00288     <span class="keywordflow">if</span> (<a class="code" href="mmc_8h.html#a2">SeekSector</a>(0)) <span class="keywordflow">return</span> 2;<span class="comment">//Storage powerup failure</span>
00289     
00290     <span class="comment">/* Send some extra SPI clocks */</span>
00291     <a class="code" href="board_8h.html#a33">MMCDeselect</a>();
00292     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00293     <span class="keywordflow">for</span> (c=0; c&lt;100; c++){
00294       <a class="code" href="board_8h.html#a44">SPIPutChar</a>(0xff);
00295     }
00296     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00297     
00298     <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#a9">ReadPhysicalSector</a>()){
00299       ConsoleWrite(<span class="stringliteral">"Interrupted read failed.\r"</span>);
00300       ConsoleWrite(<span class="stringliteral">"Using compatibility mode.\r"</span>);
00301       <span class="keywordflow">return</span> 0x0e; <span class="comment">//ok but no support for seek-before-read</span>
00302       
00303     }<span class="keywordflow">else</span>{
00304       <span class="comment">//Check if received data was same</span>
00305       <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</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>[511];
00306       <span class="keywordflow">for</span> (c=0; c&lt;250; c++){
00307         <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</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>[c];
00308       }
00309     }
00310     
00311     <span class="keywordflow">if</span> (<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a>) { <span class="comment">/* Checksum does not match */</span>
00312       ConsoleWrite(<span class="stringliteral">"This MMC has no support for interrupted read. "</span>);
00313       ConsoleWrite(<span class="stringliteral">"Using compatibility mode.\r"</span>);
00314       <span class="keywordflow">return</span> 0x0e; <span class="comment">//ok but no support for seek-before-read</span>
00315     }
00316     
00317     ConsoleWrite(<span class="stringliteral">"\rInitMMC ok.\r"</span>);
00318   }
00319 
00320   <span class="comment">/* All OK return */</span>
00321   <span class="keywordflow">return</span> 0; <span class="comment">//ok and MMC supports seek-before-read</span>
00322 
00323 }
00324 
00325 
<a name="l00330"></a><a class="code" href="mmc_8c.html#a6">00330</a> <span class="keywordtype">void</span> <a class="code" href="mmc_8c.html#a6">PerformBlockRead</a>(){
00331 
00332 <span class="preprocessor">#ifdef MMCDEBUG</span>
00333 <span class="preprocessor"></span>  ConsoleWrite(<span class="stringliteral">"&lt;R"</span>); <span class="comment">//Actual Read</span>
00334 <span class="preprocessor">#endif</span>
00335 <span class="preprocessor"></span>
00336   <span class="comment">/* Use shared global buffer pointer for speed*/</span>
00337   <span class="comment">/* Loop unrolled 16 times for SPEED! :) */</span>
00338   <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>;
00339   <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){
00340     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00341     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00342     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00343     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00344     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00345     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00346     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00347     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00348     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00349     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00350     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00351     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00352     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00353     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00354     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00355     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00356     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00357     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00358     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00359     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00360     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00361     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00362     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00363     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00364     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00365     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00366     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00367     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00368     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00369     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00370     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00371     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00372     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00373     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00374     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00375     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;