📄 mmc_8c-source.html
字号:
<a name="l00306"></a>00306 <a name="l00307"></a>00307 <a name="l00308"></a>00308 <span class="comment">/*--------------------------------------------------------------------------</span><a name="l00309"></a>00309 <span class="comment"></span><a name="l00310"></a>00310 <span class="comment"> Public Functions</span><a name="l00311"></a>00311 <span class="comment"></span><a name="l00312"></a>00312 <span class="comment">---------------------------------------------------------------------------*/</span><a name="l00313"></a>00313 <a name="l00314"></a>00314 <a name="l00315"></a>00315 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00316"></a>00316 <span class="comment">/* Initialize Disk Drive */</span><a name="l00317"></a>00317 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00318"></a>00318 <a name="l00319"></a><a class="code" href="mmc_8c.html#8e429a29bdbb73f5bc9e2ab2335a5112">00319</a> DSTATUS <a class="code" href="mmc_8c.html#8e429a29bdbb73f5bc9e2ab2335a5112">disk_initialize</a> (<a name="l00320"></a>00320 BYTE drv <span class="comment">/* Physical drive nmuber (0) */</span><a name="l00321"></a>00321 )<a name="l00322"></a>00322 {<a name="l00323"></a>00323 BYTE n, ty, ocr[4];<a name="l00324"></a>00324 <a name="l00325"></a>00325 <a class="code" href="mmc_8c.html#4f29b18133b2bf5eaa2f04587d3b1050">MMC_init</a> ();<a name="l00326"></a>00326 <a name="l00327"></a>00327 <span class="keywordflow">if</span> (drv) <span class="keywordflow">return</span> STA_NOINIT; <span class="comment">/* Supports only single drive */</span><a name="l00328"></a>00328 <span class="keywordflow">if</span> (Stat & STA_NODISK) <span class="keywordflow">return</span> Stat; <span class="comment">/* No card in the socket */</span><a name="l00329"></a>00329 <a name="l00330"></a>00330 <span class="preprocessor">#if 0</span><a name="l00331"></a>00331 <span class="preprocessor"></span> <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#f0d219bf523e1f70163e044c4cbc20af">MMC_cardPresent</a> ())<a name="l00332"></a>00332 {<a name="l00333"></a>00333 <a class="code" href="lcd_8c.html#745f4e24d600186db3dc2fea9b4a52d6">LCD_printf</a> (<span class="stringliteral">"Card present!\n"</span>);<a name="l00334"></a>00334 }<a name="l00335"></a>00335 <span class="keywordflow">else</span><a name="l00336"></a>00336 {<a name="l00337"></a>00337 <a class="code" href="lcd_8c.html#745f4e24d600186db3dc2fea9b4a52d6">LCD_printf</a> (<span class="stringliteral">"NO card!\n"</span>);<a name="l00338"></a>00338 }<a name="l00339"></a>00339 <span class="preprocessor">#endif</span><a name="l00340"></a>00340 <span class="preprocessor"></span> <span class="comment">//power_on(); /* Force socket power on */</span><a name="l00341"></a>00341 <span class="keywordflow">for</span> (n = 10; n; n--) rcvr_spi(); <span class="comment">/* 80 dummy clocks */</span><a name="l00342"></a>00342 <a name="l00343"></a>00343 <a class="code" href="mmc_8c.html#56e8d2ffde94d0c5fdf14b772a32a77f">SELECT</a>(); <span class="comment">/* CS = L */</span><a name="l00344"></a>00344 ty = 0;<a name="l00345"></a>00345 <span class="keywordflow">if</span> (send_cmd(<a class="code" href="mmc_8c.html#938c1466755f12fb04ac0d1b775584d1">CMD0</a>, 0) == 1) { <span class="comment">/* Enter Idle state */</span><a name="l00346"></a>00346 Timer1 = 100; <span class="comment">/* Initialization timeout of 1000 msec */</span><a name="l00347"></a>00347 <span class="keywordflow">if</span> (send_cmd(<a class="code" href="mmc_8c.html#c75b3e0ad1fb013ea946fb49bbe65668">CMD8</a>, 0x1AA) == 1) { <span class="comment">/* SDC Ver2+ */</span><a name="l00348"></a>00348 <span class="comment">//LCD_printf ("SDC Ver2+\n");</span><a name="l00349"></a>00349 <span class="keywordflow">for</span> (n = 0; n < 4; n++) ocr[n] = rcvr_spi();<a name="l00350"></a>00350 <span class="keywordflow">if</span> (ocr[2] == 0x01 && ocr[3] == 0xAA) { <span class="comment">/* The card can work at vdd range of 2.7-3.6V */</span><a name="l00351"></a>00351 <span class="keywordflow">do</span> {<a name="l00352"></a>00352 <span class="keywordflow">if</span> (send_cmd(<a class="code" href="mmc_8c.html#78289a7a85ffcfddd626694105dc0780">CMD55</a>, 0) <= 1 && send_cmd(<a class="code" href="mmc_8c.html#3ca1450d0ac55d2705aab03537bf2865">CMD41</a>, 1UL << 30) == 0) <span class="keywordflow">break</span>; <span class="comment">/* ACMD41 with HCS bit */</span><a name="l00353"></a>00353 } <span class="keywordflow">while</span> (Timer1);<a name="l00354"></a>00354 <span class="keywordflow">if</span> (Timer1 && send_cmd(<a class="code" href="mmc_8c.html#a7a26b2cf17e1ff5967820a1fa41a7aa">CMD58</a>, 0) == 0) { <span class="comment">/* Check CCS bit */</span><a name="l00355"></a>00355 <span class="keywordflow">for</span> (n = 0; n < 4; n++) ocr[n] = rcvr_spi();<a name="l00356"></a>00356 ty = (ocr[0] & 0x40) ? 6 : 2;<a name="l00357"></a>00357 }<a name="l00358"></a>00358 }<a name="l00359"></a>00359 } <span class="keywordflow">else</span> { <span class="comment">/* SDC Ver1 or MMC */</span><a name="l00360"></a>00360 <span class="comment">//LCD_printf ("SDC Ver1 or MMC\n");</span><a name="l00361"></a>00361 ty = (send_cmd(<a class="code" href="mmc_8c.html#78289a7a85ffcfddd626694105dc0780">CMD55</a>, 0) <= 1 && send_cmd(<a class="code" href="mmc_8c.html#3ca1450d0ac55d2705aab03537bf2865">CMD41</a>, 0) <= 1) ? 2 : 1; <span class="comment">/* SDC : MMC */</span><a name="l00362"></a>00362 <span class="keywordflow">do</span> {<a name="l00363"></a>00363 <span class="keywordflow">if</span> (ty == 2) {<a name="l00364"></a>00364 <span class="keywordflow">if</span> (send_cmd(<a class="code" href="mmc_8c.html#78289a7a85ffcfddd626694105dc0780">CMD55</a>, 0) <= 1 && send_cmd(<a class="code" href="mmc_8c.html#3ca1450d0ac55d2705aab03537bf2865">CMD41</a>, 0) == 0) <span class="keywordflow">break</span>; <span class="comment">/* ACMD41 */</span><a name="l00365"></a>00365 } <span class="keywordflow">else</span> {<a name="l00366"></a>00366 <span class="keywordflow">if</span> (send_cmd(<a class="code" href="mmc_8c.html#ca9979f299fa78c1128d778084478673">CMD1</a>, 0) == 0) <span class="keywordflow">break</span>; <span class="comment">/* CMD1 */</span><a name="l00367"></a>00367 }<a name="l00368"></a>00368 } <span class="keywordflow">while</span> (Timer1);<a name="l00369"></a>00369 <span class="keywordflow">if</span> (!Timer1 || send_cmd(<a class="code" href="mmc_8c.html#aeab261b94f2031ba41a1d4d857c3541">CMD16</a>, 512) != 0) <span class="comment">/* Select R/W block length */</span><a name="l00370"></a>00370 ty = 0;<a name="l00371"></a>00371 }<a name="l00372"></a>00372 }<a name="l00373"></a>00373 CardType = ty;<a name="l00374"></a>00374 <a class="code" href="mmc_8c.html#1cbd972fc333e07d29999e284020c362">DESELECT</a>(); <span class="comment">/* CS = H */</span><a name="l00375"></a>00375 rcvr_spi(); <span class="comment">/* Idle (Release DO) */</span><a name="l00376"></a>00376 <a name="l00377"></a>00377 <span class="keywordflow">if</span> (ty) { <span class="comment">/* Initialization succeded */</span><a name="l00378"></a>00378 Stat &= ~STA_NOINIT; <span class="comment">/* Clear STA_NOINIT */</span><a name="l00379"></a>00379 } <span class="keywordflow">else</span> { <span class="comment">/* Initialization failed */</span><a name="l00380"></a>00380 <span class="comment">//power_off();</span><a name="l00381"></a>00381 }<a name="l00382"></a>00382 <a name="l00383"></a>00383 <span class="keywordflow">return</span> Stat;<a name="l00384"></a>00384 }<a name="l00385"></a>00385 <a name="l00386"></a>00386 <a name="l00387"></a>00387 <a name="l00388"></a>00388 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00389"></a>00389 <span class="comment">/* Get Disk Status */</span><a name="l00390"></a>00390 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00391"></a>00391 <a name="l00392"></a><a class="code" href="mmc_8c.html#21ad8e9a107ea2000705a3edfebaaa2d">00392</a> DSTATUS <a class="code" href="mmc_8c.html#21ad8e9a107ea2000705a3edfebaaa2d">disk_status</a> (<a name="l00393"></a>00393 BYTE drv <span class="comment">/* Drive number (0) */</span><a name="l00394"></a>00394 )<a name="l00395"></a>00395 {<a name="l00396"></a>00396 <span class="keywordflow">return</span> (drv) ? STA_NODISK : Stat;<a name="l00397"></a>00397 }<a name="l00398"></a>00398 <a name="l00399"></a>00399 <a name="l00400"></a>00400 <a name="l00401"></a>00401 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00402"></a>00402 <span class="comment">/* Read Sector(s) */</span><a name="l00403"></a>00403 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00404"></a>00404 <a name="l00405"></a><a class="code" href="mmc_8c.html#42043c0f462756dbdf1f3bd1bdb5fa50">00405</a> DRESULT <a class="code" href="mmc_8c.html#42043c0f462756dbdf1f3bd1bdb5fa50">disk_read</a> (<a name="l00406"></a>00406 BYTE drv, <span class="comment">/* Physical drive nmuber (0) */</span><a name="l00407"></a>00407 BYTE *buff, <span class="comment">/* Pointer to the data buffer to store read data */</span><a name="l00408"></a>00408 DWORD sector, <span class="comment">/* Start sector number (LBA) */</span><a name="l00409"></a>00409 BYTE count <span class="comment">/* Sector count (1..255) */</span><a name="l00410"></a>00410 )<a name="l00411"></a>00411 {<a name="l00412"></a>00412 <span class="keywordflow">if</span> (drv || !count) <span class="keywordflow">return</span> RES_PARERR;<a name="l00413"></a>00413 <span class="keywordflow">if</span> (Stat & STA_NOINIT) <span class="keywordflow">return</span> RES_NOTRDY;<a name="l00414"></a>00414 <a name="l00415"></a>00415 <span class="keywordflow">if</span> (!(CardType & 4)) sector *= 512; <span class="comment">/* Convert to byte address if needed */</span><a name="l00416"></a>00416 <a name="l00417"></a>00417 <a class="code" href="mmc_8c.html#56e8d2ffde94d0c5fdf14b772a32a77f">SELECT</a>(); <span class="comment">/* CS = L */</span><a name="l00418"></a>00418 <a name="l00419"></a>00419 <span class="keywordflow">if</span> (count == 1) { <span class="comment">/* Single block read */</span><a name="l00420"></a>00420 <span class="keywordflow">if</span> ((send_cmd(<a class="code" href="mmc_8c.html#6bbfe7dc16a19b7f40efcf554b5666ad">CMD17</a>, sector) == 0) <span class="comment">/* READ_SINGLE_BLOCK */</span><a name="l00421"></a>00421 && rcvr_datablock(buff, 512))<a name="l00422"></a>00422 count = 0;<a name="l00423"></a>00423 }<a name="l00424"></a>00424 <span class="keywordflow">else</span> { <span class="comment">/* Multiple block read */</span><a name="l00425"></a>00425 <span class="keywordflow">if</span> (send_cmd(<a class="code" href="mmc_8c.html#3d32c27a6be061b865ba539127278f14">CMD18</a>, sector) == 0) { <span class="comment">/* READ_MULTIPLE_BLOCK */</span><a name="l00426"></a>00426 <span class="keywordflow">do</span> {<a name="l00427"></a>00427 <span class="keywordflow">if</span> (!rcvr_datablock(buff, 512)) <span class="keywordflow">break</span>;<a name="l00428"></a>00428 buff += 512;<a name="l00429"></a>00429 } <span class="keywordflow">while</span> (--count);<a name="l00430"></a>00430 send_cmd(<a class="code" href="mmc_8c.html#8d6283c9b060afbaa0e6d1ff7e5ea7b8">CMD12</a>, 0); <span class="comment">/* STOP_TRANSMISSION */</span><a name="l00431"></a>00431 }<a name="l00432"></a>00432 }<a name="l00433"></a>00433 <a name="l00434"></a>00434 <a class="code" href="mmc_8c.html#1cbd972fc333e07d29999e284020c362">DESELECT</a>(); <span class="comment">/* CS = H */</span><a name="l00435"></a>00435 rcvr_spi(); <span class="comment">/* Idle (Release DO) */</span><a name="l00436"></a>00436 <a name="l00437"></a>00437 <span class="keywordflow">return</span> count ? RES_ERROR : RES_OK;<a name="l00438"></a>00438 }<a name="l00439"></a>00439 <a name="l00440"></a>00440 <a name="l00441"></a>00441 <a name="l00442"></a>00442 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00443"></a>00443 <span class="comment">/* Write Sector(s) */</span><a name="l00444"></a>00444 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00445"></a>00445 <a name="l00446"></a>00446 <span class="preprocessor">#if _READONLY == 0</span><a name="l00447"></a><a class="code" href="mmc_8c.html#0045ef2f87f7c45d77bcdef38eae7b67">00447</a> <span class="preprocessor"></span>DRESULT <a class="code" href="mmc_8c.html#0045ef2f87f7c45d77bcdef38eae7b67">disk_write</a> (<a name="l00448"></a>00448 BYTE drv, <span class="comment">/* Physical drive nmuber (0) */</span><a name="l00449"></a>00449 <span class="keyword">const</span> BYTE *buff, <span class="comment">/* Pointer to the data to be written */</span><a name="l00450"></a>00450 DWORD sector, <span class="comment">/* Start sector number (LBA) */</span><a name="l00451"></a>00451 BYTE count <span class="comment">/* Sector count (1..255) */</span><a name="l00452"></a>00452 )<a name="l00453"></a>00453 {<a name="l00454"></a>00454 <span class="keywordflow">if</span> (drv || !count) <span class="keywordflow">return</span> RES_PARERR;<a name="l00455"></a>00455 <span class="keywordflow">if</span> (Stat & STA_NOINIT) <span class="keywordflow">return</span> RES_NOTRDY;<a name="l00456"></a>00456 <span class="keywordflow">if</span> (Stat & STA_PROTECT) <span class="keywordflow">return</span> RES_WRPRT;<a name="l00457"></a>00457 <a name="l00458"></a>00458 <span class="keywordflow">if</span> (!(CardType & 4)) sector *= 512; <span class="comment">/* Convert to byte address if needed */</span><a name="l00459"></a>00459 <a name="l00460"></a>00460 <a class="code" href="mmc_8c.html#56e8d2ffde94d0c5fdf14b772a32a77f">SELECT</a>(); <span class="comment">/* CS = L */</span><a name="l00461"></a>00461 <a name="l00462"></a>00462 <span class="keywordflow">if</span> (count == 1) { <span class="comment">/* Single block write */</span><a name="l00463"></a>00463 <span class="keywordflow">if</span> ((send_cmd(<a class="code" href="mmc_8c.html#252300302c6f7960df547a7f5c25be85">CMD24</a>, sector) == 0) <span class="comment">/* WRITE_BLOCK */</span><a name="l00464"></a>00464 && xmit_datablock(buff, 0xFE))⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -