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   1 /*
   2  * Copyright © 2013 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 #include "ao.h"
  19 #include "ao_sdcard.h"
  20
  21 extern uint8_t ao_radio_mutex;
  22
  23 #define ao_sdcard_get_slow() do { ao_mutex_get(&ao_radio_mutex); ao_spi_get(AO_SDCARD_SPI_BUS, AO_SPI_SPEED_250kHz); } while (0)
  24 #define ao_sdcard_get() do { ao_mutex_get(&ao_radio_mutex); ao_spi_get(AO_SDCARD_SPI_BUS, AO_SPI_SPEED_FAST); } while (0)
  25 #define ao_sdcard_put() do { ao_spi_put(AO_SDCARD_SPI_BUS); ao_mutex_put(&ao_radio_mutex); } while (0)
  26 #define ao_sdcard_send_fixed(d,l)       ao_spi_send_fixed((d), (l), AO_SDCARD_SPI_BUS)
  27 #define ao_sdcard_send(d,l)             ao_spi_send((d), (l), AO_SDCARD_SPI_BUS)
  28 #define ao_sdcard_recv(d,l)             ao_spi_recv((d), (l), AO_SDCARD_SPI_BUS)
  29 #define ao_sdcard_select()              ao_gpio_set(AO_SDCARD_SPI_CS_PORT,AO_SDCARD_SPI_CS_PIN,AO_SDCARD_SPI_CS,0)
  30 #define ao_sdcard_deselect()            ao_gpio_set(AO_SDCARD_SPI_CS_PORT,AO_SDCARD_SPI_CS_PIN,AO_SDCARD_SPI_CS,1)
  31
  32 /* Include SD card commands */
  33 #define SDCARD_DEBUG    1
  34
  35 /* Spew SD tracing */
  36 #define SDCARD_TRACE    0
  37
  38 /* Emit error and warning messages */
  39 #define SDCARD_WARN     0
  40
  41 static uint8_t  initialized;
  42 static uint8_t  present;
  43 static uint8_t  mutex;
  44 static enum ao_sdtype sdtype;
  45
  46 #define ao_sdcard_lock()        ao_mutex_get(&mutex)
  47 #define ao_sdcard_unlock()      ao_mutex_put(&mutex)
  48
  49 #if SDCARD_TRACE
  50 #define DBG(...) printf(__VA_ARGS__)
  51 #else
  52 #define DBG(...)
  53 #endif
  54
  55 #if SDCARD_WARN
  56 #define WARN(...) printf(__VA_ARGS__)
  57 #else
  58 #define WARN(...)
  59 #endif
  60
  61 #define later(x,y)      ((int16_t) ((x) - (y)) >= 0)
  62
  63 /*
  64  * Wait while the card is busy. The card will return a stream of 0xff
  65  * when it is ready to accept a command
  66  */
  67
  68 static uint8_t
  69 ao_sdcard_wait_busy(void)
  70 {
  71         uint16_t        timeout = ao_time() + SDCARD_BUSY_TIMEOUT;
  72         uint8_t         reply;
  73         for (;;) {
  74                 ao_sdcard_recv(&reply, 1);
  75                 DBG("\t\twait busy %02x\n", reply);
  76                 if (reply == 0xff)
  77                         break;
  78                 if (later(ao_time(), timeout)) {
  79                         WARN("wait busy timeout\n");
  80                         return 0;
  81                 }
  82         }
  83         return 1;
  84 }
  85
  86
  87 /*
  88  * Send an SD command and await the status reply
  89  */
  90
  91 static uint8_t
  92 ao_sdcard_send_cmd(uint8_t cmd, uint32_t arg)
  93 {
  94         uint8_t data[6];
  95         uint8_t reply;
  96         int i;
  97         uint16_t timeout;
  98
  99         DBG ("\tsend_cmd %d arg %08x\n", cmd, arg);
 100
 101         /* Wait for the card to not be busy */
 102         if (cmd != SDCARD_GO_IDLE_STATE) {
 103                 if (!ao_sdcard_wait_busy())
 104                         return SDCARD_STATUS_TIMEOUT;
 105         }
 106
 107         data[0] = cmd & 0x3f | 0x40;
 108         data[1] = arg >> 24;
 109         data[2] = arg >> 16;
 110         data[3] = arg >> 8;
 111         data[4] = arg;
 112         if (cmd == SDCARD_GO_IDLE_STATE)
 113                 data[5] = 0x95; /* Valid for 0 arg */
 114         else if (cmd == SDCARD_SEND_IF_COND)
 115                 data[5] = 0x87; /* Valid for 0x1aa arg */
 116         else
 117                 data[5] = 0xff; /* no CRC */
 118         ao_sdcard_send(data, 6);
 119
 120         /* The first reply byte will be the status,
 121          * which must have the high bit clear
 122          */
 123         timeout = ao_time() + SDCARD_CMD_TIMEOUT;
 124         for (;;) {
 125                 ao_sdcard_recv(&reply, 1);
 126                 DBG ("\t\tgot byte %02x\n", reply);
 127                 if ((reply & 0x80) == 0)
 128                         break;
 129                 if (later(ao_time(), timeout)) {
 130                         WARN("send_cmd %02x timeout\n", cmd);
 131                         return SDCARD_STATUS_TIMEOUT;
 132                 }
 133         }
 134 #if SDCARD_WARN
 135         if (reply != SDCARD_STATUS_READY_STATE && reply != SDCARD_STATUS_IDLE_STATE)
 136                 WARN("send_cmd %d failed %02x\n", cmd, reply);
 137 #endif
 138         return reply;
 139 }
 140
 141 /*
 142  * Retrieve any reply, discarding the trailing CRC byte
 143  */
 144 static void
 145 ao_sdcard_recv_reply(uint8_t *reply, int len)
 146 {
 147         uint8_t discard;
 148
 149         if (len)
 150                 ao_sdcard_recv(reply, len);
 151         /* trailing byte */
 152         ao_sdcard_recv(&discard, 1);
 153 }
 154
 155 /*
 156  * Switch to 'idle' state. This is used to get the card into SPI mode
 157  */
 158 static uint8_t
 159 ao_sdcard_go_idle_state(void)
 160 {
 161         uint8_t ret;
 162
 163         DBG ("go_idle_state\n");
 164         ao_sdcard_select();
 165         ret = ao_sdcard_send_cmd(SDCARD_GO_IDLE_STATE, 0);
 166         ao_sdcard_recv_reply(NULL, 0);
 167         ao_sdcard_deselect();
 168         DBG ("\tgo_idle_state status %02x\n", ret);
 169         return ret;
 170 }
 171
 172 static uint8_t
 173 ao_sdcard_send_op_cond(void)
 174 {
 175         uint8_t ret;
 176
 177         DBG ("send_op_cond\n");
 178         ao_sdcard_select();
 179         ret = ao_sdcard_send_cmd(SDCARD_SEND_OP_COND, 0);
 180         ao_sdcard_recv_reply(NULL, 0);
 181         ao_sdcard_deselect();
 182         DBG ("\tsend_op_cond %02x\n", ret);
 183         return ret;
 184 }
 185
 186 static uint8_t
 187 ao_sdcard_send_if_cond(uint32_t arg, uint8_t send_if_cond_response[4])
 188 {
 189         uint8_t ret;
 190
 191         DBG ("send_if_cond\n");
 192         ao_sdcard_select();
 193         ret = ao_sdcard_send_cmd(SDCARD_SEND_IF_COND, arg);
 194         if (ret != SDCARD_STATUS_IDLE_STATE) {
 195                 DBG ("\tsend_if_cond failed %02x\n", ret);
 196                 return ret;
 197         }
 198         ao_sdcard_recv_reply(send_if_cond_response, 4);
 199         DBG ("send_if_cond status %02x response %02x %02x %02x %02x\n",
 200                 ret,
 201                 send_if_cond_response[0],
 202                 send_if_cond_response[1],
 203                 send_if_cond_response[2],
 204                 send_if_cond_response[3]);
 205         ao_sdcard_deselect();
 206         return ret;
 207 }
 208
 209 /*
 210  * _ao_sdcard_send_status
 211  *
 212  * Get the 2-byte status value.
 213  *
 214  * Called from other functions with CS held low already,
 215  * hence prefixing the name with '_'
 216  */
 217 static uint16_t
 218 _ao_sdcard_send_status(void)
 219 {
 220         uint8_t ret;
 221         uint8_t extra;
 222
 223         DBG ("send_status\n");
 224         ret = ao_sdcard_send_cmd(SDCARD_SEND_STATUS, 0);
 225         ao_sdcard_recv_reply(&extra, 1);
 226         if (ret != SDCARD_STATUS_READY_STATE)
 227                 DBG ("\tsend_if_cond failed %02x\n", ret);
 228         return ret | (extra << 8);
 229 }
 230
 231 /*
 232  * ao_sdcard_set_blocklen
 233  *
 234  * Set the block length for future read and write commands
 235  */
 236 static uint8_t
 237 ao_sdcard_set_blocklen(uint32_t blocklen)
 238 {
 239         uint8_t ret;
 240
 241         DBG ("set_blocklen %d\n", blocklen);
 242         ao_sdcard_select();
 243         ret = ao_sdcard_send_cmd(SDCARD_SET_BLOCKLEN, blocklen);
 244         ao_sdcard_recv_reply(NULL, 0);
 245         ao_sdcard_deselect();
 246         if (ret != SDCARD_STATUS_READY_STATE)
 247                 DBG ("\tsend_if_cond failed %02x\n", ret);
 248         return ret;
 249 }
 250
 251 /*
 252  * _ao_sdcard_app_cmd
 253  *
 254  * Send the app command prefix
 255  *
 256  * Called with the CS held low, hence
 257  * the '_' prefix
 258  */
 259 static uint8_t
 260 _ao_sdcard_app_cmd(void)
 261 {
 262         uint8_t ret;
 263
 264         DBG ("app_cmd\n");
 265         ret = ao_sdcard_send_cmd(SDCARD_APP_CMD, 0);
 266         ao_sdcard_recv_reply(NULL, 0);
 267         DBG ("\tapp_cmd status %02x\n");
 268         return ret;
 269 }
 270
 271 static uint8_t
 272 ao_sdcard_app_send_op_cond(uint32_t arg)
 273 {
 274         uint8_t ret;
 275
 276         DBG("send_op_comd\n");
 277         ao_sdcard_select();
 278         ret = _ao_sdcard_app_cmd();
 279         if (ret != SDCARD_STATUS_IDLE_STATE)
 280                 goto bail;
 281         ret = ao_sdcard_send_cmd(SDCARD_APP_SEND_OP_COMD, arg);
 282         ao_sdcard_recv_reply(NULL, 0);
 283 bail:
 284         ao_sdcard_deselect();
 285         DBG ("\tapp_send_op_cond status %02x\n", ret);
 286         return ret;
 287 }
 288
 289 static uint8_t
 290 ao_sdcard_read_ocr(uint8_t read_ocr_response[4])
 291 {
 292         uint8_t ret;
 293
 294         DBG ("read_ocr\n");
 295         ao_sdcard_select();
 296         ret = ao_sdcard_send_cmd(SDCARD_READ_OCR, 0);
 297         if (ret != SDCARD_STATUS_READY_STATE)
 298                 DBG ("\tread_ocr failed %02x\n", ret);
 299         else {
 300                 ao_sdcard_recv_reply(read_ocr_response, 4);
 301                 DBG ("\tread_ocr status %02x response %02x %02x %02x %02x\n", ret,
 302                         read_ocr_response[0], read_ocr_response[1],
 303                         read_ocr_response[2], read_ocr_response[3]);
 304         }
 305         ao_sdcard_deselect();
 306         return ret;
 307 }
 308
 309 /*
 310  * Follow the flow-chart defined by the SD group to
 311  * initialize the card and figure out what kind it is
 312  */
 313 static void
 314 ao_sdcard_setup(void)
 315 {
 316         int     i;
 317         uint8_t ret;
 318         uint8_t response[10];
 319
 320         DBG ("Testing sdcard\n");
 321
 322         ao_sdcard_get_slow();
 323         /*
 324          * min 74 clocks with CS high
 325          */
 326         ao_sdcard_send_fixed(0xff, 10);
 327
 328         /* Reset the card and get it into SPI mode */
 329         for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
 330                 if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE)
 331                         break;
 332         }
 333         if (i == SDCARD_IDLE_WAIT)
 334                 goto bail;
 335
 336         /* Figure out what kind of card we have */
 337         sdtype = ao_sdtype_unknown;
 338
 339         if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) {
 340                 uint32_t        arg = 0;
 341                 uint8_t         sdver2 = 0;
 342
 343                 /* Check for SD version 2 */
 344                 if ((response[2] & 0xf) == 1 && response[3] == 0xaa) {
 345                         arg = 0x40000000;
 346                         sdver2 = 1;
 347                 }
 348
 349                 for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
 350                         ret = ao_sdcard_app_send_op_cond(arg);
 351                         if (ret != SDCARD_STATUS_IDLE_STATE)
 352                                 break;
 353                 }
 354                 if (ret != SDCARD_STATUS_READY_STATE) {
 355                         /* MMC */
 356                         for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
 357                                 ret = ao_sdcard_send_op_cond();
 358                                 if (ret != SDCARD_STATUS_IDLE_STATE)
 359                                         break;
 360                         }
 361                         if (ret != SDCARD_STATUS_READY_STATE)
 362                                 goto bail;
 363                         sdtype = ao_sdtype_mmc3;
 364                 } else {
 365                         /* SD */
 366                         if (sdver2 != 0) {
 367                                 ret = ao_sdcard_read_ocr(response);
 368                                 if (ret != SDCARD_STATUS_READY_STATE)
 369                                         goto bail;
 370                                 if ((response[0] & 0xc0) == 0xc0)
 371                                         sdtype = ao_sdtype_sd2block;
 372                                 else
 373                                         sdtype = ao_sdtype_sd2byte;
 374                         } else {
 375                                 sdtype = ao_sdtype_sd1;
 376                         }
 377                 }
 378
 379                 /* For everything but SDHC cards, set the block length */
 380                 if (sdtype != ao_sdtype_sd2block) {
 381                         ret = ao_sdcard_set_blocklen(512);
 382                         if (ret != SDCARD_STATUS_READY_STATE)
 383                                 DBG ("set_blocklen failed, ignoring\n");
 384                 }
 385         }
 386
 387         DBG ("SD card detected, type %d\n", sdtype);
 388 bail:
 389         ao_sdcard_put();
 390 }
 391
 392 static uint8_t
 393 _ao_sdcard_reset(void)
 394 {
 395         int i;
 396         uint8_t ret;
 397         uint8_t response[10];
 398
 399         for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
 400                 if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE)
 401                         break;
 402         }
 403         if (i == SDCARD_IDLE_WAIT) {
 404                 ret = 0x3f;
 405                 goto bail;
 406         }
 407
 408         /* Follow the setup path to get the card out of idle state and
 409          * up and running again
 410          */
 411         if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) {
 412                 uint32_t        arg = 0;
 413                 uint8_t         sdver2 = 0;
 414
 415                 /* Check for SD version 2 */
 416                 if ((response[2] & 0xf) == 1 && response[3] == 0xaa) {
 417                         arg = 0x40000000;
 418                         sdver2 = 1;
 419                 }
 420
 421                 for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
 422                         ret = ao_sdcard_app_send_op_cond(arg);
 423                         if (ret != SDCARD_STATUS_IDLE_STATE)
 424                                 break;
 425                 }
 426
 427                 if (ret != SDCARD_STATUS_READY_STATE) {
 428                         /* MMC */
 429                         for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
 430                                 ret = ao_sdcard_send_op_cond();
 431                                 if (ret != SDCARD_STATUS_IDLE_STATE)
 432                                         break;
 433                         }
 434                         if (ret != SDCARD_STATUS_READY_STATE)
 435                                 goto bail;
 436                 }
 437
 438                 /* For everything but SDHC cards, set the block length */
 439                 if (sdtype != ao_sdtype_sd2block) {
 440                         ret = ao_sdcard_set_blocklen(512);
 441                         if (ret != SDCARD_STATUS_READY_STATE)
 442                                 DBG ("set_blocklen failed, ignoring\n");
 443                 }
 444         }
 445 bail:
 446         return ret;
 447 }
 448
 449 /*
 450  * The card will send 0xff until it is ready to send
 451  * the data block at which point it will send the START_BLOCK
 452  * marker followed by the data. This function waits while
 453  * the card is sending 0xff
 454  */
 455 static uint8_t
 456 ao_sdcard_wait_block_start(void)
 457 {
 458         uint8_t         v;
 459         uint16_t        timeout = ao_time() + SDCARD_BLOCK_TIMEOUT;
 460
 461         DBG ("\twait_block_start\n");
 462         for (;;) {
 463                 ao_sdcard_recv(&v, 1);
 464                 DBG("\t\trecv %02x\n", v);
 465                 if (v != 0xff)
 466                         break;
 467                 if (later(ao_time(), timeout)) {
 468                         printf ("wait block start timeout\n");
 469                         return 0xff;
 470                 }
 471         }
 472         return v;
 473 }
 474
 475 /*
 476  * Read a block of 512 bytes from the card
 477  */
 478 uint8_t
 479 ao_sdcard_read_block(uint32_t block, uint8_t *data)
 480 {
 481         uint8_t ret;
 482         uint8_t start_block;
 483         uint8_t crc[2];
 484         int tries;
 485
 486         ao_sdcard_lock();
 487         if (!initialized) {
 488                 ao_sdcard_setup();
 489                 initialized = 1;
 490                 if (sdtype != ao_sdtype_unknown)
 491                         present = 1;
 492         }
 493         if (!present) {
 494                 ao_sdcard_unlock();
 495                 return 0;
 496         }
 497         DBG("read block %d\n", block);
 498         if (sdtype != ao_sdtype_sd2block)
 499                 block <<= 9;
 500
 501         ao_sdcard_get();
 502         for (tries = 0; tries < 10; tries++) {
 503                 ao_sdcard_select();
 504
 505                 ret = ao_sdcard_send_cmd(SDCARD_READ_BLOCK, block);
 506                 ao_sdcard_recv_reply(NULL, 0);
 507                 if (ret != SDCARD_STATUS_READY_STATE) {
 508                         uint16_t        status;
 509                         WARN ("read block command failed %d status %02x\n", block, ret);
 510                         status = _ao_sdcard_send_status();
 511                         WARN ("\tstatus now %04x\n", status);
 512                         goto bail;
 513                 }
 514
 515                 ao_sdcard_send_fixed(0xff, 1);
 516
 517                 /* Wait for the data start block marker */
 518                 start_block = ao_sdcard_wait_block_start();
 519                 if (start_block != SDCARD_DATA_START_BLOCK) {
 520                         WARN ("wait block start failed %02x\n", start_block);
 521                         ret = 0x3f;
 522                         goto bail;
 523                 }
 524
 525                 ao_sdcard_recv(data, 512);
 526                 ao_sdcard_recv(crc, 2);
 527         bail:
 528                 ao_sdcard_deselect();
 529                 if (ret == SDCARD_STATUS_READY_STATE)
 530                         break;
 531                 if (ret == SDCARD_STATUS_IDLE_STATE) {
 532                         ret = _ao_sdcard_reset();
 533                         if (ret != SDCARD_STATUS_READY_STATE)
 534                                 break;
 535                 }
 536         }
 537         ao_sdcard_put();
 538         ao_sdcard_unlock();
 539
 540 #if SDCARD_WARN
 541         if (ret != SDCARD_STATUS_READY_STATE)
 542                 WARN("read failed\n");
 543         else if (tries)
 544                 WARN("took %d tries to read %d\n", tries + 1, block);
 545 #endif
 546
 547         DBG("read %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure");
 548         return ret == SDCARD_STATUS_READY_STATE;
 549 }
 550
 551 /*
 552  * Write a block of 512 bytes to the card
 553  */
 554 uint8_t
 555 ao_sdcard_write_block(uint32_t block, uint8_t *data)
 556 {
 557         uint8_t ret;
 558         uint8_t response[1];
 559         uint8_t start_block[8];
 560         uint16_t status;
 561         static uint8_t  check_data[512];
 562         int     i;
 563         int     tries;
 564
 565         ao_sdcard_lock();
 566         if (!initialized) {
 567                 ao_sdcard_setup();
 568                 initialized = 1;
 569                 if (sdtype != ao_sdtype_unknown)
 570                         present = 1;
 571         }
 572         if (!present) {
 573                 ao_sdcard_unlock();
 574                 return 0;
 575         }
 576         DBG("write block %d\n", block);
 577         if (sdtype != ao_sdtype_sd2block)
 578                 block <<= 9;
 579
 580         ao_sdcard_get();
 581
 582         for (tries = 0; tries < 10; tries++) {
 583                 ao_sdcard_select();
 584
 585                 ret = ao_sdcard_send_cmd(SDCARD_WRITE_BLOCK, block);
 586                 ao_sdcard_recv_reply(NULL, 0);
 587                 if (ret != SDCARD_STATUS_READY_STATE)
 588                         goto bail;
 589
 590                 /* Write a pad byte followed by the data start block marker */
 591                 start_block[0] = 0xff;
 592                 start_block[1] = SDCARD_DATA_START_BLOCK;
 593                 ao_sdcard_send(start_block, 2);
 594
 595                 /* Send the data */
 596                 ao_sdcard_send(data, 512);
 597
 598                 /* Fake the CRC */
 599                 ao_sdcard_send_fixed(0xff, 2);
 600
 601                 /* See if the card liked the data */
 602                 ao_sdcard_recv(response, sizeof (response));
 603                 if ((response[0] & SDCARD_DATA_RES_MASK) != SDCARD_DATA_RES_ACCEPTED) {
 604                         int i;
 605                         WARN("Data not accepted, response");
 606                         for (i = 0; i < sizeof (response); i++)
 607                                 WARN(" %02x", response[i]);
 608                         WARN("\n");
 609                         ret = 0x3f;
 610                         goto bail;
 611                 }
 612
 613                 /* Wait for the bus to go idle (should be done with an interrupt?) */
 614                 if (!ao_sdcard_wait_busy()) {
 615                         ret = 0x3f;
 616                         goto bail;
 617                 }
 618
 619                 /* Check the current status after the write completes */
 620                 status = _ao_sdcard_send_status();
 621                 if ((status & 0xff) != SDCARD_STATUS_READY_STATE) {
 622                         WARN ("send status after write %04x\n", status);
 623                         ret = status & 0xff;
 624                         goto bail;
 625                 }
 626         bail:
 627                 ao_sdcard_deselect();
 628                 DBG("write %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure");
 629                 if (ret == SDCARD_STATUS_READY_STATE)
 630                         break;
 631         }
 632         ao_sdcard_put();
 633         ao_sdcard_unlock();
 634         if (tries)
 635                 WARN("took %d tries to write %d\n", tries + 1, block);
 636
 637         return ret == SDCARD_STATUS_READY_STATE;
 638 }
 639
 640 #if SDCARD_DEBUG
 641 static uint8_t  test_data[512];
 642
 643 static void
 644 ao_sdcard_test_read(void)
 645 {
 646         int i;
 647
 648         ao_cmd_decimal();
 649         if (ao_cmd_status != ao_cmd_success)
 650                 return;
 651
 652         for (i = 0; i < 100; i++) {
 653                 printf ("."); flush();
 654                 if (!ao_sdcard_read_block(ao_cmd_lex_u32+i, test_data)) {
 655                         printf ("read error %d\n", i);
 656                         return;
 657                 }
 658         }
 659         printf ("data:");
 660         for (i = 0; i < 18; i++)
 661                 printf (" %02x", test_data[i]);
 662         printf ("\n");
 663 }
 664
 665 static void
 666 ao_sdcard_test_write(void)
 667 {
 668         int     i;
 669         printf ("data:");
 670         for (i = 0; i < 16; i++) {
 671                 test_data[i]++;
 672                 printf (" %02x", test_data[i]);
 673         }
 674         printf ("\n");
 675         if (!ao_sdcard_write_block(1, test_data)) {
 676                 printf ("write error\n");
 677                 return;
 678         }
 679 }
 680
 681 static const struct ao_cmds ao_sdcard_cmds[] = {
 682         { ao_sdcard_test_read,  "x\0Test read" },
 683         { ao_sdcard_test_write, "y\0Test read" },
 684         { 0, NULL },
 685 };
 686 #endif
 687
 688 void
 689 ao_sdcard_init(void)
 690 {
 691         stm_pupdr_set(AO_SDCARD_SPI_PORT, AO_SDCARD_SPI_SCK_PIN, STM_PUPDR_PULL_UP);
 692         stm_pupdr_set(AO_SDCARD_SPI_PORT, AO_SDCARD_SPI_MISO_PIN, STM_PUPDR_PULL_UP);
 693         stm_pupdr_set(AO_SDCARD_SPI_PORT, AO_SDCARD_SPI_MOSI_PIN, STM_PUPDR_PULL_UP);
 694         ao_spi_init_cs(AO_SDCARD_SPI_CS_PORT, (1 << AO_SDCARD_SPI_CS_PIN));
 695 #if SDCARD_DEBUG
 696         ao_cmd_register(&ao_sdcard_cmds[0]);
 697 #endif
 698 }