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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 #if HAS_RADIO
  22 extern uint8_t ao_radio_mutex;
  23 #define get_radio()     ao_mutex_get(&ao_radio_mutex)
  24 #define put_radio()     ao_mutex_put(&ao_radio_mutex)
  25 #else
  26 #define get_radio()
  27 #define put_radio()
  28 #endif
  29
  30 #define ao_sdcard_get_slow() do { get_radio(); ao_spi_get(AO_SDCARD_SPI_BUS, AO_SPI_SPEED_250kHz); } while (0)
  31 #define ao_sdcard_get() do { get_radio(); ao_spi_get(AO_SDCARD_SPI_BUS, AO_SPI_SPEED_FAST); } while (0)
  32 #define ao_sdcard_put() do { ao_spi_put(AO_SDCARD_SPI_BUS); put_radio(); } while (0)
  33 #define ao_sdcard_send_fixed(d,l)       ao_spi_send_fixed((d), (l), AO_SDCARD_SPI_BUS)
  34 #define ao_sdcard_send(d,l)             ao_spi_send((d), (l), AO_SDCARD_SPI_BUS)
  35 #define ao_sdcard_recv(d,l)             ao_spi_recv((d), (l), AO_SDCARD_SPI_BUS)
  36 #define ao_sdcard_select()              ao_gpio_set(AO_SDCARD_SPI_CS_PORT,AO_SDCARD_SPI_CS_PIN,AO_SDCARD_SPI_CS,0)
  37 #define ao_sdcard_deselect()            ao_gpio_set(AO_SDCARD_SPI_CS_PORT,AO_SDCARD_SPI_CS_PIN,AO_SDCARD_SPI_CS,1)
  38
  39 /* Include SD card commands */
  40 #define SDCARD_DEBUG    0
  41
  42 /* Spew SD tracing */
  43 #define SDCARD_TRACE    0
  44
  45 /* Emit error and warning messages */
  46 #define SDCARD_WARN     0
  47
  48 static uint8_t  initialized;
  49 static uint8_t  present;
  50 static uint8_t  mutex;
  51 static enum ao_sdtype sdtype;
  52
  53 #define ao_sdcard_lock()        ao_mutex_get(&mutex)
  54 #define ao_sdcard_unlock()      ao_mutex_put(&mutex)
  55
  56 #if SDCARD_TRACE
  57 #define DBG(...) printf(__VA_ARGS__)
  58 #else
  59 #define DBG(...)
  60 #endif
  61
  62 #if SDCARD_WARN
  63 #define WARN(...) printf(__VA_ARGS__)
  64 #else
  65 #define WARN(...)
  66 #endif
  67
  68 #define later(x,y)      ((int16_t) ((x) - (y)) >= 0)
  69
  70 /*
  71  * Wait while the card is busy. The card will return a stream of 0xff
  72  * when it is ready to accept a command
  73  */
  74
  75 static uint8_t
  76 ao_sdcard_wait_busy(void)
  77 {
  78         uint16_t        timeout = ao_time() + SDCARD_BUSY_TIMEOUT;
  79         uint8_t         reply;
  80         for (;;) {
  81                 ao_sdcard_recv(&reply, 1);
  82                 DBG("\t\twait busy %02x\n", reply);
  83                 if (reply == 0xff)
  84                         break;
  85                 if (later(ao_time(), timeout)) {
  86                         WARN("wait busy timeout\n");
  87                         return 0;
  88                 }
  89         }
  90         return 1;
  91 }
  92
  93
  94 /*
  95  * Send an SD command and await the status reply
  96  */
  97
  98 static uint8_t
  99 ao_sdcard_send_cmd(uint8_t cmd, uint32_t arg)
 100 {
 101         uint8_t data[6];
 102         uint8_t reply;
 103         int i;
 104         uint16_t timeout;
 105
 106         DBG ("\tsend_cmd %d arg %08x\n", cmd, arg);
 107
 108         /* Wait for the card to not be busy */
 109         if (cmd != SDCARD_GO_IDLE_STATE) {
 110                 if (!ao_sdcard_wait_busy())
 111                         return SDCARD_STATUS_TIMEOUT;
 112         }
 113
 114         data[0] = cmd & 0x3f | 0x40;
 115         data[1] = arg >> 24;
 116         data[2] = arg >> 16;
 117         data[3] = arg >> 8;
 118         data[4] = arg;
 119         if (cmd == SDCARD_GO_IDLE_STATE)
 120                 data[5] = 0x95; /* Valid for 0 arg */
 121         else if (cmd == SDCARD_SEND_IF_COND)
 122                 data[5] = 0x87; /* Valid for 0x1aa arg */
 123         else
 124                 data[5] = 0xff; /* no CRC */
 125         ao_sdcard_send(data, 6);
 126
 127         /* The first reply byte will be the status,
 128          * which must have the high bit clear
 129          */
 130         timeout = ao_time() + SDCARD_CMD_TIMEOUT;
 131         for (;;) {
 132                 ao_sdcard_recv(&reply, 1);
 133                 DBG ("\t\tgot byte %02x\n", reply);
 134                 if ((reply & 0x80) == 0)
 135                         break;
 136                 if (later(ao_time(), timeout)) {
 137                         WARN("send_cmd %02x timeout\n", cmd);
 138                         return SDCARD_STATUS_TIMEOUT;
 139                 }
 140         }
 141 #if SDCARD_WARN
 142         if (reply != SDCARD_STATUS_READY_STATE && reply != SDCARD_STATUS_IDLE_STATE)
 143                 WARN("send_cmd %d failed %02x\n", cmd, reply);
 144 #endif
 145         return reply;
 146 }
 147
 148 /*
 149  * Retrieve any reply, discarding the trailing CRC byte
 150  */
 151 static void
 152 ao_sdcard_recv_reply(uint8_t *reply, int len)
 153 {
 154         uint8_t discard;
 155
 156         if (len)
 157                 ao_sdcard_recv(reply, len);
 158         /* trailing byte */
 159         ao_sdcard_recv(&discard, 1);
 160 }
 161
 162 /*
 163  * Switch to 'idle' state. This is used to get the card into SPI mode
 164  */
 165 static uint8_t
 166 ao_sdcard_go_idle_state(void)
 167 {
 168         uint8_t ret;
 169
 170         DBG ("go_idle_state\n");
 171         ao_sdcard_select();
 172         ret = ao_sdcard_send_cmd(SDCARD_GO_IDLE_STATE, 0);
 173         ao_sdcard_recv_reply(NULL, 0);
 174         ao_sdcard_deselect();
 175         DBG ("\tgo_idle_state status %02x\n", ret);
 176         return ret;
 177 }
 178
 179 static uint8_t
 180 ao_sdcard_send_op_cond(void)
 181 {
 182         uint8_t ret;
 183
 184         DBG ("send_op_cond\n");
 185         ao_sdcard_select();
 186         ret = ao_sdcard_send_cmd(SDCARD_SEND_OP_COND, 0);
 187         ao_sdcard_recv_reply(NULL, 0);
 188         ao_sdcard_deselect();
 189         DBG ("\tsend_op_cond %02x\n", ret);
 190         return ret;
 191 }
 192
 193 static uint8_t
 194 ao_sdcard_send_if_cond(uint32_t arg, uint8_t send_if_cond_response[4])
 195 {
 196         uint8_t ret;
 197
 198         DBG ("send_if_cond\n");
 199         ao_sdcard_select();
 200         ret = ao_sdcard_send_cmd(SDCARD_SEND_IF_COND, arg);
 201         if (ret != SDCARD_STATUS_IDLE_STATE) {
 202                 DBG ("\tsend_if_cond failed %02x\n", ret);
 203                 return ret;
 204         }
 205         ao_sdcard_recv_reply(send_if_cond_response, 4);
 206         DBG ("send_if_cond status %02x response %02x %02x %02x %02x\n",
 207                 ret,
 208                 send_if_cond_response[0],
 209                 send_if_cond_response[1],
 210                 send_if_cond_response[2],
 211                 send_if_cond_response[3]);
 212         ao_sdcard_deselect();
 213         return ret;
 214 }
 215
 216 /*
 217  * _ao_sdcard_send_status
 218  *
 219  * Get the 2-byte status value.
 220  *
 221  * Called from other functions with CS held low already,
 222  * hence prefixing the name with '_'
 223  */
 224 static uint16_t
 225 _ao_sdcard_send_status(void)
 226 {
 227         uint8_t ret;
 228         uint8_t extra;
 229
 230         DBG ("send_status\n");
 231         ret = ao_sdcard_send_cmd(SDCARD_SEND_STATUS, 0);
 232         ao_sdcard_recv_reply(&extra, 1);
 233         if (ret != SDCARD_STATUS_READY_STATE)
 234                 DBG ("\tsend_if_cond failed %02x\n", ret);
 235         return ret | (extra << 8);
 236 }
 237
 238 /*
 239  * ao_sdcard_set_blocklen
 240  *
 241  * Set the block length for future read and write commands
 242  */
 243 static uint8_t
 244 ao_sdcard_set_blocklen(uint32_t blocklen)
 245 {
 246         uint8_t ret;
 247
 248         DBG ("set_blocklen %d\n", blocklen);
 249         ao_sdcard_select();
 250         ret = ao_sdcard_send_cmd(SDCARD_SET_BLOCKLEN, blocklen);
 251         ao_sdcard_recv_reply(NULL, 0);
 252         ao_sdcard_deselect();
 253         if (ret != SDCARD_STATUS_READY_STATE)
 254                 DBG ("\tsend_if_cond failed %02x\n", ret);
 255         return ret;
 256 }
 257
 258 /*
 259  * _ao_sdcard_app_cmd
 260  *
 261  * Send the app command prefix
 262  *
 263  * Called with the CS held low, hence
 264  * the '_' prefix
 265  */
 266 static uint8_t
 267 _ao_sdcard_app_cmd(void)
 268 {
 269         uint8_t ret;
 270
 271         DBG ("app_cmd\n");
 272         ret = ao_sdcard_send_cmd(SDCARD_APP_CMD, 0);
 273         ao_sdcard_recv_reply(NULL, 0);
 274         DBG ("\tapp_cmd status %02x\n");
 275         return ret;
 276 }
 277
 278 static uint8_t
 279 ao_sdcard_app_send_op_cond(uint32_t arg)
 280 {
 281         uint8_t ret;
 282
 283         DBG("send_op_comd\n");
 284         ao_sdcard_select();
 285         ret = _ao_sdcard_app_cmd();
 286         if (ret != SDCARD_STATUS_IDLE_STATE)
 287                 goto bail;
 288         ret = ao_sdcard_send_cmd(SDCARD_APP_SEND_OP_COMD, arg);
 289         ao_sdcard_recv_reply(NULL, 0);
 290 bail:
 291         ao_sdcard_deselect();
 292         DBG ("\tapp_send_op_cond status %02x\n", ret);
 293         return ret;
 294 }
 295
 296 static uint8_t
 297 ao_sdcard_read_ocr(uint8_t read_ocr_response[4])
 298 {
 299         uint8_t ret;
 300
 301         DBG ("read_ocr\n");
 302         ao_sdcard_select();
 303         ret = ao_sdcard_send_cmd(SDCARD_READ_OCR, 0);
 304         if (ret != SDCARD_STATUS_READY_STATE)
 305                 DBG ("\tread_ocr failed %02x\n", ret);
 306         else {
 307                 ao_sdcard_recv_reply(read_ocr_response, 4);
 308                 DBG ("\tread_ocr status %02x response %02x %02x %02x %02x\n", ret,
 309                         read_ocr_response[0], read_ocr_response[1],
 310                         read_ocr_response[2], read_ocr_response[3]);
 311         }
 312         ao_sdcard_deselect();
 313         return ret;
 314 }
 315
 316 /*
 317  * Follow the flow-chart defined by the SD group to
 318  * initialize the card and figure out what kind it is
 319  */
 320 static void
 321 ao_sdcard_setup(void)
 322 {
 323         int     i;
 324         uint8_t ret;
 325         uint8_t response[10];
 326
 327         DBG ("Testing sdcard\n");
 328
 329         ao_sdcard_get_slow();
 330         /*
 331          * min 74 clocks with CS high
 332          */
 333         ao_sdcard_send_fixed(0xff, 10);
 334
 335         /* Reset the card and get it into SPI mode */
 336         for (i = 0; i < SDCARD_IDLE_RETRY; i++) {
 337                 if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE)
 338                         break;
 339         }
 340         if (i == SDCARD_IDLE_RETRY)
 341                 goto bail;
 342
 343         /* Figure out what kind of card we have */
 344         sdtype = ao_sdtype_unknown;
 345
 346         if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) {
 347                 uint32_t        arg = 0;
 348                 uint8_t         sdver2 = 0;
 349
 350                 /* Check for SD version 2 */
 351                 if ((response[2] & 0xf) == 1 && response[3] == 0xaa) {
 352                         arg = 0x40000000;
 353                         sdver2 = 1;
 354                 }
 355
 356                 for (i = 0; i < SDCARD_OP_COND_RETRY; i++) {
 357                         ao_delay(AO_MS_TO_TICKS(10));
 358                         ret = ao_sdcard_app_send_op_cond(arg);
 359                         if (ret != SDCARD_STATUS_IDLE_STATE)
 360                                 break;
 361                 }
 362                 if (ret != SDCARD_STATUS_READY_STATE) {
 363                         /* MMC */
 364                         for (i = 0; i < SDCARD_OP_COND_RETRY; i++) {
 365                                 ao_delay(AO_MS_TO_TICKS(10));
 366                                 ret = ao_sdcard_send_op_cond();
 367                                 if (ret != SDCARD_STATUS_IDLE_STATE)
 368                                         break;
 369                         }
 370                         if (ret != SDCARD_STATUS_READY_STATE)
 371                                 goto bail;
 372                         sdtype = ao_sdtype_mmc3;
 373                 } else {
 374                         /* SD */
 375                         if (sdver2 != 0) {
 376                                 ret = ao_sdcard_read_ocr(response);
 377                                 if (ret != SDCARD_STATUS_READY_STATE)
 378                                         goto bail;
 379                                 if ((response[0] & 0xc0) == 0xc0)
 380                                         sdtype = ao_sdtype_sd2block;
 381                                 else
 382                                         sdtype = ao_sdtype_sd2byte;
 383                         } else {
 384                                 sdtype = ao_sdtype_sd1;
 385                         }
 386                 }
 387
 388                 /* For everything but SDHC cards, set the block length */
 389                 if (sdtype != ao_sdtype_sd2block) {
 390                         ret = ao_sdcard_set_blocklen(512);
 391                         if (ret != SDCARD_STATUS_READY_STATE)
 392                                 DBG ("set_blocklen failed, ignoring\n");
 393                 }
 394         }
 395
 396         DBG ("SD card detected, type %d\n", sdtype);
 397 bail:
 398         ao_sdcard_put();
 399 }
 400
 401 static uint8_t
 402 _ao_sdcard_reset(void)
 403 {
 404         int i;
 405         uint8_t ret;
 406         uint8_t response[10];
 407
 408         for (i = 0; i < SDCARD_IDLE_RETRY; i++) {
 409                 if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE)
 410                         break;
 411         }
 412         if (i == SDCARD_IDLE_RETRY) {
 413                 ret = 0x3f;
 414                 goto bail;
 415         }
 416
 417         /* Follow the setup path to get the card out of idle state and
 418          * up and running again
 419          */
 420         if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) {
 421                 uint32_t        arg = 0;
 422                 uint8_t         sdver2 = 0;
 423
 424                 /* Check for SD version 2 */
 425                 if ((response[2] & 0xf) == 1 && response[3] == 0xaa) {
 426                         arg = 0x40000000;
 427                         sdver2 = 1;
 428                 }
 429
 430                 for (i = 0; i < SDCARD_IDLE_RETRY; i++) {
 431                         ret = ao_sdcard_app_send_op_cond(arg);
 432                         if (ret != SDCARD_STATUS_IDLE_STATE)
 433                                 break;
 434                 }
 435
 436                 if (ret != SDCARD_STATUS_READY_STATE) {
 437                         /* MMC */
 438                         for (i = 0; i < SDCARD_IDLE_RETRY; i++) {
 439                                 ret = ao_sdcard_send_op_cond();
 440                                 if (ret != SDCARD_STATUS_IDLE_STATE)
 441                                         break;
 442                         }
 443                         if (ret != SDCARD_STATUS_READY_STATE)
 444                                 goto bail;
 445                 }
 446
 447                 /* For everything but SDHC cards, set the block length */
 448                 if (sdtype != ao_sdtype_sd2block) {
 449                         ret = ao_sdcard_set_blocklen(512);
 450                         if (ret != SDCARD_STATUS_READY_STATE)
 451                                 DBG ("set_blocklen failed, ignoring\n");
 452                 }
 453         }
 454 bail:
 455         return ret;
 456 }
 457
 458 /*
 459  * The card will send 0xff until it is ready to send
 460  * the data block at which point it will send the START_BLOCK
 461  * marker followed by the data. This function waits while
 462  * the card is sending 0xff
 463  */
 464 static uint8_t
 465 ao_sdcard_wait_block_start(void)
 466 {
 467         uint8_t         v;
 468         uint16_t        timeout = ao_time() + SDCARD_BLOCK_TIMEOUT;
 469
 470         DBG ("\twait_block_start\n");
 471         for (;;) {
 472                 ao_sdcard_recv(&v, 1);
 473                 DBG("\t\trecv %02x\n", v);
 474                 if (v != 0xff)
 475                         break;
 476                 if (later(ao_time(), timeout)) {
 477                         printf ("wait block start timeout\n");
 478                         return 0xff;
 479                 }
 480         }
 481         return v;
 482 }
 483
 484 /*
 485  * Read a block of 512 bytes from the card
 486  */
 487 uint8_t
 488 ao_sdcard_read_block(uint32_t block, uint8_t *data)
 489 {
 490         uint8_t ret;
 491         uint8_t start_block;
 492         uint8_t crc[2];
 493         int tries;
 494
 495         ao_sdcard_lock();
 496         if (!initialized) {
 497                 ao_sdcard_setup();
 498                 initialized = 1;
 499                 if (sdtype != ao_sdtype_unknown)
 500                         present = 1;
 501         }
 502         if (!present) {
 503                 ao_sdcard_unlock();
 504                 return 0;
 505         }
 506         DBG("read block %d\n", block);
 507         if (sdtype != ao_sdtype_sd2block)
 508                 block <<= 9;
 509
 510         ao_sdcard_get();
 511         for (tries = 0; tries < 10; tries++) {
 512                 ao_sdcard_select();
 513
 514                 ret = ao_sdcard_send_cmd(SDCARD_READ_BLOCK, block);
 515                 ao_sdcard_recv_reply(NULL, 0);
 516                 if (ret != SDCARD_STATUS_READY_STATE) {
 517                         uint16_t        status;
 518                         WARN ("read block command failed %d status %02x\n", block, ret);
 519                         status = _ao_sdcard_send_status();
 520                         WARN ("\tstatus now %04x\n", status);
 521                         goto bail;
 522                 }
 523
 524                 ao_sdcard_send_fixed(0xff, 1);
 525
 526                 /* Wait for the data start block marker */
 527                 start_block = ao_sdcard_wait_block_start();
 528                 if (start_block != SDCARD_DATA_START_BLOCK) {
 529                         WARN ("wait block start failed %02x\n", start_block);
 530                         ret = 0x3f;
 531                         goto bail;
 532                 }
 533
 534                 ao_sdcard_recv(data, 512);
 535                 ao_sdcard_recv(crc, 2);
 536         bail:
 537                 ao_sdcard_deselect();
 538                 if (ret == SDCARD_STATUS_READY_STATE)
 539                         break;
 540                 if (ret == SDCARD_STATUS_IDLE_STATE) {
 541                         ret = _ao_sdcard_reset();
 542                         if (ret != SDCARD_STATUS_READY_STATE)
 543                                 break;
 544                 }
 545         }
 546         ao_sdcard_put();
 547         ao_sdcard_unlock();
 548
 549 #if SDCARD_WARN
 550         if (ret != SDCARD_STATUS_READY_STATE)
 551                 WARN("read failed\n");
 552         else if (tries)
 553                 WARN("took %d tries to read %d\n", tries + 1, block);
 554 #endif
 555
 556         DBG("read %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure");
 557         return ret == SDCARD_STATUS_READY_STATE;
 558 }
 559
 560 /*
 561  * Write a block of 512 bytes to the card
 562  */
 563 uint8_t
 564 ao_sdcard_write_block(uint32_t block, uint8_t *data)
 565 {
 566         uint8_t ret;
 567         uint8_t response[1];
 568         uint8_t start_block[8];
 569         uint16_t status;
 570         static uint8_t  check_data[512];
 571         int     i;
 572         int     tries;
 573
 574         ao_sdcard_lock();
 575         if (!initialized) {
 576                 ao_sdcard_setup();
 577                 initialized = 1;
 578                 if (sdtype != ao_sdtype_unknown)
 579                         present = 1;
 580         }
 581         if (!present) {
 582                 ao_sdcard_unlock();
 583                 return 0;
 584         }
 585         DBG("write block %d\n", block);
 586         if (sdtype != ao_sdtype_sd2block)
 587                 block <<= 9;
 588
 589         ao_sdcard_get();
 590
 591         for (tries = 0; tries < 10; tries++) {
 592                 ao_sdcard_select();
 593
 594                 ret = ao_sdcard_send_cmd(SDCARD_WRITE_BLOCK, block);
 595                 ao_sdcard_recv_reply(NULL, 0);
 596                 if (ret != SDCARD_STATUS_READY_STATE)
 597                         goto bail;
 598
 599                 /* Write a pad byte followed by the data start block marker */
 600                 start_block[0] = 0xff;
 601                 start_block[1] = SDCARD_DATA_START_BLOCK;
 602                 ao_sdcard_send(start_block, 2);
 603
 604                 /* Send the data */
 605                 ao_sdcard_send(data, 512);
 606
 607                 /* Fake the CRC */
 608                 ao_sdcard_send_fixed(0xff, 2);
 609
 610                 /* See if the card liked the data */
 611                 ao_sdcard_recv(response, sizeof (response));
 612                 if ((response[0] & SDCARD_DATA_RES_MASK) != SDCARD_DATA_RES_ACCEPTED) {
 613                         int i;
 614                         WARN("Data not accepted, response");
 615                         for (i = 0; i < sizeof (response); i++)
 616                                 WARN(" %02x", response[i]);
 617                         WARN("\n");
 618                         ret = 0x3f;
 619                         goto bail;
 620                 }
 621
 622                 /* Wait for the bus to go idle (should be done with an interrupt?) */
 623                 if (!ao_sdcard_wait_busy()) {
 624                         ret = 0x3f;
 625                         goto bail;
 626                 }
 627
 628                 /* Check the current status after the write completes */
 629                 status = _ao_sdcard_send_status();
 630                 if ((status & 0xff) != SDCARD_STATUS_READY_STATE) {
 631                         WARN ("send status after write %04x\n", status);
 632                         ret = status & 0xff;
 633                         goto bail;
 634                 }
 635         bail:
 636                 ao_sdcard_deselect();
 637                 DBG("write %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure");
 638                 if (ret == SDCARD_STATUS_READY_STATE)
 639                         break;
 640         }
 641         ao_sdcard_put();
 642         ao_sdcard_unlock();
 643         if (tries)
 644                 WARN("took %d tries to write %d\n", tries + 1, block);
 645
 646         return ret == SDCARD_STATUS_READY_STATE;
 647 }
 648
 649 #if SDCARD_DEBUG
 650 static uint8_t  test_data[512];
 651
 652 static void
 653 ao_sdcard_test_read(void)
 654 {
 655         int i;
 656
 657         ao_cmd_decimal();
 658         if (ao_cmd_status != ao_cmd_success)
 659                 return;
 660
 661         for (i = 0; i < 100; i++) {
 662                 printf ("."); flush();
 663                 if (!ao_sdcard_read_block(ao_cmd_lex_u32+i, test_data)) {
 664                         printf ("read error %d\n", i);
 665                         return;
 666                 }
 667         }
 668         printf ("data:");
 669         for (i = 0; i < 18; i++)
 670                 printf (" %02x", test_data[i]);
 671         printf ("\n");
 672 }
 673
 674 static void
 675 ao_sdcard_test_write(void)
 676 {
 677         int     i;
 678         printf ("data:");
 679         for (i = 0; i < 16; i++) {
 680                 test_data[i]++;
 681                 printf (" %02x", test_data[i]);
 682         }
 683         printf ("\n");
 684         if (!ao_sdcard_write_block(1, test_data)) {
 685                 printf ("write error\n");
 686                 return;
 687         }
 688 }
 689
 690 static const struct ao_cmds ao_sdcard_cmds[] = {
 691         { ao_sdcard_test_read,  "x\0Test read" },
 692         { ao_sdcard_test_write, "y\0Test read" },
 693         { 0, NULL },
 694 };
 695 #endif
 696
 697 void
 698 ao_sdcard_init(void)
 699 {
 700         stm_pupdr_set(AO_SDCARD_SPI_PORT, AO_SDCARD_SPI_SCK_PIN, STM_PUPDR_PULL_UP);
 701         stm_pupdr_set(AO_SDCARD_SPI_PORT, AO_SDCARD_SPI_MISO_PIN, STM_PUPDR_PULL_UP);
 702         stm_pupdr_set(AO_SDCARD_SPI_PORT, AO_SDCARD_SPI_MOSI_PIN, STM_PUPDR_PULL_UP);
 703         ao_spi_init_cs(AO_SDCARD_SPI_CS_PORT, (1 << AO_SDCARD_SPI_CS_PIN));
 704 #if SDCARD_DEBUG
 705         ao_cmd_register(&ao_sdcard_cmds[0]);
 706 #endif
 707 }