1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
|
/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file mmc_spi.c
* @brief MMC over SPI driver code.
*
* @addtogroup MMC_SPI
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_MMC_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Inserion monitor timer callback function.
*
* @param[in] p pointer to the @p MMCDriver object
*
* @notapi
*/
static void tmrfunc(void *p) {
MMCDriver *mmcp = p;
if (mmcp->mmc_cnt > 0) {
if (mmcp->mmc_is_inserted()) {
if (--mmcp->mmc_cnt == 0) {
mmcp->mmc_state = MMC_INSERTED;
chEvtBroadcastI(&mmcp->mmc_inserted_event);
}
}
else
mmcp->mmc_cnt = MMC_POLLING_INTERVAL;
}
else {
if (!mmcp->mmc_is_inserted()) {
mmcp->mmc_state = MMC_WAIT;
mmcp->mmc_cnt = MMC_POLLING_INTERVAL;
chEvtBroadcastI(&mmcp->mmc_removed_event);
}
}
chVTSetI(&mmcp->mmc_vt, MS2ST(MMC_POLLING_DELAY), tmrfunc, mmcp);
}
/**
* @brief Waits an idle condition.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @notapi
*/
static void wait(MMCDriver *mmcp) {
int i;
uint8_t buf[4];
for (i = 0; i < 16; i++) {
spiReceive(mmcp->mmc_spip, 1, buf);
if (buf[0] == 0xFF)
break;
}
/* Looks like it is a long wait.*/
while (TRUE) {
spiReceive(mmcp->mmc_spip, 1, buf);
if (buf[0] == 0xFF)
break;
#ifdef MMC_NICE_WAITING
/* Trying to be nice with the other threads.*/
chThdSleep(1);
#endif
}
}
/**
* @brief Sends a command header.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param cmd[in] the command id
* @param arg[in] the command argument
*
* @notapi
*/
static void send_hdr(MMCDriver *mmcp, uint8_t cmd, uint32_t arg) {
uint8_t buf[6];
/* Wait for the bus to become idle if a write operation was in progress. */
wait(mmcp);
buf[0] = 0x40 | cmd;
buf[1] = arg >> 24;
buf[2] = arg >> 16;
buf[3] = arg >> 8;
buf[4] = arg;
buf[5] = 0x95; /* Valid for CMD0 ignored by other commands. */
spiSend(mmcp->mmc_spip, 6, buf);
}
/**
* @brief Receives a single byte response.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The response as an @p uint8_t value.
* @retval 0xFF timed out.
*
* @notapi
*/
static uint8_t recvr1(MMCDriver *mmcp) {
int i;
uint8_t r1[1];
for (i = 0; i < 9; i++) {
spiReceive(mmcp->mmc_spip, 1, r1);
if (r1[0] != 0xFF)
return r1[0];
}
return 0xFF;
}
/**
* @brief Sends a command an returns a single byte response.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param cmd[in] the command id
* @param arg[in] the command argument
* @return The response as an @p uint8_t value.
* @retval 0xFF timed out.
*
* @notapi
*/
static uint8_t send_command(MMCDriver *mmcp, uint8_t cmd, uint32_t arg) {
uint8_t r1;
spiSelect(mmcp->mmc_spip);
send_hdr(mmcp, cmd, arg);
r1 = recvr1(mmcp);
spiUnselect(mmcp->mmc_spip);
return r1;
}
/**
* @brief Waits that the card reaches an idle state.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @notapi
*/
static void sync(MMCDriver *mmcp) {
uint8_t buf[1];
spiSelect(mmcp->mmc_spip);
while (TRUE) {
spiReceive(mmcp->mmc_spip, 1, buf);
if (buf[0] == 0xFF)
break;
#ifdef MMC_NICE_WAITING
chThdSleep(1); /* Trying to be nice with the other threads.*/
#endif
}
spiUnselect(mmcp->mmc_spip);
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief MMC over SPI driver initialization.
*
* @init
*/
void mmcInit(void) {
}
/**
* @brief Initializes an instance.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] spip pointer to the SPI driver to be used as interface
* @param[in] lscfg low speed configuration for the SPI driver
* @param[in] hscfg high speed configuration for the SPI driver
* @param[in] is_protected function that returns the card write protection
* setting
* @param[in] is_inserted function that returns the card insertion sensor
* status
*
* @init
*/
void mmcObjectInit(MMCDriver *mmcp, SPIDriver *spip,
const SPIConfig *lscfg, const SPIConfig *hscfg,
mmcquery_t is_protected, mmcquery_t is_inserted) {
mmcp->mmc_state = MMC_STOP;
mmcp->mmc_config = NULL;
mmcp->mmc_spip = spip;
mmcp->mmc_lscfg = lscfg;
mmcp->mmc_hscfg = hscfg;
mmcp->mmc_is_protected = is_protected;
mmcp->mmc_is_inserted = is_inserted;
chEvtInit(&mmcp->mmc_inserted_event);
chEvtInit(&mmcp->mmc_removed_event);
}
/**
* @brief Configures and activates the MMC peripheral.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] config pointer to the @p MMCConfig object
*
* @api
*/
void mmcStart(MMCDriver *mmcp, const MMCConfig *config) {
chDbgCheck((mmcp != NULL) && (config != NULL), "mmcStart");
chSysLock();
chDbgAssert(mmcp->mmc_state == MMC_STOP, "mmcStart(), #1", "invalid state");
mmcp->mmc_config = config;
mmcp->mmc_state = MMC_WAIT;
mmcp->mmc_cnt = MMC_POLLING_INTERVAL;
chVTSetI(&mmcp->mmc_vt, MS2ST(MMC_POLLING_DELAY), tmrfunc, mmcp);
chSysUnlock();
}
/**
* @brief Disables the MMC peripheral.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @api
*/
void mmcStop(MMCDriver *mmcp) {
chDbgCheck(mmcp != NULL, "mmcStop");
chSysLock();
chDbgAssert((mmcp->mmc_state != MMC_UNINIT) &&
(mmcp->mmc_state != MMC_READING) &&
(mmcp->mmc_state != MMC_WRITING),
"mmcStop(), #1",
"invalid state");
if (mmcp->mmc_state != MMC_STOP) {
mmcp->mmc_state = MMC_STOP;
chVTResetI(&mmcp->mmc_vt);
}
chSysUnlock();
spiStop(mmcp->mmc_spip);
}
/**
* @brief Performs the initialization procedure on the inserted card.
* @details This function should be invoked when a card is inserted and
* brings the driver in the @p MMC_READY state where it is possible
* to perform read and write operations.
* @note It is possible to invoke this function from the insertion event
* handler.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded and the driver is now
* in the @p MMC_READY state.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcConnect(MMCDriver *mmcp) {
unsigned i;
bool_t result;
chDbgCheck(mmcp != NULL, "mmcConnect");
chDbgAssert((mmcp->mmc_state != MMC_UNINIT) &&
(mmcp->mmc_state != MMC_STOP),
"mmcConnect(), #1",
"invalid state");
if (mmcp->mmc_state == MMC_INSERTED) {
/* Slow clock mode and 128 clock pulses.*/
spiStart(mmcp->mmc_spip, mmcp->mmc_lscfg);
spiIgnore(mmcp->mmc_spip, 16);
/* SPI mode selection.*/
i = 0;
while (TRUE) {
if (send_command(mmcp, MMC_CMDGOIDLE, 0) == 0x01)
break;
if (++i >= MMC_CMD0_RETRY)
return TRUE;
chThdSleepMilliseconds(10);
}
/* Initialization. */
i = 0;
while (TRUE) {
uint8_t b = send_command(mmcp, MMC_CMDINIT, 0);
if (b == 0x00)
break;
if (b != 0x01)
return TRUE;
if (++i >= MMC_CMD1_RETRY)
return TRUE;
chThdSleepMilliseconds(10);
}
/* Initialization complete, full speed. */
spiStart(mmcp->mmc_spip, mmcp->mmc_hscfg);
/* Setting block size.*/
if (send_command(mmcp, MMC_CMDSETBLOCKLEN, MMC_SECTOR_SIZE) != 0x00)
return TRUE;
/* Transition to MMC_READY state (if not extracted).*/
chSysLock();
if (mmcp->mmc_state == MMC_INSERTED) {
mmcp->mmc_state = MMC_READY;
result = FALSE;
}
else
result = TRUE;
chSysUnlock();
return result;
}
if (mmcp->mmc_state == MMC_READY)
return FALSE;
/* Any other state is invalid.*/
return TRUE;
}
/**
* @brief Brings the driver in a state safe for card removal.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded and the driver is now
* in the @p MMC_INSERTED state.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcDisconnect(MMCDriver *mmcp) {
bool_t status;
chDbgCheck(mmcp != NULL, "mmcDisconnect");
chDbgAssert((mmcp->mmc_state != MMC_UNINIT) &&
(mmcp->mmc_state != MMC_STOP),
"mmcDisconnect(), #1",
"invalid state");
switch (mmcp->mmc_state) {
case MMC_READY:
/* Wait for the pending write operations to complete.*/
sync(mmcp);
chSysLock();
if (mmcp->mmc_state == MMC_READY)
mmcp->mmc_state = MMC_INSERTED;
chSysUnlock();
case MMC_INSERTED:
status = FALSE;
default:
status = TRUE;
}
spiStop(mmcp->mmc_spip);
return status;
}
/**
* @brief Starts a sequential read.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] startblk first block to read
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStartSequentialRead(MMCDriver *mmcp, uint32_t startblk) {
chDbgCheck(mmcp != NULL, "mmcStartSequentialRead");
chSysLock();
if (mmcp->mmc_state != MMC_READY) {
chSysUnlock();
return TRUE;
}
mmcp->mmc_state = MMC_READING;
chSysUnlock();
spiStart(mmcp->mmc_spip, mmcp->mmc_hscfg);
spiSelect(mmcp->mmc_spip);
send_hdr(mmcp, MMC_CMDREADMULTIPLE, startblk * MMC_SECTOR_SIZE);
if (recvr1(mmcp) != 0x00) {
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_READING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
return FALSE;
}
/**
* @brief Reads a block within a sequential read operation.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[out] buffer pointer to the read buffer
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcSequentialRead(MMCDriver *mmcp, uint8_t *buffer) {
int i;
chDbgCheck((mmcp != NULL) && (buffer != NULL), "mmcSequentialRead");
chSysLock();
if (mmcp->mmc_state != MMC_READING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
for (i = 0; i < MMC_WAIT_DATA; i++) {
spiReceive(mmcp->mmc_spip, 1, buffer);
if (buffer[0] == 0xFE) {
spiReceive(mmcp->mmc_spip, MMC_SECTOR_SIZE, buffer);
/* CRC ignored. */
spiIgnore(mmcp->mmc_spip, 2);
return FALSE;
}
}
/* Timeout.*/
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_READING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
/**
* @brief Stops a sequential read gracefully.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStopSequentialRead(MMCDriver *mmcp) {
static const uint8_t stopcmd[] = {0x40 | MMC_CMDSTOP, 0, 0, 0, 0, 1, 0xFF};
bool_t result;
chDbgCheck(mmcp != NULL, "mmcStopSequentialRead");
chSysLock();
if (mmcp->mmc_state != MMC_READING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
spiSend(mmcp->mmc_spip, sizeof(stopcmd), stopcmd);
/* result = recvr1(mmcp) != 0x00;*/
/* Note, ignored r1 response, it can be not zero, unknown issue.*/
recvr1(mmcp);
result = FALSE;
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_READING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return result;
}
/**
* @brief Starts a sequential write.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] startblk first block to write
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStartSequentialWrite(MMCDriver *mmcp, uint32_t startblk) {
chDbgCheck(mmcp != NULL, "mmcStartSequentialWrite");
chSysLock();
if (mmcp->mmc_state != MMC_READY) {
chSysUnlock();
return TRUE;
}
mmcp->mmc_state = MMC_WRITING;
chSysUnlock();
spiStart(mmcp->mmc_spip, mmcp->mmc_hscfg);
spiSelect(mmcp->mmc_spip);
send_hdr(mmcp, MMC_CMDWRITEMULTIPLE, startblk * MMC_SECTOR_SIZE);
if (recvr1(mmcp) != 0x00) {
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_WRITING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
return FALSE;
}
/**
* @brief Writes a block within a sequential write operation.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[out] buffer pointer to the write buffer
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcSequentialWrite(MMCDriver *mmcp, const uint8_t *buffer) {
static const uint8_t start[] = {0xFF, 0xFC};
uint8_t b[1];
chDbgCheck((mmcp != NULL) && (buffer != NULL), "mmcSequentialWrite");
chSysLock();
if (mmcp->mmc_state != MMC_WRITING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
spiSend(mmcp->mmc_spip, sizeof(start), start); /* Data prologue. */
spiSend(mmcp->mmc_spip, MMC_SECTOR_SIZE, buffer); /* Data. */
spiIgnore(mmcp->mmc_spip, 2); /* CRC ignored. */
spiReceive(mmcp->mmc_spip, 1, b);
if ((b[0] & 0x1F) == 0x05) {
wait(mmcp);
return FALSE;
}
/* Error.*/
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_WRITING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
/**
* @brief Stops a sequential write gracefully.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStopSequentialWrite(MMCDriver *mmcp) {
static const uint8_t stop[] = {0xFD, 0xFF};
chDbgCheck(mmcp != NULL, "mmcStopSequentialWrite");
chSysLock();
if (mmcp->mmc_state != MMC_WRITING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
spiSend(mmcp->mmc_spip, sizeof(stop), stop);
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_WRITING) {
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return FALSE;
}
chSysUnlock();
return TRUE;
}
#endif /* HAL_USE_MMC_SPI */
/** @} */
|