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   1 /*
   2  * Copyright © 2012 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; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include <ao.h>
  20
  21 struct ao_spi_stm_info {
  22         uint8_t miso_dma_index;
  23         uint8_t mosi_dma_index;
  24         struct stm_spi *stm_spi;
  25 };
  26
  27 static uint8_t          ao_spi_mutex[STM_NUM_SPI];
  28 static uint8_t          ao_spi_pin_config[STM_NUM_SPI];
  29
  30 static const struct ao_spi_stm_info ao_spi_stm_info[STM_NUM_SPI] = {
  31         {
  32                 .miso_dma_index = STM_DMA_INDEX(STM_DMA_CHANNEL_SPI1_RX),
  33                 .mosi_dma_index = STM_DMA_INDEX(STM_DMA_CHANNEL_SPI1_TX),
  34                 &stm_spi1
  35         },
  36         {
  37                 .miso_dma_index = STM_DMA_INDEX(STM_DMA_CHANNEL_SPI2_RX),
  38                 .mosi_dma_index = STM_DMA_INDEX(STM_DMA_CHANNEL_SPI2_TX),
  39                 &stm_spi2
  40         }
  41 };
  42
  43 static uint8_t  spi_dev_null;
  44
  45 #if DEBUG
  46 static struct {
  47         uint8_t task;
  48         uint8_t which;
  49         AO_TICK_TYPE tick;
  50         uint16_t len;
  51 } spi_tasks[64];
  52 static uint8_t  spi_task_index;
  53
  54 static void
  55 validate_spi(struct stm_spi *stm_spi, int which, uint16_t len)
  56 {
  57         uint32_t        sr = stm_spi->sr;
  58
  59         if (stm_spi != &stm_spi2)
  60                 return;
  61         spi_tasks[spi_task_index].task = ao_cur_task ? ao_cur_task->task_id : 0;
  62         spi_tasks[spi_task_index].which = which;
  63         spi_tasks[spi_task_index].tick = ao_time();
  64         spi_tasks[spi_task_index].len = len;
  65         spi_task_index = (spi_task_index + 1) & (63);
  66         if (sr & (1 << STM_SPI_SR_FRE))
  67                 ao_panic(0x40 | 1);
  68         if (sr & (1 << STM_SPI_SR_BSY))
  69                 ao_panic(0x40 | 2);
  70         if (sr & (1 << STM_SPI_SR_OVR))
  71                 ao_panic(0x40 | 3);
  72         if (sr & (1 << STM_SPI_SR_MODF))
  73                 ao_panic(0x40 | 4);
  74         if (sr & (1 << STM_SPI_SR_UDR))
  75                 ao_panic(0x40 | 5);
  76         if ((sr & (1 << STM_SPI_SR_TXE)) == 0)
  77                 ao_panic(0x40 | 6);
  78         if (sr & (1 << STM_SPI_SR_RXNE))
  79                 ao_panic(0x40 | 7);
  80         if (which != 5 && which != 6 && which != 13)
  81                 if (ao_cur_task->task_id != ao_spi_mutex[1])
  82                         ao_panic(0x40 | 8);
  83 }
  84 #else
  85 #define validate_spi(stm_spi, which, len) do { (void) (which); (void) (len); } while (0)
  86 #endif
  87
  88 static void
  89 ao_spi_set_dma_mosi(uint8_t id, const void *data, uint16_t len, uint32_t minc)
  90 {
  91         struct stm_spi *stm_spi = ao_spi_stm_info[id].stm_spi;
  92         uint8_t mosi_dma_index = ao_spi_stm_info[id].mosi_dma_index;
  93
  94         ao_dma_set_transfer(mosi_dma_index,
  95                             &stm_spi->dr,
  96                             (void *) data,
  97                             len,
  98                             (0 << STM_DMA_CCR_MEM2MEM) |
  99                             (STM_DMA_CCR_PL_MEDIUM << STM_DMA_CCR_PL) |
 100                             (STM_DMA_CCR_MSIZE_8 << STM_DMA_CCR_MSIZE) |
 101                             (STM_DMA_CCR_PSIZE_8 << STM_DMA_CCR_PSIZE) |
 102                             (minc << STM_DMA_CCR_MINC) |
 103                             (0 << STM_DMA_CCR_PINC) |
 104                             (0 << STM_DMA_CCR_CIRC) |
 105                             (STM_DMA_CCR_DIR_MEM_TO_PER << STM_DMA_CCR_DIR));
 106 }
 107
 108 static void
 109 ao_spi_set_dma_miso(uint8_t id, void *data, uint16_t len, uint32_t minc)
 110 {
 111         struct stm_spi *stm_spi = ao_spi_stm_info[id].stm_spi;
 112         uint8_t miso_dma_index = ao_spi_stm_info[id].miso_dma_index;
 113
 114         ao_dma_set_transfer(miso_dma_index,
 115                             &stm_spi->dr,
 116                             data,
 117                             len,
 118                             (0 << STM_DMA_CCR_MEM2MEM) |
 119                             (STM_DMA_CCR_PL_VERY_HIGH << STM_DMA_CCR_PL) |
 120                             (STM_DMA_CCR_MSIZE_8 << STM_DMA_CCR_MSIZE) |
 121                             (STM_DMA_CCR_PSIZE_8 << STM_DMA_CCR_PSIZE) |
 122                             (minc << STM_DMA_CCR_MINC) |
 123                             (0 << STM_DMA_CCR_PINC) |
 124                             (0 << STM_DMA_CCR_CIRC) |
 125                             (STM_DMA_CCR_DIR_PER_TO_MEM << STM_DMA_CCR_DIR));
 126 }
 127
 128 static void
 129 ao_spi_run(uint8_t id, uint8_t which, uint16_t len)
 130 {
 131         struct stm_spi *stm_spi = ao_spi_stm_info[id].stm_spi;
 132         uint8_t mosi_dma_index = ao_spi_stm_info[id].mosi_dma_index;
 133         uint8_t miso_dma_index = ao_spi_stm_info[id].miso_dma_index;
 134
 135         validate_spi(stm_spi, which, len);
 136
 137         stm_spi->cr2 = ((0 << STM_SPI_CR2_TXEIE) |
 138                         (0 << STM_SPI_CR2_RXNEIE) |
 139                         (0 << STM_SPI_CR2_ERRIE) |
 140                         (0 << STM_SPI_CR2_SSOE) |
 141                         (1 << STM_SPI_CR2_TXDMAEN) |
 142                         (1 << STM_SPI_CR2_RXDMAEN));
 143
 144         ao_dma_start(miso_dma_index);
 145         ao_dma_start(mosi_dma_index);
 146
 147         ao_arch_critical(
 148                 while (!ao_dma_done[miso_dma_index])
 149                         ao_sleep(&ao_dma_done[miso_dma_index]);
 150                 );
 151
 152         while ((stm_spi->sr & (1 << STM_SPI_SR_TXE)) == 0);
 153         while (stm_spi->sr & (1 << STM_SPI_SR_BSY));
 154
 155         validate_spi(stm_spi, which+1, len);
 156
 157         stm_spi->cr2 = 0;
 158
 159         ao_dma_done_transfer(mosi_dma_index);
 160         ao_dma_done_transfer(miso_dma_index);
 161 }
 162
 163 void
 164 ao_spi_send(const void *block, uint16_t len, uint8_t spi_index)
 165 {
 166         uint8_t id = AO_SPI_INDEX(spi_index);
 167
 168         /* Set up the transmit DMA to deliver data */
 169         ao_spi_set_dma_mosi(id, block, len, 1);
 170
 171         /* Set up the receive DMA -- when this is done, we know the SPI unit
 172          * is idle. Without this, we'd have to poll waiting for the BSY bit to
 173          * be cleared
 174          */
 175         ao_spi_set_dma_miso(id, &spi_dev_null, len, 0);
 176
 177         ao_spi_run(id, 1, len);
 178 }
 179
 180 void
 181 ao_spi_send_fixed(uint8_t value, uint16_t len, uint8_t spi_index)
 182 {
 183         uint8_t id = AO_SPI_INDEX(spi_index);
 184
 185         /* Set up the transmit DMA to deliver data */
 186         ao_spi_set_dma_mosi(id, &value, len, 0);
 187
 188         /* Set up the receive DMA -- when this is done, we know the SPI unit
 189          * is idle. Without this, we'd have to poll waiting for the BSY bit to
 190          * be cleared
 191          */
 192         ao_spi_set_dma_miso(id, &spi_dev_null, len, 0);
 193
 194         ao_spi_run(id, 3, len);
 195 }
 196
 197 void
 198 ao_spi_start_bytes(uint8_t spi_index)
 199 {
 200         uint8_t         id = AO_SPI_INDEX(spi_index);
 201         struct stm_spi  *stm_spi = ao_spi_stm_info[id].stm_spi;
 202
 203         stm_spi->cr2 = ((0 << STM_SPI_CR2_TXEIE) |
 204                         (0 << STM_SPI_CR2_RXNEIE) |
 205                         (0 << STM_SPI_CR2_ERRIE) |
 206                         (0 << STM_SPI_CR2_SSOE) |
 207                         (0 << STM_SPI_CR2_TXDMAEN) |
 208                         (0 << STM_SPI_CR2_RXDMAEN));
 209         validate_spi(stm_spi, 5, 0xffff);
 210 }
 211
 212 void
 213 ao_spi_stop_bytes(uint8_t spi_index)
 214 {
 215         uint8_t         id = AO_SPI_INDEX(spi_index);
 216         struct stm_spi  *stm_spi = ao_spi_stm_info[id].stm_spi;
 217
 218         while ((stm_spi->sr & (1 << STM_SPI_SR_TXE)) == 0)
 219                 ;
 220         while (stm_spi->sr & (1 << STM_SPI_SR_BSY))
 221                 ;
 222         /* Clear the OVR flag */
 223         (void) stm_spi->dr;
 224         (void) stm_spi->sr;
 225         validate_spi(stm_spi, 6, 0xffff);
 226         stm_spi->cr2 = 0;
 227 }
 228
 229 void
 230 ao_spi_send_sync(const void *block, uint16_t len, uint8_t spi_index)
 231 {
 232         uint8_t         id = AO_SPI_INDEX(spi_index);
 233         const uint8_t   *b = block;
 234         struct stm_spi  *stm_spi = ao_spi_stm_info[id].stm_spi;
 235
 236         stm_spi->cr2 = ((0 << STM_SPI_CR2_TXEIE) |
 237                         (0 << STM_SPI_CR2_RXNEIE) |
 238                         (0 << STM_SPI_CR2_ERRIE) |
 239                         (0 << STM_SPI_CR2_SSOE) |
 240                         (0 << STM_SPI_CR2_TXDMAEN) |
 241                         (0 << STM_SPI_CR2_RXDMAEN));
 242         validate_spi(stm_spi, 7, len);
 243         while (len--) {
 244                 while (!(stm_spi->sr & (1 << STM_SPI_SR_TXE)));
 245                 stm_spi->dr = *b++;
 246         }
 247         while ((stm_spi->sr & (1 << STM_SPI_SR_TXE)) == 0)
 248                 ;
 249         while (stm_spi->sr & (1 << STM_SPI_SR_BSY))
 250                 ;
 251         /* Clear the OVR flag */
 252         (void) stm_spi->dr;
 253         (void) stm_spi->sr;
 254         validate_spi(stm_spi, 8, len);
 255 }
 256
 257 void
 258 ao_spi_recv(void *block, uint16_t len, uint8_t spi_index)
 259 {
 260         uint8_t         id = AO_SPI_INDEX(spi_index);
 261
 262         spi_dev_null = 0xff;
 263
 264         /* Set up transmit DMA to make the SPI hardware actually run */
 265         ao_spi_set_dma_mosi(id, &spi_dev_null, len, 0);
 266
 267         /* Set up the receive DMA to capture data */
 268         ao_spi_set_dma_miso(id, block, len, 1);
 269
 270         ao_spi_run(id, 9, len);
 271 }
 272
 273 void
 274 ao_spi_duplex(const void *out, void *in, uint16_t len, uint8_t spi_index)
 275 {
 276         uint8_t         id = AO_SPI_INDEX(spi_index);
 277
 278         /* Set up transmit DMA to send data */
 279         ao_spi_set_dma_mosi(id, out, len, 1);
 280
 281         /* Set up the receive DMA to capture data */
 282         ao_spi_set_dma_miso(id, in, len, 1);
 283
 284         ao_spi_run(id, 11, len);
 285 }
 286
 287 #define stm_spi_input_disable(gpio, pin) do {                   \
 288                 stm_gpio_conf(gpio, pin,                        \
 289                               STM_GPIO_CR_MODE_INPUT,           \
 290                               STM_GPIO_CR_CNF_INPUT_FLOATING);  \
 291         } while(0)
 292
 293 #define stm_spi_output_disable(gpio, pin, mode) do {                    \
 294                 ao_gpio_set(gpio, pin, 1);                              \
 295                 stm_gpio_conf(gpio, pin,                                \
 296                               mode,                                     \
 297                               STM_GPIO_CR_CNF_OUTPUT_PUSH_PULL);        \
 298         } while(0)
 299
 300 static void
 301 ao_spi_disable_pin_config(uint8_t spi_pin_config)
 302 {
 303         /* Disable current config
 304          */
 305         switch (spi_pin_config) {
 306 #if SPI_1_PA5_PA6_PA7
 307         case AO_SPI_1_PA5_PA6_PA7:
 308                 stm_spi_output_disable(&stm_gpioa, 5, SPI_1_MODE_OUTPUT);
 309 #ifndef SPI_1_PA6_DISABLE
 310                 stm_spi_input_disable(&stm_gpioa, 6);
 311 #endif
 312                 stm_spi_output_disable(&stm_gpioa, 7, SPI_1_MODE_OUTPUT);
 313                 break;
 314 #endif
 315 #if SPI_1_PB3_PB4_PB5
 316         case AO_SPI_1_PB3_PB4_PB5:
 317                 stm_spi_output_disable(&stm_gpiob, 3, SPI_1_MODE_OUTPUT);
 318                 stm_spi_input_disable(&stm_gpiob, 4);
 319                 stm_spi_output_disable(&stm_gpiob, 5, SPI_1_MODE_OUTPUT);
 320                 break;
 321 #endif
 322 #if SPI_2_PB13_PB14_PB15
 323         case AO_SPI_2_PB13_PB14_PB15:
 324                 stm_spi_output_disable(&stm_gpiob, 13, SPI_2_MODE_OUTPUT);
 325                 stm_spi_input_disable(&stm_gpiob, 14);
 326                 stm_spi_output_disable(&stm_gpiob, 15, SPI_2_MODE_OUTPUT);
 327                 break;
 328 #endif
 329         }
 330 }
 331
 332 #define stm_spi_input_enable(gpio, pin) do {                    \
 333                 stm_gpio_conf(gpio, pin,                        \
 334                               STM_GPIO_CR_MODE_INPUT,           \
 335                               STM_GPIO_CR_CNF_INPUT_FLOATING);  \
 336         } while(0)
 337
 338 #define stm_spi_output_enable(gpio, pin, mode) do {                     \
 339                 stm_gpio_conf(gpio, pin,                                \
 340                               mode,                                     \
 341                               STM_GPIO_CR_CNF_OUTPUT_AF_PUSH_PULL);     \
 342         } while(0)
 343
 344 static void
 345 ao_spi_enable_pin_config(uint8_t spi_pin_config)
 346 {
 347         /* Enable new config
 348          */
 349         switch (spi_pin_config) {
 350 #if SPI_1_PA5_PA6_PA7
 351         case AO_SPI_1_PA5_PA6_PA7:
 352                 stm_set_afio_mapr(STM_AFIO_MAPR_SPI1_REMAP,
 353                                   STM_AFIO_MAPR_SPI1_REMAP_PA4_PA5_PA6_PA7,
 354                                   STM_AFIO_MAPR_SPI1_REMAP_MASK);
 355                 stm_spi_output_enable(&stm_gpioa, 5, SPI_1_MODE_OUTPUT);
 356 #ifndef SPI_1_PA6_DISABLE
 357                 stm_spi_input_enable(&stm_gpioa, 6);
 358 #endif
 359                 stm_spi_output_enable(&stm_gpioa, 7, SPI_1_MODE_OUTPUT);
 360                 break;
 361 #endif
 362 #if SPI_1_PB3_PB4_PB5
 363         case AO_SPI_1_PB3_PB4_PB5:
 364                 stm_set_afio_mapr(STM_AFIO_MAPR_SPI1_REMAP,
 365                                   STM_AFIO_MAPR_SPI1_REMAP_PA15_PB3_PB4_PB5,
 366                                   STM_AFIO_MAPR_SPI1_REMAP_MASK);
 367                 stm_spi_output_enable(&stm_gpiob, 3, SPI_1_MODE_OUTPUT);
 368                 stm_spi_input_enable(&stm_gpiob, 4);
 369                 stm_spi_output_enable(&stm_gpiob, 5, SPI_1_MODE_OUTPUT);
 370                 break;
 371 #endif
 372 #if SPI_2_PB13_PB14_PB15
 373         case AO_SPI_2_PB13_PB14_PB15:
 374                 stm_spi_output_enable(&stm_gpiob, 13, SPI_2_MODE_OUTPUT);
 375                 stm_spi_input_enable(&stm_gpiob, 14);
 376                 stm_spi_output_enable(&stm_gpiob, 15, SPI_2_MODE_OUTPUT);
 377                 break;
 378 #endif
 379         }
 380 }
 381
 382 static void
 383 ao_spi_config(uint8_t spi_index, uint32_t speed)
 384 {
 385         uint8_t         spi_pin_config = AO_SPI_PIN_CONFIG(spi_index);
 386         uint8_t         id = AO_SPI_INDEX(spi_index);
 387         struct stm_spi  *stm_spi = ao_spi_stm_info[id].stm_spi;
 388
 389         if (spi_pin_config != ao_spi_pin_config[id]) {
 390
 391                 /* Disable old config
 392                  */
 393                 ao_spi_disable_pin_config(ao_spi_pin_config[id]);
 394
 395                 /* Enable new config
 396                  */
 397                 ao_spi_enable_pin_config(spi_pin_config);
 398
 399                 /* Remember current config
 400                  */
 401                 ao_spi_pin_config[id] = spi_pin_config;
 402         }
 403
 404         /* Turn the SPI transceiver on and set the mode */
 405         stm_spi->cr1 = ((0 << STM_SPI_CR1_BIDIMODE) |           /* Three wire mode */
 406                         (0 << STM_SPI_CR1_BIDIOE) |
 407                         (0 << STM_SPI_CR1_CRCEN) |              /* CRC disabled */
 408                         (0 << STM_SPI_CR1_CRCNEXT) |
 409                         (0 << STM_SPI_CR1_DFF) |
 410                         (0 << STM_SPI_CR1_RXONLY) |
 411                         (1 << STM_SPI_CR1_SSM) |                /* Software SS handling */
 412                         (1 << STM_SPI_CR1_SSI) |                /*  ... */
 413                         (0 << STM_SPI_CR1_LSBFIRST) |           /* Big endian */
 414                         (1 << STM_SPI_CR1_SPE) |                /* Enable SPI unit */
 415                         (speed << STM_SPI_CR1_BR) |             /* baud rate to pclk/4 */
 416                         (1 << STM_SPI_CR1_MSTR) |
 417                         (AO_SPI_CPOL(spi_index) << STM_SPI_CR1_CPOL) |  /* Format */
 418                         (AO_SPI_CPHA(spi_index) << STM_SPI_CR1_CPHA));
 419         validate_spi(stm_spi, 13, 0);
 420 }
 421
 422 uint8_t
 423 ao_spi_try_get(uint8_t spi_index, uint32_t speed, uint8_t task_id)
 424 {
 425         uint8_t         id = AO_SPI_INDEX(spi_index);
 426
 427         if (!ao_mutex_try(&ao_spi_mutex[id], task_id))
 428                 return 0;
 429         ao_spi_config(spi_index, speed);
 430         return 1;
 431 }
 432
 433 void
 434 ao_spi_get(uint8_t spi_index, uint32_t speed)
 435 {
 436         uint8_t         id = AO_SPI_INDEX(spi_index);
 437
 438         ao_mutex_get(&ao_spi_mutex[id]);
 439         ao_spi_config(spi_index, speed);
 440 }
 441
 442 void
 443 ao_spi_put(uint8_t spi_index)
 444 {
 445         uint8_t         id = AO_SPI_INDEX(spi_index);
 446         struct stm_spi  *stm_spi = ao_spi_stm_info[id].stm_spi;
 447
 448         stm_spi->cr1 = 0;
 449         ao_mutex_put(&ao_spi_mutex[id]);
 450 }
 451
 452 void
 453 ao_spi_put_pins(uint8_t spi_index)
 454 {
 455         uint8_t         id = AO_SPI_INDEX(spi_index);
 456
 457         ao_spi_disable_pin_config(ao_spi_pin_config[id]);
 458         ao_spi_pin_config[id] = AO_SPI_CONFIG_NONE;
 459         ao_spi_put(spi_index);
 460 }
 461
 462 static void
 463 ao_spi_channel_init(uint8_t spi_index)
 464 {
 465         uint8_t         id = AO_SPI_INDEX(spi_index);
 466         struct stm_spi  *stm_spi = ao_spi_stm_info[id].stm_spi;
 467
 468         ao_spi_disable_pin_config(AO_SPI_PIN_CONFIG(spi_index));
 469
 470         stm_spi->cr1 = 0;
 471         stm_spi->cr2 = ((0 << STM_SPI_CR2_TXEIE) |
 472                         (0 << STM_SPI_CR2_RXNEIE) |
 473                         (0 << STM_SPI_CR2_ERRIE) |
 474                         (0 << STM_SPI_CR2_SSOE) |
 475                         (0 << STM_SPI_CR2_TXDMAEN) |
 476                         (0 << STM_SPI_CR2_RXDMAEN));
 477
 478         /* Clear any pending data and error flags */
 479         (void) stm_spi->dr;
 480         (void) stm_spi->sr;
 481 }
 482
 483 #if DEBUG
 484 void
 485 ao_spi_dump_cmd(void)
 486 {
 487         int s;
 488
 489         for (s = 0; s < 64; s++) {
 490                 int i = (spi_task_index + s) & 63;
 491                 if (spi_tasks[i].which) {
 492                         int t;
 493                         const char *name = "(none)";
 494                         for (t = 0; t < ao_num_tasks; t++)
 495                                 if (ao_tasks[t]->task_id == spi_tasks[i].task) {
 496                                         name = ao_tasks[t]->name;
 497                                         break;
 498                                 }
 499                         printf("%2d: %5d task %2d which %2d len %5d %s\n",
 500                                s,
 501                                spi_tasks[i].tick,
 502                                spi_tasks[i].task,
 503                                spi_tasks[i].which,
 504                                spi_tasks[i].len,
 505                                name);
 506                 }
 507         }
 508         for (s = 0; s < STM_NUM_SPI; s++) {
 509                 struct stm_spi *spi = ao_spi_stm_info[s].stm_spi;
 510
 511                 printf("%1d: mutex %2d index %3d miso dma %3d mosi dma %3d",
 512                        s, ao_spi_mutex[s], ao_spi_index[s],
 513                        ao_spi_stm_info[s].miso_dma_index,
 514                        ao_spi_stm_info[s].mosi_dma_index);
 515                 printf(" cr1 %04x cr2 %02x sr %03x\n",
 516                        spi->cr1, spi->cr2, spi->sr);
 517         }
 518
 519 }
 520
 521 static const struct ao_cmds ao_spi_cmds[] = {
 522         { ao_spi_dump_cmd,      "S\0Dump SPI status" },
 523         { 0, NULL }
 524 };
 525 #endif
 526
 527 void
 528 ao_spi_init(void)
 529 {
 530 #if HAS_SPI_1
 531 # if SPI_1_PA5_PA6_PA7
 532         ao_enable_port(&stm_gpioa);
 533 # endif
 534 # if SPI_1_PB3_PB4_PB5
 535         ao_enable_port(&stm_gpiob);
 536 # endif
 537         stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SPI1EN);
 538         ao_spi_pin_config[0] = AO_SPI_CONFIG_NONE;
 539         ao_spi_channel_init(0);
 540 #endif
 541
 542 #if HAS_SPI_2
 543 # if SPI_2_PB13_PB14_PB15
 544         ao_enable_port(&stm_gpiob);
 545 # endif
 546         stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_SPI2EN);
 547         ao_spi_pin_config[1] = AO_SPI_CONFIG_NONE;
 548         ao_spi_channel_init(1);
 549 #endif
 550 #if DEBUG
 551         ao_cmd_register(&ao_spi_cmds[0]);
 552 #endif
 553 }