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/**
2
  ******************************************************************************
3
  * @file    stm32f1xx_ll_spi.c
4
  * @author  MCD Application Team
5
  * @brief   SPI LL module driver.
6
  ******************************************************************************
7
  * @attention
8
  *
9
  * Copyright (c) 2016 STMicroelectronics.
10
  * All rights reserved.
11
  *
12
  * This software is licensed under terms that can be found in the LICENSE file
13
  * in the root directory of this software component.
14
  * If no LICENSE file comes with this software, it is provided AS-IS.
15
  *
16
  ******************************************************************************
17
  */
18
#if defined(USE_FULL_LL_DRIVER)
19
 
20
/* Includes ------------------------------------------------------------------*/
21
#include "stm32f1xx_ll_spi.h"
22
#include "stm32f1xx_ll_bus.h"
23
#include "stm32f1xx_ll_rcc.h"
24
 
25
#ifdef  USE_FULL_ASSERT
26
#include "stm32_assert.h"
27
#else
28
#define assert_param(expr) ((void)0U)
29
#endif /* USE_FULL_ASSERT */
30
 
31
/** @addtogroup STM32F1xx_LL_Driver
32
  * @{
33
  */
34
 
35
#if defined (SPI1) || defined (SPI2) || defined (SPI3)
36
 
37
/** @addtogroup SPI_LL
38
  * @{
39
  */
40
 
41
/* Private types -------------------------------------------------------------*/
42
/* Private variables ---------------------------------------------------------*/
43
 
44
/* Private constants ---------------------------------------------------------*/
45
/** @defgroup SPI_LL_Private_Constants SPI Private Constants
46
  * @{
47
  */
48
/* SPI registers Masks */
49
#define SPI_CR1_CLEAR_MASK                 (SPI_CR1_CPHA    | SPI_CR1_CPOL     | SPI_CR1_MSTR   | \
50
                                            SPI_CR1_BR      | SPI_CR1_LSBFIRST | SPI_CR1_SSI    | \
51
                                            SPI_CR1_SSM     | SPI_CR1_RXONLY   | SPI_CR1_DFF    | \
52
                                            SPI_CR1_CRCNEXT | SPI_CR1_CRCEN    | SPI_CR1_BIDIOE | \
53
                                            SPI_CR1_BIDIMODE)
54
/**
55
  * @}
56
  */
57
 
58
/* Private macros ------------------------------------------------------------*/
59
/** @defgroup SPI_LL_Private_Macros SPI Private Macros
60
  * @{
61
  */
62
#define IS_LL_SPI_TRANSFER_DIRECTION(__VALUE__) (((__VALUE__) == LL_SPI_FULL_DUPLEX)       \
63
                                                 || ((__VALUE__) == LL_SPI_SIMPLEX_RX)     \
64
                                                 || ((__VALUE__) == LL_SPI_HALF_DUPLEX_RX) \
65
                                                 || ((__VALUE__) == LL_SPI_HALF_DUPLEX_TX))
66
 
67
#define IS_LL_SPI_MODE(__VALUE__) (((__VALUE__) == LL_SPI_MODE_MASTER) \
68
                                   || ((__VALUE__) == LL_SPI_MODE_SLAVE))
69
 
70
#define IS_LL_SPI_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_SPI_DATAWIDTH_8BIT)  \
71
                                        || ((__VALUE__) == LL_SPI_DATAWIDTH_16BIT))
72
 
73
#define IS_LL_SPI_POLARITY(__VALUE__) (((__VALUE__) == LL_SPI_POLARITY_LOW) \
74
                                       || ((__VALUE__) == LL_SPI_POLARITY_HIGH))
75
 
76
#define IS_LL_SPI_PHASE(__VALUE__) (((__VALUE__) == LL_SPI_PHASE_1EDGE) \
77
                                    || ((__VALUE__) == LL_SPI_PHASE_2EDGE))
78
 
79
#define IS_LL_SPI_NSS(__VALUE__) (((__VALUE__) == LL_SPI_NSS_SOFT)          \
80
                                  || ((__VALUE__) == LL_SPI_NSS_HARD_INPUT) \
81
                                  || ((__VALUE__) == LL_SPI_NSS_HARD_OUTPUT))
82
 
83
#define IS_LL_SPI_BAUDRATE(__VALUE__) (((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV2)      \
84
                                       || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV4)   \
85
                                       || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV8)   \
86
                                       || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV16)  \
87
                                       || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV32)  \
88
                                       || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV64)  \
89
                                       || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV128) \
90
                                       || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV256))
91
 
92
#define IS_LL_SPI_BITORDER(__VALUE__) (((__VALUE__) == LL_SPI_LSB_FIRST) \
93
                                       || ((__VALUE__) == LL_SPI_MSB_FIRST))
94
 
95
#define IS_LL_SPI_CRCCALCULATION(__VALUE__) (((__VALUE__) == LL_SPI_CRCCALCULATION_ENABLE) \
96
                                             || ((__VALUE__) == LL_SPI_CRCCALCULATION_DISABLE))
97
 
98
#define IS_LL_SPI_CRC_POLYNOMIAL(__VALUE__) ((__VALUE__) >= 0x1U)
99
 
100
/**
101
  * @}
102
  */
103
 
104
/* Private function prototypes -----------------------------------------------*/
105
 
106
/* Exported functions --------------------------------------------------------*/
107
/** @addtogroup SPI_LL_Exported_Functions
108
  * @{
109
  */
110
 
111
/** @addtogroup SPI_LL_EF_Init
112
  * @{
113
  */
114
 
115
/**
116
  * @brief  De-initialize the SPI registers to their default reset values.
117
  * @param  SPIx SPI Instance
118
  * @retval An ErrorStatus enumeration value:
119
  *          - SUCCESS: SPI registers are de-initialized
120
  *          - ERROR: SPI registers are not de-initialized
121
  */
122
ErrorStatus LL_SPI_DeInit(SPI_TypeDef *SPIx)
123
{
124
  ErrorStatus status = ERROR;
125
 
126
  /* Check the parameters */
127
  assert_param(IS_SPI_ALL_INSTANCE(SPIx));
128
 
129
#if defined(SPI1)
130
  if (SPIx == SPI1)
131
  {
132
    /* Force reset of SPI clock */
133
    LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_SPI1);
134
 
135
    /* Release reset of SPI clock */
136
    LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_SPI1);
137
 
138
    status = SUCCESS;
139
  }
140
#endif /* SPI1 */
141
#if defined(SPI2)
142
  if (SPIx == SPI2)
143
  {
144
    /* Force reset of SPI clock */
145
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI2);
146
 
147
    /* Release reset of SPI clock */
148
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI2);
149
 
150
    status = SUCCESS;
151
  }
152
#endif /* SPI2 */
153
#if defined(SPI3)
154
  if (SPIx == SPI3)
155
  {
156
    /* Force reset of SPI clock */
157
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI3);
158
 
159
    /* Release reset of SPI clock */
160
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI3);
161
 
162
    status = SUCCESS;
163
  }
164
#endif /* SPI3 */
165
 
166
  return status;
167
}
168
 
169
/**
170
  * @brief  Initialize the SPI registers according to the specified parameters in SPI_InitStruct.
171
  * @note   As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0),
172
  *         SPI peripheral should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
173
  * @param  SPIx SPI Instance
174
  * @param  SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure
175
  * @retval An ErrorStatus enumeration value. (Return always SUCCESS)
176
  */
177
ErrorStatus LL_SPI_Init(SPI_TypeDef *SPIx, LL_SPI_InitTypeDef *SPI_InitStruct)
178
{
179
  ErrorStatus status = ERROR;
180
 
181
  /* Check the SPI Instance SPIx*/
182
  assert_param(IS_SPI_ALL_INSTANCE(SPIx));
183
 
184
  /* Check the SPI parameters from SPI_InitStruct*/
185
  assert_param(IS_LL_SPI_TRANSFER_DIRECTION(SPI_InitStruct->TransferDirection));
186
  assert_param(IS_LL_SPI_MODE(SPI_InitStruct->Mode));
187
  assert_param(IS_LL_SPI_DATAWIDTH(SPI_InitStruct->DataWidth));
188
  assert_param(IS_LL_SPI_POLARITY(SPI_InitStruct->ClockPolarity));
189
  assert_param(IS_LL_SPI_PHASE(SPI_InitStruct->ClockPhase));
190
  assert_param(IS_LL_SPI_NSS(SPI_InitStruct->NSS));
191
  assert_param(IS_LL_SPI_BAUDRATE(SPI_InitStruct->BaudRate));
192
  assert_param(IS_LL_SPI_BITORDER(SPI_InitStruct->BitOrder));
193
  assert_param(IS_LL_SPI_CRCCALCULATION(SPI_InitStruct->CRCCalculation));
194
 
195
  if (LL_SPI_IsEnabled(SPIx) == 0x00000000U)
196
  {
197
    /*---------------------------- SPIx CR1 Configuration ------------------------
198
     * Configure SPIx CR1 with parameters:
199
     * - TransferDirection:  SPI_CR1_BIDIMODE, SPI_CR1_BIDIOE and SPI_CR1_RXONLY bits
200
     * - Master/Slave Mode:  SPI_CR1_MSTR bit
201
     * - DataWidth:          SPI_CR1_DFF bit
202
     * - ClockPolarity:      SPI_CR1_CPOL bit
203
     * - ClockPhase:         SPI_CR1_CPHA bit
204
     * - NSS management:     SPI_CR1_SSM bit
205
     * - BaudRate prescaler: SPI_CR1_BR[2:0] bits
206
     * - BitOrder:           SPI_CR1_LSBFIRST bit
207
     * - CRCCalculation:     SPI_CR1_CRCEN bit
208
     */
209
    MODIFY_REG(SPIx->CR1,
210
               SPI_CR1_CLEAR_MASK,
211
               SPI_InitStruct->TransferDirection | SPI_InitStruct->Mode | SPI_InitStruct->DataWidth |
212
               SPI_InitStruct->ClockPolarity | SPI_InitStruct->ClockPhase |
213
               SPI_InitStruct->NSS | SPI_InitStruct->BaudRate |
214
               SPI_InitStruct->BitOrder | SPI_InitStruct->CRCCalculation);
215
 
216
    /*---------------------------- SPIx CR2 Configuration ------------------------
217
     * Configure SPIx CR2 with parameters:
218
     * - NSS management:     SSOE bit
219
     */
220
    MODIFY_REG(SPIx->CR2, SPI_CR2_SSOE, (SPI_InitStruct->NSS >> 16U));
221
 
222
    /*---------------------------- SPIx CRCPR Configuration ----------------------
223
     * Configure SPIx CRCPR with parameters:
224
     * - CRCPoly:            CRCPOLY[15:0] bits
225
     */
226
    if (SPI_InitStruct->CRCCalculation == LL_SPI_CRCCALCULATION_ENABLE)
227
    {
228
      assert_param(IS_LL_SPI_CRC_POLYNOMIAL(SPI_InitStruct->CRCPoly));
229
      LL_SPI_SetCRCPolynomial(SPIx, SPI_InitStruct->CRCPoly);
230
    }
231
    status = SUCCESS;
232
  }
233
 
234
#if defined (SPI_I2S_SUPPORT)
235
  /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
236
  CLEAR_BIT(SPIx->I2SCFGR, SPI_I2SCFGR_I2SMOD);
237
#endif /* SPI_I2S_SUPPORT */
238
  return status;
239
}
240
 
241
/**
242
  * @brief  Set each @ref LL_SPI_InitTypeDef field to default value.
243
  * @param  SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure
244
  * whose fields will be set to default values.
245
  * @retval None
246
  */
247
void LL_SPI_StructInit(LL_SPI_InitTypeDef *SPI_InitStruct)
248
{
249
  /* Set SPI_InitStruct fields to default values */
250
  SPI_InitStruct->TransferDirection = LL_SPI_FULL_DUPLEX;
251
  SPI_InitStruct->Mode              = LL_SPI_MODE_SLAVE;
252
  SPI_InitStruct->DataWidth         = LL_SPI_DATAWIDTH_8BIT;
253
  SPI_InitStruct->ClockPolarity     = LL_SPI_POLARITY_LOW;
254
  SPI_InitStruct->ClockPhase        = LL_SPI_PHASE_1EDGE;
255
  SPI_InitStruct->NSS               = LL_SPI_NSS_HARD_INPUT;
256
  SPI_InitStruct->BaudRate          = LL_SPI_BAUDRATEPRESCALER_DIV2;
257
  SPI_InitStruct->BitOrder          = LL_SPI_MSB_FIRST;
258
  SPI_InitStruct->CRCCalculation    = LL_SPI_CRCCALCULATION_DISABLE;
259
  SPI_InitStruct->CRCPoly           = 7U;
260
}
261
 
262
/**
263
  * @}
264
  */
265
 
266
/**
267
  * @}
268
  */
269
 
270
/**
271
  * @}
272
  */
273
 
274
#if defined(SPI_I2S_SUPPORT)
275
/** @addtogroup I2S_LL
276
  * @{
277
  */
278
 
279
/* Private types -------------------------------------------------------------*/
280
/* Private variables ---------------------------------------------------------*/
281
/* Private constants ---------------------------------------------------------*/
282
/** @defgroup I2S_LL_Private_Constants I2S Private Constants
283
  * @{
284
  */
285
/* I2S registers Masks */
286
#define I2S_I2SCFGR_CLEAR_MASK             (SPI_I2SCFGR_CHLEN   | SPI_I2SCFGR_DATLEN | \
287
                                            SPI_I2SCFGR_CKPOL   | SPI_I2SCFGR_I2SSTD | \
288
                                            SPI_I2SCFGR_I2SCFG  | SPI_I2SCFGR_I2SMOD )
289
 
290
#define I2S_I2SPR_CLEAR_MASK               0x0002U
291
/**
292
  * @}
293
  */
294
/* Private macros ------------------------------------------------------------*/
295
/** @defgroup I2S_LL_Private_Macros I2S Private Macros
296
  * @{
297
  */
298
 
299
#define IS_LL_I2S_DATAFORMAT(__VALUE__)  (((__VALUE__) == LL_I2S_DATAFORMAT_16B)             \
300
                                          || ((__VALUE__) == LL_I2S_DATAFORMAT_16B_EXTENDED) \
301
                                          || ((__VALUE__) == LL_I2S_DATAFORMAT_24B)          \
302
                                          || ((__VALUE__) == LL_I2S_DATAFORMAT_32B))
303
 
304
#define IS_LL_I2S_CPOL(__VALUE__)        (((__VALUE__) == LL_I2S_POLARITY_LOW)  \
305
                                          || ((__VALUE__) == LL_I2S_POLARITY_HIGH))
306
 
307
#define IS_LL_I2S_STANDARD(__VALUE__)    (((__VALUE__) == LL_I2S_STANDARD_PHILIPS)      \
308
                                          || ((__VALUE__) == LL_I2S_STANDARD_MSB)       \
309
                                          || ((__VALUE__) == LL_I2S_STANDARD_LSB)       \
310
                                          || ((__VALUE__) == LL_I2S_STANDARD_PCM_SHORT) \
311
                                          || ((__VALUE__) == LL_I2S_STANDARD_PCM_LONG))
312
 
313
#define IS_LL_I2S_MODE(__VALUE__)        (((__VALUE__) == LL_I2S_MODE_SLAVE_TX)     \
314
                                          || ((__VALUE__) == LL_I2S_MODE_SLAVE_RX)  \
315
                                          || ((__VALUE__) == LL_I2S_MODE_MASTER_TX) \
316
                                          || ((__VALUE__) == LL_I2S_MODE_MASTER_RX))
317
 
318
#define IS_LL_I2S_MCLK_OUTPUT(__VALUE__) (((__VALUE__) == LL_I2S_MCLK_OUTPUT_ENABLE) \
319
                                          || ((__VALUE__) == LL_I2S_MCLK_OUTPUT_DISABLE))
320
 
321
#define IS_LL_I2S_AUDIO_FREQ(__VALUE__) ((((__VALUE__) >= LL_I2S_AUDIOFREQ_8K)       \
322
                                          && ((__VALUE__) <= LL_I2S_AUDIOFREQ_192K)) \
323
                                         || ((__VALUE__) == LL_I2S_AUDIOFREQ_DEFAULT))
324
 
325
#define IS_LL_I2S_PRESCALER_LINEAR(__VALUE__)  ((__VALUE__) >= 0x2U)
326
 
327
#define IS_LL_I2S_PRESCALER_PARITY(__VALUE__) (((__VALUE__) == LL_I2S_PRESCALER_PARITY_EVEN) \
328
                                               || ((__VALUE__) == LL_I2S_PRESCALER_PARITY_ODD))
329
/**
330
  * @}
331
  */
332
 
333
/* Private function prototypes -----------------------------------------------*/
334
 
335
/* Exported functions --------------------------------------------------------*/
336
/** @addtogroup I2S_LL_Exported_Functions
337
  * @{
338
  */
339
 
340
/** @addtogroup I2S_LL_EF_Init
341
  * @{
342
  */
343
 
344
/**
345
  * @brief  De-initialize the SPI/I2S registers to their default reset values.
346
  * @param  SPIx SPI Instance
347
  * @retval An ErrorStatus enumeration value:
348
  *          - SUCCESS: SPI registers are de-initialized
349
  *          - ERROR: SPI registers are not de-initialized
350
  */
351
ErrorStatus LL_I2S_DeInit(SPI_TypeDef *SPIx)
352
{
353
  return LL_SPI_DeInit(SPIx);
354
}
355
 
356
/**
357
  * @brief  Initializes the SPI/I2S registers according to the specified parameters in I2S_InitStruct.
358
  * @note   As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0),
359
  *         SPI peripheral should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
360
  * @param  SPIx SPI Instance
361
  * @param  I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure
362
  * @retval An ErrorStatus enumeration value:
363
  *          - SUCCESS: SPI registers are Initialized
364
  *          - ERROR: SPI registers are not Initialized
365
  */
366
ErrorStatus LL_I2S_Init(SPI_TypeDef *SPIx, LL_I2S_InitTypeDef *I2S_InitStruct)
367
{
368
  uint32_t i2sdiv = 2U;
369
  uint32_t i2sodd = 0U;
370
  uint32_t packetlength = 1U;
371
  uint32_t tmp;
372
  LL_RCC_ClocksTypeDef rcc_clocks;
373
  uint32_t sourceclock;
374
  ErrorStatus status = ERROR;
375
 
376
  /* Check the I2S parameters */
377
  assert_param(IS_I2S_ALL_INSTANCE(SPIx));
378
  assert_param(IS_LL_I2S_MODE(I2S_InitStruct->Mode));
379
  assert_param(IS_LL_I2S_STANDARD(I2S_InitStruct->Standard));
380
  assert_param(IS_LL_I2S_DATAFORMAT(I2S_InitStruct->DataFormat));
381
  assert_param(IS_LL_I2S_MCLK_OUTPUT(I2S_InitStruct->MCLKOutput));
382
  assert_param(IS_LL_I2S_AUDIO_FREQ(I2S_InitStruct->AudioFreq));
383
  assert_param(IS_LL_I2S_CPOL(I2S_InitStruct->ClockPolarity));
384
 
385
  if (LL_I2S_IsEnabled(SPIx) == 0x00000000U)
386
  {
387
    /*---------------------------- SPIx I2SCFGR Configuration --------------------
388
     * Configure SPIx I2SCFGR with parameters:
389
     * - Mode:          SPI_I2SCFGR_I2SCFG[1:0] bit
390
     * - Standard:      SPI_I2SCFGR_I2SSTD[1:0] and SPI_I2SCFGR_PCMSYNC bits
391
     * - DataFormat:    SPI_I2SCFGR_CHLEN and SPI_I2SCFGR_DATLEN bits
392
     * - ClockPolarity: SPI_I2SCFGR_CKPOL bit
393
     */
394
 
395
    /* Write to SPIx I2SCFGR */
396
    MODIFY_REG(SPIx->I2SCFGR,
397
               I2S_I2SCFGR_CLEAR_MASK,
398
               I2S_InitStruct->Mode | I2S_InitStruct->Standard |
399
               I2S_InitStruct->DataFormat | I2S_InitStruct->ClockPolarity |
400
               SPI_I2SCFGR_I2SMOD);
401
 
402
    /*---------------------------- SPIx I2SPR Configuration ----------------------
403
     * Configure SPIx I2SPR with parameters:
404
     * - MCLKOutput:    SPI_I2SPR_MCKOE bit
405
     * - AudioFreq:     SPI_I2SPR_I2SDIV[7:0] and SPI_I2SPR_ODD bits
406
     */
407
 
408
    /* If the requested audio frequency is not the default, compute the prescaler (i2sodd, i2sdiv)
409
     * else, default values are used:  i2sodd = 0U, i2sdiv = 2U.
410
     */
411
    if (I2S_InitStruct->AudioFreq != LL_I2S_AUDIOFREQ_DEFAULT)
412
    {
413
      /* Check the frame length (For the Prescaler computing)
414
       * Default value: LL_I2S_DATAFORMAT_16B (packetlength = 1U).
415
       */
416
      if (I2S_InitStruct->DataFormat != LL_I2S_DATAFORMAT_16B)
417
      {
418
        /* Packet length is 32 bits */
419
        packetlength = 2U;
420
      }
421
 
422
      /* I2S Clock source is System clock: Get System Clock frequency */
423
      LL_RCC_GetSystemClocksFreq(&rcc_clocks);
424
 
425
      /* Get the source clock value: based on System Clock value */
426
      sourceclock = rcc_clocks.SYSCLK_Frequency;
427
 
428
      /* Compute the Real divider depending on the MCLK output state with a floating point */
429
      if (I2S_InitStruct->MCLKOutput == LL_I2S_MCLK_OUTPUT_ENABLE)
430
      {
431
        /* MCLK output is enabled */
432
        tmp = (((((sourceclock / 256U) * 10U) / I2S_InitStruct->AudioFreq)) + 5U);
433
      }
434
      else
435
      {
436
        /* MCLK output is disabled */
437
        tmp = (((((sourceclock / (32U * packetlength)) * 10U) / I2S_InitStruct->AudioFreq)) + 5U);
438
      }
439
 
440
      /* Remove the floating point */
441
      tmp = tmp / 10U;
442
 
443
      /* Check the parity of the divider */
444
      i2sodd = (tmp & (uint16_t)0x0001U);
445
 
446
      /* Compute the i2sdiv prescaler */
447
      i2sdiv = ((tmp - i2sodd) / 2U);
448
 
449
      /* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
450
      i2sodd = (i2sodd << 8U);
451
    }
452
 
453
    /* Test if the divider is 1 or 0 or greater than 0xFF */
454
    if ((i2sdiv < 2U) || (i2sdiv > 0xFFU))
455
    {
456
      /* Set the default values */
457
      i2sdiv = 2U;
458
      i2sodd = 0U;
459
    }
460
 
461
    /* Write to SPIx I2SPR register the computed value */
462
    WRITE_REG(SPIx->I2SPR, i2sdiv | i2sodd | I2S_InitStruct->MCLKOutput);
463
 
464
    status = SUCCESS;
465
  }
466
  return status;
467
}
468
 
469
/**
470
  * @brief  Set each @ref LL_I2S_InitTypeDef field to default value.
471
  * @param  I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure
472
  *         whose fields will be set to default values.
473
  * @retval None
474
  */
475
void LL_I2S_StructInit(LL_I2S_InitTypeDef *I2S_InitStruct)
476
{
477
  /*--------------- Reset I2S init structure parameters values -----------------*/
478
  I2S_InitStruct->Mode              = LL_I2S_MODE_SLAVE_TX;
479
  I2S_InitStruct->Standard          = LL_I2S_STANDARD_PHILIPS;
480
  I2S_InitStruct->DataFormat        = LL_I2S_DATAFORMAT_16B;
481
  I2S_InitStruct->MCLKOutput        = LL_I2S_MCLK_OUTPUT_DISABLE;
482
  I2S_InitStruct->AudioFreq         = LL_I2S_AUDIOFREQ_DEFAULT;
483
  I2S_InitStruct->ClockPolarity     = LL_I2S_POLARITY_LOW;
484
}
485
 
486
/**
487
  * @brief  Set linear and parity prescaler.
488
  * @note   To calculate value of PrescalerLinear(I2SDIV[7:0] bits) and PrescalerParity(ODD bit)\n
489
  *         Check Audio frequency table and formulas inside Reference Manual (SPI/I2S).
490
  * @param  SPIx SPI Instance
491
  * @param  PrescalerLinear value Min_Data=0x02 and Max_Data=0xFF.
492
  * @param  PrescalerParity This parameter can be one of the following values:
493
  *         @arg @ref LL_I2S_PRESCALER_PARITY_EVEN
494
  *         @arg @ref LL_I2S_PRESCALER_PARITY_ODD
495
  * @retval None
496
  */
497
void LL_I2S_ConfigPrescaler(SPI_TypeDef *SPIx, uint32_t PrescalerLinear, uint32_t PrescalerParity)
498
{
499
  /* Check the I2S parameters */
500
  assert_param(IS_I2S_ALL_INSTANCE(SPIx));
501
  assert_param(IS_LL_I2S_PRESCALER_LINEAR(PrescalerLinear));
502
  assert_param(IS_LL_I2S_PRESCALER_PARITY(PrescalerParity));
503
 
504
  /* Write to SPIx I2SPR */
505
  MODIFY_REG(SPIx->I2SPR, SPI_I2SPR_I2SDIV | SPI_I2SPR_ODD, PrescalerLinear | (PrescalerParity << 8U));
506
}
507
 
508
/**
509
  * @}
510
  */
511
 
512
/**
513
  * @}
514
  */
515
 
516
/**
517
  * @}
518
  */
519
#endif /* SPI_I2S_SUPPORT */
520
 
521
#endif /* defined (SPI1) || defined (SPI2) || defined (SPI3) */
522
 
523
/**
524
  * @}
525
  */
526
 
527
#endif /* USE_FULL_LL_DRIVER */
528