mbed official
mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_STM/TARGET_STM32F0/device/stm32f0xx_ll_spi.c
- Revision:
- 156:95d6b41a828b
- Child:
- 180:96ed750bd169
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F0/device/stm32f0xx_ll_spi.c Mon Jan 16 15:03:32 2017 +0000
@@ -0,0 +1,547 @@
+/**
+ ******************************************************************************
+ * @file stm32f0xx_ll_spi.c
+ * @author MCD Application Team
+ * @version V1.4.0
+ * @date 27-May-2016
+ * @brief SPI LL module driver.
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ */
+#if defined(USE_FULL_LL_DRIVER)
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f0xx_ll_spi.h"
+#include "stm32f0xx_ll_bus.h"
+#include "stm32f0xx_ll_rcc.h"
+
+#ifdef USE_FULL_ASSERT
+#include "stm32_assert.h"
+#else
+#define assert_param(expr) ((void)0U)
+#endif
+
+/** @addtogroup STM32F0xx_LL_Driver
+ * @{
+ */
+
+#if defined (SPI1) || defined (SPI2)
+
+/** @addtogroup SPI_LL
+ * @{
+ */
+
+/* Private types -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+
+/* Private constants ---------------------------------------------------------*/
+/** @defgroup SPI_LL_Private_Constants SPI Private Constants
+ * @{
+ */
+/* SPI registers Masks */
+#define SPI_CR1_CLEAR_MASK (SPI_CR1_CPHA | SPI_CR1_CPOL | SPI_CR1_MSTR | \
+ SPI_CR1_BR | SPI_CR1_LSBFIRST | SPI_CR1_SSI | \
+ SPI_CR1_SSM | SPI_CR1_RXONLY | SPI_CR1_CRCL | \
+ SPI_CR1_CRCNEXT | SPI_CR1_CRCEN | SPI_CR1_BIDIOE | \
+ SPI_CR1_BIDIMODE)
+/**
+ * @}
+ */
+
+/* Private macros ------------------------------------------------------------*/
+/** @defgroup SPI_LL_Private_Macros SPI Private Macros
+ * @{
+ */
+#define IS_LL_SPI_TRANSFER_DIRECTION(__VALUE__) (((__VALUE__) == LL_SPI_FULL_DUPLEX) \
+ || ((__VALUE__) == LL_SPI_SIMPLEX_RX) \
+ || ((__VALUE__) == LL_SPI_HALF_DUPLEX_RX) \
+ || ((__VALUE__) == LL_SPI_HALF_DUPLEX_TX))
+
+#define IS_LL_SPI_MODE(__VALUE__) (((__VALUE__) == LL_SPI_MODE_MASTER) \
+ || ((__VALUE__) == LL_SPI_MODE_SLAVE))
+
+#define IS_LL_SPI_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_SPI_DATAWIDTH_4BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_5BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_6BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_7BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_8BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_9BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_10BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_11BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_12BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_13BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_14BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_15BIT) \
+ || ((__VALUE__) == LL_SPI_DATAWIDTH_16BIT))
+
+#define IS_LL_SPI_POLARITY(__VALUE__) (((__VALUE__) == LL_SPI_POLARITY_LOW) \
+ || ((__VALUE__) == LL_SPI_POLARITY_HIGH))
+
+#define IS_LL_SPI_PHASE(__VALUE__) (((__VALUE__) == LL_SPI_PHASE_1EDGE) \
+ || ((__VALUE__) == LL_SPI_PHASE_2EDGE))
+
+#define IS_LL_SPI_NSS(__VALUE__) (((__VALUE__) == LL_SPI_NSS_SOFT) \
+ || ((__VALUE__) == LL_SPI_NSS_HARD_INPUT) \
+ || ((__VALUE__) == LL_SPI_NSS_HARD_OUTPUT))
+
+#define IS_LL_SPI_BAUDRATE(__VALUE__) (((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV2) \
+ || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV4) \
+ || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV8) \
+ || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV16) \
+ || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV32) \
+ || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV64) \
+ || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV128) \
+ || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV256))
+
+#define IS_LL_SPI_BITORDER(__VALUE__) (((__VALUE__) == LL_SPI_LSB_FIRST) \
+ || ((__VALUE__) == LL_SPI_MSB_FIRST))
+
+#define IS_LL_SPI_CRCCALCULATION(__VALUE__) (((__VALUE__) == LL_SPI_CRCCALCULATION_ENABLE) \
+ || ((__VALUE__) == LL_SPI_CRCCALCULATION_DISABLE))
+
+#define IS_LL_SPI_CRC_POLYNOMIAL(__VALUE__) ((__VALUE__) >= 0x1U)
+
+/**
+ * @}
+ */
+
+/* Private function prototypes -----------------------------------------------*/
+
+/* Exported functions --------------------------------------------------------*/
+/** @addtogroup SPI_LL_Exported_Functions
+ * @{
+ */
+
+/** @addtogroup SPI_LL_EF_Init
+ * @{
+ */
+
+/**
+ * @brief De-initialize the SPI registers to their default reset values.
+ * @param SPIx SPI Instance
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: SPI registers are de-initialized
+ * - ERROR: SPI registers are not de-initialized
+ */
+ErrorStatus LL_SPI_DeInit(SPI_TypeDef *SPIx)
+{
+ ErrorStatus status = ERROR;
+
+ /* Check the parameters */
+ assert_param(IS_SPI_ALL_INSTANCE(SPIx));
+
+#if defined(SPI1)
+ if (SPIx == SPI1)
+ {
+ /* Force reset of SPI clock */
+ LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_SPI1);
+
+ /* Release reset of SPI clock */
+ LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_SPI1);
+
+ status = SUCCESS;
+ }
+#endif /* SPI1 */
+#if defined(SPI2)
+ if (SPIx == SPI2)
+ {
+ /* Force reset of SPI clock */
+ LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI2);
+
+ /* Release reset of SPI clock */
+ LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI2);
+
+ status = SUCCESS;
+ }
+#endif /* SPI2 */
+
+ return status;
+}
+
+/**
+ * @brief Initialize the SPI registers according to the specified parameters in SPI_InitStruct.
+ * @note As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0),
+ * SPI IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
+ * @param SPIx SPI Instance
+ * @param SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure
+ * @retval An ErrorStatus enumeration value. (Return always SUCCESS)
+ */
+ErrorStatus LL_SPI_Init(SPI_TypeDef *SPIx, LL_SPI_InitTypeDef *SPI_InitStruct)
+{
+ ErrorStatus status = ERROR;
+
+ /* Check the SPI Instance SPIx*/
+ assert_param(IS_SPI_ALL_INSTANCE(SPIx));
+
+ /* Check the SPI parameters from SPI_InitStruct*/
+ assert_param(IS_LL_SPI_TRANSFER_DIRECTION(SPI_InitStruct->TransferDirection));
+ assert_param(IS_LL_SPI_MODE(SPI_InitStruct->Mode));
+ assert_param(IS_LL_SPI_DATAWIDTH(SPI_InitStruct->DataWidth));
+ assert_param(IS_LL_SPI_POLARITY(SPI_InitStruct->ClockPolarity));
+ assert_param(IS_LL_SPI_PHASE(SPI_InitStruct->ClockPhase));
+ assert_param(IS_LL_SPI_NSS(SPI_InitStruct->NSS));
+ assert_param(IS_LL_SPI_BAUDRATE(SPI_InitStruct->BaudRate));
+ assert_param(IS_LL_SPI_BITORDER(SPI_InitStruct->BitOrder));
+ assert_param(IS_LL_SPI_CRCCALCULATION(SPI_InitStruct->CRCCalculation));
+
+ if (LL_SPI_IsEnabled(SPIx) == 0x00000000U)
+ {
+ /*---------------------------- SPIx CR1 Configuration ------------------------
+ * Configure SPIx CR1 with parameters:
+ * - TransferDirection: SPI_CR1_BIDIMODE, SPI_CR1_BIDIOE and SPI_CR1_RXONLY bits
+ * - Master/Slave Mode: SPI_CR1_MSTR bit
+ * - ClockPolarity: SPI_CR1_CPOL bit
+ * - ClockPhase: SPI_CR1_CPHA bit
+ * - NSS management: SPI_CR1_SSM bit
+ * - BaudRate prescaler: SPI_CR1_BR[2:0] bits
+ * - BitOrder: SPI_CR1_LSBFIRST bit
+ * - CRCCalculation: SPI_CR1_CRCEN bit
+ */
+ MODIFY_REG(SPIx->CR1,
+ SPI_CR1_CLEAR_MASK,
+ SPI_InitStruct->TransferDirection | SPI_InitStruct->Mode |
+ SPI_InitStruct->ClockPolarity | SPI_InitStruct->ClockPhase |
+ SPI_InitStruct->NSS | SPI_InitStruct->BaudRate |
+ SPI_InitStruct->BitOrder | SPI_InitStruct->CRCCalculation);
+
+ /*---------------------------- SPIx CR2 Configuration ------------------------
+ * Configure SPIx CR2 with parameters:
+ * - DataWidth: DS[3:0] bits
+ * - NSS management: SSOE bit
+ */
+ MODIFY_REG(SPIx->CR2,
+ SPI_CR2_DS | SPI_CR2_SSOE,
+ SPI_InitStruct->DataWidth | (SPI_InitStruct->NSS >> 16U));
+
+ /*---------------------------- SPIx CRCPR Configuration ----------------------
+ * Configure SPIx CRCPR with parameters:
+ * - CRCPoly: CRCPOLY[15:0] bits
+ */
+ if (SPI_InitStruct->CRCCalculation == LL_SPI_CRCCALCULATION_ENABLE)
+ {
+ assert_param(IS_LL_SPI_CRC_POLYNOMIAL(SPI_InitStruct->CRCPoly));
+ LL_SPI_SetCRCPolynomial(SPIx, SPI_InitStruct->CRCPoly);
+ }
+ status = SUCCESS;
+ }
+
+#if defined (SPI_I2S_SUPPORT)
+ /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
+ CLEAR_BIT(SPIx->I2SCFGR, SPI_I2SCFGR_I2SMOD);
+#endif /* SPI_I2S_SUPPORT */
+ return status;
+}
+
+/**
+ * @brief Set each @ref LL_SPI_InitTypeDef field to default value.
+ * @param SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure
+ * whose fields will be set to default values.
+ * @retval None
+ */
+void LL_SPI_StructInit(LL_SPI_InitTypeDef *SPI_InitStruct)
+{
+ /* Set SPI_InitStruct fields to default values */
+ SPI_InitStruct->TransferDirection = LL_SPI_FULL_DUPLEX;
+ SPI_InitStruct->Mode = LL_SPI_MODE_SLAVE;
+ SPI_InitStruct->DataWidth = LL_SPI_DATAWIDTH_8BIT;
+ SPI_InitStruct->ClockPolarity = LL_SPI_POLARITY_LOW;
+ SPI_InitStruct->ClockPhase = LL_SPI_PHASE_1EDGE;
+ SPI_InitStruct->NSS = LL_SPI_NSS_HARD_INPUT;
+ SPI_InitStruct->BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV2;
+ SPI_InitStruct->BitOrder = LL_SPI_MSB_FIRST;
+ SPI_InitStruct->CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;
+ SPI_InitStruct->CRCPoly = 7U;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+#if defined(SPI_I2S_SUPPORT)
+/** @addtogroup I2S_LL
+ * @{
+ */
+
+/* Private types -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private constants ---------------------------------------------------------*/
+/** @defgroup I2S_LL_Private_Constants I2S Private Constants
+ * @{
+ */
+/* I2S registers Masks */
+#define I2S_I2SCFGR_CLEAR_MASK (SPI_I2SCFGR_CHLEN | SPI_I2SCFGR_DATLEN | \
+ SPI_I2SCFGR_CKPOL | SPI_I2SCFGR_I2SSTD | \
+ SPI_I2SCFGR_I2SCFG | SPI_I2SCFGR_I2SMOD )
+
+#define I2S_I2SPR_CLEAR_MASK 0x0002U
+/**
+ * @}
+ */
+/* Private macros ------------------------------------------------------------*/
+/** @defgroup I2S_LL_Private_Macros I2S Private Macros
+ * @{
+ */
+
+#define IS_LL_I2S_DATAFORMAT(__VALUE__) (((__VALUE__) == LL_I2S_DATAFORMAT_16B) \
+ || ((__VALUE__) == LL_I2S_DATAFORMAT_16B_EXTENDED) \
+ || ((__VALUE__) == LL_I2S_DATAFORMAT_24B) \
+ || ((__VALUE__) == LL_I2S_DATAFORMAT_32B))
+
+#define IS_LL_I2S_CPOL(__VALUE__) (((__VALUE__) == LL_I2S_POLARITY_LOW) \
+ || ((__VALUE__) == LL_I2S_POLARITY_HIGH))
+
+#define IS_LL_I2S_STANDARD(__VALUE__) (((__VALUE__) == LL_I2S_STANDARD_PHILIPS) \
+ || ((__VALUE__) == LL_I2S_STANDARD_MSB) \
+ || ((__VALUE__) == LL_I2S_STANDARD_LSB) \
+ || ((__VALUE__) == LL_I2S_STANDARD_PCM_SHORT) \
+ || ((__VALUE__) == LL_I2S_STANDARD_PCM_LONG))
+
+#define IS_LL_I2S_MODE(__VALUE__) (((__VALUE__) == LL_I2S_MODE_SLAVE_TX) \
+ || ((__VALUE__) == LL_I2S_MODE_SLAVE_RX) \
+ || ((__VALUE__) == LL_I2S_MODE_MASTER_TX) \
+ || ((__VALUE__) == LL_I2S_MODE_MASTER_RX))
+
+#define IS_LL_I2S_MCLK_OUTPUT(__VALUE__) (((__VALUE__) == LL_I2S_MCLK_OUTPUT_ENABLE) \
+ || ((__VALUE__) == LL_I2S_MCLK_OUTPUT_DISABLE))
+
+#define IS_LL_I2S_AUDIO_FREQ(__VALUE__) ((((__VALUE__) >= LL_I2S_AUDIOFREQ_8K) \
+ && ((__VALUE__) <= LL_I2S_AUDIOFREQ_192K)) \
+ || ((__VALUE__) == LL_I2S_AUDIOFREQ_DEFAULT))
+
+#define IS_LL_I2S_PRESCALER_LINEAR(__VALUE__) ((__VALUE__) >= 0x2U)
+
+#define IS_LL_I2S_PRESCALER_PARITY(__VALUE__) (((__VALUE__) == LL_I2S_PRESCALER_PARITY_EVEN) \
+ || ((__VALUE__) == LL_I2S_PRESCALER_PARITY_ODD))
+/**
+ * @}
+ */
+
+/* Private function prototypes -----------------------------------------------*/
+
+/* Exported functions --------------------------------------------------------*/
+/** @addtogroup I2S_LL_Exported_Functions
+ * @{
+ */
+
+/** @addtogroup I2S_LL_EF_Init
+ * @{
+ */
+
+/**
+ * @brief De-initialize the SPI/I2S registers to their default reset values.
+ * @param SPIx SPI Instance
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: SPI registers are de-initialized
+ * - ERROR: SPI registers are not de-initialized
+ */
+ErrorStatus LL_I2S_DeInit(SPI_TypeDef *SPIx)
+{
+ return LL_SPI_DeInit(SPIx);
+}
+
+/**
+ * @brief Initializes the SPI/I2S registers according to the specified parameters in I2S_InitStruct.
+ * @note As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0),
+ * SPI IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
+ * @param SPIx SPI Instance
+ * @param I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: SPI registers are Initialized
+ * - ERROR: SPI registers are not Initialized
+ */
+ErrorStatus LL_I2S_Init(SPI_TypeDef *SPIx, LL_I2S_InitTypeDef *I2S_InitStruct)
+{
+ uint16_t i2sdiv = 2U, i2sodd = 0U, packetlength = 1U;
+ uint32_t tmp = 0U;
+ LL_RCC_ClocksTypeDef rcc_clocks;
+ uint32_t sourceclock = 0U;
+ ErrorStatus status = ERROR;
+
+ /* Check the I2S parameters */
+ assert_param(IS_I2S_ALL_INSTANCE(SPIx));
+ assert_param(IS_LL_I2S_MODE(I2S_InitStruct->Mode));
+ assert_param(IS_LL_I2S_STANDARD(I2S_InitStruct->Standard));
+ assert_param(IS_LL_I2S_DATAFORMAT(I2S_InitStruct->DataFormat));
+ assert_param(IS_LL_I2S_MCLK_OUTPUT(I2S_InitStruct->MCLKOutput));
+ assert_param(IS_LL_I2S_AUDIO_FREQ(I2S_InitStruct->AudioFreq));
+ assert_param(IS_LL_I2S_CPOL(I2S_InitStruct->ClockPolarity));
+
+ if (LL_I2S_IsEnabled(SPIx) == 0x00000000U)
+ {
+ /*---------------------------- SPIx I2SCFGR Configuration --------------------
+ * Configure SPIx I2SCFGR with parameters:
+ * - Mode: SPI_I2SCFGR_I2SCFG[1:0] bit
+ * - Standard: SPI_I2SCFGR_I2SSTD[1:0] and SPI_I2SCFGR_PCMSYNC bits
+ * - DataFormat: SPI_I2SCFGR_CHLEN and SPI_I2SCFGR_DATLEN bits
+ * - ClockPolarity: SPI_I2SCFGR_CKPOL bit
+ */
+
+ /* Write to SPIx I2SCFGR */
+ MODIFY_REG(SPIx->I2SCFGR,
+ I2S_I2SCFGR_CLEAR_MASK,
+ I2S_InitStruct->Mode | I2S_InitStruct->Standard |
+ I2S_InitStruct->DataFormat | I2S_InitStruct->ClockPolarity |
+ SPI_I2SCFGR_I2SMOD);
+
+ /*---------------------------- SPIx I2SPR Configuration ----------------------
+ * Configure SPIx I2SPR with parameters:
+ * - MCLKOutput: SPI_I2SPR_MCKOE bit
+ * - AudioFreq: SPI_I2SPR_I2SDIV[7:0] and SPI_I2SPR_ODD bits
+ */
+
+ /* If the requested audio frequency is not the default, compute the prescaler (i2sodd, i2sdiv)
+ * else, default values are used: i2sodd = 0U, i2sdiv = 2U.
+ */
+ if (I2S_InitStruct->AudioFreq != LL_I2S_AUDIOFREQ_DEFAULT)
+ {
+ /* Check the frame length (For the Prescaler computing)
+ * Default value: LL_I2S_DATAFORMAT_16B (packetlength = 1U).
+ */
+ if (I2S_InitStruct->DataFormat != LL_I2S_DATAFORMAT_16B)
+ {
+ /* Packet length is 32 bits */
+ packetlength = 2U;
+ }
+
+ /* I2S Clock source is System clock: Get System Clock frequency */
+ LL_RCC_GetSystemClocksFreq(&rcc_clocks);
+
+ /* Get the source clock value: based on System Clock value */
+ sourceclock = rcc_clocks.SYSCLK_Frequency;
+
+ /* Compute the Real divider depending on the MCLK output state with a floating point */
+ if (I2S_InitStruct->MCLKOutput == LL_I2S_MCLK_OUTPUT_ENABLE)
+ {
+ /* MCLK output is enabled */
+ tmp = (uint16_t)(((((sourceclock / 256U) * 10U) / I2S_InitStruct->AudioFreq)) + 5U);
+ }
+ else
+ {
+ /* MCLK output is disabled */
+ tmp = (uint16_t)(((((sourceclock / (32U * packetlength)) * 10U) / I2S_InitStruct->AudioFreq)) + 5U);
+ }
+
+ /* Remove the floating point */
+ tmp = tmp / 10U;
+
+ /* Check the parity of the divider */
+ i2sodd = (uint16_t)(tmp & (uint16_t)0x0001U);
+
+ /* Compute the i2sdiv prescaler */
+ i2sdiv = (uint16_t)((tmp - i2sodd) / 2U);
+
+ /* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
+ i2sodd = (uint16_t)(i2sodd << 8U);
+ }
+
+ /* Test if the divider is 1 or 0 or greater than 0xFF */
+ if ((i2sdiv < 2U) || (i2sdiv > 0xFFU))
+ {
+ /* Set the default values */
+ i2sdiv = 2U;
+ i2sodd = 0U;
+ }
+
+ /* Write to SPIx I2SPR register the computed value */
+ WRITE_REG(SPIx->I2SPR, i2sdiv | i2sodd | I2S_InitStruct->MCLKOutput);
+
+ status = SUCCESS;
+ }
+ return status;
+}
+
+/**
+ * @brief Set each @ref LL_I2S_InitTypeDef field to default value.
+ * @param I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure
+ * whose fields will be set to default values.
+ * @retval None
+ */
+void LL_I2S_StructInit(LL_I2S_InitTypeDef *I2S_InitStruct)
+{
+ /*--------------- Reset I2S init structure parameters values -----------------*/
+ I2S_InitStruct->Mode = LL_I2S_MODE_SLAVE_TX;
+ I2S_InitStruct->Standard = LL_I2S_STANDARD_PHILIPS;
+ I2S_InitStruct->DataFormat = LL_I2S_DATAFORMAT_16B;
+ I2S_InitStruct->MCLKOutput = LL_I2S_MCLK_OUTPUT_DISABLE;
+ I2S_InitStruct->AudioFreq = LL_I2S_AUDIOFREQ_DEFAULT;
+ I2S_InitStruct->ClockPolarity = LL_I2S_POLARITY_LOW;
+}
+
+/**
+ * @brief Set linear and parity prescaler.
+ * @note To calculate value of PrescalerLinear(I2SDIV[7:0] bits) and PrescalerParity(ODD bit)\n
+ * Check Audio frequency table and formulas inside Reference Manual (SPI/I2S).
+ * @param SPIx SPI Instance
+ * @param PrescalerLinear value: Min_Data=0x02 and Max_Data=0xFF.
+ * @param PrescalerParity This parameter can be one of the following values:
+ * @arg @ref LL_I2S_PRESCALER_PARITY_EVEN
+ * @arg @ref LL_I2S_PRESCALER_PARITY_ODD
+ * @retval None
+ */
+void LL_I2S_ConfigPrescaler(SPI_TypeDef *SPIx, uint32_t PrescalerLinear, uint32_t PrescalerParity)
+{
+ /* Check the I2S parameters */
+ assert_param(IS_I2S_ALL_INSTANCE(SPIx));
+ assert_param(IS_LL_I2S_PRESCALER_LINEAR(PrescalerLinear));
+ assert_param(IS_LL_I2S_PRESCALER_PARITY(PrescalerParity));
+
+ /* Write to SPIx I2SPR */
+ MODIFY_REG(SPIx->I2SPR, SPI_I2SPR_I2SDIV | SPI_I2SPR_ODD, PrescalerLinear | (PrescalerParity << 8U));
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+#endif /* SPI_I2S_SUPPORT */
+
+#endif /* defined (SPI1) || defined (SPI2) */
+
+/**
+ * @}
+ */
+
+#endif /* USE_FULL_LL_DRIVER */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
