Diff: targets/cmsis/TARGET_STM/TARGET_DISCO_F100RB/stm32f10x_spi.c

Revision:

126:549ba18ddd81

diff -r 23cc3068a9e4 -r 549ba18ddd81 targets/cmsis/TARGET_STM/TARGET_DISCO_F100RB/stm32f10x_spi.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_DISCO_F100RB/stm32f10x_spi.c	Wed Mar 19 16:00:09 2014 +0000
@@ -0,0 +1,923 @@
+/**
+  ******************************************************************************
+  * @file    stm32f10x_spi.c
+  * @author  MCD Application Team
+  * @version V3.6.1
+  * @date    05-March-2012
+  * @brief   This file provides all the SPI firmware functions.
+ *******************************************************************************
+ * Copyright (c) 2014, STMicroelectronics
+ * All rights reserved.
+ *
+ * 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.
+ *******************************************************************************
+ */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f10x_spi.h"
+#include "stm32f10x_rcc.h"
+
+/** @addtogroup STM32F10x_StdPeriph_Driver
+  * @{
+  */
+
+/** @defgroup SPI 
+  * @brief SPI driver modules
+  * @{
+  */ 
+
+/** @defgroup SPI_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */ 
+
+
+/** @defgroup SPI_Private_Defines
+  * @{
+  */
+
+/* SPI SPE mask */
+#define CR1_SPE_Set          ((uint16_t)0x0040)
+#define CR1_SPE_Reset        ((uint16_t)0xFFBF)
+
+/* I2S I2SE mask */
+#define I2SCFGR_I2SE_Set     ((uint16_t)0x0400)
+#define I2SCFGR_I2SE_Reset   ((uint16_t)0xFBFF)
+
+/* SPI CRCNext mask */
+#define CR1_CRCNext_Set      ((uint16_t)0x1000)
+
+/* SPI CRCEN mask */
+#define CR1_CRCEN_Set        ((uint16_t)0x2000)
+#define CR1_CRCEN_Reset      ((uint16_t)0xDFFF)
+
+/* SPI SSOE mask */
+#define CR2_SSOE_Set         ((uint16_t)0x0004)
+#define CR2_SSOE_Reset       ((uint16_t)0xFFFB)
+
+/* SPI registers Masks */
+#define CR1_CLEAR_Mask       ((uint16_t)0x3040)
+#define I2SCFGR_CLEAR_Mask   ((uint16_t)0xF040)
+
+/* SPI or I2S mode selection masks */
+#define SPI_Mode_Select      ((uint16_t)0xF7FF)
+#define I2S_Mode_Select      ((uint16_t)0x0800) 
+
+/* I2S clock source selection masks */
+#define I2S2_CLOCK_SRC       ((uint32_t)(0x00020000))
+#define I2S3_CLOCK_SRC       ((uint32_t)(0x00040000))
+#define I2S_MUL_MASK         ((uint32_t)(0x0000F000))
+#define I2S_DIV_MASK         ((uint32_t)(0x000000F0))
+
+/**
+  * @}
+  */
+
+/** @defgroup SPI_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup SPI_Private_Variables
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup SPI_Private_FunctionPrototypes
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup SPI_Private_Functions
+  * @{
+  */
+
+/**
+  * @brief  Deinitializes the SPIx peripheral registers to their default
+  *         reset values (Affects also the I2Ss).
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @retval None
+  */
+void SPI_I2S_DeInit(SPI_TypeDef* SPIx)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+
+  if (SPIx == SPI1)
+  {
+    /* Enable SPI1 reset state */
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
+    /* Release SPI1 from reset state */
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
+  }
+  else if (SPIx == SPI2)
+  {
+    /* Enable SPI2 reset state */
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
+    /* Release SPI2 from reset state */
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
+  }
+  else
+  {
+    if (SPIx == SPI3)
+    {
+      /* Enable SPI3 reset state */
+      RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE);
+      /* Release SPI3 from reset state */
+      RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, DISABLE);
+    }
+  }
+}
+
+/**
+  * @brief  Initializes the SPIx peripheral according to the specified 
+  *         parameters in the SPI_InitStruct.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  SPI_InitStruct: pointer to a SPI_InitTypeDef structure that
+  *         contains the configuration information for the specified SPI peripheral.
+  * @retval None
+  */
+void SPI_Init(SPI_TypeDef* SPIx, SPI_InitTypeDef* SPI_InitStruct)
+{
+  uint16_t tmpreg = 0;
+  
+  /* check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));   
+  
+  /* Check the SPI parameters */
+  assert_param(IS_SPI_DIRECTION_MODE(SPI_InitStruct->SPI_Direction));
+  assert_param(IS_SPI_MODE(SPI_InitStruct->SPI_Mode));
+  assert_param(IS_SPI_DATASIZE(SPI_InitStruct->SPI_DataSize));
+  assert_param(IS_SPI_CPOL(SPI_InitStruct->SPI_CPOL));
+  assert_param(IS_SPI_CPHA(SPI_InitStruct->SPI_CPHA));
+  assert_param(IS_SPI_NSS(SPI_InitStruct->SPI_NSS));
+  assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_InitStruct->SPI_BaudRatePrescaler));
+  assert_param(IS_SPI_FIRST_BIT(SPI_InitStruct->SPI_FirstBit));
+  assert_param(IS_SPI_CRC_POLYNOMIAL(SPI_InitStruct->SPI_CRCPolynomial));
+
+/*---------------------------- SPIx CR1 Configuration ------------------------*/
+  /* Get the SPIx CR1 value */
+  tmpreg = SPIx->CR1;
+  /* Clear BIDIMode, BIDIOE, RxONLY, SSM, SSI, LSBFirst, BR, MSTR, CPOL and CPHA bits */
+  tmpreg &= CR1_CLEAR_Mask;
+  /* Configure SPIx: direction, NSS management, first transmitted bit, BaudRate prescaler
+     master/salve mode, CPOL and CPHA */
+  /* Set BIDImode, BIDIOE and RxONLY bits according to SPI_Direction value */
+  /* Set SSM, SSI and MSTR bits according to SPI_Mode and SPI_NSS values */
+  /* Set LSBFirst bit according to SPI_FirstBit value */
+  /* Set BR bits according to SPI_BaudRatePrescaler value */
+  /* Set CPOL bit according to SPI_CPOL value */
+  /* Set CPHA bit according to SPI_CPHA value */
+  tmpreg |= (uint16_t)((uint32_t)SPI_InitStruct->SPI_Direction | SPI_InitStruct->SPI_Mode |
+                  SPI_InitStruct->SPI_DataSize | SPI_InitStruct->SPI_CPOL |  
+                  SPI_InitStruct->SPI_CPHA | SPI_InitStruct->SPI_NSS |  
+                  SPI_InitStruct->SPI_BaudRatePrescaler | SPI_InitStruct->SPI_FirstBit);
+  /* Write to SPIx CR1 */
+  SPIx->CR1 = tmpreg;
+  
+  /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
+  SPIx->I2SCFGR &= SPI_Mode_Select;		
+
+/*---------------------------- SPIx CRCPOLY Configuration --------------------*/
+  /* Write to SPIx CRCPOLY */
+  SPIx->CRCPR = SPI_InitStruct->SPI_CRCPolynomial;
+}
+
+/**
+  * @brief  Initializes the SPIx peripheral according to the specified 
+  *         parameters in the I2S_InitStruct.
+  * @param  SPIx: where x can be  2 or 3 to select the SPI peripheral
+  *         (configured in I2S mode).
+  * @param  I2S_InitStruct: pointer to an I2S_InitTypeDef structure that
+  *         contains the configuration information for the specified SPI peripheral
+  *         configured in I2S mode.
+  * @note
+  *  The function calculates the optimal prescaler needed to obtain the most 
+  *  accurate audio frequency (depending on the I2S clock source, the PLL values 
+  *  and the product configuration). But in case the prescaler value is greater 
+  *  than 511, the default value (0x02) will be configured instead.  *   
+  * @retval None
+  */
+void I2S_Init(SPI_TypeDef* SPIx, I2S_InitTypeDef* I2S_InitStruct)
+{
+  uint16_t tmpreg = 0, i2sdiv = 2, i2sodd = 0, packetlength = 1;
+  uint32_t tmp = 0;
+  RCC_ClocksTypeDef RCC_Clocks;
+  uint32_t sourceclock = 0;
+  
+  /* Check the I2S parameters */
+  assert_param(IS_SPI_23_PERIPH(SPIx));
+  assert_param(IS_I2S_MODE(I2S_InitStruct->I2S_Mode));
+  assert_param(IS_I2S_STANDARD(I2S_InitStruct->I2S_Standard));
+  assert_param(IS_I2S_DATA_FORMAT(I2S_InitStruct->I2S_DataFormat));
+  assert_param(IS_I2S_MCLK_OUTPUT(I2S_InitStruct->I2S_MCLKOutput));
+  assert_param(IS_I2S_AUDIO_FREQ(I2S_InitStruct->I2S_AudioFreq));
+  assert_param(IS_I2S_CPOL(I2S_InitStruct->I2S_CPOL));  
+
+/*----------------------- SPIx I2SCFGR & I2SPR Configuration -----------------*/
+  /* Clear I2SMOD, I2SE, I2SCFG, PCMSYNC, I2SSTD, CKPOL, DATLEN and CHLEN bits */
+  SPIx->I2SCFGR &= I2SCFGR_CLEAR_Mask; 
+  SPIx->I2SPR = 0x0002;
+  
+  /* Get the I2SCFGR register value */
+  tmpreg = SPIx->I2SCFGR;
+  
+  /* If the default value has to be written, reinitialize i2sdiv and i2sodd*/
+  if(I2S_InitStruct->I2S_AudioFreq == I2S_AudioFreq_Default)
+  {
+    i2sodd = (uint16_t)0;
+    i2sdiv = (uint16_t)2;   
+  }
+  /* If the requested audio frequency is not the default, compute the prescaler */
+  else
+  {
+    /* Check the frame length (For the Prescaler computing) */
+    if(I2S_InitStruct->I2S_DataFormat == I2S_DataFormat_16b)
+    {
+      /* Packet length is 16 bits */
+      packetlength = 1;
+    }
+    else
+    {
+      /* Packet length is 32 bits */
+      packetlength = 2;
+    }
+
+    /* Get the I2S clock source mask depending on the peripheral number */
+    if(((uint32_t)SPIx) == SPI2_BASE)
+    {
+      /* The mask is relative to I2S2 */
+      tmp = I2S2_CLOCK_SRC;
+    }
+    else 
+    {
+      /* The mask is relative to I2S3 */      
+      tmp = I2S3_CLOCK_SRC;
+    }
+
+    /* Check the I2S clock source configuration depending on the Device:
+       Only Connectivity line devices have the PLL3 VCO clock */
+#ifdef STM32F10X_CL
+    if((RCC->CFGR2 & tmp) != 0)
+    {
+      /* Get the configuration bits of RCC PLL3 multiplier */
+      tmp = (uint32_t)((RCC->CFGR2 & I2S_MUL_MASK) >> 12);
+
+      /* Get the value of the PLL3 multiplier */      
+      if((tmp > 5) && (tmp < 15))
+      {
+        /* Multiplier is between 8 and 14 (value 15 is forbidden) */
+        tmp += 2;
+      }
+      else
+      {
+        if (tmp == 15)
+        {
+          /* Multiplier is 20 */
+          tmp = 20;
+        }
+      }      
+      /* Get the PREDIV2 value */
+      sourceclock = (uint32_t)(((RCC->CFGR2 & I2S_DIV_MASK) >> 4) + 1);
+      
+      /* Calculate the Source Clock frequency based on PLL3 and PREDIV2 values */
+      sourceclock = (uint32_t) ((HSE_Value / sourceclock) * tmp * 2); 
+    }
+    else
+    {
+      /* I2S Clock source is System clock: Get System Clock frequency */
+      RCC_GetClocksFreq(&RCC_Clocks);      
+      
+      /* Get the source clock value: based on System Clock value */
+      sourceclock = RCC_Clocks.SYSCLK_Frequency;
+    }        
+#else /* STM32F10X_HD */
+    /* I2S Clock source is System clock: Get System Clock frequency */
+    RCC_GetClocksFreq(&RCC_Clocks);      
+      
+    /* Get the source clock value: based on System Clock value */
+    sourceclock = RCC_Clocks.SYSCLK_Frequency;    
+#endif /* STM32F10X_CL */    
+
+    /* Compute the Real divider depending on the MCLK output state with a floating point */
+    if(I2S_InitStruct->I2S_MCLKOutput == I2S_MCLKOutput_Enable)
+    {
+      /* MCLK output is enabled */
+      tmp = (uint16_t)(((((sourceclock / 256) * 10) / I2S_InitStruct->I2S_AudioFreq)) + 5);
+    }
+    else
+    {
+      /* MCLK output is disabled */
+      tmp = (uint16_t)(((((sourceclock / (32 * packetlength)) *10 ) / I2S_InitStruct->I2S_AudioFreq)) + 5);
+    }
+    
+    /* Remove the floating point */
+    tmp = tmp / 10;  
+      
+    /* Check the parity of the divider */
+    i2sodd = (uint16_t)(tmp & (uint16_t)0x0001);
+   
+    /* Compute the i2sdiv prescaler */
+    i2sdiv = (uint16_t)((tmp - i2sodd) / 2);
+   
+    /* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
+    i2sodd = (uint16_t) (i2sodd << 8);
+  }
+  
+  /* Test if the divider is 1 or 0 or greater than 0xFF */
+  if ((i2sdiv < 2) || (i2sdiv > 0xFF))
+  {
+    /* Set the default values */
+    i2sdiv = 2;
+    i2sodd = 0;
+  }
+
+  /* Write to SPIx I2SPR register the computed value */
+  SPIx->I2SPR = (uint16_t)(i2sdiv | (uint16_t)(i2sodd | (uint16_t)I2S_InitStruct->I2S_MCLKOutput));  
+ 
+  /* Configure the I2S with the SPI_InitStruct values */
+  tmpreg |= (uint16_t)(I2S_Mode_Select | (uint16_t)(I2S_InitStruct->I2S_Mode | \
+                  (uint16_t)(I2S_InitStruct->I2S_Standard | (uint16_t)(I2S_InitStruct->I2S_DataFormat | \
+                  (uint16_t)I2S_InitStruct->I2S_CPOL))));
+ 
+  /* Write to SPIx I2SCFGR */  
+  SPIx->I2SCFGR = tmpreg;   
+}
+
+/**
+  * @brief  Fills each SPI_InitStruct member with its default value.
+  * @param  SPI_InitStruct : pointer to a SPI_InitTypeDef structure which will be initialized.
+  * @retval None
+  */
+void SPI_StructInit(SPI_InitTypeDef* SPI_InitStruct)
+{
+/*--------------- Reset SPI init structure parameters values -----------------*/
+  /* Initialize the SPI_Direction member */
+  SPI_InitStruct->SPI_Direction = SPI_Direction_2Lines_FullDuplex;
+  /* initialize the SPI_Mode member */
+  SPI_InitStruct->SPI_Mode = SPI_Mode_Slave;
+  /* initialize the SPI_DataSize member */
+  SPI_InitStruct->SPI_DataSize = SPI_DataSize_8b;
+  /* Initialize the SPI_CPOL member */
+  SPI_InitStruct->SPI_CPOL = SPI_CPOL_Low;
+  /* Initialize the SPI_CPHA member */
+  SPI_InitStruct->SPI_CPHA = SPI_CPHA_1Edge;
+  /* Initialize the SPI_NSS member */
+  SPI_InitStruct->SPI_NSS = SPI_NSS_Hard;
+  /* Initialize the SPI_BaudRatePrescaler member */
+  SPI_InitStruct->SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
+  /* Initialize the SPI_FirstBit member */
+  SPI_InitStruct->SPI_FirstBit = SPI_FirstBit_MSB;
+  /* Initialize the SPI_CRCPolynomial member */
+  SPI_InitStruct->SPI_CRCPolynomial = 7;
+}
+
+/**
+  * @brief  Fills each I2S_InitStruct member with its default value.
+  * @param  I2S_InitStruct : pointer to a I2S_InitTypeDef structure which will be initialized.
+  * @retval None
+  */
+void I2S_StructInit(I2S_InitTypeDef* I2S_InitStruct)
+{
+/*--------------- Reset I2S init structure parameters values -----------------*/
+  /* Initialize the I2S_Mode member */
+  I2S_InitStruct->I2S_Mode = I2S_Mode_SlaveTx;
+  
+  /* Initialize the I2S_Standard member */
+  I2S_InitStruct->I2S_Standard = I2S_Standard_Phillips;
+  
+  /* Initialize the I2S_DataFormat member */
+  I2S_InitStruct->I2S_DataFormat = I2S_DataFormat_16b;
+  
+  /* Initialize the I2S_MCLKOutput member */
+  I2S_InitStruct->I2S_MCLKOutput = I2S_MCLKOutput_Disable;
+  
+  /* Initialize the I2S_AudioFreq member */
+  I2S_InitStruct->I2S_AudioFreq = I2S_AudioFreq_Default;
+  
+  /* Initialize the I2S_CPOL member */
+  I2S_InitStruct->I2S_CPOL = I2S_CPOL_Low;
+}
+
+/**
+  * @brief  Enables or disables the specified SPI peripheral.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  NewState: new state of the SPIx peripheral. 
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void SPI_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  if (NewState != DISABLE)
+  {
+    /* Enable the selected SPI peripheral */
+    SPIx->CR1 |= CR1_SPE_Set;
+  }
+  else
+  {
+    /* Disable the selected SPI peripheral */
+    SPIx->CR1 &= CR1_SPE_Reset;
+  }
+}
+
+/**
+  * @brief  Enables or disables the specified SPI peripheral (in I2S mode).
+  * @param  SPIx: where x can be 2 or 3 to select the SPI peripheral.
+  * @param  NewState: new state of the SPIx peripheral. 
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void I2S_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_23_PERIPH(SPIx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  if (NewState != DISABLE)
+  {
+    /* Enable the selected SPI peripheral (in I2S mode) */
+    SPIx->I2SCFGR |= I2SCFGR_I2SE_Set;
+  }
+  else
+  {
+    /* Disable the selected SPI peripheral (in I2S mode) */
+    SPIx->I2SCFGR &= I2SCFGR_I2SE_Reset;
+  }
+}
+
+/**
+  * @brief  Enables or disables the specified SPI/I2S interrupts.
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  *   - 2 or 3 in I2S mode
+  * @param  SPI_I2S_IT: specifies the SPI/I2S interrupt source to be enabled or disabled. 
+  *   This parameter can be one of the following values:
+  *     @arg SPI_I2S_IT_TXE: Tx buffer empty interrupt mask
+  *     @arg SPI_I2S_IT_RXNE: Rx buffer not empty interrupt mask
+  *     @arg SPI_I2S_IT_ERR: Error interrupt mask
+  * @param  NewState: new state of the specified SPI/I2S interrupt.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState)
+{
+  uint16_t itpos = 0, itmask = 0 ;
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  assert_param(IS_SPI_I2S_CONFIG_IT(SPI_I2S_IT));
+
+  /* Get the SPI/I2S IT index */
+  itpos = SPI_I2S_IT >> 4;
+
+  /* Set the IT mask */
+  itmask = (uint16_t)1 << (uint16_t)itpos;
+
+  if (NewState != DISABLE)
+  {
+    /* Enable the selected SPI/I2S interrupt */
+    SPIx->CR2 |= itmask;
+  }
+  else
+  {
+    /* Disable the selected SPI/I2S interrupt */
+    SPIx->CR2 &= (uint16_t)~itmask;
+  }
+}
+
+/**
+  * @brief  Enables or disables the SPIx/I2Sx DMA interface.
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  *   - 2 or 3 in I2S mode
+  * @param  SPI_I2S_DMAReq: specifies the SPI/I2S DMA transfer request to be enabled or disabled. 
+  *   This parameter can be any combination of the following values:
+  *     @arg SPI_I2S_DMAReq_Tx: Tx buffer DMA transfer request
+  *     @arg SPI_I2S_DMAReq_Rx: Rx buffer DMA transfer request
+  * @param  NewState: new state of the selected SPI/I2S DMA transfer request.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState NewState)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  assert_param(IS_SPI_I2S_DMAREQ(SPI_I2S_DMAReq));
+  if (NewState != DISABLE)
+  {
+    /* Enable the selected SPI/I2S DMA requests */
+    SPIx->CR2 |= SPI_I2S_DMAReq;
+  }
+  else
+  {
+    /* Disable the selected SPI/I2S DMA requests */
+    SPIx->CR2 &= (uint16_t)~SPI_I2S_DMAReq;
+  }
+}
+
+/**
+  * @brief  Transmits a Data through the SPIx/I2Sx peripheral.
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  *   - 2 or 3 in I2S mode
+  * @param  Data : Data to be transmitted.
+  * @retval None
+  */
+void SPI_I2S_SendData(SPI_TypeDef* SPIx, uint16_t Data)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  
+  /* Write in the DR register the data to be sent */
+  SPIx->DR = Data;
+}
+
+/**
+  * @brief  Returns the most recent received data by the SPIx/I2Sx peripheral. 
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  *   - 2 or 3 in I2S mode
+  * @retval The value of the received data.
+  */
+uint16_t SPI_I2S_ReceiveData(SPI_TypeDef* SPIx)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  
+  /* Return the data in the DR register */
+  return SPIx->DR;
+}
+
+/**
+  * @brief  Configures internally by software the NSS pin for the selected SPI.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  SPI_NSSInternalSoft: specifies the SPI NSS internal state.
+  *   This parameter can be one of the following values:
+  *     @arg SPI_NSSInternalSoft_Set: Set NSS pin internally
+  *     @arg SPI_NSSInternalSoft_Reset: Reset NSS pin internally
+  * @retval None
+  */
+void SPI_NSSInternalSoftwareConfig(SPI_TypeDef* SPIx, uint16_t SPI_NSSInternalSoft)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_NSS_INTERNAL(SPI_NSSInternalSoft));
+  if (SPI_NSSInternalSoft != SPI_NSSInternalSoft_Reset)
+  {
+    /* Set NSS pin internally by software */
+    SPIx->CR1 |= SPI_NSSInternalSoft_Set;
+  }
+  else
+  {
+    /* Reset NSS pin internally by software */
+    SPIx->CR1 &= SPI_NSSInternalSoft_Reset;
+  }
+}
+
+/**
+  * @brief  Enables or disables the SS output for the selected SPI.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  NewState: new state of the SPIx SS output. 
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void SPI_SSOutputCmd(SPI_TypeDef* SPIx, FunctionalState NewState)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  if (NewState != DISABLE)
+  {
+    /* Enable the selected SPI SS output */
+    SPIx->CR2 |= CR2_SSOE_Set;
+  }
+  else
+  {
+    /* Disable the selected SPI SS output */
+    SPIx->CR2 &= CR2_SSOE_Reset;
+  }
+}
+
+/**
+  * @brief  Configures the data size for the selected SPI.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  SPI_DataSize: specifies the SPI data size.
+  *   This parameter can be one of the following values:
+  *     @arg SPI_DataSize_16b: Set data frame format to 16bit
+  *     @arg SPI_DataSize_8b: Set data frame format to 8bit
+  * @retval None
+  */
+void SPI_DataSizeConfig(SPI_TypeDef* SPIx, uint16_t SPI_DataSize)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_DATASIZE(SPI_DataSize));
+  /* Clear DFF bit */
+  SPIx->CR1 &= (uint16_t)~SPI_DataSize_16b;
+  /* Set new DFF bit value */
+  SPIx->CR1 |= SPI_DataSize;
+}
+
+/**
+  * @brief  Transmit the SPIx CRC value.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @retval None
+  */
+void SPI_TransmitCRC(SPI_TypeDef* SPIx)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  
+  /* Enable the selected SPI CRC transmission */
+  SPIx->CR1 |= CR1_CRCNext_Set;
+}
+
+/**
+  * @brief  Enables or disables the CRC value calculation of the transferred bytes.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  NewState: new state of the SPIx CRC value calculation.
+  *   This parameter can be: ENABLE or DISABLE.
+  * @retval None
+  */
+void SPI_CalculateCRC(SPI_TypeDef* SPIx, FunctionalState NewState)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_FUNCTIONAL_STATE(NewState));
+  if (NewState != DISABLE)
+  {
+    /* Enable the selected SPI CRC calculation */
+    SPIx->CR1 |= CR1_CRCEN_Set;
+  }
+  else
+  {
+    /* Disable the selected SPI CRC calculation */
+    SPIx->CR1 &= CR1_CRCEN_Reset;
+  }
+}
+
+/**
+  * @brief  Returns the transmit or the receive CRC register value for the specified SPI.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  SPI_CRC: specifies the CRC register to be read.
+  *   This parameter can be one of the following values:
+  *     @arg SPI_CRC_Tx: Selects Tx CRC register
+  *     @arg SPI_CRC_Rx: Selects Rx CRC register
+  * @retval The selected CRC register value..
+  */
+uint16_t SPI_GetCRC(SPI_TypeDef* SPIx, uint8_t SPI_CRC)
+{
+  uint16_t crcreg = 0;
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_CRC(SPI_CRC));
+  if (SPI_CRC != SPI_CRC_Rx)
+  {
+    /* Get the Tx CRC register */
+    crcreg = SPIx->TXCRCR;
+  }
+  else
+  {
+    /* Get the Rx CRC register */
+    crcreg = SPIx->RXCRCR;
+  }
+  /* Return the selected CRC register */
+  return crcreg;
+}
+
+/**
+  * @brief  Returns the CRC Polynomial register value for the specified SPI.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @retval The CRC Polynomial register value.
+  */
+uint16_t SPI_GetCRCPolynomial(SPI_TypeDef* SPIx)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  
+  /* Return the CRC polynomial register */
+  return SPIx->CRCPR;
+}
+
+/**
+  * @brief  Selects the data transfer direction in bi-directional mode for the specified SPI.
+  * @param  SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
+  * @param  SPI_Direction: specifies the data transfer direction in bi-directional mode. 
+  *   This parameter can be one of the following values:
+  *     @arg SPI_Direction_Tx: Selects Tx transmission direction
+  *     @arg SPI_Direction_Rx: Selects Rx receive direction
+  * @retval None
+  */
+void SPI_BiDirectionalLineConfig(SPI_TypeDef* SPIx, uint16_t SPI_Direction)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_DIRECTION(SPI_Direction));
+  if (SPI_Direction == SPI_Direction_Tx)
+  {
+    /* Set the Tx only mode */
+    SPIx->CR1 |= SPI_Direction_Tx;
+  }
+  else
+  {
+    /* Set the Rx only mode */
+    SPIx->CR1 &= SPI_Direction_Rx;
+  }
+}
+
+/**
+  * @brief  Checks whether the specified SPI/I2S flag is set or not.
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  *   - 2 or 3 in I2S mode
+  * @param  SPI_I2S_FLAG: specifies the SPI/I2S flag to check. 
+  *   This parameter can be one of the following values:
+  *     @arg SPI_I2S_FLAG_TXE: Transmit buffer empty flag.
+  *     @arg SPI_I2S_FLAG_RXNE: Receive buffer not empty flag.
+  *     @arg SPI_I2S_FLAG_BSY: Busy flag.
+  *     @arg SPI_I2S_FLAG_OVR: Overrun flag.
+  *     @arg SPI_FLAG_MODF: Mode Fault flag.
+  *     @arg SPI_FLAG_CRCERR: CRC Error flag.
+  *     @arg I2S_FLAG_UDR: Underrun Error flag.
+  *     @arg I2S_FLAG_CHSIDE: Channel Side flag.
+  * @retval The new state of SPI_I2S_FLAG (SET or RESET).
+  */
+FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG)
+{
+  FlagStatus bitstatus = RESET;
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_I2S_GET_FLAG(SPI_I2S_FLAG));
+  /* Check the status of the specified SPI/I2S flag */
+  if ((SPIx->SR & SPI_I2S_FLAG) != (uint16_t)RESET)
+  {
+    /* SPI_I2S_FLAG is set */
+    bitstatus = SET;
+  }
+  else
+  {
+    /* SPI_I2S_FLAG is reset */
+    bitstatus = RESET;
+  }
+  /* Return the SPI_I2S_FLAG status */
+  return  bitstatus;
+}
+
+/**
+  * @brief  Clears the SPIx CRC Error (CRCERR) flag.
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  * @param  SPI_I2S_FLAG: specifies the SPI flag to clear. 
+  *   This function clears only CRCERR flag.
+  * @note
+  *   - OVR (OverRun error) flag is cleared by software sequence: a read 
+  *     operation to SPI_DR register (SPI_I2S_ReceiveData()) followed by a read 
+  *     operation to SPI_SR register (SPI_I2S_GetFlagStatus()).
+  *   - UDR (UnderRun error) flag is cleared by a read operation to 
+  *     SPI_SR register (SPI_I2S_GetFlagStatus()).
+  *   - MODF (Mode Fault) flag is cleared by software sequence: a read/write 
+  *     operation to SPI_SR register (SPI_I2S_GetFlagStatus()) followed by a 
+  *     write operation to SPI_CR1 register (SPI_Cmd() to enable the SPI).
+  * @retval None
+  */
+void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG)
+{
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_I2S_CLEAR_FLAG(SPI_I2S_FLAG));
+    
+    /* Clear the selected SPI CRC Error (CRCERR) flag */
+    SPIx->SR = (uint16_t)~SPI_I2S_FLAG;
+}
+
+/**
+  * @brief  Checks whether the specified SPI/I2S interrupt has occurred or not.
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  *   - 2 or 3 in I2S mode
+  * @param  SPI_I2S_IT: specifies the SPI/I2S interrupt source to check. 
+  *   This parameter can be one of the following values:
+  *     @arg SPI_I2S_IT_TXE: Transmit buffer empty interrupt.
+  *     @arg SPI_I2S_IT_RXNE: Receive buffer not empty interrupt.
+  *     @arg SPI_I2S_IT_OVR: Overrun interrupt.
+  *     @arg SPI_IT_MODF: Mode Fault interrupt.
+  *     @arg SPI_IT_CRCERR: CRC Error interrupt.
+  *     @arg I2S_IT_UDR: Underrun Error interrupt.
+  * @retval The new state of SPI_I2S_IT (SET or RESET).
+  */
+ITStatus SPI_I2S_GetITStatus(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT)
+{
+  ITStatus bitstatus = RESET;
+  uint16_t itpos = 0, itmask = 0, enablestatus = 0;
+
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_I2S_GET_IT(SPI_I2S_IT));
+
+  /* Get the SPI/I2S IT index */
+  itpos = 0x01 << (SPI_I2S_IT & 0x0F);
+
+  /* Get the SPI/I2S IT mask */
+  itmask = SPI_I2S_IT >> 4;
+
+  /* Set the IT mask */
+  itmask = 0x01 << itmask;
+
+  /* Get the SPI_I2S_IT enable bit status */
+  enablestatus = (SPIx->CR2 & itmask) ;
+
+  /* Check the status of the specified SPI/I2S interrupt */
+  if (((SPIx->SR & itpos) != (uint16_t)RESET) && enablestatus)
+  {
+    /* SPI_I2S_IT is set */
+    bitstatus = SET;
+  }
+  else
+  {
+    /* SPI_I2S_IT is reset */
+    bitstatus = RESET;
+  }
+  /* Return the SPI_I2S_IT status */
+  return bitstatus;
+}
+
+/**
+  * @brief  Clears the SPIx CRC Error (CRCERR) interrupt pending bit.
+  * @param  SPIx: where x can be
+  *   - 1, 2 or 3 in SPI mode 
+  * @param  SPI_I2S_IT: specifies the SPI interrupt pending bit to clear.
+  *   This function clears only CRCERR interrupt pending bit.   
+  * @note
+  *   - OVR (OverRun Error) interrupt pending bit is cleared by software 
+  *     sequence: a read operation to SPI_DR register (SPI_I2S_ReceiveData()) 
+  *     followed by a read operation to SPI_SR register (SPI_I2S_GetITStatus()).
+  *   - UDR (UnderRun Error) interrupt pending bit is cleared by a read 
+  *     operation to SPI_SR register (SPI_I2S_GetITStatus()).
+  *   - MODF (Mode Fault) interrupt pending bit is cleared by software sequence:
+  *     a read/write operation to SPI_SR register (SPI_I2S_GetITStatus()) 
+  *     followed by a write operation to SPI_CR1 register (SPI_Cmd() to enable 
+  *     the SPI).
+  * @retval None
+  */
+void SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT)
+{
+  uint16_t itpos = 0;
+  /* Check the parameters */
+  assert_param(IS_SPI_ALL_PERIPH(SPIx));
+  assert_param(IS_SPI_I2S_CLEAR_IT(SPI_I2S_IT));
+
+  /* Get the SPI IT index */
+  itpos = 0x01 << (SPI_I2S_IT & 0x0F);
+
+  /* Clear the selected SPI CRC Error (CRCERR) interrupt pending bit */
+  SPIx->SR = (uint16_t)~itpos;
+}
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/