stm32l4xx_hal_spi_ex.c

00001 /**
00002   ******************************************************************************
00003   * @file    stm32l4xx_hal_spi_ex.c
00004   * @author  MCD Application Team
00005   * @version V1.5.1
00006   * @date    31-May-2016
00007   * @brief   Extended SPI HAL module driver.
00008   *          This file provides firmware functions to manage the following
00009   *          SPI peripheral extended functionalities :
00010   *           + IO operation functions
00011   *
00012   ******************************************************************************
00013   * @attention
00014   *
00015   * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
00016   *
00017   * Redistribution and use in source and binary forms, with or without modification,
00018   * are permitted provided that the following conditions are met:
00019   *   1. Redistributions of source code must retain the above copyright notice,
00020   *      this list of conditions and the following disclaimer.
00021   *   2. Redistributions in binary form must reproduce the above copyright notice,
00022   *      this list of conditions and the following disclaimer in the documentation
00023   *      and/or other materials provided with the distribution.
00024   *   3. Neither the name of STMicroelectronics nor the names of its contributors
00025   *      may be used to endorse or promote products derived from this software
00026   *      without specific prior written permission.
00027   *
00028   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00029   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00030   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00031   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00032   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00033   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00034   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00035   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00036   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00037   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00038   *
00039   ******************************************************************************
00040   */
00041 
00042 /* Includes ------------------------------------------------------------------*/
00043 #include "stm32l4xx_hal.h"
00044 
00045 /** @addtogroup STM32L4xx_HAL_Driver
00046   * @{
00047   */
00048 
00049 /** @defgroup SPIEx SPIEx
00050   * @brief SPI Extended HAL module driver
00051   * @{
00052   */
00053 #ifdef HAL_SPI_MODULE_ENABLED
00054 
00055 /* Private typedef -----------------------------------------------------------*/
00056 /* Private defines -----------------------------------------------------------*/
00057 /** @defgroup SPIEx_Private_Constants SPIEx Private Constants
00058   * @{
00059   */
00060 #define SPI_FIFO_SIZE       4
00061 /**
00062   * @}
00063   */
00064 
00065 /* Private macros ------------------------------------------------------------*/
00066 /* Private variables ---------------------------------------------------------*/
00067 /* Private function prototypes -----------------------------------------------*/
00068 /* Exported functions ---------------------------------------------------------*/
00069 
00070 /** @defgroup SPIEx_Exported_Functions SPIEx Exported Functions
00071   * @{
00072   */
00073 
00074 /** @defgroup SPIEx_Exported_Functions_Group1 IO operation functions
00075  *  @brief   Data transfers functions
00076  *
00077 @verbatim
00078   ==============================================================================
00079                       ##### IO operation functions #####
00080  ===============================================================================
00081  [..]
00082     This subsection provides a set of extended functions to manage the SPI
00083     data transfers.
00084 
00085     (#) Rx data flush function:
00086         (++) HAL_SPIEx_FlushRxFifo()
00087 
00088 @endverbatim
00089   * @{
00090   */
00091 
00092 /**
00093   * @brief Flush the RX fifo.
00094   * @param  hspi: pointer to a SPI_HandleTypeDef structure that contains
00095   *               the configuration information for the specified SPI module.
00096   * @retval HAL status
00097   */
00098 HAL_StatusTypeDef HAL_SPIEx_FlushRxFifo(SPI_HandleTypeDef *hspi)
00099 {
00100   __IO uint32_t tmpreg;
00101   uint8_t  count = 0;
00102   while((hspi->Instance->SR & SPI_FLAG_FRLVL) !=  SPI_FRLVL_EMPTY)
00103   {
00104     count++;
00105     tmpreg = hspi->Instance->DR;
00106     UNUSED(tmpreg); /* To avoid GCC warning */
00107     if(count == SPI_FIFO_SIZE)
00108     {
00109       return HAL_TIMEOUT;
00110     }
00111   }
00112   return HAL_OK;
00113 }
00114 
00115 /**
00116   * @}
00117   */
00118 
00119 /**
00120   * @}
00121   */
00122 
00123 #endif /* HAL_SPI_MODULE_ENABLED */
00124 
00125 /**
00126   * @}
00127   */
00128 
00129 /**
00130   * @}
00131   */
00132 
00133 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/