| /** | |
| ****************************************************************************** | |
| * @file stm32l4xx_hal_spi_ex.c | |
| * @author MCD Application Team | |
| * @brief Extended SPI HAL module driver. | |
| * This file provides firmware functions to manage the following | |
| * SPI peripheral extended functionalities : | |
| * + IO operation functions | |
| * | |
| ****************************************************************************** | |
| * @attention | |
| * | |
| * <h2><center>© Copyright (c) 2017 STMicroelectronics. | |
| * All rights reserved.</center></h2> | |
| * | |
| * This software component is licensed by ST under BSD 3-Clause license, | |
| * the "License"; You may not use this file except in compliance with the | |
| * License. You may obtain a copy of the License at: | |
| * opensource.org/licenses/BSD-3-Clause | |
| * | |
| ****************************************************************************** | |
| */ | |
| /* Includes ------------------------------------------------------------------*/ | |
| #include "stm32l4xx_hal.h" | |
| /** @addtogroup STM32L4xx_HAL_Driver | |
| * @{ | |
| */ | |
| /** @defgroup SPIEx SPIEx | |
| * @brief SPI Extended HAL module driver | |
| * @{ | |
| */ | |
| #ifdef HAL_SPI_MODULE_ENABLED | |
| /* Private typedef -----------------------------------------------------------*/ | |
| /* Private defines -----------------------------------------------------------*/ | |
| /** @defgroup SPIEx_Private_Constants SPIEx Private Constants | |
| * @{ | |
| */ | |
| #define SPI_FIFO_SIZE 4UL | |
| /** | |
| * @} | |
| */ | |
| /* Private macros ------------------------------------------------------------*/ | |
| /* Private variables ---------------------------------------------------------*/ | |
| /* Private function prototypes -----------------------------------------------*/ | |
| /* Exported functions --------------------------------------------------------*/ | |
| /** @defgroup SPIEx_Exported_Functions SPIEx Exported Functions | |
| * @{ | |
| */ | |
| /** @defgroup SPIEx_Exported_Functions_Group1 IO operation functions | |
| * @brief Data transfers functions | |
| * | |
| @verbatim | |
| ============================================================================== | |
| ##### IO operation functions ##### | |
| =============================================================================== | |
| [..] | |
| This subsection provides a set of extended functions to manage the SPI | |
| data transfers. | |
| (#) Rx data flush function: | |
| (++) HAL_SPIEx_FlushRxFifo() | |
| @endverbatim | |
| * @{ | |
| */ | |
| /** | |
| * @brief Flush the RX fifo. | |
| * @param hspi pointer to a SPI_HandleTypeDef structure that contains | |
| * the configuration information for the specified SPI module. | |
| * @retval HAL status | |
| */ | |
| HAL_StatusTypeDef HAL_SPIEx_FlushRxFifo(SPI_HandleTypeDef *hspi) | |
| { | |
| __IO uint32_t tmpreg; | |
| uint8_t count = 0U; | |
| while ((hspi->Instance->SR & SPI_FLAG_FRLVL) != SPI_FRLVL_EMPTY) | |
| { | |
| count++; | |
| tmpreg = hspi->Instance->DR; | |
| UNUSED(tmpreg); /* To avoid GCC warning */ | |
| if (count == SPI_FIFO_SIZE) | |
| { | |
| return HAL_TIMEOUT; | |
| } | |
| } | |
| return HAL_OK; | |
| } | |
| /** | |
| * @} | |
| */ | |
| /** | |
| * @} | |
| */ | |
| #endif /* HAL_SPI_MODULE_ENABLED */ | |
| /** | |
| * @} | |
| */ | |
| /** | |
| * @} | |
| */ | |
| /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |