/** | |
****************************************************************************** | |
* @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****/ |