贴个代码：
HAL_StatusTypeDef HAL_SPI_Receive(SPI_HandleTypeDef *hspi, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
#if (USE_SPI_CRC != 0U)
__IO uint32_t tmpreg = 0U;
__IO uint8_t *ptmpreg8;
__IO uint8_t tmpreg8 = 0;
#endif /* USE_SPI_CRC */
uint32_t tickstart;
HAL_StatusTypeDef errorcode = HAL_OK;
if (hspi->State != HAL_SPI_STATE_READY)
{
errorcode = HAL_BUSY;
goto error;
}
if ((hspi->Init.Mode == SPI_MODE_MASTER) && (hspi->Init.Direction == SPI_DIRECTION_2LINES))
{
hspi->State = HAL_SPI_STATE_BUSY_RX;
/* Call transmit-receive function to send Dummy data on Tx line and generate clock on CLK line */
return HAL_SPI_TransmitReceive(hspi, pData, pData, Size, Timeout);
}
/* Process Locked */
__HAL_LOCK(hspi);
/* Init tickstart for timeout management*/
tickstart = HAL_GetTick();
if ((pData == NULL) || (Size == 0U))
{
errorcode = HAL_ERROR;
goto error;
}
/* Set the transaction information */
hspi->State = HAL_SPI_STATE_BUSY_RX;
hspi->ErrorCode = HAL_SPI_ERROR_NONE;
hspi->pRxBuffPtr = (uint8_t *)pData;
hspi->RxXferSize = Size;
hspi->RxXferCount = Size;
/*Init field not used in handle to zero */
hspi->pTxBuffPtr = (uint8_t *)NULL;
hspi->TxXferSize = 0U;
hspi->TxXferCount = 0U;
hspi->RxISR = NULL;
hspi->TxISR = NULL;
#if (USE_SPI_CRC != 0U)
/* Reset CRC Calculation */
if (hspi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLE)
{
SPI_RESET_CRC(hspi);
/* this is done to handle the CRCNEXT before the latest data */
hspi->RxXferCount--;
}
#endif /* USE_SPI_CRC */
/* Set the Rx Fifo threshold */
if (hspi->Init.DataSize > SPI_DATASIZE_8BIT)
{
/* Set RX Fifo threshold according the reception data length: 16bit */
CLEAR_BIT(hspi->Instance->CR2, SPI_RXFIFO_THRESHOLD);
}
else
{
/* Set RX Fifo threshold according the reception data length: 8bit */
SET_BIT(hspi->Instance->CR2, SPI_RXFIFO_THRESHOLD);
}
/* Configure communication direction: 1Line */
if (hspi->Init.Direction == SPI_DIRECTION_1LINE)
{
/* Disable SPI Peripheral before set 1Line direction (BIDIOE bit) */
__HAL_SPI_DISABLE(hspi);
SPI_1LINE_RX(hspi);
}
/* Check if the SPI is already enabled */
if ((hspi->Instance->CR1 & SPI_CR1_SPE) != SPI_CR1_SPE)
{
/* Enable SPI peripheral */
__HAL_SPI_ENABLE(hspi);
}
/* Receive data in 8 Bit mode */
if (hspi->Init.DataSize <= SPI_DATASIZE_8BIT)
{
/* Transfer loop */
while (hspi->RxXferCount > 0U)
{
/* Check the RXNE flag */
if (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXNE))
{
/* read the received data */
(* (uint8_t *)hspi->pRxBuffPtr) = *(__IO uint8_t *)&hspi->Instance->DR;
hspi->pRxBuffPtr += sizeof(uint8_t);
hspi->RxXferCount--;
}
else
{
/* Timeout management */
if ((((HAL_GetTick() - tickstart) >= Timeout) && (Timeout != HAL_MAX_DELAY)) || (Timeout == 0U))
{
errorcode = HAL_TIMEOUT;
hspi->State = HAL_SPI_STATE_READY;
goto error;
}
}
}
}
else
{
/* Transfer loop */
while (hspi->RxXferCount > 0U)
{
/* Check the RXNE flag */
if (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXNE))
{
*((uint16_t *)hspi->pRxBuffPtr) = (uint16_t)hspi->Instance->DR;
hspi->pRxBuffPtr += sizeof(uint16_t);
hspi->RxXferCount--;
}
else
{
/* Timeout management */
if ((((HAL_GetTick() - tickstart) >= Timeout) && (Timeout != HAL_MAX_DELAY)) || (Timeout == 0U))
{
errorcode = HAL_TIMEOUT;
hspi->State = HAL_SPI_STATE_READY;
goto error;
}
}
}
}
#if (USE_SPI_CRC != 0U)
/* Handle the CRC Transmission */
if (hspi->Init.CRCCalculation == SPI_CRCCALCULATION_ENABLE)
{
/* freeze the CRC before the latest data */
SET_BIT(hspi->Instance->CR1, SPI_CR1_CRCNEXT);
/* Read the latest data */
if (SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, SET, Timeout, tickstart) != HAL_OK)
{
/* the latest data has not been received */
errorcode = HAL_TIMEOUT;
goto error;
}
/* Receive last data in 16 Bit mode */
if (hspi->Init.DataSize > SPI_DATASIZE_8BIT)
{
*((uint16_t *)hspi->pRxBuffPtr) = (uint16_t)hspi->Instance->DR;
}
/* Receive last data in 8 Bit mode */
else
{
(*(uint8_t *)hspi->pRxBuffPtr) = *(__IO uint8_t *)&hspi->Instance->DR;
}
/* Wait the CRC data */
if (SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, SET, Timeout, tickstart) != HAL_OK)
{
SET_BIT(hspi->ErrorCode, HAL_SPI_ERROR_CRC);
errorcode = HAL_TIMEOUT;
goto error;
}
/* Read CRC to Flush DR and RXNE flag */
if (hspi->Init.DataSize == SPI_DATASIZE_16BIT)
{
/* Read 16bit CRC */
tmpreg = READ_REG(hspi->Instance->DR);
/* To avoid GCC warning */
UNUSED(tmpreg);
}
else
{
/* Initialize the 8bit temporary pointer */
ptmpreg8 = (__IO uint8_t *)&hspi->Instance->DR;
/* Read 8bit CRC */
tmpreg8 = *ptmpreg8;
/* To avoid GCC warning */
UNUSED(tmpreg8);
if ((hspi->Init.DataSize == SPI_DATASIZE_8BIT) && (hspi->Init.CRCLength == SPI_CRC_LENGTH_16BIT))
{
if (SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, SET, Timeout, tickstart) != HAL_OK)
{
/* Error on the CRC reception */
SET_BIT(hspi->ErrorCode, HAL_SPI_ERROR_CRC);
errorcode = HAL_TIMEOUT;
goto error;
}
/* Read 8bit CRC again in case of 16bit CRC in 8bit Data mode */
tmpreg8 = *ptmpreg8;
/* To avoid GCC warning */
UNUSED(tmpreg8);
}
}
}
#endif /* USE_SPI_CRC */
/* Check the end of the transaction */
if (SPI_EndRxTransaction(hspi, Timeout, tickstart) != HAL_OK)
{
hspi->ErrorCode = HAL_SPI_ERROR_FLAG;
}
#if (USE_SPI_CRC != 0U)
/* Check if CRC error occurred */
if (__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_CRCERR))
{
SET_BIT(hspi->ErrorCode, HAL_SPI_ERROR_CRC);
__HAL_SPI_CLEAR_CRCERRFLAG(hspi);
}
#endif /* USE_SPI_CRC */
if (hspi->ErrorCode != HAL_SPI_ERROR_NONE)
{
errorcode = HAL_ERROR;
}
else
{
hspi->State = HAL_SPI_STATE_READY;
}
error :
__HAL_UNLOCK(hspi);
return errorcode;
}
| 
提升卡
变色卡
千斤顶
1/10 
京公网安备 11010802033920号
Copyright © 2005-2025 EEWORLD.com.cn, Inc. All rights reserved
