/******************** (C) COPYRIGHT 2007 STMicroelectronics ******************** | |
* File Name : stm32f10x_spi.c | |
* Author : MCD Application Team | |
* Date First Issued : 09/29/2006 | |
* Description : This file provides all the SPI firmware functions. | |
******************************************************************************** | |
* History: | |
* 04/02/2007: V0.2 | |
* 02/05/2007: V0.1 | |
* 09/29/2006: V0.01 | |
******************************************************************************** | |
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS | |
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. | |
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, | |
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE | |
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING | |
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. | |
*******************************************************************************/ | |
/* Includes ------------------------------------------------------------------*/ | |
#include "stm32f10x_spi.h" | |
#include "stm32f10x_rcc.h" | |
/* Private typedef -----------------------------------------------------------*/ | |
/* Private define ------------------------------------------------------------*/ | |
/* SPI SPE mask */ | |
#define CR1_SPE_Set ((u16)0x0040) | |
#define CR1_SPE_Reset ((u16)0xFFBF) | |
/* SPI CRCNext mask */ | |
#define CR1_CRCNext_Set ((u16)0x1000) | |
/* SPI CRCEN mask */ | |
#define CR1_CRCEN_Set ((u16)0x2000) | |
#define CR1_CRCEN_Reset ((u16)0xDFFF) | |
/* SPI SSOE mask */ | |
#define CR2_SSOE_Set ((u16)0x0004) | |
#define CR2_SSOE_Reset ((u16)0xFFFB) | |
/* SPI registers Masks */ | |
#define CR1_CLEAR_Mask ((u16)0x3040) | |
/* Private macro -------------------------------------------------------------*/ | |
/* Private variables ---------------------------------------------------------*/ | |
/* Private function prototypes -----------------------------------------------*/ | |
/* Private functions ---------------------------------------------------------*/ | |
/******************************************************************************* | |
* Function Name : SPI_DeInit | |
* Description : Deinitializes the SPIx peripheral registers to their default | |
* reset values. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_DeInit(SPI_TypeDef* SPIx) | |
{ | |
switch (*(u32*)&SPIx) | |
{ | |
case SPI1_BASE: | |
/* Enable SPI1 reset state */ | |
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE); | |
/* Release SPI1 from reset state */ | |
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE); | |
break; | |
case SPI2_BASE: | |
/* Enable SPI2 reset state */ | |
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE); | |
/* Release SPI2 from reset state */ | |
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE); | |
break; | |
default: | |
break; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_Init | |
* Description : Initializes the SPIx according to the specified parameters | |
* in the SPI_InitStruct. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_InitStruct: pointer to a SPI_InitTypeDef structure that | |
* contains the configuration information for the specified | |
* SPI peripheral. | |
* Output : None | |
* Return : None | |
******************************************************************************/ | |
void SPI_Init(SPI_TypeDef* SPIx, SPI_InitTypeDef* SPI_InitStruct) | |
{ | |
u16 tmpreg = 0; | |
/* Check the parameters */ | |
assert(IS_SPI_DIRECTION_MODE(SPI_InitStruct->SPI_Direction)); | |
assert(IS_SPI_MODE(SPI_InitStruct->SPI_Mode)); | |
assert(IS_SPI_DATASIZE(SPI_InitStruct->SPI_DataSize)); | |
assert(IS_SPI_CPOL(SPI_InitStruct->SPI_CPOL)); | |
assert(IS_SPI_CPHA(SPI_InitStruct->SPI_CPHA)); | |
assert(IS_SPI_NSS(SPI_InitStruct->SPI_NSS)); | |
assert(IS_SPI_BAUDRATE_PRESCALER(SPI_InitStruct->SPI_BaudRatePrescaler)); | |
assert(IS_SPI_FIRST_BIT(SPI_InitStruct->SPI_FirstBit)); | |
assert(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 |= (u16)((u32)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; | |
/*---------------------------- SPIx CRCPOLY Configuration --------------------*/ | |
/* Write to SPIx CRCPOLY */ | |
SPIx->CRCPR = SPI_InitStruct->SPI_CRCPolynomial; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_StructInit | |
* Description : Fills each SPI_InitStruct member with its default value. | |
* Input : - SPI_InitStruct : pointer to a SPI_InitTypeDef structure | |
* which will be initialized. | |
* Output : None | |
* Return : 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; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_Cmd | |
* Description : Enables or disables the specified SPI peripheral. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - NewState: new state of the SPIx peripheral. | |
* This parameter can be: ENABLE or DISABLE. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState) | |
{ | |
/* Check the parameters */ | |
assert(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; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_ITConfig | |
* Description : Enables or disables the specified SPI interrupts. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_IT: specifies the SPI interrupts sources to be enabled | |
* or disabled. | |
* This parameter can be one of the following values: | |
* - SPI_IT_TXE: Tx buffer empty interrupt mask | |
* - SPI_IT_RXNE: Rx buffer not empty interrupt mask | |
* - SPI_IT_ERR: Error interrupt mask | |
* - NewState: new state of the specified SPI interrupts. | |
* This parameter can be: ENABLE or DISABLE. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_ITConfig(SPI_TypeDef* SPIx, u8 SPI_IT, FunctionalState NewState) | |
{ | |
u16 itpos = 0, itmask = 0 ; | |
/* Check the parameters */ | |
assert(IS_FUNCTIONAL_STATE(NewState)); | |
assert(IS_SPI_CONFIG_IT(SPI_IT)); | |
/* Get the SPI IT index */ | |
itpos = SPI_IT >> 4; | |
/* Set the IT mask */ | |
itmask = (u16)((u16)1 << itpos); | |
if (NewState != DISABLE) | |
{ | |
/* Enable the selected SPI interrupt */ | |
SPIx->CR2 |= itmask; | |
} | |
else | |
{ | |
/* Disable the selected SPI interrupt */ | |
SPIx->CR2 &= (u16)~itmask; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_DMACmd | |
* Description : Enables or disables the SPIxs DMA interface. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_DMAReq: specifies the SPI DMA transfer request to be | |
* enabled or disabled. | |
* This parameter can be any combination of the following values: | |
* - SPI_DMAReq_Tx: Tx buffer DMA transfer request | |
* - SPI_DMAReq_Rx: Rx buffer DMA transfer request | |
* - NewState: new state of the selected SPI DMA transfer request. | |
* This parameter can be: ENABLE or DISABLE. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_DMACmd(SPI_TypeDef* SPIx, u16 SPI_DMAReq, FunctionalState NewState) | |
{ | |
/* Check the parameters */ | |
assert(IS_FUNCTIONAL_STATE(NewState)); | |
assert(IS_SPI_DMA_REQ(SPI_DMAReq)); | |
if (NewState != DISABLE) | |
{ | |
/* Enable the selected SPI DMA requests */ | |
SPIx->CR2 |= SPI_DMAReq; | |
} | |
else | |
{ | |
/* Disable the selected SPI DMA requests */ | |
SPIx->CR2 &= (u16)~SPI_DMAReq; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_SendData | |
* Description : Transmits a Data through the SPIx peripheral. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - Data : Data to be transmitted.. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_SendData(SPI_TypeDef* SPIx, u16 Data) | |
{ | |
/* Write in the DR register the data to be sent */ | |
SPIx->DR = Data; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_ReceiveData | |
* Description : Returns the most recent received data by the SPIx peripheral. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* Output : None | |
* Return : The value of the received data. | |
*******************************************************************************/ | |
u16 SPI_ReceiveData(SPI_TypeDef* SPIx) | |
{ | |
/* Return the data in the DR register */ | |
return SPIx->DR; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_NSSInternalSoftwareConfig | |
* Description : Configures internally by software the NSS pin for the selected | |
* SPI. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_NSSInternalSoft: specifies the SPI NSS internal state. | |
* This parameter can be one of the following values: | |
* - SPI_NSSInternalSoft_Set: Set NSS pin internally | |
* - SPI_NSSInternalSoft_Reset: Reset NSS pin internally | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_NSSInternalSoftwareConfig(SPI_TypeDef* SPIx, u16 SPI_NSSInternalSoft) | |
{ | |
/* Check the parameters */ | |
assert(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; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_SSOutputCmd | |
* Description : Enables or disables the SS output for the selected SPI. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - NewState: new state of the SPIx SS output. | |
* This parameter can be: ENABLE or DISABLE. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_SSOutputCmd(SPI_TypeDef* SPIx, FunctionalState NewState) | |
{ | |
/* Check the parameters */ | |
assert(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; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_DataSizeConfig | |
* Description : Configures the data size for the selected SPI. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_DataSize: specifies the SPI data size. | |
* This parameter can be one of the following values: | |
* - SPI_DataSize_16b: Set data frame format to 16bit | |
* - SPI_DataSize_8b: Set data frame format to 8bit | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_DataSizeConfig(SPI_TypeDef* SPIx, u16 SPI_DataSize) | |
{ | |
/* Check the parameters */ | |
assert(IS_SPI_DATASIZE(SPI_DataSize)); | |
if (SPI_DataSize != SPI_DataSize_8b) | |
{ | |
/* Set data frame format to 16bit */ | |
SPIx->CR1 |= SPI_DataSize_16b; | |
} | |
else | |
{ | |
/* Set data frame format to 8bit */ | |
SPIx->CR1 &= SPI_DataSize_8b; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_TransmitCRC | |
* Description : Transmit the SPIx CRC value. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_TransmitCRC(SPI_TypeDef* SPIx) | |
{ | |
/* Enable the selected SPI CRC transmission */ | |
SPIx->CR1 |= CR1_CRCNext_Set; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_CalculateCRC | |
* Description : Enables or disables the CRC value calculation of the | |
* transfered bytes. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - NewState: new state of the SPIx CRC value calculation. | |
* This parameter can be: ENABLE or DISABLE. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_CalculateCRC(SPI_TypeDef* SPIx, FunctionalState NewState) | |
{ | |
/* Check the parameters */ | |
assert(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; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_GetCRC | |
* Description : Returns the transmit or the receive CRC register value for | |
* the specified SPI. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_CRC: specifies the CRC register to be read. | |
* This parameter can be one of the following values: | |
* - SPI_CRC_Tx: Selects Tx CRC register | |
* - SPI_CRC_Rx: Selects Rx CRC register | |
* Output : None | |
* Return : The selected CRC register value.. | |
*******************************************************************************/ | |
u16 SPI_GetCRC(SPI_TypeDef* SPIx, u8 SPI_CRC) | |
{ | |
u16 crcreg = 0; | |
/* Check the parameters */ | |
assert(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; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_GetCRCPolynomial | |
* Description : Returns the CRC Polynomial register value for the specified SPI. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* Output : None | |
* Return : The CRC Polynomial register value. | |
*******************************************************************************/ | |
u16 SPI_GetCRCPolynomial(SPI_TypeDef* SPIx) | |
{ | |
/* Return the CRC polynomial register */ | |
return SPIx->CRCPR; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_BiDirectionalLineConfig | |
* Description : Selects the data transfer direction in bi-directional mode | |
* for the specified SPI. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_Direction: specifies the data transfer direction in | |
* bi-directional mode. | |
* This parameter can be one of the following values: | |
* - SPI_Direction_Tx: Selects Tx transmission direction | |
* - SPI_Direction_Rx: Selects Rx receive direction | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_BiDirectionalLineConfig(SPI_TypeDef* SPIx, u16 SPI_Direction) | |
{ | |
/* Check the parameters */ | |
assert(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; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_GetFlagStatus | |
* Description : Checks whether the specified SPI flag is set or not. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_FLAG: specifies the flag to check. | |
* This parameter can be one of the following values: | |
* - SPI_FLAG_BSY: Busy flag. | |
* - SPI_FLAG_OVR: Overrun flag. | |
* - SPI_FLAG_MODF: Mode Fault flag. | |
* - SPI_FLAG_CRCERR: CRC Error flag. | |
* - SPI_FLAG_TXE: Transmit buffer empty flag. | |
* - SPI_FLAG_RXNE: Receive buffer not empty flag. | |
* Output : None | |
* Return : The new state of SPI_FLAG (SET or RESET). | |
*******************************************************************************/ | |
FlagStatus SPI_GetFlagStatus(SPI_TypeDef* SPIx, u16 SPI_FLAG) | |
{ | |
FlagStatus bitstatus = RESET; | |
/* Check the parameters */ | |
assert(IS_SPI_GET_FLAG(SPI_FLAG)); | |
/* Check the status of the specified SPI flag */ | |
if ((SPIx->SR & SPI_FLAG) != (u16)RESET) | |
{ | |
/* SPI_FLAG is set */ | |
bitstatus = SET; | |
} | |
else | |
{ | |
/* SPI_FLAG is reset */ | |
bitstatus = RESET; | |
} | |
/* Return the SPI_FLAG status */ | |
return bitstatus; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_ClearFlag | |
* Description : Clears the SPIx's pending flags. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_FLAG: specifies the flag to clear. | |
* This parameter can be any combination of the following values: | |
* - SPI_FLAG_OVR: Overrun flag. | |
* - SPI_FLAG_MODF: Mode Fault flag. | |
* - SPI_FLAG_CRCERR: CRC Error flag. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_ClearFlag(SPI_TypeDef* SPIx, u16 SPI_FLAG) | |
{ | |
/* Check the parameters */ | |
assert(IS_SPI_CLEAR_FLAG(SPI_FLAG)); | |
/* SPI_FLAG_MODF flag clear */ | |
if(SPI_FLAG == SPI_FLAG_MODF) | |
{ | |
/* Read SR register */ | |
(void)SPIx->SR; | |
/* Write on CR1 register */ | |
SPIx->CR1 |= CR1_SPE_Set; | |
} | |
/* SPI_FLAG_OVR flag clear */ | |
else if(SPI_FLAG == SPI_FLAG_OVR) | |
{ | |
/* Read SR register */ | |
(void)SPIx->SR; | |
} | |
else /* SPI_FLAG_CRCERR flag clear */ | |
{ | |
/* Clear the selected SPI flag */ | |
SPIx->SR &= (u16)~SPI_FLAG; | |
} | |
} | |
/******************************************************************************* | |
* Function Name : SPI_GetITStatus | |
* Description : Checks whether the specified SPI interrupt has occurred or not. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_IT: specifies the SPI interrupt source to check. | |
* This parameter can be one of the following values: | |
* - SPI_IT_OVR: Overrun interrupt. | |
* - SPI_IT_MODF: Mode Fault interrupt. | |
* - SPI_IT_CRCERR: CRC Error interrupt. | |
* - SPI_IT_TXE: Transmit buffer empty interrupt. | |
* - SPI_IT_RXNE: Receive buffer not empty interrupt. | |
* Output : None | |
* Return : The new state of SPI_IT (SET or RESET). | |
*******************************************************************************/ | |
ITStatus SPI_GetITStatus(SPI_TypeDef* SPIx, u8 SPI_IT) | |
{ | |
ITStatus bitstatus = RESET; | |
u16 itpos = 0, itmask = 0, enablestatus = 0; | |
/* Check the parameters */ | |
assert(IS_SPI_GET_IT(SPI_IT)); | |
/* Get the SPI IT index */ | |
itpos = (u16)((u16)0x01 << (SPI_IT & (u8)0x0F)); | |
/* Get the SPI IT index */ | |
itmask = SPI_IT >> 4; | |
/* Set the IT mask */ | |
itmask = (u16)((u16)0x01 << itmask); | |
/* Get the SPI_IT enable bit status */ | |
enablestatus = (SPIx->CR2 & itmask) ; | |
/* Check the status of the specified SPI interrupt */ | |
if (((SPIx->SR & itpos) != (u16)RESET) && enablestatus) | |
{ | |
/* SPI_IT is set */ | |
bitstatus = SET; | |
} | |
else | |
{ | |
/* SPI_IT is reset */ | |
bitstatus = RESET; | |
} | |
/* Return the SPI_IT status */ | |
return bitstatus; | |
} | |
/******************************************************************************* | |
* Function Name : SPI_ClearITPendingBit | |
* Description : Clears the SPIs interrupt pending bits. | |
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral. | |
* - SPI_IT: specifies the SPI interrupt pending bit to clear. | |
* This parameter can be one of the following values: | |
* - SPI_IT_OVR: Overrun interrupt. | |
* - SPI_IT_MODF: Mode Fault interrupt. | |
* - SPI_IT_CRCERR: CRC Error interrupt. | |
* Output : None | |
* Return : None | |
*******************************************************************************/ | |
void SPI_ClearITPendingBit(SPI_TypeDef* SPIx, u8 SPI_IT) | |
{ | |
u16 itpos = 0; | |
/* Check the parameters */ | |
assert(IS_SPI_CLEAR_IT(SPI_IT)); | |
/* SPI_IT_MODF pending bit clear */ | |
if(SPI_IT == SPI_IT_MODF) | |
{ | |
/* Read SR register */ | |
(void)SPIx->SR; | |
/* Write on CR1 register */ | |
SPIx->CR1 |= CR1_SPE_Set; | |
} | |
else if(SPI_IT == SPI_IT_OVR) /* SPI_IT_OVR pending bit clear */ | |
{ | |
/* Read SR register */ | |
(void)(SPIx->SR); | |
} | |
else /* SPI_IT_CRCERR pending bit clear */ | |
{ | |
/* Get the SPI IT index */ | |
itpos = (u16)((u16)0x01 << (SPI_IT & (u8)0x0F)); | |
/* Clear the selected SPI interrupt pending bits */ | |
SPIx->SR &= (u16)~itpos; | |
} | |
} | |
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/ |