/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_spi.c
* Author : MCD Application Team
* Version : V2.0.2
* Date : 07/11/2008
* Description : This file provides all the SPI firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE 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 FIRMWARE 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)
/* I2S I2SE mask */
#define I2SCFGR_I2SE_Set ((u16)0x0400)
#define I2SCFGR_I2SE_Reset ((u16)0xFBFF)
/* 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)
#define I2SCFGR_CLEAR_Mask ((u16)0xF040)
/* SPI or I2S mode selection masks */
#define SPI_Mode_Select ((u16)0xF7FF)
#define I2S_Mode_Select ((u16)0x0800)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : SPI_I2S_DeInit
* Description : Deinitializes the SPIx peripheral registers to their default
* reset values (Affects also the I2Ss).
* Input : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_DeInit(SPI_TypeDef* SPIx)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(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;
case SPI3_BASE:
/* Enable SPI3 reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE);
/* Release SPI3 from reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, DISABLE);
break;
default:
break;
}
}
/*******************************************************************************
* Function Name : SPI_Init
* Description : Initializes the SPIx peripheral according to the specified
* parameters in the SPI_InitStruct.
* Input : - SPIx: where x can be 1, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
/* Check the SPI parameters */
assert_param(IS_SPI_DIRECTION_MODE(SPI_InitStruct->SPI_Direction));
assert_param(IS_SPI_MODE(SPI_InitStruct->SPI_Mode));
assert_param(IS_SPI_DATASIZE(SPI_InitStruct->SPI_DataSize));
assert_param(IS_SPI_CPOL(SPI_InitStruct->SPI_CPOL));
assert_param(IS_SPI_CPHA(SPI_InitStruct->SPI_CPHA));
assert_param(IS_SPI_NSS(SPI_InitStruct->SPI_NSS));
assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_InitStruct->SPI_BaudRatePrescaler));
assert_param(IS_SPI_FIRST_BIT(SPI_InitStruct->SPI_FirstBit));
assert_param(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;
/* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
SPIx->I2SCFGR &= SPI_Mode_Select;
/*---------------------------- SPIx CRCPOLY Configuration --------------------*/
/* Write to SPIx CRCPOLY */
SPIx->CRCPR = SPI_InitStruct->SPI_CRCPolynomial;
}
/*******************************************************************************
* Function Name : I2S_Init
* Description : Initializes the SPIx peripheral according to the specified
* parameters in the I2S_InitStruct.
* Input : - SPIx: where x can be 2 or 3 to select the SPI peripheral
* (configured in I2S mode).
* - I2S_InitStruct: pointer to an I2S_InitTypeDef structure that
* contains the configuration information for the specified
* SPI peripheral configured in I2S mode.
* Output : None
* Return : None
******************************************************************************/
void I2S_Init(SPI_TypeDef* SPIx, I2S_InitTypeDef* I2S_InitStruct)
{
u16 tmpreg = 0, i2sdiv = 2, i2sodd = 0, packetlength = 1;
u32 tmp = 0;
RCC_ClocksTypeDef RCC_Clocks;
/* Check the I2S parameters */
assert_param(IS_SPI_23_PERIPH(SPIx));
assert_param(IS_I2S_MODE(I2S_InitStruct->I2S_Mode));
assert_param(IS_I2S_STANDARD(I2S_InitStruct->I2S_Standard));
assert_param(IS_I2S_DATA_FORMAT(I2S_InitStruct->I2S_DataFormat));
assert_param(IS_I2S_MCLK_OUTPUT(I2S_InitStruct->I2S_MCLKOutput));
assert_param(IS_I2S_AUDIO_FREQ(I2S_InitStruct->I2S_AudioFreq));
assert_param(IS_I2S_CPOL(I2S_InitStruct->I2S_CPOL));
/*----------------------- SPIx I2SCFGR & I2SPR Configuration -----------------*/
/* Clear I2SMOD, I2SE, I2SCFG, PCMSYNC, I2SSTD, CKPOL, DATLEN and CHLEN bits */
SPIx->I2SCFGR &= I2SCFGR_CLEAR_Mask;
SPIx->I2SPR = 0x0002;
/* Get the I2SCFGR register value */
tmpreg = SPIx->I2SCFGR;
/* If the default value has to be written, reinitialize i2sdiv and i2sodd*/
if(I2S_InitStruct->I2S_AudioFreq == I2S_AudioFreq_Default)
{
i2sodd = (u16)0;
i2sdiv = (u16)2;
}
/* If the requested audio frequency is not the default, compute the prescaler */
else
{
/* Check the frame length (For the Prescaler computing) */
if(I2S_InitStruct->I2S_DataFormat == I2S_DataFormat_16b)
{
/* Packet length is 16 bits */
packetlength = 1;
}
else
{
/* Packet length is 32 bits */
packetlength = 2;
}
/* Get System Clock frequency */
RCC_GetClocksFreq(&RCC_Clocks);
/* Compute the Real divider depending on the MCLK output state with a flaoting point */
if(I2S_InitStruct->I2S_MCLKOutput == I2S_MCLKOutput_Enable)
{
/* MCLK output is enabled */
tmp = (u16)(((10 * RCC_Clocks.SYSCLK_Frequency) / (256 * I2S_InitStruct->I2S_AudioFreq)) + 5);
}
else
{
/* MCLK output is disabled */
tmp = (u16)(((10 * RCC_Clocks.SYSCLK_Frequency) / (32 * packetlength * I2S_InitStruct->I2S_AudioFreq)) + 5);
}
/* Remove the flaoting point */
tmp = tmp/10;
/* Check the parity of the divider */
i2sodd = (u16)(tmp & (u16)0x0001);
/* Compute the i2sdiv prescaler */
i2sdiv = (u16)((tmp - i2sodd) / 2);
/* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
i2sodd = (u16) (i2sodd << 8);
}
/* Test if the divider is 1 or 0 */
if ((i2sdiv < 2) || (i2sdiv > 0xFF))
{
/* Set the default values */
i2sdiv = 2;
i2sodd = 0;
}
/* Write to SPIx I2SPR register the computed value */
SPIx->I2SPR = (u16)(i2sdiv | i2sodd | I2S_InitStruct->I2S_MCLKOutput);
/* Configure the I2S with the SPI_InitStruct values */
tmpreg |= (u16)(I2S_Mode_Select | I2S_InitStruct->I2S_Mode | \
I2S_InitStruct->I2S_Standard | I2S_InitStruct->I2S_DataFormat | \
I2S_InitStruct->I2S_CPOL);
/* Write to SPIx I2SCFGR */
SPIx->I2SCFGR = tmpreg;
}
/*******************************************************************************
* 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 : I2S_StructInit
* Description : Fills each I2S_InitStruct member with its default value.
* Input : - I2S_InitStruct : pointer to a I2S_InitTypeDef structure
* which will be initialized.
* Output : None
* Return : None
*******************************************************************************/
void I2S_StructInit(I2S_InitTypeDef* I2S_InitStruct)
{
/*--------------- Reset I2S init structure parameters values -----------------*/
/* Initialize the I2S_Mode member */
I2S_InitStruct->I2S_Mode = I2S_Mode_SlaveTx;
/* Initialize the I2S_Standard member */
I2S_InitStruct->I2S_Standard = I2S_Standard_Phillips;
/* Initialize the I2S_DataFormat member */
I2S_InitStruct->I2S_DataFormat = I2S_DataFormat_16b;
/* Initialize the I2S_MCLKOutput member */
I2S_InitStruct->I2S_MCLKOutput = I2S_MCLKOutput_Disable;
/* Initialize the I2S_AudioFreq member */
I2S_InitStruct->I2S_AudioFreq = I2S_AudioFreq_Default;
/* Initialize the I2S_CPOL member */
I2S_InitStruct->I2S_CPOL = I2S_CPOL_Low;
}
/*******************************************************************************
* Function Name : SPI_Cmd
* Description : Enables or disables the specified SPI peripheral.
* Input : - SPIx: where x can be 1, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(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 : I2S_Cmd
* Description : Enables or disables the specified SPI peripheral (in I2S mode).
* Input : - SPIx: where x can be 2 or 3 to select the SPI peripheral.
* - NewState: new state of the SPIx peripheral.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void I2S_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_SPI_23_PERIPH(SPIx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected SPI peripheral (in I2S mode) */
SPIx->I2SCFGR |= I2SCFGR_I2SE_Set;
}
else
{
/* Disable the selected SPI peripheral (in I2S mode) */
SPIx->I2SCFGR &= I2SCFGR_I2SE_Reset;
}
}
/*******************************************************************************
* Function Name : SPI_I2S_ITConfig
* Description : Enables or disables the specified SPI/I2S interrupts.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* - SPI_I2S_IT: specifies the SPI/I2S interrupt source to be
* enabled or disabled.
* This parameter can be one of the following values:
* - SPI_I2S_IT_TXE: Tx buffer empty interrupt mask
* - SPI_I2S_IT_RXNE: Rx buffer not empty interrupt mask
* - SPI_I2S_IT_ERR: Error interrupt mask
* - NewState: new state of the specified SPI/I2S interrupt.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, u8 SPI_I2S_IT, FunctionalState NewState)
{
u16 itpos = 0, itmask = 0 ;
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
assert_param(IS_SPI_I2S_CONFIG_IT(SPI_I2S_IT));
/* Get the SPI/I2S IT index */
itpos = SPI_I2S_IT >> 4;
/* Set the IT mask */
itmask = (u16)((u16)1 << itpos);
if (NewState != DISABLE)
{
/* Enable the selected SPI/I2S interrupt */
SPIx->CR2 |= itmask;
}
else
{
/* Disable the selected SPI/I2S interrupt */
SPIx->CR2 &= (u16)~itmask;
}
}
/*******************************************************************************
* Function Name : SPI_I2S_DMACmd
* Description : Enables or disables the SPIx/I2Sx DMA interface.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* - SPI_I2S_DMAReq: specifies the SPI/I2S DMA transfer request
* to be enabled or disabled.
* This parameter can be any combination of the following values:
* - SPI_I2S_DMAReq_Tx: Tx buffer DMA transfer request
* - SPI_I2S_DMAReq_Rx: Rx buffer DMA transfer request
* - NewState: new state of the selected SPI/I2S DMA transfer
* request.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, u16 SPI_I2S_DMAReq, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
assert_param(IS_SPI_I2S_DMAREQ(SPI_I2S_DMAReq));
if (NewState != DISABLE)
{
/* Enable the selected SPI/I2S DMA requests */
SPIx->CR2 |= SPI_I2S_DMAReq;
}
else
{
/* Disable the selected SPI/I2S DMA requests */
SPIx->CR2 &= (u16)~SPI_I2S_DMAReq;
}
}
/*******************************************************************************
* Function Name : SPI_I2S_SendData
* Description : Transmits a Data through the SPIx/I2Sx peripheral.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* - Data : Data to be transmitted..
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_SendData(SPI_TypeDef* SPIx, u16 Data)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
/* Write in the DR register the data to be sent */
SPIx->DR = Data;
}
/*******************************************************************************
* Function Name : SPI_I2S_ReceiveData
* Description : Returns the most recent received data by the SPIx/I2Sx peripheral.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* Output : None
* Return : The value of the received data.
*******************************************************************************/
u16 SPI_I2S_ReceiveData(SPI_TypeDef* SPIx)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(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, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(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, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(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, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_DATASIZE(SPI_DataSize));
/* Clear DFF bit */
SPIx->CR1 &= (u16)~SPI_DataSize_16b;
/* Set new DFF bit value */
SPIx->CR1 |= SPI_DataSize;
}
/*******************************************************************************
* Function Name : SPI_TransmitCRC
* Description : Transmit the SPIx CRC value.
* Input : - SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
* Output : None
* Return : None
*******************************************************************************/
void SPI_TransmitCRC(SPI_TypeDef* SPIx)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(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, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(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, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(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, 2 or 3 to select the SPI peripheral.
* Output : None
* Return : The CRC Polynomial register value.
*******************************************************************************/
u16 SPI_GetCRCPolynomial(SPI_TypeDef* SPIx)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(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, 2 or 3 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_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(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_I2S_GetFlagStatus
* Description : Checks whether the specified SPI/I2S flag is set or not.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* - SPI_I2S_FLAG: specifies the SPI/I2S flag to check.
* This parameter can be one of the following values:
* - SPI_I2S_FLAG_TXE: Transmit buffer empty flag.
* - SPI_I2S_FLAG_RXNE: Receive buffer not empty flag.
* - SPI_I2S_FLAG_BSY: Busy flag.
* - SPI_I2S_FLAG_OVR: Overrun flag.
* - SPI_FLAG_MODF: Mode Fault flag.
* - SPI_FLAG_CRCERR: CRC Error flag.
* - I2S_FLAG_UDR: Underrun Error flag.
* - I2S_FLAG_CHSIDE: Channel Side flag.
* Output : None
* Return : The new state of SPI_I2S_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, u16 SPI_I2S_FLAG)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_GET_FLAG(SPI_I2S_FLAG));
/* Check the status of the specified SPI/I2S flag */
if ((SPIx->SR & SPI_I2S_FLAG) != (u16)RESET)
{
/* SPI_I2S_FLAG is set */
bitstatus = SET;
}
else
{
/* SPI_I2S_FLAG is reset */
bitstatus = RESET;
}
/* Return the SPI_I2S_FLAG status */
return bitstatus;
}
/*******************************************************************************
* Function Name : SPI_I2S_ClearFlag
* Description : Clears the SPIx CRC Error (CRCERR) flag.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - SPI_I2S_FLAG: specifies the SPI flag to clear.
* This function clears only CRCERR flag.
* Notes:
* - OVR (OverRun error) flag is cleared by software
* sequence: a read operation to SPI_DR register
* (SPI_I2S_ReceiveData()) followed by a read operation
* to SPI_SR register (SPI_I2S_GetFlagStatus()).
* - UDR (UnderRun error) flag is cleared by a read
* operation to SPI_SR register (SPI_I2S_GetFlagStatus()).
* - MODF (Mode Fault) flag is cleared by software sequence:
* a read/write operation to SPI_SR register
* (SPI_I2S_GetFlagStatus()) followed by a write
* operation to SPI_CR1 register (SPI_Cmd() to enable
* the SPI).
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, u16 SPI_I2S_FLAG)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_CLEAR_FLAG(SPI_I2S_FLAG));
/* Clear the selected SPI CRC Error (CRCERR) flag */
SPIx->SR = (u16)~SPI_I2S_FLAG;
}
/*******************************************************************************
* Function Name : SPI_I2S_GetITStatus
* Description : Checks whether the specified SPI/I2S interrupt has occurred or not.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* - SPI_I2S_IT: specifies the SPI/I2S interrupt source to check.
* This parameter can be one of the following values:
* - SPI_I2S_IT_TXE: Transmit buffer empty interrupt.
* - SPI_I2S_IT_RXNE: Receive buffer not empty interrupt.
* - SPI_I2S_IT_OVR: Overrun interrupt.
* - SPI_IT_MODF: Mode Fault interrupt.
* - SPI_IT_CRCERR: CRC Error interrupt.
* - I2S_IT_UDR: Underrun Error interrupt.
* Output : None
* Return : The new state of SPI_I2S_IT (SET or RESET).
*******************************************************************************/
ITStatus SPI_I2S_GetITStatus(SPI_TypeDef* SPIx, u8 SPI_I2S_IT)
{
ITStatus bitstatus = RESET;
u16 itpos = 0, itmask = 0, enablestatus = 0;
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_GET_IT(SPI_I2S_IT));
/* Get the SPI/I2S IT index */
itpos = (u16)((u16)0x01 << (SPI_I2S_IT & (u8)0x0F));
/* Get the SPI/I2S IT mask */
itmask = SPI_I2S_IT >> 4;
/* Set the IT mask */
itmask = (u16)((u16)0x01 << itmask);
/* Get the SPI_I2S_IT enable bit status */
enablestatus = (SPIx->CR2 & itmask) ;
/* Check the status of the specified SPI/I2S interrupt */
if (((SPIx->SR & itpos) != (u16)RESET) && enablestatus)
{
/* SPI_I2S_IT is set */
bitstatus = SET;
}
else
{
/* SPI_I2S_IT is reset */
bitstatus = RESET;
}
/* Return the SPI_I2S_IT status */
return bitstatus;
}
/*******************************************************************************
* Function Name : SPI_I2S_ClearITPendingBit
* Description : Clears the SPIx CRC Error (CRCERR) interrupt pending bit.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - SPI_I2S_IT: specifies the SPI interrupt pending bit to clear.
* This function clears only CRCERR intetrrupt pending bit.
* Notes:
* - OVR (OverRun Error) interrupt pending bit is cleared
* by software sequence: a read operation to SPI_DR
* register (SPI_I2S_ReceiveData()) followed by a read
* operation to SPI_SR register (SPI_I2S_GetITStatus()).
* - UDR (UnderRun Error) interrupt pending bit is cleared
* by a read operation to SPI_SR register
* (SPI_I2S_GetITStatus()).
* - MODF (Mode Fault) interrupt pending bit is cleared by
* software sequence: a read/write operation to SPI_SR
* register (SPI_I2S_GetITStatus()) followed by a write
* operation to SPI_CR1 register (SPI_Cmd() to enable the
* SPI).
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, u8 SPI_I2S_IT)
{
u16 itpos = 0;
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_CLEAR_IT(SPI_I2S_IT));
/* Get the SPI IT index */
itpos = (u16)((u16)0x01 << (SPI_I2S_IT & (u8)0x0F));
/* Clear the selected SPI CRC Error (CRCERR) interrupt pending bit */
SPIx->SR = (u16)~itpos;
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/