/**
* @brief Initializes the SPIx peripheral according to the specified
* parameters in the SPI_InitStruct.
* @param SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
* @param SPI_InitStruct: pointer to a SPI_InitTypeDef structure that
* contains the configuration information for the specified SPI peripheral.
* @retval None
*/
void SPI_Init(SPI_TypeDef* SPIx, SPI_InitTypeDef* SPI_InitStruct)
{
uint16_t 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 |= (uint16_t)((uint32_t)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;
}
/*******************************************************************************
* 函数名称: SPI_I2S_DMACmd
* 功能描述: 使能或禁止SPIx/I2Sx DMA接口.
* 输入参数: (1)SPIx: x可以是 :
* - 1, 2 或 3 在 SPI 模式
* - 2 或 3 在 I2S 模式
* (2)SPI_I2S_DMAReq: 指定的 SPI/I2S DMA 传输请求被使能或禁止。
* 这个参数可以是下面任意值的组合:
* - SPI_I2S_DMAReq_Tx: 发送缓冲 DMA传输请求
* - SPI_I2S_DMAReq_Rx: 接收缓冲DMA 传输请求
* (3)NewState:选择的 SPI/I2S DMA传输请求新状态
* 这个参数可以是: ENABLE 或DISABLE.
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, u16 SPI_I2S_DMAReq, FunctionalState NewState)
{
/* Check the parameters [检查参数]*/
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 [使能选择的SPI/I2S DMA请求]*/
SPIx->CR2 |= SPI_I2S_DMAReq;
}
else
{
/* Disable the selected SPI/I2S DMA requests [禁止选择的SPI/I2S DMA请求]*/
SPIx->CR2 &= (u16)~SPI_I2S_DMAReq;
}
}
/**
* @brief Enables or disables the SPIx/I2Sx DMA interface.
* @param SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
* the SPI peripheral.
* @param SPI_I2S_DMAReq: specifies the SPI DMA transfer request to be enabled or disabled.
* This parameter can be any combination of the following values:
* @arg SPI_I2S_DMAReq_Tx: Tx buffer DMA transfer request
* @arg SPI_I2S_DMAReq_Rx: Rx buffer DMA transfer request
* @param NewState: new state of the selected SPI DMA transfer request.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, uint16_t 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_DMA_REQ(SPI_I2S_DMAReq));
if (NewState != DISABLE)
{
/* Enable the selected SPI DMA requests */
SPIx->CR2 |= SPI_I2S_DMAReq;
}
else
{
/* Disable the selected SPI DMA requests */
SPIx->CR2 &= (uint16_t)~SPI_I2S_DMAReq;
}
}
/***********************************************************************************************
功能：SPI DMA命令
形参：SPIx SPI 模块号
@arg: SPI0 模块
@arg: SPI1 模块
@arg: SPI2 模块
SPI_IT: 中断标志
@arg SPI_DMAReq_TFFF: 发送队列结束标志
@arg SPI_DMAReq_RFDF: 接收缓冲区满
返回：0
详解：0
************************************************************************************************/
void SPI_DMACmd(SPI_Type* SPIx, uint16_t SPI_DMAReq, FunctionalState NewState)
{
//参数检查
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(SPI_DMAREQ(SPI_DMAReq));
assert_param(IS_FUNCTIONAL_STATE(NewState));
switch(SPI_DMAReq)
{
case SPI_DMAReq_TFFF:
(ENABLE == NewState)?(SPIx->RSER |= SPI_RSER_TFFF_DIRS_MASK):(SPIx->RSER &= ~SPI_RSER_TFFF_DIRS_MASK);
break;
case SPI_DMAReq_RFDF:
(ENABLE == NewState)?(SPIx->RSER |= SPI_RSER_RFDF_DIRS_MASK):(SPIx->RSER &= ~SPI_RSER_RFDF_DIRS_MASK);
break;
default:break;
}
}
/**
* @brief Returns the transmit or the receive CRC register value for the specified SPI.
* @param SPIx: where x can be 1 or 2 to select the SPI peripheral.
* @param SPI_CRC: specifies the CRC register to be read.
* This parameter can be one of the following values:
* @arg SPI_CRC_Tx: Selects Tx CRC register
* @arg SPI_CRC_Rx: Selects Rx CRC register
* @retval The selected CRC register value..
*/
uint16_t SPI_GetCRC(SPI_TypeDef* SPIx, uint8_t SPI_CRC)
{
uint16_t 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;
}
/**
* @brief Deinitializes the SPIx peripheral registers to their default
* reset values.
* @param SPIx: where x can be 1 or 2 to select the SPI peripheral.
* @retval None
*/
void SPI_I2S_DeInit(SPI_TypeDef* SPIx)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
if (SPIx == SPI1) {
/* Enable SPI1 reset state */
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
/* Release SPI1 from reset state */
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
} else {
if (SPIx == SPI2) {
/* Enable SPI2 reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
/* Release SPI2 from reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
}
}
}
/**
* @brief Checks whether the specified SPI flag is set or not.
* @param SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
* the SPI peripheral.
* @param SPI_I2S_FLAG: specifies the SPI flag to check.
* This parameter can be one of the following values:
* @arg SPI_I2S_FLAG_TXE: Transmit buffer empty flag.
* @arg SPI_I2S_FLAG_RXNE: Receive buffer not empty flag.
* @arg SPI_I2S_FLAG_BSY: Busy flag.
* @arg SPI_I2S_FLAG_OVR: Overrun flag.
* @arg SPI_I2S_FLAG_MODF: Mode Fault flag.
* @arg SPI_I2S_FLAG_CRCERR: CRC Error flag.
* @arg SPI_I2S_FLAG_FRE: TI frame format error flag.
* @arg I2S_FLAG_UDR: Underrun Error flag.
* @arg I2S_FLAG_CHSIDE: Channel Side flag.
* @retval The new state of SPI_I2S_FLAG (SET or RESET).
*/
FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, uint16_t 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 flag */
if ((SPIx->SR & SPI_I2S_FLAG) != (uint16_t)RESET) {
/* SPI_I2S_FLAG is set */
bitstatus = SET;
} else {
/* SPI_I2S_FLAG is reset */
bitstatus = RESET;
}
/* Return the SPI_I2S_FLAG status */
return bitstatus;
}
/*******************************************************************************
* 函数名称: SPI_I2S_GetFlagStatus
* 功能描述: 检查指定的SPI/I2S标记是否被置位.
* 输入参数: (1)- SPIx: x可以是 :
* - 1, 2 或 3 在 SPI 模式
* - 2 或 3 在 I2S 模式
* (2)检查指定的SPI/I2S标记是否被设置.
* 这个参数可以是下面的值之一:
* - SPI_I2S_FLAG_TXE: 传输缓冲为空标记.
* - SPI_I2S_FLAG_RXNE: 接收缓冲不空标记.
* - SPI_I2S_FLAG_BSY: 忙碌标记.
* - SPI_I2S_FLAG_OVR: 溢出标记.
* - SPI_FLAG_MODF: 模式错误标记.
* - SPI_FLAG_CRCERR: CRC校验错误标记.
* - I2S_FLAG_UDR: 空栈读出错标记.
* - I2S_FLAG_CHSIDE: 通道边标志.
* 输出参数: 无
* 返回参数: SPI_I2S_FLAG标记的新状态 (SET or RESET).
*******************************************************************************/
FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, u16 SPI_I2S_FLAG)
{
FlagStatus bitstatus = RESET;
/* Check the parameters [检查参数]*/
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 [检查指定的SPI/I2S标志状态]*/
if ((SPIx->SR & SPI_I2S_FLAG) != (u16)RESET)
{
/* SPI_I2S_FLAG is set [置位SPI_I2S_FLAG]*/
bitstatus = SET;
}
else
{
/* SPI_I2S_FLAG is reset [复位SPI_I2S_FLAG]*/
bitstatus = RESET;
}
/* Return the SPI_I2S_FLAG status [返回SPI_I2S_FLAG状态]*/
return bitstatus;
}
/*******************************************************************************
* 函数名称: SPI_GetCRC
* 功能描述: 返回特定SPI外设传送或接收的CRC寄存器的值.
* 输入参数: (1)SPIx ：x为1，2或3用于选定SPI外设。
* (2)SPI_CRC:将被读取的CRC寄存器。
* 这个参数可以是下面的值之一:
* - SPI_CRC_Tx: 选择Tx CRC寄存器
* - SPI_CRC_Rx: 选择Rx CRC寄存器
* 输出参数: 无
* 返回参数: 所选择的CRC寄存器的值。
*******************************************************************************/
u16 SPI_GetCRC(SPI_TypeDef* SPIx, u8 SPI_CRC)
{
u16 crcreg = 0;
/* Check the parameters [检查参数]*/
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 [取得Tx CRC寄存器]*/
crcreg = SPIx->TXCRCR;
}
else
{
/* Get the Rx CRC register [取得Rx CRC寄存器]*/
crcreg = SPIx->RXCRCR;
}
/* Return the selected CRC register [返回选择的CRC寄存器]*/
return crcreg;
}
/**
* @brief Enables or disables the specified SPI/I2S interrupts.
* @param SPIx: where x can be :
* 1, 2 or 3 in SPI mode
* 2 or 3 in I2S mode
* @param SPI_I2S_IT: specifies the SPI/I2S interrupt source to be
* enabled or disabled.
* This parameter can be one of the following values:
* @arg SPI_I2S_IT_TXE: Tx buffer empty interrupt mask
* @arg SPI_I2S_IT_RXNE: Rx buffer not empty interrupt mask
* @arg SPI_I2S_IT_ERR: Error interrupt mask
* @param NewState: new state of the specified SPI/I2S interrupt.
* This parameter can be: ENABLE or DISABLE.
* @retval : None
*/
void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState)
{
uint16_t 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 = (uint16_t)((uint16_t)1 << itpos);
if (NewState != DISABLE)
{
/* Enable the selected SPI/I2S interrupt */
SPIx->CR2 |= itmask;
}
else
{
/* Disable the selected SPI/I2S interrupt */
SPIx->CR2 &= (uint16_t)~itmask;
}
}
/**
* @brief Initializes the SPIx peripheral according to the specified
* parameters in the I2S_InitStruct.
* @param SPIx: where x can be 1, 2 or 3 to select the SPI peripheral.
* @param I2S_InitStruct: pointer to an I2S_InitTypeDef structure that
* contains the configuration information for the specified SPI peripheral
* configured in I2S mode.
* @note This function calculates the optimal prescaler needed to obtain the most
* accurate audio frequency (depending on the I2S clock source, the PLL values
* and the product configuration). But in case the prescaler value is greater
* than 511, the default value (0x02) will be configured instead.
* @retval None
*/
void I2S_Init(SPI_TypeDef* SPIx, I2S_InitTypeDef* I2S_InitStruct)
{
uint16_t tmpreg = 0, i2sdiv = 2, i2sodd = 0, packetlength = 1;
uint32_t tmp = 0;
RCC_ClocksTypeDef RCC_Clocks;
uint32_t sourceclock = 0;
/* Check the I2S parameters */
assert_param(IS_SPI_ALL_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 = (uint16_t)0;
i2sdiv = (uint16_t)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;
}
/* I2S Clock source is System clock: Get System Clock frequency */
RCC_GetClocksFreq(&RCC_Clocks);
/* Get the source clock value: based on System Clock value */
sourceclock = RCC_Clocks.SYSCLK_Frequency;
/* Compute the Real divider depending on the MCLK output state with a floating point */
if(I2S_InitStruct->I2S_MCLKOutput == I2S_MCLKOutput_Enable)
{
/* MCLK output is enabled */
tmp = (uint16_t)(((((sourceclock / 256) * 10) / I2S_InitStruct->I2S_AudioFreq)) + 5);
}
else
{
/* MCLK output is disabled */
tmp = (uint16_t)(((((sourceclock / (32 * packetlength)) *10 ) / I2S_InitStruct->I2S_AudioFreq)) + 5);
}
/* Remove the floating point */
tmp = tmp / 10;
/* Check the parity of the divider */
i2sodd = (uint16_t)(tmp & (uint16_t)0x0001);
/* Compute the i2sdiv prescaler */
i2sdiv = (uint16_t)((tmp - i2sodd) / 2);
/* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
i2sodd = (uint16_t) (i2sodd << 8);
}
/* Test if the divider is 1 or 0 or greater than 0xFF */
if ((i2sdiv < 2) || (i2sdiv > 0xFF))
{
/* Set the default values */
i2sdiv = 2;
i2sodd = 0;
}
/* Write to SPIx I2SPR register the computed value */
SPIx->I2SPR = (uint16_t)(i2sdiv | (uint16_t)(i2sodd | (uint16_t)I2S_InitStruct->I2S_MCLKOutput));
/* Configure the I2S with the SPI_InitStruct values */
tmpreg |= (uint16_t)(SPI_I2SCFGR_I2SMOD | (uint16_t)(I2S_InitStruct->I2S_Mode | \
(uint16_t)(I2S_InitStruct->I2S_Standard | (uint16_t)(I2S_InitStruct->I2S_DataFormat | \
(uint16_t)I2S_InitStruct->I2S_CPOL))));
/* Write to SPIx I2SCFGR */
SPIx->I2SCFGR = tmpreg;
}
