www.pudn.com > Micrium-ST-uCOS-II-LCD-STM32-SK.rar > stm32f10x_spi.c
/******************** (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:
* 05/21/2007: V0.3
* 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 peripheral 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 interrupt source 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 interrupt.
* 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 SPIx’s 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));
/* 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 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 SPIx’s 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****/