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/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************

* File Name          : 91x_ssp.c

* Author             : MCD Application Team

* Version            : V2.1

* Date               : 12/22/2008

* Description        : This file provides all the SSP firmware functions.

********************************************************************************

* 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 "91x_ssp.h"

#include "91x_scu.h"

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* SSP peripheral Enable */

#define SSP_Enable   0x0002

#define SSP_Disable  0xFFFD

/* SSP Loop Back Mode Enable */

#define SSP_LoopBackMode_Enable   0x0001

#define SSP_LoopBackMode_Disable  0xFFFE

/* SSP Flag Mask */

#define SSP_Flag_Mask  0x001F

/* SSP DMA transmit/ receive enable/disable Masks */

#define SSP_DMA_TransmitEnable   0x0002

#define SSP_DMA_TransmitDisable  0xFFFD

#define SSP_DMA_ReceiveEnable    0x0001

#define SSP_DMA_ReceiveDisable   0xFFFE

/* SSP Masks */

#define SSP_FrameFormat_Mask     0xFFCF

#define SSP_DataSize_Mask        0xFFF0

#define SSP_ClockRate_Mask       0x00FF

#define SSP_ClockPrescaler_Mask  0xFF00

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************

* Function Name  : SSP_DeInit

* Description    : Deinitializes the SSPx peripheral registers to their default

*                  reset values.

* Input          : SSPx: where x can be 0 or 1 to select the SSP peripheral.

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_DeInit(SSP_TypeDef* SSPx)

{

  if(SSPx == SSP0)

  {

    /* Reset the SSP0 registers values*/

    SCU_APBPeriphReset(__SSP0,ENABLE);

    SCU_APBPeriphReset(__SSP0,DISABLE);

  }

  else if (SSPx == SSP1)

  {

    /* Reset the SSP1 registers values*/

    SCU_APBPeriphReset(__SSP1,ENABLE);

    SCU_APBPeriphReset(__SSP1,DISABLE);

  }

}

/*******************************************************************************

* Function Name  : SSP_Init

* Description    : Initializes the SSPx  peripheral according to the specified

*                  parameters in the SSP_InitTypeDef structure.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - SSP_InitStruct: pointer to a SSP_InitTypeDef structure that

*                    contains the configuration information for the specified SSP

*                    peripheral.

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_Init(SSP_TypeDef* SSPx, SSP_InitTypeDef* SSP_InitStruct)

{

  if(SSP_InitStruct->SSP_FrameFormat == SSP_FrameFormat_Motorola)

  {

    /* Set the Motorola frame format */

    SSPx->CR0 &= SSP_FrameFormat_Motorola;

    /* Configure the Clock polarity */

    if(SSP_InitStruct->SSP_CPOL == SSP_CPOL_High)

    {

      /* SCK is held high when no data is being transfered */

      SSPx->CR0 |= SSP_CPOL_High;

    }

    else

    {

      /* SCK is held low when no data is being transfered */

      SSPx->CR0 &= SSP_CPOL_Low;

    }

    /* Configure the Clock Phase */

    if(SSP_InitStruct->SSP_CPHA == SSP_CPHA_2Edge)

    {

      /* Data captured on second clock edge */

      SSPx->CR0 |= SSP_CPHA_2Edge;

    }

    else

    {

      /* Data captured on first clock edge */

      SSPx->CR0 &= SSP_CPHA_1Edge;

    }

  }

   /* Configure the Frame format */

  else

  {

    /* Clear the FRF[1:0] bits */

    SSPx->CR0 &= SSP_FrameFormat_Mask;

    /* Set the TI frame format */

    SSPx->CR0 |= SSP_InitStruct->SSP_FrameFormat;

  }

  /* Configure the Mode */

  if(SSP_InitStruct->SSP_Mode == SSP_Mode_Slave)

  {

    /* Set the slave mode */

    SSPx->CR1 |= SSP_Mode_Slave;

    /* Configure the Slave output */

    if(SSP_InitStruct->SSP_SlaveOutput == SSP_SlaveOutput_Disable)

    {

      /* Slave output disabled */

      SSPx->CR1 |= SSP_SlaveOutput_Disable;

    }

    else

    {

      /* Slave output enabled */

      SSPx->CR1 &= SSP_SlaveOutput_Enable;

    }

  }

  else

  {

    /* Set the master mode */

    SSPx->CR1 &= SSP_Mode_Master;

    /* Clear clock rate SCR[7:0] bits */

    SSPx->CR0 &= SSP_ClockRate_Mask;

    /* Set the serial clock rate */

    SSPx->CR0 |= (SSP_InitStruct->SSP_ClockRate<<8);

    /* Clear clock prescaler CPSDVSR[7:0] bits */

    SSPx->PR &= SSP_ClockPrescaler_Mask;

    /* Set the serial clock prescaler */

    SSPx->PR |= SSP_InitStruct->SSP_ClockPrescaler;

  }

  /* Clear data size DSS[3:0] bits */

  SSPx->CR0 &= SSP_DataSize_Mask;

  /* Set the data size */

  SSPx->CR0 |= SSP_InitStruct->SSP_DataSize;

}

/*******************************************************************************

* Function Name  : SSP_StructInit

* Description    : Fills in a SSP_InitTypeDef structure with the reset value of

*                  each parameter.

* Input          : SSP_InitStruct : pointer to a SSP_InitTypeDef structure

                   which will be initialized.

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_StructInit(SSP_InitTypeDef* SSP_InitStruct)

{

  /* Initialize the SSP_FrameFormat member */

  SSP_InitStruct->SSP_FrameFormat = SSP_FrameFormat_Motorola;

  /* Initialize the SSP_Mode member */

  SSP_InitStruct->SSP_Mode = SSP_Mode_Master;

  /* Initialize the SSP_CPOL member */

  SSP_InitStruct->SSP_CPOL = SSP_CPOL_Low;

  /* Initialize the SSP_CPHA member */

  SSP_InitStruct->SSP_CPHA = SSP_CPHA_1Edge;

  /* Initialize the SSP_DataSize member */

  SSP_InitStruct->SSP_DataSize = SSP_DataSize_8b;

  /* Initialize the SSP_SlaveOutput member */

  SSP_InitStruct->SSP_SlaveOutput = SSP_SlaveOutput_Enable;

  /* Initialize the SSP_ClockRate member */

  SSP_InitStruct->SSP_ClockRate = 0;

  /* Initialize the SSP_ClockPrescaler member */

  SSP_InitStruct->SSP_ClockPrescaler = 0;

}

/*******************************************************************************

* Function Name  : SSP_Cmd

* Description    : Enables or disables the specified SSP peripheral.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - NewState: new state of the  SSPx peripheral. This parameter

*                    can be: ENABLE or DISABLE.

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_Cmd(SSP_TypeDef* SSPx, FunctionalState NewState)

{

  if(NewState == ENABLE)

  {

    /* Enable the SSP peripheral */

    SSPx->CR1 |= SSP_Enable;

  }

  else

  {

    /* Disable the SSP peripheral */

    SSPx->CR1 &= SSP_Disable;

  }

}

/*******************************************************************************

* Function Name  : SSP_ITConfig

* Description    : Enables or disables the specified SSP interrupts.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - SSP_IT: specifies the SSP interrupts sources to be enabled

*                    or disabled. This parameter can be any combination of the

*                    following values:

*                         - SSP_IT_TxFifo: Transmit FIFO half empty or less interrupt

*                         - SSP_IT_RxFifo: Receive FIFO half full or less interrupt

*                         - SSP_IT_RxTimeOut: Receive timeout interrupt

*                         - SSP_IT_RxOverrun: Receive overrun interrupt

*                  - NewState: new state of the specified SSP interrupts.

*                    This parameter can be: ENABLE or DISABLE.

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_ITConfig(SSP_TypeDef* SSPx, u16 SSP_IT, FunctionalState NewState)

{

  if(NewState == ENABLE)

  {

    /* Enable the selected SSP interrupts */

    SSPx->IMSCR |= SSP_IT;

  }

  else

  {

    /* Disable the selected SSP interrupts */

    SSPx->IMSCR &= ~SSP_IT;

  }

}

/*******************************************************************************

* Function Name  : SSP_DMACmd

* Description    : Configures the SSP0 DMA interface.

* Input          :  - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                   - SSP_DMATransfert : specifies the DMA transfert to be

*                    enabled or disabled. This parameter can be one of the

*                    following values:

*                         - SSP_DMA_Transmit: transmit Fifo DMA transfert

*                         - SSP_DMA_Receive : receive Fifo DMA transfert

*                  - NewState: new state of the DMA transfert.

*                    This parameter can be: ENABLE or DISABLE.

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_DMACmd(SSP_TypeDef* SSPx, u16 SSP_DMATransfert, FunctionalState NewState)

{

  if(NewState == ENABLE)

  {

    if(SSP_DMATransfert == SSP_DMA_Transmit)

    {

      /* Enable DMA for the transmit FIFO */

      SSPx->DMACR |= SSP_DMA_TransmitEnable;

    }

    else

    {

      /* Enable DMA for the receive FIFO */

      SSPx->DMACR |= SSP_DMA_ReceiveEnable;

    }

  }

  else

  {

    if(SSP_DMATransfert == SSP_DMA_Transmit)

    {

      /* Disable DMA for the transmit FIFO */

      SSPx->DMACR &= SSP_DMA_TransmitDisable;

    }

    else

    {

      /* Disable DMA for the receive FIFO */

      SSPx->DMACR &= SSP_DMA_ReceiveDisable;

    }

  }

}

/*******************************************************************************

* Function Name  : SSP_SendData.

* Description    : Transmits a Data through the SSP peripheral.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - Data : Data to be transmitted.

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_SendData(SSP_TypeDef* SSPx, u16 Data)

{

  /* Write in the DR register the data to be sent */

  SSPx->DR = Data;

}

/*******************************************************************************

* Function Name  : SSP_ReceiveData.

* Description    : Returns the most recent received data by the SSP peripheral.

* Input          : SSPx: where x can be 0 or 1 to select the SSP peripheral.

* Output         : None

* Return         : The value of the received data.

*******************************************************************************/

u16 SSP_ReceiveData(SSP_TypeDef* SSPx)

{

  /* Return the data in the DR register */     

  return SSPx->DR;

}

/*******************************************************************************

* Function Name  : SSP_LoopBackConfig

* Description    : Enable or disable the Loop back mode for the selected SSPx peripheral.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - NewState: new state of the Loop Back mode.

*                    This parameter can be: ENABLE or DISABLE.

* Output         : None

* Return         : None.

*******************************************************************************/

void SSP_LoopBackConfig(SSP_TypeDef* SSPx, FunctionalState NewState)

{

  if(NewState == ENABLE)

  {

    /* Enable loop back mode */

    SSPx->CR1 |= SSP_LoopBackMode_Enable;

  }

  else

  {

    /* Disable loop back mode */

    SSPx->CR1 &= SSP_LoopBackMode_Disable;

  }

}

/*******************************************************************************

* Function Name  : SSP_GetFlagStatus

* Description    : Checks whether the specified SSP flag is set or not.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - SSP_FLAG: flag to check. This parameter can be one of the

*                    following values:

*                         - SSP_FLAG_Busy: busy flag

*                         - SSP_FLAG_RxFifoFull: Receive FIFO full flag

*                         - SSP_FLAG_RxFifoNotEmpty: Receive FIFO not empty flag

*                         - SSP_FLAG_TxFifoNotFull: Transmit FIFO not full flag

*                         - SSP_FLAG_TxFifoEmpty: Transmit FIFO empty flag

*                         - SSP_FLAG_TxFifo: Transmit FIFO half empty or less flag

*                         - SSP_FLAG_RxFifo: Receive FIFO half full or less flag

*                         - SSP_FLAG_RxTimeOut: Receive timeout flag

*                         - SSP_FLAG_RxOverrun: Receive overrun flag

* Output         : None

* Return         : The new state of SSP_Flag (SET or RESET).

*******************************************************************************/

FlagStatus SSP_GetFlagStatus(SSP_TypeDef* SSPx, u16 SSP_FLAG)

{

    u32 SSPReg = 0, FlagPos = 0;

    u32 StatusReg = 0;

  /* Get the SSP register index */

  SSPReg = SSP_FLAG >> 5;

  /* Get the flag position */

  FlagPos = SSP_FLAG & SSP_Flag_Mask;

  /* Find the register of the flag to check */

  if(SSPReg == 1)

  {

    /* The flag to check is in SR register */

    StatusReg = SSPx->SR;      

  }

  else if (SSPReg == 2)

  {

    /* The flag to check is in RISR register */

    StatusReg = SSPx->RISR;

  }

  /* Check the status of the specified SSP flag */

  if((StatusReg & (1 << FlagPos)) != RESET)

  {

    /* Return SET if the SSP flag is set */

    return SET;

  }

  else

  {

    /* Return RESET if the SSP flag is reset */

    return RESET;

  }

}

/*******************************************************************************

* Function Name  : SSP_ClearFlag

* Description    : Clears the SSPx flags.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - SSP_FLAG: flags to clear. This parameter one of the

*                    following values:

*                         - SSP_FLAG_RxTimeOut: Receive timeout flag

*                         - SSP_FLAG_RxOverrun: Receive overrun flag

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_ClearFlag(SSP_TypeDef* SSPx, u16 SSP_FLAG)

{

    u8 FlagPos = 0;

  /* Get the flag position */

  FlagPos = SSP_FLAG & SSP_Flag_Mask;

  /* Clear the selected SSP flag */

  SSPx->ICR = (1 << FlagPos);

}

/*******************************************************************************

* Function Name  : SSP_GetITStatus

* Description    : Checks whether the specified SSP interrupt flag is set or not.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - SSP_IT: interrupt flag to check. This parameter can be one

*                    of the following values:

*                         - SSP_IT_TxFifo: Transmit FIFO half empty or less interrupt

*                         - SSP_IT_RxFifo: Receive FIFO half full or less interrupt

*                         - SSP_IT_RxTimeOut: Receive timeout interrupt

*                         - SSP_IT_RxOverrun: Receive overrun interrupt

* Output         : None

* Return         : The new state of SSP_IT flag (SET or RESET).

*******************************************************************************/

ITStatus SSP_GetITStatus(SSP_TypeDef* SSPx, u16 SSP_IT)

{

  /* Check the status of the specified interrupt flag */

  if((SSPx->MISR & SSP_IT) != RESET)

  {

    /* Return SET if the SSP interrupt flag is set */

    return SET;

  }

  else

  {

    /* Return RESET if SSP interrupt flag is reset */

    return RESET;

  }

}

/*******************************************************************************

* Function Name  : SSP_ClearITPendingBit

* Description    : Clears the pending interrupt flags.

* Input          : - SSPx: where x can be 0 or 1 to select the SSP peripheral.

*                  - SSP_IT: interrupts pending bits to clear. This parameter

*                    can be any combination of the following values:

*                         - SSP_IT_RxTimeOut: Receive timeout interrupt

*                         - SSP_IT_RxOverrun: Receive overrun interrupt

* Output         : None

* Return         : None

*******************************************************************************/

void SSP_ClearITPendingBit(SSP_TypeDef* SSPx, u16 SSP_IT)

{

  /* Clear the selected SSP interrupts pending bits */

  SSPx->ICR = SSP_IT;

}

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/