75x_smi.c

嵌入式实验源码。包括：电源管理、复位、时钟管理

* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_SendWENCmd(void)
{
  SMI->CR2 |= SMI_WEN_Mask;
}

/*******************************************************************************
* Function Name  : SMI_SendRSRCmd
* Description    : Sends a Read Status Register Command to the selected memory
*                  Bank.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_SendRSRCmd(void)
{
  SMI->CR2 |= SMI_RSR_Mask;
}

/*******************************************************************************
* Function Name  : SMI_SendCmd
* Description    : Sends command to the selected memory Bank. This function is
*                  used in Software mode only.
* Input          : - Command: specifies the command to send to the external memory.
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_SendCmd(u32 Command)
{
  /* Load the command in the Transmit Register */
  SMI->TR = Command;

  /* Start transfer */    
  SMI->CR2 |= SMI_SEND_Mask;
}

/*******************************************************************************
* Function Name  : SMI_FastReadConfig
* Description    : Enables or disables the Fast Read Mode.
* Input          : - SMI_FastRead: specifies whether the Fast Read Mode is
*                    enabled or disabled.
*                    This parameter can be one of the following values:
*                          - SMI_FastRead_Disable : Fast Read Mode disabled
*                          - SMI_FastRead_Enable : Fast Read Mode enabled
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_FastReadConfig(u32 SMI_FastRead)
{
  if(SMI_FastRead == SMI_FastRead_Enable)
  {
    SMI->CR1 |= SMI_FastRead_Enable;
  }
  else
  {
    SMI->CR1 &= SMI_FastRead_Disable;
  }
}

/*******************************************************************************
* Function Name  : SMI_WriteBurstConfig
* Description    : Enables or disables the Write Burst Mode.
* Input          : - SMI_WriteBurst: specifies whether the Write Burst Mode is
*                    enabled or disabled.
*                    This parameter can be one of the following values:
*                          - SMI_WriteBurst_Disable : Write Burst Mode disabled
*                          - SMI_WriteBurst_Enable : Write Burst Mode enabled
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_WriteBurstConfig(u32 SMI_WriteBurst)
{
  if(SMI_WriteBurst == SMI_WriteBurst_Enable)
  {
    SMI->CR1 |= SMI_WriteBurst_Enable;
  }
  else
  {
    SMI->CR1 &= SMI_WriteBurst_Disable;
  }
}

/*******************************************************************************
* Function Name  : SMI_WriteByte
* Description    : Writes a Byte to the selected memory Bank. This function is
*                  used in Hardware mode only.
*                  Before calling this function, send a Write Enable command to 
*                  the selected memory Bank using SMI_SendWENCmd() function.
* Input          : - WriteAddr: external memory address from which the data will
*                    be written.
*                  - Data: data to be written to the external memory.
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_WriteByte(u32 WriteAddr, u8 Data)
{
  /* Transfer data to the memory */
  *(u8 *) WriteAddr = Data;
}

/*******************************************************************************
* Function Name  : SMI_WriteHalfWord
* Description    : Writes a Half Word to the selected memory Bank. This function
*                  is used in Hardware mode only.
*                  Before calling this function, send a Write Enable command to 
*                  the selected memory Bank using SMI_SendWENCmd() function.
* Input          : - WriteAddr: external memory address from which the data will
*                    be written.
*                  - Data: data to be written to the external memory.
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_WriteHalfWord(u32 WriteAddr, u16 Data)
{
  /* Transfer data to the memory */
  *(u16 *) WriteAddr = Data;
}

/*******************************************************************************
* Function Name  : SMI_WriteWord
* Description    : Writes a Word to the selected memory Bank. This function is
*                  used in Hardware mode only.
*                  Before calling this function, send a Write Enable command to 
*                  the selected memory Bank using SMI_SendWENCmd() function.
* Input          : - WriteAddr: external memory address from which the data will
*                    be written.
*                  - Data: data to be written to the external memory.
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_WriteWord(u32 WriteAddr, u32 Data)
{
  /* Transfer data to the memory */
  *(u32 *) WriteAddr = Data;
}

/*******************************************************************************
* Function Name  : SMI_ReadByte
* Description    : Reads a Byte from the selected memory Bank. This function is
*                  used in Hardware mode only.
* Input          : - ReadAddr: external memory address to read from.
* Output         : None
* Return         : Data read from the external memory.
*******************************************************************************/
u8 SMI_ReadByte(u32 ReadAddr)
{
  return(*(u8 *) ReadAddr);
}

/*******************************************************************************
* Function Name  : SMI_ReadHalfWord
* Description    : Reads a Half Word from the selected memory Bank.
*                  This function is used in Hardware mode only.
* Input          : - ReadAddr: external memory address to read from.
* Output         : None
* Return         : Data read from the external memory.
*******************************************************************************/
u16 SMI_ReadHalfWord(u32 ReadAddr)
{
  return(*(u16 *) ReadAddr);
}

/*******************************************************************************
* Function Name  : SMI_ReadWord
* Description    : Reads a Word from the selected memory Bank. This function is
*                  used in Hardware mode only.
* Input          : - ReadAddr: external memory address to read from.
* Output         : None
* Return         : Data read from the external memory.
*******************************************************************************/
u32 SMI_ReadWord(u32 ReadAddr)
{
  return(*(u32 *) ReadAddr);
}

/*******************************************************************************
* Function Name  : SMI_ReadMemoryStatusRegister
* Description    : Reads the status register of the memory connected to the
*                  selected Bank.
* Input          : None
* Output         : None
* Return         : External memory status register value.
*******************************************************************************/
u8 SMI_ReadMemoryStatusRegister(void)
{
 return((u8) (SMI->SR & SMI_STATUSREGISTER_Mask));
}

/*******************************************************************************
* Function Name  : SMI_GetFlagStatus
* Description    : Checks whether the specified SMI flag is set or not.
* Input          : - SMI_FLAG: specifies the flag to check.
*                    This parameter can be one of the following values:
*                          - SMI_FLAG_Bank3_WM : Memory Bank3 Write Mode flag
*                          - SMI_FLAG_Bank2_WM : Memory Bank2 Write Mode flag
*                          - SMI_FLAG_Bank1_WM : Memory Bank1 Write Mode flag
*                          - SMI_FLAG_Bank0_WM : Memory Bank0 Write Mode flag
*                          - SMI_FLAG_ERF2 : Error Flag 2: Forbidden Write Request
*                          - SMI_FLAG_ERF1 : Error Flag 1: Forbidden Access
*                          - SMI_FLAG_WC : Write Complete flag
*                          - SMI_FLAG_TF : Transfer Finished flag
* Output         : None
* Return         : The new state of SMI_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus SMI_GetFlagStatus(u32 SMI_FLAG)
{
  if((SMI->SR & SMI_FLAG) != RESET)
  {
    return SET;
  }
  else
  {
    return RESET;
  }
}

/*******************************************************************************
* Function Name  : SMI_ClearFlag
* Description    : Clears the SMI抯 pending flags.
* Input          : - SMI_FLAG: specifies the flag to clear.
*                    This parameter can be any combination of the following values:
*                          - SMI_FLAG_ERF2 : Error Flag 2: Forbidden Write Request
*                          - SMI_FLAG_ERF1 : Error Flag 1: Forbidden Access
*                          - SMI_FLAG_WC : Write Complete flag
*                          - SMI_FLAG_TF : Transfer Finished flag
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_ClearFlag(u32 SMI_FLAG)
{
  SMI->SR &= ~SMI_FLAG;
}

/*******************************************************************************
* Function Name  : SMI_GetITStatus
* Description    : Checks whether the specified SMI interrupt has occurred or not.
* Input          : - SMI_FLAG: specifies the interrupt source to check.
*                    This parameter can be one of the following values:
*                          - SMI_IT_WC : Write Complete Interrupt
*                          - SMI_IT_TF : Transfer Finished Interrupt
* Output         : None
* Return         : The new state of SMI_IT (SET or RESET).
*******************************************************************************/
ITStatus SMI_GetITStatus(u32 SMI_IT)
{
  if(((SMI->CR2 & SMI_IT) != RESET) && ((SMI->SR & SMI_IT) != RESET))
  {
    return SET;
  }
  else
  {
    return RESET;
  }
}

/*******************************************************************************
* Function Name  : SMI_ClearITPendingBit
* Description    : Clears the SMI抯 interrupt pending bits.
* Input          : - SMI_FLAG: specifies the interrupts sources to clear.
*                    This parameter can be any combination of the following values:
*                          - SMI_IT_WC : Write Complete Interrupt
*                          - SMI_IT_TF : Transfer Finished Interrupt
* Output         : None
* Return         : None
*******************************************************************************/
void SMI_ClearITPendingBit(u32 SMI_IT)
{
  SMI->SR &= ~SMI_IT;
}

/******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/