73x_prccu.c

国外LPC2000系列的一些源程序,请大家快快下载

        /* return the value of the Main Clock MCLK*/
        return(Tmp_CLOCK2 * MUL_Factor /DIV_Factor) ;
      }
      else /* CSU_CKSEL bit Reset */
      {
        return Tmp_CLOCK2; /* Set the MCLK value to CLOCK2  */
      }
    }
    else /* CK2_16 bit reset */
    {
      /* Set the MCLK value to CLOCK2 / 16  */
      return (Tmp_CLOCK2 /16) ;
    }
  } /* end of if "PRCCU_CLOCK_Out"*/
}

/*******************************************************************************
* Function Name  : PRCCU_SetExtClkDiv
* Description    : Set EXTCLK Divider factor.
* Input          : ExtClkDiv : the value of the divider factor to set the Real
*                  Time Clock prescaling factors. This parameter can be one of 
*                  the following values: 2,4,8,16,32,64,128,256,512,1024.
* Output         : None.
* Return         : None.
*******************************************************************************/
void  PRCCU_SetExtClkDiv(u16 ExtClkDiv)
{
  u8 Rtcp = 0;

  /* Get the n Value of the ExtClkDiv = 2^n */
  while(ExtClkDiv != 2)
  {
    ExtClkDiv = ExtClkDiv >>1;
    Rtcp++ ;
  }
  /* Set the RTCPR[3:0] bits according to Rtpr value */
  PRCCU->RTCPR = Rtcp;
}

/*******************************************************************************
* Function Name  : PRCCU_EnterLPM
* Description    : Enter the selected Low Power Mode.
* Input          : PRCCU_LPM: low power mode to enter. This parameter can be one
*                   of the following values:
*                   - PRCCU_LPM_HALT
*                   - PRCCU_LPM_WFI
*                   - PRCCU_LPM_LPWFI
* Output         : None
* Return         : None
*******************************************************************************/
void PRCCU_EnterLPM (PRCCU_LPM NewLPM)
{
  switch ( NewLPM)
  {
    /* The sequence to enter HALT mode */
    case PRCCU_LPM_HALT :
    {
      /* Set the EN_HALT bit in the PRCCU_CCR register */
      PRCCU->CCR |= 0x800;
      /* Clear the SRESEN bit in the PRCCU_CCR register */
      PRCCU->CCR &= 0xFFF7;
      /* Set the HALT bit in the PRCCU_SMR register */
      PRCCU->SMR |= 0x2;
      break;
    }
    
    /* The sequence to enter Wait For Interrupt mode */
    case PRCCU_LPM_WFI :
    {
      /* Clear the WFI bit in the PRCCU_SMR register*/
      PRCCU->SMR &= 0x0 ;
      break;
    }

    /* The sequence to enter LP Wait For Interrupt mode */
    case PRCCU_LPM_LPWFI :
    {
      /* Set Low Power mode during Wait For Interrupt bit LPOWFI */
      PRCCU->CCR |= 0x01;
      /* Clear WFI_CKSEL bit in PRCCU_CCR register */
      PRCCU->CCR &= 0xFFFFFFFD;
      /* Clear the WFI bit in the PRCCU_SMR register*/
      PRCCU->SMR &= 0x0 ;
      break;
    }
  }
}

/*******************************************************************************
* Function Name  : PRCCU_ITConfig
* Description    : Enables or disables the specified PRCCU interrupts.
* Input          : PRCCU_IT: specifies the PRCCU interrupts sources to be enabled
*                  or disabled. This parameter can be any combination of the
*                  following values:
*                       - PRCCU_IT_LOCK
*                       - PRCCU_IT_STOP
*                       - PRCCU_IT_CLK2_16
*                  - NewState: new state of the specified PRCCU interrupts.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void PRCCU_ITConfig(u16 PRCCU_IT, FunctionalState NewState)
{
  if (NewState == ENABLE)
  {
    /* Set the equivalent interrupt mask bit in the CCR resgister */
    PRCCU->CCR |= PRCCU_IT;
  }
  else
  {
    /* ReSet the equivalent interrupt mask bit in the CCR resgister */
    PRCCU->CCR &= ~PRCCU_IT;
  }
}

/*******************************************************************************
* Function Name  : PRCCU_FlagStatus
* Description    : Checks whether the specified PRCCU flag is set or not.
* Input          : PRCCU_Flag: flag to check. This parameter can be one of the
*                  following values:
*                       - PRCCU_FLAG_LOCK
*                       - PRCCU_FLAG_SOFTRES
*                       - PRCCU_FLAG_WDGRES
*                       - PRCCU_FLAG_LVD_INT
*                       - PRCCU_FLAG_LOCK_I
*                       - PRCCU_FLAG_CK2_16_I
*                       - PRCCU_FLAG_STOP_I
*                       - PRCCU_FLAG_VROK
* Output         : None
* Return         : The new state of the PRCCU_Flag (SET or RESET).
*******************************************************************************/
FlagStatus PRCCU_FlagStatus(u16 PRCCU_Flag)
{
  /* Checks whether PRCCU_Flag is set or reset */
  if (PRCCU_Flag == PRCCU_FLAG_VROK)
  {
    if ((PRCCU->VRCTR & PRCCU_Flag) != RESET)
    {
      return SET;
    }
      else
    {
      return RESET;
    }
  }
  else
  {
    if ((PRCCU->CFR & PRCCU_Flag) != RESET)
    {
      return SET;
    }
    else
    {
      return RESET;
    }
  }
}

/*******************************************************************************
* Function Name  : PRCCU_FlagClear
* Description    : Clears the specified PRCCU flag.
* Input          : PRCCU_Flag: flag to clear. This parameter can be one of the
*                  following values:
*                       - PRCCU_FLAG_LOCK_I
*                       - PRCCU_FLAG_CK2_16_I
*                       - PRCCU_FLAG_STOP_I
* Output         : None
* Return         : None
*******************************************************************************/
void PRCCU_FlagClear(u16 PRCCU_Flag)
{
  /* Clear PRCCU_Flag */
  PRCCU->CFR = (PRCCU->CFR & 0xFFFF816B) | PRCCU_Flag;
}

/*******************************************************************************
* Function Name  : PRCCU_SwResetGenerate
* Description    : Generate a software reset when enabling the Halt bit.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void PRCCU_SwResetGenerate ( )
{
  /* Set the EN_HALT bit in the PRCCU_CCR register */
  PRCCU->CCR |= 0x808;

  /* Set the HALT bit in the PRCCU_SMR register */
  PRCCU->SMR |= 0x2;
}

/*******************************************************************************
* Function Name  : PRCCU_VRCmd
* Description    : Enable or Disable the main Voltage regulator in case of
*                  LPWFI low power mode and in the case of run mode.
* Input          : - V_Regulator : the voltage regulator to enable or to disable.
*                    this parameter can be:
*                       - PRCCU_VR_LPWFI : Main VR in LPWFI mode
*                       - PRCCU_VR_Run   : Main VR in Run mode
*                  - NewState: new state of the specified PRCCU interrupts.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void PRCCU_VRCmd(u8 V_Regulator, FunctionalState NewState)
{
  if (NewState == ENABLE)
  {
    switch(V_Regulator)
    {
      case PRCCU_VR_LPWFI : PRCCU->VRCTR |= V_Regulator; break;
      case PRCCU_VR_Run   : PRCCU->VRCTR &= V_Regulator; break;
    }
  }
  else
  {
    switch(V_Regulator)
    {
      case PRCCU_VR_LPWFI : PRCCU->VRCTR &= ~V_Regulator; break;
      case PRCCU_VR_Run   : PRCCU->VRCTR |= ~V_Regulator; break;
    }
  }
}

/*******************************************************************************
* Function Name  : PRCCU_LPVRCurrentConfig
* Description    : select the Low-Power Voltage Regulator Current Capability
*                 (the allowed values are 2;4;6)
* Input          : - Current_Capability : the LPVR Output Current to configure
*                    it can be one of the following values:
*                       - PRCCU_LPVR_Current_2
*                       - PRCCU_LPVR_Current_4
*                       - PRCCU_LPVR_Current_6
* Output         : None
* Return         : None
*******************************************************************************/
void PRCCU_LPVRCurrentConfig (u8 Current_Capability)
{
  /* Set the Low Power Voltage Regulator Current Capability bit LPVRCC[1:0]
    depending on the selected LPVR Output Current (mA)*/
  switch(Current_Capability)
  {
    case PRCCU_LPVR_Current_2 :   CFG->R1 |=0x3        ;                 break;
    case PRCCU_LPVR_Current_4 :   CFG->R1 &=0xFFFFFFFC ; CFG->R1 |=0x2 ; break;
    case PRCCU_LPVR_Current_6 :   CFG->R1 &=0xFFFFFFFC ;                 break;
  }
}

/******************* (C) COPYRIGHT 2005 STMicroelectronics *****END OF FILE****/