pcu.c

意法半导体STR710的驱动程序

/******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
* File Name          : pcu.c
* Author             : MCD Application Team
* Date First Issued  : 09/09/03
* Description        : This file provides all the Power Control Unit functions
********************************************************************************
* History:
*  13/01/2006 : V3.1
*  24/05/2005 : V3.0
*  30/11/2004 : V2.0
*  14/07/2004 : V1.3
*  01/01/2004 : V1.2
*******************************************************************************
 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.
*******************************************************************************/

#include "pcu.h"
#include "rccu.h"

/*******************************************************************************
* Function Name  : PCU_VRConfig
* Description    : This routine is used to configure PCU voltage regultors
* Input 1        : MVR : Main voltage Regulator
                   LPR : Low Power Regulator
* Input 2        : ENABLE : Enable the Voltage Regulator
                   DISABLE: Disable ( ByPass ) the VR
* Return         : None
*******************************************************************************/
void PCU_VRConfig ( PCU_VR Xvr, FunctionalState NewState )
{
  u16 Tmp = PCU->PWRCR;
  switch ( Xvr )
  {
    case PCU_MVR :
        /* Configure the Main Voltage Regulator */
        if (NewState == DISABLE) Tmp |= PCU_MVR_Mask; else Tmp &= ~PCU_MVR_Mask;
        break;
    case PCU_LPR :
        /* Configure the Low power Voltage Regulator */
        if (NewState == DISABLE) Tmp |= PCU_LPR_Mask; else Tmp &= ~PCU_LPR_Mask;
        break;
  }

  /* Wait until the previous write operation will be completed */
  while (( PCU->PWRCR & PCU_BUSY_Mask ) == 1);

  /*  Unlock Power Control Register */
  PCU->PWRCR |= PCU_WREN_Mask;
    PCU->PWRCR = Tmp | PCU_WREN_Mask;
}

/*******************************************************************************
* Function Name  : PCU_WFIEnter
* Description    : This routine is used to force the Device to enter in WFI mode
* Input 1        : CLOCK2_16 : Clock2_16 as system clock for WFI mode
*                  EXTERNAL  : external clock as system clock for WFI mode
* Input 2        : ENABLE : Enable Low Power Regulator during Wait For Interrupt Mode
*                  DISABLE: Disable Low Power Regulator during Wait For Interrupt Mode
* Input 3        : ENABLE : Enable Low Power Mode during Wait For Interrupt Mode
*                  DISABLE: Disable Low Power Mode during Wait For Interrupt Mode
* Return         : None
*******************************************************************************/
void PCU_WFIEnter ( WFI_CLOCKS Xclock, FunctionalState Xlpr, FunctionalState Xlpm )
{
  /* Select the WFI mode */
  /* Clear WFI bit in the RCCU_SMR register to enter in WFI mode */
  RCCU->SMR &=0xFE ;

  if (Xlpr == DISABLE )

  /* Wait until the previous write operation will be completed */
  while (( PCU->PWRCR & PCU_BUSY_Mask ) == 1);

  /* Unlock Power Control Register */
  PCU->PWRCR |= PCU_WREN_Mask;

  /* switched off the main Voltage Regulator in WFI mode */
  PCU->PWRCR  |=0x0010;;

  /* Select the LPWFI mode */
  if (Xlpm == ENABLE )

  /* Disable the flash during the LPWFI */
  FLASHR->CR0|=0x8000;

  if (Xclock == WFI_CLOCK2_16)
  /* Select the 32KHz as peripherl clock during LPWFI */
  RCCU->CCR  |=0x2;
    else
    /* Select CLK2/15 as peripherals clock during LPWFI */
    RCCU->CCR  &=~0x2;

    /* Set bit LOPWFI for selecting LPWFI mode */
    RCCU->CCR  |=0x1;

    /* Enter the LPWFI mode */
    RCCU->SMR &=0xFE;
}

/*******************************************************************************
* Function Name  : PCU_LPMEnter
* Description    : This routine is used to force the device to enter in low
*                  power modes
* Input          : PCU_SLOW    : Slow Mode
                   PCU_STOP    : Stop Mode
                   PCU_STANDBY : StandBy Mode
* Return         : None
*******************************************************************************/
void PCU_LPMEnter ( LPM_MODES Xmode  )
{
  u32 temp;
  switch ( Xmode )
    {
      /* Slow Mode */
      case PCU_SLOW:
        {
          RCCU->PLL1CR |= 0x87;
          RCCU_RCLKSourceConfig ( RCCU_PLL1_Output );
          break;
        }

      /* Stop Mode */
      case PCU_STOP:
        {
          /* Enable Stop EN bit */
          RCCU->CCR |= PCU_STOP_EN_Mask;

          /* Write '1' to Stop Bit */
          XTI->CTRL |= 0x04;

          /* Write '0' to Stop Bit */
          XTI->CTRL &= 0x03;

          /* Write '1' to Stop Bit */
          XTI->CTRL |= 0x04;

          /* Aadd Delay */

          temp = 0;
          temp = 1;
          temp = 2;
          temp = 3;
          temp = 4;
          temp = 5;
          temp = 6;
          temp = 7;
          temp = 8;

          break;

        }

      /* PCU_STANDBY Mode */
      case PCU_STANDBY:
        {
	  /* Wait until the previous write operation will be completed */
          while (( PCU->PWRCR & PCU_BUSY_Mask ) == 1);

          /* Unlock Power Control Register */
          PCU->PWRCR |= PCU_WREN_Mask;

	  /* Set the Power Down flag */
          PCU->PWRCR |= PCU_PWRDWN_Mask;
        }
    }
}
/******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/