75x_mrcc.c

嵌入式实验源码。包括：电源管理、复位、时钟管理

    case MRCC_CKSYS_RTC:
      if((MRCC_PLL == MRCC_PLL_Disabled) || (MRCC_PLL == MRCC_PLL_NoChange))
      {    
        Status = SetCKSYS_RTC(MRCC_PLL);
      }
      break;

    default:
      Status = ERROR;
      break;
  }
  return Status;
}

/*******************************************************************************
* Function Name  : MRCC_HCLKConfig
* Description    : Configures the AHB clock (HCLK).
* Input          : - MRCC_HCLK: defines the AHB clock. This clock is derived
*                    from the system clock(CK_SYS).
*                    This parameter can be one of the following values:
*                          - MRCC_CKSYS_Div1: AHB clock = CK_SYS
*                          - MRCC_CKSYS_Div2: AHB clock = CK_SYS/2
*                          - MRCC_CKSYS_Div4: AHB clock = CK_SYS/4
*                          - MRCC_CKSYS_Div8: AHB clock = CK_SYS/8
* Output         : None
* Return         : None
*******************************************************************************/
void MRCC_HCLKConfig(u32 MRCC_HCLK)
{
  u32 Temp = 0;
  
  /* Clear HPRESC[1:0] bits */
  Temp = MRCC->CLKCTL & MRCC_HPRESC_Reset_Mask;
  
  /* Set HPRESC[1:0] bits according to MRCC_HCLK value */
  Temp |= MRCC_HCLK;
  
  /* Store the new value */
  MRCC->CLKCTL = Temp;  
}

/*******************************************************************************
* Function Name  : MRCC_CKTIMConfig
* Description    : Configures the TIM clock (CK_TIM).
* Input          : - MRCC_CKTIM: defines the TIM clock. This clock is derived
*                    from the AHB clock(HCLK).
*                    This parameter can be one of the following values:
*                          - MRCC_HCLK_Div1: TIM clock = HCLK
*                          - MRCC_HCLK_Div2: TIM clock = HCLK/2
*                          - MRCC_HCLK_Div4: TIM clock = HCLK/4
*                          - MRCC_HCLK_Div8: TIM clock = HCLK/8
* Output         : None
* Return         : None
*******************************************************************************/
void MRCC_CKTIMConfig(u32 MRCC_CKTIM)
{
  u32 Temp = 0;
  
  /* Clear PPRESC[1:0] bits */
  Temp = MRCC->CLKCTL & MRCC_PPRESC_Reset_Mask;
  
  /* Set PPRESC[1:0] bits according to MRCC_CKTIM value */
  Temp |= MRCC_CKTIM;
  
  /* Store the new value */
  MRCC->CLKCTL = Temp;
}

/*******************************************************************************
* Function Name  : MRCC_PCLKConfig
* Description    : Configures the APB clock (PCLK).
* Input          : - MRCC_PCLK: defines the APB clock. This clock is derived 
*                    from the TIM clock(CK_TIM).
*                    This parameter can be one of the following values:
*                          - MRCC_CKTIM_Div1: APB clock = CKTIM
*                          - MRCC_CKTIM_Div2: APB clock = CKTIM/2
* Output         : None
* Return         : None
*******************************************************************************/
void MRCC_PCLKConfig(u32 MRCC_PCLK)
{
  if(MRCC_PCLK == MRCC_CKTIM_Div2)
  {
    MRCC->CLKCTL |= MRCC_CKTIM_Div2;
  }
  else
  {
    MRCC->CLKCTL &= MRCC_CKTIM_Div1;
  }
}

/*******************************************************************************
* Function Name  : MRCC_CKRTCConfig
* Description    : Configures the RTC clock (CK_RTC).
* Input          : - MRCC_CKRTC: specifies the clock source to be used as RTC
*                    clock.
*                    This parameter can be one of the following values:
*                          - MRCC_CKRTC_OSC4M_Div128
*                          - MRCC_CKRTC_OSC32K (OSC32K must be previously enabled
*                            using MRCC_OSC32KConfig() function)
*                          - MRCC_CKRTC_LPOSC (LPOSC must be previously enabled
*                            using MRCC_LPOSCConfig() function)
* Output         : None
* Return         : An ErrorStatus enumuration value:
*                         - SUCCESS: Clock configuration succeeded
*                         - ERROR: Clock configuration failed
*******************************************************************************/
ErrorStatus MRCC_CKRTCConfig(u32 MRCC_CKRTC)
{
  u32 Tmp = 0;

  if(((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET) &&
     ((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET))
  { 
    /* CK_RTC used as CK_SYS clock source */
    return ERROR;
  }
  else
  {    
    /* Clear CKRTCSEL[1:0] bits */
    Tmp = MRCC->PWRCTRL & MRCC_CKRTCSEL_Reset_Mask;

    /* Set CKRTCSEL[1:0] bits according to MRCC_CKRTC value */
    Tmp |= MRCC_CKRTC;

    /* Store the new value */
    MRCC->PWRCTRL = Tmp;       
  }

  return SUCCESS;
}

/*******************************************************************************
* Function Name  : MRCC_CKUSBConfig
* Description    : Configures the USB clock(CK_USB).
* Input          : - MRCC_CKUSB: specifies the clock source to be used as USB
*                    clock.
*                    This parameter can be one of the following values:
*                          - MRCC_CKUSB_Internal(CK_PLL2 enabled)
*                          - MRCC_CKUSB_External(CK_PLL2 disabled)
* Output         : None
* Return         : An ErrorStatus enumuration value:
*                         - SUCCESS: Clock configuration succeeded
*                         - ERROR: Clock configuration failed
*******************************************************************************/
ErrorStatus MRCC_CKUSBConfig(u32 MRCC_CKUSB)
{
  if(MRCC_CKUSB == MRCC_CKUSB_External)
  {
    /* Disable CK_PLL2 */
    MRCC->CLKCTL &= MRCC_PLL2EN_Reset_Mask;

    /* External USB clock selected */
    MRCC->CLKCTL |= MRCC_CKUSB_External;
  }
  else
  {
    if((MRCC->CLKCTL & MRCC_PLLEN_LOCK_Mask) != RESET)
    { /* PLL enabled and locked */
      
      /* Enable CK_PLL2 */
      MRCC->CLKCTL |= MRCC_PLL2EN_Set_Mask;

      /* Internal USB clock selected */
      MRCC->CLKCTL &= MRCC_CKUSB_Internal;
    }
    else
    {
      /* PLL not enabled */
      return ERROR;
    }
  }

  return SUCCESS;  
}

/*******************************************************************************
* Function Name  : MRCC_ITConfig
* Description    : Enables or disables the specified MRCC interrupts.
* Input          : - MRCC_IT: specifies the MRCC interrupts sources to be
*                    enabled or disabled. This parameter can be any combination
*                    of the following values:
*                          - MRCC_IT_LOCK: PLL lock interrupt
*                          - MRCC_IT_NCKD: No Clock detected interrupt
*                  - NewState: new state of the MRCC interrupts.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void MRCC_ITConfig(u32 MRCC_IT, FunctionalState NewState)
{
  if(NewState == ENABLE)
  {
    MRCC->CLKCTL |= MRCC_IT;
  }
  else
  {
    MRCC->CLKCTL &= ~MRCC_IT;
  }
}

/*******************************************************************************
* Function Name  : MRCC_PeripheralClockConfig
* Description    : Enables or disables the specified peripheral clock.
* Input          : - MRCC_Peripheral: specifies the peripheral to gates its
*                    clock. More than one peripheral can be selected using
*                    the 搢