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/******************** (C) COPYRIGHT 2006 STMicroelectronics ********************
* File Name : 75x_mrcc.c
* Author : MCD Application Team
* Date First Issued : 03/10/2006
* Description : This file provides all the MRCC software functions.
********************************************************************************
* History:
* 07/17/2006 : V1.0
* 03/10/2006 : V0.1
********************************************************************************
* 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 "75x_mrcc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define MRCC_FLAG_Mask 0x1F /* MRCC Flag Mask */
/* MRCC_PWRCTRL mask bits */
#define MRCC_LP_Set_Mask 0x00000001
#define MRCC_LP_Reset_Mask 0xFFFFFFFE
#define MRCC_SWRESET_Mask 0x00000002
#define MRCC_WFI_Mask 0x00000004
#define MRCC_STANDBY_Mask 0x00000006
#define MRCC_LPMC_Reset_Mask 0xFFFFFFF9
#define MRCC_LPDONE_Reset_Mask 0xFFFFFF7F
#define MRCC_LPPARAM_Reset_Mask 0xFFFF1FFF
#define MRCC_WFIParam_Reset_Mask 0xFFFF1FEF
#define MRCC_CKRTCSEL_Set_Mask 0x03000000
#define MRCC_CKRTCSEL_Reset_Mask 0xFCFFFFFF
#define MRCC_CKRTCOK_Mask 0x08000000
#define MRCC_LPOSCEN_Mask 0x10000000
#define MRCC_OSC32KEN_Mask 0x20000000
/* MRCC_CLKCTL mask bits */
#define MRCC_PPRESC_Set_Mask 0x00000003
#define MRCC_PPRESC_Reset_Mask 0xFFFFFFFC
#define MRCC_PPRESC2_Mask 0x00000004
#define MRCC_HPRESC_Set_Mask 0x00000018
#define MRCC_HPRESC_Reset_Mask 0xFFFFFFE7
#define MRCC_MCOS_Reset_Mask 0xFFFFFF3F
#define MRCC_XTDIV2_Set_Mask 0x00008000
#define MRCC_XTDIV2_Reset_Mask 0xFFFF7FFF
#define MRCC_OSC4MBYP_Set_Mask 0x00010000
#define MRCC_OSC4MBYP_Reset_Mask 0xFFFEFFFF
#define MRCC_OSC4MOFF_Set_Mask 0x00020000
#define MRCC_OSC4MOFF_Reset_Mask 0xFFFDFFFF
#define MRCC_NCKDF_Set_Mask 0x00040000
#define MRCC_NCKDF_Reset_Mask 0xFFFBFFFF
#define MRCC_CKOSCSEL_Set_Mask 0x00200000
#define MRCC_CKOSCSEL_Reset_Mask 0xFFDFFFFF
#define MRCC_CKUSBSEL_Mask 0x00400000
#define MRCC_CKSEL_Set_Mask 0x00800000
#define MRCC_CKSEL_Reset_Mask 0xFF7FFFFF
#define MRCC_CKSEL_CKOSCSEL_Mask 0x00A00000
#define MRCC_PLLEN_Set_Mask 0x01000000
#define MRCC_PLLEN_Reset_Mask 0xFEFFFFFF
#define MRCC_PLL2EN_Set_Mask 0x02000000
#define MRCC_PLL2EN_Reset_Mask 0xFDFFFFFF
#define MRCC_MX_Set_Mask 0x18000000
#define MRCC_MX_Reset_Mask 0xE7FFFFFF
#define MRCC_LOCK_Mask 0x80000000
#define MRCC_PLLEN_LOCK_Mask 0x81000000
/* Typical Value of the OSC4M in Hz */
#define OSC4M_Value 4000000
/* Typical Value of the OSC4M divided by 128 (used to clock the RTC) in Hz */
#define OSC4M_Div128_Value 31250
/* Typical Value of the OS32K Oscillator Frequency in Hz */
#define OSC32K_Value 32768
/* Typical Reset Value of the Internal LPOSC Oscillator Frequency in Hz */
#define LPOSC_Value 245000
/* Typical Reset Value of the Internal FREEOSC Oscillator Frequency in Hz */
#define FREEOSC_Value 5000000
/* Time out for OSC4M start up */
#define OSC4MStartUp_TimeOut 0xFE
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static ErrorStatus SetCKSYS_FREEOSC(void);
static ErrorStatus SetCKSYS_OSC4M(u32 PLL_State);
static ErrorStatus SetCKSYS_OSC4MPLL(u32 PLL_Mul);
static ErrorStatus SetCKSYS_RTC(u32 PLL_State);
static void WriteLPBit(void);
static void WriteCKOSCSELBit(void);
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : MRCC_DeInit
* Description : Deinitializes the MRCC peripheral registers to their default
* reset values.
* - Depending on the system clock state, some bits in MRCC_CLKCTL
* register can’t be reset.
* - The OSC32K, LPOSC and RTC clock selection configuration
* bits in MRCC_PWRCTRL register are not cleared by this
* function. To reset those bits, use the dedicated functions
* available within this driver.
* - The MRCC_RFSR, MRCC_BKP0 and MRCC_BKP1 registers are not
* reset by this function.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void MRCC_DeInit(void)
{
/* Try to clear NCKDF bit */
MRCC->CLKCTL &= MRCC_NCKDF_Reset_Mask;
if((MRCC->CLKCTL & MRCC_NCKDF_Set_Mask) != RESET)
{/* No clock detected on OSC4M */
/* Reset LOCKIE, LOCKIF, CKUSBSEL, NCKDIE, OSC4MOFF, OSC4MBYP, MCOS[1:0],
MCOP, HPRESC[1:0], PPRES[2:0] bits */
MRCC->CLKCTL &= 0x9FB40000;
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{
/* Clear CKOSCSEL bit --------------------------------------------------*/
/* Execute CKOSCSEL bit writing sequence */
WriteCKOSCSELBit();
}
}
else
{/* Clock present on OSC4M */
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{
/* Reset CKSEL bit */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
/* Clear CKOSCSEL bit --------------------------------------------------*/
/* Execute CKOSCSEL bit writing sequence */
WriteCKOSCSELBit();
}
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) == RESET)
{
/* Set CKSEL bit */
MRCC->CLKCTL |= MRCC_CKSEL_Set_Mask;
}
/* Disable PLL */
MRCC->CLKCTL &= MRCC_PLLEN_Reset_Mask;
/* Reset LOCKIE, LOCKIF, MX[1:0], CKUSBSEL, NCKDIE, MCOS[1:0], MCOP,
HPRESC[1:0], PPRES[2:0] bits */
MRCC->CLKCTL &= 0x87B70000;
/* Reset CKSEL bit */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
/* Reset OSC4MOFF and OSC4MBYP bits */
MRCC->CLKCTL &= 0xFFFCFFFF;
}
/* Reset RTCM, EN33V, LP_PARAM[15:13], WFI_FLASH_EN, LPMC_DBG and LPMC[1:0] bits */
MRCC->PWRCTRL &= 0xFBFE1FE1;
/* Reset PCLKEN register bits */
MRCC->PCLKEN = 0x00;
/* Reset PSWRES register bits */
MRCC->PSWRES = 0x00;
/* Clear NCKDF bit */
MRCC->CLKCTL &= MRCC_NCKDF_Reset_Mask;
}
/*******************************************************************************
* Function Name : MRCC_XTDIV2Config
* Description : Enables or disables the oscillator divider by 2. This function
* must not be used when the PLL is enabled.
* Input : - MRCC_XTDIV2: specifies the new state of the oscillator
* divider by 2.
* This parameter can be one of the following values:
* - MRCC_XTDIV2_Disable: oscillator divider by 2 disbaled
* - MRCC_XTDIV2_Enable: oscillator divider by 2 enbaled
* Output : None
* Return : None
*******************************************************************************/
void MRCC_XTDIV2Config(u32 MRCC_XTDIV2)
{
if(MRCC_XTDIV2 == MRCC_XTDIV2_Enable)
{
MRCC->CLKCTL |= MRCC_XTDIV2_Enable;
}
else
{
MRCC->CLKCTL &= MRCC_XTDIV2_Disable;
}
}
/*******************************************************************************
* Function Name : MRCC_CKSYSConfig
* Description : Configures the system clock (CK_SYS).
* Input : - MRCC_CKSYS: specifies the clock source used as system clock.
* This parameter can be one of the following values:
* - MRCC_CKSYS_FREEOSC
* - MRCC_CKSYS_OSC4M
* - MRCC_CKSYS_OSC4MPLL
* - MRCC_CKSYS_RTC (RTC clock source must be previously
* configured using MRCC_CKRTCConfig() function)
* : - MRCC_PLL: specifies the PLL configuration.
* This parameter can be one of the following values:
* - MRCC_PLL_Disabled: PLL disabled
* - MRCC_PLL_NoChange: No change on PLL configuration
* - MRCC_PLL_Mul_12: Multiplication by 12
* - MRCC_PLL_Mul_14: Multiplication by 14
* - MRCC_PLL_Mul_15: Multiplication by 15
* - MRCC_PLL_Mul_16: Multiplication by 16
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
ErrorStatus MRCC_CKSYSConfig(u32 MRCC_CKSYS, u32 MRCC_PLL)
{
ErrorStatus Status = ERROR;
switch(MRCC_CKSYS)
{
case MRCC_CKSYS_FREEOSC:
if((MRCC_PLL == MRCC_PLL_Disabled) || (MRCC_PLL == MRCC_PLL_NoChange))
{
Status = SetCKSYS_FREEOSC();
}
break;
case MRCC_CKSYS_OSC4M:
if((MRCC_PLL == MRCC_PLL_Disabled) || (MRCC_PLL == MRCC_PLL_NoChange))
{
Status = SetCKSYS_OSC4M(MRCC_PLL);
}
break;
case MRCC_CKSYS_OSC4MPLL:
if((MRCC_PLL == MRCC_PLL_Mul_12) || (MRCC_PLL == MRCC_PLL_Mul_14) ||
(MRCC_PLL == MRCC_PLL_Mul_15) || (MRCC_PLL == MRCC_PLL_Mul_16))
{
Status = SetCKSYS_OSC4MPLL(MRCC_PLL);
}
break;
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 “|” operator.
* - NewState: new state of the specified peripheral clock.
* This parameter can be one of the following values:
* - ENABLE: the selected peripheral clock is enabled
* - DISABLE: the selected peripheral clock is disabled
* Output : None
* Return : None
*******************************************************************************/
void MRCC_PeripheralClockConfig(u32 MRCC_Peripheral, FunctionalState NewState)
{
if(NewState == ENABLE)
{
MRCC->PCLKEN |= MRCC_Peripheral;
}
else
{
MRCC->PCLKEN &= ~MRCC_Peripheral;
}
}
/*******************************************************************************
* Function Name : MRCC_PeripheralSWResetConfig
* Description : Forces or releases peripheral software reset.
* Input : - MRCC_Peripheral: specifies the peripheral to reset. More
* than one peripheral can be selected using the “|” operator.
* - NewState: new state of the specified peripheral software
* reset. This parameter can be one of the following values:
* - ENABLE: the selected peripheral is kept under reset
* - DISABLE: the selected peripheral exits from reset
* Output : None
* Return : None
*******************************************************************************/
void MRCC_PeripheralSWResetConfig(u32 MRCC_Peripheral, FunctionalState NewState)
{
if(NewState == ENABLE)
{
MRCC->PSWRES |= MRCC_Peripheral;
}
else
{
MRCC->PSWRES &= ~MRCC_Peripheral;
}
}
/*******************************************************************************
* Function Name : MRCC_GetClocksStatus
* Description : Returns the status and frequencies of different on chip clocks.
* Don’t use this function when CK_SYS is clocked by an external
* clock source (OSC4M bypassed).
* Input : - MRCC_ClocksStatus: pointer to a MRCC_ClocksTypeDef structure
* which will hold the clocks information.
* Output : None
* Return : None
*******************************************************************************/
void MRCC_GetClocksStatus(MRCC_ClocksTypeDef* MRCC_ClocksStatus)
{
u32 PLLMul = 0;
u32 Temp = 0;
u32 Presc = 0;
/* Get the Status of PLL */
if((MRCC->CLKCTL & MRCC_PLLEN_Set_Mask) == RESET)
{
MRCC_ClocksStatus->PLL_Status = OFF;
}
else
{
MRCC_ClocksStatus->PLL_Status = ON;
}
/* Get the Status of OSC4M */
if((MRCC->CLKCTL & MRCC_OSC4MOFF_Set_Mask) == RESET)
{
MRCC_ClocksStatus->OSC4M_Status = ON;
}
else
{
MRCC_ClocksStatus->OSC4M_Status = OFF;
}
/* Get the Status of LPOSC */
if((MRCC->PWRCTRL & MRCC_LPOSCEN_Mask) == RESET)
{
MRCC_ClocksStatus->LPOSC_Status = OFF;
}
else
{
MRCC_ClocksStatus->LPOSC_Status = ON;
}
/* Get the Status of OSC32K */
if((MRCC->PWRCTRL & MRCC_OSC32KEN_Mask) == RESET)
{
MRCC_ClocksStatus->OSC32K_Status = OFF;
}
else
{
MRCC_ClocksStatus->OSC32K_Status = ON;
}
/* Get CKU_SB source ---------------------------------------------------------*/
if((MRCC->CLKCTL & MRCC_CKUSBSEL_Mask) != RESET)
{
MRCC_ClocksStatus->CKUSB_Source = External;
}
else
{
if((MRCC->CLKCTL & MRCC_PLL2EN_Set_Mask) != RESET)
{
MRCC_ClocksStatus->CKUSB_Source = Internal;
}
else
{
MRCC_ClocksStatus->CKUSB_Source = Disabled;
}
}
/* Get CK_RTC source ---------------------------------------------------------*/
Temp = MRCC->PWRCTRL & MRCC_CKRTCSEL_Set_Mask;
Temp = Temp >> 24;
switch(Temp)
{
case 0x00:
MRCC_ClocksStatus->CKRTC_Source = Disabled;
break;
case 0x01:
MRCC_ClocksStatus->CKRTC_Source = OSC4M_Div128;
break;
case 0x02:
MRCC_ClocksStatus->CKRTC_Source = OSC32K;
break;
case 0x03:
MRCC_ClocksStatus->CKRTC_Source = LPOSC;
break;
default:
MRCC_ClocksStatus->CKRTC_Source = Disabled;
break;
}
/* Get CK_SYS source ---------------------------------------------------------*/
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET)
{/* CK_OSC used as CK_SYS clock source */
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{ /* CK_RTC used as CK_OSC clock source */
MRCC_ClocksStatus->CKSYS_Source = CKRTC;
if(MRCC_ClocksStatus->CKRTC_Source == OSC32K)
{
/* CK_SYS clock frequency */
MRCC_ClocksStatus->CKSYS_Frequency = OSC32K_Value;
}
else if(MRCC_ClocksStatus->CKRTC_Source == LPOSC)
{
/* CK_SYS clock frequency */
MRCC_ClocksStatus->CKSYS_Frequency = LPOSC_Value;
}
else if(MRCC_ClocksStatus->CKRTC_Source == OSC4M_Div128)
{
/* CK_SYS clock frequency */
MRCC_ClocksStatus->CKSYS_Frequency = OSC4M_Div128_Value;
}
}
else
{ /* OSC4M used as CK_OSC clock source */
MRCC_ClocksStatus->CKSYS_Source = OSC4M;
if((MRCC->CLKCTL & MRCC_XTDIV2_Set_Mask) != RESET)
{
/* CK_SYS clock frequency */
MRCC_ClocksStatus->CKSYS_Frequency = Main_Oscillator >> 1;
}
else
{
/* CK_SYS clock frequency */
MRCC_ClocksStatus->CKSYS_Frequency = Main_Oscillator;
}
}
}
else
{/* CK_PLL1 used as CK_SYS clock */
if(MRCC_ClocksStatus->PLL_Status == OFF)
{ /* FREEOSC used as CK_PLL1 clock source */
MRCC_ClocksStatus->CKSYS_Source = FREEOSC;
/* CK_SYS clock frequency */
MRCC_ClocksStatus->CKSYS_Frequency = FREEOSC_Value;
}
else
{ /* OSC4M followed by PLL used as CK_PLL1 clock source */
MRCC_ClocksStatus->CKSYS_Source = OSC4MPLL;
/* Get PLL factor ------------------------------------------------------*/
Temp = MRCC->CLKCTL & MRCC_MX_Set_Mask;
Temp = Temp >> 27;
switch(Temp)
{
case 0x00:
PLLMul = 16;
break;
case 0x01:
PLLMul = 15;
break;
case 0x02:
PLLMul = 14;
break;
case 0x03:
PLLMul = 12;
break;
default:
PLLMul = 16;
break;
}
/* CK_SYS clock frequency */
MRCC_ClocksStatus->CKSYS_Frequency = OSC4M_Value * PLLMul;
}
}
/* Compute HCLK, CKTIM and PCLK clocks frequencies ---------------------------*/
/* Get HCLK prescaler */
Presc = MRCC->CLKCTL & MRCC_HPRESC_Set_Mask;
Presc = Presc >> 3;
/* HCLK clock frequency */
MRCC_ClocksStatus->HCLK_Frequency = MRCC_ClocksStatus->CKSYS_Frequency >> Presc;
/* Get CK_TIM prescaler */
Presc = MRCC->CLKCTL & MRCC_PPRESC_Set_Mask;
/* CK_TIM clock frequency */
MRCC_ClocksStatus->CKTIM_Frequency = MRCC_ClocksStatus->HCLK_Frequency >> Presc;
/* Get PCLK prescaler */
Presc = MRCC->CLKCTL & MRCC_PPRESC2_Mask;
Presc = Presc >> 2;
/* PCLK clock frequency */
MRCC_ClocksStatus->PCLK_Frequency = MRCC_ClocksStatus->CKTIM_Frequency >> Presc;
}
/*******************************************************************************
* Function Name : MRCC_LPMC_DBGonfig
* Description : Enables or disables the Low Power Debug Mode.
* Input : - MRCC_LPDM: specifies the LPDM new state value.
* This parameter can be one of the following values:
* - MRCC_LPDM_Disable
* - MRCC_LPDM_Enable
* Output : None
* Return : None
*******************************************************************************/
void MRCC_LPMC_DBGConfig(u32 MRCC_LPDM)
{
if(MRCC_LPDM == MRCC_LPDM_Enable)
{
MRCC->PWRCTRL |= MRCC_LPDM_Enable;
}
else
{
MRCC->PWRCTRL &= MRCC_LPDM_Disable;
}
}
/*******************************************************************************
* Function Name : MRCC_EnterWFIMode
* Description : Enters WFI mode.
* If the Flash is used in Burst mode, it must be kept enabled
* in WFI mode(use MRCC_WFIParam_FLASHOn as parameter)
* Input : - MRCC_WFIParam: specifies the WFI mode control parameters.
* This parameter can be one of the following values:
* - MRCC_WFIParam_FLASHPowerDown(DMA not allowed during WFI)
* - MRCC_WFIParam_FLASHOn(DMA allowed during WFI)
* - MRCC_WFIParam_FLASHOff(DMA not allowed during WFI)
* Output : None
* Return : None
*******************************************************************************/
void MRCC_EnterWFIMode(u32 MRCC_WFIParam)
{
/* Low Power mode configuration ----------------------------------------------*/
/* Clear LPMC[1:0] bits */
MRCC->PWRCTRL &= MRCC_LPMC_Reset_Mask;
/* Select WFI mode */
MRCC->PWRCTRL |= MRCC_WFI_Mask;
/* Low Power mode control parameters configuration ---------------------------*/
/* Clear LP_PARAM[15:13] and WFI_FLASH_EN bits */
MRCC->PWRCTRL &= MRCC_WFIParam_Reset_Mask;
if(MRCC_WFIParam != MRCC_WFIParam_FLASHPowerDown)
{
/* Set LP_PARAM[15:13] and WFI_FLASH_EN bits according to MRCC_WFIParam value */
MRCC->PWRCTRL |= MRCC_WFIParam;
}
/* Execute the Low Power bit writing sequence --------------------------------*/
WriteLPBit();
}
/*******************************************************************************
* Function Name : MRCC_EnterSTOPMode
* Description : Enters STOP mode.
* Input : - MRCC_STOPParam: specifies the STOP mode control parameters.
* This parameter can be one of the following values:
* - MRCC_STOPParam_Default (OSC4M On, FLASH On, MVREG On)
* - MRCC_STOPParam_OSC4MOff
* - MRCC_STOPParam_FLASHOff
* - MRCC_STOPParam_MVREGOff
* Output : None
* Return : None
*******************************************************************************/
void MRCC_EnterSTOPMode(u32 MRCC_STOPParam)
{
/* Low Power mode configuration ----------------------------------------------*/
/* Clear LPMC[1:0] bits (STOP mode is selected) */
MRCC->PWRCTRL &= MRCC_LPMC_Reset_Mask;
/* Low Power mode control parameters configuration ---------------------------*/
/* Clear LP_PARAM[15:13] bits */
MRCC->PWRCTRL &= MRCC_LPPARAM_Reset_Mask;
if(MRCC_STOPParam != MRCC_STOPParam_Default)
{
/* Set LP_PARAM[15:13] bits according to MRCC_STOPParam value */
MRCC->PWRCTRL |= MRCC_STOPParam;
}
/* Execute the Low Power bit writing sequence --------------------------------*/
WriteLPBit();
}
/*******************************************************************************
* Function Name : MRCC_EnterSTANDBYMode
* Description : Enters STANDBY mode.
* Make sure that WKPF flag is cleared before using this function.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void MRCC_EnterSTANDBYMode(void)
{
/* Low Power mode configuration ----------------------------------------------*/
/* Clear LPMC[1:0] bits */
MRCC->PWRCTRL &= MRCC_LPMC_Reset_Mask;
/* Select STANDBY mode */
MRCC->PWRCTRL |= MRCC_STANDBY_Mask;
/* Execute the Low Power bit writing sequence --------------------------------*/
WriteLPBit();
}
/*******************************************************************************
* Function Name : MRCC_GenerateSWReset
* Description : Generates a system software reset.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void MRCC_GenerateSWReset(void)
{
/* Low Power mode configuration ----------------------------------------------*/
/* Clear LPMC[1:0] bits */
MRCC->PWRCTRL &= MRCC_LPMC_Reset_Mask;
/* Select software reset */
MRCC->PWRCTRL |= MRCC_SWRESET_Mask;
/* Execute the Low Power bit writing sequence --------------------------------*/
WriteLPBit();
}
/*******************************************************************************
* Function Name : MRCC_WriteBackupRegister
* Description : Writes user data to the specified backup register.
* Input : - MRCC_BKP: specifies the backup register.
* This parameter can be one of the following values:
* - MRCC_BKP0
* - MRCC_BKP1
* - Data: data to write.
* Output : None
* Return : None
*******************************************************************************/
void MRCC_WriteBackupRegister(MRCC_BKPReg MRCC_BKP, u32 Data)
{
if(MRCC_BKP == MRCC_BKP0)
{
MRCC->BKP0 = Data;
}
else
{
MRCC->BKP1 = Data;
}
}
/*******************************************************************************
* Function Name : MRCC_ReadBackupRegister
* Description : Reads data from the specified backup register.
* Input : - MRCC_BKP: specifies the backup register.
* This parameter can be one of the following values:
* - MRCC_BKP0
* - MRCC_BKP1
* Output : None
* Return : The content of the specified backup register.
*******************************************************************************/
u32 MRCC_ReadBackupRegister(MRCC_BKPReg MRCC_BKP)
{
if(MRCC_BKP == MRCC_BKP0)
{
return(MRCC->BKP0);
}
else
{
return(MRCC->BKP1);
}
}
/*******************************************************************************
* Function Name : MRCC_IOVoltageRangeConfig
* Description : Configures the I/O pins voltage range.
* Input : - MRCC_IOVoltageRange: specifies the I/O pins voltage range.
* This parameter can be one of the following values:
* - MRCC_IOVoltageRange_5V
* - MRCC_IOVoltageRange_3V3
* Output : None
* Return : None
*******************************************************************************/
void MRCC_IOVoltageRangeConfig(u32 MRCC_IOVoltageRange)
{
if(MRCC_IOVoltageRange == MRCC_IOVoltageRange_3V3)
{
MRCC->PWRCTRL |= MRCC_IOVoltageRange_3V3;
}
else
{
MRCC->PWRCTRL &= MRCC_IOVoltageRange_5V;
}
}
/*******************************************************************************
* Function Name : MRCC_MCOConfig
* Description : Selects the clock source to output on MCO pin (P0.1).
* To output the clock, the associated alternate function must
* be enabled in the I/O port controller.
* Input : - MRCC_MCO: specifies the clock source to output.
* This parameter can be one of the following values:
* - MRCC_MCO_HCLK
* - MRCC_MCO_PCLK
* - MRCC_MCO_OSC4M
* - MRCC_MCO_CKPLL2
* - MRCC_MCOPrescaler: specifies if prescaler, divide by 1 or 2,
* is applied to this clock before outputting it to MCO pin.
* This parameter can be one of the following values:
* - MRCC_MCOPrescaler_1
* - MRCC_MCOPrescaler_2
* Output : None
* Return : None
*******************************************************************************/
void MRCC_MCOConfig(u32 MRCC_MCO, u32 MCO_MCOPrescaler)
{
u32 Temp = 0;
/* MCO prescaler configuration -----------------------------------------------*/
if(MCO_MCOPrescaler == MRCC_MCOPrescaler_2)
{
MRCC->CLKCTL |= MRCC_MCOPrescaler_2;
}
else
{
MRCC->CLKCTL &= MRCC_MCOPrescaler_1;
}
/* MCO selection configuration -----------------------------------------------*/
/* Clear MCOS[1:0] bits */
Temp = MRCC->CLKCTL & MRCC_MCOS_Reset_Mask;
/* Set MCOS[1:0] bits according to MRCC_MCO value */
Temp |= MRCC_MCO;
/* Store the new value */
MRCC->CLKCTL = Temp;
}
/*******************************************************************************
* Function Name : MRCC_OSC4MConfig
* Description : Configures the 4MHz main oscillator (OSC4M).
* This function must be used when the CK_SYS is not clocked
* by the OSC4M and the PLL is not enabled.
* Input : - MRCC_OSC4M: specifies the new state of the OSC4M oscillator.
* This parameter can be one of the following values:
* - MRCC_OSC4M_Default: OSC4M enabled, bypass disabled
* - MRCC_OSC4M_Disable: OSC4M disabled
* - MRCC_OSC4M_Bypass: OSC4M bypassed
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
ErrorStatus MRCC_OSC4MConfig(u32 MRCC_OSC4M)
{
ErrorStatus Status = SUCCESS;
/* If CK_SYS is driven by OSC4M or the PLL is enabled, exit ------------------*/
if(((MRCC->CLKCTL & MRCC_CKSEL_CKOSCSEL_Mask) == MRCC_CKSEL_Set_Mask) ||
(((MRCC->CLKCTL & MRCC_CKSEL_CKOSCSEL_Mask) == MRCC_CKSEL_CKOSCSEL_Mask) &&
((MRCC->PWRCTRL & MRCC_CKRTCSEL_Reset_Mask) != RESET))||
((MRCC->CLKCTL & MRCC_PLLEN_Set_Mask) != RESET))
{
Status = ERROR;
}
/* Else configure the OSC4MOFF and OSC4MBYP bits -----------------------------*/
else
{
switch(MRCC_OSC4M)
{
case MRCC_OSC4M_Default:
MRCC->CLKCTL &= MRCC_OSC4MOFF_Reset_Mask & MRCC_OSC4MBYP_Reset_Mask;
break;
case MRCC_OSC4M_Disable:
MRCC->CLKCTL &= MRCC_OSC4MBYP_Reset_Mask;
MRCC->CLKCTL |= MRCC_OSC4MOFF_Set_Mask;
break;
case MRCC_OSC4M_Bypass:
MRCC->CLKCTL &= MRCC_OSC4MOFF_Reset_Mask;
MRCC->CLKCTL |= MRCC_OSC4MBYP_Set_Mask;
break;
default:
Status = ERROR;
break;
}
}
return Status;
}
/*******************************************************************************
* Function Name : MRCC_OSC32KConfig
* Description : Configures the OSC32K oscillator.
* This function must be used when the CK_SYS is not clocked by
* the CK_RTC.
* Input : - MRCC_OSC32K: specifies the new state of the OSC32K oscillator.
* This parameter can be one of the following values:
* - MRCC_OSC32K_Disable: OSC32K disabled
* - MRCC_OSC32K_Enable: OSC32K enabled
* - MRCC_OSC32KBypass: specifies if the OSC32K oscillator is
* bypassed or not.
* This parameter can be one of the following values:
* - MRCC_OSC32KBypass_Disable: OSC32K selected
* - MRCC_OSC32KBypass_Enable: OSC32K bypassed
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
ErrorStatus MRCC_OSC32KConfig(u32 MRCC_OSC32K, u32 MRCC_OSC32KBypass)
{
/* If CK_SYS is driven by CK_RTC, exit ---------------------------------------*/
if(((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET) &&
((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET))
{
return ERROR;
}
/* Else configure the OSC32KEN and OSC32KBYP bits ----------------------------*/
else
{
/* Configure OSC32KEN bit */
if(MRCC_OSC32K == MRCC_OSC32K_Enable)
{
MRCC->PWRCTRL |= MRCC_OSC32K_Enable;
}
else
{
MRCC->PWRCTRL &= MRCC_OSC32K_Disable;
}
/* Configure OSC32KBYP bit */
if(MRCC_OSC32KBypass == MRCC_OSC32KBypass_Enable)
{
MRCC->PWRCTRL |= MRCC_OSC32KBypass_Enable;
}
else
{
MRCC->PWRCTRL &= MRCC_OSC32KBypass_Disable;
}
return SUCCESS;
}
}
/*******************************************************************************
* Function Name : MRCC_LPOSCConfig
* Description : Enables or disables the LPOSC oscillator.
* This function must be used when the CK_SYS is not clocked by
* the CK_RTC.
* Input : - MRCC_LPOSC: specifies the new state of the LPOSC oscillator.
* This parameter can be one of the following values:
* - MRCC_LPOSC_Disable: LPOSC disabled
* - MRCC_LPOSC_Enable: LPOSC enabled
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
ErrorStatus MRCC_LPOSCConfig(u32 MRCC_LPOSC)
{
/* If CK_SYS is driven by CK_RTC or LPOSC is used as CK_RTC clock source, exit*/
if((((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET) &&
((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)) ||
((MRCC->PWRCTRL & MRCC_CKRTCSEL_Set_Mask) == MRCC_CKRTC_LPOSC))
{
return ERROR;
}
/* Else configure the LPOSCEN bit --------------------------------------------*/
else
{
if(MRCC_LPOSC == MRCC_LPOSC_Enable)
{
MRCC->PWRCTRL |= MRCC_LPOSC_Enable;
}
else
{
MRCC->PWRCTRL &= MRCC_LPOSC_Disable;
}
return SUCCESS;
}
}
/*******************************************************************************
* Function Name : MRCC_RTCMConfig
* Description : Enables or disables RTC clock measurement.
* Input : - MRCC_RTCM: specifies whether CK_RTC is connected to TB
* timer IC1 or not.
* This parameter can be one of the following values:
* - MRCC_RTCM_Disable: CK_RTC not connected to TB timer IC1
* - MRCC_RTCM_Enable: CK_RTC connected to TB timer IC1
* Output : None
* Return : None
*******************************************************************************/
void MRCC_RTCMConfig(u32 MRCC_RTCM)
{
if(MRCC_RTCM == MRCC_RTCM_Enable)
{
MRCC->PWRCTRL |= MRCC_RTCM_Enable;
}
else
{
MRCC->PWRCTRL &= MRCC_RTCM_Disable;
}
}
/*******************************************************************************
* Function Name : MRCC_SetBuilderCounter
* Description : Sets the builder counter value which defines the delay for
* the 4MHz main oscillator (OSC4M) clock to be stabilized.
* Input : - BuilderCounter: defines the delay for the OSC4M oscillator
* clock to be stabilized.
* Output : None
* Return : None
*******************************************************************************/
void MRCC_SetBuilderCounter(u8 BuilderCounter)
{
*(u8 *) 0x60000026 = BuilderCounter;
}
/*******************************************************************************
* Function Name : MRCC_GetCKSYSCounter
* Description : Gets the result of the delay applied to CK_SYS before
* starting the CPU.
* Input : None
* Output : None
* Return : SCOUNT value.
*******************************************************************************/
u16 MRCC_GetCKSYSCounter(void)
{
return((u16)(MRCC->RFSR & 0x0FFF));
}
/*******************************************************************************
* Function Name : MRCC_GetFlagStatus
* Description : Checks whether the specified MRCC flag is set or not.
* Input : - MRCC_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* - MRCC_FLAG_LOCK: PLL Locked flag
* - MRCC_FLAG_LOCKIF: PLL Lock Interrupt status flag
* - MRCC_FLAG_CKSEL: CK_SYS source staus flag
* - MRCC_FLAG_CKOSCSEL: CK_OSC clock source staus flag
* - MRCC_FLAG_NCKD: No Clock Detected flag
* - MRCC_FLAG_SWR: Software Reset flag
* - MRCC_FLAG_WDGR: Watchdog Reset flag
* - MRCC_FLAG_EXTR: External Reset flag
* - MRCC_FLAG_WKP: Wake-Up flag
* - MRCC_FLAG_STDB: STANDBY flag
* - MRCC_FLAG_BCOUNT: Builder Counter Flag
* - MRCC_FLAG_OSC32KRDY: Oscillator 32K Ready
* - MRCC_FLAG_CKRTCOK: CK_RTC OK
* - MRCC_FLAG_LPDONE: Low Power Bit Sequence has been performed
* - MRCC_FLAG_LP: Low Power Mode Entry
* Output : None
* Return : The new state of MRCC_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus MRCC_GetFlagStatus(u8 MRCC_FLAG)
{
u32 MRCCReg = 0, FlagPos = 0;
u32 StatusReg = 0;
/* Get the MRCC register index */
MRCCReg = MRCC_FLAG >> 5;
/* Get the flag position */
FlagPos = MRCC_FLAG & MRCC_FLAG_Mask;
if(MRCCReg == 1) /* The flag to check is in CLKCTL register */
{
StatusReg = MRCC->CLKCTL;
}
else if (MRCCReg == 2) /* The flag to check is in RFSR register */
{
StatusReg = MRCC->RFSR;
}
else if(MRCCReg == 3) /* The flag to check is in PWRCTRL register */
{
StatusReg = MRCC->PWRCTRL;
}
if((StatusReg & (1 << FlagPos))!= RESET)
{
return SET;
}
else
{
return RESET;
}
}
/*******************************************************************************
* Function Name : MRCC_ClearFlag
* Description : Clears the MRCC’s pending flags.
* Input : - MRCC_FLAG: specifies the flag to clear.
* This parameter can be one of the following values:
* - MRCC_FLAG_NCKD: No Clock Detected flag
* - MRCC_FLAG_SWR: Software Reset flag
* - MRCC_FLAG_WDGR: Watchdog Reset flag
* - MRCC_FLAG_EXTR: External Reset flag
* - MRCC_FLAG_WKP: Wake-Up flag
* - MRCC_FLAG_STDB: STANDBY flag
* - MRCC_FLAG_LPDONE: Low Power Bit Sequence has been performed
* Output : None
* Return : None
*******************************************************************************/
void MRCC_ClearFlag(u8 MRCC_FLAG)
{
u32 MRCCReg = 0, FlagPos = 0;
/* Get the MRCC register index */
MRCCReg = MRCC_FLAG >> 5;
/* Get the flag position */
FlagPos = MRCC_FLAG & MRCC_FLAG_Mask;
if(MRCCReg == 1) /* The flag to clear is in CLKCTL register */
{
MRCC->CLKCTL &= ~(1 << FlagPos);
}
else if (MRCCReg == 2) /* The flag to clear is in RFSR register */
{
MRCC->RFSR &= ~(1 << FlagPos);
}
else if(MRCCReg == 3) /* The flag to clear is in PWRCTRL register */
{
MRCC->PWRCTRL &= ~(1 << FlagPos);
}
}
/*******************************************************************************
* Function Name : MRCC_GetITStatus
* Description : Checks whether the specified MRCC interrupt has occurred or not.
* Input : - MRCC_IT: specifies the MRCC interrupt source to check.
* This parameter can be one of the following values:
* - MRCC_IT_LOCK: PLL lock interrupt
* - MRCC_IT_NCKD: No Clock detected interrupt
* Output : None
* Return : The new state of MRCC_IT (SET or RESET).
*******************************************************************************/
ITStatus MRCC_GetITStatus(u32 MRCC_IT)
{
/* Check the specified interrupt pending bit */
if((MRCC->CLKCTL & (MRCC_IT >> 1)) != RESET)
{
return SET;
}
else
{
return RESET;
}
}
/*******************************************************************************
* Function Name : MRCC_ClearITPendingBit
* Description : Clears the MRCC’s interrupt pending bits.
* Input : - MRCC_IT: specifies the interrupt pending bit to clear.
* This parameter can be any combination of the following
* values:
* - MRCC_IT_LOCK: PLL lock interrupt
* - MRCC_IT_NCKD: No Clock detected interrupt
* Output : None
* Return : None
*******************************************************************************/
void MRCC_ClearITPendingBit(u32 MRCC_IT)
{
/* Clear the specified interrupt pending bit */
MRCC->CLKCTL &= ~(MRCC_IT >> 1);
}
/*******************************************************************************
* Function Name : MRCC_WaitForOSC4MStartUp
* Description : Waits for OSC4M start-up.
* Input : None
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: OSC4M oscillator is stable and ready to use
* - ERROR: no clock is detected on OSC4M
*******************************************************************************/
ErrorStatus MRCC_WaitForOSC4MStartUp(void)
{
u32 StartUpCounter = 0;
do
{
/* Clear No Clock Detected flag */
if(MRCC_GetFlagStatus(MRCC_FLAG_NCKD) != RESET)
{
MRCC_ClearFlag(MRCC_FLAG_NCKD);
}
StartUpCounter++;
}while((MRCC_GetFlagStatus(MRCC_FLAG_BCOUNT) == RESET)&&
(StartUpCounter != OSC4MStartUp_TimeOut));
if(MRCC_GetFlagStatus(MRCC_FLAG_BCOUNT) != RESET)
{
return SUCCESS;
}
else
{
return ERROR;
}
}
/*******************************************************************************
* Function Name : SetCKSYS_FREEOSC
* Description : Selects FREEOSC as CK_SYS clock source.
* Input : None
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
static ErrorStatus SetCKSYS_FREEOSC(void)
{
/* Check if the PLL is enabled */
if((MRCC->CLKCTL & MRCC_PLLEN_Set_Mask) != RESET)
{
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) == RESET)
{ /* CK_PLL1 used as Ck_SYS clock source*/
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{/* Check if CK_RTC source clock is present*/
if((MRCC->PWRCTRL & MRCC_CKRTCSEL_Set_Mask) == RESET)
{
/* CK_RTC disabled*/
return ERROR;
}
}
/* Select CK_OSC as CK_SYS clock source */
MRCC->CLKCTL |= MRCC_CKSEL_Set_Mask;
}
/* Disable PLL */
MRCC->CLKCTL &= MRCC_PLLEN_Reset_Mask;
}
/* Select CK_PLL1 as CK_SYS clock source */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) == RESET)
{
return SUCCESS;
}
else
{
return ERROR;
}
}
/*******************************************************************************
* Function Name : SetCKSYS_OSC4M
* Description : Selects 4MHz main oscillator (OSC4M) as CK_SYS clock source.
* Input : PLL_State: specifies the PLL state.
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
static ErrorStatus SetCKSYS_OSC4M(u32 PLL_State)
{
/* If OSC4M is not present, exit ---------------------------------------------*/
if(((MRCC->CLKCTL & MRCC_NCKDF_Set_Mask) != RESET) ||
((MRCC->CLKCTL & MRCC_OSC4MOFF_Set_Mask) != RESET) )
{
/* OSC4M disabled or OSC4M clock is not present*/
return ERROR;
}
/* Else configure CKSEL and CKOSCSEL bits ------------------------------------*/
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{ /* CK_RTC used as CK_OSC clock */
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET)
{
/* Select CK_PLL1 as CK_SYS clock source */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
}
/* Clear CKOSCSEL bit ----------------------------------------------------*/
/* Execute CKOSCSEL bit writing sequence */
WriteCKOSCSELBit();
/* Check if CKOSCSEL is set to 0 */
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{
return ERROR;
}
}
/* Select CK_OSC as CK_SYS clock source */
MRCC->CLKCTL |= MRCC_CKSEL_Set_Mask;
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET)
{
if(PLL_State == MRCC_PLL_Disabled)
{
/* Disable PLL */
MRCC->CLKCTL &= MRCC_PLLEN_Reset_Mask;
}
return SUCCESS;
}
else
{
return ERROR;
}
}
/*******************************************************************************
* Function Name : SetCKSYS_OSC4MPLL
* Description : Selects 4MHz main oscillator (OSC4M) followed by PLL as
* CK_SYS clock source.
* Input : PLL_Mul: specifies the PLL factor.
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
static ErrorStatus SetCKSYS_OSC4MPLL(u32 PLL_Mul)
{
/* Check if 4MHz main oscillator clock is present */
if(((MRCC->CLKCTL & MRCC_NCKDF_Set_Mask) == RESET) &&
((MRCC->CLKCTL & MRCC_OSC4MOFF_Set_Mask) == RESET))
{
if(((MRCC->CLKCTL & MRCC_PLLEN_Set_Mask) != RESET) &&
((MRCC->CLKCTL & MRCC_MX_Set_Mask) == PLL_Mul))
{
/* Select CK_PLL1 as CK_SYS clock source */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) == RESET)
{
return SUCCESS;
}
else
{
return ERROR;
}
}
else
{
/* If CK_RTC is selected as CK_OSC clock source */
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET)
{
/* Clear CKSEL bit */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
}
/* Clear CKOSCSEL bit ------------------------------------------------*/
/* Execute CKOSCSEL bit writing sequence */
WriteCKOSCSELBit();
/* Check if CKOSCSEL is set to 0 */
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) != RESET)
{
return ERROR;
}
}
/* Select CK_OSC as CK_SYS clock source */
MRCC->CLKCTL |= MRCC_CKSEL_Set_Mask;
/* Disable PLL */
MRCC->CLKCTL &= MRCC_PLLEN_Reset_Mask;
/* Configure PLL factor */
if(PLL_Mul == MRCC_PLL_Mul_16)
{
MRCC->CLKCTL &= MRCC_MX_Reset_Mask;
}
else if((PLL_Mul == MRCC_PLL_Mul_15) || (PLL_Mul == MRCC_PLL_Mul_14) ||
(PLL_Mul == MRCC_PLL_Mul_12))
{
/* Clear MX[1:0] bits */
MRCC->CLKCTL &= MRCC_MX_Reset_Mask;
/* Set MX[1:0] bits according to PLL_Mul value */
MRCC->CLKCTL |= PLL_Mul;
}
if(Main_Oscillator == 4000000)
{/* 4 MHz external Quartz oscillator used as main oscillator */
/* Disable Oscillator Divider by 2 */
MRCC->CLKCTL &= MRCC_XTDIV2_Reset_Mask;
}
else if(Main_Oscillator == 8000000)
{/* 8 MHz external Quartz oscillator used as main oscillator */
/* Enable Oscillator Divider by 2 */
MRCC->CLKCTL |= MRCC_XTDIV2_Set_Mask;
}
/* Enable PLL */
MRCC->CLKCTL |= MRCC_PLLEN_Set_Mask;
/* Wait until the PLL is locked */
while((MRCC->CLKCTL & MRCC_LOCK_Mask) == RESET)
{
/* If OSC4M clock disapear or the PLL is disabled, exit */
if(((MRCC->CLKCTL & MRCC_NCKDF_Set_Mask) != RESET) ||
((MRCC->CLKCTL & MRCC_PLLEN_Set_Mask) == RESET))
{
return ERROR;
}
}
/* Select CK_PLL1 as CK_SYS clock source */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) == RESET)
{
return SUCCESS;
}
else
{
return ERROR;
}
}
}
else
{
/* OSC4M disabled or OSC4M clock is not present*/
return ERROR;
}
}
/*******************************************************************************
* Function Name : SetCKSYS_RTC
* Description : Selects RTC clock (CK_RTC) as CK_SYS clock source.
* Input : PLL_State: specifies the PLL state.
* Output : None
* Return : An ErrorStatus enumuration value:
* - SUCCESS: Clock configuration succeeded
* - ERROR: Clock configuration failed
*******************************************************************************/
static ErrorStatus SetCKSYS_RTC(u32 PLL_State)
{
/* Check if CK_RTC clock is enabled and ready to use */
if(((MRCC->PWRCTRL & MRCC_CKRTCSEL_Set_Mask) != RESET)||
((MRCC->CLKCTL & MRCC_CKRTCOK_Mask) == RESET))
{
/* Configure CK_RTC as Ck_SYS clock source -----------------------------------*/
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) == RESET)
{
/* Select CK_PLL1 as CK_SYS clock source */
MRCC->CLKCTL &= MRCC_CKSEL_Reset_Mask;
/* Set CKOSCSEL bit ----------------------------------------------------*/
/* Execute CKOSCSEL bit writing sequence */
WriteCKOSCSELBit();
/* Check if CKOSCSEL is set to 1 */
if((MRCC->CLKCTL & MRCC_CKOSCSEL_Set_Mask) == RESET)
{
return ERROR;
}
}
/* Select CK_OSC as CK_SYS clock source */
MRCC->CLKCTL |= MRCC_CKSEL_Set_Mask;
if((MRCC->CLKCTL & MRCC_CKSEL_Set_Mask) != RESET)
{
if(PLL_State == MRCC_PLL_Disabled)
{
/* Disable PLL */
MRCC->CLKCTL &= MRCC_PLLEN_Reset_Mask;
}
return SUCCESS;
}
else
{
return ERROR;
}
}
else
{
/* CK_RTC disabled */
return ERROR;
}
}
/*******************************************************************************
* Function Name : WriteLPBit
* Description : Executes the Low Power bit writing sequence.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
static void WriteLPBit(void)
{
u32 Tmp = 0, Tmp1 = 0, Tmp2 = 0;
/* Clear LP_DONE flag */
MRCC->PWRCTRL &= MRCC_LPDONE_Reset_Mask;
Tmp = MRCC->PWRCTRL;
Tmp1 = Tmp | MRCC_LP_Set_Mask;
Tmp2 = Tmp & MRCC_LP_Reset_Mask;
/* Set LP bit */
MRCC->PWRCTRL = Tmp1;
/* Set LP bit */
MRCC->PWRCTRL = Tmp1;
/* Reset LP bit */
MRCC->PWRCTRL = Tmp2;
/* Set LP bit */
MRCC->PWRCTRL = Tmp1;
/* Read LP bit*/
Tmp = MRCC->PWRCTRL;
}
/*******************************************************************************
* Function Name : WriteCKOSCSELBit
* Description : Executes the CKOSCSEL bit writing sequence.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
static void WriteCKOSCSELBit(void)
{
u32 Tmp = 0, Tmp1 = 0, Tmp2 = 0;
Tmp = MRCC->CLKCTL;
Tmp1 = Tmp | MRCC_CKOSCSEL_Set_Mask;
Tmp2 = Tmp & MRCC_CKOSCSEL_Reset_Mask;
/* Set CKOSCSEL bit */
MRCC->CLKCTL = Tmp1;
/* Set CKOSCSEL bit */
MRCC->CLKCTL = Tmp1;
/* Reset CKOSCSEL bit */
MRCC->CLKCTL = Tmp2;
/* Set CKOSCSEL bit */
MRCC->CLKCTL = Tmp1;
/* Read CKOSCSEL bit */
Tmp = MRCC->CLKCTL;
}
/******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/