/**
* @brief Reset the RCC clock configuration to the default reset state.
* @note The default reset state of the clock configuration is given below:
* - HSI ON and used as system clock source
* - HSE and PLL OFF
* - AHB and APB1 prescaler set to 1.
* - CSS, MCO OFF
* - All interrupts disabled
* @note This function doesn't modify the configuration of the
* - Peripheral clocks
* - LSI, LSE and RTC clocks
* @retval An ErrorStatus enumeration value:
* - SUCCESS: RCC registers are de-initialized
* - ERROR: not applicable
*/
ErrorStatus LL_RCC_DeInit(void)
{
uint32_t vl_mask = 0U;
/* Set HSION bit */
LL_RCC_HSI_Enable();
/* Set HSITRIM bits to the reset value*/
LL_RCC_HSI_SetCalibTrimming(0x10U);
/* Reset SW, HPRE, PPRE and MCOSEL bits */
vl_mask = 0xFFFFFFFFU;
CLEAR_BIT(vl_mask, (RCC_CFGR_SW | RCC_CFGR_HPRE | RCC_CFGR_PPRE | RCC_CFGR_MCOSEL));
LL_RCC_WriteReg(CFGR, vl_mask);
/* Reset HSEON, CSSON, PLLON bits */
vl_mask = 0xFFFFFFFFU;
CLEAR_BIT(vl_mask, (RCC_CR_PLLON | RCC_CR_CSSON | RCC_CR_HSEON));
LL_RCC_WriteReg(CR, vl_mask);
/* Reset HSEBYP bit */
LL_RCC_HSE_DisableBypass();
/* Reset CFGR register */
LL_RCC_WriteReg(CFGR, 0x00000000U);
#if defined(RCC_HSI48_SUPPORT)
/* Reset CR2 register */
LL_RCC_WriteReg(CR2, 0x00000000U);
/* Disable HSI48 */
LL_RCC_HSI48_Disable();
#endif /*RCC_HSI48_SUPPORT*/
/* Set HSI14TRIM/HSI14ON/HSI14DIS bits to the reset value*/
LL_RCC_HSI14_SetCalibTrimming(0x10U);
LL_RCC_HSI14_Disable();
LL_RCC_HSI14_EnableADCControl();
/* Reset CFGR2 register */
LL_RCC_WriteReg(CFGR2, 0x00000000U);
/* Reset CFGR3 register */
LL_RCC_WriteReg(CFGR3, 0x00000000U);
/* Clear pending flags */
#if defined(RCC_HSI48_SUPPORT)
vl_mask = (LL_RCC_CIR_LSIRDYC | LL_RCC_CIR_LSERDYC | LL_RCC_CIR_HSIRDYC | LL_RCC_CIR_HSERDYC | LL_RCC_CIR_PLLRDYC | LL_RCC_CIR_HSI14RDYC | LL_RCC_CIR_HSI48RDYC | LL_RCC_CIR_CSSC);
#else
vl_mask = (LL_RCC_CIR_LSIRDYC | LL_RCC_CIR_LSERDYC | LL_RCC_CIR_HSIRDYC | LL_RCC_CIR_HSERDYC | LL_RCC_CIR_PLLRDYC | LL_RCC_CIR_HSI14RDYC | LL_RCC_CIR_CSSC);
#endif /* RCC_HSI48_SUPPORT */
SET_BIT(RCC->CIR, vl_mask);
/* Disable all interrupts */
LL_RCC_WriteReg(CIR, 0x00000000U);
return SUCCESS;
}
/**
* @brief Reset the RCC clock configuration to the default reset state.
* @note The default reset state of the clock configuration is given below:
* - MSI ON and used as system clock source
* - HSE, HSI and PLL OFF
* - AHB, APB1 and APB2 prescaler set to 1.
* - CSS, MCO OFF
* - All interrupts disabled
* @note This function doesn't modify the configuration of the
* - Peripheral clocks
* - LSI, LSE and RTC clocks
* @retval An ErrorStatus enumeration value:
* - SUCCESS: RCC registers are de-initialized
* - ERROR: not applicable
*/
ErrorStatus LL_RCC_DeInit(void)
{
uint32_t vl_mask = 0U;
/* Set MSION bit */
LL_RCC_MSI_Enable();
/* Insure MSIRDY bit is set before writing default MSIRANGE value */
while (LL_RCC_MSI_IsReady() == 0U)
{
__NOP();
}
/* Set MSIRANGE default value */
LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_5);
/* Set MSITRIM bits to the reset value*/
LL_RCC_MSI_SetCalibTrimming(0U);
/* Set HSITRIM bits to the reset value*/
LL_RCC_HSI_SetCalibTrimming(0x10U);
/* Reset SW, HPRE, PPRE and MCOSEL bits */
vl_mask = 0xFFFFFFFFU;
CLEAR_BIT(vl_mask, (RCC_CFGR_SW | RCC_CFGR_HPRE | RCC_CFGR_PPRE1 | RCC_CFGR_PPRE2 | RCC_CFGR_MCOSEL));
LL_RCC_WriteReg(CFGR, vl_mask);
/* Reset HSI, HSE, PLL */
vl_mask = LL_RCC_ReadReg(CR);
#if defined(RCC_CR_HSIOUTEN)
CLEAR_BIT(vl_mask, RCC_CR_HSION| RCC_CR_HSIKERON| RCC_CR_HSIDIVEN | RCC_CR_HSIOUTEN | \
RCC_CR_HSEON | RCC_CR_PLLON);
#else
CLEAR_BIT(vl_mask, RCC_CR_HSION| RCC_CR_HSIKERON| RCC_CR_HSIDIVEN | \
RCC_CR_HSEON | RCC_CR_PLLON);
#endif
LL_RCC_WriteReg(CR, vl_mask);
/* Delay after an RCC peripheral clock */
vl_mask = LL_RCC_ReadReg(CR);
/* Reset HSEBYP bit */
LL_RCC_HSE_DisableBypass();
/* Set RCC_CR_RTCPRE to 0b00*/
CLEAR_BIT(vl_mask, RCC_CR_RTCPRE);
LL_RCC_WriteReg(CR, vl_mask);
/* Reset CFGR register */
LL_RCC_WriteReg(CFGR, 0x00000000U);
#if defined(RCC_HSI48_SUPPORT)
/* Reset CRRCR register */
LL_RCC_WriteReg(CRRCR, 0x00000000U);
/* Disable HSI48 */
LL_RCC_HSI48_Disable();
#endif /*RCC_HSI48_SUPPORT*/
/* Disable all interrupts */
LL_RCC_WriteReg(CIER, 0x00000000U);
return SUCCESS;
}