在手册360页有提到选择位的寄存器位置。
然后查看头文件，找到DCDC关键字。
- /*---------------------------------------------------------------------------------------------------------*/
- /* PLCTL constant definitions. (Write-Protection Register) */
- /*---------------------------------------------------------------------------------------------------------*/
- #define SYS_PLCTL_PLSEL_PL0 (0x0UL<<SYS_PLCTL_PLSEL_Pos) /*!< Set power level to power level 0 */
- #define SYS_PLCTL_PLSEL_PL1 (0x1UL<<SYS_PLCTL_PLSEL_Pos) /*!< Set power level to power level 1 */
- #define SYS_PLCTL_MVRS_LDO (0x0UL<<SYS_PLCTL_MVRS_Pos) /*!< Set main voltage regulator type to LDO */
- #define SYS_PLCTL_MVRS_DCDC (0x1UL<<SYS_PLCTL_MVRS_Pos) /*!< Set main voltage regulator type to DCDC */
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] Set Main Voltage Regulator Type
- * @param[in] u32PowerRegulator is main voltage regulator type. Including :
- * - \ref SYS_PLCTL_MVRS_LDO
- * - \ref SYS_PLCTL_MVRS_DCDC
- * @retval 0 main voltage regulator type setting is not finished
- * @retval 1 main voltage regulator type setting is finished
- * [url=home.php?mod=space&uid=1543424]@Details[/url] This function set main voltage regulator type.
- * The main voltage regulator type setting to DCDC cannot finished if the inductor is not detected.
- * The register write-protection function should be disabled before using this function.
- */
- uint32_t SYS_SetPowerRegulator(uint32_t u32PowerRegulator)
- {
- int32_t i32TimeOutCnt = 400;
- uint32_t u32Ret = 1U;
- uint32_t u32PowerRegStatus;
- /* Get main voltage regulator type status */
- u32PowerRegStatus = SYS->PLSTS & SYS_PLSTS_CURMVR_Msk;
- /* Set main voltage regulator type */
- if((u32PowerRegulator == SYS_PLCTL_MVRS_DCDC) && (u32PowerRegStatus == SYS_PLSTS_CURMVR_LDO))
- {
- /* Set main voltage regulator type to DCDC if status is LDO */
- SYS->PLCTL |= SYS_PLCTL_MVRS_Msk;
- /* Wait induction detection and main voltage regulator type change ready */
- while((SYS->PLSTS & SYS_PLSTS_CURMVR_Msk) != SYS_PLSTS_CURMVR_DCDC)
- {
- if(i32TimeOutCnt-- <= 0)
- {
- u32Ret = 0U; /* Main voltage regulator type change time-out */
- break;
- }
- }
- }
- else if(u32PowerRegulator == SYS_PLCTL_MVRS_LDO)
- {
- /* Set main voltage regulator type to LDO if status is DCDC */
- SYS->PLCTL &= (~SYS_PLCTL_MVRS_Msk);
- /* Wait main voltage regulator type change ready */
- while((SYS->PLSTS & SYS_PLSTS_CURMVR_Msk) != SYS_PLSTS_CURMVR_LDO)
- {
- if(i32TimeOutCnt-- <= 0)
- {
- u32Ret = 0U; /* Main voltage regulator type change time-out */
- break;
- }
- }
- }
- /* Clear main voltage regulator type change error flag */
- if(SYS->PLSTS & SYS_PLSTS_MVRCERR_Msk)
- {
- SYS->PLSTS = SYS_PLSTS_MVRCERR_Msk;
- u32Ret = 0U;
- }
- return u32Ret;
- }
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