01. 概述
很多单片机都有低功耗模式,STM32F4 也不例外。在系统或电源复位以后,微控制器处于运行状态。运行状态下的 HCLK 为 CPU 提供时钟,内核执行程序代码。当 CPU 不需继续运行时,可以利用多个低功耗模式来节省功耗,例如等待某个外部事件时。用户需要根据最低电源消耗,最快速启动时间和可用的唤醒源等条件,选定一个最佳的低功耗模式。
在stm32f4xx_pwr.c 和stm32f4xx_pwr.h 文件中。
02. 相关类型
PWR_PVD_detection_level
- /** @defgroup PWR_PVD_detection_level
- * @{
- */
- #define PWR_PVDLevel_0 PWR_CR_PLS_LEV0
- #define PWR_PVDLevel_1 PWR_CR_PLS_LEV1
- #define PWR_PVDLevel_2 PWR_CR_PLS_LEV2
- #define PWR_PVDLevel_3 PWR_CR_PLS_LEV3
- #define PWR_PVDLevel_4 PWR_CR_PLS_LEV4
- #define PWR_PVDLevel_5 PWR_CR_PLS_LEV5
- #define PWR_PVDLevel_6 PWR_CR_PLS_LEV6
- #define PWR_PVDLevel_7 PWR_CR_PLS_LEV7
- #define IS_PWR_PVD_LEVEL(LEVEL) (((LEVEL) == PWR_PVDLevel_0) || ((LEVEL) == PWR_PVDLevel_1)|| \
- ((LEVEL) == PWR_PVDLevel_2) || ((LEVEL) == PWR_PVDLevel_3)|| \
- ((LEVEL) == PWR_PVDLevel_4) || ((LEVEL) == PWR_PVDLevel_5)|| \
- ((LEVEL) == PWR_PVDLevel_6) || ((LEVEL) == PWR_PVDLevel_7))
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PWR_Regulator_state_in_STOP_mode
- /** @defgroup PWR_Regulator_state_in_STOP_mode
- * @{
- */
- #define PWR_MainRegulator_ON ((uint32_t)0x00000000)
- #define PWR_LowPowerRegulator_ON PWR_CR_LPDS
- /* --- PWR_Legacy ---*/
- #define PWR_Regulator_ON PWR_MainRegulator_ON
- #define PWR_Regulator_LowPower PWR_LowPowerRegulator_ON
- #define IS_PWR_REGULATOR(REGULATOR) (((REGULATOR) == PWR_MainRegulator_ON) || \
- ((REGULATOR) == PWR_LowPowerRegulator_ON))
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PWR_Regulator_state_in_UnderDrive_mode
- /** @defgroup PWR_Regulator_state_in_UnderDrive_mode
- * @{
- */
- #define PWR_MainRegulator_UnderDrive_ON PWR_CR_MRUDS
- #define PWR_LowPowerRegulator_UnderDrive_ON ((uint32_t)(PWR_CR_LPDS | PWR_CR_LPUDS))
- #define IS_PWR_REGULATOR_UNDERDRIVE(REGULATOR) (((REGULATOR) == PWR_MainRegulator_UnderDrive_ON) || \
- ((REGULATOR) == PWR_LowPowerRegulator_UnderDrive_ON))
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PWR_STOP_mode_entry
- /** @defgroup PWR_STOP_mode_entry
- * @{
- */
- #define PWR_STOPEntry_WFI ((uint8_t)0x01)
- #define PWR_STOPEntry_WFE ((uint8_t)0x02)
- #define IS_PWR_STOP_ENTRY(ENTRY) (((ENTRY) == PWR_STOPEntry_WFI) || ((ENTRY) == PWR_STOPEntry_WFE))
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PWR_Regulator_Voltage_Scale
- /** @defgroup PWR_Regulator_Voltage_Scale
- * @{
- */
- #define PWR_Regulator_Voltage_Scale1 ((uint32_t)0x0000C000)
- #define PWR_Regulator_Voltage_Scale2 ((uint32_t)0x00008000)
- #define PWR_Regulator_Voltage_Scale3 ((uint32_t)0x00004000)
- #define IS_PWR_REGULATOR_VOLTAGE(VOLTAGE) (((VOLTAGE) == PWR_Regulator_Voltage_Scale1) || \
- ((VOLTAGE) == PWR_Regulator_Voltage_Scale2) || \
- ((VOLTAGE) == PWR_Regulator_Voltage_Scale3))
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PWR_Flag
- /** @defgroup PWR_Flag
- * @{
- */
- #define PWR_FLAG_WU PWR_CSR_WUF
- #define PWR_FLAG_SB PWR_CSR_SBF
- #define PWR_FLAG_PVDO PWR_CSR_PVDO
- #define PWR_FLAG_BRR PWR_CSR_BRR
- #define PWR_FLAG_VOSRDY PWR_CSR_VOSRDY
- #define PWR_FLAG_ODRDY PWR_CSR_ODRDY
- #define PWR_FLAG_ODSWRDY PWR_CSR_ODSWRDY
- #define PWR_FLAG_UDRDY PWR_CSR_UDSWRDY
- /* --- FLAG Legacy ---*/
- #define PWR_FLAG_REGRDY PWR_FLAG_VOSRDY
- #define IS_PWR_GET_FLAG(FLAG) (((FLAG) == PWR_FLAG_WU) || ((FLAG) == PWR_FLAG_SB) || \
- ((FLAG) == PWR_FLAG_PVDO) || ((FLAG) == PWR_FLAG_BRR) || \
- ((FLAG) == PWR_FLAG_VOSRDY) || ((FLAG) == PWR_FLAG_ODRDY) || \
- ((FLAG) == PWR_FLAG_ODSWRDY) || ((FLAG) == PWR_FLAG_UDRDY))
- #define IS_PWR_CLEAR_FLAG(FLAG) (((FLAG) == PWR_FLAG_WU) || ((FLAG) == PWR_FLAG_SB) || \
- ((FLAG) == PWR_FLAG_UDRDY))
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03. 相关函数
- /* Function used to set the PWR configuration to the default reset state ******/
- void PWR_DeInit(void);
- /* Backup Domain Access function **********************************************/
- void PWR_BackupAccessCmd(FunctionalState NewState);
- /* PVD configuration functions ************************************************/
- void PWR_PVDLevelConfig(uint32_t PWR_PVDLevel);
- void PWR_PVDCmd(FunctionalState NewState);
- void PWR_WakeUpPinCmd(FunctionalState NewState);
- /* Main and Backup Regulators configuration functions *************************/
- void PWR_BackupRegulatorCmd(FunctionalState NewState);
- void PWR_MainRegulatorModeConfig(uint32_t PWR_Regulator_Voltage);
- void PWR_OverDriveCmd(FunctionalState NewState);
- void PWR_OverDriveSWCmd(FunctionalState NewState);
- void PWR_UnderDriveCmd(FunctionalState NewState);
- /* FLASH Power Down configuration functions ***********************************/
- void PWR_FlashPowerDownCmd(FunctionalState NewState);
- /* Low Power modes configuration functions ************************************/
- void PWR_EnterSTOPMode(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry);
- void PWR_EnterUnderDriveSTOPMode(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry);
- void PWR_EnterSTANDBYMode(void);
- /* Flags management functions *************************************************/
- FlagStatus PWR_GetFlagStatus(uint32_t PWR_FLAG);
- void PWR_ClearFlag(uint32_t PWR_FLAG);
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04. 结构体封装
- /**
- * @brief Power Control
- */
- typedef struct
- {
- __IO uint32_t CR; /*!< PWR power control register, Address offset: 0x00 */
- __IO uint32_t CSR; /*!< PWR power control/status register, Address offset: 0x04 */
- } PWR_TypeDef;
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