00. Table of Contents
Article Directory
01. Overview
Many microcontrollers have low power consumption modes, and STM32F4 is no exception. After the system or power is reset, the microcontroller is in operation. The HCLK in the running state provides the clock for the CPU, and the core executes the program code. When the CPU does not need to continue to run, multiple low-power modes can be used to save power, such as when waiting for an external event. The user needs to select an optimal low power consumption mode based on the lowest power consumption, fastest startup time, and available wake-up sources.
In the stm32f4xx_pwr.c and stm32f4xx_pwr.h files.
02. Related types
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))
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))
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))
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))
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))
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))
03. Related functions
/* 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);
04. Structure package
/**
* @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;
05. Reserved
06. Appendix
6.1 [STM32] STM32 series tutorial summary
Website: [STM32] STM32 series tutorial summary
07. Statement
This tutorial refers to the "STM32 F4 Development Guide" of Punctual Atom