00. 目录
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))
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. 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);
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;
05. 预留
06. 附录
6.1 【STM32】STM32系列教程汇总
07. 声明
该教程参考了正点原子的《STM32 F4 开发指南》