主函数内容：

HAL_Init();SystemClock_Config();MX_GPIO_Init();MX_DMA_Init();MX_ADC_Init();MX_LPUART1_UART_Init();MX_USART1_UART_Init();MX_RTC_Init();WorkFinished=0;//工作没有完成while(1){ LED1_ON; LED2_ON; LED3_ON;HAL_Delay (500);printf ("Before Stop \r\n");if(WorkFinished){ HAL_PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);//进入停止模式}LED1_OFF; LED2_OFF; LED3_OFF;printf ("After Stop \r\n"); }

//用于停机模式的声明

#define PWR_Regulator_LowPower ((uint32_t)0x00000001)#define PWR_STOPEntry_WFI ((uint8_t)0x01)

//系统的停机函数

void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry){ uint32_t tmpreg = 0U;/ Check the parameters /assert_param(IS_PWR_REGULATOR(Regulator));assert_param(IS_PWR_STOP_ENTRY(STOPEntry));/ Select the regulator state in Stop mode ---------------------------------/tmpreg = PWR->CR;/ Clear PDDS and LPDS bits /CLEAR_BIT(tmpreg, (PWR_CR_PDDS | PWR_CR_LPSDSR));/ Set LPSDSR bit according to PWR_Regulator value /SET_BIT(tmpreg, Regulator);/ Store the new value /PWR->CR = tmpreg;/ Set SLEEPDEEP bit of Cortex System Control Register /SET_BIT(SCB->SCR, SCB_SCR_SLEEPDEEP_Msk);/ Select Stop mode entry --------------------------------------------------/if(STOPEntry == PWR_STOPENTRY_WFI){ / Request Wait For Interrupt /WFI();}else{ / Request Wait For Event /SEV();WFE();WFE();}/ Reset SLEEPDEEP bit of Cortex System Control Register /CLEAR_BIT(SCB->SCR, SCB_SCR_SLEEPDEEP_Msk);}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)

{ WorkFinished=~WorkFinished;SystemClock_Config();printf ("Callback \r\n"); //外设中断 打印}

程序正常启动后三个灯闪烁(PB12|PB13|PB14)，按键后进入停机模式，再按键程序继续执行，再按键停机。

停机模式下耗电：148uA。