stm32 stop2 mode cannot work when indpendent watchdog enable

[jiangpen]

Posted on November 11, 2016 at 10:25

I have an application which enables the watchdog and deepsleep(stop2). The deep sleep mode wakes up by RTC, and then wathcdog is refreshed. However, the MCU still resets by watchdog. I attached code below and I am not sure anything missing by using deepsleep and watchdog.

----------------------------------------------------------------    HAL_Init();          HAL_PWR_EnableBkUpAccess();     /* RTC Clock selection can be changed only if the Backup Domain is reset */   __HAL_RCC_BACKUPRESET_FORCE();   __HAL_RCC_BACKUPRESET_RELEASE();          LSIClock_Config();           __HAL_RCC_PWR_CLK_ENABLE();     /* Ensure that MSI is wake-up system clock */   __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_MSI);     while(1)     {                                refreshDOG(); //this will refresh watchdog, but               __HAL_RCC_GPIOA_CLK_ENABLE();     __HAL_RCC_GPIOB_CLK_ENABLE();     __HAL_RCC_GPIOC_CLK_ENABLE();       __HAL_RCC_GPIOD_CLK_ENABLE();     __HAL_RCC_GPIOE_CLK_ENABLE();     __HAL_RCC_GPIOF_CLK_ENABLE();     __HAL_RCC_GPIOG_CLK_ENABLE();     __HAL_RCC_GPIOH_CLK_ENABLE();         GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;     GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;     GPIO_InitStruct.Pull = GPIO_NOPULL;     GPIO_InitStruct.Pin = GPIO_PIN_All;     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);     HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);     HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);       HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);     HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);     HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);     HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);     HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);       __HAL_RCC_GPIOA_CLK_DISABLE();     __HAL_RCC_GPIOB_CLK_DISABLE();     __HAL_RCC_GPIOC_CLK_DISABLE();     __HAL_RCC_GPIOD_CLK_DISABLE();     __HAL_RCC_GPIOE_CLK_DISABLE();     __HAL_RCC_GPIOF_CLK_DISABLE();     __HAL_RCC_GPIOG_CLK_DISABLE();     __HAL_RCC_GPIOH_CLK_DISABLE();       /* Disable all used wakeup source */     HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle);                  HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 0x03FFF, RTC_WAKEUPCLOCK_RTCCLK_DIV16);       /* Enter STOP 2 mode */     HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);     /* Re-configure the system clock to 80 MHz based on MSI, enable and        select PLL as system clock source (PLL is disabled in STOP mode) */     SYSCLKConfig_STOP();     } #watchdog-deepsleep