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+/* USER CODE BEGIN Header */
+/**
+ ******************************************************************************
+ * @file Examples_LL/PWR/PWR_EnterStandbyMode/Src/main.c
+ * @author MCD Application Team
+ * @brief This example describes how to enter and exit the Standby mode with
+ * a wakeup pin or external reset through the STM32WBxx PWR LL API.
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.
+ * All rights reserved.</center></h2>
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+
+/* Private includes ----------------------------------------------------------*/
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+/* Private typedef -----------------------------------------------------------*/
+/* USER CODE BEGIN PTD */
+
+/* USER CODE END PTD */
+
+/* Private define ------------------------------------------------------------*/
+/* USER CODE BEGIN PD */
+#define BUTTON_MODE_GPIO 0
+#define BUTTON_MODE_EXTI 1
+
+/* USER CODE END PD */
+
+/* Private macro -------------------------------------------------------------*/
+/* USER CODE BEGIN PM */
+
+/* USER CODE END PM */
+
+/* Private variables ---------------------------------------------------------*/
+
+/* USER CODE BEGIN PV */
+
+/* USER CODE END PV */
+
+/* Private function prototypes -----------------------------------------------*/
+void SystemClock_Config(void);
+static void MX_GPIO_Init(void);
+/* USER CODE BEGIN PFP */
+
+void Configure_PWR(void);
+void LED_Blinking(uint32_t Period);
+void UserButton_Init(uint32_t Button_Mode);
+uint32_t UserButton_GetState(void);
+void EnterStandbyMode(void);
+
+/* USER CODE END PFP */
+
+/* Private user code ---------------------------------------------------------*/
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+/**
+ * @brief The application entry point.
+ * @retval int
+ */
+int main(void)
+{
+ /* USER CODE BEGIN 1 */
+
+
+ /* USER CODE END 1 */
+
+ /* MCU Configuration--------------------------------------------------------*/
+
+ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
+
+
+ NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
+
+ /* System interrupt init*/
+
+ /* USER CODE BEGIN Init */
+
+ /* USER CODE END Init */
+
+ /* Configure the system clock */
+ SystemClock_Config();
+
+ /* USER CODE BEGIN SysInit */
+ /* Initialize User push-button (SW1) in GPIO mode */
+ UserButton_Init(BUTTON_MODE_GPIO);
+
+ /* USER CODE END SysInit */
+
+ /* Initialize all configured peripherals */
+ MX_GPIO_Init();
+ /* USER CODE BEGIN 2 */
+
+ /* Initialize User push-button (SW1) in EXTI mode */
+ UserButton_Init(BUTTON_MODE_EXTI);
+
+ /* Configure Power IP */
+ Configure_PWR();
+ /* Led blinking in Run mode */
+ LED_Blinking(LED_BLINK_FAST);
+
+ /* USER CODE END 2 */
+
+ /* Infinite loop */
+ /* USER CODE BEGIN WHILE */
+ while (1)
+ {
+ /* USER CODE END WHILE */
+
+ /* USER CODE BEGIN 3 */
+ }
+ /* USER CODE END 3 */
+}
+
+/**
+ * @brief System Clock Configuration
+ * @retval None
+ */
+void SystemClock_Config(void)
+{
+ LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
+
+ /* MSI configuration and activation */
+ LL_RCC_MSI_Enable();
+ while(LL_RCC_MSI_IsReady() != 1)
+ {
+ };
+
+ /* Main PLL configuration and activation */
+ LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 32, LL_RCC_PLLR_DIV_2);
+ LL_RCC_PLL_Enable();
+ LL_RCC_PLL_EnableDomain_SYS();
+ while(LL_RCC_PLL_IsReady() != 1)
+ {
+ };
+
+ /* Sysclk activation on the main PLL */
+ /* Set CPU1 prescaler*/
+ LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
+
+ /* Set CPU2 prescaler*/
+ LL_C2_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_2);
+
+ LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
+ while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
+ {
+ };
+
+ /* Set AHB SHARED prescaler*/
+ LL_RCC_SetAHB4Prescaler(LL_RCC_SYSCLK_DIV_1);
+
+ /* Set APB1 prescaler*/
+ LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
+
+ /* Set APB2 prescaler*/
+ LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
+
+ LL_Init1msTick(64000000);
+
+ /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
+ LL_SetSystemCoreClock(64000000);
+ /* USER CODE BEGIN Smps */
+
+ /* USER CODE END Smps */
+}
+
+/**
+ * @brief GPIO Initialization Function
+ * @param None
+ * @retval None
+ */
+static void MX_GPIO_Init(void)
+{
+ LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
+
+ /* GPIO Ports Clock Enable */
+ LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
+
+ /**/
+ LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);
+
+ /**/
+ GPIO_InitStruct.Pin = LED2_Pin;
+ GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
+ GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
+ GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
+ GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
+ LL_GPIO_Init(LED2_GPIO_Port, &GPIO_InitStruct);
+
+}
+
+/* USER CODE BEGIN 4 */
+/**
+ * @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
+ * @param Period : Period of time (in ms) between each toggling of LED
+ * This parameter can be user defined values. Pre-defined values used in that example are :
+ * @arg LED_BLINK_FAST : Fast Blinking
+ * @arg LED_BLINK_SLOW : Slow Blinking
+ * @arg LED_BLINK_ERROR : Error specific Blinking
+ * @retval None
+ */
+void LED_Blinking(uint32_t Period)
+{
+ /* Toggle IO in an infinite loop */
+ while (1)
+ {
+ LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
+ LL_mDelay(Period);
+ }
+}
+
+/**
+ * @brief Configures User push-button (SW1) in GPIO or EXTI Line Mode.
+ * @param ButtonMode: Specifies Button mode.
+ * This parameter can be one of following parameters:
+ * @arg BUTTON_MODE_GPIO: Button will be used as simple IO
+ * @arg BUTTON_MODE_EXTI: Button will be connected to EXTI line with interrupt
+ * generation capability
+ * @retval None
+ */
+void UserButton_Init(uint32_t Button_Mode)
+{
+ /* Enable the BUTTON Clock */
+ USER_BUTTON_GPIO_CLK_ENABLE();
+
+ /* Configure GPIO for BUTTON */
+ LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
+ LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_UP);
+
+ if(Button_Mode == BUTTON_MODE_EXTI)
+ {
+ /* Connect External Line to the GPIO */
+ USER_BUTTON_SYSCFG_SET_EXTI();
+
+ /* Enable a falling trigger EXTI line 13 Interrupt */
+ USER_BUTTON_EXTI_LINE_ENABLE();
+ USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
+
+ /* Configure NVIC for USER_BUTTON_EXTI_IRQn */
+ NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
+ NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
+ }
+}
+
+/**
+ * @brief Returns the selected Button state.
+ * @param None
+ * @retval The Button GPIO pin value.
+ */
+uint32_t UserButton_GetState(void)
+{
+ return LL_GPIO_IsInputPinSet(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN);
+}
+
+/**
+ * @brief Function to configure and initialize PWR IP.
+ * @param None
+ * @retval None
+ */
+void Configure_PWR(void)
+{
+ /* Check if the system was resumed from Standby mode */
+ /* Note: On STM32WB, both CPU1 and CPU2 must be in Standby mode to set the entire system in Standby mode */
+ if( (LL_PWR_IsActiveFlag_C1SB() != 0)
+ && (LL_PWR_IsActiveFlag_C2SB() != 0)
+ )
+ {
+ /* Clear Standby flag */
+ LL_PWR_ClearFlag_C1STOP_C1STB();
+ LL_PWR_ClearFlag_C2STOP_C2STB();
+
+ /* Change LED speed to SLOW to indicate exit from Standby mode */
+ LED_Blinking(LED_BLINK_SLOW);
+
+ /* Wait that user release the User push-button (SW1) */
+ while(UserButton_GetState() == 0){}
+ }
+
+ /* Specific procedure on STM32WB, in case of initial power-up and RF stack no started */
+ /* Note: This procedure is required when user application wants to request */
+ /* a low-power mode in the particular case: */
+ /* - RF stack not started: On STM32WB, system low-power mode is fixed */
+ /* by the deepest low-power modes of each sub-system (CPU1, */
+ /* CPU2, RF). */
+ /* Standard case is RF stack started and managing low-power modes */
+ /* of CPU2 and RF. */
+ /* In case of RF stack not started, CPU2 low-power mode must be */
+ /* forced to the lowest level. This allows to require all system */
+ /* low-power modes using only PWR for CPU1. */
+ /* low-power mode. */
+ /* - Initial power-up: In case of power-on reset, CPU2 low-power mode */
+ /* has its reset value and must be set. */
+ /* In case of system is resumed from low-power mode standby */
+ /* or shutdown, configuration of PWR parameters related to CPU2 are */
+ /* retained and must not modified (This check is required in case */
+ /* of RF stack started afterwards and to not overwritte its */
+ /* low-power configuration). */
+ if( (LL_PWR_IsActiveFlag_C1SB() == 0)
+ || (LL_PWR_IsActiveFlag_C2SB() == 0)
+ )
+ {
+ /* Set the lowest low-power mode for CPU2: shutdown mode */
+ LL_C2_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
+ }
+
+ /* Check and Clear the Wakeup flag */
+ if (LL_PWR_IsActiveFlag_WU1() != 0)
+ {
+ LL_PWR_ClearFlag_WU1();
+ }
+}
+
+/**
+ * @brief Function to configure and enter in Standby Mode.
+ * @param None
+ * @retval None
+ */
+void EnterStandbyMode(void)
+{
+ /* Wait that user release the User push-button (SW1) */
+ while(UserButton_GetState() == 0){}
+
+ /* Turn-off LED */
+ /* Note: LED state at this step depends on blinking state at the instant of user button is pressed. */
+ LL_GPIO_ResetOutputPin(GPIOB, LL_GPIO_PIN_0);
+
+ /* Disable all used wakeup sources */
+ LL_PWR_DisableWakeUpPin(LL_PWR_WAKEUP_PIN1);
+
+ /* Clear all wake up Flag */
+ LL_PWR_ClearFlag_WU();
+
+ /* Enable pull up on wakeup pin */
+ /* Note: Setting not mandatory but recommended since there is no external pulling resistor on pin PA0 on STM32WB Nucleo board */
+ LL_PWR_EnableGPIOPullUp(LL_PWR_GPIO_A, LL_PWR_GPIO_BIT_0);
+
+ /* Enable pull-up and pull-down configuration for CPU1 */
+ LL_PWR_EnablePUPDCfg();
+
+ /* Set wakeup pin polarity */
+ LL_PWR_SetWakeUpPinPolarityLow(LL_PWR_WAKEUP_PIN1);
+
+ /* Enable wakeup pin */
+ LL_PWR_EnableWakeUpPin(LL_PWR_WAKEUP_PIN1);
+
+ /* As default User push-button (SW1) state is high level, need to clear all wake up Flag again */
+ LL_PWR_ClearFlag_WU();
+
+ /** Request to enter Standby mode
+ * Following procedure describe in STM32WBxx Reference Manual
+ * See PWR part, section Low-power modes, Standby mode
+ */
+ /* Set Standby mode when CPU enters deepsleep */
+ LL_PWR_SetPowerMode(LL_PWR_MODE_STANDBY);
+
+ /* Set SLEEPDEEP bit of Cortex System Control Register */
+ LL_LPM_EnableDeepSleep();
+
+ /* This option is used to ensure that store operations are completed */
+#if defined ( __CC_ARM)
+ __force_stores();
+#endif
+ /* Request Wait For Interrupt */
+ __WFI();
+}
+
+
+
+/******************************************************************************/
+/* USER IRQ HANDLER TREATMENT */
+/******************************************************************************/
+/**
+ * @brief Function to manage BUTTON IRQ Handler
+ * @param None
+ * @retval None
+ */
+void UserButton_Callback(void)
+{
+ /* Configure and enter in Standby Mode */
+ EnterStandbyMode();
+
+ /* Here Device is in Standby mode */
+}
+
+/* USER CODE END 4 */
+
+/**
+ * @brief This function is executed in case of error occurrence.
+ * @retval None
+ */
+void Error_Handler(void)
+{
+ /* USER CODE BEGIN Error_Handler_Debug */
+ /* User can add his own implementation to report the HAL error return state */
+
+ /* USER CODE END Error_Handler_Debug */
+}
+
+#ifdef USE_FULL_ASSERT
+/**
+ * @brief Reports the name of the source file and the source line number
+ * where the assert_param error has occurred.
+ * @param file: pointer to the source file name
+ * @param line: assert_param error line source number
+ * @retval None
+ */
+void assert_failed(uint8_t *file, uint32_t line)
+{
+ /* USER CODE BEGIN 6 */
+ /* User can add his own implementation to report the file name and line number,
+ ex: printf("Wrong parameters value: file %s on line %d", file, line) */
+
+ /* Infinite loop */
+ while (1)
+ {
+ }
+
+ /* USER CODE END 6 */
+}
+#endif /* USE_FULL_ASSERT */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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