/* 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 STM32WLxx PWR LL API.
******************************************************************************
* @attention
*
* Copyright (c) 2020 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* 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. */
/* System interrupt init*/
NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* Initialize User push-button (B1) 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 (B1) 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_0);
while(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_0)
{
}
LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE2);
LL_RCC_HSI_Enable();
/* Wait till HSI is ready */
while(LL_RCC_HSI_IsReady() != 1)
{
}
LL_RCC_HSI_SetCalibTrimming(64);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);
/* Wait till System clock is ready */
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI)
{
}
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetAHB3Prescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
LL_Init1msTick(16000000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
LL_SetSystemCoreClock(16000000);
}
/**
* @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 (B1) 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 */
if(LL_PWR_IsActiveFlag_C1SB() != 0)
{
/* Clear Standby flag */
LL_PWR_ClearFlag_C1STOP_C1STB();
/* Change LED speed to SLOW to indicate exit from Standby mode */
LED_Blinking(LED_BLINK_SLOW);
/* Wait that user release the User push-button (B1) */
while(UserButton_GetState() == 0){}
}
/* 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 (B1) */
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_9);
/* 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 STM32WL 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();
/* Enable wakeup pin */
LL_PWR_EnableWakeUpPin(LL_PWR_WAKEUP_PIN1);
/* As default User push-button (B1) 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 STM32WLxx 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)
{
/* Turn LED off */
LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);
/* 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 */