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STM32CubeWL/Projects/NUCLEO-WL55JC/Examples/PWR/PWR_LPSLEEP/Src/main.c

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/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file PWR/PWR_LPSLEEP/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use STM32WLxx PWR HAL API to enter
* and exit the Low Power Sleep mode.
******************************************************************************
* @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 LED_TOGGLE_DELAY 100
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
static uint32_t TimingDelay;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Decrease(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. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
/* USER CODE BEGIN 2 */
/* Configure LED2 and LED3 */
BSP_LED_Init(LED2);
BSP_LED_Init(LED3);
/* User push-button (B1) (line 0) will be used to wakeup the system from STOP mode */
BSP_PB_Init(BUTTON_SW1, BUTTON_MODE_EXTI);
/* Enable Flash power down mode during Sleep mode */
/* (uncomment this line if power consumption figures */
/* must be measured with Flash still on in Low Power */
/* Sleep mode) */
HAL_PWREx_EnableFlashPowerDown(PWR_FLASHPD_LPSLEEP);
/* Reset all RCC Sleep and Stop modes register to */
/* improve power consumption */
RCC->AHB1SMENR = 0x0;
RCC->AHB2SMENR = 0x0;
RCC->AHB3SMENR = 0x0;
RCC->APB1SMENR1 = 0x0;
RCC->APB1SMENR2 = 0x0;
RCC->APB2SMENR = 0x0;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
/* Insert 5 seconds delay */
HAL_Delay(5000);
/* Reduce the System clock to below 2 MHz */
SystemClock_Decrease();
/* Suspend Tick increment to prevent wakeup by Systick interrupt. */
/* Otherwise the Systick interrupt will wake up the device within 1ms */
/* (HAL time base). */
HAL_SuspendTick();
/* De-init LED2 */
BSP_LED_DeInit(LED2);
/* Enter Sleep Mode, wake up is done once User push-button (B1) is pressed */
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
/* ... Low-power SLEEP mode ... */
/* System is Low Power Run mode when exiting Low Power Sleep mode,
disable low power run mode and reset the clock to initialization configuration */
HAL_PWREx_DisableLowPowerRunMode();
/* Configure the system clock for the RUN mode */
SystemClock_Config();
/* Re-init LED2 to toggle during Run mode */
BSP_LED_Init(LED2);
/* Resume Tick interrupt if disabled prior to Low Power Sleep mode entry */
HAL_ResumeTick();
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_8;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV4;
RCC_OscInitStruct.PLL.PLLN = 24;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Configure the SYSCLKSource, HCLK, PCLK1 and PCLK2 clocks dividers
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK3|RCC_CLOCKTYPE_HCLK
|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.AHBCLK3Divider = RCC_SYSCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/**
* @brief System Clock Speed decrease
* The system Clock source is shifted from PLL to MSI
* while at the same time, MSI range is set to RCC_MSIRANGE_1
* to go down to 200 KHz
* @param None
* @retval None
*/
void SystemClock_Decrease(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_MSI);
/* Disable PLL to reduce power consumption since MSI is used from that point */
/* Change MSI frequency */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_1;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Select MSI as system clock source */
/* Note: Keep AHB and APB prescaler settings from previous structure initialization */
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
}
/**
* @brief SYSTICK callback
* @param None
* @retval None
*/
void HAL_SYSTICK_Callback(void)
{
if (TimingDelay != 0)
{
TimingDelay--;
}
else
{
/* Toggle LED2 */
BSP_LED_Toggle(LED2);
TimingDelay = LED_TOGGLE_DELAY;
}
}
/* 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 */
/* Suspend tick */
HAL_SuspendTick();
/* Turn LED3 on */
BSP_LED_On(LED3);
while(1)
{
}
/* 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\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
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