- last edited on by
Lina_DABASINSKA
I am using an stm32U545RE_Q and want to put my device into standby mode and then periodically wake it up (every 10s). but it doesn't work
Am I missing something or how am I supposed to continue from here?
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2025 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"
#include "icache.h"
#include "memorymap.h"
#include "rtc.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <string.h>
#include <stdio.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* 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 SystemPower_Config(void);
/* USER CODE BEGIN PFP */
/* 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 */
__HAL_RCC_PWR_CLK_ENABLE();
HAL_PWR_EnableBkUpAccess();
__HAL_RCC_RTC_ENABLE();
__HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
/* USER CODE END Init */
/* Configure the System Power */
SystemPower_Config();
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
MX_RTC_Init();
MX_ICACHE_Init();
/* USER CODE BEGIN 2 */
uint8_t buffer[256];
uint8_t count=0;
if(__HAL_PWR_GET_FLAG(PWR_FLAG_SBF) !=RESET)
{
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_SBF);
char *str ="Wake up form the STANDBY MODE\r\n\n";
HAL_UART_Transmit(&huart1, (uint8_t*)str, strlen(str), 10);
for(int i=0; i<20; i++)
{
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
HAL_Delay(200);
}
//HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN2);
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
}
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc,RTC_FLAG_WUTF);
char *str ="Enter the STANDBY MODE\r\n\n";
HAL_UART_Transmit(&huart1, (uint8_t*)str, strlen(str), 10);
for(int i=0; i<5; i++)
{
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
HAL_Delay(1000);
}
//HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2_HIGH_1);
/*if (HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 10000, RTC_WAKEUPCLOCK_RTCCLK_DIV16, 0) != HAL_OK)
{
Error_Handler();
}*/
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{sprintf((char *)buffer, "Loop! %d\r\n", ++count);
HAL_UART_Transmit(&huart1, buffer, strlen((char *)buffer), 100);
HAL_Delay(1000);
if (count==5)
{ char *str2 ="STANDBY MODE is ON\r\n\n";
HAL_UART_Transmit(&huart1, (uint8_t*)str2, strlen(str2), 10);
HAL_SuspendTick();
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0x2805, RTC_WAKEUPCLOCK_RTCCLK_DIV16, 0);
__HAL_RCC_PWR_CLK_ENABLE ();
HAL_PWR_EnterSTANDBYMode();
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* 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
*/
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE4) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_4;
RCC_OscInitStruct.LSIDiv = RCC_LSI_DIV1;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_PCLK3;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief Power Configuration
* @retval None
*/
static void SystemPower_Config(void)
{
/*
* Switch to SMPS regulator instead of LDO
*/
if (HAL_PWREx_ConfigSupply(PWR_SMPS_SUPPLY) != HAL_OK)
{
Error_Handler();
}
/* PWR_S3WU_IRQn interrupt configuration */
HAL_NVIC_SetPriority(PWR_S3WU_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(PWR_S3WU_IRQn);
/* USER CODE BEGIN PWR */
/* USER CODE END PWR */
}
/* USER CODE BEGIN 4 */
void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc) {
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(hrtc, RTC_FLAG_WUTF);
}
/* 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 */
__disable_irq();
while (1)
{
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_7);
}
/* 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) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
----> This is my code
Hello @dlagyals;
Please use </> button to share your code. See this post.
For the RTC issue, First of all I recommend you to look at this FAQ and check how to calculate WakeUpCounter.
Second, I advise you to get inspired from an available example to check your code like as RTC_LowPower_STANDBY_WUT.
This example describes how to periodically enter and wake up from STANDBY mode thanks to the RTC Wake-Up Timer (WUT).
Thank you.
Kaouthar
