【NUCLEO-STM32U385RG开发板测评】04 低功耗测试

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星海灿烂发布时间：2025-7-4 13:46

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文章简介:	主要对U385进行了低功耗测试

本次来测试一下STM32U385几种低功耗模式.

一、STM32U385RG有几种低功耗模式

1、睡眠模式（Sleep Mode）

1）特性：CPU 时钟关闭，所有外设包括 Cortex-M33 内核，如 NVIC 和 SysTick可以在中断或事件发生时运行并唤醒 CPU

2）进入条件：CPU时钟关闭，但外设（如NVIC、SysTick）仍运行。

3）唤醒方式：任意中断或事件触发唤醒（如GPIO中断、定时器中断）。

2、停止模式（Stop Modes）

分为四级子模式（Stop 0/1/2/3）

1）特性

所有时钟关闭，除了LSE和LSI

2）唤醒源：外部中断（EXTI）、RTC闹钟、低功耗定时器

3、待机模式（Standby Mode）

1）特性：

关闭核心域电源，仅备份域和可选SRAM2保留（可配置保留8/24/32KB）。

支持BOR（欠压复位）超低功耗配置。

2）唤醒方式：NRST引脚复位、RTC事件、WKUP引脚边沿触发、IWDG复位等。唤醒后时钟：MSI（≤12MHz）。

4、关机模式（Shutdown Mode）

1）特性：

功耗最低，关闭所有稳压器和振荡器（包括HSI/MSI/LSI）。无BOR电压监控，不支持备份域切换。

2）唤醒方式：NRST复位、WKUP引脚事件、RTC事件。唤醒后时钟：MSI（12MHz）。

5、官方手册各个模式对比

包含了进入和唤醒源以及时钟

二、编写低功耗测试代码

1、测试条件

1）VDD 3.3V

2）时钟使用MSI，并且时钟频率为3MHz

2、新建工程

这块步骤就不写了，主要进行时钟配置以及开启ICACE

3）编写代码

功耗代码如下

/* 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 "gpio.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 LP_SLEEP_MODE 0
#define LP_STOP0_MODE 0
#define LP_STOP1_MODE 0
#define LP_STOP2_MODE 0
#define LP_STOP3_MODE 0
#define LP_STANDBY_MODE 0
#define LP_SHUTDOWN_MODE 0
#define LP_POWER_TEST 0
/* 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);
/* 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 */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */
  /* Enable the SMPS regulator to improve power efficiency */
  if(HAL_PWREx_ConfigSupply(PWR_SMPS_SUPPLY) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ICACHE_Init();
  /* USER CODE BEGIN 2 */
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
  HAL_Delay(1000);
  HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
  /* Insert 5 seconds delay */
  //HAL_Delay(5000);
  /* Suspend Tick increment to prevent wakeup by Systick interrupt.         */
  /* Otherwise the Systick interrupt will wake up the device within 1ms     */
  /* (HAL time base).                                                       */
#if LP_POWER_TEST
  HAL_SuspendTick();
#endif
#if LP_SLEEP_MODE

  /* Disable Prefetch Buffer */
  __HAL_FLASH_PREFETCH_BUFFER_DISABLE();
  /* Enter Sleep Mode , wake up is done once User push-button is pressed */
  HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
#elif LP_STOP0_MODE
          HAL_PWR_EnterSTOPMode(PWR_LOWPOWERMODE_STOP0, PWR_STOPENTRY_WFI);
#elif LP_STOP1_MODE
          HAL_PWR_EnterSTOPMode(PWR_LOWPOWERMODE_STOP1, PWR_STOPENTRY_WFI);
#elif LP_STOP2_MODE
          HAL_PWR_EnterSTOPMode(PWR_LOWPOWERMODE_STOP2, PWR_STOPENTRY_WFI);
#elif LP_STOP3_MODE
          HAL_PWR_EnterSTOPMode(PWR_LOWPOWERMODE_STOP3, PWR_STOPENTRY_WFI);
#elif LP_STANDBY_MODE
          /* Enter the Standby mode */
          HAL_PWR_EnterSTANDBYMode();
#elif LP_SHUTDOWN_MODE
        /* Enter shutdown mode */
        HAL_PWREx_EnterSHUTDOWNMode();
#endif
  /* 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)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE2) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSIS;
  RCC_OscInitStruct.MSISState = RCC_MSI_ON;
  RCC_OscInitStruct.MSISSource = RCC_MSI_RC1;
  RCC_OscInitStruct.MSISDiv = RCC_MSI_DIV8;
  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_MSIS;
  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();
  }
}

/* USER CODE BEGIN 4 */

/* 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)
  {
  }
  /* 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 */

三、下载测试各个模式下的功耗

1、运行模式

257.36uA

微信图片_20250704134028.jpg