STM32L152的低功耗测试
本文将验证STM32L32在stop模式下的低功耗电流。在ST官网的STM32L152RE芯片介绍上明确有说明此芯片在stop模式下可以达到560nA，纳安！并且还可以支持16个外部中断唤醒。真的这么强！下面来验证一下。采用nucleo-L152板子进行验证，使用CubeMx生成工程代码。在CubeMx中选择STM32L152RE这款芯片，pinout如下设置：如上图，只是简单地将PC13,PB9,PB5,PB4,PD2,PA12,PB15,PB1设置为外部中断。为了得到最低功耗，时钟树采用芯片内部时钟HSI：
在configuration下，将GPIO都设置为下拉，PC13在NUCLEO板子上是按键，设为上拉。生成代码。main函数稍作修改： view plain copy
[*]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();
[*]
[*]/* Configure the system clock */
[*]SystemClock_Config();
[*]
[*]/* Initialize all configured peripherals */
[*]MX_GPIO_Init();
[*]
[*]/* USER CODE BEGIN 2 */
[*]HAL_PWREx_EnableUltraLowPower();
[*]HAL_PWREx_EnableFastWakeUp();
[*]/* USER CODE END 2 */
[*]
[*]/* Infinite loop */
[*]/* USER CODE BEGIN WHILE */
[*]while (1)
[*]{
[*]/* USER CODE END WHILE */
[*]
[*]/* USER CODE BEGIN 3 */
[*] HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
[*]
[*] /* Configures system clock after wake-up from STOP: enable HSI, PLL and select
[*] PLL as system clock source (HSI and PLL are disabLED automatically in STOP mode) */
[*] SystemClockConfig_STOP();
[*] HAL_Delay(200);
[*]}
[*]/* USER CODE END 3 */
[*]
[*]}
SystemClockConfig_STOP函数如下配置： view plain copy
[*]static void SystemClockConfig_STOP(void)
[*]{
[*]RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
[*]RCC_OscInitTypeDef RCC_OscInitStruct = {0};
[*]
[*]/* Enable Power Control clock */
[*]__HAL_RCC_PWR_CLK_ENABLE();
[*]
[*]/* The voltage scaling allows optimizing the power consumption when the device is
[*] clocked below the maximum system frequency, to update the voltage scaling value
[*] regarding system frequency refer to product datasheet.*/
[*]__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
[*]
[*]/* Poll VOSF bit of in PWR_CSR. Wait until it is reset to 0 */
[*]while (__HAL_PWR_GET_FLAG(PWR_FLAG_VOS) != RESET) {};
[*]
[*]/* Get the Oscillators configuration according to the internal RCC registers */
[*]HAL_RCC_GetOscConfig(&RCC_OscInitStruct);
[*]
[*]/* After wake-up from STOP reconfigure the system clock: Enable HSI and PLL */
[*]RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
[*]RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
[*]RCC_OscInitStruct.HSIState = RCC_HSI_ON;
[*]RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
[*]RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
[*]RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
[*]RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
[*]RCC_OscInitStruct.PLL.PLLDIV = RCC_PLL_DIV3;
[*]if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
[*]{
[*] Error_Handler();
[*]}
[*]
[*]/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
[*] clocks dividers */
[*]RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
[*]RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
[*]if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
[*]{
[*] Error_Handler();
[*]}
[*]}
编译烧录后使用电流表进行测试：0.3uA! 看来所言非虚，300nA,按下按键，发现电流变大了，如下：电流变为11mA，这个位为工作电流，这说明外部中断生效了。
STM32L152在低功耗这块，确实还不错！实测stop模式下300nA的电流，比手册上所示的560nA还低，看来ST还是比较保守。
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