STM32L152的低功耗测试

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aimejia 发布时间：2018-5-23 11:15

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本帖最后由 aimejia 于 2018-5-23 11:18 编辑

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：
[cpp] 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：

[cpp] 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();
}
}