STM32 MBED停止模式 - 唤醒后定时器不工作

Question

我在STM32F437 MCU（我自己的目标）上使用MBED并尝试正确进入STOP模式。该MCU没有LPTIM（低功耗定时器），所以我试图配置RTC（或WKUP引脚PA0）在STOP后几秒钟唤醒MCU。到现在为止还挺好。但醒来后有问题。 MCU正在运行，串行printf正在运行，但MBED Ticker和Timer没有按预期运行。这是交易 - Ticker没有调用附加中断，并且在唤醒后Timer可能会溢出。

// mcu start

Timer t;
t.start();

Thread::wait(10000); // sleep is enabled 10 seconds after MCU is powered ON

-> t = 10002

// wakeup timer for 10 seconds configured
// stop mode enabled

// this happens after wakeup

-> t = 4294783
-> t = 4295784
-> t = 4296785
-> t = 4297786
-> t = 4298787

唤醒我正在使用这个库 https://os.mbed.com/users/Sissors/code/WakeUp/

在Stop例程中，有像

这样的代码

 /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin : PA0 */
  GPIO_InitStruct.Pin = GPIO_PIN_0;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* Allow access to Backup */
  HAL_PWR_EnableBkUpAccess();

  /* Disable all used wakeup sources: Pin1(PA.0) */
  HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);

  /* Clear all related wakeup flags */
  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);

  /* Re-enable all used wakeup sources: Pin1(PA.0) */
  HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);

  /* FLASH Deep Power Down Mode enabled */
  HAL_PWREx_EnableFlashPowerDown();

  /* Enter Stop Mode */
  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

  /* Configures system clock after wake-up from STOP: enable HSE, PLL and select
  PLL as system clock source (HSE and PLL are disabled in STOP mode) */
  SetSysClock();

这就是我的时钟init（SetSysClock）的样子。它在MCU启动和MCU唤醒后调用。

/******************************************************************************/
/*            PLL (clocked by HSE) used as System clock source                */
/******************************************************************************/

uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
{

    RCC_OscInitTypeDef RCC_OscInitStruct;
    RCC_ClkInitTypeDef RCC_ClkInitStruct;

    /* 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_RCC_PWR_CLK_ENABLE();
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);

    // Enable HSE oscillator and activate PLL with HSE as source
    RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSE;
    if (bypass == 0) {
        RCC_OscInitStruct.HSEState          = RCC_HSE_ON; // External 8 MHz xtal on OSC_IN/OSC_OUT
    } else {
        RCC_OscInitStruct.HSEState          = RCC_HSE_BYPASS; // External 8 MHz clock on OSC_IN
    }

    RCC_OscInitStruct.HSIState            = RCC_HSI_OFF;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 25;
#if (CLOCK_SOURCE_USB)
    RCC_OscInitStruct.PLL.PLLN = 336;
#else
    RCC_OscInitStruct.PLL.PLLN = 336;
#endif
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; // 180 MHz or 168 MHz if CLOCK_SOURCE_USB defined
    RCC_OscInitStruct.PLL.PLLQ = 7;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
        return 0; // FAIL
    }

    // Activate the OverDrive to reach the 180 MHz Frequency
    if (HAL_PWREx_EnableOverDrive() != HAL_OK) {
        return 0; // FAIL
    }

    // Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 180 or 168 MHz
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;  //  45 or  42 MHz
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;  //  90 or  84 MHz
    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) {
        return 0; // FAIL
    }

    // HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_3);

    return 1;
}
#endif