STM32应用：简介STM32L4 SMPS功能

2021-11-16 11:51

STM32L4系列为一低功耗，高效能的MCU，其具备有ARM Cortex-M4核心，在电源部分，除了传统内建LDO外，STMicroelectronics在以此为基础上另外提供了可外挂SMPS的型号，在Run mode可以更进一步的改善功耗表现。大大购相关商品以STM32L452RET6﹝一般版本﹞和STM32L452RET6 红圈标示起来的部分，STM32L452RET6

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SYSCLK低于26MHz时，V
SYSCLK高于26MHz时，V
在power up或是非同步reset之类的情况下，V
从SMPS连接到断开的期间，SYSCLK必须要低于26MHz
SMPS只能在Run mode、Sleep mode和Stop 0 mode下，且VDD12的电压大于内建main LDO 50mV时才能连接，在其他的电源模式下，SMPS必须被断开，避免损坏内建的LDO。
**附件提供了三个测试程式，分别在Run mode、STOP 0 mode

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例程如下：1

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例程如下：2

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例程如下：3

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int main(void)
{

  GPIO_InitTypeDef  GPIO_InitStruct;

  /* STM32L4xx HAL library initialization:
   - Configure the Flash prefetch
   - Systick timer is configured by default as source of time base, but user
      can eventually implement his proper time base source (a general purpose
      timer for example or other time source), keeping in mind that Time base
      duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
      handled in milliseconds basis.
   - Set NVIC Group Priority to 4
   - Low Level Initialization
   */
  HAL_Init();

  /* Configure LED4 */
  BSP_LED_Init(LED4);

  /* Configure the system clock to 80 MHz */
  SystemClock_80MHz();



  /* User push-button (External line 13) will be used to enable or not the SMPS mode */
  BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);

  /* ------------------------------------------ */

/* Insert 5 seconds delay */
   HAL_Delay(5000);

  /********************************/
  /* 80 MHZ                      */
  /* PWR_REGULATOR_VOLTAGE_SCALE1 */
  /* SMPS IS OFF                */
  /********************************/

  /* ------------------ GPIO ------------------ */
  BSP_LED_Off(LED4);

  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Pin = GPIO_PIN_All;

  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

  HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);

  __HAL_RCC_GPIOA_CLK_DISABLE();
  __HAL_RCC_GPIOB_CLK_DISABLE();
  __HAL_RCC_GPIOC_CLK_DISABLE();
  __HAL_RCC_GPIOD_CLK_DISABLE();
  __HAL_RCC_GPIOE_CLK_DISABLE();

  __HAL_RCC_GPIOH_CLK_DISABLE();

  if (button_pressed == 1)
  {
test_run_range2_80mhz_SMPS();
  }
  else
  {

  }

  whileloop1();
}

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/**
  * @brief  Move to Run SMPS mode
  * @NOTE Manage all the required transitions to move from 80 MHz, SMPS off,
         voltage scale range 1 to 80 MHz, SMPS on, voltage scale range 2.
  * @param  None
  * @retval None
  */
static void test_run_range2_80mhz_SMPS(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  uint32_t SMPS_status_local = 0;

  SMPS_status_local = BSP_SMPS_DeInit();
  if (SMPS_status_local != SMPS_OK)
{
Error_Handler();
}
  SMPS_status_local = BSP_SMPS_Init(PWR_REGULATOR_VOLTAGE_SCALE2);
  if (SMPS_status_local != SMPS_OK)
  {
Error_Handler();
  }

  /* ------------------------------------------ */


  __HAL_FLASH_PREFETCH_BUFFER_DISABLE();
  /* Set the System clock to 24 MHz */
  /* so that SMPS can be enabled */
  SystemClock_24MHz();

  /* Insert 1 second delay */
  HAL_Delay(1000);

  /********************************/
  /* 24 MHZ                      */
  /* PWR_REGULATOR_VOLTAGE_SCALE1 */
  /* SMPS IS OFF                */
  /********************************/

  /* ------------------------------------------ */

  /* PWR_REGULATOR_VOLTAGE_SCALE2 only with AD SMPS */
  HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE2);
  if (SMPS_status_local != SMPS_OK)
{
Error_Handler();
}

  /* Insert 1 second delay */
  HAL_Delay(1000);

  /********************************/
  /* 24 MHZ                      */
  /* PWR_REGULATOR_VOLTAGE_SCALE2 */
  /* SMPS IS OFF                */
  /********************************/

  /* ------------------------------------------ */

  /* Enable SMPS */

  /* Check of PG but not blocking */
  SMPS_status_local = BSP_SMPS_Enable (0 , 1);

  /* Check of PG */
  SMPS_status_local = BSP_SMPS_Supply_Enable (4 , 1);

  if (SMPS_status_local != SMPS_OK)
  {
Error_Handler();
  }

  /* Insert 2 seconds delay */
  HAL_Delay(2000);

  /********************************/
  /* 24 MHZ                      */
  /* PWR_REGULATOR_VOLTAGE_SCALE2 */
  /* SMPS IS ON                */
  /********************************/

  /* ------------------------------------------ */

  /* Set System clock to 80 MHz (MSI) */
  SystemClock_80MHz();

  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Pull = GPIO_NOPULL;

  GPIO_InitStruct.Pin = GPIO_PIN_All;
  GPIO_InitStruct.Pin ^= (PIN_SMPS_ENABLE | PIN_SMPS_SWITCH_ENABLE | PIN_SMPS_POWERGOOD);

  HAL_GPIO_Init(PORT_SMPS, &GPIO_InitStruct);

  NUCLEO_SMPS_GPIO_CLK_DISABLE();

}