static HAL_StatusTypeDef RCC_SetFlashLatencyFromMSIRange()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc.c [1771:1856]

• 68 lines of code
• 18 McCabe index (conditional complexity)

static HAL_StatusTypeDef RCC_SetFlashLatencyFromMSIRange(uint32_t msirange)
{
  uint32_t vos;
  uint32_t latency = FLASH_LATENCY_0;  /* default value 0WS */

  if(__HAL_RCC_PWR_IS_CLK_ENABLED())
  {
    vos = HAL_PWREx_GetVoltageRange();
  }
  else
  {
    __HAL_RCC_PWR_CLK_ENABLE();
    vos = HAL_PWREx_GetVoltageRange();
    __HAL_RCC_PWR_CLK_DISABLE();
  }

  if(vos == PWR_REGULATOR_VOLTAGE_SCALE1)
  {
    if(msirange > RCC_MSIRANGE_8)
    {
      /* MSI > 16Mhz */
      if(msirange > RCC_MSIRANGE_10)
      {
        /* MSI 48Mhz */
        latency = FLASH_LATENCY_2; /* 2WS */
      }
      else
      {
        /* MSI 24Mhz or 32Mhz */
        latency = FLASH_LATENCY_1; /* 1WS */
      }
    }
    /* else MSI <= 16Mhz default FLASH_LATENCY_0 0WS */
  }
  else
  {
#if defined(STM32L4P5xx) || defined(STM32L4Q5xx) || \
    defined(STM32L4R5xx) || defined(STM32L4R7xx) || defined(STM32L4R9xx) || defined(STM32L4S5xx) || defined(STM32L4S7xx) || defined(STM32L4S9xx)
    if(msirange >= RCC_MSIRANGE_8)
    {
      /* MSI >= 16Mhz */
      latency = FLASH_LATENCY_2; /* 2WS */
    }
    else
    {
      if(msirange == RCC_MSIRANGE_7)
      {
        /* MSI 8Mhz */
        latency = FLASH_LATENCY_1; /* 1WS */
      }
      /* else MSI < 8Mhz default FLASH_LATENCY_0 0WS */
    }
#else
    if(msirange > RCC_MSIRANGE_8)
    {
      /* MSI > 16Mhz */
      latency = FLASH_LATENCY_3; /* 3WS */
    }
    else
    {
      if(msirange == RCC_MSIRANGE_8)
      {
        /* MSI 16Mhz */
        latency = FLASH_LATENCY_2; /* 2WS */
      }
      else if(msirange == RCC_MSIRANGE_7)
      {
        /* MSI 8Mhz */
        latency = FLASH_LATENCY_1; /* 1WS */
      }
      /* else MSI < 8Mhz default FLASH_LATENCY_0 0WS */
    }
#endif
  }

  __HAL_FLASH_SET_LATENCY(latency);

  /* Check that the new number of wait states is taken into account to access the Flash
     memory by reading the FLASH_ACR register */
  if(__HAL_FLASH_GET_LATENCY() != latency)
  {
    return HAL_ERROR;
  }

  return HAL_OK;
}