text: /**
   ******************************************************************************
   * @file    system_stm32f4xx.c
   * @author  MCD Application Team
   * @version V2.6.1
   * @date    14-February-2017
   * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File.
   *
   *   This file provides two functions and one global variable to be called from 
   *   user application:
   *      - SystemInit(): This function is called at startup just after reset and 
   *                      before branch to main program. This call is made inside
   *                      the "startup_stm32f4xx.s" file.
   *
   *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
   *                                  by the user application to setup the SysTick 
   *                                  timer or configure other parameters.
   *                                     
   *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
   *                                 be called whenever the core clock is changed
   *                                 during program execution.
   *
   *
   ******************************************************************************
   * @attention
   *
   * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *   1. Redistributions of source code must retain the above copyright notice,
   *      this list of conditions and the following disclaimer.
   *   2. Redistributions in binary form must reproduce the above copyright notice,
   *      this list of conditions and the following disclaimer in the documentation
   *      and/or other materials provided with the distribution.
   *   3. Neither the name of STMicroelectronics nor the names of its contributors
   *      may be used to endorse or promote products derived from this software
   *      without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   ******************************************************************************
   */
  
  /** @addtogroup CMSIS
   * @{
   */
  
  /** @addtogroup stm32f4xx_system
   * @{
   */
  
  /** @addtogroup STM32F4xx_System_Private_Includes
   * @{
   */
  
  #include "stm32f4xx.h"
  
  #if !defined  (HSE_VALUE) 
  #define HSE_VALUE    ((uint32_t)25000000) /*!< Default value of the External oscillator in Hz */
  #endif /* HSE_VALUE */
  
  #if !defined  (HSI_VALUE)
  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
  #endif /* HSI_VALUE */
  
  /**
   * @}
   */
  
  /** @addtogroup STM32F4xx_System_Private_TypesDefinitions
   * @{
   */
  
  /**
   * @}
   */
  
  /** @addtogroup STM32F4xx_System_Private_Defines
   * @{
   */
  
  /************************* Miscellaneous Configuration ************************/
  /*!< Uncomment the following line if you need to use external SRAM or SDRAM as data memory  */
  #if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx)\
   || defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
   || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx)
  /* #define DATA_IN_ExtSRAM */
  #endif /* STM32F40xxx || STM32F41xxx || STM32F42xxx || STM32F43xxx || STM32F469xx || STM32F479xx ||\
            STM32F412Zx || STM32F412Vx */
  
  #if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
   || defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx)
  /* #define DATA_IN_ExtSDRAM */
  #endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F446xx || STM32F469xx ||\
            STM32F479xx */
  
  /*!< Uncomment the following line if you need to relocate your vector Table in
   Internal SRAM. */
  /* #define VECT_TAB_SRAM */
  #define VECT_TAB_OFFSET  0x00 /*!< Vector Table base offset field. 
                                     This value must be a multiple of 0x200. */
  /******************************************************************************/
  
  /**
   * @}
   */
  
  /** @addtogroup STM32F4xx_System_Private_Macros
   * @{
   */
  
  /**
   * @}
   */
  
  /** @addtogroup STM32F4xx_System_Private_Variables
   * @{
   */
  /* This variable is updated in three ways:
   1) by calling CMSIS function SystemCoreClockUpdate()
   2) by calling HAL API function HAL_RCC_GetHCLKFreq()
   3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 
   Note: If you use this function to configure the system clock; then there
   is no need to call the 2 first functions listed above, since SystemCoreClock
   variable is updated automatically.
   */
  uint32_t SystemCoreClock = 16000000;
  const uint8_t AHBPrescTable[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8,
      9 };
  const uint8_t APBPrescTable[8] = { 0, 0, 0, 0, 1, 2, 3, 4 };
  /**
   * @}
   */
  
  /** @addtogroup STM32F4xx_System_Private_FunctionPrototypes
   * @{
   */
  
  #if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
  static void SystemInit_ExtMemCtl(void);
  #endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
  
  /**
   * @}
   */
  
  /** @addtogroup STM32F4xx_System_Private_Functions
   * @{
   */
  
  /**
   * @brief  Setup the microcontroller system
   *         Initialize the FPU setting, vector table location and External memory 
   *         configuration.
   * @param  None
   * @retval None
   */
  void SystemInit(void) {
    /* FPU settings ------------------------------------------------------------*/
  #if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
    SCB->CPACR |= ((3UL << 10 * 2) | (3UL << 11 * 2)); /* set CP10 and CP11 Full Access */
  #endif
    /* Reset the RCC clock configuration to the default reset state ------------*/
    /* Set HSION bit */
    RCC->CR |= (uint32_t) 0x00000001;
  
    /* Reset CFGR register */
    RCC->CFGR = 0x00000000;
  
    /* Reset HSEON, CSSON and PLLON bits */
    RCC->CR &= (uint32_t) 0xFEF6FFFF;
  
    /* Reset PLLCFGR register */
    RCC->PLLCFGR = 0x24003010;
  
    /* Reset HSEBYP bit */
    RCC->CR &= (uint32_t) 0xFFFBFFFF;
  
    /* Disable all interrupts */
    RCC->CIR = 0x00000000;
  
  #if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
    SystemInit_ExtMemCtl();
  #endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
  
    /* Configure the Vector Table location add offset address ------------------*/
  #ifdef VECT_TAB_SRAM
    SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
  #else
    SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
  #endif
  }
  
  /**
   * @brief  Update SystemCoreClock variable according to Clock Register Values.
   *         The SystemCoreClock variable contains the core clock (HCLK), it can
   *         be used by the user application to setup the SysTick timer or configure
   *         other parameters.
   *           
   * @note   Each time the core clock (HCLK) changes, this function must be called
   *         to update SystemCoreClock variable value. Otherwise, any configuration
   *         based on this variable will be incorrect.         
   *     
   * @note   - The system frequency computed by this function is not the real 
   *           frequency in the chip. It is calculated based on the predefined 
   *           constant and the selected clock source:
   *             
   *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
   *                                              
   *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
   *                          
   *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) 
   *             or HSI_VALUE(*) multiplied/divided by the PLL factors.
   *         
   *         (*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.h file (default value
   *             16 MHz) but the real value may vary depending on the variations
   *             in voltage and temperature.   
   *    
   *         (**) HSE_VALUE is a constant defined in stm32f4xx_hal_conf.h file (its value
   *              depends on the application requirements), user has to ensure that HSE_VALUE
   *              is same as the real frequency of the crystal used. Otherwise, this function
   *              may have wrong result.
   *                
   *         - The result of this function could be not correct when using fractional
   *           value for HSE crystal.
   *     
   * @param  None
   * @retval None
   */
  void SystemCoreClockUpdate(void) {
    uint32_t tmp = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2;
  
    /* Get SYSCLK source -------------------------------------------------------*/
    tmp = RCC->CFGR & RCC_CFGR_SWS;
  
    switch (tmp) {
      case 0x00: /* HSI used as system clock source */
        SystemCoreClock = HSI_VALUE;
        break;
      case 0x04: /* HSE used as system clock source */
        SystemCoreClock = HSE_VALUE;
        break;
      case 0x08: /* PLL used as system clock source */
  
        /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N
         SYSCLK = PLL_VCO / PLL_P
         */
        pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22;
        pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM;
  
        if (pllsource != 0) {
          /* HSE used as PLL clock source */
          pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
        } else {
          /* HSI used as PLL clock source */
          pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
        }
  
        pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >> 16) + 1) * 2;
        SystemCoreClock = pllvco / pllp;
        break;
      default:
        SystemCoreClock = HSI_VALUE;
        break;
    }
    /* Compute HCLK frequency --------------------------------------------------*/
    /* Get HCLK prescaler */
    tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
    /* HCLK frequency */
    SystemCoreClock >>= tmp;
  }
  
  #if defined (DATA_IN_ExtSRAM) && defined (DATA_IN_ExtSDRAM)
  #if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
   || defined(STM32F469xx) || defined(STM32F479xx)
  /**
   * @brief  Setup the external memory controller.
   *         Called in startup_stm32f4xx.s before jump to main.
   *         This function configures the external memories (SRAM/SDRAM)
   *         This SRAM/SDRAM will be used as program data memory (including heap and stack).
   * @param  None
   * @retval None
   */
  void SystemInit_ExtMemCtl(void)
  {
    __IO uint32_t tmp = 0x00;
  
    register uint32_t tmpreg = 0, timeout = 0xFFFF;
    register __IO uint32_t index;
  
    /* Enable GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH and GPIOI interface clock */
    RCC->AHB1ENR |= 0x000001F8;
  
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIOCEN);
  
    /* Connect PDx pins to FMC Alternate function */
    GPIOD->AFR[0] = 0x00CCC0CC;
    GPIOD->AFR[1] = 0xCCCCCCCC;
    /* Configure PDx pins in Alternate function mode */
    GPIOD->MODER = 0xAAAA0A8A;
    /* Configure PDx pins speed to 100 MHz */
    GPIOD->OSPEEDR = 0xFFFF0FCF;
    /* Configure PDx pins Output type to push-pull */
    GPIOD->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PDx pins */
    GPIOD->PUPDR = 0x00000000;
  
    /* Connect PEx pins to FMC Alternate function */
    GPIOE->AFR[0] = 0xC00CC0CC;
    GPIOE->AFR[1] = 0xCCCCCCCC;
    /* Configure PEx pins in Alternate function mode */
    GPIOE->MODER = 0xAAAA828A;
    /* Configure PEx pins speed to 100 MHz */
    GPIOE->OSPEEDR = 0xFFFFC3CF;
    /* Configure PEx pins Output type to push-pull */
    GPIOE->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PEx pins */
    GPIOE->PUPDR = 0x00000000;
  
    /* Connect PFx pins to FMC Alternate function */
    GPIOF->AFR[0] = 0xCCCCCCCC;
    GPIOF->AFR[1] = 0xCCCCCCCC;
    /* Configure PFx pins in Alternate function mode */
    GPIOF->MODER = 0xAA800AAA;
    /* Configure PFx pins speed to 50 MHz */
    GPIOF->OSPEEDR = 0xAA800AAA;
    /* Configure PFx pins Output type to push-pull */
    GPIOF->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PFx pins */
    GPIOF->PUPDR = 0x00000000;
  
    /* Connect PGx pins to FMC Alternate function */
    GPIOG->AFR[0] = 0xCCCCCCCC;
    GPIOG->AFR[1] = 0xCCCCCCCC;
    /* Configure PGx pins in Alternate function mode */
    GPIOG->MODER = 0xAAAAAAAA;
    /* Configure PGx pins speed to 50 MHz */
    GPIOG->OSPEEDR = 0xAAAAAAAA;
    /* Configure PGx pins Output type to push-pull */
    GPIOG->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PGx pins */
    GPIOG->PUPDR = 0x00000000;
  
    /* Connect PHx pins to FMC Alternate function */
    GPIOH->AFR[0] = 0x00C0CC00;
    GPIOH->AFR[1] = 0xCCCCCCCC;
    /* Configure PHx pins in Alternate function mode */
    GPIOH->MODER = 0xAAAA08A0;
    /* Configure PHx pins speed to 50 MHz */
    GPIOH->OSPEEDR = 0xAAAA08A0;
    /* Configure PHx pins Output type to push-pull */
    GPIOH->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PHx pins */
    GPIOH->PUPDR = 0x00000000;
  
    /* Connect PIx pins to FMC Alternate function */
    GPIOI->AFR[0] = 0xCCCCCCCC;
    GPIOI->AFR[1] = 0x00000CC0;
    /* Configure PIx pins in Alternate function mode */
    GPIOI->MODER = 0x0028AAAA;
    /* Configure PIx pins speed to 50 MHz */
    GPIOI->OSPEEDR = 0x0028AAAA;
    /* Configure PIx pins Output type to push-pull */
    GPIOI->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PIx pins */
    GPIOI->PUPDR = 0x00000000;
  
    /*-- FMC Configuration -------------------------------------------------------*/
    /* Enable the FMC interface clock */
    RCC->AHB3ENR |= 0x00000001;
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
  
    FMC_Bank5_6->SDCR[0] = 0x000019E4;
    FMC_Bank5_6->SDTR[0] = 0x01115351;
  
    /* SDRAM initialization sequence */
    /* Clock enable command */
    FMC_Bank5_6->SDCMR = 0x00000011;
    tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* Delay */
    for (index = 0; index<1000; index++);
  
    /* PALL command */
    FMC_Bank5_6->SDCMR = 0x00000012;
    timeout = 0xFFFF;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* Auto refresh command */
    FMC_Bank5_6->SDCMR = 0x00000073;
    timeout = 0xFFFF;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* MRD register program */
    FMC_Bank5_6->SDCMR = 0x00046014;
    timeout = 0xFFFF;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* Set refresh count */
    tmpreg = FMC_Bank5_6->SDRTR;
    FMC_Bank5_6->SDRTR = (tmpreg | (0x0000027C<<1));
  
    /* Disable write protection */
    tmpreg = FMC_Bank5_6->SDCR[0];
    FMC_Bank5_6->SDCR[0] = (tmpreg & 0xFFFFFDFF);
  
  #if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
    /* Configure and enable Bank1_SRAM2 */
    FMC_Bank1->BTCR[2] = 0x00001011;
    FMC_Bank1->BTCR[3] = 0x00000201;
    FMC_Bank1E->BWTR[2] = 0x0fffffff;
  #endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */ 
  #if defined(STM32F469xx) || defined(STM32F479xx)
    /* Configure and enable Bank1_SRAM2 */
    FMC_Bank1->BTCR[2] = 0x00001091;
    FMC_Bank1->BTCR[3] = 0x00110212;
    FMC_Bank1E->BWTR[2] = 0x0fffffff;
  #endif /* STM32F469xx || STM32F479xx */
  
    (void)(tmp);
  }
  #endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx */
  #elif defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
  /**
   * @brief  Setup the external memory controller.
   *         Called in startup_stm32f4xx.s before jump to main.
   *         This function configures the external memories (SRAM/SDRAM)
   *         This SRAM/SDRAM will be used as program data memory (including heap and stack).
   * @param  None
   * @retval None
   */
  void SystemInit_ExtMemCtl(void)
  {
    __IO uint32_t tmp = 0x00;
  #if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
   || defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx)
  #if defined (DATA_IN_ExtSDRAM)
    register uint32_t tmpreg = 0, timeout = 0xFFFF;
    register __IO uint32_t index;
  
  #if defined(STM32F446xx)
    /* Enable GPIOA, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG interface
     clock */
    RCC->AHB1ENR |= 0x0000007D;
  #else
    /* Enable GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH and GPIOI interface 
     clock */
    RCC->AHB1ENR |= 0x000001F8;
  #endif /* STM32F446xx */  
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIOCEN);
  
  #if defined(STM32F446xx)
    /* Connect PAx pins to FMC Alternate function */
    GPIOA->AFR[0] |= 0xC0000000;
    GPIOA->AFR[1] |= 0x00000000;
    /* Configure PDx pins in Alternate function mode */
    GPIOA->MODER |= 0x00008000;
    /* Configure PDx pins speed to 50 MHz */
    GPIOA->OSPEEDR |= 0x00008000;
    /* Configure PDx pins Output type to push-pull */
    GPIOA->OTYPER |= 0x00000000;
    /* No pull-up, pull-down for PDx pins */
    GPIOA->PUPDR |= 0x00000000;
  
    /* Connect PCx pins to FMC Alternate function */
    GPIOC->AFR[0] |= 0x00CC0000;
    GPIOC->AFR[1] |= 0x00000000;
    /* Configure PDx pins in Alternate function mode */
    GPIOC->MODER |= 0x00000A00;
    /* Configure PDx pins speed to 50 MHz */
    GPIOC->OSPEEDR |= 0x00000A00;
    /* Configure PDx pins Output type to push-pull */
    GPIOC->OTYPER |= 0x00000000;
    /* No pull-up, pull-down for PDx pins */
    GPIOC->PUPDR |= 0x00000000;
  #endif /* STM32F446xx */
  
    /* Connect PDx pins to FMC Alternate function */
    GPIOD->AFR[0] = 0x000000CC;
    GPIOD->AFR[1] = 0xCC000CCC;
    /* Configure PDx pins in Alternate function mode */
    GPIOD->MODER = 0xA02A000A;
    /* Configure PDx pins speed to 50 MHz */
    GPIOD->OSPEEDR = 0xA02A000A;
    /* Configure PDx pins Output type to push-pull */
    GPIOD->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PDx pins */
    GPIOD->PUPDR = 0x00000000;
  
    /* Connect PEx pins to FMC Alternate function */
    GPIOE->AFR[0] = 0xC00000CC;
    GPIOE->AFR[1] = 0xCCCCCCCC;
    /* Configure PEx pins in Alternate function mode */
    GPIOE->MODER = 0xAAAA800A;
    /* Configure PEx pins speed to 50 MHz */
    GPIOE->OSPEEDR = 0xAAAA800A;
    /* Configure PEx pins Output type to push-pull */
    GPIOE->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PEx pins */
    GPIOE->PUPDR = 0x00000000;
  
    /* Connect PFx pins to FMC Alternate function */
    GPIOF->AFR[0] = 0xCCCCCCCC;
    GPIOF->AFR[1] = 0xCCCCCCCC;
    /* Configure PFx pins in Alternate function mode */
    GPIOF->MODER = 0xAA800AAA;
    /* Configure PFx pins speed to 50 MHz */
    GPIOF->OSPEEDR = 0xAA800AAA;
    /* Configure PFx pins Output type to push-pull */
    GPIOF->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PFx pins */
    GPIOF->PUPDR = 0x00000000;
  
    /* Connect PGx pins to FMC Alternate function */
    GPIOG->AFR[0] = 0xCCCCCCCC;
    GPIOG->AFR[1] = 0xCCCCCCCC;
    /* Configure PGx pins in Alternate function mode */
    GPIOG->MODER = 0xAAAAAAAA;
    /* Configure PGx pins speed to 50 MHz */
    GPIOG->OSPEEDR = 0xAAAAAAAA;
    /* Configure PGx pins Output type to push-pull */
    GPIOG->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PGx pins */
    GPIOG->PUPDR = 0x00000000;
  
  #if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
   || defined(STM32F469xx) || defined(STM32F479xx)  
    /* Connect PHx pins to FMC Alternate function */
    GPIOH->AFR[0] = 0x00C0CC00;
    GPIOH->AFR[1] = 0xCCCCCCCC;
    /* Configure PHx pins in Alternate function mode */
    GPIOH->MODER = 0xAAAA08A0;
    /* Configure PHx pins speed to 50 MHz */
    GPIOH->OSPEEDR = 0xAAAA08A0;
    /* Configure PHx pins Output type to push-pull */
    GPIOH->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PHx pins */
    GPIOH->PUPDR = 0x00000000;
  
    /* Connect PIx pins to FMC Alternate function */
    GPIOI->AFR[0] = 0xCCCCCCCC;
    GPIOI->AFR[1] = 0x00000CC0;
    /* Configure PIx pins in Alternate function mode */
    GPIOI->MODER = 0x0028AAAA;
    /* Configure PIx pins speed to 50 MHz */
    GPIOI->OSPEEDR = 0x0028AAAA;
    /* Configure PIx pins Output type to push-pull */
    GPIOI->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PIx pins */
    GPIOI->PUPDR = 0x00000000;
  #endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx */
  
    /*-- FMC Configuration -------------------------------------------------------*/
    /* Enable the FMC interface clock */
    RCC->AHB3ENR |= 0x00000001;
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
  
    /* Configure and enable SDRAM bank1 */
  #if defined(STM32F446xx)
    FMC_Bank5_6->SDCR[0] = 0x00001954;
  #else  
    FMC_Bank5_6->SDCR[0] = 0x000019E4;
  #endif /* STM32F446xx */
    FMC_Bank5_6->SDTR[0] = 0x01115351;
  
    /* SDRAM initialization sequence */
    /* Clock enable command */
    FMC_Bank5_6->SDCMR = 0x00000011;
    tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* Delay */
    for (index = 0; index<1000; index++);
  
    /* PALL command */
    FMC_Bank5_6->SDCMR = 0x00000012;
    timeout = 0xFFFF;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* Auto refresh command */
  #if defined(STM32F446xx)
    FMC_Bank5_6->SDCMR = 0x000000F3;
  #else  
    FMC_Bank5_6->SDCMR = 0x00000073;
  #endif /* STM32F446xx */
    timeout = 0xFFFF;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* MRD register program */
  #if defined(STM32F446xx)
    FMC_Bank5_6->SDCMR = 0x00044014;
  #else  
    FMC_Bank5_6->SDCMR = 0x00046014;
  #endif /* STM32F446xx */
    timeout = 0xFFFF;
    while((tmpreg != 0) && (timeout-- > 0))
    {
      tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
    }
  
    /* Set refresh count */
    tmpreg = FMC_Bank5_6->SDRTR;
  #if defined(STM32F446xx)
    FMC_Bank5_6->SDRTR = (tmpreg | (0x0000050C<<1));
  #else    
    FMC_Bank5_6->SDRTR = (tmpreg | (0x0000027C<<1));
  #endif /* STM32F446xx */
  
    /* Disable write protection */
    tmpreg = FMC_Bank5_6->SDCR[0];
    FMC_Bank5_6->SDCR[0] = (tmpreg & 0xFFFFFDFF);
  #endif /* DATA_IN_ExtSDRAM */
  #endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F446xx || STM32F469xx || STM32F479xx */
  
  #if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx)\
   || defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
   || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx)
  
  #if defined(DATA_IN_ExtSRAM)
    /*-- GPIOs Configuration -----------------------------------------------------*/
    /* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */
    RCC->AHB1ENR |= 0x00000078;
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIODEN);
  
    /* Connect PDx pins to FMC Alternate function */
    GPIOD->AFR[0] = 0x00CCC0CC;
    GPIOD->AFR[1] = 0xCCCCCCCC;
    /* Configure PDx pins in Alternate function mode */
    GPIOD->MODER = 0xAAAA0A8A;
    /* Configure PDx pins speed to 100 MHz */
    GPIOD->OSPEEDR = 0xFFFF0FCF;
    /* Configure PDx pins Output type to push-pull */
    GPIOD->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PDx pins */
    GPIOD->PUPDR = 0x00000000;
  
    /* Connect PEx pins to FMC Alternate function */
    GPIOE->AFR[0] = 0xC00CC0CC;
    GPIOE->AFR[1] = 0xCCCCCCCC;
    /* Configure PEx pins in Alternate function mode */
    GPIOE->MODER = 0xAAAA828A;
    /* Configure PEx pins speed to 100 MHz */
    GPIOE->OSPEEDR = 0xFFFFC3CF;
    /* Configure PEx pins Output type to push-pull */
    GPIOE->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PEx pins */
    GPIOE->PUPDR = 0x00000000;
  
    /* Connect PFx pins to FMC Alternate function */
    GPIOF->AFR[0] = 0x00CCCCCC;
    GPIOF->AFR[1] = 0xCCCC0000;
    /* Configure PFx pins in Alternate function mode */
    GPIOF->MODER = 0xAA000AAA;
    /* Configure PFx pins speed to 100 MHz */
    GPIOF->OSPEEDR = 0xFF000FFF;
    /* Configure PFx pins Output type to push-pull */
    GPIOF->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PFx pins */
    GPIOF->PUPDR = 0x00000000;
  
    /* Connect PGx pins to FMC Alternate function */
    GPIOG->AFR[0] = 0x00CCCCCC;
    GPIOG->AFR[1] = 0x000000C0;
    /* Configure PGx pins in Alternate function mode */
    GPIOG->MODER = 0x00085AAA;
    /* Configure PGx pins speed to 100 MHz */
    GPIOG->OSPEEDR = 0x000CAFFF;
    /* Configure PGx pins Output type to push-pull */
    GPIOG->OTYPER = 0x00000000;
    /* No pull-up, pull-down for PGx pins */
    GPIOG->PUPDR = 0x00000000;
  
    /*-- FMC/FSMC Configuration --------------------------------------------------*/
    /* Enable the FMC/FSMC interface clock */
    RCC->AHB3ENR |= 0x00000001;
  
  #if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
    /* Configure and enable Bank1_SRAM2 */
    FMC_Bank1->BTCR[2] = 0x00001011;
    FMC_Bank1->BTCR[3] = 0x00000201;
    FMC_Bank1E->BWTR[2] = 0x0fffffff;
  #endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */ 
  #if defined(STM32F469xx) || defined(STM32F479xx)
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
    /* Configure and enable Bank1_SRAM2 */
    FMC_Bank1->BTCR[2] = 0x00001091;
    FMC_Bank1->BTCR[3] = 0x00110212;
    FMC_Bank1E->BWTR[2] = 0x0fffffff;
  #endif /* STM32F469xx || STM32F479xx */
  #if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx)|| defined(STM32F417xx)\
     || defined(STM32F412Zx) || defined(STM32F412Vx)
    /* Delay after an RCC peripheral clock enabling */
    tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FSMCEN);
    /* Configure and enable Bank1_SRAM2 */
    FSMC_Bank1->BTCR[2] = 0x00001011;
    FSMC_Bank1->BTCR[3] = 0x00000201;
    FSMC_Bank1E->BWTR[2] = 0x0FFFFFFF;
  #endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F412Zx || STM32F412Vx */
  
  #endif /* DATA_IN_ExtSRAM */
  #endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F427xx || STM32F437xx ||\
            STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx || STM32F412Zx || STM32F412Vx  */ 
    (void)(tmp);
  }
  #endif /* DATA_IN_ExtSRAM && DATA_IN_ExtSDRAM */
  /**
   * @}
   */
  
  /**
   * @}
   */
  
  /**
   * @}
   */
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  