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/**

  ******************************************************************************

  * @file    system_stm32l1xx.c

  * @author  MCD Application Team

  * @brief   CMSIS Cortex-M3 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_stm32l1xx.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 (c) 2017 STMicroelectronics.

  * All rights reserved.</center></h2>

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the

  * License. You may obtain a copy of the License at:

  *                        opensource.org/licenses/BSD-3-Clause

  *

  ******************************************************************************

  */

/** @addtogroup CMSIS

  * @{

  */

/** @addtogroup stm32l1xx_system

  * @{

  */  

/** @addtogroup STM32L1xx_System_Private_Includes

  * @{

  */

#include "stm32l1xx.h"

/**

  * @}

  */

/** @addtogroup STM32L1xx_System_Private_TypesDefinitions

  * @{

  */

/**

  * @}

  */

/** @addtogroup STM32L1xx_System_Private_Defines

  * @{

  */

#if !defined  (HSE_VALUE) 

  #define HSE_VALUE    ((uint32_t)8000000U) /*!< Default value of the External oscillator in Hz.

                                                This value can be provided and adapted by the user application. */

#endif /* HSE_VALUE */

#if !defined  (HSI_VALUE)

  #define HSI_VALUE    ((uint32_t)8000000U) /*!< Default value of the Internal oscillator in Hz.

                                                This value can be provided and adapted by the user application. */

#endif /* HSI_VALUE */

/*!< Uncomment the following line if you need to use external SRAM mounted

     on STM32L152D_EVAL board as data memory  */

/* #define DATA_IN_ExtSRAM */

/*!< Uncomment the following line if you need to relocate your vector Table in

     Internal SRAM. */

/* #define VECT_TAB_SRAM */

#define VECT_TAB_OFFSET  0x00U /*!< Vector Table base offset field. 

                                  This value must be a multiple of 0x200. */

/**

  * @}

  */

/** @addtogroup STM32L1xx_System_Private_Macros

  * @{

  */

/**

  * @}

  */

/** @addtogroup STM32L1xx_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        = 2097000U;

const uint8_t PLLMulTable[9]    = {3U, 4U, 6U, 8U, 12U, 16U, 24U, 32U, 48U};

const uint8_t AHBPrescTable[16] = {0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U, 6U, 7U, 8U, 9U};

const uint8_t APBPrescTable[8]  = {0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U};

/**

  * @}

  */

/** @addtogroup STM32L1xx_System_Private_FunctionPrototypes

  * @{

  */

#if defined (STM32L151xD) || defined (STM32L152xD) || defined (STM32L162xD)

#ifdef DATA_IN_ExtSRAM

  static void SystemInit_ExtMemCtl(void);

#endif /* DATA_IN_ExtSRAM */

#endif /* STM32L151xD || STM32L152xD || STM32L162xD */

/**

  * @}

  */

/** @addtogroup STM32L1xx_System_Private_Functions

  * @{

  */

/**

  * @brief  Setup the microcontroller system.

  *         Initialize the Embedded Flash Interface, the PLL and update the

  *         SystemCoreClock variable.

  * @param  None

  * @retval None

  */

void SystemInit (void)

{

#ifdef DATA_IN_ExtSRAM

  SystemInit_ExtMemCtl();

#endif /* DATA_IN_ExtSRAM */

#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 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 MSI, SystemCoreClock will contain the MSI

  *             value as defined by the MSI range.

  *                                  

  *           - 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 stm32l1xx.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 stm32l1xx.h file (default value

  *              8 MHz), 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, pllmul = 0, plldiv = 0, pllsource = 0, msirange = 0;

  /* Get SYSCLK source -------------------------------------------------------*/

  tmp = RCC->CFGR & RCC_CFGR_SWS;

  switch (tmp)

  {

    case 0x00:  /* MSI used as system clock */

      msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE) >> 13;

      SystemCoreClock = (32768 * (1 << (msirange + 1)));

      break;

    case 0x04:  /* HSI used as system clock */

      SystemCoreClock = HSI_VALUE;

      break;

    case 0x08:  /* HSE used as system clock */

      SystemCoreClock = HSE_VALUE;

      break;

    case 0x0C:  /* PLL used as system clock */

      /* Get PLL clock source and multiplication factor ----------------------*/

      pllmul = RCC->CFGR & RCC_CFGR_PLLMUL;

      plldiv = RCC->CFGR & RCC_CFGR_PLLDIV;

      pllmul = PLLMulTable[(pllmul >> 18)];

      plldiv = (plldiv >> 22) + 1;

      pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;

      if (pllsource == 0x00)

      {

        /* HSI oscillator clock selected as PLL clock entry */

        SystemCoreClock = (((HSI_VALUE) * pllmul) / plldiv);

      }

      else

      {

        /* HSE selected as PLL clock entry */

        SystemCoreClock = (((HSE_VALUE) * pllmul) / plldiv);

      }

      break;

    default: /* MSI used as system clock */

      msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE) >> 13;

      SystemCoreClock = (32768 * (1 << (msirange + 1)));

      break;

  }

  /* Compute HCLK clock frequency --------------------------------------------*/

  /* Get HCLK prescaler */

  tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];

  /* HCLK clock frequency */

  SystemCoreClock >>= tmp;

}

#if defined (STM32L151xD) || defined (STM32L152xD) || defined (STM32L162xD)

#ifdef DATA_IN_ExtSRAM

/**

  * @brief  Setup the external memory controller.

  *         Called in SystemInit() function before jump to main.

  *         This function configures the external SRAM mounted on STM32L152D_EVAL board

  *         This SRAM will be used as program data memory (including heap and stack).

  * @param  None

  * @retval None

  */

void SystemInit_ExtMemCtl(void)

{

  __IO uint32_t tmpreg = 0;

  /* Flash 1 wait state */

  FLASH->ACR |= FLASH_ACR_LATENCY;

  /* Power enable */

  RCC->APB1ENR |= RCC_APB1ENR_PWREN;

  /* Delay after an RCC peripheral clock enabling */

  tmpreg = READ_BIT(RCC->APB1ENR, RCC_APB1ENR_PWREN);

  /* Select the Voltage Range 1 (1.8 V) */

  PWR->CR = PWR_CR_VOS_0;

  /* Wait Until the Voltage Regulator is ready */

  while((PWR->CSR & PWR_CSR_VOSF) != RESET)

  {

  }

/*-- GPIOs Configuration -----------------------------------------------------*/

/*

 +-------------------+--------------------+------------------+------------------+

 +                       SRAM pins assignment                                   +

 +-------------------+--------------------+------------------+------------------+

 | PD0  <-> FSMC_D2  | PE0  <-> FSMC_NBL0 | PF0  <-> FSMC_A0 | PG0 <-> FSMC_A10 |

 | PD1  <-> FSMC_D3  | PE1  <-> FSMC_NBL1 | PF1  <-> FSMC_A1 | PG1 <-> FSMC_A11 |

 | PD4  <-> FSMC_NOE | PE7  <-> FSMC_D4   | PF2  <-> FSMC_A2 | PG2 <-> FSMC_A12 |

 | PD5  <-> FSMC_NWE | PE8  <-> FSMC_D5   | PF3  <-> FSMC_A3 | PG3 <-> FSMC_A13 |

 | PD8  <-> FSMC_D13 | PE9  <-> FSMC_D6   | PF4  <-> FSMC_A4 | PG4 <-> FSMC_A14 |

 | PD9  <-> FSMC_D14 | PE10 <-> FSMC_D7   | PF5  <-> FSMC_A5 | PG5 <-> FSMC_A15 |

 | PD10 <-> FSMC_D15 | PE11 <-> FSMC_D8   | PF12 <-> FSMC_A6 | PG10<-> FSMC_NE2 |

 | PD11 <-> FSMC_A16 | PE12 <-> FSMC_D9   | PF13 <-> FSMC_A7 |------------------+

 | PD12 <-> FSMC_A17 | PE13 <-> FSMC_D10  | PF14 <-> FSMC_A8 |

 | PD13 <-> FSMC_A18 | PE14 <-> FSMC_D11  | PF15 <-> FSMC_A9 |

 | PD14 <-> FSMC_D0  | PE15 <-> FSMC_D12  |------------------+

 | PD15 <-> FSMC_D1  |--------------------+

 +-------------------+

*/

  /* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */

  RCC->AHBENR   = 0x000080D8;

  /* Delay after an RCC peripheral clock enabling */

  tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_GPIODEN);

  /* Connect PDx pins to FSMC Alternate function */

  GPIOD->AFR[0]  = 0x00CC00CC;

  GPIOD->AFR[1]  = 0xCCCCCCCC;

  /* Configure PDx pins in Alternate function mode */  

  GPIOD->MODER   = 0xAAAA0A0A;

  /* Configure PDx pins speed to 40 MHz */  

  GPIOD->OSPEEDR = 0xFFFF0F0F;

  /* 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 FSMC 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 40 MHz */

  GPIOE->OSPEEDR = 0xFFFFC00F;

  /* 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 FSMC 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 40 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 FSMC Alternate function */

  GPIOG->AFR[0]  = 0x00CCCCCC;

  GPIOG->AFR[1]  = 0x00000C00;

  /* Configure PGx pins in Alternate function mode */

  GPIOG->MODER   = 0x00200AAA;

  /* Configure PGx pins speed to 40 MHz */

  GPIOG->OSPEEDR = 0x00300FFF;

  /* Configure PGx pins Output type to push-pull */  

  GPIOG->OTYPER  = 0x00000000;

  /* No pull-up, pull-down for PGx pins */

  GPIOG->PUPDR   = 0x00000000;

/*-- FSMC Configuration ------------------------------------------------------*/

  /* Enable the FSMC interface clock */

  RCC->AHBENR    = 0x400080D8;

  /* Delay after an RCC peripheral clock enabling */

  tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_FSMCEN);

  (void)(tmpreg);

  /* Configure and enable Bank1_SRAM3 */

  FSMC_Bank1->BTCR[4]  = 0x00001011;

  FSMC_Bank1->BTCR[5]  = 0x00000300;

  FSMC_Bank1E->BWTR[4] = 0x0FFFFFFF;

/*

  Bank1_SRAM3 is configured as follow:

  p.FSMC_AddressSetupTime = 0;

  p.FSMC_AddressHoldTime = 0;

  p.FSMC_DataSetupTime = 3;

  p.FSMC_BusTurnAroundDuration = 0;

  p.FSMC_CLKDivision = 0;

  p.FSMC_DataLatency = 0;

  p.FSMC_AccessMode = FSMC_AccessMode_A;

  FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM3;

  FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;

  FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM;

  FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;

  FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;

  FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable;

  FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;

  FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;

  FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;

  FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;

  FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;

  FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;

  FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;

  FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p;

  FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &p;

  FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);

  FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM3, ENABLE);

*/

}

#endif /* DATA_IN_ExtSRAM */

#endif /* STM32L151xD || STM32L152xD || STM32L162xD */

/**

  * @}

  */

/**

  * @}

  */

/**

  * @}

  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/