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  1. /**
  2.   ******************************************************************************
  3.   * @file    system_stm32l1xx.h
  4.   * @author  MCD Application Team
  5.   * @brief   CMSIS Cortex-M3 Device System Source File for STM32L1xx devices.  
  6.   ******************************************************************************
  7.   * @attention
  8.   *
  9.   * Copyright (c) 2017-2021 STMicroelectronics.
  10.   * All rights reserved.
  11.   *
  12.   * This software is licensed under terms that can be found in the LICENSE file
  13.   * in the root directory of this software component.
  14.   * If no LICENSE file comes with this software, it is provided AS-IS.
  15.   *
  16.   ******************************************************************************
  17.   */
  18.  
  19. /** @addtogroup CMSIS
  20.   * @{
  21.   */
  22.  
  23. /** @addtogroup stm32l1xx_system
  24.   * @{
  25.   */  
  26.  
  27. /**
  28.   * @brief Define to prevent recursive inclusion
  29.   */
  30. #ifndef __SYSTEM_STM32L1XX_H
  31. #define __SYSTEM_STM32L1XX_H
  32.  
  33. #ifdef __cplusplus
  34.  extern "C" {
  35. #endif
  36.  
  37. /** @addtogroup STM32L1xx_System_Includes
  38.   * @{
  39.   */
  40.  
  41. /**
  42.   * @}
  43.   */
  44.  
  45.  
  46. /** @addtogroup STM32L1xx_System_Exported_types
  47.   * @{
  48.   */
  49.   /* This variable is updated in three ways:
  50.       1) by calling CMSIS function SystemCoreClockUpdate()
  51.       2) by calling HAL API function HAL_RCC_GetSysClockFreq()
  52.       3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
  53.          Note: If you use this function to configure the system clock; then there
  54.                is no need to call the 2 first functions listed above, since SystemCoreClock
  55.                variable is updated automatically.
  56.   */
  57. extern uint32_t SystemCoreClock;          /*!< System Clock Frequency (Core Clock) */
  58. /*
  59. */
  60. extern const uint8_t AHBPrescTable[16];   /*!< AHB prescalers table values */
  61. extern const uint8_t APBPrescTable[8];    /*!< APB prescalers table values */
  62. extern const uint8_t PLLMulTable[9];      /*!< PLL multipiers table values */
  63.  
  64. /**
  65.   * @}
  66.   */
  67.  
  68. /** @addtogroup STM32L1xx_System_Exported_Constants
  69.   * @{
  70.   */
  71.  
  72. /**
  73.   * @}
  74.   */
  75.  
  76. /** @addtogroup STM32L1xx_System_Exported_Macros
  77.   * @{
  78.   */
  79.  
  80. /**
  81.   * @}
  82.   */
  83.  
  84. /** @addtogroup STM32L1xx_System_Exported_Functions
  85.   * @{
  86.   */
  87.  
  88. extern void SystemInit(void);
  89. extern void SystemCoreClockUpdate(void);
  90. /**
  91.   * @}
  92.   */
  93.  
  94. #ifdef __cplusplus
  95. }
  96. #endif
  97.  
  98. #endif /*__SYSTEM_STM32L1XX_H */
  99.  
  100. /**
  101.   * @}
  102.   */
  103.  
  104. /**
  105.   * @}
  106.   */  
  107.  
  108.