src/main/startup/system_stm32g4xx.h

   1 /**
   2   ******************************************************************************
   3   * @file    system_stm32g4xx.h
   4   * @author  MCD Application Team
   5   * @brief   CMSIS Cortex-M4 Device System Source File for STM32G4xx devices.
   6   ******************************************************************************
   7   * @attention
   8   *
   9   * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
  10   * All rights reserved.</center></h2>
  11   *
  12   * This software component is licensed by ST under BSD 3-Clause license,
  13   * the "License"; You may not use this file except in compliance with the
  14   * License. You may obtain a copy of the License at:
  15   *                        opensource.org/licenses/BSD-3-Clause
  16   *
  17   ******************************************************************************
  18   */
  19 #pragma once
  20
  21 /** @addtogroup CMSIS
  22   * @{
  23   */
  24
  25 /** @addtogroup stm32g4xx_system
  26   * @{
  27   */
  28
  29 #ifdef __cplusplus
  30  extern "C" {
  31 #endif
  32
  33 /** @addtogroup STM32G4xx_System_Includes
  34   * @{
  35   */
  36
  37 /**
  38   * @}
  39   */
  40
  41
  42 /** @addtogroup STM32G4xx_System_Exported_Variables
  43   * @{
  44   */
  45   /* The SystemCoreClock variable is updated in three ways:
  46       1) by calling CMSIS function SystemCoreClockUpdate()
  47       2) by calling HAL API function HAL_RCC_GetSysClockFreq()
  48       3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
  49          Note: If you use this function to configure the system clock; then there
  50                is no need to call the 2 first functions listed above, since SystemCoreClock
  51                variable is updated automatically.
  52   */
  53 extern uint32_t SystemCoreClock;            /*!< System Clock Frequency (Core Clock) */
  54
  55 extern const uint8_t  AHBPrescTable[16];    /*!< AHB prescalers table values */
  56 extern const uint8_t  APBPrescTable[8];     /*!< APB prescalers table values */
  57
  58 /**
  59   * @}
  60   */
  61
  62 /** @addtogroup STM32G4xx_System_Exported_Constants
  63   * @{
  64   */
  65
  66 /**
  67   * @}
  68   */
  69
  70 /** @addtogroup STM32G4xx_System_Exported_Macros
  71   * @{
  72   */
  73
  74 /**
  75   * @}
  76   */
  77
  78 /** @addtogroup STM32G4xx_System_Exported_Functions
  79   * @{
  80   */
  81
  82 extern void SystemInit(void);
  83 extern void SystemCoreClockUpdate(void);
  84
  85 extern void systemClockSetHSEValue(uint32_t frequency);
  86 extern void OverclockRebootIfNecessary(unsigned requestedOverclockLevel);
  87 extern int SystemSYSCLKSource(void);
  88 extern int SystemPLLSource(void);
  89
  90 /**
  91   * @}
  92   */
  93
  94 #ifdef __cplusplus
  95 }
  96 #endif
  97
  98 /**
  99   * @}
 100   */
 101
 102 /**
 103   * @}
 104   */
 105 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/