1 /** 2 ****************************************************************************** 3 * @file system_stm32l4xx.h 4 * @author MCD Application Team 5 * @brief CMSIS Cortex-M4 Device System Source File for STM32L4xx devices. 6 ****************************************************************************** 7 * @attention 8 * 9 * <h2><center>© Copyright (c) 2017 STMicroelectronics. 10 * All rights reserved.</center></h2> 11 * 12 * This software component is licensed by ST under Apache License, Version 2.0, 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/Apache-2.0 16 * 17 ****************************************************************************** 18 */ 19 20 /** @addtogroup CMSIS 21 * @{ 22 */ 23 24 /** @addtogroup stm32l4xx_system 25 * @{ 26 */ 27 28 /** 29 * @brief Define to prevent recursive inclusion 30 */ 31 #ifndef __SYSTEM_STM32L4XX_H 32 #define __SYSTEM_STM32L4XX_H 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 /** @addtogroup STM32L4xx_System_Includes 39 * @{ 40 */ 41 42 /** 43 * @} 44 */ 45 46 47 /** @addtogroup STM32L4xx_System_Exported_Variables 48 * @{ 49 */ 50 /* The SystemCoreClock variable is updated in three ways: 51 1) by calling CMSIS function SystemCoreClockUpdate() 52 2) by calling HAL API function HAL_RCC_GetSysClockFreq() 53 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 54 Note: If you use this function to configure the system clock; then there 55 is no need to call the 2 first functions listed above, since SystemCoreClock 56 variable is updated automatically. 57 */ 58 extern uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock) */ 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 uint32_t MSIRangeTable[12]; /*!< MSI ranges table values */ 63 64 /** 65 * @} 66 */ 67 68 /** @addtogroup STM32L4xx_System_Exported_Constants 69 * @{ 70 */ 71 72 /** 73 * @} 74 */ 75 76 /** @addtogroup STM32L4xx_System_Exported_Macros 77 * @{ 78 */ 79 80 /** 81 * @} 82 */ 83 84 /** @addtogroup STM32L4xx_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_STM32L4XX_H */ 99 100 /** 101 * @} 102 */ 103 104 /** 105 * @} 106 */ 107 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ 108