system_stm32l4xx.h 3.8 KB

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  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>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
  10. *
  11. * Redistribution and use in source and binary forms, with or without modification,
  12. * are permitted provided that the following conditions are met:
  13. * 1. Redistributions of source code must retain the above copyright notice,
  14. * this list of conditions and the following disclaimer.
  15. * 2. Redistributions in binary form must reproduce the above copyright notice,
  16. * this list of conditions and the following disclaimer in the documentation
  17. * and/or other materials provided with the distribution.
  18. * 3. Neither the name of STMicroelectronics nor the names of its contributors
  19. * may be used to endorse or promote products derived from this software
  20. * without specific prior written permission.
  21. *
  22. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23. * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  25. * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  26. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  28. * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  29. * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32. *
  33. ******************************************************************************
  34. */
  35. /** @addtogroup CMSIS
  36. * @{
  37. */
  38. /** @addtogroup stm32l4xx_system
  39. * @{
  40. */
  41. /**
  42. * @brief Define to prevent recursive inclusion
  43. */
  44. #ifndef __SYSTEM_STM32L4XX_H
  45. #define __SYSTEM_STM32L4XX_H
  46. #ifdef __cplusplus
  47. extern "C" {
  48. #endif
  49. /** @addtogroup STM32L4xx_System_Includes
  50. * @{
  51. */
  52. /**
  53. * @}
  54. */
  55. /** @addtogroup STM32L4xx_System_Exported_Variables
  56. * @{
  57. */
  58. /* The SystemCoreClock variable is updated in three ways:
  59. 1) by calling CMSIS function SystemCoreClockUpdate()
  60. 2) by calling HAL API function HAL_RCC_GetSysClockFreq()
  61. 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
  62. Note: If you use this function to configure the system clock; then there
  63. is no need to call the 2 first functions listed above, since SystemCoreClock
  64. variable is updated automatically.
  65. */
  66. extern uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock) */
  67. extern const uint8_t AHBPrescTable[16]; /*!< AHB prescalers table values */
  68. extern const uint8_t APBPrescTable[8]; /*!< APB prescalers table values */
  69. extern const uint32_t MSIRangeTable[12]; /*!< MSI ranges table values */
  70. /**
  71. * @}
  72. */
  73. /** @addtogroup STM32L4xx_System_Exported_Constants
  74. * @{
  75. */
  76. /**
  77. * @}
  78. */
  79. /** @addtogroup STM32L4xx_System_Exported_Macros
  80. * @{
  81. */
  82. /**
  83. * @}
  84. */
  85. /** @addtogroup STM32L4xx_System_Exported_Functions
  86. * @{
  87. */
  88. extern void SystemInit(void);
  89. extern void SystemCoreClockUpdate(void);
  90. /**
  91. * @}
  92. */
  93. #ifdef __cplusplus
  94. }
  95. #endif
  96. #endif /*__SYSTEM_STM32L4XX_H */
  97. /**
  98. * @}
  99. */
  100. /**
  101. * @}
  102. */
  103. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/