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1 /**
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2 ******************************************************************************
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3 * @file system_stm32l4xx.h
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4 * @author MCD Application Team
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5 * @version V1.2.0
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6 * @date 28-October-2016
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7 * @brief CMSIS Cortex-M4 Device System Source File for STM32L4xx devices.
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8 ******************************************************************************
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9 * @attention
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10 *
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11 * <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
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12 *
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13 * Redistribution and use in source and binary forms, with or without modification,
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14 * are permitted provided that the following conditions are met:
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15 * 1. Redistributions of source code must retain the above copyright notice,
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16 * this list of conditions and the following disclaimer.
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17 * 2. Redistributions in binary form must reproduce the above copyright notice,
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18 * this list of conditions and the following disclaimer in the documentation
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19 * and/or other materials provided with the distribution.
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20 * 3. Neither the name of STMicroelectronics nor the names of its contributors
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21 * may be used to endorse or promote products derived from this software
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22 * without specific prior written permission.
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23 *
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24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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31 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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34 *
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35 ******************************************************************************
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36 */
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37
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38 /** @addtogroup CMSIS
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39 * @{
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40 */
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41
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42 /** @addtogroup stm32l4xx_system
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43 * @{
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44 */
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45
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46 /**
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47 * @brief Define to prevent recursive inclusion
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48 */
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49 #ifndef __SYSTEM_STM32L4XX_H
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50 #define __SYSTEM_STM32L4XX_H
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51
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52 #ifdef __cplusplus
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53 extern "C" {
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54 #endif
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55
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56 /** @addtogroup STM32L4xx_System_Includes
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57 * @{
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58 */
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59
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60 /**
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61 * @}
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62 */
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63
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64
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65 /** @addtogroup STM32L4xx_System_Exported_Variables
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66 * @{
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67 */
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68 /* The SystemCoreClock variable is updated in three ways:
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69 1) by calling CMSIS function SystemCoreClockUpdate()
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70 2) by calling HAL API function HAL_RCC_GetSysClockFreq()
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71 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
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72 Note: If you use this function to configure the system clock; then there
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73 is no need to call the 2 first functions listed above, since SystemCoreClock
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74 variable is updated automatically.
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75 */
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76 extern uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock) */
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77
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78 extern const uint8_t AHBPrescTable[16]; /*!< AHB prescalers table values */
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79 extern const uint8_t APBPrescTable[8]; /*!< APB prescalers table values */
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80 extern const uint32_t MSIRangeTable[12]; /*!< MSI ranges table values */
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81
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82 /**
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83 * @}
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84 */
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85
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86 /** @addtogroup STM32L4xx_System_Exported_Constants
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87 * @{
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88 */
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89
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90 /**
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91 * @}
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92 */
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93
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94 /** @addtogroup STM32L4xx_System_Exported_Macros
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95 * @{
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96 */
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97
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98 /**
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99 * @}
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100 */
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101
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102 /** @addtogroup STM32L4xx_System_Exported_Functions
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103 * @{
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104 */
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105
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106 extern void SystemInit(void);
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107 extern void SystemCoreClockUpdate(void);
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108 /**
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109 * @}
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110 */
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111
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112 #ifdef __cplusplus
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113 }
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114 #endif
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115
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116 #endif /*__SYSTEM_STM32L4XX_H */
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117
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118 /**
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119 * @}
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120 */
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121
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122 /**
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123 * @}
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124 */
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125 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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