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I2C_SLAVE_TEST2_031_2/system_stm32g0xx.c@26:a047b389adfd, 2022-05-06 (annotated)
- Committer:
- caa45040
- Date:
- Fri May 06 14:22:30 2022 +0000
- Revision:
- 26:a047b389adfd
- Parent:
- 20:745e8267e7f5
i2c_slave_HC_SR04_010_BIN re
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
caa45040 | 20:745e8267e7f5 | 1 | /** |
caa45040 | 20:745e8267e7f5 | 2 | ****************************************************************************** |
caa45040 | 20:745e8267e7f5 | 3 | * @file system_stm32g0xx.c |
caa45040 | 20:745e8267e7f5 | 4 | * @author MCD Application Team |
caa45040 | 20:745e8267e7f5 | 5 | * @brief CMSIS Cortex-M0+ Device Peripheral Access Layer System Source File |
caa45040 | 20:745e8267e7f5 | 6 | * |
caa45040 | 20:745e8267e7f5 | 7 | * This file provides two functions and one global variable to be called from |
caa45040 | 20:745e8267e7f5 | 8 | * user application: |
caa45040 | 20:745e8267e7f5 | 9 | * - SystemInit(): This function is called at startup just after reset and |
caa45040 | 20:745e8267e7f5 | 10 | * before branch to main program. This call is made inside |
caa45040 | 20:745e8267e7f5 | 11 | * the "startup_stm32g0xx.s" file. |
caa45040 | 20:745e8267e7f5 | 12 | * |
caa45040 | 20:745e8267e7f5 | 13 | * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used |
caa45040 | 20:745e8267e7f5 | 14 | * by the user application to setup the SysTick |
caa45040 | 20:745e8267e7f5 | 15 | * timer or configure other parameters. |
caa45040 | 20:745e8267e7f5 | 16 | * |
caa45040 | 20:745e8267e7f5 | 17 | * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must |
caa45040 | 20:745e8267e7f5 | 18 | * be called whenever the core clock is changed |
caa45040 | 20:745e8267e7f5 | 19 | * during program execution. |
caa45040 | 20:745e8267e7f5 | 20 | * |
caa45040 | 20:745e8267e7f5 | 21 | * After each device reset the HSI (8 MHz then 16 MHz) is used as system clock source. |
caa45040 | 20:745e8267e7f5 | 22 | * Then SystemInit() function is called, in "startup_stm32g0xx.s" file, to |
caa45040 | 20:745e8267e7f5 | 23 | * configure the system clock before to branch to main program. |
caa45040 | 20:745e8267e7f5 | 24 | * |
caa45040 | 20:745e8267e7f5 | 25 | * This file configures the system clock as follows: |
caa45040 | 20:745e8267e7f5 | 26 | *============================================================================= |
caa45040 | 20:745e8267e7f5 | 27 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 28 | * System Clock source | HSI |
caa45040 | 20:745e8267e7f5 | 29 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 30 | * SYSCLK(Hz) | 16000000 |
caa45040 | 20:745e8267e7f5 | 31 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 32 | * HCLK(Hz) | 16000000 |
caa45040 | 20:745e8267e7f5 | 33 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 34 | * AHB Prescaler | 1 |
caa45040 | 20:745e8267e7f5 | 35 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 36 | * APB Prescaler | 1 |
caa45040 | 20:745e8267e7f5 | 37 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 38 | * HSI Division factor | 1 |
caa45040 | 20:745e8267e7f5 | 39 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 40 | * PLL_M | 1 |
caa45040 | 20:745e8267e7f5 | 41 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 42 | * PLL_N | 8 |
caa45040 | 20:745e8267e7f5 | 43 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 44 | * PLL_P | 7 |
caa45040 | 20:745e8267e7f5 | 45 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 46 | * PLL_Q | 2 |
caa45040 | 20:745e8267e7f5 | 47 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 48 | * PLL_R | 2 |
caa45040 | 20:745e8267e7f5 | 49 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 50 | * Require 48MHz for RNG | Disabled |
caa45040 | 20:745e8267e7f5 | 51 | *----------------------------------------------------------------------------- |
caa45040 | 20:745e8267e7f5 | 52 | *============================================================================= |
caa45040 | 20:745e8267e7f5 | 53 | ****************************************************************************** |
caa45040 | 20:745e8267e7f5 | 54 | * @attention |
caa45040 | 20:745e8267e7f5 | 55 | * |
caa45040 | 20:745e8267e7f5 | 56 | * <h2><center>© Copyright (c) 2018 STMicroelectronics. |
caa45040 | 20:745e8267e7f5 | 57 | * All rights reserved.</center></h2> |
caa45040 | 20:745e8267e7f5 | 58 | * |
caa45040 | 20:745e8267e7f5 | 59 | * This software component is licensed by ST under Apache License, Version 2.0, |
caa45040 | 20:745e8267e7f5 | 60 | * the "License"; You may not use this file except in compliance with the |
caa45040 | 20:745e8267e7f5 | 61 | * License. You may obtain a copy of the License at: |
caa45040 | 20:745e8267e7f5 | 62 | * opensource.org/licenses/Apache-2.0 |
caa45040 | 20:745e8267e7f5 | 63 | * |
caa45040 | 20:745e8267e7f5 | 64 | ****************************************************************************** |
caa45040 | 20:745e8267e7f5 | 65 | */ |
caa45040 | 20:745e8267e7f5 | 66 | |
caa45040 | 20:745e8267e7f5 | 67 | /** @addtogroup CMSIS |
caa45040 | 20:745e8267e7f5 | 68 | * @{ |
caa45040 | 20:745e8267e7f5 | 69 | */ |
caa45040 | 20:745e8267e7f5 | 70 | |
caa45040 | 20:745e8267e7f5 | 71 | /** @addtogroup stm32g0xx_system |
caa45040 | 20:745e8267e7f5 | 72 | * @{ |
caa45040 | 20:745e8267e7f5 | 73 | */ |
caa45040 | 20:745e8267e7f5 | 74 | |
caa45040 | 20:745e8267e7f5 | 75 | /** @addtogroup STM32G0xx_System_Private_Includes |
caa45040 | 20:745e8267e7f5 | 76 | * @{ |
caa45040 | 20:745e8267e7f5 | 77 | */ |
caa45040 | 20:745e8267e7f5 | 78 | |
caa45040 | 20:745e8267e7f5 | 79 | #include "stm32g0xx.h" |
caa45040 | 20:745e8267e7f5 | 80 | |
caa45040 | 20:745e8267e7f5 | 81 | #if !defined (HSE_VALUE) |
caa45040 | 20:745e8267e7f5 | 82 | #define HSE_VALUE (8000000UL) /*!< Value of the External oscillator in Hz */ |
caa45040 | 20:745e8267e7f5 | 83 | #endif /* HSE_VALUE */ |
caa45040 | 20:745e8267e7f5 | 84 | |
caa45040 | 20:745e8267e7f5 | 85 | #if !defined (HSI_VALUE) |
caa45040 | 20:745e8267e7f5 | 86 | #define HSI_VALUE (16000000UL) /*!< Value of the Internal oscillator in Hz*/ |
caa45040 | 20:745e8267e7f5 | 87 | #endif /* HSI_VALUE */ |
caa45040 | 20:745e8267e7f5 | 88 | |
caa45040 | 20:745e8267e7f5 | 89 | #if !defined (LSI_VALUE) |
caa45040 | 20:745e8267e7f5 | 90 | #define LSI_VALUE (32000UL) /*!< Value of LSI in Hz*/ |
caa45040 | 20:745e8267e7f5 | 91 | #endif /* LSI_VALUE */ |
caa45040 | 20:745e8267e7f5 | 92 | |
caa45040 | 20:745e8267e7f5 | 93 | #if !defined (LSE_VALUE) |
caa45040 | 20:745e8267e7f5 | 94 | #define LSE_VALUE (32768UL) /*!< Value of LSE in Hz*/ |
caa45040 | 20:745e8267e7f5 | 95 | #endif /* LSE_VALUE */ |
caa45040 | 20:745e8267e7f5 | 96 | |
caa45040 | 20:745e8267e7f5 | 97 | /** |
caa45040 | 20:745e8267e7f5 | 98 | * @} |
caa45040 | 20:745e8267e7f5 | 99 | */ |
caa45040 | 20:745e8267e7f5 | 100 | |
caa45040 | 20:745e8267e7f5 | 101 | /** @addtogroup STM32G0xx_System_Private_TypesDefinitions |
caa45040 | 20:745e8267e7f5 | 102 | * @{ |
caa45040 | 20:745e8267e7f5 | 103 | */ |
caa45040 | 20:745e8267e7f5 | 104 | |
caa45040 | 20:745e8267e7f5 | 105 | /** |
caa45040 | 20:745e8267e7f5 | 106 | * @} |
caa45040 | 20:745e8267e7f5 | 107 | */ |
caa45040 | 20:745e8267e7f5 | 108 | |
caa45040 | 20:745e8267e7f5 | 109 | /** @addtogroup STM32G0xx_System_Private_Defines |
caa45040 | 20:745e8267e7f5 | 110 | * @{ |
caa45040 | 20:745e8267e7f5 | 111 | */ |
caa45040 | 20:745e8267e7f5 | 112 | |
caa45040 | 20:745e8267e7f5 | 113 | /************************* Miscellaneous Configuration ************************/ |
caa45040 | 20:745e8267e7f5 | 114 | /*!< Uncomment the following line if you need to relocate your vector Table in |
caa45040 | 20:745e8267e7f5 | 115 | Internal SRAM. */ |
caa45040 | 20:745e8267e7f5 | 116 | /* #define VECT_TAB_SRAM */ |
caa45040 | 20:745e8267e7f5 | 117 | #define VECT_TAB_OFFSET 0x0U /*!< Vector Table base offset field. |
caa45040 | 20:745e8267e7f5 | 118 | This value must be a multiple of 0x100. */ |
caa45040 | 20:745e8267e7f5 | 119 | /******************************************************************************/ |
caa45040 | 20:745e8267e7f5 | 120 | /** |
caa45040 | 20:745e8267e7f5 | 121 | * @} |
caa45040 | 20:745e8267e7f5 | 122 | */ |
caa45040 | 20:745e8267e7f5 | 123 | |
caa45040 | 20:745e8267e7f5 | 124 | /** @addtogroup STM32G0xx_System_Private_Macros |
caa45040 | 20:745e8267e7f5 | 125 | * @{ |
caa45040 | 20:745e8267e7f5 | 126 | */ |
caa45040 | 20:745e8267e7f5 | 127 | |
caa45040 | 20:745e8267e7f5 | 128 | /** |
caa45040 | 20:745e8267e7f5 | 129 | * @} |
caa45040 | 20:745e8267e7f5 | 130 | */ |
caa45040 | 20:745e8267e7f5 | 131 | |
caa45040 | 20:745e8267e7f5 | 132 | /** @addtogroup STM32G0xx_System_Private_Variables |
caa45040 | 20:745e8267e7f5 | 133 | * @{ |
caa45040 | 20:745e8267e7f5 | 134 | */ |
caa45040 | 20:745e8267e7f5 | 135 | /* The SystemCoreClock variable is updated in three ways: |
caa45040 | 20:745e8267e7f5 | 136 | 1) by calling CMSIS function SystemCoreClockUpdate() |
caa45040 | 20:745e8267e7f5 | 137 | 2) by calling HAL API function HAL_RCC_GetHCLKFreq() |
caa45040 | 20:745e8267e7f5 | 138 | 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency |
caa45040 | 20:745e8267e7f5 | 139 | Note: If you use this function to configure the system clock; then there |
caa45040 | 20:745e8267e7f5 | 140 | is no need to call the 2 first functions listed above, since SystemCoreClock |
caa45040 | 20:745e8267e7f5 | 141 | variable is updated automatically. |
caa45040 | 20:745e8267e7f5 | 142 | */ |
caa45040 | 20:745e8267e7f5 | 143 | uint32_t SystemCoreClock = 16000000UL; |
caa45040 | 20:745e8267e7f5 | 144 | |
caa45040 | 20:745e8267e7f5 | 145 | const uint32_t AHBPrescTable[16UL] = {0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 1UL, 2UL, 3UL, 4UL, 6UL, 7UL, 8UL, 9UL}; |
caa45040 | 20:745e8267e7f5 | 146 | const uint32_t APBPrescTable[8UL] = {0UL, 0UL, 0UL, 0UL, 1UL, 2UL, 3UL, 4UL}; |
caa45040 | 20:745e8267e7f5 | 147 | |
caa45040 | 20:745e8267e7f5 | 148 | /** |
caa45040 | 20:745e8267e7f5 | 149 | * @} |
caa45040 | 20:745e8267e7f5 | 150 | */ |
caa45040 | 20:745e8267e7f5 | 151 | |
caa45040 | 20:745e8267e7f5 | 152 | /** @addtogroup STM32G0xx_System_Private_FunctionPrototypes |
caa45040 | 20:745e8267e7f5 | 153 | * @{ |
caa45040 | 20:745e8267e7f5 | 154 | */ |
caa45040 | 20:745e8267e7f5 | 155 | |
caa45040 | 20:745e8267e7f5 | 156 | /** |
caa45040 | 20:745e8267e7f5 | 157 | * @} |
caa45040 | 20:745e8267e7f5 | 158 | */ |
caa45040 | 20:745e8267e7f5 | 159 | |
caa45040 | 20:745e8267e7f5 | 160 | /** @addtogroup STM32G0xx_System_Private_Functions |
caa45040 | 20:745e8267e7f5 | 161 | * @{ |
caa45040 | 20:745e8267e7f5 | 162 | */ |
caa45040 | 20:745e8267e7f5 | 163 | |
caa45040 | 20:745e8267e7f5 | 164 | /** |
caa45040 | 20:745e8267e7f5 | 165 | * @brief Setup the microcontroller system. |
caa45040 | 20:745e8267e7f5 | 166 | * @param None |
caa45040 | 20:745e8267e7f5 | 167 | * @retval None |
caa45040 | 20:745e8267e7f5 | 168 | */ |
caa45040 | 20:745e8267e7f5 | 169 | void SystemInit(void) |
caa45040 | 20:745e8267e7f5 | 170 | { |
caa45040 | 20:745e8267e7f5 | 171 | /* Configure the Vector Table location add offset address ------------------*/ |
caa45040 | 20:745e8267e7f5 | 172 | #ifdef VECT_TAB_SRAM |
caa45040 | 20:745e8267e7f5 | 173 | SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */ |
caa45040 | 20:745e8267e7f5 | 174 | #else |
caa45040 | 20:745e8267e7f5 | 175 | SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */ |
caa45040 | 20:745e8267e7f5 | 176 | #endif |
caa45040 | 20:745e8267e7f5 | 177 | } |
caa45040 | 20:745e8267e7f5 | 178 | |
caa45040 | 20:745e8267e7f5 | 179 | /** |
caa45040 | 20:745e8267e7f5 | 180 | * @brief Update SystemCoreClock variable according to Clock Register Values. |
caa45040 | 20:745e8267e7f5 | 181 | * The SystemCoreClock variable contains the core clock (HCLK), it can |
caa45040 | 20:745e8267e7f5 | 182 | * be used by the user application to setup the SysTick timer or configure |
caa45040 | 20:745e8267e7f5 | 183 | * other parameters. |
caa45040 | 20:745e8267e7f5 | 184 | * |
caa45040 | 20:745e8267e7f5 | 185 | * @note Each time the core clock (HCLK) changes, this function must be called |
caa45040 | 20:745e8267e7f5 | 186 | * to update SystemCoreClock variable value. Otherwise, any configuration |
caa45040 | 20:745e8267e7f5 | 187 | * based on this variable will be incorrect. |
caa45040 | 20:745e8267e7f5 | 188 | * |
caa45040 | 20:745e8267e7f5 | 189 | * @note - The system frequency computed by this function is not the real |
caa45040 | 20:745e8267e7f5 | 190 | * frequency in the chip. It is calculated based on the predefined |
caa45040 | 20:745e8267e7f5 | 191 | * constant and the selected clock source: |
caa45040 | 20:745e8267e7f5 | 192 | * |
caa45040 | 20:745e8267e7f5 | 193 | * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(**) / HSI division factor |
caa45040 | 20:745e8267e7f5 | 194 | * |
caa45040 | 20:745e8267e7f5 | 195 | * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(***) |
caa45040 | 20:745e8267e7f5 | 196 | * |
caa45040 | 20:745e8267e7f5 | 197 | * - If SYSCLK source is LSI, SystemCoreClock will contain the LSI_VALUE |
caa45040 | 20:745e8267e7f5 | 198 | * |
caa45040 | 20:745e8267e7f5 | 199 | * - If SYSCLK source is LSE, SystemCoreClock will contain the LSE_VALUE |
caa45040 | 20:745e8267e7f5 | 200 | * |
caa45040 | 20:745e8267e7f5 | 201 | * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(***) |
caa45040 | 20:745e8267e7f5 | 202 | * or HSI_VALUE(*) multiplied/divided by the PLL factors. |
caa45040 | 20:745e8267e7f5 | 203 | * |
caa45040 | 20:745e8267e7f5 | 204 | * (**) HSI_VALUE is a constant defined in stm32g0xx_hal_conf.h file (default value |
caa45040 | 20:745e8267e7f5 | 205 | * 16 MHz) but the real value may vary depending on the variations |
caa45040 | 20:745e8267e7f5 | 206 | * in voltage and temperature. |
caa45040 | 20:745e8267e7f5 | 207 | * |
caa45040 | 20:745e8267e7f5 | 208 | * (***) HSE_VALUE is a constant defined in stm32g0xx_hal_conf.h file (default value |
caa45040 | 20:745e8267e7f5 | 209 | * 8 MHz), user has to ensure that HSE_VALUE is same as the real |
caa45040 | 20:745e8267e7f5 | 210 | * frequency of the crystal used. Otherwise, this function may |
caa45040 | 20:745e8267e7f5 | 211 | * have wrong result. |
caa45040 | 20:745e8267e7f5 | 212 | * |
caa45040 | 20:745e8267e7f5 | 213 | * - The result of this function could be not correct when using fractional |
caa45040 | 20:745e8267e7f5 | 214 | * value for HSE crystal. |
caa45040 | 20:745e8267e7f5 | 215 | * |
caa45040 | 20:745e8267e7f5 | 216 | * @param None |
caa45040 | 20:745e8267e7f5 | 217 | * @retval None |
caa45040 | 20:745e8267e7f5 | 218 | */ |
caa45040 | 20:745e8267e7f5 | 219 | void SystemCoreClockUpdate(void) |
caa45040 | 20:745e8267e7f5 | 220 | { |
caa45040 | 20:745e8267e7f5 | 221 | uint32_t tmp; |
caa45040 | 20:745e8267e7f5 | 222 | uint32_t pllvco; |
caa45040 | 20:745e8267e7f5 | 223 | uint32_t pllr; |
caa45040 | 20:745e8267e7f5 | 224 | uint32_t pllsource; |
caa45040 | 20:745e8267e7f5 | 225 | uint32_t pllm; |
caa45040 | 20:745e8267e7f5 | 226 | uint32_t hsidiv; |
caa45040 | 20:745e8267e7f5 | 227 | |
caa45040 | 20:745e8267e7f5 | 228 | /* Get SYSCLK source -------------------------------------------------------*/ |
caa45040 | 20:745e8267e7f5 | 229 | switch (RCC->CFGR & RCC_CFGR_SWS) |
caa45040 | 20:745e8267e7f5 | 230 | { |
caa45040 | 20:745e8267e7f5 | 231 | case RCC_CFGR_SWS_0: /* HSE used as system clock */ |
caa45040 | 20:745e8267e7f5 | 232 | SystemCoreClock = HSE_VALUE; |
caa45040 | 20:745e8267e7f5 | 233 | break; |
caa45040 | 20:745e8267e7f5 | 234 | |
caa45040 | 20:745e8267e7f5 | 235 | case (RCC_CFGR_SWS_1 | RCC_CFGR_SWS_0): /* LSI used as system clock */ |
caa45040 | 20:745e8267e7f5 | 236 | SystemCoreClock = LSI_VALUE; |
caa45040 | 20:745e8267e7f5 | 237 | break; |
caa45040 | 20:745e8267e7f5 | 238 | |
caa45040 | 20:745e8267e7f5 | 239 | case RCC_CFGR_SWS_2: /* LSE used as system clock */ |
caa45040 | 20:745e8267e7f5 | 240 | SystemCoreClock = LSE_VALUE; |
caa45040 | 20:745e8267e7f5 | 241 | break; |
caa45040 | 20:745e8267e7f5 | 242 | |
caa45040 | 20:745e8267e7f5 | 243 | case RCC_CFGR_SWS_1: /* PLL used as system clock */ |
caa45040 | 20:745e8267e7f5 | 244 | /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLLM) * PLLN |
caa45040 | 20:745e8267e7f5 | 245 | SYSCLK = PLL_VCO / PLLR |
caa45040 | 20:745e8267e7f5 | 246 | */ |
caa45040 | 20:745e8267e7f5 | 247 | pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC); |
caa45040 | 20:745e8267e7f5 | 248 | pllm = ((RCC->PLLCFGR & RCC_PLLCFGR_PLLM) >> RCC_PLLCFGR_PLLM_Pos) + 1UL; |
caa45040 | 20:745e8267e7f5 | 249 | |
caa45040 | 20:745e8267e7f5 | 250 | if(pllsource == 0x03UL) /* HSE used as PLL clock source */ |
caa45040 | 20:745e8267e7f5 | 251 | { |
caa45040 | 20:745e8267e7f5 | 252 | pllvco = (HSE_VALUE / pllm); |
caa45040 | 20:745e8267e7f5 | 253 | } |
caa45040 | 20:745e8267e7f5 | 254 | else /* HSI used as PLL clock source */ |
caa45040 | 20:745e8267e7f5 | 255 | { |
caa45040 | 20:745e8267e7f5 | 256 | pllvco = (HSI_VALUE / pllm); |
caa45040 | 20:745e8267e7f5 | 257 | } |
caa45040 | 20:745e8267e7f5 | 258 | pllvco = pllvco * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> RCC_PLLCFGR_PLLN_Pos); |
caa45040 | 20:745e8267e7f5 | 259 | pllr = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLR) >> RCC_PLLCFGR_PLLR_Pos) + 1UL); |
caa45040 | 20:745e8267e7f5 | 260 | |
caa45040 | 20:745e8267e7f5 | 261 | SystemCoreClock = pllvco/pllr; |
caa45040 | 20:745e8267e7f5 | 262 | break; |
caa45040 | 20:745e8267e7f5 | 263 | |
caa45040 | 20:745e8267e7f5 | 264 | case 0x00000000U: /* HSI used as system clock */ |
caa45040 | 20:745e8267e7f5 | 265 | default: /* HSI used as system clock */ |
caa45040 | 20:745e8267e7f5 | 266 | hsidiv = (1UL << ((READ_BIT(RCC->CR, RCC_CR_HSIDIV))>> RCC_CR_HSIDIV_Pos)); |
caa45040 | 20:745e8267e7f5 | 267 | SystemCoreClock = (HSI_VALUE/hsidiv); |
caa45040 | 20:745e8267e7f5 | 268 | break; |
caa45040 | 20:745e8267e7f5 | 269 | } |
caa45040 | 20:745e8267e7f5 | 270 | /* Compute HCLK clock frequency --------------------------------------------*/ |
caa45040 | 20:745e8267e7f5 | 271 | /* Get HCLK prescaler */ |
caa45040 | 20:745e8267e7f5 | 272 | tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> RCC_CFGR_HPRE_Pos)]; |
caa45040 | 20:745e8267e7f5 | 273 | /* HCLK clock frequency */ |
caa45040 | 20:745e8267e7f5 | 274 | SystemCoreClock >>= tmp; |
caa45040 | 20:745e8267e7f5 | 275 | } |
caa45040 | 20:745e8267e7f5 | 276 | |
caa45040 | 20:745e8267e7f5 | 277 | |
caa45040 | 20:745e8267e7f5 | 278 | /** |
caa45040 | 20:745e8267e7f5 | 279 | * @} |
caa45040 | 20:745e8267e7f5 | 280 | */ |
caa45040 | 20:745e8267e7f5 | 281 | |
caa45040 | 20:745e8267e7f5 | 282 | /** |
caa45040 | 20:745e8267e7f5 | 283 | * @} |
caa45040 | 20:745e8267e7f5 | 284 | */ |
caa45040 | 20:745e8267e7f5 | 285 | |
caa45040 | 20:745e8267e7f5 | 286 | /** |
caa45040 | 20:745e8267e7f5 | 287 | * @} |
caa45040 | 20:745e8267e7f5 | 288 | */ |
caa45040 | 20:745e8267e7f5 | 289 | |
caa45040 | 20:745e8267e7f5 | 290 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |
caa45040 | 20:745e8267e7f5 | 291 |