mbed library sources
Fork of mbed-src by
targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/system_stm32f4xx.c@106:ced8cbb51063, 2014-02-26 (annotated)
- Committer:
- mbed_official
- Date:
- Wed Feb 26 09:45:12 2014 +0000
- Revision:
- 106:ced8cbb51063
- Parent:
- 87:085cde657901
- Child:
- 125:23cc3068a9e4
Synchronized with git revision 4222735eff5868389433f0e9271976b39c8115cd
Full URL: https://github.com/mbedmicro/mbed/commit/4222735eff5868389433f0e9271976b39c8115cd/
[NUCLEO_xxx] Update STM32CubeF4 driver V1.0.0 + update license
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 87:085cde657901 | 1 | /** |
mbed_official | 87:085cde657901 | 2 | ****************************************************************************** |
mbed_official | 87:085cde657901 | 3 | * @file system_stm32f4xx.c |
mbed_official | 87:085cde657901 | 4 | * @author MCD Application Team |
mbed_official | 106:ced8cbb51063 | 5 | * @version V1.0.0 |
mbed_official | 106:ced8cbb51063 | 6 | * @date 18-February-2014 |
mbed_official | 87:085cde657901 | 7 | * @brief CMSIS Cortex-M4 Device Peripheral Access Layer System Source File. |
mbed_official | 87:085cde657901 | 8 | * |
mbed_official | 87:085cde657901 | 9 | * This file provides two functions and one global variable to be called from |
mbed_official | 87:085cde657901 | 10 | * user application: |
mbed_official | 87:085cde657901 | 11 | * - SystemInit(): This function is called at startup just after reset and |
mbed_official | 87:085cde657901 | 12 | * before branch to main program. This call is made inside |
mbed_official | 87:085cde657901 | 13 | * the "startup_stm32f4xx.s" file. |
mbed_official | 87:085cde657901 | 14 | * |
mbed_official | 87:085cde657901 | 15 | * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used |
mbed_official | 87:085cde657901 | 16 | * by the user application to setup the SysTick |
mbed_official | 87:085cde657901 | 17 | * timer or configure other parameters. |
mbed_official | 87:085cde657901 | 18 | * |
mbed_official | 87:085cde657901 | 19 | * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must |
mbed_official | 87:085cde657901 | 20 | * be called whenever the core clock is changed |
mbed_official | 87:085cde657901 | 21 | * during program execution. |
mbed_official | 87:085cde657901 | 22 | * |
mbed_official | 87:085cde657901 | 23 | * |
mbed_official | 87:085cde657901 | 24 | ****************************************************************************** |
mbed_official | 87:085cde657901 | 25 | * @attention |
mbed_official | 87:085cde657901 | 26 | * |
mbed_official | 87:085cde657901 | 27 | * <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2> |
mbed_official | 87:085cde657901 | 28 | * |
mbed_official | 106:ced8cbb51063 | 29 | * Redistribution and use in source and binary forms, with or without modification, |
mbed_official | 106:ced8cbb51063 | 30 | * are permitted provided that the following conditions are met: |
mbed_official | 106:ced8cbb51063 | 31 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 106:ced8cbb51063 | 32 | * this list of conditions and the following disclaimer. |
mbed_official | 106:ced8cbb51063 | 33 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 106:ced8cbb51063 | 34 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 106:ced8cbb51063 | 35 | * and/or other materials provided with the distribution. |
mbed_official | 106:ced8cbb51063 | 36 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 106:ced8cbb51063 | 37 | * may be used to endorse or promote products derived from this software |
mbed_official | 106:ced8cbb51063 | 38 | * without specific prior written permission. |
mbed_official | 87:085cde657901 | 39 | * |
mbed_official | 106:ced8cbb51063 | 40 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 106:ced8cbb51063 | 41 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 106:ced8cbb51063 | 42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 106:ced8cbb51063 | 43 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 106:ced8cbb51063 | 44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 106:ced8cbb51063 | 45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 106:ced8cbb51063 | 46 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 106:ced8cbb51063 | 47 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 106:ced8cbb51063 | 48 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 106:ced8cbb51063 | 49 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 87:085cde657901 | 50 | * |
mbed_official | 87:085cde657901 | 51 | ****************************************************************************** |
mbed_official | 87:085cde657901 | 52 | */ |
mbed_official | 87:085cde657901 | 53 | |
mbed_official | 87:085cde657901 | 54 | /** @addtogroup CMSIS |
mbed_official | 87:085cde657901 | 55 | * @{ |
mbed_official | 87:085cde657901 | 56 | */ |
mbed_official | 87:085cde657901 | 57 | |
mbed_official | 87:085cde657901 | 58 | /** @addtogroup stm32f4xx_system |
mbed_official | 87:085cde657901 | 59 | * @{ |
mbed_official | 87:085cde657901 | 60 | */ |
mbed_official | 87:085cde657901 | 61 | |
mbed_official | 87:085cde657901 | 62 | /** @addtogroup STM32F4xx_System_Private_Includes |
mbed_official | 87:085cde657901 | 63 | * @{ |
mbed_official | 87:085cde657901 | 64 | */ |
mbed_official | 87:085cde657901 | 65 | |
mbed_official | 87:085cde657901 | 66 | #include "stm32f4xx_hal.h" |
mbed_official | 87:085cde657901 | 67 | |
mbed_official | 87:085cde657901 | 68 | /** |
mbed_official | 87:085cde657901 | 69 | * @} |
mbed_official | 87:085cde657901 | 70 | */ |
mbed_official | 87:085cde657901 | 71 | |
mbed_official | 87:085cde657901 | 72 | /** @addtogroup STM32F4xx_System_Private_TypesDefinitions |
mbed_official | 87:085cde657901 | 73 | * @{ |
mbed_official | 87:085cde657901 | 74 | */ |
mbed_official | 87:085cde657901 | 75 | |
mbed_official | 87:085cde657901 | 76 | /** |
mbed_official | 87:085cde657901 | 77 | * @} |
mbed_official | 87:085cde657901 | 78 | */ |
mbed_official | 87:085cde657901 | 79 | |
mbed_official | 87:085cde657901 | 80 | /** @addtogroup STM32F4xx_System_Private_Defines |
mbed_official | 87:085cde657901 | 81 | * @{ |
mbed_official | 87:085cde657901 | 82 | */ |
mbed_official | 87:085cde657901 | 83 | |
mbed_official | 87:085cde657901 | 84 | /************************* Miscellaneous Configuration ************************/ |
mbed_official | 87:085cde657901 | 85 | |
mbed_official | 87:085cde657901 | 86 | /*!< Uncomment the following line if you need to relocate your vector Table in |
mbed_official | 87:085cde657901 | 87 | Internal SRAM. */ |
mbed_official | 87:085cde657901 | 88 | /* #define VECT_TAB_SRAM */ |
mbed_official | 87:085cde657901 | 89 | #define VECT_TAB_OFFSET 0x00 /*!< Vector Table base offset field. |
mbed_official | 87:085cde657901 | 90 | This value must be a multiple of 0x200. */ |
mbed_official | 87:085cde657901 | 91 | /******************************************************************************/ |
mbed_official | 87:085cde657901 | 92 | |
mbed_official | 87:085cde657901 | 93 | /** |
mbed_official | 87:085cde657901 | 94 | * @} |
mbed_official | 87:085cde657901 | 95 | */ |
mbed_official | 87:085cde657901 | 96 | |
mbed_official | 87:085cde657901 | 97 | /** @addtogroup STM32F4xx_System_Private_Macros |
mbed_official | 87:085cde657901 | 98 | * @{ |
mbed_official | 87:085cde657901 | 99 | */ |
mbed_official | 87:085cde657901 | 100 | |
mbed_official | 87:085cde657901 | 101 | /** |
mbed_official | 87:085cde657901 | 102 | * @} |
mbed_official | 87:085cde657901 | 103 | */ |
mbed_official | 87:085cde657901 | 104 | |
mbed_official | 87:085cde657901 | 105 | /** @addtogroup STM32F4xx_System_Private_Variables |
mbed_official | 87:085cde657901 | 106 | * @{ |
mbed_official | 87:085cde657901 | 107 | */ |
mbed_official | 87:085cde657901 | 108 | /* This variable is updated in three ways: |
mbed_official | 87:085cde657901 | 109 | 1) by calling CMSIS function SystemCoreClockUpdate() |
mbed_official | 87:085cde657901 | 110 | 2) by calling HAL API function HAL_RCC_GetHCLKFreq() |
mbed_official | 87:085cde657901 | 111 | 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency |
mbed_official | 87:085cde657901 | 112 | Note: If you use this function to configure the system clock; then there |
mbed_official | 87:085cde657901 | 113 | is no need to call the 2 first functions listed above, since SystemCoreClock |
mbed_official | 87:085cde657901 | 114 | variable is updated automatically. |
mbed_official | 87:085cde657901 | 115 | */ |
mbed_official | 87:085cde657901 | 116 | uint32_t SystemCoreClock = 16000000; |
mbed_official | 87:085cde657901 | 117 | __I uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; |
mbed_official | 87:085cde657901 | 118 | |
mbed_official | 87:085cde657901 | 119 | /** |
mbed_official | 87:085cde657901 | 120 | * @} |
mbed_official | 87:085cde657901 | 121 | */ |
mbed_official | 87:085cde657901 | 122 | |
mbed_official | 87:085cde657901 | 123 | /** @addtogroup STM32F4xx_System_Private_FunctionPrototypes |
mbed_official | 87:085cde657901 | 124 | * @{ |
mbed_official | 87:085cde657901 | 125 | */ |
mbed_official | 87:085cde657901 | 126 | |
mbed_official | 87:085cde657901 | 127 | /** |
mbed_official | 87:085cde657901 | 128 | * @} |
mbed_official | 87:085cde657901 | 129 | */ |
mbed_official | 87:085cde657901 | 130 | |
mbed_official | 87:085cde657901 | 131 | /** @addtogroup STM32F4xx_System_Private_Functions |
mbed_official | 87:085cde657901 | 132 | * @{ |
mbed_official | 87:085cde657901 | 133 | */ |
mbed_official | 87:085cde657901 | 134 | |
mbed_official | 87:085cde657901 | 135 | /** |
mbed_official | 87:085cde657901 | 136 | * @brief Setup the microcontroller system |
mbed_official | 87:085cde657901 | 137 | * Initialize the FPU setting, vector table location and External memory |
mbed_official | 87:085cde657901 | 138 | * configuration. |
mbed_official | 87:085cde657901 | 139 | * @param None |
mbed_official | 87:085cde657901 | 140 | * @retval None |
mbed_official | 87:085cde657901 | 141 | */ |
mbed_official | 87:085cde657901 | 142 | void SystemInit(void) |
mbed_official | 87:085cde657901 | 143 | { |
mbed_official | 87:085cde657901 | 144 | /* FPU settings ------------------------------------------------------------*/ |
mbed_official | 87:085cde657901 | 145 | #if (__FPU_PRESENT == 1) && (__FPU_USED == 1) |
mbed_official | 87:085cde657901 | 146 | SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */ |
mbed_official | 87:085cde657901 | 147 | #endif |
mbed_official | 87:085cde657901 | 148 | /* Reset the RCC clock configuration to the default reset state ------------*/ |
mbed_official | 87:085cde657901 | 149 | /* Set HSION bit */ |
mbed_official | 87:085cde657901 | 150 | RCC->CR |= (uint32_t)0x00000001; |
mbed_official | 87:085cde657901 | 151 | |
mbed_official | 87:085cde657901 | 152 | /* Reset CFGR register */ |
mbed_official | 87:085cde657901 | 153 | RCC->CFGR = 0x00000000; |
mbed_official | 87:085cde657901 | 154 | |
mbed_official | 87:085cde657901 | 155 | /* Reset HSEON, CSSON and PLLON bits */ |
mbed_official | 87:085cde657901 | 156 | RCC->CR &= (uint32_t)0xFEF6FFFF; |
mbed_official | 87:085cde657901 | 157 | |
mbed_official | 87:085cde657901 | 158 | /* Reset PLLCFGR register */ |
mbed_official | 87:085cde657901 | 159 | RCC->PLLCFGR = 0x24003010; |
mbed_official | 87:085cde657901 | 160 | |
mbed_official | 87:085cde657901 | 161 | /* Reset HSEBYP bit */ |
mbed_official | 87:085cde657901 | 162 | RCC->CR &= (uint32_t)0xFFFBFFFF; |
mbed_official | 87:085cde657901 | 163 | |
mbed_official | 87:085cde657901 | 164 | /* Disable all interrupts */ |
mbed_official | 87:085cde657901 | 165 | RCC->CIR = 0x00000000; |
mbed_official | 87:085cde657901 | 166 | |
mbed_official | 87:085cde657901 | 167 | /* Configure the Vector Table location add offset address ------------------*/ |
mbed_official | 87:085cde657901 | 168 | #ifdef VECT_TAB_SRAM |
mbed_official | 87:085cde657901 | 169 | SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */ |
mbed_official | 87:085cde657901 | 170 | #else |
mbed_official | 87:085cde657901 | 171 | SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */ |
mbed_official | 87:085cde657901 | 172 | #endif |
mbed_official | 87:085cde657901 | 173 | |
mbed_official | 87:085cde657901 | 174 | // [ADDED FOR MBED] |
mbed_official | 87:085cde657901 | 175 | HAL_Init(); |
mbed_official | 87:085cde657901 | 176 | RCC_ClkInitTypeDef RCC_ClkInitStruct; |
mbed_official | 87:085cde657901 | 177 | RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); |
mbed_official | 87:085cde657901 | 178 | RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; |
mbed_official | 87:085cde657901 | 179 | RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 16 MHz |
mbed_official | 87:085cde657901 | 180 | RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 16 MHz |
mbed_official | 87:085cde657901 | 181 | RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // 8 MHz for the SPI |
mbed_official | 87:085cde657901 | 182 | HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0); |
mbed_official | 87:085cde657901 | 183 | } |
mbed_official | 87:085cde657901 | 184 | |
mbed_official | 87:085cde657901 | 185 | // [ADDED FOR MBED] |
mbed_official | 87:085cde657901 | 186 | void SysTick_Handler(void) |
mbed_official | 87:085cde657901 | 187 | { |
mbed_official | 87:085cde657901 | 188 | HAL_IncTick(); |
mbed_official | 87:085cde657901 | 189 | } |
mbed_official | 87:085cde657901 | 190 | |
mbed_official | 87:085cde657901 | 191 | /** |
mbed_official | 87:085cde657901 | 192 | * @brief Update SystemCoreClock variable according to Clock Register Values. |
mbed_official | 87:085cde657901 | 193 | * The SystemCoreClock variable contains the core clock (HCLK), it can |
mbed_official | 87:085cde657901 | 194 | * be used by the user application to setup the SysTick timer or configure |
mbed_official | 87:085cde657901 | 195 | * other parameters. |
mbed_official | 87:085cde657901 | 196 | * |
mbed_official | 87:085cde657901 | 197 | * @note Each time the core clock (HCLK) changes, this function must be called |
mbed_official | 87:085cde657901 | 198 | * to update SystemCoreClock variable value. Otherwise, any configuration |
mbed_official | 87:085cde657901 | 199 | * based on this variable will be incorrect. |
mbed_official | 87:085cde657901 | 200 | * |
mbed_official | 87:085cde657901 | 201 | * @note - The system frequency computed by this function is not the real |
mbed_official | 87:085cde657901 | 202 | * frequency in the chip. It is calculated based on the predefined |
mbed_official | 87:085cde657901 | 203 | * constant and the selected clock source: |
mbed_official | 87:085cde657901 | 204 | * |
mbed_official | 87:085cde657901 | 205 | * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*) |
mbed_official | 87:085cde657901 | 206 | * |
mbed_official | 87:085cde657901 | 207 | * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**) |
mbed_official | 87:085cde657901 | 208 | * |
mbed_official | 87:085cde657901 | 209 | * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) |
mbed_official | 87:085cde657901 | 210 | * or HSI_VALUE(*) multiplied/divided by the PLL factors. |
mbed_official | 87:085cde657901 | 211 | * |
mbed_official | 106:ced8cbb51063 | 212 | * (*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.h file (default value |
mbed_official | 87:085cde657901 | 213 | * 16 MHz) but the real value may vary depending on the variations |
mbed_official | 87:085cde657901 | 214 | * in voltage and temperature. |
mbed_official | 87:085cde657901 | 215 | * |
mbed_official | 106:ced8cbb51063 | 216 | * (**) HSE_VALUE is a constant defined in stm32f4xx_hal_conf.h file (its value |
mbed_official | 106:ced8cbb51063 | 217 | * depends on the application requirements), user has to ensure that HSE_VALUE |
mbed_official | 106:ced8cbb51063 | 218 | * is same as the real frequency of the crystal used. Otherwise, this function |
mbed_official | 106:ced8cbb51063 | 219 | * may have wrong result. |
mbed_official | 87:085cde657901 | 220 | * |
mbed_official | 87:085cde657901 | 221 | * - The result of this function could be not correct when using fractional |
mbed_official | 87:085cde657901 | 222 | * value for HSE crystal. |
mbed_official | 87:085cde657901 | 223 | * |
mbed_official | 87:085cde657901 | 224 | * @param None |
mbed_official | 87:085cde657901 | 225 | * @retval None |
mbed_official | 87:085cde657901 | 226 | */ |
mbed_official | 87:085cde657901 | 227 | void SystemCoreClockUpdate(void) |
mbed_official | 87:085cde657901 | 228 | { |
mbed_official | 87:085cde657901 | 229 | uint32_t tmp = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2; |
mbed_official | 87:085cde657901 | 230 | |
mbed_official | 87:085cde657901 | 231 | /* Get SYSCLK source -------------------------------------------------------*/ |
mbed_official | 87:085cde657901 | 232 | tmp = RCC->CFGR & RCC_CFGR_SWS; |
mbed_official | 87:085cde657901 | 233 | |
mbed_official | 87:085cde657901 | 234 | switch (tmp) |
mbed_official | 87:085cde657901 | 235 | { |
mbed_official | 87:085cde657901 | 236 | case 0x00: /* HSI used as system clock source */ |
mbed_official | 87:085cde657901 | 237 | SystemCoreClock = HSI_VALUE; |
mbed_official | 87:085cde657901 | 238 | break; |
mbed_official | 87:085cde657901 | 239 | case 0x04: /* HSE used as system clock source */ |
mbed_official | 87:085cde657901 | 240 | SystemCoreClock = HSE_VALUE; |
mbed_official | 87:085cde657901 | 241 | break; |
mbed_official | 87:085cde657901 | 242 | case 0x08: /* PLL used as system clock source */ |
mbed_official | 87:085cde657901 | 243 | |
mbed_official | 87:085cde657901 | 244 | /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N |
mbed_official | 87:085cde657901 | 245 | SYSCLK = PLL_VCO / PLL_P |
mbed_official | 87:085cde657901 | 246 | */ |
mbed_official | 87:085cde657901 | 247 | pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22; |
mbed_official | 87:085cde657901 | 248 | pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM; |
mbed_official | 87:085cde657901 | 249 | |
mbed_official | 87:085cde657901 | 250 | if (pllsource != 0) |
mbed_official | 87:085cde657901 | 251 | { |
mbed_official | 87:085cde657901 | 252 | /* HSE used as PLL clock source */ |
mbed_official | 87:085cde657901 | 253 | pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6); |
mbed_official | 87:085cde657901 | 254 | } |
mbed_official | 87:085cde657901 | 255 | else |
mbed_official | 87:085cde657901 | 256 | { |
mbed_official | 87:085cde657901 | 257 | /* HSI used as PLL clock source */ |
mbed_official | 87:085cde657901 | 258 | pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6); |
mbed_official | 87:085cde657901 | 259 | } |
mbed_official | 87:085cde657901 | 260 | |
mbed_official | 87:085cde657901 | 261 | pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >>16) + 1 ) *2; |
mbed_official | 87:085cde657901 | 262 | SystemCoreClock = pllvco/pllp; |
mbed_official | 87:085cde657901 | 263 | break; |
mbed_official | 87:085cde657901 | 264 | default: |
mbed_official | 87:085cde657901 | 265 | SystemCoreClock = HSI_VALUE; |
mbed_official | 87:085cde657901 | 266 | break; |
mbed_official | 87:085cde657901 | 267 | } |
mbed_official | 87:085cde657901 | 268 | /* Compute HCLK frequency --------------------------------------------------*/ |
mbed_official | 87:085cde657901 | 269 | /* Get HCLK prescaler */ |
mbed_official | 87:085cde657901 | 270 | tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)]; |
mbed_official | 87:085cde657901 | 271 | /* HCLK frequency */ |
mbed_official | 87:085cde657901 | 272 | SystemCoreClock >>= tmp; |
mbed_official | 87:085cde657901 | 273 | } |
mbed_official | 87:085cde657901 | 274 | |
mbed_official | 87:085cde657901 | 275 | /** |
mbed_official | 87:085cde657901 | 276 | * @} |
mbed_official | 87:085cde657901 | 277 | */ |
mbed_official | 87:085cde657901 | 278 | |
mbed_official | 87:085cde657901 | 279 | /** |
mbed_official | 87:085cde657901 | 280 | * @} |
mbed_official | 87:085cde657901 | 281 | */ |
mbed_official | 87:085cde657901 | 282 | |
mbed_official | 87:085cde657901 | 283 | /** |
mbed_official | 87:085cde657901 | 284 | * @} |
mbed_official | 87:085cde657901 | 285 | */ |
mbed_official | 87:085cde657901 | 286 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |