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annotate Small_CPU/Src/system_stm32f4xx.c @ 570:701ead8dddab
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| author | Ideenmodellierer |
|---|---|
| date | Mon, 30 Nov 2020 20:55:23 +0100 |
| parents | f35e53ef04e0 |
| children |
| rev | line source |
|---|---|
| 38 | 1 /** |
| 2 ****************************************************************************** | |
| 3 * @file system_stm32f4xx.c | |
| 4 * @author MCD Application Team | |
| 5 * @version V1.1.0 | |
| 6 * @date 26-June-2014 | |
| 7 * @brief CMSIS Cortex-M4 Device Peripheral Access Layer System Source File. | |
| 8 * | |
| 9 * This file provides two functions and one global variable to be called from | |
| 10 * user application: | |
| 11 * - SystemInit(): This function is called at startup just after reset and | |
| 12 * before branch to main program. This call is made inside | |
| 13 * the "startup_stm32f4xx.s" file. | |
| 14 * | |
| 15 * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used | |
| 16 * by the user application to setup the SysTick | |
| 17 * timer or configure other parameters. | |
| 18 * | |
| 19 * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must | |
| 20 * be called whenever the core clock is changed | |
| 21 * during program execution. | |
| 22 * | |
| 23 * | |
| 24 ****************************************************************************** | |
| 25 * @attention | |
| 26 * | |
| 27 * <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2> | |
| 28 * | |
| 29 * Redistribution and use in source and binary forms, with or without modification, | |
| 30 * are permitted provided that the following conditions are met: | |
| 31 * 1. Redistributions of source code must retain the above copyright notice, | |
| 32 * this list of conditions and the following disclaimer. | |
| 33 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 34 * this list of conditions and the following disclaimer in the documentation | |
| 35 * and/or other materials provided with the distribution. | |
| 36 * 3. Neither the name of STMicroelectronics nor the names of its contributors | |
| 37 * may be used to endorse or promote products derived from this software | |
| 38 * without specific prior written permission. | |
| 39 * | |
| 40 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 41 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 43 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
| 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 46 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 47 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| 48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 49 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 50 * | |
| 51 ****************************************************************************** | |
| 52 */ | |
| 53 | |
| 54 /** @addtogroup CMSIS | |
| 55 * @{ | |
| 56 */ | |
| 57 | |
| 58 /** @addtogroup stm32f4xx_system | |
| 59 * @{ | |
| 60 */ | |
| 61 | |
| 62 /** @addtogroup STM32F4xx_System_Private_Includes | |
| 63 * @{ | |
| 64 */ | |
| 65 | |
| 66 #include <stdint.h> | |
| 67 | |
| 68 #include "stm32f4xx_hal.h" | |
| 69 | |
| 70 #if !defined (HSE_VALUE) | |
| 71 #define HSE_VALUE ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz */ | |
| 72 #endif /* HSE_VALUE */ | |
| 73 | |
| 74 #if !defined (HSI_VALUE) | |
| 75 #define HSI_VALUE ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/ | |
| 76 #endif /* HSI_VALUE */ | |
| 77 | |
| 78 /** | |
| 79 * @} | |
| 80 */ | |
| 81 | |
| 82 /** @addtogroup STM32F4xx_System_Private_TypesDefinitions | |
| 83 * @{ | |
| 84 */ | |
| 85 | |
| 86 /** | |
| 87 * @} | |
| 88 */ | |
| 89 | |
| 90 /** @addtogroup STM32F4xx_System_Private_Defines | |
| 91 * @{ | |
| 92 */ | |
| 93 | |
| 94 /************************* Miscellaneous Configuration ************************/ | |
| 95 | |
| 96 /*!< Uncomment the following line if you need to relocate your vector Table in | |
| 97 Internal SRAM. */ | |
| 98 /* #define VECT_TAB_SRAM */ | |
| 99 #define VECT_TAB_OFFSET 0x00 /*!< Vector Table base offset field. | |
| 100 This value must be a multiple of 0x200. */ | |
| 101 /******************************************************************************/ | |
| 102 | |
| 103 /** | |
| 104 * @} | |
| 105 */ | |
| 106 | |
| 107 /** @addtogroup STM32F4xx_System_Private_Macros | |
| 108 * @{ | |
| 109 */ | |
| 110 | |
| 111 /** | |
| 112 * @} | |
| 113 */ | |
| 114 | |
| 115 /** @addtogroup STM32F4xx_System_Private_Variables | |
| 116 * @{ | |
| 117 */ | |
| 118 /* This variable is updated in three ways: | |
| 119 1) by calling CMSIS function SystemCoreClockUpdate() | |
| 120 2) by calling HAL API function HAL_RCC_GetHCLKFreq() | |
| 121 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency | |
| 122 Note: If you use this function to configure the system clock; then there | |
| 123 is no need to call the 2 first functions listed above, since SystemCoreClock | |
| 124 variable is updated automatically. | |
| 125 */ | |
|
131
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126 uint32_t SystemCoreClock = 16000000; |
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127 const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; |
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128 const uint8_t APBPrescTable[8] = {0, 0, 0, 0, 1, 2, 3, 4}; |
| 38 | 129 /** |
| 130 * @} | |
| 131 */ | |
| 132 | |
| 133 /** @addtogroup STM32F4xx_System_Private_FunctionPrototypes | |
| 134 * @{ | |
| 135 */ | |
| 136 | |
| 137 /** | |
| 138 * @} | |
| 139 */ | |
| 140 | |
| 141 /** @addtogroup STM32F4xx_System_Private_Functions | |
| 142 * @{ | |
| 143 */ | |
| 144 | |
| 145 /** | |
| 146 * @brief Setup the microcontroller system | |
| 147 * Initialize the FPU setting, vector table location and External memory | |
| 148 * configuration. | |
| 149 * @param None | |
| 150 * @retval None | |
| 151 */ | |
| 152 void SystemInit(void) | |
| 153 { | |
| 154 /* FPU settings ------------------------------------------------------------*/ | |
| 155 #if (__FPU_PRESENT == 1) && (__FPU_USED == 1) | |
| 156 SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */ | |
| 157 #endif | |
| 158 /* Reset the RCC clock configuration to the default reset state ------------*/ | |
| 159 /* Set HSION bit */ | |
| 160 RCC->CR |= (uint32_t)0x00000001; | |
| 161 | |
| 162 /* Reset CFGR register */ | |
| 163 RCC->CFGR = 0x00000000; | |
| 164 | |
| 165 /* Reset HSEON, CSSON and PLLON bits */ | |
| 166 RCC->CR &= (uint32_t)0xFEF6FFFF; | |
| 167 | |
| 168 /* Reset PLLCFGR register */ | |
| 169 RCC->PLLCFGR = 0x24003010; | |
| 170 | |
| 171 /* Reset HSEBYP bit */ | |
| 172 RCC->CR &= (uint32_t)0xFFFBFFFF; | |
| 173 | |
| 174 /* Disable all interrupts */ | |
| 175 RCC->CIR = 0x00000000; | |
| 176 | |
| 177 /* Configure the Vector Table location add offset address ------------------*/ | |
| 178 #ifdef VECT_TAB_SRAM | |
| 179 SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */ | |
| 180 #else | |
| 181 SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */ | |
| 182 #endif | |
| 183 } | |
| 184 | |
| 185 /** | |
| 186 * @brief Update SystemCoreClock variable according to Clock Register Values. | |
| 187 * The SystemCoreClock variable contains the core clock (HCLK), it can | |
| 188 * be used by the user application to setup the SysTick timer or configure | |
| 189 * other parameters. | |
| 190 * | |
| 191 * @note Each time the core clock (HCLK) changes, this function must be called | |
| 192 * to update SystemCoreClock variable value. Otherwise, any configuration | |
| 193 * based on this variable will be incorrect. | |
| 194 * | |
| 195 * @note - The system frequency computed by this function is not the real | |
| 196 * frequency in the chip. It is calculated based on the predefined | |
| 197 * constant and the selected clock source: | |
| 198 * | |
| 199 * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*) | |
| 200 * | |
| 201 * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**) | |
| 202 * | |
| 203 * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) | |
| 204 * or HSI_VALUE(*) multiplied/divided by the PLL factors. | |
| 205 * | |
| 206 * (*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.h file (default value | |
| 207 * 16 MHz) but the real value may vary depending on the variations | |
| 208 * in voltage and temperature. | |
| 209 * | |
| 210 * (**) HSE_VALUE is a constant defined in stm32f4xx_hal_conf.h file (its value | |
| 211 * depends on the application requirements), user has to ensure that HSE_VALUE | |
| 212 * is same as the real frequency of the crystal used. Otherwise, this function | |
| 213 * may have wrong result. | |
| 214 * | |
| 215 * - The result of this function could be not correct when using fractional | |
| 216 * value for HSE crystal. | |
| 217 * | |
| 218 * @param None | |
| 219 * @retval None | |
| 220 */ | |
| 221 void SystemCoreClockUpdate(void) | |
| 222 { | |
| 223 uint32_t tmp = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2; | |
| 224 | |
| 225 /* Get SYSCLK source -------------------------------------------------------*/ | |
| 226 tmp = RCC->CFGR & RCC_CFGR_SWS; | |
| 227 | |
| 228 switch (tmp) | |
| 229 { | |
| 230 case 0x00: /* HSI used as system clock source */ | |
| 231 SystemCoreClock = HSI_VALUE; | |
| 232 break; | |
| 233 case 0x04: /* HSE used as system clock source */ | |
| 234 SystemCoreClock = HSE_VALUE; | |
| 235 break; | |
| 236 case 0x08: /* PLL used as system clock source */ | |
| 237 | |
| 238 /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N | |
| 239 SYSCLK = PLL_VCO / PLL_P | |
| 240 */ | |
| 241 pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22; | |
| 242 pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM; | |
| 243 | |
| 244 if (pllsource != 0) | |
| 245 { | |
| 246 /* HSE used as PLL clock source */ | |
| 247 pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6); | |
| 248 } | |
| 249 else | |
| 250 { | |
| 251 /* HSI used as PLL clock source */ | |
| 252 pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6); | |
| 253 } | |
| 254 | |
| 255 pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >>16) + 1 ) *2; | |
| 256 SystemCoreClock = pllvco/pllp; | |
| 257 break; | |
| 258 default: | |
| 259 SystemCoreClock = HSI_VALUE; | |
| 260 break; | |
| 261 } | |
| 262 /* Compute HCLK frequency --------------------------------------------------*/ | |
| 263 /* Get HCLK prescaler */ | |
| 264 tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)]; | |
| 265 /* HCLK frequency */ | |
| 266 SystemCoreClock >>= tmp; | |
| 267 } | |
| 268 | |
| 269 /** | |
| 270 * @} | |
| 271 */ | |
| 272 | |
| 273 /** | |
| 274 * @} | |
| 275 */ | |
| 276 | |
| 277 /** | |
| 278 * @} | |
| 279 */ | |
| 280 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |