Mercurial > public > ostc4
annotate Small_CPU/Src/system_stm32f4xx.c @ 677:1953cd9145b3 Betatest
Move include file to common to ...
... get things compiled. The configuration.h file is also used from the RTE
code, so it should be in the Common tree.
Signed-off-by: Jan Mulder <jan@jlmulder.nl>
| author | Jan Mulder <jan@jlmulder.nl> |
|---|---|
| date | Wed, 20 Apr 2022 20:25:04 +0200 |
| 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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f35e53ef04e0
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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****/ |