mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

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targets/TARGET_STM/TARGET_STM32F1/device/system_stm32f1xx.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
170:19eb464bc2be 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Kojto 170:19eb464bc2be 1 /**
Kojto 170:19eb464bc2be 2 ******************************************************************************
Kojto 170:19eb464bc2be 3 * @file system_stm32f1xx.c
Kojto 170:19eb464bc2be 4 * @author MCD Application Team
Kojto 170:19eb464bc2be 5 * @version V4.2.0
Kojto 170:19eb464bc2be 6 * @date 31-March-2017
Kojto 170:19eb464bc2be 7 * @brief CMSIS Cortex-M3 Device Peripheral Access Layer System Source File.
Kojto 170:19eb464bc2be 8 *
Kojto 170:19eb464bc2be 9 * 1. This file provides two functions and one global variable to be called from
Kojto 170:19eb464bc2be 10 * user application:
Kojto 170:19eb464bc2be 11 * - SystemInit(): Setups the system clock (System clock source, PLL Multiplier
Kojto 170:19eb464bc2be 12 * factors, AHB/APBx prescalers and Flash settings).
Kojto 170:19eb464bc2be 13 * This function is called at startup just after reset and
Kojto 170:19eb464bc2be 14 * before branch to main program. This call is made inside
Kojto 170:19eb464bc2be 15 * the "startup_stm32f1xx_xx.s" file.
Kojto 170:19eb464bc2be 16 *
Kojto 170:19eb464bc2be 17 * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
Kojto 170:19eb464bc2be 18 * by the user application to setup the SysTick
Kojto 170:19eb464bc2be 19 * timer or configure other parameters.
Kojto 170:19eb464bc2be 20 *
Kojto 170:19eb464bc2be 21 * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
Kojto 170:19eb464bc2be 22 * be called whenever the core clock is changed
Kojto 170:19eb464bc2be 23 * during program execution.
Kojto 170:19eb464bc2be 24 *
Kojto 170:19eb464bc2be 25 * 2. After each device reset the HSI (8 MHz) is used as system clock source.
Kojto 170:19eb464bc2be 26 * Then SystemInit() function is called, in "startup_stm32f1xx_xx.s" file, to
Kojto 170:19eb464bc2be 27 * configure the system clock before to branch to main program.
Kojto 170:19eb464bc2be 28 *
Kojto 170:19eb464bc2be 29 * 4. The default value of HSE crystal is set to 8 MHz (or 25 MHz, depending on
Kojto 170:19eb464bc2be 30 * the product used), refer to "HSE_VALUE".
Kojto 170:19eb464bc2be 31 * When HSE is used as system clock source, directly or through PLL, and you
Kojto 170:19eb464bc2be 32 * are using different crystal you have to adapt the HSE value to your own
Kojto 170:19eb464bc2be 33 * configuration.
Kojto 170:19eb464bc2be 34 *
Kojto 170:19eb464bc2be 35 ******************************************************************************
Kojto 170:19eb464bc2be 36 * @attention
Kojto 170:19eb464bc2be 37 *
Kojto 170:19eb464bc2be 38 * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
Kojto 170:19eb464bc2be 39 *
Kojto 170:19eb464bc2be 40 * Redistribution and use in source and binary forms, with or without modification,
Kojto 170:19eb464bc2be 41 * are permitted provided that the following conditions are met:
Kojto 170:19eb464bc2be 42 * 1. Redistributions of source code must retain the above copyright notice,
Kojto 170:19eb464bc2be 43 * this list of conditions and the following disclaimer.
Kojto 170:19eb464bc2be 44 * 2. Redistributions in binary form must reproduce the above copyright notice,
Kojto 170:19eb464bc2be 45 * this list of conditions and the following disclaimer in the documentation
Kojto 170:19eb464bc2be 46 * and/or other materials provided with the distribution.
Kojto 170:19eb464bc2be 47 * 3. Neither the name of STMicroelectronics nor the names of its contributors
Kojto 170:19eb464bc2be 48 * may be used to endorse or promote products derived from this software
Kojto 170:19eb464bc2be 49 * without specific prior written permission.
Kojto 170:19eb464bc2be 50 *
Kojto 170:19eb464bc2be 51 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Kojto 170:19eb464bc2be 52 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Kojto 170:19eb464bc2be 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Kojto 170:19eb464bc2be 54 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
Kojto 170:19eb464bc2be 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
Kojto 170:19eb464bc2be 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
Kojto 170:19eb464bc2be 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
Kojto 170:19eb464bc2be 58 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
Kojto 170:19eb464bc2be 59 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Kojto 170:19eb464bc2be 60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Kojto 170:19eb464bc2be 61 *
Kojto 170:19eb464bc2be 62 ******************************************************************************
Kojto 170:19eb464bc2be 63 */
Kojto 170:19eb464bc2be 64
Kojto 170:19eb464bc2be 65 /** @addtogroup CMSIS
Kojto 170:19eb464bc2be 66 * @{
Kojto 170:19eb464bc2be 67 */
Kojto 170:19eb464bc2be 68
Kojto 170:19eb464bc2be 69 /** @addtogroup stm32f1xx_system
Kojto 170:19eb464bc2be 70 * @{
Kojto 170:19eb464bc2be 71 */
Kojto 170:19eb464bc2be 72
Kojto 170:19eb464bc2be 73 /** @addtogroup STM32F1xx_System_Private_Includes
Kojto 170:19eb464bc2be 74 * @{
Kojto 170:19eb464bc2be 75 */
Kojto 170:19eb464bc2be 76
Kojto 170:19eb464bc2be 77 #include "stm32f1xx.h"
Kojto 170:19eb464bc2be 78
Kojto 170:19eb464bc2be 79
Kojto 170:19eb464bc2be 80 /**
Kojto 170:19eb464bc2be 81 * @}
Kojto 170:19eb464bc2be 82 */
Kojto 170:19eb464bc2be 83
Kojto 170:19eb464bc2be 84 /** @addtogroup STM32F1xx_System_Private_TypesDefinitions
Kojto 170:19eb464bc2be 85 * @{
Kojto 170:19eb464bc2be 86 */
Kojto 170:19eb464bc2be 87
Kojto 170:19eb464bc2be 88 /**
Kojto 170:19eb464bc2be 89 * @}
Kojto 170:19eb464bc2be 90 */
Kojto 170:19eb464bc2be 91
Kojto 170:19eb464bc2be 92 /** @addtogroup STM32F1xx_System_Private_Defines
Kojto 170:19eb464bc2be 93 * @{
Kojto 170:19eb464bc2be 94 */
Kojto 170:19eb464bc2be 95
Kojto 170:19eb464bc2be 96 #if !defined (HSE_VALUE)
Kojto 170:19eb464bc2be 97 #define HSE_VALUE 8000000U /*!< Default value of the External oscillator in Hz.
Kojto 170:19eb464bc2be 98 This value can be provided and adapted by the user application. */
Kojto 170:19eb464bc2be 99 #endif /* HSE_VALUE */
Kojto 170:19eb464bc2be 100
Kojto 170:19eb464bc2be 101 #if !defined (HSI_VALUE)
Kojto 170:19eb464bc2be 102 #define HSI_VALUE 8000000U /*!< Default value of the Internal oscillator in Hz.
Kojto 170:19eb464bc2be 103 This value can be provided and adapted by the user application. */
Kojto 170:19eb464bc2be 104 #endif /* HSI_VALUE */
Kojto 170:19eb464bc2be 105
Kojto 170:19eb464bc2be 106 /*!< Uncomment the following line if you need to use external SRAM */
Kojto 170:19eb464bc2be 107 #if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
Kojto 170:19eb464bc2be 108 /* #define DATA_IN_ExtSRAM */
Kojto 170:19eb464bc2be 109 #endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
Kojto 170:19eb464bc2be 110
Kojto 170:19eb464bc2be 111 /*!< Uncomment the following line if you need to relocate your vector Table in
Kojto 170:19eb464bc2be 112 Internal SRAM. */
Kojto 170:19eb464bc2be 113 /* #define VECT_TAB_SRAM */
Kojto 170:19eb464bc2be 114 #define VECT_TAB_OFFSET 0x00000000U /*!< Vector Table base offset field.
Kojto 170:19eb464bc2be 115 This value must be a multiple of 0x200. */
Kojto 170:19eb464bc2be 116
Kojto 170:19eb464bc2be 117
Kojto 170:19eb464bc2be 118 /**
Kojto 170:19eb464bc2be 119 * @}
Kojto 170:19eb464bc2be 120 */
Kojto 170:19eb464bc2be 121
Kojto 170:19eb464bc2be 122 /** @addtogroup STM32F1xx_System_Private_Macros
Kojto 170:19eb464bc2be 123 * @{
Kojto 170:19eb464bc2be 124 */
Kojto 170:19eb464bc2be 125
Kojto 170:19eb464bc2be 126 /**
Kojto 170:19eb464bc2be 127 * @}
Kojto 170:19eb464bc2be 128 */
Kojto 170:19eb464bc2be 129
Kojto 170:19eb464bc2be 130 /** @addtogroup STM32F1xx_System_Private_Variables
Kojto 170:19eb464bc2be 131 * @{
Kojto 170:19eb464bc2be 132 */
Kojto 170:19eb464bc2be 133
Kojto 170:19eb464bc2be 134 /*******************************************************************************
Kojto 170:19eb464bc2be 135 * Clock Definitions
Kojto 170:19eb464bc2be 136 *******************************************************************************/
Kojto 170:19eb464bc2be 137 #if defined(STM32F100xB) ||defined(STM32F100xE)
Kojto 170:19eb464bc2be 138 uint32_t SystemCoreClock = 24000000U; /*!< System Clock Frequency (Core Clock) */
Kojto 170:19eb464bc2be 139 #else /*!< HSI Selected as System Clock source */
Kojto 170:19eb464bc2be 140 uint32_t SystemCoreClock = 72000000U; /*!< System Clock Frequency (Core Clock) */
Kojto 170:19eb464bc2be 141 #endif
Kojto 170:19eb464bc2be 142
Kojto 170:19eb464bc2be 143 const uint8_t AHBPrescTable[16U] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
Kojto 170:19eb464bc2be 144 const uint8_t APBPrescTable[8U] = {0, 0, 0, 0, 1, 2, 3, 4};
Kojto 170:19eb464bc2be 145
Kojto 170:19eb464bc2be 146 /**
Kojto 170:19eb464bc2be 147 * @}
Kojto 170:19eb464bc2be 148 */
Kojto 170:19eb464bc2be 149
Kojto 170:19eb464bc2be 150 /** @addtogroup STM32F1xx_System_Private_FunctionPrototypes
Kojto 170:19eb464bc2be 151 * @{
Kojto 170:19eb464bc2be 152 */
Kojto 170:19eb464bc2be 153
Kojto 170:19eb464bc2be 154 #if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
Kojto 170:19eb464bc2be 155 #ifdef DATA_IN_ExtSRAM
Kojto 170:19eb464bc2be 156 static void SystemInit_ExtMemCtl(void);
Kojto 170:19eb464bc2be 157 #endif /* DATA_IN_ExtSRAM */
Kojto 170:19eb464bc2be 158 #endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
Kojto 170:19eb464bc2be 159
Kojto 170:19eb464bc2be 160 /**
Kojto 170:19eb464bc2be 161 * @}
Kojto 170:19eb464bc2be 162 */
Kojto 170:19eb464bc2be 163
Kojto 170:19eb464bc2be 164 /** @addtogroup STM32F1xx_System_Private_Functions
Kojto 170:19eb464bc2be 165 * @{
Kojto 170:19eb464bc2be 166 */
Kojto 170:19eb464bc2be 167
Kojto 170:19eb464bc2be 168 /*+ MBED */
Kojto 170:19eb464bc2be 169 #if 0
Kojto 170:19eb464bc2be 170 /*- MBED */
Kojto 170:19eb464bc2be 171
Kojto 170:19eb464bc2be 172 /**
Kojto 170:19eb464bc2be 173 * @brief Setup the microcontroller system
Kojto 170:19eb464bc2be 174 * Initialize the Embedded Flash Interface, the PLL and update the
Kojto 170:19eb464bc2be 175 * SystemCoreClock variable.
Kojto 170:19eb464bc2be 176 * @note This function should be used only after reset.
Kojto 170:19eb464bc2be 177 * @param None
Kojto 170:19eb464bc2be 178 * @retval None
Kojto 170:19eb464bc2be 179 */
Kojto 170:19eb464bc2be 180 void SystemInit (void)
Kojto 170:19eb464bc2be 181 {
Kojto 170:19eb464bc2be 182 /* Reset the RCC clock configuration to the default reset state(for debug purpose) */
Kojto 170:19eb464bc2be 183 /* Set HSION bit */
Kojto 170:19eb464bc2be 184 RCC->CR |= 0x00000001U;
Kojto 170:19eb464bc2be 185
Kojto 170:19eb464bc2be 186 /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
Kojto 170:19eb464bc2be 187 #if !defined(STM32F105xC) && !defined(STM32F107xC)
Kojto 170:19eb464bc2be 188 RCC->CFGR &= 0xF8FF0000U;
Kojto 170:19eb464bc2be 189 #else
Kojto 170:19eb464bc2be 190 RCC->CFGR &= 0xF0FF0000U;
Kojto 170:19eb464bc2be 191 #endif /* STM32F105xC */
Kojto 170:19eb464bc2be 192
Kojto 170:19eb464bc2be 193 /* Reset HSEON, CSSON and PLLON bits */
Kojto 170:19eb464bc2be 194 RCC->CR &= 0xFEF6FFFFU;
Kojto 170:19eb464bc2be 195
Kojto 170:19eb464bc2be 196 /* Reset HSEBYP bit */
Kojto 170:19eb464bc2be 197 RCC->CR &= 0xFFFBFFFFU;
Kojto 170:19eb464bc2be 198
Kojto 170:19eb464bc2be 199 /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
Kojto 170:19eb464bc2be 200 RCC->CFGR &= 0xFF80FFFFU;
Kojto 170:19eb464bc2be 201
Kojto 170:19eb464bc2be 202 #if defined(STM32F105xC) || defined(STM32F107xC)
Kojto 170:19eb464bc2be 203 /* Reset PLL2ON and PLL3ON bits */
Kojto 170:19eb464bc2be 204 RCC->CR &= 0xEBFFFFFFU;
Kojto 170:19eb464bc2be 205
Kojto 170:19eb464bc2be 206 /* Disable all interrupts and clear pending bits */
Kojto 170:19eb464bc2be 207 RCC->CIR = 0x00FF0000U;
Kojto 170:19eb464bc2be 208
Kojto 170:19eb464bc2be 209 /* Reset CFGR2 register */
Kojto 170:19eb464bc2be 210 RCC->CFGR2 = 0x00000000U;
Kojto 170:19eb464bc2be 211 #elif defined(STM32F100xB) || defined(STM32F100xE)
Kojto 170:19eb464bc2be 212 /* Disable all interrupts and clear pending bits */
Kojto 170:19eb464bc2be 213 RCC->CIR = 0x009F0000U;
Kojto 170:19eb464bc2be 214
Kojto 170:19eb464bc2be 215 /* Reset CFGR2 register */
Kojto 170:19eb464bc2be 216 RCC->CFGR2 = 0x00000000U;
Kojto 170:19eb464bc2be 217 #else
Kojto 170:19eb464bc2be 218 /* Disable all interrupts and clear pending bits */
Kojto 170:19eb464bc2be 219 RCC->CIR = 0x009F0000U;
Kojto 170:19eb464bc2be 220 #endif /* STM32F105xC */
Kojto 170:19eb464bc2be 221
Kojto 170:19eb464bc2be 222 #if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
Kojto 170:19eb464bc2be 223 #ifdef DATA_IN_ExtSRAM
Kojto 170:19eb464bc2be 224 SystemInit_ExtMemCtl();
Kojto 170:19eb464bc2be 225 #endif /* DATA_IN_ExtSRAM */
Kojto 170:19eb464bc2be 226 #endif
Kojto 170:19eb464bc2be 227
Kojto 170:19eb464bc2be 228 #ifdef VECT_TAB_SRAM
Kojto 170:19eb464bc2be 229 SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
Kojto 170:19eb464bc2be 230 #else
Kojto 170:19eb464bc2be 231 SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
Kojto 170:19eb464bc2be 232 #endif
Kojto 170:19eb464bc2be 233
Kojto 170:19eb464bc2be 234 }
Kojto 170:19eb464bc2be 235
Kojto 170:19eb464bc2be 236 /*+ MBED */
Kojto 170:19eb464bc2be 237 #endif
Kojto 170:19eb464bc2be 238 /*- MBED */
Kojto 170:19eb464bc2be 239
Kojto 170:19eb464bc2be 240 /**
Kojto 170:19eb464bc2be 241 * @brief Update SystemCoreClock variable according to Clock Register Values.
Kojto 170:19eb464bc2be 242 * The SystemCoreClock variable contains the core clock (HCLK), it can
Kojto 170:19eb464bc2be 243 * be used by the user application to setup the SysTick timer or configure
Kojto 170:19eb464bc2be 244 * other parameters.
Kojto 170:19eb464bc2be 245 *
Kojto 170:19eb464bc2be 246 * @note Each time the core clock (HCLK) changes, this function must be called
Kojto 170:19eb464bc2be 247 * to update SystemCoreClock variable value. Otherwise, any configuration
Kojto 170:19eb464bc2be 248 * based on this variable will be incorrect.
Kojto 170:19eb464bc2be 249 *
Kojto 170:19eb464bc2be 250 * @note - The system frequency computed by this function is not the real
Kojto 170:19eb464bc2be 251 * frequency in the chip. It is calculated based on the predefined
Kojto 170:19eb464bc2be 252 * constant and the selected clock source:
Kojto 170:19eb464bc2be 253 *
Kojto 170:19eb464bc2be 254 * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
Kojto 170:19eb464bc2be 255 *
Kojto 170:19eb464bc2be 256 * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
Kojto 170:19eb464bc2be 257 *
Kojto 170:19eb464bc2be 258 * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)
Kojto 170:19eb464bc2be 259 * or HSI_VALUE(*) multiplied by the PLL factors.
Kojto 170:19eb464bc2be 260 *
Kojto 170:19eb464bc2be 261 * (*) HSI_VALUE is a constant defined in stm32f1xx.h file (default value
Kojto 170:19eb464bc2be 262 * 8 MHz) but the real value may vary depending on the variations
Kojto 170:19eb464bc2be 263 * in voltage and temperature.
Kojto 170:19eb464bc2be 264 *
Kojto 170:19eb464bc2be 265 * (**) HSE_VALUE is a constant defined in stm32f1xx.h file (default value
Kojto 170:19eb464bc2be 266 * 8 MHz or 25 MHz, depending on the product used), user has to ensure
Kojto 170:19eb464bc2be 267 * that HSE_VALUE is same as the real frequency of the crystal used.
Kojto 170:19eb464bc2be 268 * Otherwise, this function may have wrong result.
Kojto 170:19eb464bc2be 269 *
Kojto 170:19eb464bc2be 270 * - The result of this function could be not correct when using fractional
Kojto 170:19eb464bc2be 271 * value for HSE crystal.
Kojto 170:19eb464bc2be 272 * @param None
Kojto 170:19eb464bc2be 273 * @retval None
Kojto 170:19eb464bc2be 274 */
Kojto 170:19eb464bc2be 275 void SystemCoreClockUpdate (void)
Kojto 170:19eb464bc2be 276 {
Kojto 170:19eb464bc2be 277 uint32_t tmp = 0U, pllmull = 0U, pllsource = 0U;
Kojto 170:19eb464bc2be 278
Kojto 170:19eb464bc2be 279 #if defined(STM32F105xC) || defined(STM32F107xC)
Kojto 170:19eb464bc2be 280 uint32_t prediv1source = 0U, prediv1factor = 0U, prediv2factor = 0U, pll2mull = 0U;
Kojto 170:19eb464bc2be 281 #endif /* STM32F105xC */
Kojto 170:19eb464bc2be 282
Kojto 170:19eb464bc2be 283 #if defined(STM32F100xB) || defined(STM32F100xE)
Kojto 170:19eb464bc2be 284 uint32_t prediv1factor = 0U;
Kojto 170:19eb464bc2be 285 #endif /* STM32F100xB or STM32F100xE */
Kojto 170:19eb464bc2be 286
Kojto 170:19eb464bc2be 287 /* Get SYSCLK source -------------------------------------------------------*/
Kojto 170:19eb464bc2be 288 tmp = RCC->CFGR & RCC_CFGR_SWS;
Kojto 170:19eb464bc2be 289
Kojto 170:19eb464bc2be 290 switch (tmp)
Kojto 170:19eb464bc2be 291 {
Kojto 170:19eb464bc2be 292 case 0x00U: /* HSI used as system clock */
Kojto 170:19eb464bc2be 293 SystemCoreClock = HSI_VALUE;
Kojto 170:19eb464bc2be 294 break;
Kojto 170:19eb464bc2be 295 case 0x04U: /* HSE used as system clock */
Kojto 170:19eb464bc2be 296 SystemCoreClock = HSE_VALUE;
Kojto 170:19eb464bc2be 297 break;
Kojto 170:19eb464bc2be 298 case 0x08U: /* PLL used as system clock */
Kojto 170:19eb464bc2be 299
Kojto 170:19eb464bc2be 300 /* Get PLL clock source and multiplication factor ----------------------*/
Kojto 170:19eb464bc2be 301 pllmull = RCC->CFGR & RCC_CFGR_PLLMULL;
Kojto 170:19eb464bc2be 302 pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
Kojto 170:19eb464bc2be 303
Kojto 170:19eb464bc2be 304 #if !defined(STM32F105xC) && !defined(STM32F107xC)
Kojto 170:19eb464bc2be 305 pllmull = ( pllmull >> 18U) + 2U;
Kojto 170:19eb464bc2be 306
Kojto 170:19eb464bc2be 307 if (pllsource == 0x00U)
Kojto 170:19eb464bc2be 308 {
Kojto 170:19eb464bc2be 309 /* HSI oscillator clock divided by 2 selected as PLL clock entry */
Kojto 170:19eb464bc2be 310 SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
Kojto 170:19eb464bc2be 311 }
Kojto 170:19eb464bc2be 312 else
Kojto 170:19eb464bc2be 313 {
Kojto 170:19eb464bc2be 314 #if defined(STM32F100xB) || defined(STM32F100xE)
Kojto 170:19eb464bc2be 315 prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
Kojto 170:19eb464bc2be 316 /* HSE oscillator clock selected as PREDIV1 clock entry */
Kojto 170:19eb464bc2be 317 SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull;
Kojto 170:19eb464bc2be 318 #else
Kojto 170:19eb464bc2be 319 /* HSE selected as PLL clock entry */
Kojto 170:19eb464bc2be 320 if ((RCC->CFGR & RCC_CFGR_PLLXTPRE) != (uint32_t)RESET)
Kojto 170:19eb464bc2be 321 {/* HSE oscillator clock divided by 2 */
Kojto 170:19eb464bc2be 322 SystemCoreClock = (HSE_VALUE >> 1U) * pllmull;
Kojto 170:19eb464bc2be 323 }
Kojto 170:19eb464bc2be 324 else
Kojto 170:19eb464bc2be 325 {
Kojto 170:19eb464bc2be 326 SystemCoreClock = HSE_VALUE * pllmull;
Kojto 170:19eb464bc2be 327 }
Kojto 170:19eb464bc2be 328 #endif
Kojto 170:19eb464bc2be 329 }
Kojto 170:19eb464bc2be 330 #else
Kojto 170:19eb464bc2be 331 pllmull = pllmull >> 18U;
Kojto 170:19eb464bc2be 332
Kojto 170:19eb464bc2be 333 if (pllmull != 0x0DU)
Kojto 170:19eb464bc2be 334 {
Kojto 170:19eb464bc2be 335 pllmull += 2U;
Kojto 170:19eb464bc2be 336 }
Kojto 170:19eb464bc2be 337 else
Kojto 170:19eb464bc2be 338 { /* PLL multiplication factor = PLL input clock * 6.5 */
Kojto 170:19eb464bc2be 339 pllmull = 13U / 2U;
Kojto 170:19eb464bc2be 340 }
Kojto 170:19eb464bc2be 341
Kojto 170:19eb464bc2be 342 if (pllsource == 0x00U)
Kojto 170:19eb464bc2be 343 {
Kojto 170:19eb464bc2be 344 /* HSI oscillator clock divided by 2 selected as PLL clock entry */
Kojto 170:19eb464bc2be 345 SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
Kojto 170:19eb464bc2be 346 }
Kojto 170:19eb464bc2be 347 else
Kojto 170:19eb464bc2be 348 {/* PREDIV1 selected as PLL clock entry */
Kojto 170:19eb464bc2be 349
Kojto 170:19eb464bc2be 350 /* Get PREDIV1 clock source and division factor */
Kojto 170:19eb464bc2be 351 prediv1source = RCC->CFGR2 & RCC_CFGR2_PREDIV1SRC;
Kojto 170:19eb464bc2be 352 prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
Kojto 170:19eb464bc2be 353
Kojto 170:19eb464bc2be 354 if (prediv1source == 0U)
Kojto 170:19eb464bc2be 355 {
Kojto 170:19eb464bc2be 356 /* HSE oscillator clock selected as PREDIV1 clock entry */
Kojto 170:19eb464bc2be 357 SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull;
Kojto 170:19eb464bc2be 358 }
Kojto 170:19eb464bc2be 359 else
Kojto 170:19eb464bc2be 360 {/* PLL2 clock selected as PREDIV1 clock entry */
Kojto 170:19eb464bc2be 361
Kojto 170:19eb464bc2be 362 /* Get PREDIV2 division factor and PLL2 multiplication factor */
Kojto 170:19eb464bc2be 363 prediv2factor = ((RCC->CFGR2 & RCC_CFGR2_PREDIV2) >> 4U) + 1U;
Kojto 170:19eb464bc2be 364 pll2mull = ((RCC->CFGR2 & RCC_CFGR2_PLL2MUL) >> 8U) + 2U;
Kojto 170:19eb464bc2be 365 SystemCoreClock = (((HSE_VALUE / prediv2factor) * pll2mull) / prediv1factor) * pllmull;
Kojto 170:19eb464bc2be 366 }
Kojto 170:19eb464bc2be 367 }
Kojto 170:19eb464bc2be 368 #endif /* STM32F105xC */
Kojto 170:19eb464bc2be 369 break;
Kojto 170:19eb464bc2be 370
Kojto 170:19eb464bc2be 371 default:
Kojto 170:19eb464bc2be 372 SystemCoreClock = HSI_VALUE;
Kojto 170:19eb464bc2be 373 break;
Kojto 170:19eb464bc2be 374 }
Kojto 170:19eb464bc2be 375
Kojto 170:19eb464bc2be 376 /* Compute HCLK clock frequency ----------------*/
Kojto 170:19eb464bc2be 377 /* Get HCLK prescaler */
Kojto 170:19eb464bc2be 378 tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4U)];
Kojto 170:19eb464bc2be 379 /* HCLK clock frequency */
Kojto 170:19eb464bc2be 380 SystemCoreClock >>= tmp;
Kojto 170:19eb464bc2be 381 }
Kojto 170:19eb464bc2be 382
Kojto 170:19eb464bc2be 383 #if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
Kojto 170:19eb464bc2be 384 /**
Kojto 170:19eb464bc2be 385 * @brief Setup the external memory controller. Called in startup_stm32f1xx.s
Kojto 170:19eb464bc2be 386 * before jump to __main
Kojto 170:19eb464bc2be 387 * @param None
Kojto 170:19eb464bc2be 388 * @retval None
Kojto 170:19eb464bc2be 389 */
Kojto 170:19eb464bc2be 390 #ifdef DATA_IN_ExtSRAM
Kojto 170:19eb464bc2be 391 /**
Kojto 170:19eb464bc2be 392 * @brief Setup the external memory controller.
Kojto 170:19eb464bc2be 393 * Called in startup_stm32f1xx_xx.s/.c before jump to main.
Kojto 170:19eb464bc2be 394 * This function configures the external SRAM mounted on STM3210E-EVAL
Kojto 170:19eb464bc2be 395 * board (STM32 High density devices). This SRAM will be used as program
Kojto 170:19eb464bc2be 396 * data memory (including heap and stack).
Kojto 170:19eb464bc2be 397 * @param None
Kojto 170:19eb464bc2be 398 * @retval None
Kojto 170:19eb464bc2be 399 */
Kojto 170:19eb464bc2be 400 void SystemInit_ExtMemCtl(void)
Kojto 170:19eb464bc2be 401 {
Kojto 170:19eb464bc2be 402 __IO uint32_t tmpreg;
Kojto 170:19eb464bc2be 403 /*!< FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is
Kojto 170:19eb464bc2be 404 required, then adjust the Register Addresses */
Kojto 170:19eb464bc2be 405
Kojto 170:19eb464bc2be 406 /* Enable FSMC clock */
Kojto 170:19eb464bc2be 407 RCC->AHBENR = 0x00000114U;
Kojto 170:19eb464bc2be 408
Kojto 170:19eb464bc2be 409 /* Delay after an RCC peripheral clock enabling */
Kojto 170:19eb464bc2be 410 tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_FSMCEN);
Kojto 170:19eb464bc2be 411
Kojto 170:19eb464bc2be 412 /* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */
Kojto 170:19eb464bc2be 413 RCC->APB2ENR = 0x000001E0U;
Kojto 170:19eb464bc2be 414
Kojto 170:19eb464bc2be 415 /* Delay after an RCC peripheral clock enabling */
Kojto 170:19eb464bc2be 416 tmpreg = READ_BIT(RCC->APB2ENR, RCC_APB2ENR_IOPDEN);
Kojto 170:19eb464bc2be 417
Kojto 170:19eb464bc2be 418 (void)(tmpreg);
Kojto 170:19eb464bc2be 419
Kojto 170:19eb464bc2be 420 /* --------------- SRAM Data lines, NOE and NWE configuration ---------------*/
Kojto 170:19eb464bc2be 421 /*---------------- SRAM Address lines configuration -------------------------*/
Kojto 170:19eb464bc2be 422 /*---------------- NOE and NWE configuration --------------------------------*/
Kojto 170:19eb464bc2be 423 /*---------------- NE3 configuration ----------------------------------------*/
Kojto 170:19eb464bc2be 424 /*---------------- NBL0, NBL1 configuration ---------------------------------*/
Kojto 170:19eb464bc2be 425
Kojto 170:19eb464bc2be 426 GPIOD->CRL = 0x44BB44BBU;
Kojto 170:19eb464bc2be 427 GPIOD->CRH = 0xBBBBBBBBU;
Kojto 170:19eb464bc2be 428
Kojto 170:19eb464bc2be 429 GPIOE->CRL = 0xB44444BBU;
Kojto 170:19eb464bc2be 430 GPIOE->CRH = 0xBBBBBBBBU;
Kojto 170:19eb464bc2be 431
Kojto 170:19eb464bc2be 432 GPIOF->CRL = 0x44BBBBBBU;
Kojto 170:19eb464bc2be 433 GPIOF->CRH = 0xBBBB4444U;
Kojto 170:19eb464bc2be 434
Kojto 170:19eb464bc2be 435 GPIOG->CRL = 0x44BBBBBBU;
Kojto 170:19eb464bc2be 436 GPIOG->CRH = 0x444B4B44U;
Kojto 170:19eb464bc2be 437
Kojto 170:19eb464bc2be 438 /*---------------- FSMC Configuration ---------------------------------------*/
Kojto 170:19eb464bc2be 439 /*---------------- Enable FSMC Bank1_SRAM Bank ------------------------------*/
Kojto 170:19eb464bc2be 440
Kojto 170:19eb464bc2be 441 FSMC_Bank1->BTCR[4U] = 0x00001091U;
Kojto 170:19eb464bc2be 442 FSMC_Bank1->BTCR[5U] = 0x00110212U;
Kojto 170:19eb464bc2be 443 }
Kojto 170:19eb464bc2be 444 #endif /* DATA_IN_ExtSRAM */
Kojto 170:19eb464bc2be 445 #endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
Kojto 170:19eb464bc2be 446
Kojto 170:19eb464bc2be 447 /**
Kojto 170:19eb464bc2be 448 * @}
Kojto 170:19eb464bc2be 449 */
Kojto 170:19eb464bc2be 450
Kojto 170:19eb464bc2be 451 /**
Kojto 170:19eb464bc2be 452 * @}
Kojto 170:19eb464bc2be 453 */
Kojto 170:19eb464bc2be 454
Kojto 170:19eb464bc2be 455 /**
Kojto 170:19eb464bc2be 456 * @}
Kojto 170:19eb464bc2be 457 */
Kojto 170:19eb464bc2be 458 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/