Pedro Correia / mbed-dev

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F0/device/system_stm32f0xx.c@170:19eb464bc2be, 2017-08-03 (annotated)

Committer:
Kojto
Date:
Thu Aug 03 13:13:39 2017 +0100
Revision:
170:19eb464bc2be
Child:
180:96ed750bd169
This updates the lib to the mbed lib v 148

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_stm32f0xx.c
Kojto 170:19eb464bc2be 4 * @author MCD Application Team
Kojto 170:19eb464bc2be 5 * @version V2.3.1
Kojto 170:19eb464bc2be 6 * @date 04-November-2016
Kojto 170:19eb464bc2be 7 * @brief CMSIS Cortex-M0 Device Peripheral Access Layer System Source File.
Kojto 170:19eb464bc2be 8 *
Kojto 170:19eb464bc2be 9 * This file provides two functions and one global variable to be called from
Kojto 170:19eb464bc2be 10 * user application:
Kojto 170:19eb464bc2be 11 * - SystemInit(): This function is called at startup just after reset and
Kojto 170:19eb464bc2be 12 * before branch to main program. This call is made inside
Kojto 170:19eb464bc2be 13 * the "startup_stm32f0xx.s" file.
Kojto 170:19eb464bc2be 14 *
Kojto 170:19eb464bc2be 15 * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
Kojto 170:19eb464bc2be 16 * by the user application to setup the SysTick
Kojto 170:19eb464bc2be 17 * timer or configure other parameters.
Kojto 170:19eb464bc2be 18 *
Kojto 170:19eb464bc2be 19 * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
Kojto 170:19eb464bc2be 20 * be called whenever the core clock is changed
Kojto 170:19eb464bc2be 21 * during program execution.
Kojto 170:19eb464bc2be 22 *
Kojto 170:19eb464bc2be 23 ******************************************************************************
Kojto 170:19eb464bc2be 24 * @attention
Kojto 170:19eb464bc2be 25 *
Kojto 170:19eb464bc2be 26 * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
Kojto 170:19eb464bc2be 27 *
Kojto 170:19eb464bc2be 28 * Redistribution and use in source and binary forms, with or without modification,
Kojto 170:19eb464bc2be 29 * are permitted provided that the following conditions are met:
Kojto 170:19eb464bc2be 30 * 1. Redistributions of source code must retain the above copyright notice,
Kojto 170:19eb464bc2be 31 * this list of conditions and the following disclaimer.
Kojto 170:19eb464bc2be 32 * 2. Redistributions in binary form must reproduce the above copyright notice,
Kojto 170:19eb464bc2be 33 * this list of conditions and the following disclaimer in the documentation
Kojto 170:19eb464bc2be 34 * and/or other materials provided with the distribution.
Kojto 170:19eb464bc2be 35 * 3. Neither the name of STMicroelectronics nor the names of its contributors
Kojto 170:19eb464bc2be 36 * may be used to endorse or promote products derived from this software
Kojto 170:19eb464bc2be 37 * without specific prior written permission.
Kojto 170:19eb464bc2be 38 *
Kojto 170:19eb464bc2be 39 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Kojto 170:19eb464bc2be 40 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Kojto 170:19eb464bc2be 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Kojto 170:19eb464bc2be 42 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
Kojto 170:19eb464bc2be 43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
Kojto 170:19eb464bc2be 44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
Kojto 170:19eb464bc2be 45 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
Kojto 170:19eb464bc2be 46 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
Kojto 170:19eb464bc2be 47 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Kojto 170:19eb464bc2be 48 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Kojto 170:19eb464bc2be 49 *
Kojto 170:19eb464bc2be 50 ******************************************************************************
Kojto 170:19eb464bc2be 51 */
Kojto 170:19eb464bc2be 52
Kojto 170:19eb464bc2be 53 /** @addtogroup CMSIS
Kojto 170:19eb464bc2be 54 * @{
Kojto 170:19eb464bc2be 55 */
Kojto 170:19eb464bc2be 56
Kojto 170:19eb464bc2be 57 /** @addtogroup stm32f0xx_system
Kojto 170:19eb464bc2be 58 * @{
Kojto 170:19eb464bc2be 59 */
Kojto 170:19eb464bc2be 60
Kojto 170:19eb464bc2be 61 /** @addtogroup STM32F0xx_System_Private_Includes
Kojto 170:19eb464bc2be 62 * @{
Kojto 170:19eb464bc2be 63 */
Kojto 170:19eb464bc2be 64
Kojto 170:19eb464bc2be 65 #include "stm32f0xx.h"
Kojto 170:19eb464bc2be 66
Kojto 170:19eb464bc2be 67 /**
Kojto 170:19eb464bc2be 68 * @}
Kojto 170:19eb464bc2be 69 */
Kojto 170:19eb464bc2be 70
Kojto 170:19eb464bc2be 71 /** @addtogroup STM32F0xx_System_Private_TypesDefinitions
Kojto 170:19eb464bc2be 72 * @{
Kojto 170:19eb464bc2be 73 */
Kojto 170:19eb464bc2be 74
Kojto 170:19eb464bc2be 75 /**
Kojto 170:19eb464bc2be 76 * @}
Kojto 170:19eb464bc2be 77 */
Kojto 170:19eb464bc2be 78
Kojto 170:19eb464bc2be 79 /** @addtogroup STM32F0xx_System_Private_Defines
Kojto 170:19eb464bc2be 80 * @{
Kojto 170:19eb464bc2be 81 */
Kojto 170:19eb464bc2be 82 #if !defined (HSE_VALUE)
Kojto 170:19eb464bc2be 83 #define HSE_VALUE ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz.
Kojto 170:19eb464bc2be 84 This value can be provided and adapted by the user application. */
Kojto 170:19eb464bc2be 85 #endif /* HSE_VALUE */
Kojto 170:19eb464bc2be 86
Kojto 170:19eb464bc2be 87 #if !defined (HSI_VALUE)
Kojto 170:19eb464bc2be 88 #define HSI_VALUE ((uint32_t)8000000) /*!< Default value of the Internal oscillator in Hz.
Kojto 170:19eb464bc2be 89 This value can be provided and adapted by the user application. */
Kojto 170:19eb464bc2be 90 #endif /* HSI_VALUE */
Kojto 170:19eb464bc2be 91
Kojto 170:19eb464bc2be 92 #if !defined (HSI48_VALUE)
Kojto 170:19eb464bc2be 93 #define HSI48_VALUE ((uint32_t)48000000) /*!< Default value of the HSI48 Internal oscillator in Hz.
Kojto 170:19eb464bc2be 94 This value can be provided and adapted by the user application. */
Kojto 170:19eb464bc2be 95 #endif /* HSI48_VALUE */
Kojto 170:19eb464bc2be 96 /**
Kojto 170:19eb464bc2be 97 * @}
Kojto 170:19eb464bc2be 98 */
Kojto 170:19eb464bc2be 99
Kojto 170:19eb464bc2be 100 /** @addtogroup STM32F0xx_System_Private_Macros
Kojto 170:19eb464bc2be 101 * @{
Kojto 170:19eb464bc2be 102 */
Kojto 170:19eb464bc2be 103
Kojto 170:19eb464bc2be 104 /**
Kojto 170:19eb464bc2be 105 * @}
Kojto 170:19eb464bc2be 106 */
Kojto 170:19eb464bc2be 107
Kojto 170:19eb464bc2be 108 /** @addtogroup STM32F0xx_System_Private_Variables
Kojto 170:19eb464bc2be 109 * @{
Kojto 170:19eb464bc2be 110 */
Kojto 170:19eb464bc2be 111 /* This variable is updated in three ways:
Kojto 170:19eb464bc2be 112 1) by calling CMSIS function SystemCoreClockUpdate()
Kojto 170:19eb464bc2be 113 2) by calling HAL API function HAL_RCC_GetHCLKFreq()
Kojto 170:19eb464bc2be 114 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
Kojto 170:19eb464bc2be 115 Note: If you use this function to configure the system clock there is no need to
Kojto 170:19eb464bc2be 116 call the 2 first functions listed above, since SystemCoreClock variable is
Kojto 170:19eb464bc2be 117 updated automatically.
Kojto 170:19eb464bc2be 118 */
Kojto 170:19eb464bc2be 119 uint32_t SystemCoreClock = 8000000;
Kojto 170:19eb464bc2be 120
Kojto 170:19eb464bc2be 121 const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
Kojto 170:19eb464bc2be 122 const uint8_t APBPrescTable[8] = {0, 0, 0, 0, 1, 2, 3, 4};
Kojto 170:19eb464bc2be 123
Kojto 170:19eb464bc2be 124 /**
Kojto 170:19eb464bc2be 125 * @}
Kojto 170:19eb464bc2be 126 */
Kojto 170:19eb464bc2be 127
Kojto 170:19eb464bc2be 128 /** @addtogroup STM32F0xx_System_Private_FunctionPrototypes
Kojto 170:19eb464bc2be 129 * @{
Kojto 170:19eb464bc2be 130 */
Kojto 170:19eb464bc2be 131
Kojto 170:19eb464bc2be 132 /**
Kojto 170:19eb464bc2be 133 * @}
Kojto 170:19eb464bc2be 134 */
Kojto 170:19eb464bc2be 135
Kojto 170:19eb464bc2be 136 /** @addtogroup STM32F0xx_System_Private_Functions
Kojto 170:19eb464bc2be 137 * @{
Kojto 170:19eb464bc2be 138 */
Kojto 170:19eb464bc2be 139
Kojto 170:19eb464bc2be 140 /*+ MBED */
Kojto 170:19eb464bc2be 141 #if 0
Kojto 170:19eb464bc2be 142 /*- MBED */
Kojto 170:19eb464bc2be 143
Kojto 170:19eb464bc2be 144 /**
Kojto 170:19eb464bc2be 145 * @brief Setup the microcontroller system.
Kojto 170:19eb464bc2be 146 * Initialize the default HSI clock source, vector table location and the PLL configuration is reset.
Kojto 170:19eb464bc2be 147 * @param None
Kojto 170:19eb464bc2be 148 * @retval None
Kojto 170:19eb464bc2be 149 */
Kojto 170:19eb464bc2be 150 void SystemInit(void)
Kojto 170:19eb464bc2be 151 {
Kojto 170:19eb464bc2be 152 /* Reset the RCC clock configuration to the default reset state ------------*/
Kojto 170:19eb464bc2be 153 /* Set HSION bit */
Kojto 170:19eb464bc2be 154 RCC->CR |= (uint32_t)0x00000001U;
Kojto 170:19eb464bc2be 155
Kojto 170:19eb464bc2be 156 #if defined (STM32F051x8) || defined (STM32F058x8)
Kojto 170:19eb464bc2be 157 /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE and MCOSEL[2:0] bits */
Kojto 170:19eb464bc2be 158 RCC->CFGR &= (uint32_t)0xF8FFB80CU;
Kojto 170:19eb464bc2be 159 #else
Kojto 170:19eb464bc2be 160 /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE, MCOSEL[2:0], MCOPRE[2:0] and PLLNODIV bits */
Kojto 170:19eb464bc2be 161 RCC->CFGR &= (uint32_t)0x08FFB80CU;
Kojto 170:19eb464bc2be 162 #endif /* STM32F051x8 or STM32F058x8 */
Kojto 170:19eb464bc2be 163
Kojto 170:19eb464bc2be 164 /* Reset HSEON, CSSON and PLLON bits */
Kojto 170:19eb464bc2be 165 RCC->CR &= (uint32_t)0xFEF6FFFFU;
Kojto 170:19eb464bc2be 166
Kojto 170:19eb464bc2be 167 /* Reset HSEBYP bit */
Kojto 170:19eb464bc2be 168 RCC->CR &= (uint32_t)0xFFFBFFFFU;
Kojto 170:19eb464bc2be 169
Kojto 170:19eb464bc2be 170 /* Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */
Kojto 170:19eb464bc2be 171 RCC->CFGR &= (uint32_t)0xFFC0FFFFU;
Kojto 170:19eb464bc2be 172
Kojto 170:19eb464bc2be 173 /* Reset PREDIV[3:0] bits */
Kojto 170:19eb464bc2be 174 RCC->CFGR2 &= (uint32_t)0xFFFFFFF0U;
Kojto 170:19eb464bc2be 175
Kojto 170:19eb464bc2be 176 #if defined (STM32F072xB) || defined (STM32F078xx)
Kojto 170:19eb464bc2be 177 /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */
Kojto 170:19eb464bc2be 178 RCC->CFGR3 &= (uint32_t)0xFFFCFE2CU;
Kojto 170:19eb464bc2be 179 #elif defined (STM32F071xB)
Kojto 170:19eb464bc2be 180 /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
Kojto 170:19eb464bc2be 181 RCC->CFGR3 &= (uint32_t)0xFFFFCEACU;
Kojto 170:19eb464bc2be 182 #elif defined (STM32F091xC) || defined (STM32F098xx)
Kojto 170:19eb464bc2be 183 /* Reset USART3SW[1:0], USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
Kojto 170:19eb464bc2be 184 RCC->CFGR3 &= (uint32_t)0xFFF0FEACU;
Kojto 170:19eb464bc2be 185 #elif defined (STM32F030x6) || defined (STM32F030x8) || defined (STM32F031x6) || defined (STM32F038xx) || defined (STM32F030xC)
Kojto 170:19eb464bc2be 186 /* Reset USART1SW[1:0], I2C1SW and ADCSW bits */
Kojto 170:19eb464bc2be 187 RCC->CFGR3 &= (uint32_t)0xFFFFFEECU;
Kojto 170:19eb464bc2be 188 #elif defined (STM32F051x8) || defined (STM32F058xx)
Kojto 170:19eb464bc2be 189 /* Reset USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
Kojto 170:19eb464bc2be 190 RCC->CFGR3 &= (uint32_t)0xFFFFFEACU;
Kojto 170:19eb464bc2be 191 #elif defined (STM32F042x6) || defined (STM32F048xx)
Kojto 170:19eb464bc2be 192 /* Reset USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */
Kojto 170:19eb464bc2be 193 RCC->CFGR3 &= (uint32_t)0xFFFFFE2CU;
Kojto 170:19eb464bc2be 194 #elif defined (STM32F070x6) || defined (STM32F070xB)
Kojto 170:19eb464bc2be 195 /* Reset USART1SW[1:0], I2C1SW, USBSW and ADCSW bits */
Kojto 170:19eb464bc2be 196 RCC->CFGR3 &= (uint32_t)0xFFFFFE6CU;
Kojto 170:19eb464bc2be 197 /* Set default USB clock to PLLCLK, since there is no HSI48 */
Kojto 170:19eb464bc2be 198 RCC->CFGR3 |= (uint32_t)0x00000080U;
Kojto 170:19eb464bc2be 199 #else
Kojto 170:19eb464bc2be 200 #warning "No target selected"
Kojto 170:19eb464bc2be 201 #endif
Kojto 170:19eb464bc2be 202
Kojto 170:19eb464bc2be 203 /* Reset HSI14 bit */
Kojto 170:19eb464bc2be 204 RCC->CR2 &= (uint32_t)0xFFFFFFFEU;
Kojto 170:19eb464bc2be 205
Kojto 170:19eb464bc2be 206 /* Disable all interrupts */
Kojto 170:19eb464bc2be 207 RCC->CIR = 0x00000000U;
Kojto 170:19eb464bc2be 208
Kojto 170:19eb464bc2be 209 }
Kojto 170:19eb464bc2be 210
Kojto 170:19eb464bc2be 211 /*+ MBED */
Kojto 170:19eb464bc2be 212 #endif
Kojto 170:19eb464bc2be 213 /*- MBED */
Kojto 170:19eb464bc2be 214
Kojto 170:19eb464bc2be 215 /**
Kojto 170:19eb464bc2be 216 * @brief Update SystemCoreClock variable according to Clock Register Values.
Kojto 170:19eb464bc2be 217 * The SystemCoreClock variable contains the core clock (HCLK), it can
Kojto 170:19eb464bc2be 218 * be used by the user application to setup the SysTick timer or configure
Kojto 170:19eb464bc2be 219 * other parameters.
Kojto 170:19eb464bc2be 220 *
Kojto 170:19eb464bc2be 221 * @note Each time the core clock (HCLK) changes, this function must be called
Kojto 170:19eb464bc2be 222 * to update SystemCoreClock variable value. Otherwise, any configuration
Kojto 170:19eb464bc2be 223 * based on this variable will be incorrect.
Kojto 170:19eb464bc2be 224 *
Kojto 170:19eb464bc2be 225 * @note - The system frequency computed by this function is not the real
Kojto 170:19eb464bc2be 226 * frequency in the chip. It is calculated based on the predefined
Kojto 170:19eb464bc2be 227 * constant and the selected clock source:
Kojto 170:19eb464bc2be 228 *
Kojto 170:19eb464bc2be 229 * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
Kojto 170:19eb464bc2be 230 *
Kojto 170:19eb464bc2be 231 * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
Kojto 170:19eb464bc2be 232 *
Kojto 170:19eb464bc2be 233 * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)
Kojto 170:19eb464bc2be 234 * or HSI_VALUE(*) multiplied/divided by the PLL factors.
Kojto 170:19eb464bc2be 235 *
Kojto 170:19eb464bc2be 236 * (*) HSI_VALUE is a constant defined in stm32f0xx_hal.h file (default value
Kojto 170:19eb464bc2be 237 * 8 MHz) but the real value may vary depending on the variations
Kojto 170:19eb464bc2be 238 * in voltage and temperature.
Kojto 170:19eb464bc2be 239 *
Kojto 170:19eb464bc2be 240 * (**) HSE_VALUE is a constant defined in stm32f0xx_hal.h file (default value
Kojto 170:19eb464bc2be 241 * 8 MHz), user has to ensure that HSE_VALUE is same as the real
Kojto 170:19eb464bc2be 242 * frequency of the crystal used. Otherwise, this function may
Kojto 170:19eb464bc2be 243 * have wrong result.
Kojto 170:19eb464bc2be 244 *
Kojto 170:19eb464bc2be 245 * - The result of this function could be not correct when using fractional
Kojto 170:19eb464bc2be 246 * value for HSE crystal.
Kojto 170:19eb464bc2be 247 *
Kojto 170:19eb464bc2be 248 * @param None
Kojto 170:19eb464bc2be 249 * @retval None
Kojto 170:19eb464bc2be 250 */
Kojto 170:19eb464bc2be 251 void SystemCoreClockUpdate (void)
Kojto 170:19eb464bc2be 252 {
Kojto 170:19eb464bc2be 253 uint32_t tmp = 0, pllmull = 0, pllsource = 0, predivfactor = 0;
Kojto 170:19eb464bc2be 254
Kojto 170:19eb464bc2be 255 /* Get SYSCLK source -------------------------------------------------------*/
Kojto 170:19eb464bc2be 256 tmp = RCC->CFGR & RCC_CFGR_SWS;
Kojto 170:19eb464bc2be 257
Kojto 170:19eb464bc2be 258 switch (tmp)
Kojto 170:19eb464bc2be 259 {
Kojto 170:19eb464bc2be 260 case RCC_CFGR_SWS_HSI: /* HSI used as system clock */
Kojto 170:19eb464bc2be 261 SystemCoreClock = HSI_VALUE;
Kojto 170:19eb464bc2be 262 break;
Kojto 170:19eb464bc2be 263 case RCC_CFGR_SWS_HSE: /* HSE used as system clock */
Kojto 170:19eb464bc2be 264 SystemCoreClock = HSE_VALUE;
Kojto 170:19eb464bc2be 265 break;
Kojto 170:19eb464bc2be 266 case RCC_CFGR_SWS_PLL: /* PLL used as system clock */
Kojto 170:19eb464bc2be 267 /* Get PLL clock source and multiplication factor ----------------------*/
Kojto 170:19eb464bc2be 268 pllmull = RCC->CFGR & RCC_CFGR_PLLMUL;
Kojto 170:19eb464bc2be 269 pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
Kojto 170:19eb464bc2be 270 pllmull = ( pllmull >> 18) + 2;
Kojto 170:19eb464bc2be 271 predivfactor = (RCC->CFGR2 & RCC_CFGR2_PREDIV) + 1;
Kojto 170:19eb464bc2be 272
Kojto 170:19eb464bc2be 273 if (pllsource == RCC_CFGR_PLLSRC_HSE_PREDIV)
Kojto 170:19eb464bc2be 274 {
Kojto 170:19eb464bc2be 275 /* HSE used as PLL clock source : SystemCoreClock = HSE/PREDIV * PLLMUL */
Kojto 170:19eb464bc2be 276 SystemCoreClock = (HSE_VALUE/predivfactor) * pllmull;
Kojto 170:19eb464bc2be 277 }
Kojto 170:19eb464bc2be 278 #if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx)
Kojto 170:19eb464bc2be 279 else if (pllsource == RCC_CFGR_PLLSRC_HSI48_PREDIV)
Kojto 170:19eb464bc2be 280 {
Kojto 170:19eb464bc2be 281 /* HSI48 used as PLL clock source : SystemCoreClock = HSI48/PREDIV * PLLMUL */
Kojto 170:19eb464bc2be 282 SystemCoreClock = (HSI48_VALUE/predivfactor) * pllmull;
Kojto 170:19eb464bc2be 283 }
Kojto 170:19eb464bc2be 284 #endif /* STM32F042x6 || STM32F048xx || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */
Kojto 170:19eb464bc2be 285 else
Kojto 170:19eb464bc2be 286 {
Kojto 170:19eb464bc2be 287 #if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F070x6) \
Kojto 170:19eb464bc2be 288 || defined(STM32F078xx) || defined(STM32F071xB) || defined(STM32F072xB) \
Kojto 170:19eb464bc2be 289 || defined(STM32F070xB) || defined(STM32F091xC) || defined(STM32F098xx) || defined(STM32F030xC)
Kojto 170:19eb464bc2be 290 /* HSI used as PLL clock source : SystemCoreClock = HSI/PREDIV * PLLMUL */
Kojto 170:19eb464bc2be 291 SystemCoreClock = (HSI_VALUE/predivfactor) * pllmull;
Kojto 170:19eb464bc2be 292 #else
Kojto 170:19eb464bc2be 293 /* HSI used as PLL clock source : SystemCoreClock = HSI/2 * PLLMUL */
Kojto 170:19eb464bc2be 294 SystemCoreClock = (HSI_VALUE >> 1) * pllmull;
Kojto 170:19eb464bc2be 295 #endif /* STM32F042x6 || STM32F048xx || STM32F070x6 ||
Kojto 170:19eb464bc2be 296 STM32F071xB || STM32F072xB || STM32F078xx || STM32F070xB ||
Kojto 170:19eb464bc2be 297 STM32F091xC || STM32F098xx || STM32F030xC */
Kojto 170:19eb464bc2be 298 }
Kojto 170:19eb464bc2be 299 break;
Kojto 170:19eb464bc2be 300 default: /* HSI used as system clock */
Kojto 170:19eb464bc2be 301 SystemCoreClock = HSI_VALUE;
Kojto 170:19eb464bc2be 302 break;
Kojto 170:19eb464bc2be 303 }
Kojto 170:19eb464bc2be 304 /* Compute HCLK clock frequency ----------------*/
Kojto 170:19eb464bc2be 305 /* Get HCLK prescaler */
Kojto 170:19eb464bc2be 306 tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
Kojto 170:19eb464bc2be 307 /* HCLK clock frequency */
Kojto 170:19eb464bc2be 308 SystemCoreClock >>= tmp;
Kojto 170:19eb464bc2be 309 }
Kojto 170:19eb464bc2be 310
Kojto 170:19eb464bc2be 311 /**
Kojto 170:19eb464bc2be 312 * @}
Kojto 170:19eb464bc2be 313 */
Kojto 170:19eb464bc2be 314
Kojto 170:19eb464bc2be 315 /**
Kojto 170:19eb464bc2be 316 * @}
Kojto 170:19eb464bc2be 317 */
Kojto 170:19eb464bc2be 318
Kojto 170:19eb464bc2be 319 /**
Kojto 170:19eb464bc2be 320 * @}
Kojto 170:19eb464bc2be 321 */
Kojto 170:19eb464bc2be 322
Kojto 170:19eb464bc2be 323 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
Kojto 170:19eb464bc2be 324