mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
targets/TARGET_STM/TARGET_STM32F2/device/system_stm32f2xx.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?
User | Revision | Line number | New contents of line |
---|---|---|---|
Kojto | 170:19eb464bc2be | 1 | /** |
Kojto | 170:19eb464bc2be | 2 | ****************************************************************************** |
Kojto | 170:19eb464bc2be | 3 | * @file system_stm32f2xx.c |
Kojto | 170:19eb464bc2be | 4 | * @author MCD Application Team |
Kojto | 170:19eb464bc2be | 5 | * @version V2.2.0 |
Kojto | 170:19eb464bc2be | 6 | * @date 17-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 | * 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_stm32f2xx.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>© COPYRIGHT 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 stm32f2xx_system |
Kojto | 170:19eb464bc2be | 58 | * @{ |
Kojto | 170:19eb464bc2be | 59 | */ |
Kojto | 170:19eb464bc2be | 60 | |
Kojto | 170:19eb464bc2be | 61 | /** @addtogroup STM32F2xx_System_Private_Includes |
Kojto | 170:19eb464bc2be | 62 | * @{ |
Kojto | 170:19eb464bc2be | 63 | */ |
Kojto | 170:19eb464bc2be | 64 | |
Kojto | 170:19eb464bc2be | 65 | #include "stm32f2xx.h" |
Kojto | 170:19eb464bc2be | 66 | |
Kojto | 170:19eb464bc2be | 67 | #if !defined (HSE_VALUE) |
Kojto | 170:19eb464bc2be | 68 | #define HSE_VALUE ((uint32_t)25000000) /*!< Default value of the External oscillator in Hz */ |
Kojto | 170:19eb464bc2be | 69 | #endif /* HSE_VALUE */ |
Kojto | 170:19eb464bc2be | 70 | |
Kojto | 170:19eb464bc2be | 71 | #if !defined (HSI_VALUE) |
Kojto | 170:19eb464bc2be | 72 | #define HSI_VALUE ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/ |
Kojto | 170:19eb464bc2be | 73 | #endif /* HSI_VALUE */ |
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 STM32F2xx_System_Private_TypesDefinitions |
Kojto | 170:19eb464bc2be | 80 | * @{ |
Kojto | 170:19eb464bc2be | 81 | */ |
Kojto | 170:19eb464bc2be | 82 | |
Kojto | 170:19eb464bc2be | 83 | /** |
Kojto | 170:19eb464bc2be | 84 | * @} |
Kojto | 170:19eb464bc2be | 85 | */ |
Kojto | 170:19eb464bc2be | 86 | |
Kojto | 170:19eb464bc2be | 87 | /** @addtogroup STM32F2xx_System_Private_Defines |
Kojto | 170:19eb464bc2be | 88 | * @{ |
Kojto | 170:19eb464bc2be | 89 | */ |
Kojto | 170:19eb464bc2be | 90 | /************************* Miscellaneous Configuration ************************/ |
Kojto | 170:19eb464bc2be | 91 | /*!< Uncomment the following line if you need to use external SRAM mounted |
Kojto | 170:19eb464bc2be | 92 | on STM322xG_EVAL board as data memory */ |
Kojto | 170:19eb464bc2be | 93 | /* #define DATA_IN_ExtSRAM */ |
Kojto | 170:19eb464bc2be | 94 | |
Kojto | 170:19eb464bc2be | 95 | /*!< Uncomment the following line if you need to relocate your vector Table in |
Kojto | 170:19eb464bc2be | 96 | Internal SRAM. */ |
Kojto | 170:19eb464bc2be | 97 | /* #define VECT_TAB_SRAM */ |
Kojto | 170:19eb464bc2be | 98 | #define VECT_TAB_OFFSET 0x00 /*!< Vector Table base offset field. |
Kojto | 170:19eb464bc2be | 99 | This value must be a multiple of 0x200. */ |
Kojto | 170:19eb464bc2be | 100 | /******************************************************************************/ |
Kojto | 170:19eb464bc2be | 101 | |
Kojto | 170:19eb464bc2be | 102 | /** |
Kojto | 170:19eb464bc2be | 103 | * @} |
Kojto | 170:19eb464bc2be | 104 | */ |
Kojto | 170:19eb464bc2be | 105 | |
Kojto | 170:19eb464bc2be | 106 | /** @addtogroup STM32F2xx_System_Private_Macros |
Kojto | 170:19eb464bc2be | 107 | * @{ |
Kojto | 170:19eb464bc2be | 108 | */ |
Kojto | 170:19eb464bc2be | 109 | |
Kojto | 170:19eb464bc2be | 110 | /** |
Kojto | 170:19eb464bc2be | 111 | * @} |
Kojto | 170:19eb464bc2be | 112 | */ |
Kojto | 170:19eb464bc2be | 113 | |
Kojto | 170:19eb464bc2be | 114 | /** @addtogroup STM32F2xx_System_Private_Variables |
Kojto | 170:19eb464bc2be | 115 | * @{ |
Kojto | 170:19eb464bc2be | 116 | */ |
Kojto | 170:19eb464bc2be | 117 | |
Kojto | 170:19eb464bc2be | 118 | /* This variable can be updated in Three ways : |
Kojto | 170:19eb464bc2be | 119 | 1) by calling CMSIS function SystemCoreClockUpdate() |
Kojto | 170:19eb464bc2be | 120 | 2) by calling HAL API function HAL_RCC_GetHCLKFreq() |
Kojto | 170:19eb464bc2be | 121 | 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency |
Kojto | 170:19eb464bc2be | 122 | Note: If you use this function to configure the system clock; then there |
Kojto | 170:19eb464bc2be | 123 | is no need to call the 2 first functions listed above, since SystemCoreClock |
Kojto | 170:19eb464bc2be | 124 | variable is updated automatically. |
Kojto | 170:19eb464bc2be | 125 | */ |
Kojto | 170:19eb464bc2be | 126 | uint32_t SystemCoreClock = 16000000; |
Kojto | 170:19eb464bc2be | 127 | const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; |
Kojto | 170:19eb464bc2be | 128 | const uint8_t APBPrescTable[8] = {0, 0, 0, 0, 1, 2, 3, 4}; |
Kojto | 170:19eb464bc2be | 129 | /** |
Kojto | 170:19eb464bc2be | 130 | * @} |
Kojto | 170:19eb464bc2be | 131 | */ |
Kojto | 170:19eb464bc2be | 132 | |
Kojto | 170:19eb464bc2be | 133 | /** @addtogroup STM32F2xx_System_Private_FunctionPrototypes |
Kojto | 170:19eb464bc2be | 134 | * @{ |
Kojto | 170:19eb464bc2be | 135 | */ |
Kojto | 170:19eb464bc2be | 136 | |
Kojto | 170:19eb464bc2be | 137 | #ifdef DATA_IN_ExtSRAM |
Kojto | 170:19eb464bc2be | 138 | static void SystemInit_ExtMemCtl(void); |
Kojto | 170:19eb464bc2be | 139 | #endif /* DATA_IN_ExtSRAM */ |
Kojto | 170:19eb464bc2be | 140 | |
Kojto | 170:19eb464bc2be | 141 | /** |
Kojto | 170:19eb464bc2be | 142 | * @} |
Kojto | 170:19eb464bc2be | 143 | */ |
Kojto | 170:19eb464bc2be | 144 | |
Kojto | 170:19eb464bc2be | 145 | /** @addtogroup STM32F2xx_System_Private_Functions |
Kojto | 170:19eb464bc2be | 146 | * @{ |
Kojto | 170:19eb464bc2be | 147 | */ |
Kojto | 170:19eb464bc2be | 148 | |
Kojto | 170:19eb464bc2be | 149 | /*+ MBED */ |
Kojto | 170:19eb464bc2be | 150 | #if 0 |
Kojto | 170:19eb464bc2be | 151 | /*- MBED */ |
Kojto | 170:19eb464bc2be | 152 | |
Kojto | 170:19eb464bc2be | 153 | /** |
Kojto | 170:19eb464bc2be | 154 | * @brief Setup the microcontroller system |
Kojto | 170:19eb464bc2be | 155 | * Initialize the Embedded Flash Interface, the PLL and update the |
Kojto | 170:19eb464bc2be | 156 | * SystemFrequency variable. |
Kojto | 170:19eb464bc2be | 157 | * @param None |
Kojto | 170:19eb464bc2be | 158 | * @retval None |
Kojto | 170:19eb464bc2be | 159 | */ |
Kojto | 170:19eb464bc2be | 160 | void SystemInit(void) |
Kojto | 170:19eb464bc2be | 161 | { |
Kojto | 170:19eb464bc2be | 162 | /* Reset the RCC clock configuration to the default reset state ------------*/ |
Kojto | 170:19eb464bc2be | 163 | /* Set HSION bit */ |
Kojto | 170:19eb464bc2be | 164 | RCC->CR |= (uint32_t)0x00000001; |
Kojto | 170:19eb464bc2be | 165 | |
Kojto | 170:19eb464bc2be | 166 | /* Reset CFGR register */ |
Kojto | 170:19eb464bc2be | 167 | RCC->CFGR = 0x00000000; |
Kojto | 170:19eb464bc2be | 168 | |
Kojto | 170:19eb464bc2be | 169 | /* Reset HSEON, CSSON and PLLON bits */ |
Kojto | 170:19eb464bc2be | 170 | RCC->CR &= (uint32_t)0xFEF6FFFF; |
Kojto | 170:19eb464bc2be | 171 | |
Kojto | 170:19eb464bc2be | 172 | /* Reset PLLCFGR register */ |
Kojto | 170:19eb464bc2be | 173 | RCC->PLLCFGR = 0x24003010; |
Kojto | 170:19eb464bc2be | 174 | |
Kojto | 170:19eb464bc2be | 175 | /* Reset HSEBYP bit */ |
Kojto | 170:19eb464bc2be | 176 | RCC->CR &= (uint32_t)0xFFFBFFFF; |
Kojto | 170:19eb464bc2be | 177 | |
Kojto | 170:19eb464bc2be | 178 | /* Disable all interrupts */ |
Kojto | 170:19eb464bc2be | 179 | RCC->CIR = 0x00000000; |
Kojto | 170:19eb464bc2be | 180 | |
Kojto | 170:19eb464bc2be | 181 | #ifdef DATA_IN_ExtSRAM |
Kojto | 170:19eb464bc2be | 182 | SystemInit_ExtMemCtl(); |
Kojto | 170:19eb464bc2be | 183 | #endif /* DATA_IN_ExtSRAM */ |
Kojto | 170:19eb464bc2be | 184 | |
Kojto | 170:19eb464bc2be | 185 | /* Configure the Vector Table location add offset address ------------------*/ |
Kojto | 170:19eb464bc2be | 186 | #ifdef VECT_TAB_SRAM |
Kojto | 170:19eb464bc2be | 187 | SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */ |
Kojto | 170:19eb464bc2be | 188 | #else |
Kojto | 170:19eb464bc2be | 189 | SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */ |
Kojto | 170:19eb464bc2be | 190 | #endif |
Kojto | 170:19eb464bc2be | 191 | } |
Kojto | 170:19eb464bc2be | 192 | |
Kojto | 170:19eb464bc2be | 193 | /*+ MBED */ |
Kojto | 170:19eb464bc2be | 194 | #endif |
Kojto | 170:19eb464bc2be | 195 | /*- MBED */ |
Kojto | 170:19eb464bc2be | 196 | |
Kojto | 170:19eb464bc2be | 197 | /** |
Kojto | 170:19eb464bc2be | 198 | * @brief Update SystemCoreClock variable according to Clock Register Values. |
Kojto | 170:19eb464bc2be | 199 | * The SystemCoreClock variable contains the core clock (HCLK), it can |
Kojto | 170:19eb464bc2be | 200 | * be used by the user application to setup the SysTick timer or configure |
Kojto | 170:19eb464bc2be | 201 | * other parameters. |
Kojto | 170:19eb464bc2be | 202 | * |
Kojto | 170:19eb464bc2be | 203 | * @note Each time the core clock (HCLK) changes, this function must be called |
Kojto | 170:19eb464bc2be | 204 | * to update SystemCoreClock variable value. Otherwise, any configuration |
Kojto | 170:19eb464bc2be | 205 | * based on this variable will be incorrect. |
Kojto | 170:19eb464bc2be | 206 | * |
Kojto | 170:19eb464bc2be | 207 | * @note - The system frequency computed by this function is not the real |
Kojto | 170:19eb464bc2be | 208 | * frequency in the chip. It is calculated based on the predefined |
Kojto | 170:19eb464bc2be | 209 | * constant and the selected clock source: |
Kojto | 170:19eb464bc2be | 210 | * |
Kojto | 170:19eb464bc2be | 211 | * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*) |
Kojto | 170:19eb464bc2be | 212 | * |
Kojto | 170:19eb464bc2be | 213 | * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**) |
Kojto | 170:19eb464bc2be | 214 | * |
Kojto | 170:19eb464bc2be | 215 | * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) |
Kojto | 170:19eb464bc2be | 216 | * or HSI_VALUE(*) multiplied/divided by the PLL factors. |
Kojto | 170:19eb464bc2be | 217 | * |
Kojto | 170:19eb464bc2be | 218 | * (*) HSI_VALUE is a constant defined in stm32f2xx_hal_conf.h file (default value |
Kojto | 170:19eb464bc2be | 219 | * 16 MHz) but the real value may vary depending on the variations |
Kojto | 170:19eb464bc2be | 220 | * in voltage and temperature. |
Kojto | 170:19eb464bc2be | 221 | * |
Kojto | 170:19eb464bc2be | 222 | * (**) HSE_VALUE is a constant defined in stm32f2xx_hal_conf.h file (its value |
Kojto | 170:19eb464bc2be | 223 | * depends on the application requirements), user has to ensure that HSE_VALUE |
Kojto | 170:19eb464bc2be | 224 | * is same as the real frequency of the crystal used. Otherwise, this function |
Kojto | 170:19eb464bc2be | 225 | * may have wrong result. |
Kojto | 170:19eb464bc2be | 226 | * |
Kojto | 170:19eb464bc2be | 227 | * - The result of this function could be not correct when using fractional |
Kojto | 170:19eb464bc2be | 228 | * value for HSE crystal. |
Kojto | 170:19eb464bc2be | 229 | * |
Kojto | 170:19eb464bc2be | 230 | * @param None |
Kojto | 170:19eb464bc2be | 231 | * @retval None |
Kojto | 170:19eb464bc2be | 232 | */ |
Kojto | 170:19eb464bc2be | 233 | void SystemCoreClockUpdate(void) |
Kojto | 170:19eb464bc2be | 234 | { |
Kojto | 170:19eb464bc2be | 235 | uint32_t tmp = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2; |
Kojto | 170:19eb464bc2be | 236 | |
Kojto | 170:19eb464bc2be | 237 | /* Get SYSCLK source -------------------------------------------------------*/ |
Kojto | 170:19eb464bc2be | 238 | tmp = RCC->CFGR & RCC_CFGR_SWS; |
Kojto | 170:19eb464bc2be | 239 | |
Kojto | 170:19eb464bc2be | 240 | switch (tmp) |
Kojto | 170:19eb464bc2be | 241 | { |
Kojto | 170:19eb464bc2be | 242 | case 0x00: /* HSI used as system clock source */ |
Kojto | 170:19eb464bc2be | 243 | SystemCoreClock = HSI_VALUE; |
Kojto | 170:19eb464bc2be | 244 | break; |
Kojto | 170:19eb464bc2be | 245 | case 0x04: /* HSE used as system clock source */ |
Kojto | 170:19eb464bc2be | 246 | SystemCoreClock = HSE_VALUE; |
Kojto | 170:19eb464bc2be | 247 | break; |
Kojto | 170:19eb464bc2be | 248 | case 0x08: /* PLL used as system clock source */ |
Kojto | 170:19eb464bc2be | 249 | |
Kojto | 170:19eb464bc2be | 250 | /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N |
Kojto | 170:19eb464bc2be | 251 | SYSCLK = PLL_VCO / PLL_P |
Kojto | 170:19eb464bc2be | 252 | */ |
Kojto | 170:19eb464bc2be | 253 | pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22; |
Kojto | 170:19eb464bc2be | 254 | pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM; |
Kojto | 170:19eb464bc2be | 255 | |
Kojto | 170:19eb464bc2be | 256 | if (pllsource != 0) |
Kojto | 170:19eb464bc2be | 257 | { |
Kojto | 170:19eb464bc2be | 258 | /* HSE used as PLL clock source */ |
Kojto | 170:19eb464bc2be | 259 | pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6); |
Kojto | 170:19eb464bc2be | 260 | } |
Kojto | 170:19eb464bc2be | 261 | else |
Kojto | 170:19eb464bc2be | 262 | { |
Kojto | 170:19eb464bc2be | 263 | /* HSI used as PLL clock source */ |
Kojto | 170:19eb464bc2be | 264 | pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6); |
Kojto | 170:19eb464bc2be | 265 | } |
Kojto | 170:19eb464bc2be | 266 | |
Kojto | 170:19eb464bc2be | 267 | pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >>16) + 1 ) *2; |
Kojto | 170:19eb464bc2be | 268 | SystemCoreClock = pllvco/pllp; |
Kojto | 170:19eb464bc2be | 269 | break; |
Kojto | 170:19eb464bc2be | 270 | default: |
Kojto | 170:19eb464bc2be | 271 | SystemCoreClock = HSI_VALUE; |
Kojto | 170:19eb464bc2be | 272 | break; |
Kojto | 170:19eb464bc2be | 273 | } |
Kojto | 170:19eb464bc2be | 274 | /* Compute HCLK frequency --------------------------------------------------*/ |
Kojto | 170:19eb464bc2be | 275 | /* Get HCLK prescaler */ |
Kojto | 170:19eb464bc2be | 276 | tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)]; |
Kojto | 170:19eb464bc2be | 277 | /* HCLK frequency */ |
Kojto | 170:19eb464bc2be | 278 | SystemCoreClock >>= tmp; |
Kojto | 170:19eb464bc2be | 279 | } |
Kojto | 170:19eb464bc2be | 280 | |
Kojto | 170:19eb464bc2be | 281 | #ifdef DATA_IN_ExtSRAM |
Kojto | 170:19eb464bc2be | 282 | /** |
Kojto | 170:19eb464bc2be | 283 | * @brief Setup the external memory controller. |
Kojto | 170:19eb464bc2be | 284 | * Called in startup_stm32f2xx.s before jump to main. |
Kojto | 170:19eb464bc2be | 285 | * This function configures the external SRAM mounted on STM322xG_EVAL board |
Kojto | 170:19eb464bc2be | 286 | * This SRAM will be used as program data memory (including heap and stack). |
Kojto | 170:19eb464bc2be | 287 | * @param None |
Kojto | 170:19eb464bc2be | 288 | * @retval None |
Kojto | 170:19eb464bc2be | 289 | */ |
Kojto | 170:19eb464bc2be | 290 | void SystemInit_ExtMemCtl(void) |
Kojto | 170:19eb464bc2be | 291 | { |
Kojto | 170:19eb464bc2be | 292 | __IO uint32_t tmp = 0x00; |
Kojto | 170:19eb464bc2be | 293 | |
Kojto | 170:19eb464bc2be | 294 | /*-- GPIOs Configuration -----------------------------------------------------*/ |
Kojto | 170:19eb464bc2be | 295 | /* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */ |
Kojto | 170:19eb464bc2be | 296 | RCC->AHB1ENR |= 0x00000078; |
Kojto | 170:19eb464bc2be | 297 | /* Delay after an RCC peripheral clock enabling */ |
Kojto | 170:19eb464bc2be | 298 | tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIODEN); |
Kojto | 170:19eb464bc2be | 299 | (void)(tmp); |
Kojto | 170:19eb464bc2be | 300 | |
Kojto | 170:19eb464bc2be | 301 | /* Connect PDx pins to FSMC Alternate function */ |
Kojto | 170:19eb464bc2be | 302 | GPIOD->AFR[0] = 0x00CCC0CC; |
Kojto | 170:19eb464bc2be | 303 | GPIOD->AFR[1] = 0xCCCCCCCC; |
Kojto | 170:19eb464bc2be | 304 | /* Configure PDx pins in Alternate function mode */ |
Kojto | 170:19eb464bc2be | 305 | GPIOD->MODER = 0xAAAA0A8A; |
Kojto | 170:19eb464bc2be | 306 | /* Configure PDx pins speed to 100 MHz */ |
Kojto | 170:19eb464bc2be | 307 | GPIOD->OSPEEDR = 0xFFFF0FCF; |
Kojto | 170:19eb464bc2be | 308 | /* Configure PDx pins Output type to push-pull */ |
Kojto | 170:19eb464bc2be | 309 | GPIOD->OTYPER = 0x00000000; |
Kojto | 170:19eb464bc2be | 310 | /* No pull-up, pull-down for PDx pins */ |
Kojto | 170:19eb464bc2be | 311 | GPIOD->PUPDR = 0x00000000; |
Kojto | 170:19eb464bc2be | 312 | |
Kojto | 170:19eb464bc2be | 313 | /* Connect PEx pins to FSMC Alternate function */ |
Kojto | 170:19eb464bc2be | 314 | GPIOE->AFR[0] = 0xC00CC0CC; |
Kojto | 170:19eb464bc2be | 315 | GPIOE->AFR[1] = 0xCCCCCCCC; |
Kojto | 170:19eb464bc2be | 316 | /* Configure PEx pins in Alternate function mode */ |
Kojto | 170:19eb464bc2be | 317 | GPIOE->MODER = 0xAAAA828A; |
Kojto | 170:19eb464bc2be | 318 | /* Configure PEx pins speed to 100 MHz */ |
Kojto | 170:19eb464bc2be | 319 | GPIOE->OSPEEDR = 0xFFFFC3CF; |
Kojto | 170:19eb464bc2be | 320 | /* Configure PEx pins Output type to push-pull */ |
Kojto | 170:19eb464bc2be | 321 | GPIOE->OTYPER = 0x00000000; |
Kojto | 170:19eb464bc2be | 322 | /* No pull-up, pull-down for PEx pins */ |
Kojto | 170:19eb464bc2be | 323 | GPIOE->PUPDR = 0x00000000; |
Kojto | 170:19eb464bc2be | 324 | |
Kojto | 170:19eb464bc2be | 325 | /* Connect PFx pins to FSMC Alternate function */ |
Kojto | 170:19eb464bc2be | 326 | GPIOF->AFR[0] = 0x00CCCCCC; |
Kojto | 170:19eb464bc2be | 327 | GPIOF->AFR[1] = 0xCCCC0000; |
Kojto | 170:19eb464bc2be | 328 | /* Configure PFx pins in Alternate function mode */ |
Kojto | 170:19eb464bc2be | 329 | GPIOF->MODER = 0xAA000AAA; |
Kojto | 170:19eb464bc2be | 330 | /* Configure PFx pins speed to 100 MHz */ |
Kojto | 170:19eb464bc2be | 331 | GPIOF->OSPEEDR = 0xFF000FFF; |
Kojto | 170:19eb464bc2be | 332 | /* Configure PFx pins Output type to push-pull */ |
Kojto | 170:19eb464bc2be | 333 | GPIOF->OTYPER = 0x00000000; |
Kojto | 170:19eb464bc2be | 334 | /* No pull-up, pull-down for PFx pins */ |
Kojto | 170:19eb464bc2be | 335 | GPIOF->PUPDR = 0x00000000; |
Kojto | 170:19eb464bc2be | 336 | |
Kojto | 170:19eb464bc2be | 337 | /* Connect PGx pins to FSMC Alternate function */ |
Kojto | 170:19eb464bc2be | 338 | GPIOG->AFR[0] = 0x00CCCCCC; |
Kojto | 170:19eb464bc2be | 339 | GPIOG->AFR[1] = 0x000000C0; |
Kojto | 170:19eb464bc2be | 340 | /* Configure PGx pins in Alternate function mode */ |
Kojto | 170:19eb464bc2be | 341 | GPIOG->MODER = 0x00085AAA; |
Kojto | 170:19eb464bc2be | 342 | /* Configure PGx pins speed to 100 MHz */ |
Kojto | 170:19eb464bc2be | 343 | GPIOG->OSPEEDR = 0x000CAFFF; |
Kojto | 170:19eb464bc2be | 344 | /* Configure PGx pins Output type to push-pull */ |
Kojto | 170:19eb464bc2be | 345 | GPIOG->OTYPER = 0x00000000; |
Kojto | 170:19eb464bc2be | 346 | /* No pull-up, pull-down for PGx pins */ |
Kojto | 170:19eb464bc2be | 347 | GPIOG->PUPDR = 0x00000000; |
Kojto | 170:19eb464bc2be | 348 | |
Kojto | 170:19eb464bc2be | 349 | /*--FSMC Configuration -------------------------------------------------------*/ |
Kojto | 170:19eb464bc2be | 350 | /* Enable the FSMC interface clock */ |
Kojto | 170:19eb464bc2be | 351 | RCC->AHB3ENR |= 0x00000001; |
Kojto | 170:19eb464bc2be | 352 | |
Kojto | 170:19eb464bc2be | 353 | /* Configure and enable Bank1_SRAM2 */ |
Kojto | 170:19eb464bc2be | 354 | FSMC_Bank1->BTCR[2] = 0x00001011; |
Kojto | 170:19eb464bc2be | 355 | FSMC_Bank1->BTCR[3] = 0x00000201; |
Kojto | 170:19eb464bc2be | 356 | FSMC_Bank1E->BWTR[2] = 0x0FFFFFFF; |
Kojto | 170:19eb464bc2be | 357 | } |
Kojto | 170:19eb464bc2be | 358 | #endif /* DATA_IN_ExtSRAM */ |
Kojto | 170:19eb464bc2be | 359 | |
Kojto | 170:19eb464bc2be | 360 | |
Kojto | 170:19eb464bc2be | 361 | /** |
Kojto | 170:19eb464bc2be | 362 | * @} |
Kojto | 170:19eb464bc2be | 363 | */ |
Kojto | 170:19eb464bc2be | 364 | |
Kojto | 170:19eb464bc2be | 365 | /** |
Kojto | 170:19eb464bc2be | 366 | * @} |
Kojto | 170:19eb464bc2be | 367 | */ |
Kojto | 170:19eb464bc2be | 368 | |
Kojto | 170:19eb464bc2be | 369 | /** |
Kojto | 170:19eb464bc2be | 370 | * @} |
Kojto | 170:19eb464bc2be | 371 | */ |
Kojto | 170:19eb464bc2be | 372 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |