amiro-blt / Target / Modules / LightRing_1-0 / Boot / lib / CMSIS / CM3 / DeviceSupport / ST / STM32F10x / system_stm32f10x.c @ 367c0652
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/**
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******************************************************************************
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* @file system_stm32f10x.c
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* @author MCD Application Team
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* @version V3.5.0
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* @date 11-March-2011
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* @brief CMSIS Cortex-M3 Device Peripheral Access Layer System Source File.
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*
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* 1. This file provides two functions and one global variable to be called from
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* user application:
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* - SystemInit(): Setups the system clock (System clock source, PLL Multiplier
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* factors, AHB/APBx prescalers and Flash settings).
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* This function is called at startup just after reset and
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* before branch to main program. This call is made inside
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* the "startup_stm32f10x_xx.s" file.
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*
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* - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
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* by the user application to setup the SysTick
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* timer or configure other parameters.
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*
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* - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
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* be called whenever the core clock is changed
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* during program execution.
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*
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* 2. After each device reset the HSI (8 MHz) is used as system clock source.
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* Then SystemInit() function is called, in "startup_stm32f10x_xx.s" file, to
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* configure the system clock before to branch to main program.
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*
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* 3. If the system clock source selected by user fails to startup, the SystemInit()
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* function will do nothing and HSI still used as system clock source. User can
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* add some code to deal with this issue inside the SetSysClock() function.
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*
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* 4. The default value of HSE crystal is set to 8 MHz (or 25 MHz, depedning on
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* the product used), refer to "HSE_VALUE" define in "stm32f10x.h" file.
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* When HSE is used as system clock source, directly or through PLL, and you
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* are using different crystal you have to adapt the HSE value to your own
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* configuration.
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*
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******************************************************************************
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* @attention
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*
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* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
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******************************************************************************
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*/
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/** @addtogroup CMSIS
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* @{
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*/
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/** @addtogroup stm32f10x_system
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* @{
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*/
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/** @addtogroup STM32F10x_System_Private_Includes
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* @{
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*/
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#include "stm32f10x.h" |
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/**
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* @}
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*/
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/** @addtogroup STM32F10x_System_Private_TypesDefinitions
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* @{
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*/
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/**
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* @}
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*/
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/** @addtogroup STM32F10x_System_Private_Defines
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* @{
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*/
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/*!< Uncomment the line corresponding to the desired System clock (SYSCLK)
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frequency (after reset the HSI is used as SYSCLK source)
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IMPORTANT NOTE:
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==============
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1. After each device reset the HSI is used as System clock source.
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2. Please make sure that the selected System clock doesn't exceed your device's
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maximum frequency.
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3. If none of the define below is enabled, the HSI is used as System clock
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source.
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4. The System clock configuration functions provided within this file assume that:
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- For Low, Medium and High density Value line devices an external 8MHz
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crystal is used to drive the System clock.
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- For Low, Medium and High density devices an external 8MHz crystal is
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used to drive the System clock.
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- For Connectivity line devices an external 25MHz crystal is used to drive
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the System clock.
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If you are using different crystal you have to adapt those functions accordingly.
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*/
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#if defined (STM32F10X_LD_VL) || (defined STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
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/* #define SYSCLK_FREQ_HSE HSE_VALUE */
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#define SYSCLK_FREQ_24MHz 24000000 |
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#else
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/* #define SYSCLK_FREQ_HSE HSE_VALUE */
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/* #define SYSCLK_FREQ_24MHz 24000000 */
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/* #define SYSCLK_FREQ_36MHz 36000000 */
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/* #define SYSCLK_FREQ_48MHz 48000000 */
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/* #define SYSCLK_FREQ_56MHz 56000000 */
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#define SYSCLK_FREQ_72MHz 72000000 |
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#endif
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/*!< Uncomment the following line if you need to use external SRAM mounted
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on STM3210E-EVAL board (STM32 High density and XL-density devices) or on
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STM32100E-EVAL board (STM32 High-density value line devices) as data memory */
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#if defined (STM32F10X_HD) || (defined STM32F10X_XL) || (defined STM32F10X_HD_VL)
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/* #define DATA_IN_ExtSRAM */
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#endif
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/*!< Uncomment the following line if you need to relocate your vector Table in
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Internal SRAM. */
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/* #define VECT_TAB_SRAM */
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#define VECT_TAB_OFFSET 0x0 /*!< Vector Table base offset field. |
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This value must be a multiple of 0x200. */
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/**
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* @}
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*/
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/** @addtogroup STM32F10x_System_Private_Macros
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* @{
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*/
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/**
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* @}
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*/
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/** @addtogroup STM32F10x_System_Private_Variables
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* @{
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*/
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/*******************************************************************************
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* Clock Definitions
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*******************************************************************************/
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#ifdef SYSCLK_FREQ_HSE
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uint32_t SystemCoreClock = SYSCLK_FREQ_HSE; /*!< System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_24MHz
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uint32_t SystemCoreClock = SYSCLK_FREQ_24MHz; /*!< System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_36MHz
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uint32_t SystemCoreClock = SYSCLK_FREQ_36MHz; /*!< System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_48MHz
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uint32_t SystemCoreClock = SYSCLK_FREQ_48MHz; /*!< System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_56MHz
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uint32_t SystemCoreClock = SYSCLK_FREQ_56MHz; /*!< System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_FREQ_72MHz
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uint32_t SystemCoreClock = SYSCLK_FREQ_72MHz; /*!< System Clock Frequency (Core Clock) */
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#else /*!< HSI Selected as System Clock source */ |
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uint32_t SystemCoreClock = HSI_VALUE; /*!< System Clock Frequency (Core Clock) */
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#endif
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__I uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; |
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/**
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* @}
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*/
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/** @addtogroup STM32F10x_System_Private_FunctionPrototypes
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* @{
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*/
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static void SetSysClock(void); |
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#ifdef SYSCLK_FREQ_HSE
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static void SetSysClockToHSE(void); |
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#elif defined SYSCLK_FREQ_24MHz
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static void SetSysClockTo24(void); |
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#elif defined SYSCLK_FREQ_36MHz
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static void SetSysClockTo36(void); |
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#elif defined SYSCLK_FREQ_48MHz
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static void SetSysClockTo48(void); |
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#elif defined SYSCLK_FREQ_56MHz
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static void SetSysClockTo56(void); |
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#elif defined SYSCLK_FREQ_72MHz
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static void SetSysClockTo72(void); |
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#endif
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#ifdef DATA_IN_ExtSRAM
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static void SystemInit_ExtMemCtl(void); |
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#endif /* DATA_IN_ExtSRAM */ |
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/**
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* @}
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*/
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/** @addtogroup STM32F10x_System_Private_Functions
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* @{
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*/
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/**
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* @brief Setup the microcontroller system
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* Initialize the Embedded Flash Interface, the PLL and update the
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* SystemCoreClock variable.
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* @note This function should be used only after reset.
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* @param None
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* @retval None
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*/
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void SystemInit (void) |
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{
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/* Reset the RCC clock configuration to the default reset state(for debug purpose) */
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/* Set HSION bit */
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RCC->CR |= (uint32_t)0x00000001;
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/* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
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#ifndef STM32F10X_CL
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RCC->CFGR &= (uint32_t)0xF8FF0000;
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#else
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RCC->CFGR &= (uint32_t)0xF0FF0000;
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#endif /* STM32F10X_CL */ |
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/* Reset HSEON, CSSON and PLLON bits */
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RCC->CR &= (uint32_t)0xFEF6FFFF;
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/* Reset HSEBYP bit */
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RCC->CR &= (uint32_t)0xFFFBFFFF;
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/* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
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RCC->CFGR &= (uint32_t)0xFF80FFFF;
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#ifdef STM32F10X_CL
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/* Reset PLL2ON and PLL3ON bits */
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RCC->CR &= (uint32_t)0xEBFFFFFF;
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/* Disable all interrupts and clear pending bits */
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RCC->CIR = 0x00FF0000;
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/* Reset CFGR2 register */
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RCC->CFGR2 = 0x00000000;
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#elif defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
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/* Disable all interrupts and clear pending bits */
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RCC->CIR = 0x009F0000;
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/* Reset CFGR2 register */
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RCC->CFGR2 = 0x00000000;
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#else
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/* Disable all interrupts and clear pending bits */
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RCC->CIR = 0x009F0000;
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#endif /* STM32F10X_CL */ |
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#if defined (STM32F10X_HD) || (defined STM32F10X_XL) || (defined STM32F10X_HD_VL)
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#ifdef DATA_IN_ExtSRAM
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SystemInit_ExtMemCtl(); |
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#endif /* DATA_IN_ExtSRAM */ |
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#endif
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/* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */
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/* Configure the Flash Latency cycles and enable prefetch buffer */
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SetSysClock(); |
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#ifdef VECT_TAB_SRAM
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SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
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#else
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SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
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#endif
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} |
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/**
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* @brief Update SystemCoreClock variable according to Clock Register Values.
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* The SystemCoreClock variable contains the core clock (HCLK), it can
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* be used by the user application to setup the SysTick timer or configure
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* other parameters.
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*
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* @note Each time the core clock (HCLK) changes, this function must be called
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* to update SystemCoreClock variable value. Otherwise, any configuration
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* based on this variable will be incorrect.
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*
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* @note - The system frequency computed by this function is not the real
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* frequency in the chip. It is calculated based on the predefined
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* constant and the selected clock source:
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*
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* - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
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*
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* - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
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*
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* - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)
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* or HSI_VALUE(*) multiplied by the PLL factors.
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*
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* (*) HSI_VALUE is a constant defined in stm32f1xx.h file (default value
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* 8 MHz) but the real value may vary depending on the variations
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* in voltage and temperature.
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*
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* (**) HSE_VALUE is a constant defined in stm32f1xx.h file (default value
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* 8 MHz or 25 MHz, depedning on the product used), user has to ensure
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* that HSE_VALUE is same as the real frequency of the crystal used.
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* Otherwise, this function may have wrong result.
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*
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* - The result of this function could be not correct when using fractional
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* value for HSE crystal.
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* @param None
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* @retval None
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*/
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void SystemCoreClockUpdate (void) |
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{
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uint32_t tmp = 0, pllmull = 0, pllsource = 0; |
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#ifdef STM32F10X_CL
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uint32_t prediv1source = 0, prediv1factor = 0, prediv2factor = 0, pll2mull = 0; |
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#endif /* STM32F10X_CL */ |
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#if defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
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uint32_t prediv1factor = 0;
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#endif /* STM32F10X_LD_VL or STM32F10X_MD_VL or STM32F10X_HD_VL */ |
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/* Get SYSCLK source -------------------------------------------------------*/
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tmp = RCC->CFGR & RCC_CFGR_SWS; |
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switch (tmp)
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{
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case 0x00: /* HSI used as system clock */ |
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SystemCoreClock = HSI_VALUE; |
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break;
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case 0x04: /* HSE used as system clock */ |
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SystemCoreClock = HSE_VALUE; |
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break;
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case 0x08: /* PLL used as system clock */ |
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/* Get PLL clock source and multiplication factor ----------------------*/
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pllmull = RCC->CFGR & RCC_CFGR_PLLMULL; |
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pllsource = RCC->CFGR & RCC_CFGR_PLLSRC; |
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#ifndef STM32F10X_CL
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pllmull = ( pllmull >> 18) + 2; |
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if (pllsource == 0x00) |
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{
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/* HSI oscillator clock divided by 2 selected as PLL clock entry */
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SystemCoreClock = (HSI_VALUE >> 1) * pllmull;
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} |
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else
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{
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#if defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
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prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1;
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/* HSE oscillator clock selected as PREDIV1 clock entry */
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SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull; |
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#else
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/* HSE selected as PLL clock entry */
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if ((RCC->CFGR & RCC_CFGR_PLLXTPRE) != (uint32_t)RESET)
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{/* HSE oscillator clock divided by 2 */
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SystemCoreClock = (HSE_VALUE >> 1) * pllmull;
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} |
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else
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{
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SystemCoreClock = HSE_VALUE * pllmull; |
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} |
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#endif
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} |
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#else
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pllmull = pllmull >> 18;
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if (pllmull != 0x0D) |
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{
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pllmull += 2;
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} |
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else
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{ /* PLL multiplication factor = PLL input clock * 6.5 */
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pllmull = 13 / 2; |
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} |
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if (pllsource == 0x00) |
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{
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/* HSI oscillator clock divided by 2 selected as PLL clock entry */
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SystemCoreClock = (HSI_VALUE >> 1) * pllmull;
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} |
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else
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{/* PREDIV1 selected as PLL clock entry */
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/* Get PREDIV1 clock source and division factor */
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prediv1source = RCC->CFGR2 & RCC_CFGR2_PREDIV1SRC; |
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prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1;
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if (prediv1source == 0) |
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{
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/* HSE oscillator clock selected as PREDIV1 clock entry */
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SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull; |
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} |
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else
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{/* PLL2 clock selected as PREDIV1 clock entry */
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/* Get PREDIV2 division factor and PLL2 multiplication factor */
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prediv2factor = ((RCC->CFGR2 & RCC_CFGR2_PREDIV2) >> 4) + 1; |
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pll2mull = ((RCC->CFGR2 & RCC_CFGR2_PLL2MUL) >> 8 ) + 2; |
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SystemCoreClock = (((HSE_VALUE / prediv2factor) * pll2mull) / prediv1factor) * pllmull; |
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} |
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} |
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#endif /* STM32F10X_CL */ |
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break;
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default:
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SystemCoreClock = HSI_VALUE; |
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break;
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} |
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/* Compute HCLK clock frequency ----------------*/
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/* Get HCLK prescaler */
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tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
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/* HCLK clock frequency */
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SystemCoreClock >>= tmp; |
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} |
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/**
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* @brief Configures the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers.
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* @param None
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* @retval None
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*/
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static void SetSysClock(void) |
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{
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#ifdef SYSCLK_FREQ_HSE
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SetSysClockToHSE(); |
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#elif defined SYSCLK_FREQ_24MHz
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SetSysClockTo24(); |
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#elif defined SYSCLK_FREQ_36MHz
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SetSysClockTo36(); |
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#elif defined SYSCLK_FREQ_48MHz
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SetSysClockTo48(); |
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#elif defined SYSCLK_FREQ_56MHz
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SetSysClockTo56(); |
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#elif defined SYSCLK_FREQ_72MHz
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SetSysClockTo72(); |
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#endif
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/* If none of the define above is enabled, the HSI is used as System clock
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source (default after reset) */
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} |
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|
| 439 |
/**
|
| 440 |
* @brief Setup the external memory controller. Called in startup_stm32f10x.s
|
| 441 |
* before jump to __main
|
| 442 |
* @param None
|
| 443 |
* @retval None
|
| 444 |
*/
|
| 445 |
#ifdef DATA_IN_ExtSRAM
|
| 446 |
/**
|
| 447 |
* @brief Setup the external memory controller.
|
| 448 |
* Called in startup_stm32f10x_xx.s/.c before jump to main.
|
| 449 |
* This function configures the external SRAM mounted on STM3210E-EVAL
|
| 450 |
* board (STM32 High density devices). This SRAM will be used as program
|
| 451 |
* data memory (including heap and stack).
|
| 452 |
* @param None
|
| 453 |
* @retval None
|
| 454 |
*/
|
| 455 |
void SystemInit_ExtMemCtl(void) |
| 456 |
{
|
| 457 |
/*!< FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is
|
| 458 |
required, then adjust the Register Addresses */
|
| 459 |
|
| 460 |
/* Enable FSMC clock */
|
| 461 |
RCC->AHBENR = 0x00000114;
|
| 462 |
|
| 463 |
/* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */
|
| 464 |
RCC->APB2ENR = 0x000001E0;
|
| 465 |
|
| 466 |
/* --------------- SRAM Data lines, NOE and NWE configuration ---------------*/
|
| 467 |
/*---------------- SRAM Address lines configuration -------------------------*/
|
| 468 |
/*---------------- NOE and NWE configuration --------------------------------*/
|
| 469 |
/*---------------- NE3 configuration ----------------------------------------*/
|
| 470 |
/*---------------- NBL0, NBL1 configuration ---------------------------------*/
|
| 471 |
|
| 472 |
GPIOD->CRL = 0x44BB44BB;
|
| 473 |
GPIOD->CRH = 0xBBBBBBBB;
|
| 474 |
|
| 475 |
GPIOE->CRL = 0xB44444BB;
|
| 476 |
GPIOE->CRH = 0xBBBBBBBB;
|
| 477 |
|
| 478 |
GPIOF->CRL = 0x44BBBBBB;
|
| 479 |
GPIOF->CRH = 0xBBBB4444;
|
| 480 |
|
| 481 |
GPIOG->CRL = 0x44BBBBBB;
|
| 482 |
GPIOG->CRH = 0x44444B44;
|
| 483 |
|
| 484 |
/*---------------- FSMC Configuration ---------------------------------------*/
|
| 485 |
/*---------------- Enable FSMC Bank1_SRAM Bank ------------------------------*/
|
| 486 |
|
| 487 |
FSMC_Bank1->BTCR[4] = 0x00001011; |
| 488 |
FSMC_Bank1->BTCR[5] = 0x00000200; |
| 489 |
} |
| 490 |
#endif /* DATA_IN_ExtSRAM */ |
| 491 |
|
| 492 |
#ifdef SYSCLK_FREQ_HSE
|
| 493 |
/**
|
| 494 |
* @brief Selects HSE as System clock source and configure HCLK, PCLK2
|
| 495 |
* and PCLK1 prescalers.
|
| 496 |
* @note This function should be used only after reset.
|
| 497 |
* @param None
|
| 498 |
* @retval None
|
| 499 |
*/
|
| 500 |
static void SetSysClockToHSE(void) |
| 501 |
{
|
| 502 |
__IO uint32_t StartUpCounter = 0, HSEStatus = 0; |
| 503 |
|
| 504 |
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
|
| 505 |
/* Enable HSE */
|
| 506 |
RCC->CR |= ((uint32_t)RCC_CR_HSEON); |
| 507 |
|
| 508 |
/* Wait till HSE is ready and if Time out is reached exit */
|
| 509 |
do
|
| 510 |
{
|
| 511 |
HSEStatus = RCC->CR & RCC_CR_HSERDY; |
| 512 |
StartUpCounter++; |
| 513 |
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); |
| 514 |
|
| 515 |
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
|
| 516 |
{
|
| 517 |
HSEStatus = (uint32_t)0x01;
|
| 518 |
} |
| 519 |
else
|
| 520 |
{
|
| 521 |
HSEStatus = (uint32_t)0x00;
|
| 522 |
} |
| 523 |
|
| 524 |
if (HSEStatus == (uint32_t)0x01) |
| 525 |
{
|
| 526 |
|
| 527 |
#if !defined STM32F10X_LD_VL && !defined STM32F10X_MD_VL && !defined STM32F10X_HD_VL
|
| 528 |
/* Enable Prefetch Buffer */
|
| 529 |
FLASH->ACR |= FLASH_ACR_PRFTBE; |
| 530 |
|
| 531 |
/* Flash 0 wait state */
|
| 532 |
FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); |
| 533 |
|
| 534 |
#ifndef STM32F10X_CL
|
| 535 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0; |
| 536 |
#else
|
| 537 |
if (HSE_VALUE <= 24000000) |
| 538 |
{
|
| 539 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0; |
| 540 |
} |
| 541 |
else
|
| 542 |
{
|
| 543 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1; |
| 544 |
} |
| 545 |
#endif /* STM32F10X_CL */ |
| 546 |
#endif
|
| 547 |
|
| 548 |
/* HCLK = SYSCLK */
|
| 549 |
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; |
| 550 |
|
| 551 |
/* PCLK2 = HCLK */
|
| 552 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; |
| 553 |
|
| 554 |
/* PCLK1 = HCLK */
|
| 555 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; |
| 556 |
|
| 557 |
/* Select HSE as system clock source */
|
| 558 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); |
| 559 |
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSE; |
| 560 |
|
| 561 |
/* Wait till HSE is used as system clock source */
|
| 562 |
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x04) |
| 563 |
{
|
| 564 |
} |
| 565 |
} |
| 566 |
else
|
| 567 |
{ /* If HSE fails to start-up, the application will have wrong clock
|
| 568 |
configuration. User can add here some code to deal with this error */
|
| 569 |
} |
| 570 |
} |
| 571 |
#elif defined SYSCLK_FREQ_24MHz
|
| 572 |
/**
|
| 573 |
* @brief Sets System clock frequency to 24MHz and configure HCLK, PCLK2
|
| 574 |
* and PCLK1 prescalers.
|
| 575 |
* @note This function should be used only after reset.
|
| 576 |
* @param None
|
| 577 |
* @retval None
|
| 578 |
*/
|
| 579 |
static void SetSysClockTo24(void) |
| 580 |
{
|
| 581 |
__IO uint32_t StartUpCounter = 0, HSEStatus = 0; |
| 582 |
|
| 583 |
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
|
| 584 |
/* Enable HSE */
|
| 585 |
RCC->CR |= ((uint32_t)RCC_CR_HSEON); |
| 586 |
|
| 587 |
/* Wait till HSE is ready and if Time out is reached exit */
|
| 588 |
do
|
| 589 |
{
|
| 590 |
HSEStatus = RCC->CR & RCC_CR_HSERDY; |
| 591 |
StartUpCounter++; |
| 592 |
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); |
| 593 |
|
| 594 |
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
|
| 595 |
{
|
| 596 |
HSEStatus = (uint32_t)0x01;
|
| 597 |
} |
| 598 |
else
|
| 599 |
{
|
| 600 |
HSEStatus = (uint32_t)0x00;
|
| 601 |
} |
| 602 |
|
| 603 |
if (HSEStatus == (uint32_t)0x01) |
| 604 |
{
|
| 605 |
#if !defined STM32F10X_LD_VL && !defined STM32F10X_MD_VL && !defined STM32F10X_HD_VL
|
| 606 |
/* Enable Prefetch Buffer */
|
| 607 |
FLASH->ACR |= FLASH_ACR_PRFTBE; |
| 608 |
|
| 609 |
/* Flash 0 wait state */
|
| 610 |
FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); |
| 611 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0; |
| 612 |
#endif
|
| 613 |
|
| 614 |
/* HCLK = SYSCLK */
|
| 615 |
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; |
| 616 |
|
| 617 |
/* PCLK2 = HCLK */
|
| 618 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; |
| 619 |
|
| 620 |
/* PCLK1 = HCLK */
|
| 621 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; |
| 622 |
|
| 623 |
#ifdef STM32F10X_CL
|
| 624 |
/* Configure PLLs ------------------------------------------------------*/
|
| 625 |
/* PLL configuration: PLLCLK = PREDIV1 * 6 = 24 MHz */
|
| 626 |
RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); |
| 627 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | |
| 628 |
RCC_CFGR_PLLMULL6); |
| 629 |
|
| 630 |
/* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
|
| 631 |
/* PREDIV1 configuration: PREDIV1CLK = PLL2 / 10 = 4 MHz */
|
| 632 |
RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | |
| 633 |
RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); |
| 634 |
RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | |
| 635 |
RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV10); |
| 636 |
|
| 637 |
/* Enable PLL2 */
|
| 638 |
RCC->CR |= RCC_CR_PLL2ON; |
| 639 |
/* Wait till PLL2 is ready */
|
| 640 |
while((RCC->CR & RCC_CR_PLL2RDY) == 0) |
| 641 |
{
|
| 642 |
} |
| 643 |
#elif defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || defined (STM32F10X_HD_VL)
|
| 644 |
/* PLL configuration: = (HSE / 2) * 6 = 24 MHz */
|
| 645 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); |
| 646 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_PREDIV1 | RCC_CFGR_PLLXTPRE_PREDIV1_Div2 | RCC_CFGR_PLLMULL6); |
| 647 |
#else
|
| 648 |
/* PLL configuration: = (HSE / 2) * 6 = 24 MHz */
|
| 649 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); |
| 650 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLXTPRE_HSE_Div2 | RCC_CFGR_PLLMULL6); |
| 651 |
#endif /* STM32F10X_CL */ |
| 652 |
|
| 653 |
/* Enable PLL */
|
| 654 |
RCC->CR |= RCC_CR_PLLON; |
| 655 |
|
| 656 |
/* Wait till PLL is ready */
|
| 657 |
while((RCC->CR & RCC_CR_PLLRDY) == 0) |
| 658 |
{
|
| 659 |
} |
| 660 |
|
| 661 |
/* Select PLL as system clock source */
|
| 662 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); |
| 663 |
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; |
| 664 |
|
| 665 |
/* Wait till PLL is used as system clock source */
|
| 666 |
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) |
| 667 |
{
|
| 668 |
} |
| 669 |
} |
| 670 |
else
|
| 671 |
{ /* If HSE fails to start-up, the application will have wrong clock
|
| 672 |
configuration. User can add here some code to deal with this error */
|
| 673 |
} |
| 674 |
} |
| 675 |
#elif defined SYSCLK_FREQ_36MHz
|
| 676 |
/**
|
| 677 |
* @brief Sets System clock frequency to 36MHz and configure HCLK, PCLK2
|
| 678 |
* and PCLK1 prescalers.
|
| 679 |
* @note This function should be used only after reset.
|
| 680 |
* @param None
|
| 681 |
* @retval None
|
| 682 |
*/
|
| 683 |
static void SetSysClockTo36(void) |
| 684 |
{
|
| 685 |
__IO uint32_t StartUpCounter = 0, HSEStatus = 0; |
| 686 |
|
| 687 |
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
|
| 688 |
/* Enable HSE */
|
| 689 |
RCC->CR |= ((uint32_t)RCC_CR_HSEON); |
| 690 |
|
| 691 |
/* Wait till HSE is ready and if Time out is reached exit */
|
| 692 |
do
|
| 693 |
{
|
| 694 |
HSEStatus = RCC->CR & RCC_CR_HSERDY; |
| 695 |
StartUpCounter++; |
| 696 |
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); |
| 697 |
|
| 698 |
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
|
| 699 |
{
|
| 700 |
HSEStatus = (uint32_t)0x01;
|
| 701 |
} |
| 702 |
else
|
| 703 |
{
|
| 704 |
HSEStatus = (uint32_t)0x00;
|
| 705 |
} |
| 706 |
|
| 707 |
if (HSEStatus == (uint32_t)0x01) |
| 708 |
{
|
| 709 |
/* Enable Prefetch Buffer */
|
| 710 |
FLASH->ACR |= FLASH_ACR_PRFTBE; |
| 711 |
|
| 712 |
/* Flash 1 wait state */
|
| 713 |
FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); |
| 714 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1; |
| 715 |
|
| 716 |
/* HCLK = SYSCLK */
|
| 717 |
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; |
| 718 |
|
| 719 |
/* PCLK2 = HCLK */
|
| 720 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; |
| 721 |
|
| 722 |
/* PCLK1 = HCLK */
|
| 723 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; |
| 724 |
|
| 725 |
#ifdef STM32F10X_CL
|
| 726 |
/* Configure PLLs ------------------------------------------------------*/
|
| 727 |
|
| 728 |
/* PLL configuration: PLLCLK = PREDIV1 * 9 = 36 MHz */
|
| 729 |
RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); |
| 730 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | |
| 731 |
RCC_CFGR_PLLMULL9); |
| 732 |
|
| 733 |
/*!< PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
|
| 734 |
/* PREDIV1 configuration: PREDIV1CLK = PLL2 / 10 = 4 MHz */
|
| 735 |
|
| 736 |
RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | |
| 737 |
RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); |
| 738 |
RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | |
| 739 |
RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV10); |
| 740 |
|
| 741 |
/* Enable PLL2 */
|
| 742 |
RCC->CR |= RCC_CR_PLL2ON; |
| 743 |
/* Wait till PLL2 is ready */
|
| 744 |
while((RCC->CR & RCC_CR_PLL2RDY) == 0) |
| 745 |
{
|
| 746 |
} |
| 747 |
|
| 748 |
#else
|
| 749 |
/* PLL configuration: PLLCLK = (HSE / 2) * 9 = 36 MHz */
|
| 750 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); |
| 751 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLXTPRE_HSE_Div2 | RCC_CFGR_PLLMULL9); |
| 752 |
#endif /* STM32F10X_CL */ |
| 753 |
|
| 754 |
/* Enable PLL */
|
| 755 |
RCC->CR |= RCC_CR_PLLON; |
| 756 |
|
| 757 |
/* Wait till PLL is ready */
|
| 758 |
while((RCC->CR & RCC_CR_PLLRDY) == 0) |
| 759 |
{
|
| 760 |
} |
| 761 |
|
| 762 |
/* Select PLL as system clock source */
|
| 763 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); |
| 764 |
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; |
| 765 |
|
| 766 |
/* Wait till PLL is used as system clock source */
|
| 767 |
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) |
| 768 |
{
|
| 769 |
} |
| 770 |
} |
| 771 |
else
|
| 772 |
{ /* If HSE fails to start-up, the application will have wrong clock
|
| 773 |
configuration. User can add here some code to deal with this error */
|
| 774 |
} |
| 775 |
} |
| 776 |
#elif defined SYSCLK_FREQ_48MHz
|
| 777 |
/**
|
| 778 |
* @brief Sets System clock frequency to 48MHz and configure HCLK, PCLK2
|
| 779 |
* and PCLK1 prescalers.
|
| 780 |
* @note This function should be used only after reset.
|
| 781 |
* @param None
|
| 782 |
* @retval None
|
| 783 |
*/
|
| 784 |
static void SetSysClockTo48(void) |
| 785 |
{
|
| 786 |
__IO uint32_t StartUpCounter = 0, HSEStatus = 0; |
| 787 |
|
| 788 |
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
|
| 789 |
/* Enable HSE */
|
| 790 |
RCC->CR |= ((uint32_t)RCC_CR_HSEON); |
| 791 |
|
| 792 |
/* Wait till HSE is ready and if Time out is reached exit */
|
| 793 |
do
|
| 794 |
{
|
| 795 |
HSEStatus = RCC->CR & RCC_CR_HSERDY; |
| 796 |
StartUpCounter++; |
| 797 |
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); |
| 798 |
|
| 799 |
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
|
| 800 |
{
|
| 801 |
HSEStatus = (uint32_t)0x01;
|
| 802 |
} |
| 803 |
else
|
| 804 |
{
|
| 805 |
HSEStatus = (uint32_t)0x00;
|
| 806 |
} |
| 807 |
|
| 808 |
if (HSEStatus == (uint32_t)0x01) |
| 809 |
{
|
| 810 |
/* Enable Prefetch Buffer */
|
| 811 |
FLASH->ACR |= FLASH_ACR_PRFTBE; |
| 812 |
|
| 813 |
/* Flash 1 wait state */
|
| 814 |
FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); |
| 815 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1; |
| 816 |
|
| 817 |
/* HCLK = SYSCLK */
|
| 818 |
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; |
| 819 |
|
| 820 |
/* PCLK2 = HCLK */
|
| 821 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; |
| 822 |
|
| 823 |
/* PCLK1 = HCLK */
|
| 824 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2; |
| 825 |
|
| 826 |
#ifdef STM32F10X_CL
|
| 827 |
/* Configure PLLs ------------------------------------------------------*/
|
| 828 |
/* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
|
| 829 |
/* PREDIV1 configuration: PREDIV1CLK = PLL2 / 5 = 8 MHz */
|
| 830 |
|
| 831 |
RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | |
| 832 |
RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); |
| 833 |
RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | |
| 834 |
RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV5); |
| 835 |
|
| 836 |
/* Enable PLL2 */
|
| 837 |
RCC->CR |= RCC_CR_PLL2ON; |
| 838 |
/* Wait till PLL2 is ready */
|
| 839 |
while((RCC->CR & RCC_CR_PLL2RDY) == 0) |
| 840 |
{
|
| 841 |
} |
| 842 |
|
| 843 |
|
| 844 |
/* PLL configuration: PLLCLK = PREDIV1 * 6 = 48 MHz */
|
| 845 |
RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); |
| 846 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | |
| 847 |
RCC_CFGR_PLLMULL6); |
| 848 |
#else
|
| 849 |
/* PLL configuration: PLLCLK = HSE * 6 = 48 MHz */
|
| 850 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); |
| 851 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLMULL6); |
| 852 |
#endif /* STM32F10X_CL */ |
| 853 |
|
| 854 |
/* Enable PLL */
|
| 855 |
RCC->CR |= RCC_CR_PLLON; |
| 856 |
|
| 857 |
/* Wait till PLL is ready */
|
| 858 |
while((RCC->CR & RCC_CR_PLLRDY) == 0) |
| 859 |
{
|
| 860 |
} |
| 861 |
|
| 862 |
/* Select PLL as system clock source */
|
| 863 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); |
| 864 |
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; |
| 865 |
|
| 866 |
/* Wait till PLL is used as system clock source */
|
| 867 |
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) |
| 868 |
{
|
| 869 |
} |
| 870 |
} |
| 871 |
else
|
| 872 |
{ /* If HSE fails to start-up, the application will have wrong clock
|
| 873 |
configuration. User can add here some code to deal with this error */
|
| 874 |
} |
| 875 |
} |
| 876 |
|
| 877 |
#elif defined SYSCLK_FREQ_56MHz
|
| 878 |
/**
|
| 879 |
* @brief Sets System clock frequency to 56MHz and configure HCLK, PCLK2
|
| 880 |
* and PCLK1 prescalers.
|
| 881 |
* @note This function should be used only after reset.
|
| 882 |
* @param None
|
| 883 |
* @retval None
|
| 884 |
*/
|
| 885 |
static void SetSysClockTo56(void) |
| 886 |
{
|
| 887 |
__IO uint32_t StartUpCounter = 0, HSEStatus = 0; |
| 888 |
|
| 889 |
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
|
| 890 |
/* Enable HSE */
|
| 891 |
RCC->CR |= ((uint32_t)RCC_CR_HSEON); |
| 892 |
|
| 893 |
/* Wait till HSE is ready and if Time out is reached exit */
|
| 894 |
do
|
| 895 |
{
|
| 896 |
HSEStatus = RCC->CR & RCC_CR_HSERDY; |
| 897 |
StartUpCounter++; |
| 898 |
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); |
| 899 |
|
| 900 |
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
|
| 901 |
{
|
| 902 |
HSEStatus = (uint32_t)0x01;
|
| 903 |
} |
| 904 |
else
|
| 905 |
{
|
| 906 |
HSEStatus = (uint32_t)0x00;
|
| 907 |
} |
| 908 |
|
| 909 |
if (HSEStatus == (uint32_t)0x01) |
| 910 |
{
|
| 911 |
/* Enable Prefetch Buffer */
|
| 912 |
FLASH->ACR |= FLASH_ACR_PRFTBE; |
| 913 |
|
| 914 |
/* Flash 2 wait state */
|
| 915 |
FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); |
| 916 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2; |
| 917 |
|
| 918 |
/* HCLK = SYSCLK */
|
| 919 |
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; |
| 920 |
|
| 921 |
/* PCLK2 = HCLK */
|
| 922 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; |
| 923 |
|
| 924 |
/* PCLK1 = HCLK */
|
| 925 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2; |
| 926 |
|
| 927 |
#ifdef STM32F10X_CL
|
| 928 |
/* Configure PLLs ------------------------------------------------------*/
|
| 929 |
/* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
|
| 930 |
/* PREDIV1 configuration: PREDIV1CLK = PLL2 / 5 = 8 MHz */
|
| 931 |
|
| 932 |
RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | |
| 933 |
RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); |
| 934 |
RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | |
| 935 |
RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV5); |
| 936 |
|
| 937 |
/* Enable PLL2 */
|
| 938 |
RCC->CR |= RCC_CR_PLL2ON; |
| 939 |
/* Wait till PLL2 is ready */
|
| 940 |
while((RCC->CR & RCC_CR_PLL2RDY) == 0) |
| 941 |
{
|
| 942 |
} |
| 943 |
|
| 944 |
|
| 945 |
/* PLL configuration: PLLCLK = PREDIV1 * 7 = 56 MHz */
|
| 946 |
RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); |
| 947 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | |
| 948 |
RCC_CFGR_PLLMULL7); |
| 949 |
#else
|
| 950 |
/* PLL configuration: PLLCLK = HSE * 7 = 56 MHz */
|
| 951 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); |
| 952 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLMULL7); |
| 953 |
|
| 954 |
#endif /* STM32F10X_CL */ |
| 955 |
|
| 956 |
/* Enable PLL */
|
| 957 |
RCC->CR |= RCC_CR_PLLON; |
| 958 |
|
| 959 |
/* Wait till PLL is ready */
|
| 960 |
while((RCC->CR & RCC_CR_PLLRDY) == 0) |
| 961 |
{
|
| 962 |
} |
| 963 |
|
| 964 |
/* Select PLL as system clock source */
|
| 965 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); |
| 966 |
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; |
| 967 |
|
| 968 |
/* Wait till PLL is used as system clock source */
|
| 969 |
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) |
| 970 |
{
|
| 971 |
} |
| 972 |
} |
| 973 |
else
|
| 974 |
{ /* If HSE fails to start-up, the application will have wrong clock
|
| 975 |
configuration. User can add here some code to deal with this error */
|
| 976 |
} |
| 977 |
} |
| 978 |
|
| 979 |
#elif defined SYSCLK_FREQ_72MHz
|
| 980 |
/**
|
| 981 |
* @brief Sets System clock frequency to 72MHz and configure HCLK, PCLK2
|
| 982 |
* and PCLK1 prescalers.
|
| 983 |
* @note This function should be used only after reset.
|
| 984 |
* @param None
|
| 985 |
* @retval None
|
| 986 |
*/
|
| 987 |
static void SetSysClockTo72(void) |
| 988 |
{
|
| 989 |
__IO uint32_t StartUpCounter = 0, HSEStatus = 0; |
| 990 |
|
| 991 |
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
|
| 992 |
/* Enable HSE */
|
| 993 |
RCC->CR |= ((uint32_t)RCC_CR_HSEON); |
| 994 |
|
| 995 |
/* Wait till HSE is ready and if Time out is reached exit */
|
| 996 |
do
|
| 997 |
{
|
| 998 |
HSEStatus = RCC->CR & RCC_CR_HSERDY; |
| 999 |
StartUpCounter++; |
| 1000 |
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); |
| 1001 |
|
| 1002 |
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
|
| 1003 |
{
|
| 1004 |
HSEStatus = (uint32_t)0x01;
|
| 1005 |
} |
| 1006 |
else
|
| 1007 |
{
|
| 1008 |
HSEStatus = (uint32_t)0x00;
|
| 1009 |
} |
| 1010 |
|
| 1011 |
if (HSEStatus == (uint32_t)0x01) |
| 1012 |
{
|
| 1013 |
/* Enable Prefetch Buffer */
|
| 1014 |
FLASH->ACR |= FLASH_ACR_PRFTBE; |
| 1015 |
|
| 1016 |
/* Flash 2 wait state */
|
| 1017 |
FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); |
| 1018 |
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2; |
| 1019 |
|
| 1020 |
|
| 1021 |
/* HCLK = SYSCLK */
|
| 1022 |
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; |
| 1023 |
|
| 1024 |
/* PCLK2 = HCLK */
|
| 1025 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; |
| 1026 |
|
| 1027 |
/* PCLK1 = HCLK */
|
| 1028 |
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2; |
| 1029 |
|
| 1030 |
#ifdef STM32F10X_CL
|
| 1031 |
/* Configure PLLs ------------------------------------------------------*/
|
| 1032 |
/* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
|
| 1033 |
/* PREDIV1 configuration: PREDIV1CLK = PLL2 / 5 = 8 MHz */
|
| 1034 |
|
| 1035 |
RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | |
| 1036 |
RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); |
| 1037 |
RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | |
| 1038 |
RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV5); |
| 1039 |
|
| 1040 |
/* Enable PLL2 */
|
| 1041 |
RCC->CR |= RCC_CR_PLL2ON; |
| 1042 |
/* Wait till PLL2 is ready */
|
| 1043 |
while((RCC->CR & RCC_CR_PLL2RDY) == 0) |
| 1044 |
{
|
| 1045 |
} |
| 1046 |
|
| 1047 |
|
| 1048 |
/* PLL configuration: PLLCLK = PREDIV1 * 9 = 72 MHz */
|
| 1049 |
RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); |
| 1050 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | |
| 1051 |
RCC_CFGR_PLLMULL9); |
| 1052 |
#else
|
| 1053 |
/* PLL configuration: PLLCLK = HSE * 9 = 72 MHz */
|
| 1054 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | |
| 1055 |
RCC_CFGR_PLLMULL)); |
| 1056 |
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLMULL9); |
| 1057 |
#endif /* STM32F10X_CL */ |
| 1058 |
|
| 1059 |
/* Enable PLL */
|
| 1060 |
RCC->CR |= RCC_CR_PLLON; |
| 1061 |
|
| 1062 |
/* Wait till PLL is ready */
|
| 1063 |
while((RCC->CR & RCC_CR_PLLRDY) == 0) |
| 1064 |
{
|
| 1065 |
} |
| 1066 |
|
| 1067 |
/* Select PLL as system clock source */
|
| 1068 |
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); |
| 1069 |
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; |
| 1070 |
|
| 1071 |
/* Wait till PLL is used as system clock source */
|
| 1072 |
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) |
| 1073 |
{
|
| 1074 |
} |
| 1075 |
} |
| 1076 |
else
|
| 1077 |
{ /* If HSE fails to start-up, the application will have wrong clock
|
| 1078 |
configuration. User can add here some code to deal with this error */
|
| 1079 |
} |
| 1080 |
} |
| 1081 |
#endif
|
| 1082 |
|
| 1083 |
/**
|
| 1084 |
* @}
|
| 1085 |
*/
|
| 1086 |
|
| 1087 |
/**
|
| 1088 |
* @}
|
| 1089 |
*/
|
| 1090 |
|
| 1091 |
/**
|
| 1092 |
* @}
|
| 1093 |
*/
|
| 1094 |
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
|