663 lines
19 KiB
C
663 lines
19 KiB
C
/**
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******************************************************************************
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* @file system_MM32L0xx.c
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* @author AE Team
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* @version V2.0.0
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* @date 22/08/2017
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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_MM32x031_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 "system_MM32L0xx.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 "MM32L073.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, MINDMOTION 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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******************************************************************************
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*/
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/** @addtogroup CMSIS
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* @{
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*/
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#include "HAL_device.h"
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/**
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* @}
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*/
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/**
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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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//#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_HSI_24MHz 24000000
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//#define SYSCLK_HSI_36MHz 36000000
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#define SYSCLK_HSI_48MHz 48000000
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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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/*******************************************************************************
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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_HSI_24MHz
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uint32_t SystemCoreClock = SYSCLK_HSI_24MHz; /*!< System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_HSI_36MHz
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uint32_t SystemCoreClock = SYSCLK_HSI_36MHz; /*!< System Clock Frequency (Core Clock) */
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#elif defined SYSCLK_HSI_48MHz
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uint32_t SystemCoreClock = SYSCLK_HSI_48MHz; /*!< 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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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_HSI_24MHz
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static void SetSysClockTo24_HSI(void);
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#elif defined SYSCLK_HSI_36MHz
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static void SetSysClockTo36_HSI(void);
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#elif defined SYSCLK_HSI_48MHz
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static void SetSysClockTo48_HSI(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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/**
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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)0x1;
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/* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
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RCC->CFGR &= (uint32_t)0xF8FFC00C;
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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)0xFF3CFFFF;
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RCC->CR &= (uint32_t)0x008FFFFF;
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/* Disable all interrupts and clear pending bits */
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RCC->CIR &= 0xFF62E262;
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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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}
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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_HSI_24MHz
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SetSysClockTo24_HSI();
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#elif defined SYSCLK_HSI_36MHz
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SetSysClockTo36_HSI();
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#elif defined SYSCLK_HSI_48MHz
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SetSysClockTo48_HSI();
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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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#ifdef SYSCLK_FREQ_HSE
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/**
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* @brief Selects HSE as System clock source and configure HCLK, PCLK2
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* and PCLK1 prescalers.
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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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static void SetSysClockToHSE(void)
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{
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__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
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int nTime = 2;
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u16 i = 0;
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/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
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/* Enable HSE */
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RCC->CR |= ((uint32_t)RCC_CR_HSEON);
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/* Wait till HSE is ready and if Time out is reached exit */
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do
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{
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HSEStatus = RCC->CR & RCC_CR_HSERDY;
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StartUpCounter++;
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} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
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/* Software delay needs more than 2ms */
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while(nTime--)
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{
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i = 750;
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while(i--);
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}
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if ((RCC->CR & RCC_CR_HSERDY) != RESET)
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{
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HSEStatus = (uint32_t)0x01;
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}
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else
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{
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HSEStatus = (uint32_t)0x00;
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}
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if (HSEStatus == (uint32_t)0x01)
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{
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/* Enable Prefetch Buffer */
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FLASH->ACR |= FLASH_ACR_PRFTBE;
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/* Flash 0 wait state ,bit0~2*/
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FLASH->ACR &= ~0x07;
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/* HCLK = SYSCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
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/* PCLK2 = HCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
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/* PCLK1 = HCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1;
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/* Select HSE as system clock source */
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RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
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RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSE;
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/* Wait till HSE is used as system clock source */
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while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x04)
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{
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}
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}
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else
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{ /* If HSE fails to start-up, the application will have wrong clock
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configuration. User can add here some code to deal with this error */
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}
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}
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#elif defined SYSCLK_FREQ_24MHz
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/**
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* @brief Sets System clock frequency to 24MHz and configure HCLK, PCLK2
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* and PCLK1 prescalers.
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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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static void SetSysClockTo24(void)
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{
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__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
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int nTime = 2;
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u16 i = 0;
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/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
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/* Enable HSE */
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RCC->CR |= ((uint32_t)RCC_CR_HSEON);
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/* Wait till HSE is ready and if Time out is reached exit */
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do
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{
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HSEStatus = RCC->CR & RCC_CR_HSERDY;
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StartUpCounter++;
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} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
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/* Software delay needs more than 2ms */
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while(nTime--)
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{
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i = 750;
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while(i--);
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}
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if ((RCC->CR & RCC_CR_HSERDY) != RESET)
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{
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HSEStatus = (uint32_t)0x01;
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}
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else
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{
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HSEStatus = (uint32_t)0x00;
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}
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if (HSEStatus == (uint32_t)0x01)
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{
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/* Enable Prefetch Buffer */
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FLASH->ACR |= FLASH_ACR_PRFTBE;
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/* Flash 0 wait state ,bit0~2*/
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FLASH->ACR &= ~0x07;
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FLASH->ACR |= 0x01;
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/* HCLK = SYSCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
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/* PCLK2 = HCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
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/* PCLK1 = HCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1;
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/* PLL configuration: = (HSE ) * (2+1) = 24 MHz */
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RCC->CFGR &= (uint32_t)0xFFFCFFFF;
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RCC->CR &= (uint32_t)0x000FFFFF;
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RCC->CFGR |= (uint32_t)RCC_CFGR_PLLSRC ;
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RCC->CR |= 0x08000000;//pll=3/1
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/* Enable PLL */
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RCC->CR |= RCC_CR_PLLON;
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/* Wait till PLL is ready */
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while((RCC->CR & RCC_CR_PLLRDY) == 0)
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{
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}
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/* Select PLL as system clock source */
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RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
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RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;
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/* Wait till PLL is used as system clock source */
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while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
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{
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}
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}
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else
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{ /* If HSE fails to start-up, the application will have wrong clock
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configuration. User can add here some code to deal with this error */
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}
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}
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#elif defined SYSCLK_FREQ_36MHz
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/**
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* @brief Sets System clock frequency to 36MHz and configure HCLK, PCLK2
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* and PCLK1 prescalers.
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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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static void SetSysClockTo36(void)
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{
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__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
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int nTime = 2;
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u16 i = 0;
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/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
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/* Enable HSE */
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RCC->CR |= ((uint32_t)RCC_CR_HSEON);
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/* Wait till HSE is ready and if Time out is reached exit */
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do
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{
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HSEStatus = RCC->CR & RCC_CR_HSERDY;
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StartUpCounter++;
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} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
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/* Software delay needs more than 2ms */
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while(nTime--)
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{
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i = 750;
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while(i--);
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}
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if ((RCC->CR & RCC_CR_HSERDY) != RESET)
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{
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HSEStatus = (uint32_t)0x01;
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}
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else
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{
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HSEStatus = (uint32_t)0x00;
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}
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if (HSEStatus == (uint32_t)0x01)
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{
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/* Enable Prefetch Buffer */
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FLASH->ACR |= FLASH_ACR_PRFTBE;
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/* Flash 0 wait state ,bit0~2*/
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FLASH->ACR &= ~0x07;
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FLASH->ACR |= 0x01;
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/* HCLK = SYSCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
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/* PCLK2 = HCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
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/* PCLK1 = HCLK */
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RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1;
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/* PLL configuration: = (HSE ) * (8+1)/(1+1) = 36 MHz */
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RCC->CFGR &= (uint32_t)0xFFFCFFFF;
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RCC->CR &= (uint32_t)0x000FFFFF;
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RCC->CFGR |= (uint32_t)RCC_CFGR_PLLSRC ;
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RCC->CR |= 0x20100000;//pll = 9/2
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/* Enable PLL */
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RCC->CR |= RCC_CR_PLLON;
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/* Wait till PLL is ready */
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while((RCC->CR & RCC_CR_PLLRDY) == 0)
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{
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}
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/* Select PLL as system clock source */
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RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
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RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;
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/* Wait till PLL is used as system clock source */
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while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
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{
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}
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}
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else
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{ /* If HSE fails to start-up, the application will have wrong clock
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configuration. User can add here some code to deal with this error */
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}
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}
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#elif defined SYSCLK_FREQ_48MHz
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/**
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* @brief Sets System clock frequency to 48MHz and configure HCLK, PCLK2
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* and PCLK1 prescalers.
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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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static void SetSysClockTo48(void)
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{
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__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
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int nTime = 2;
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u16 i = 0;
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/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
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/* Enable HSE */
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RCC->CR |= ((uint32_t)RCC_CR_HSEON);
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/* Wait till HSE is ready and if Time out is reached exit */
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do
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{
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HSEStatus = RCC->CR & RCC_CR_HSERDY;
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StartUpCounter++;
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} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
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/* Software delay needs more than 2ms */
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while(nTime--)
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{
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i = 750;
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while(i--);
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}
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if ((RCC->CR & RCC_CR_HSERDY) != RESET)
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{
|
||
HSEStatus = (uint32_t)0x01;
|
||
}
|
||
else
|
||
{
|
||
HSEStatus = (uint32_t)0x00;
|
||
}
|
||
|
||
if (HSEStatus == (uint32_t)0x01)
|
||
{
|
||
/* Enable Prefetch Buffer */
|
||
FLASH->ACR |= FLASH_ACR_PRFTBE;
|
||
/* Flash 0 wait state ,bit0~2*/
|
||
FLASH->ACR &= ~0x07;
|
||
FLASH->ACR |=0x02;
|
||
/* HCLK = SYSCLK */
|
||
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
|
||
|
||
/* PCLK2 = HCLK */
|
||
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
|
||
|
||
/* PCLK1 = HCLK */
|
||
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2;
|
||
|
||
/* PLL configuration: = (HSE ) * (5+1) = 48MHz */
|
||
RCC->CFGR &= (uint32_t)0xFFFCFFFF;
|
||
RCC->CR &= (uint32_t)0x000FFFFF;
|
||
|
||
RCC->CFGR |= (uint32_t ) RCC_CFGR_PLLSRC ;
|
||
RCC->CR |= 0x14000000;//pll = 6/1
|
||
|
||
/* Enable PLL */
|
||
RCC->CR |= RCC_CR_PLLON;
|
||
|
||
/* Wait till PLL is ready */
|
||
while((RCC->CR & RCC_CR_PLLRDY) == 0)
|
||
{
|
||
}
|
||
|
||
/* Select PLL as system clock source */
|
||
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
|
||
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;
|
||
|
||
/* Wait till PLL is used as system clock source */
|
||
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
|
||
{
|
||
}
|
||
}
|
||
else
|
||
{ /* If HSE fails to start-up, the application will have wrong clock
|
||
configuration. User can add here some code to deal with this error */
|
||
}
|
||
}
|
||
|
||
#elif defined SYSCLK_HSI_24MHz
|
||
void SetSysClockTo24_HSI()
|
||
{
|
||
unsigned char temp=0;
|
||
|
||
RCC->CR|=RCC_CR_HSION;
|
||
while(!(RCC->CR&RCC_CR_HSIRDY));
|
||
RCC->CFGR=RCC_CFGR_PPRE1_2; //APB1=DIV2;APB2=DIV1;AHB=DIV1;
|
||
|
||
RCC->CFGR&=~RCC_CFGR_PLLSRC; //PLLSRC ON
|
||
|
||
RCC->CR &=~(RCC_CR_PLLON); //<2F><>PLL// RCC->CR &=~(7<<20); //<2F><>PLL
|
||
|
||
RCC->CR &=~(0x1f<<26);
|
||
RCC->CR|=(2 - 1) << 26; //<2F><><EFBFBD><EFBFBD>PLLֵ 2~16
|
||
|
||
FLASH->ACR=FLASH_ACR_PRFTBE; //FLASH 0<><30><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>
|
||
|
||
RCC->CR|=RCC_CR_PLLON; //PLLON
|
||
while(!(RCC->CR&RCC_CR_PLLRDY));//<2F>ȴ<EFBFBD>PLL<4C><4C><EFBFBD><EFBFBD>
|
||
RCC->CFGR&=~RCC_CFGR_SW;
|
||
RCC->CFGR|=RCC_CFGR_SW_PLL;//PLL<4C><4C>Ϊϵͳʱ<CDB3><CAB1>
|
||
while(temp!=0x02) //<2F>ȴ<EFBFBD>PLL<4C><4C>Ϊϵͳʱ<CDB3><CAB1><EFBFBD><EFBFBD><EFBFBD>óɹ<C3B3>
|
||
{
|
||
temp=RCC->CFGR>>2;
|
||
temp&=0x03;
|
||
}
|
||
}
|
||
|
||
#elif defined SYSCLK_HSI_36MHz
|
||
void SetSysClockTo36_HSI()
|
||
{
|
||
unsigned char temp=0;
|
||
|
||
RCC->CR|=RCC_CR_HSION;
|
||
while(!(RCC->CR&RCC_CR_HSIRDY));
|
||
RCC->CFGR=RCC_CFGR_PPRE1_2; //APB1=DIV2;APB2=DIV1;AHB=DIV1;
|
||
|
||
RCC->CFGR&=~RCC_CFGR_PLLSRC; //PLLSRC ON
|
||
|
||
RCC->CR &=~(RCC_CR_PLLON); //<2F><>PLL// RCC->CR &=~(7<<20); //<2F><>PLL
|
||
|
||
RCC->CR &=~(0x1f<<26);
|
||
RCC->CR|=(3 - 1) << 26; //<2F><><EFBFBD><EFBFBD>PLLֵ 2~16
|
||
|
||
FLASH->ACR=FLASH_ACR_LATENCY_1|FLASH_ACR_PRFTBE; //FLASH 1<><31><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>
|
||
|
||
RCC->CR|=RCC_CR_PLLON; //PLLON
|
||
while(!(RCC->CR&RCC_CR_PLLRDY));//<2F>ȴ<EFBFBD>PLL<4C><4C><EFBFBD><EFBFBD>
|
||
RCC->CFGR&=~RCC_CFGR_SW;
|
||
RCC->CFGR|=RCC_CFGR_SW_PLL;//PLL<4C><4C>Ϊϵͳʱ<CDB3><CAB1>
|
||
while(temp!=0x02) //<2F>ȴ<EFBFBD>PLL<4C><4C>Ϊϵͳʱ<CDB3><CAB1><EFBFBD><EFBFBD><EFBFBD>óɹ<C3B3>
|
||
{
|
||
temp=RCC->CFGR>>2;
|
||
temp&=0x03;
|
||
}
|
||
}
|
||
|
||
#elif defined SYSCLK_HSI_48MHz
|
||
void SetSysClockTo48_HSI()
|
||
{
|
||
unsigned char temp=0;
|
||
|
||
RCC->CR|=RCC_CR_HSION;
|
||
while(!(RCC->CR&RCC_CR_HSIRDY));
|
||
RCC->CFGR=RCC_CFGR_PPRE1_2; //APB1=DIV2;APB2=DIV1;AHB=DIV1;
|
||
|
||
RCC->CFGR&=~RCC_CFGR_PLLSRC; //PLLSRC ON
|
||
|
||
RCC->CR &=~(RCC_CR_PLLON); //<2F><>PLL// RCC->CR &=~(7<<20); //<2F><>PLL
|
||
|
||
RCC->CR &=~(0x1f<<26);
|
||
RCC->CR|=(4 - 1) << 26; //<2F><><EFBFBD><EFBFBD>PLLֵ 2~16
|
||
|
||
FLASH->ACR=FLASH_ACR_LATENCY_1|FLASH_ACR_PRFTBE; //FLASH 1<><31><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>
|
||
|
||
RCC->CR|=RCC_CR_PLLON; //PLLON
|
||
while(!(RCC->CR&RCC_CR_PLLRDY));//<2F>ȴ<EFBFBD>PLL<4C><4C><EFBFBD><EFBFBD>
|
||
RCC->CFGR&=~RCC_CFGR_SW;
|
||
RCC->CFGR|=RCC_CFGR_SW_PLL;//PLL<4C><4C>Ϊϵͳʱ<CDB3><CAB1>
|
||
while(temp!=0x02) //<2F>ȴ<EFBFBD>PLL<4C><4C>Ϊϵͳʱ<CDB3><CAB1><EFBFBD><EFBFBD><EFBFBD>óɹ<C3B3>
|
||
{
|
||
temp=RCC->CFGR>>2;
|
||
temp&=0x03;
|
||
}
|
||
}
|
||
|
||
#endif
|
||
|
||
/**
|
||
* @}
|
||
*/
|
||
|
||
/**
|
||
* @}
|
||
*/
|
||
|
||
/**
|
||
* @}
|
||
*/
|
||
/*-------------------------(C) COPYRIGHT 2017 MindMotion ----------------------*/
|