Diff: targets/cmsis/TARGET_STM/TARGET_DISCO_F407VG/stm32f4xx_hal_rcc.c

Revision:

133:d4dda5c437f0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_DISCO_F407VG/stm32f4xx_hal_rcc.c	Mon Mar 24 17:45:07 2014 +0000
@@ -0,0 +1,1248 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_rcc.c
+  * @author  MCD Application Team
+  * @version V1.0.0
+  * @date    18-February-2014
+  * @brief   RCC HAL module driver.
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the Reset and Clock Control (RCC) peripheral:
+  *           + Initialization and de-initialization functions
+  *           + Peripheral Control functions
+  *       
+  @verbatim                
+  ==============================================================================
+                      ##### RCC specific features #####
+  ==============================================================================
+    [..]  
+      After reset the device is running from Internal High Speed oscillator 
+      (HSI 16MHz) with Flash 0 wait state, Flash prefetch buffer, D-Cache 
+      and I-Cache are disabled, and all peripherals are off except internal
+      SRAM, Flash and JTAG.
+      (+) There is no prescaler on High speed (AHB) and Low speed (APB) busses;
+          all peripherals mapped on these busses are running at HSI speed.
+      (+) The clock for all peripherals is switched off, except the SRAM and FLASH.
+      (+) All GPIOs are in input floating state, except the JTAG pins which
+          are assigned to be used for debug purpose.
+    
+    [..]          
+      Once the device started from reset, the user application has to:        
+      (+) Configure the clock source to be used to drive the System clock
+          (if the application needs higher frequency/performance)
+      (+) Configure the System clock frequency and Flash settings  
+      (+) Configure the AHB and APB busses prescalers
+      (+) Enable the clock for the peripheral(s) to be used
+      (+) Configure the clock source(s) for peripherals which clocks are not
+          derived from the System clock (I2S, RTC, ADC, USB OTG FS/SDIO/RNG)
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */ 
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f4xx_hal.h"
+
+/** @addtogroup STM32F4xx_HAL_Driver
+  * @{
+  */
+
+/** @defgroup RCC 
+  * @brief RCC HAL module driver
+  * @{
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+#define HSE_TIMEOUT_VALUE          HSE_STARTUP_TIMEOUT
+#define HSI_TIMEOUT_VALUE          ((uint32_t)100)  /* 100 ms */
+#define LSI_TIMEOUT_VALUE          ((uint32_t)100)  /* 100 ms */
+#define PLL_TIMEOUT_VALUE          ((uint32_t)100)  /* 100 ms */
+#define CLOCKSWITCH_TIMEOUT_VALUE  ((uint32_t)5000) /* 5 s    */
+
+/* Private macro -------------------------------------------------------------*/
+#define __MCO1_CLK_ENABLE()   __GPIOA_CLK_ENABLE()
+#define MCO1_GPIO_PORT        GPIOA
+#define MCO1_PIN              GPIO_PIN_8 
+
+#define __MCO2_CLK_ENABLE()   __GPIOC_CLK_ENABLE()
+#define MCO2_GPIO_PORT         GPIOC
+#define MCO2_PIN               GPIO_PIN_9
+
+/* Private variables ---------------------------------------------------------*/
+const uint8_t APBAHBPrescTable[16] = {0, 0, 0, 0, 1, 2, 3, 4, 1, 2, 3, 4, 6, 7, 8, 9};
+
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup RCC_Private_Functions
+  * @{
+  */
+
+/** @defgroup RCC_Group1 Initialization and de-initialization functions 
+ *  @brief    Initialization and Configuration functions 
+ *
+@verbatim    
+ ===============================================================================
+           ##### Initialization and de-initialization functions #####
+ ===============================================================================
+    [..]
+      This section provide functions allowing to configure the internal/external oscillators
+      (HSE, HSI, LSE, LSI, PLL, CSS and MCO) and the System busses clocks (SYSCLK, AHB, APB1 
+       and APB2).
+
+    [..] Internal/external clock and PLL configuration
+         (#) HSI (high-speed internal), 16 MHz factory-trimmed RC used directly or through
+             the PLL as System clock source.
+
+         (#) LSI (low-speed internal), 32 KHz low consumption RC used as IWDG and/or RTC
+             clock source.
+
+         (#) HSE (high-speed external), 4 to 26 MHz crystal oscillator used directly or
+             through the PLL as System clock source. Can be used also as RTC clock source.
+
+         (#) LSE (low-speed external), 32 KHz oscillator used as RTC clock source.   
+
+         (#) PLL (clocked by HSI or HSE), featuring two different output clocks:
+           (++) The first output is used to generate the high speed system clock (up to 168 MHz)
+           (++) The second output is used to generate the clock for the USB OTG FS (48 MHz),
+                the random analog generator (<=48 MHz) and the SDIO (<= 48 MHz).
+
+         (#) CSS (Clock security system), once enable using the macro __HAL_RCC_CSS_ENABLE()
+             and if a HSE clock failure occurs(HSE used directly or through PLL as System 
+             clock source), the System clockis automatically switched to HSI and an interrupt
+             is generated if enabled. The interrupt is linked to the Cortex-M4 NMI 
+             (Non-Maskable Interrupt) exception vector.   
+
+         (#) MCO1 (microcontroller clock output), used to output HSI, LSE, HSE or PLL
+             clock (through a configurable prescaler) on PA8 pin.
+
+         (#) MCO2 (microcontroller clock output), used to output HSE, PLL, SYSCLK or PLLI2S
+             clock (through a configurable prescaler) on PC9 pin.
+
+    [..] System, AHB and APB busses clocks configuration  
+         (#) Several clock sources can be used to drive the System clock (SYSCLK): HSI,
+             HSE and PLL.
+             The AHB clock (HCLK) is derived from System clock through configurable 
+             prescaler and used to clock the CPU, memory and peripherals mapped 
+             on AHB bus (DMA, GPIO...). APB1 (PCLK1) and APB2 (PCLK2) clocks are derived 
+             from AHB clock through configurable prescalers and used to clock 
+             the peripherals mapped on these busses. You can use 
+             "HAL_RCC_GetSysClockFreq()" function to retrieve the frequencies of these clocks.  
+
+         -@- All the peripheral clocks are derived from the System clock (SYSCLK) except:
+           (+@) I2S: the I2S clock can be derived either from a specific PLL (PLLI2S) or
+                from an external clock mapped on the I2S_CKIN pin. 
+                You have to use __HAL_RCC_PLLI2S_CONFIG() macro to configure this clock.
+          (+@) SAI: the SAI clock can be derived either from a specific PLL (PLLI2S) or (PLLSAI) or
+                from an external clock mapped on the I2S_CKIN pin. 
+                You have to use __HAL_RCC_PLLI2S_CONFIG() macro to configure this clock. 
+           (+@) RTC: the RTC clock can be derived either from the LSI, LSE or HSE clock
+                divided by 2 to 31. You have to use __HAL_RCC_RTC_CONFIG() and __HAL_RCC_RTC_ENABLE()
+                macros to configure this clock. 
+           (+@) USB OTG FS, SDIO and RTC: USB OTG FS require a frequency equal to 48 MHz
+                to work correctly, while the SDIO require a frequency equal or lower than
+                to 48. This clock is derived of the main PLL through PLLQ divider.
+           (+@) IWDG clock which is always the LSI clock.
+       
+         (#) For the STM32F405xx/07xx and STM32F415xx/17xx devices, the maximum
+             frequency of the SYSCLK and HCLK is 168 MHz, PCLK2 84 MHz and PCLK1 42 MHz. 
+             Depending on the device voltage range, the maximum frequency should
+             be adapted accordingly:
+ +-------------------------------------------------------------------------------------+
+ | Latency       |                HCLK clock frequency (MHz)                           |
+ |               |---------------------------------------------------------------------|
+ |               | voltage range  | voltage range  | voltage range   | voltage range   |
+ |               | 2.7 V - 3.6 V  | 2.4 V - 2.7 V  | 2.1 V - 2.4 V   | 1.8 V - 2.1 V   |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |0WS(1CPU cycle)|0 < HCLK <= 30  |0 < HCLK <= 24  |0 < HCLK <= 22   |0 < HCLK <= 20   |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |1WS(2CPU cycle)|30 < HCLK <= 60 |24 < HCLK <= 48 |22 < HCLK <= 44  |20 < HCLK <= 40  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |2WS(3CPU cycle)|60 < HCLK <= 90 |48 < HCLK <= 72 |44 < HCLK <= 66  |40 < HCLK <= 60  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |3WS(4CPU cycle)|90 < HCLK <= 120|72 < HCLK <= 96 |66 < HCLK <= 88  |60 < HCLK <= 80  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |4WS(5CPU cycle)|120< HCLK <= 150|96 < HCLK <= 120|88 < HCLK <= 110 |80 < HCLK <= 100 |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |5WS(6CPU cycle)|150< HCLK <= 168|120< HCLK <= 144|110 < HCLK <= 132|100 < HCLK <= 120|
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |6WS(7CPU cycle)|      NA        |144< HCLK <= 168|132 < HCLK <= 154|120 < HCLK <= 140|
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |7WS(8CPU cycle)|      NA        |      NA        |154 < HCLK <= 168|140 < HCLK <= 160|
+ +-------------------------------------------------------------------------------------+
+         (#) For the STM32F42xxx and STM32F43xxx devices, the maximum frequency
+             of the SYSCLK and HCLK is 180 MHz, PCLK2 90 MHz and PCLK1 45 MHz. 
+             Depending on the device voltage range, the maximum frequency should
+             be adapted accordingly:
+ +-------------------------------------------------------------------------------------+
+ | Latency       |                HCLK clock frequency (MHz)                           |
+ |               |---------------------------------------------------------------------|
+ |               | voltage range  | voltage range  | voltage range   | voltage range   |
+ |               | 2.7 V - 3.6 V  | 2.4 V - 2.7 V  | 2.1 V - 2.4 V   | 1.8 V - 2.1 V   |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |0WS(1CPU cycle)|0 < HCLK <= 30  |0 < HCLK <= 24  |0 < HCLK <= 22   |0 < HCLK <= 20   |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |1WS(2CPU cycle)|30 < HCLK <= 60 |24 < HCLK <= 48 |22 < HCLK <= 44  |20 < HCLK <= 40  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |2WS(3CPU cycle)|60 < HCLK <= 90 |48 < HCLK <= 72 |44 < HCLK <= 66  |40 < HCLK <= 60  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |3WS(4CPU cycle)|90 < HCLK <= 120|72 < HCLK <= 96 |66 < HCLK <= 88  |60 < HCLK <= 80  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |4WS(5CPU cycle)|120< HCLK <= 150|96 < HCLK <= 120|88 < HCLK <= 110 |80 < HCLK <= 100 |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |5WS(6CPU cycle)|150< HCLK <= 180|120< HCLK <= 144|110 < HCLK <= 132|100 < HCLK <= 120|
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |6WS(7CPU cycle)|      NA        |144< HCLK <= 168|132 < HCLK <= 154|120 < HCLK <= 140|
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |7WS(8CPU cycle)|      NA        |168< HCLK <= 180|154 < HCLK <= 176|140 < HCLK <= 160|
+ |-------------------------------------------------------------------------------------|
+ |8WS(9CPU cycle)|      NA        |       NA       |176 < HCLK <= 180|160 < HCLK <= 180|
+ +-------------------------------------------------------------------------------------+
+         (#) For the STM32F401xx, the maximum frequency of the SYSCLK and HCLK is 84 MHz,
+             PCLK2 84 MHz and PCLK1 42 MHz. 
+             Depending on the device voltage range, the maximum frequency should
+             be adapted accordingly:
+ +-------------------------------------------------------------------------------------+
+ | Latency       |                HCLK clock frequency (MHz)                           |
+ |               |---------------------------------------------------------------------|
+ |               | voltage range  | voltage range  | voltage range   | voltage range   |
+ |               | 2.7 V - 3.6 V  | 2.4 V - 2.7 V  | 2.1 V - 2.4 V   | 1.8 V - 2.1 V   |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |0WS(1CPU cycle)|0 < HCLK <= 30  |0 < HCLK <= 24  |0 < HCLK <= 22   |0 < HCLK <= 20   |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |1WS(2CPU cycle)|30 < HCLK <= 60 |24 < HCLK <= 48 |22 < HCLK <= 44  |20 < HCLK <= 40  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |2WS(3CPU cycle)|60 < HCLK <= 84 |48 < HCLK <= 72 |44 < HCLK <= 66  |40 < HCLK <= 60  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |3WS(4CPU cycle)|      NA        |72 < HCLK <= 84 |66 < HCLK <= 84  |60 < HCLK <= 80  |
+ |---------------|----------------|----------------|-----------------|-----------------|
+ |4WS(5CPU cycle)|      NA        |      NA        |      NA         |80 < HCLK <= 84  |
+ +-------------------------------------------------------------------------------------+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Resets the RCC clock configuration to the default reset state.
+  * @note   The default reset state of the clock configuration is given below:
+  *            - HSI ON and used as system clock source
+  *            - HSE, PLL and PLLI2S OFF
+  *            - AHB, APB1 and APB2 prescaler set to 1.
+  *            - CSS, MCO1 and MCO2 OFF
+  *            - All interrupts disabled
+  * @note   This function doesn't modify the configuration of the
+  *            - Peripheral clocks  
+  *            - LSI, LSE and RTC clocks 
+  * @param  None
+  * @retval None
+  */
+void HAL_RCC_DeInit(void)
+{
+  /* Set HSION bit */
+  SET_BIT(RCC->CR, RCC_CR_HSION | RCC_CR_HSITRIM_4); 
+  
+  /* Reset CFGR register */
+  CLEAR_REG(RCC->CFGR);
+  
+  /* Reset HSEON, CSSON, PLLON, PLLI2S */
+  CLEAR_BIT(RCC->CR, RCC_CR_HSEON | RCC_CR_CSSON | RCC_CR_PLLON| RCC_CR_PLLI2SON); 
+  
+  /* Reset PLLCFGR register */
+  CLEAR_REG(RCC->PLLCFGR);
+  SET_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLM_4 | RCC_PLLCFGR_PLLN_6 | RCC_PLLCFGR_PLLN_7 | RCC_PLLCFGR_PLLQ_2); 
+  
+  /* Reset PLLI2SCFGR register */
+  CLEAR_REG(RCC->PLLI2SCFGR);
+  SET_BIT(RCC->PLLI2SCFGR,  RCC_PLLI2SCFGR_PLLI2SN_6 | RCC_PLLI2SCFGR_PLLI2SN_7 | RCC_PLLI2SCFGR_PLLI2SR_1);
+  
+  /* Reset HSEBYP bit */
+  CLEAR_BIT(RCC->CR, RCC_CR_HSEBYP);
+  
+  /* Disable all interrupts */
+  CLEAR_REG(RCC->CIR); 
+}
+
+/**
+  * @brief  Initializes the RCC Oscillators according to the specified parameters in the
+  *         RCC_OscInitTypeDef.
+  * @param  RCC_OscInitStruct: pointer to an RCC_OscInitTypeDef structure that
+  *         contains the configuration information for the RCC Oscillators.
+  * @note   The PLL is not disabled when used as system clock.
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_RCC_OscConfig(RCC_OscInitTypeDef  *RCC_OscInitStruct)
+{
+
+  uint32_t timeout = 0;   
+ 
+  /* Check the parameters */
+  assert_param(IS_RCC_OSCILLATORTYPE(RCC_OscInitStruct->OscillatorType));
+  /*------------------------------- HSE Configuration ------------------------*/ 
+  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSE) == RCC_OSCILLATORTYPE_HSE)
+  {
+    /* Check the parameters */
+    assert_param(IS_RCC_HSE(RCC_OscInitStruct->HSEState));
+    /* When the HSE is used as system clock or clock source for PLL in these cases HSE will not disabled */
+    if((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_CFGR_SWS_HSE) || ((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_CFGR_SWS_PLL) && ((RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) == RCC_PLLCFGR_PLLSRC_HSE)))
+    {
+      if((__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) != RESET) && (RCC_OscInitStruct->HSEState != RCC_HSE_ON))
+      {
+        return HAL_ERROR;
+      }
+    }
+    else
+    {
+      /* Reset HSEON and HSEBYP bits before configuring the HSE --------------*/
+      __HAL_RCC_HSE_CONFIG(RCC_HSE_OFF);
+      
+      /* Get timeout */
+      timeout = HAL_GetTick() + HSE_TIMEOUT_VALUE;
+      
+      /* Wait till HSE is disabled */  
+      while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) != RESET)
+      {
+        if(HAL_GetTick() >= timeout)
+        {
+          return HAL_TIMEOUT;
+        }      
+      }
+      
+      /* Set the new HSE configuration ---------------------------------------*/
+      __HAL_RCC_HSE_CONFIG(RCC_OscInitStruct->HSEState);
+      
+      /* Check the HSE State */
+      if((RCC_OscInitStruct->HSEState) == RCC_HSE_ON)
+      {
+        /* Get timeout */
+        timeout = HAL_GetTick() + HSE_TIMEOUT_VALUE;
+      
+        /* Wait till HSE is ready */  
+        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }
+        }
+      }
+      else
+      {
+        /* Get timeout */
+        timeout = HAL_GetTick() + HSE_TIMEOUT_VALUE;
+
+        /* Wait till HSE is bypassed or disabled */
+        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) != RESET)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }
+        }
+      }
+    }
+  }
+  /*----------------------------- HSI Configuration --------------------------*/
+  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSI) == RCC_OSCILLATORTYPE_HSI)
+  {
+    /* Check the parameters */
+    assert_param(IS_RCC_HSI(RCC_OscInitStruct->HSIState));
+    assert_param(IS_RCC_CALIBRATION_VALUE(RCC_OscInitStruct->HSICalibrationValue));
+    
+    /* When the HSI is used as system clock it will not disabled */
+    if((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_CFGR_SWS_HSI) || ((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_CFGR_SWS_PLL) && ((RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) == RCC_PLLCFGR_PLLSRC_HSI)))
+    {
+      if((__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != RESET) && (RCC_OscInitStruct->HSIState != RCC_HSI_ON))
+      {
+        return HAL_ERROR;
+      }
+    }
+    else
+    {
+      /* Check the HSI State */
+      if((RCC_OscInitStruct->HSIState)!= RCC_HSI_OFF)
+      {
+        /* Enable the Internal High Speed oscillator (HSI). */
+        __HAL_RCC_HSI_ENABLE();
+
+        /* Get timeout */
+        timeout = HAL_GetTick() + HSI_TIMEOUT_VALUE;
+
+        /* Wait till HSI is ready */  
+        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == RESET)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }      
+        } 
+                
+        /* Adjusts the Internal High Speed oscillator (HSI) calibration value.*/
+        __HAL_RCC_HSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->HSICalibrationValue);
+      }
+      else
+      {
+        /* Disable the Internal High Speed oscillator (HSI). */
+        __HAL_RCC_HSI_DISABLE();
+
+        /* Get timeout */
+        timeout = HAL_GetTick() + HSI_TIMEOUT_VALUE;
+      
+        /* Wait till HSI is ready */  
+        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != RESET)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }
+        } 
+      }
+    }
+  }
+  /*------------------------------ LSI Configuration -------------------------*/
+  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSI) == RCC_OSCILLATORTYPE_LSI)
+  {
+    /* Check the parameters */
+    assert_param(IS_RCC_LSI(RCC_OscInitStruct->LSIState));
+
+    /* Check the LSI State */
+    if((RCC_OscInitStruct->LSIState)!= RCC_LSI_OFF)
+    {
+      /* Enable the Internal Low Speed oscillator (LSI). */
+      __HAL_RCC_LSI_ENABLE();
+
+      /* Get timeout */
+      timeout = HAL_GetTick() + LSI_TIMEOUT_VALUE;
+
+      /* Wait till LSI is ready */
+      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) == RESET)
+      {
+        if(HAL_GetTick() >= timeout)
+        {
+          return HAL_TIMEOUT;
+        }
+      }
+    }
+    else
+    {
+      /* Disable the Internal Low Speed oscillator (LSI). */
+      __HAL_RCC_LSI_DISABLE();
+
+      /* Get timeout */
+      timeout = HAL_GetTick() + LSI_TIMEOUT_VALUE;
+      
+      /* Wait till LSI is ready */  
+      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) != RESET)
+      {
+        if(HAL_GetTick() >= timeout)
+        {
+          return HAL_TIMEOUT;
+        }      
+      } 
+    }
+  }
+  /*------------------------------ LSE Configuration -------------------------*/ 
+  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSE) == RCC_OSCILLATORTYPE_LSE)
+  {
+    /* Check the parameters */
+    assert_param(IS_RCC_LSE(RCC_OscInitStruct->LSEState));
+    
+    /* Enable Power Clock*/
+    __PWR_CLK_ENABLE();
+    
+    /* Enable write access to Backup domain */
+    PWR->CR |= PWR_CR_DBP;
+    
+    /* Wait for Backup domain Write protection disable */
+    timeout = HAL_GetTick() + DBP_TIMEOUT_VALUE;
+    
+    while((PWR->CR & PWR_CR_DBP) == RESET)
+    {
+      if(HAL_GetTick() >= timeout)
+      {
+        return HAL_TIMEOUT;
+      }      
+    }
+
+    /* Reset LSEON and LSEBYP bits before configuring the LSE ----------------*/
+    __HAL_RCC_LSE_CONFIG(RCC_LSE_OFF);
+    
+    /* Get timeout */
+    timeout = HAL_GetTick() + LSE_TIMEOUT_VALUE;
+      
+    /* Wait till LSE is ready */  
+    while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) != RESET)
+    {
+      if(HAL_GetTick() >= timeout)
+      {
+        return HAL_TIMEOUT;
+      }      
+    } 
+    
+    /* Set the new LSE configuration -----------------------------------------*/
+    __HAL_RCC_LSE_CONFIG(RCC_OscInitStruct->LSEState);
+    /* Check the LSE State */
+    if((RCC_OscInitStruct->LSEState) == RCC_LSE_ON)
+    {
+      /* Get timeout */
+      timeout = HAL_GetTick() + LSE_TIMEOUT_VALUE;
+      
+      /* Wait till LSE is ready */  
+      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == RESET)
+      {
+        if(HAL_GetTick() >= timeout)
+        {
+          return HAL_TIMEOUT;
+        }      
+      }
+    }
+    else
+    {
+      /* Get timeout */
+      timeout = HAL_GetTick() + LSE_TIMEOUT_VALUE;
+      
+      /* Wait till LSE is ready */  
+      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) != RESET)
+      {
+        if(HAL_GetTick() >= timeout)
+        {
+          return HAL_TIMEOUT;
+        }      
+      }
+    }
+  }
+  /*-------------------------------- PLL Configuration -----------------------*/
+  /* Check the parameters */
+  assert_param(IS_RCC_PLL(RCC_OscInitStruct->PLL.PLLState));
+  if ((RCC_OscInitStruct->PLL.PLLState) != RCC_PLL_NONE)
+  {
+    /* Check if the PLL is used as system clock or not */
+    if(__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_PLL)
+    { 
+      if((RCC_OscInitStruct->PLL.PLLState) == RCC_PLL_ON)
+      {
+        /* Check the parameters */
+        assert_param(IS_RCC_PLLSOURCE(RCC_OscInitStruct->PLL.PLLSource));
+        assert_param(IS_RCC_PLLM_VALUE(RCC_OscInitStruct->PLL.PLLM));
+        assert_param(IS_RCC_PLLN_VALUE(RCC_OscInitStruct->PLL.PLLN));
+        assert_param(IS_RCC_PLLP_VALUE(RCC_OscInitStruct->PLL.PLLP));
+        assert_param(IS_RCC_PLLQ_VALUE(RCC_OscInitStruct->PLL.PLLQ));
+        
+        /* Disable the main PLL. */
+        __HAL_RCC_PLL_DISABLE();
+
+        /* Get timeout */
+        timeout = HAL_GetTick() + PLL_TIMEOUT_VALUE;
+      
+        /* Wait till PLL is ready */  
+        while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) != RESET)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }      
+        }        
+
+        /* Configure the main PLL clock source, multiplication and division factors. */
+        __HAL_RCC_PLL_CONFIG(RCC_OscInitStruct->PLL.PLLSource,
+                             RCC_OscInitStruct->PLL.PLLM,
+                             RCC_OscInitStruct->PLL.PLLN,
+                             RCC_OscInitStruct->PLL.PLLP,
+                             RCC_OscInitStruct->PLL.PLLQ);
+        /* Enable the main PLL. */
+        __HAL_RCC_PLL_ENABLE();
+
+        /* Get timeout */
+        timeout = HAL_GetTick() + PLL_TIMEOUT_VALUE;
+      
+        /* Wait till PLL is ready */  
+        while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }      
+        }
+      }
+      else
+      {
+        /* Disable the main PLL. */
+        __HAL_RCC_PLL_DISABLE();
+        /* Get timeout */
+        timeout = HAL_GetTick() + PLL_TIMEOUT_VALUE;
+      
+        /* Wait till PLL is ready */  
+        while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) != RESET)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }      
+        }
+      }
+    }
+    else
+    {
+      return HAL_ERROR;
+    }
+  }
+  return HAL_OK;
+}
+ 
+/**
+  * @brief  Initializes the CPU, AHB and APB busses clocks according to the specified 
+  *         parameters in the RCC_ClkInitStruct.
+  * @param  RCC_ClkInitStruct: pointer to an RCC_OscInitTypeDef structure that
+  *         contains the configuration information for the RCC peripheral.
+  * @param  FLatency: FLASH Latency, this parameter depend on device selected
+  * 
+  * @note   The SystemCoreClock CMSIS variable is used to store System Clock Frequency 
+  *         and updated by HAL_RCC_GetHCLKFreq() function called within this function
+  *
+  * @note   The HSI is used (enabled by hardware) as system clock source after
+  *         startup from Reset, wake-up from STOP and STANDBY mode, or in case
+  *         of failure of the HSE used directly or indirectly as system clock
+  *         (if the Clock Security System CSS is enabled).
+  *           
+  * @note   A switch from one clock source to another occurs only if the target
+  *         clock source is ready (clock stable after startup delay or PLL locked). 
+  *         If a clock source which is not yet ready is selected, the switch will
+  *         occur when the clock source will be ready. 
+  *           
+  * @note   Depending on the device voltage range, the software has to set correctly
+  *         HPRE[3:0] bits to ensure that HCLK not exceed the maximum allowed frequency
+  *         (for more details refer to section above "Initialization/de-initialization functions")
+  * @retval None
+  */
+HAL_StatusTypeDef HAL_RCC_ClockConfig(RCC_ClkInitTypeDef  *RCC_ClkInitStruct, uint32_t FLatency)
+{
+
+  uint32_t timeout = 0;   
+ 
+  /* Check the parameters */
+  assert_param(IS_RCC_CLOCKTYPE(RCC_ClkInitStruct->ClockType));
+  assert_param(IS_FLASH_LATENCY(FLatency));
+ 
+  /* To correctly read data from FLASH memory, the number of wait states (LATENCY) 
+    must be correctly programmed according to the frequency of the CPU clock 
+    (HCLK) and the supply voltage of the device. */
+  
+  /* Increasing the CPU frequency */
+  if(FLatency > (FLASH->ACR & FLASH_ACR_LATENCY))
+  {    
+    /* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */
+    __HAL_FLASH_SET_LATENCY(FLatency);
+    
+    /* Check that the new number of wait states is taken into account to access the Flash
+    memory by reading the FLASH_ACR register */
+    if((FLASH->ACR & FLASH_ACR_LATENCY) != FLatency)
+    {
+      return HAL_ERROR;
+    }
+
+    /*------------------------- SYSCLK Configuration ---------------------------*/ 
+    if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_SYSCLK) == RCC_CLOCKTYPE_SYSCLK)
+    {    
+      assert_param(IS_RCC_SYSCLKSOURCE(RCC_ClkInitStruct->SYSCLKSource));
+      
+      /* HSE is selected as System Clock Source */
+      if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE)
+      {
+        /* Check the HSE ready flag */  
+        if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET)
+        {
+          return HAL_ERROR;
+        }
+      }
+      /* PLL is selected as System Clock Source */
+      else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK)
+      {
+        /* Check the PLL ready flag */  
+        if(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET)
+        {
+          return HAL_ERROR;
+        }
+      }
+      /* HSI is selected as System Clock Source */
+      else
+      {
+        /* Check the HSI ready flag */  
+        if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == RESET)
+        {
+          return HAL_ERROR;
+        }
+      }
+      MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, RCC_ClkInitStruct->SYSCLKSource);
+ 
+      /* Get timeout */
+      timeout = HAL_GetTick() + CLOCKSWITCH_TIMEOUT_VALUE;
+      
+      if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE)
+      {
+        while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_HSE)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          } 
+        }
+      }
+      else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK)
+      {
+        while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_PLL)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          } 
+        }
+      }
+      else
+      {
+        while(__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_HSI)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }
+        }
+      }
+    }    
+  }
+  /* Decreasing the CPU frequency */
+  else
+  {
+    /*------------------------- SYSCLK Configuration ---------------------------*/ 
+    if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_SYSCLK) == RCC_CLOCKTYPE_SYSCLK)
+    {    
+      assert_param(IS_RCC_SYSCLKSOURCE(RCC_ClkInitStruct->SYSCLKSource));
+      
+      /* HSE is selected as System Clock Source */
+      if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE)
+      {
+        /* Check the HSE ready flag */  
+        if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET)
+        {
+          return HAL_ERROR;
+        }
+      }
+      /* PLL is selected as System Clock Source */
+      else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK)
+      {
+        /* Check the PLL ready flag */  
+        if(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET)
+        {
+          return HAL_ERROR;
+        }
+      }
+      /* HSI is selected as System Clock Source */
+      else
+      {
+        /* Check the HSI ready flag */  
+        if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == RESET)
+        {
+          return HAL_ERROR;
+        }
+      }
+      MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, RCC_ClkInitStruct->SYSCLKSource);
+      
+      /* Get timeout */
+      timeout = HAL_GetTick() + CLOCKSWITCH_TIMEOUT_VALUE;
+      
+      if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE)
+      {
+        while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_HSE)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          } 
+        }
+      }
+      else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK)
+      {
+        while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_PLL)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          } 
+        }
+      }
+      else
+      {
+        while(__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_CFGR_SWS_HSI)
+        {
+          if(HAL_GetTick() >= timeout)
+          {
+            return HAL_TIMEOUT;
+          }  
+        }
+      }
+    }
+    
+    /* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */
+    __HAL_FLASH_SET_LATENCY(FLatency);
+    
+    /* Check that the new number of wait states is taken into account to access the Flash
+    memory by reading the FLASH_ACR register */
+    if((FLASH->ACR & FLASH_ACR_LATENCY) != FLatency)
+    {
+      return HAL_ERROR;
+    }
+ }
+  
+  /*-------------------------- HCLK Configuration ----------------------------*/ 
+  if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_HCLK) == RCC_CLOCKTYPE_HCLK)
+  {
+    assert_param(IS_RCC_HCLK(RCC_ClkInitStruct->AHBCLKDivider));
+    MODIFY_REG(RCC->CFGR, RCC_CFGR_HPRE, RCC_ClkInitStruct->AHBCLKDivider);
+  }
+  
+  /*-------------------------- PCLK1 Configuration ---------------------------*/ 
+  if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_PCLK1) == RCC_CLOCKTYPE_PCLK1)
+  {
+    assert_param(IS_RCC_PCLK(RCC_ClkInitStruct->APB1CLKDivider));
+    MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE1, RCC_ClkInitStruct->APB1CLKDivider);
+  }
+  
+  /*-------------------------- PCLK2 Configuration ---------------------------*/ 
+  if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_PCLK2) == RCC_CLOCKTYPE_PCLK2)
+  {
+    assert_param(IS_RCC_PCLK(RCC_ClkInitStruct->APB2CLKDivider));
+    MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE2, ((RCC_ClkInitStruct->APB2CLKDivider) << 3));
+  }
+
+  /* Setup SysTick Timer for 1 msec interrupts.
+     ------------------------------------------
+    The SysTick_Config() function is a CMSIS function which configure:
+       - The SysTick Reload register with value passed as function parameter.
+       - Configure the SysTick IRQ priority to the lowest value (0x0F).
+       - Reset the SysTick Counter register.
+       - Configure the SysTick Counter clock source to be Core Clock Source (HCLK).
+       - Enable the SysTick Interrupt.
+       - Start the SysTick Counter.*/
+  SysTick_Config(HAL_RCC_GetHCLKFreq() / 1000);
+  
+  return HAL_OK;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup RCC_Group2 Peripheral Control functions 
+ *  @brief   RCC clocks control functions 
+ *
+@verbatim   
+ ===============================================================================
+                      ##### Peripheral Control functions #####
+ ===============================================================================  
+    [..]
+    This subsection provides a set of functions allowing to control the RCC Clocks 
+    frequencies.
+      
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Selects the clock source to output on MCO1 pin(PA8) or on MCO2 pin(PC9).
+  * @note   PA8/PC9 should be configured in alternate function mode.
+  * @param  RCC_MCOx: specifies the output direction for the clock source.
+  *          This parameter can be one of the following values:
+  *            @arg RCC_MCO1: Clock source to output on MCO1 pin(PA8).
+  *            @arg RCC_MCO2: Clock source to output on MCO2 pin(PC9).
+  * @param  RCC_MCOSource: specifies the clock source to output.
+  *          This parameter can be one of the following values:
+  *            @arg RCC_MCO1SOURCE_HSI: HSI clock selected as MCO1 source
+  *            @arg RCC_MCO1SOURCE_LSE: LSE clock selected as MCO1 source
+  *            @arg RCC_MCO1SOURCE_HSE: HSE clock selected as MCO1 source
+  *            @arg RCC_MCO1SOURCE_PLLCLK: main PLL clock selected as MCO1 source
+  *            @arg RCC_MCO2SOURCE_SYSCLK: System clock (SYSCLK) selected as MCO2 source
+  *            @arg RCC_MCO2SOURCE_PLLI2SCLK: PLLI2S clock selected as MCO2 source
+  *            @arg RCC_MCO2SOURCE_HSE: HSE clock selected as MCO2 source
+  *            @arg RCC_MCO2SOURCE_PLLCLK: main PLL clock selected as MCO2 source
+  * @param  RCC_MCODiv: specifies the MCOx prescaler.
+  *          This parameter can be one of the following values:
+  *            @arg RCC_MCODIV_1: no division applied to MCOx clock
+  *            @arg RCC_MCODIV_2: division by 2 applied to MCOx clock
+  *            @arg RCC_MCODIV_3: division by 3 applied to MCOx clock
+  *            @arg RCC_MCODIV_4: division by 4 applied to MCOx clock
+  *            @arg RCC_MCODIV_5: division by 5 applied to MCOx clock
+  * @retval None
+  */
+void HAL_RCC_MCOConfig(uint32_t RCC_MCOx, uint32_t RCC_MCOSource, uint32_t RCC_MCODiv)
+{
+  GPIO_InitTypeDef GPIO_InitStruct;
+  /* Check the parameters */
+  assert_param(IS_RCC_MCO(RCC_MCOx));
+  assert_param(IS_RCC_MCODIV(RCC_MCODiv));
+  /* RCC_MCO1 */
+  if(RCC_MCOx == RCC_MCO1)
+  {
+    assert_param(IS_RCC_MCO1SOURCE(RCC_MCOSource));
+    
+    /* MCO1 Clock Enable */
+    __MCO1_CLK_ENABLE();
+    
+    /* Configue the MCO1 pin in alternate function mode */    
+    GPIO_InitStruct.Pin = MCO1_PIN;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Alternate = GPIO_AF0_MCO;
+    HAL_GPIO_Init(MCO1_GPIO_PORT, &GPIO_InitStruct);
+    
+    /* Mask MCO1 and MCO1PRE[2:0] bits then Select MCO1 clock source and prescaler */
+    MODIFY_REG(RCC->CFGR, (RCC_CFGR_MCO1 | RCC_CFGR_MCO1PRE), (RCC_MCOSource | RCC_MCODiv));
+  }
+  else
+  {
+    assert_param(IS_RCC_MCO2SOURCE(RCC_MCOSource));
+    
+    /* MCO2 Clock Enable */
+    __MCO2_CLK_ENABLE();
+    
+    /* Configue the MCO2 pin in alternate function mode */
+    GPIO_InitStruct.Pin = MCO2_PIN;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Alternate = GPIO_AF0_MCO;
+    HAL_GPIO_Init(MCO2_GPIO_PORT, &GPIO_InitStruct);
+    
+    /* Mask MCO2 and MCO2PRE[2:0] bits then Select MCO2 clock source and prescaler */
+    MODIFY_REG(RCC->CFGR, (RCC_CFGR_MCO2 | RCC_CFGR_MCO2PRE), (RCC_MCOSource | (RCC_MCODiv << 3)));
+  }
+}
+
+/**
+  * @brief  Enables the Clock Security System.
+  * @note   If a failure is detected on the HSE oscillator clock, this oscillator
+  *         is automatically disabled and an interrupt is generated to inform the
+  *         software about the failure (Clock Security System Interrupt, CSSI),
+  *         allowing the MCU to perform rescue operations. The CSSI is linked to 
+  *         the Cortex-M4 NMI (Non-Maskable Interrupt) exception vector.  
+  * @param  None
+  * @retval None
+  */
+void HAL_RCC_EnableCSS(void)
+{
+  *(__IO uint32_t *) CR_CSSON_BB = (uint32_t)ENABLE;
+}
+
+/**
+  * @brief  Disables the Clock Security System.
+  * @param  None
+  * @retval None
+  */
+void HAL_RCC_DisableCSS(void)
+{
+  *(__IO uint32_t *) CR_CSSON_BB = (uint32_t)DISABLE;
+}
+
+/**
+  * @brief  Returns the SYSCLK frequency
+  *        
+  * @note   The system frequency computed by this function is not the real 
+  *         frequency in the chip. It is calculated based on the predefined 
+  *         constant and the selected clock source:
+  * @note     If SYSCLK source is HSI, function returns values based on HSI_VALUE(*)
+  * @note     If SYSCLK source is HSE, function returns values based on HSE_VALUE(**)
+  * @note     If SYSCLK source is PLL, function returns values based on HSE_VALUE(**) 
+  *           or HSI_VALUE(*) multiplied/divided by the PLL factors.         
+  * @note     (*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.h file (default value
+  *               16 MHz) but the real value may vary depending on the variations
+  *               in voltage and temperature.
+  * @note     (**) HSE_VALUE is a constant defined in stm32f4xx_hal_conf.h file (default value
+  *                25 MHz), user has to ensure that HSE_VALUE is same as the real
+  *                frequency of the crystal used. Otherwise, this function may
+  *                have wrong result.
+  *                  
+  * @note   The result of this function could be not correct when using fractional
+  *         value for HSE crystal.
+  *           
+  * @note   This function can be used by the user application to compute the 
+  *         baudrate for the communication peripherals or configure other parameters.
+  *           
+  * @note   Each time SYSCLK changes, this function must be called to update the
+  *         right SYSCLK value. Otherwise, any configuration based on this function will be incorrect.
+  *         
+  *               
+  * @param  None
+  * @retval SYSCLK frequency
+  */
+uint32_t HAL_RCC_GetSysClockFreq(void)
+{
+  uint32_t pllm = 0, pllvco = 0, pllp = 0;
+  uint32_t sysclockfreq = 0;
+
+  /* Get SYSCLK source -------------------------------------------------------*/
+  switch (RCC->CFGR & RCC_CFGR_SWS)
+  {
+    case RCC_CFGR_SWS_HSI:  /* HSI used as system clock source */
+    {
+      sysclockfreq = HSI_VALUE;
+       break;
+    }
+    case RCC_CFGR_SWS_HSE:  /* HSE used as system clock  source */
+    {
+      sysclockfreq = HSE_VALUE;
+      break;
+    }
+    case RCC_CFGR_SWS_PLL:  /* PLL used as system clock  source */
+    {
+      /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLLM) * PLLN
+      SYSCLK = PLL_VCO / PLLP */
+      pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM;
+      if (__RCC_PLLSRC() != 0)
+      {
+        /* HSE used as PLL clock source */
+        pllvco = ((HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN)));
+      }
+      else
+      {
+        /* HSI used as PLL clock source */
+        pllvco = ((HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN)));    
+      }
+      pllp = ((((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >> POSITION_VAL(RCC_PLLCFGR_PLLP)) + 1 ) *2);
+      
+      sysclockfreq = pllvco/pllp;
+      break;
+    }
+    default:
+    {
+      sysclockfreq = HSI_VALUE;
+      break;
+    }
+  }
+  return sysclockfreq;
+}
+
+/**
+  * @brief  Returns the HCLK frequency     
+  * @note   Each time HCLK changes, this function must be called to update the
+  *         right HCLK value. Otherwise, any configuration based on this function will be incorrect.
+  * 
+  * @note   The SystemCoreClock CMSIS variable is used to store System Clock Frequency 
+  *         and updated within this function
+  * @param  None
+  * @retval HCLK frequency
+  */
+uint32_t HAL_RCC_GetHCLKFreq(void)
+{
+  SystemCoreClock = HAL_RCC_GetSysClockFreq() >> APBAHBPrescTable[(RCC->CFGR & RCC_CFGR_HPRE)>> POSITION_VAL(RCC_CFGR_HPRE)];
+  return SystemCoreClock;
+}
+
+/**
+  * @brief  Returns the PCLK1 frequency     
+  * @note   Each time PCLK1 changes, this function must be called to update the
+  *         right PCLK1 value. Otherwise, any configuration based on this function will be incorrect.
+  * @param  None
+  * @retval PCLK1 frequency
+  */
+uint32_t HAL_RCC_GetPCLK1Freq(void)
+{  
+  /* Get HCLK source and Compute PCLK1 frequency ---------------------------*/
+  return (HAL_RCC_GetHCLKFreq() >> APBAHBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE1)>> POSITION_VAL(RCC_CFGR_PPRE1)]);
+}
+
+/**
+  * @brief  Returns the PCLK2 frequency     
+  * @note   Each time PCLK2 changes, this function must be called to update the
+  *         right PCLK2 value. Otherwise, any configuration based on this function will be incorrect.
+  * @param  None
+  * @retval PCLK2 frequency
+  */
+uint32_t HAL_RCC_GetPCLK2Freq(void)
+{
+  /* Get HCLK source and Compute PCLK2 frequency ---------------------------*/
+  return (HAL_RCC_GetHCLKFreq()>> APBAHBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE2)>> POSITION_VAL(RCC_CFGR_PPRE2)]);
+} 
+
+/**
+  * @brief  Configures the RCC_OscInitStruct according to the internal 
+  * RCC configuration registers.
+  * @param  RCC_OscInitStruct: pointer to an RCC_OscInitTypeDef structure that 
+  * will be configured.
+  * @retval None
+  */
+void HAL_RCC_GetOscConfig(RCC_OscInitTypeDef  *RCC_OscInitStruct)
+{
+  /* Set all possible values for the Oscillator type parameter ---------------*/
+  RCC_OscInitStruct->OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSE | RCC_OSCILLATORTYPE_LSI;
+  
+  /* Get the HSE configuration -----------------------------------------------*/
+  if((RCC->CR &RCC_CR_HSEBYP) == RCC_CR_HSEBYP)
+  {
+    RCC_OscInitStruct->HSEState = RCC_HSE_BYPASS;
+  }
+  else if((RCC->CR &RCC_CR_HSEON) == RCC_CR_HSEON)
+  {
+    RCC_OscInitStruct->HSEState = RCC_HSE_ON;
+  }
+  else
+  {
+    RCC_OscInitStruct->HSEState = RCC_HSE_OFF;
+  }
+  
+  /* Get the HSI configuration -----------------------------------------------*/
+  if((RCC->CR &RCC_CR_HSION) == RCC_CR_HSION)
+  {
+    RCC_OscInitStruct->HSIState = RCC_HSI_ON;
+  }
+  else
+  {
+    RCC_OscInitStruct->HSIState = RCC_HSI_OFF;
+  }
+  
+  RCC_OscInitStruct->HSICalibrationValue = (uint32_t)((RCC->CR &RCC_CR_HSITRIM) >> POSITION_VAL(RCC_CR_HSITRIM));
+  
+  /* Get the LSE configuration -----------------------------------------------*/
+  if((RCC->BDCR &RCC_BDCR_LSEBYP) == RCC_BDCR_LSEBYP)
+  {
+    RCC_OscInitStruct->LSEState = RCC_LSE_BYPASS;
+  }
+  else if((RCC->BDCR &RCC_BDCR_LSEON) == RCC_BDCR_LSEON)
+  {
+    RCC_OscInitStruct->LSEState = RCC_LSE_ON;
+  }
+  else
+  {
+    RCC_OscInitStruct->LSEState = RCC_LSE_OFF;
+  }
+  
+  /* Get the LSI configuration -----------------------------------------------*/
+  if((RCC->CSR &RCC_CSR_LSION) == RCC_CSR_LSION)
+  {
+    RCC_OscInitStruct->LSIState = RCC_LSI_ON;
+  }
+  else
+  {
+    RCC_OscInitStruct->LSIState = RCC_LSI_OFF;
+  }
+  
+  /* Get the PLL configuration -----------------------------------------------*/
+  if((RCC->CR &RCC_CR_PLLON) == RCC_CR_PLLON)
+  {
+    RCC_OscInitStruct->PLL.PLLState = RCC_PLL_ON;
+  }
+  else
+  {
+    RCC_OscInitStruct->PLL.PLLState = RCC_PLL_OFF;
+  }
+  RCC_OscInitStruct->PLL.PLLSource = (uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC);
+  RCC_OscInitStruct->PLL.PLLM = (uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLM);
+  RCC_OscInitStruct->PLL.PLLN = (uint32_t)((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN));
+  RCC_OscInitStruct->PLL.PLLP = (uint32_t)((((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) + RCC_PLLCFGR_PLLP_0) << 1) >> POSITION_VAL(RCC_PLLCFGR_PLLP));
+  RCC_OscInitStruct->PLL.PLLQ = (uint32_t)((RCC->PLLCFGR & RCC_PLLCFGR_PLLQ) >> POSITION_VAL(RCC_PLLCFGR_PLLQ));
+}
+
+/**
+  * @brief  Configures the RCC_ClkInitStruct according to the internal 
+  * RCC configuration registers.
+  * @param  RCC_OscInitStruct: pointer to an RCC_ClkInitTypeDef structure that 
+  * will be configured.
+  * @param  pFLatency: Pointer on the Flash Latency.
+  * @retval None
+  */
+void HAL_RCC_GetClockConfig(RCC_ClkInitTypeDef  *RCC_ClkInitStruct, uint32_t *pFLatency)
+{
+  /* Set all possible values for the Clock type parameter --------------------*/
+  RCC_ClkInitStruct->ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
+   
+  /* Get the SYSCLK configuration --------------------------------------------*/ 
+  RCC_ClkInitStruct->SYSCLKSource = (uint32_t)(RCC->CFGR & RCC_CFGR_SW);
+  
+  /* Get the HCLK configuration ----------------------------------------------*/ 
+  RCC_ClkInitStruct->AHBCLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_HPRE); 
+  
+  /* Get the APB1 configuration ----------------------------------------------*/ 
+  RCC_ClkInitStruct->APB1CLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_PPRE1);   
+  
+  /* Get the APB2 configuration ----------------------------------------------*/ 
+  RCC_ClkInitStruct->APB2CLKDivider = (uint32_t)((RCC->CFGR & RCC_CFGR_PPRE2) >> 3);
+  
+  /* Get the Flash Wait State (Latency) configuration ------------------------*/   
+  *pFLatency = (uint32_t)(FLASH->ACR & FLASH_ACR_LATENCY); 
+}
+
+/**
+  * @brief This function handles the RCC CSS interrupt request.
+  * @note This API should be called under the NMI_Handler().
+  * @param None
+  * @retval None
+  */
+void HAL_RCC_NMI_IRQHandler(void)
+{
+  /* Check RCC CSSF flag  */
+  if(__HAL_RCC_GET_IT(RCC_IT_CSS))
+  {
+    /* RCC Clock Security System interrupt user callback */
+    HAL_RCC_CCSCallback();
+
+    /* Clear RCC CSS pending bit */
+    __HAL_RCC_CLEAR_IT(RCC_IT_CSS);
+  }
+}
+
+/**
+  * @brief  RCC Clock Security System interrupt callback
+  * @param  none 
+  * @retval none
+  */
+__weak void HAL_RCC_CCSCallback(void)
+{
+  /* NOTE : This function Should not be modified, when the callback is needed,
+            the HAL_RCC_CCSCallback could be implemented in the user file
+   */ 
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* HAL_RCC_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/