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stm32l4xx_hal.c

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00001 /**
00002   ******************************************************************************
00003   * @file    stm32l4xx_hal.c
00004   * @author  MCD Application Team
00005   * @version V1.1.0
00006   * @date    16-September-2015
00007   * @brief   HAL module driver.
00008   *          This is the common part of the HAL initialization
00009   *
00010   @verbatim
00011   ==============================================================================
00012                      ##### How to use this driver #####
00013   ==============================================================================
00014     [..]
00015     The common HAL driver contains a set of generic and common APIs that can be
00016     used by the PPP peripheral drivers and the user to start using the HAL.
00017     [..]
00018     The HAL contains two APIs' categories:
00019          (+) Common HAL APIs
00020          (+) Services HAL APIs
00021 
00022   @endverbatim
00023   ******************************************************************************
00024   * @attention
00025   *
00026   * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
00027   *
00028   * Redistribution and use in source and binary forms, with or without modification,
00029   * are permitted provided that the following conditions are met:
00030   *   1. Redistributions of source code must retain the above copyright notice,
00031   *      this list of conditions and the following disclaimer.
00032   *   2. Redistributions in binary form must reproduce the above copyright notice,
00033   *      this list of conditions and the following disclaimer in the documentation
00034   *      and/or other materials provided with the distribution.
00035   *   3. Neither the name of STMicroelectronics nor the names of its contributors
00036   *      may be used to endorse or promote products derived from this software
00037   *      without specific prior written permission.
00038   *
00039   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00040   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00041   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00042   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00043   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00044   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00045   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00046   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00047   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00048   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00049   *
00050   ******************************************************************************
00051   */
00052 
00053 /* Includes ------------------------------------------------------------------*/
00054 #include "stm32l4xx_hal.h"
00055 
00056 /** @addtogroup STM32L4xx_HAL_Driver
00057   * @{
00058   */
00059 
00060 /** @defgroup HAL HAL
00061   * @brief HAL module driver
00062   * @{
00063   */
00064 
00065 #ifdef HAL_MODULE_ENABLED
00066 
00067 /* Private typedef -----------------------------------------------------------*/
00068 /* Private define ------------------------------------------------------------*/
00069 /**
00070  * @brief STM32L4xx HAL Driver version number V1.1.0
00071    */
00072 #define __STM32L4xx_HAL_VERSION_MAIN   (0x01) /*!< [31:24] main version */
00073 #define __STM32L4xx_HAL_VERSION_SUB1   (0x01) /*!< [23:16] sub1 version */
00074 #define __STM32L4xx_HAL_VERSION_SUB2   (0x00) /*!< [15:8]  sub2 version */
00075 #define __STM32L4xx_HAL_VERSION_RC     (0x00) /*!< [7:0]  release candidate */
00076 #define __STM32L4xx_HAL_VERSION         ((__STM32L4xx_HAL_VERSION_MAIN << 24)\
00077                                         |(__STM32L4xx_HAL_VERSION_SUB1 << 16)\
00078                                         |(__STM32L4xx_HAL_VERSION_SUB2 << 8 )\
00079                                         |(__STM32L4xx_HAL_VERSION_RC))
00080 
00081 #define VREFBUF_TIMEOUT_VALUE     (uint32_t)10   /* 10 ms (to be confirmed) */
00082 
00083 /* ------------ SYSCFG registers bit address in the alias region ------------ */
00084 #define SYSCFG_OFFSET             (SYSCFG_BASE - PERIPH_BASE)
00085 /* ---  MEMRMP Register ---*/
00086 /* Alias word address of FB_MODE bit */
00087 #define MEMRMP_OFFSET             SYSCFG_OFFSET
00088 #define FB_MODE_BitNumber         ((uint8_t)0x8)
00089 #define FB_MODE_BB                (PERIPH_BB_BASE + (MEMRMP_OFFSET * 32) + (FB_MODE_BitNumber * 4))
00090 
00091 /* --- SCSR Register ---*/
00092 /* Alias word address of SRAM2ER bit */
00093 #define SCSR_OFFSET              (SYSCFG_OFFSET + 0x18)
00094 #define BRER_BitNumber           ((uint8_t)0x0)
00095 #define SCSR_SRAM2ER_BB          (PERIPH_BB_BASE + (SCSR_OFFSET * 32) + (BRER_BitNumber * 4))
00096 
00097 /* Private macro -------------------------------------------------------------*/
00098 /* Private variables ---------------------------------------------------------*/
00099 static __IO uint32_t uwTick;
00100 
00101 /* Private function prototypes -----------------------------------------------*/
00102 /* Exported functions --------------------------------------------------------*/
00103 
00104 /** @defgroup HAL_Exported_Functions HAL Exported Functions
00105   * @{
00106   */
00107 
00108 /** @defgroup HAL_Exported_Functions_Group1 Initialization and de-initialization Functions
00109  *  @brief    Initialization and de-initialization functions
00110  *
00111 @verbatim
00112  ===============================================================================
00113               ##### Initialization and de-initialization functions #####
00114  ===============================================================================
00115     [..]  This section provides functions allowing to:
00116       (+) Initialize the Flash interface the NVIC allocation and initial time base
00117           clock configuration.
00118       (+) De-initialize common part of the HAL.
00119       (+) Configure the time base source to have 1ms time base with a dedicated
00120           Tick interrupt priority.
00121         (++) SysTick timer is used by default as source of time base, but user
00122              can eventually implement his proper time base source (a general purpose
00123              timer for example or other time source), keeping in mind that Time base
00124              duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
00125              handled in milliseconds basis.
00126         (++) Time base configuration function (HAL_InitTick ()) is called automatically
00127              at the beginning of the program after reset by HAL_Init() or at any time
00128              when clock is configured, by HAL_RCC_ClockConfig().
00129         (++) Source of time base is configured  to generate interrupts at regular
00130              time intervals. Care must be taken if HAL_Delay() is called from a
00131              peripheral ISR process, the Tick interrupt line must have higher priority
00132             (numerically lower) than the peripheral interrupt. Otherwise the caller
00133             ISR process will be blocked.
00134        (++) functions affecting time base configurations are declared as __weak
00135              to make  override possible  in case of other  implementations in user file.
00136 @endverbatim
00137   * @{
00138   */
00139 
00140 /**
00141   * @brief  Configure the Flash prefetch, the Instruction and Data caches,
00142   *         the time base source, NVIC and any required global low level hardware 
00143   *         by calling the HAL_MspInit() callback function to be optionally defined in user file 
00144   *         stm32l4xx_hal_msp.c.
00145   *
00146   * @note   HAL_Init() function is called at the beginning of program after reset and before 
00147   *         the clock configuration.
00148   *             
00149   * @note   In the default implementation the System Timer (Systick) is used as source of time base.
00150   *         The Systick configuration is based on MSI clock, as MSI is the clock
00151   *         used after a system Reset and the NVIC configuration is set to Priority group 4.
00152   *         Once done, time base tick starts incrementing: the tick variable counter is incremented 
00153   *         each 1ms in the SysTick_Handler() interrupt handler.
00154   *
00155   * @retval HAL status
00156   */
00157 HAL_StatusTypeDef HAL_Init(void)
00158 {
00159   /* Configure Flash prefetch, Instruction cache, Data cache */
00160   /* Default configuration at reset is:                      */
00161   /* - Prefetch disabled                                     */
00162   /* - Instruction cache enabled                             */
00163   /* - Data cache enabled                                    */
00164 #if (INSTRUCTION_CACHE_ENABLE == 0)
00165    __HAL_FLASH_INSTRUCTION_CACHE_DISABLE();
00166 #endif /* INSTRUCTION_CACHE_ENABLE */
00167 
00168 #if (DATA_CACHE_ENABLE == 0)
00169    __HAL_FLASH_DATA_CACHE_DISABLE();
00170 #endif /* DATA_CACHE_ENABLE */
00171 
00172 #if (PREFETCH_ENABLE != 0)
00173   __HAL_FLASH_PREFETCH_BUFFER_ENABLE();
00174 #endif /* PREFETCH_ENABLE */
00175 
00176   /* Set Interrupt Group Priority */
00177   HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
00178 
00179   /* Use SysTick as time base source and configure 1ms tick (default clock after Reset is MSI) */
00180   HAL_InitTick(TICK_INT_PRIORITY);
00181 
00182   /* Init the low level hardware */
00183   HAL_MspInit();
00184 
00185   /* Return function status */
00186   return HAL_OK;
00187 }
00188 
00189 /**
00190   * @brief De-initialize common part of the HAL and stop the source of time base.
00191   * @note This function is optional.
00192   * @retval HAL status
00193   */
00194 HAL_StatusTypeDef HAL_DeInit(void)
00195 {
00196   /* Reset of all peripherals */
00197   __HAL_RCC_APB1_FORCE_RESET();
00198   __HAL_RCC_APB1_RELEASE_RESET();
00199 
00200   __HAL_RCC_APB2_FORCE_RESET();
00201   __HAL_RCC_APB2_RELEASE_RESET();
00202 
00203   __HAL_RCC_AHB1_FORCE_RESET();
00204   __HAL_RCC_AHB1_RELEASE_RESET();
00205 
00206   __HAL_RCC_AHB2_FORCE_RESET();
00207   __HAL_RCC_AHB2_RELEASE_RESET();
00208 
00209   __HAL_RCC_AHB3_FORCE_RESET();
00210   __HAL_RCC_AHB3_RELEASE_RESET();
00211 
00212   /* De-Init the low level hardware */
00213   HAL_MspDeInit();
00214 
00215   /* Return function status */
00216   return HAL_OK;
00217 }
00218 
00219 /**
00220   * @brief  Initialize the MSP.
00221   * @retval None
00222   */
00223 __weak void HAL_MspInit(void)
00224 {
00225   /* NOTE : This function should not be modified, when the callback is needed,
00226             the HAL_MspInit could be implemented in the user file
00227    */
00228 }
00229 
00230 /**
00231   * @brief  DeInitialize the MSP.
00232   * @retval None
00233   */
00234 __weak void HAL_MspDeInit(void)
00235 {
00236   /* NOTE : This function should not be modified, when the callback is needed,
00237             the HAL_MspDeInit could be implemented in the user file
00238    */
00239 }
00240 
00241 /**
00242   * @brief This function configures the source of the time base:
00243   *        The time source is configured to have 1ms time base with a dedicated
00244   *        Tick interrupt priority.
00245   * @note This function is called  automatically at the beginning of program after
00246   *       reset by HAL_Init() or at any time when clock is reconfigured  by HAL_RCC_ClockConfig().
00247   * @note In the default implementation, SysTick timer is the source of time base.
00248   *       It is used to generate interrupts at regular time intervals.
00249   *       Care must be taken if HAL_Delay() is called from a peripheral ISR process,
00250   *       The SysTick interrupt must have higher priority (numerically lower)
00251   *       than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
00252   *       The function is declared as __weak  to be overwritten  in case of other
00253   *       implementation  in user file.
00254   * @param TickPriority: Tick interrupt priority.
00255   * @retval HAL status
00256   */
00257 __weak HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
00258 {
00259   /*Configure the SysTick to have interrupt in 1ms time basis*/
00260   HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
00261 
00262   /*Configure the SysTick IRQ priority */
00263   HAL_NVIC_SetPriority(SysTick_IRQn, TickPriority ,0);
00264 
00265   /* Return function status */
00266   return HAL_OK;
00267 }
00268 
00269 /**
00270   * @}
00271   */
00272 
00273 /** @defgroup HAL_Exported_Functions_Group2 HAL Control functions
00274  *  @brief    HAL Control functions
00275  *
00276 @verbatim
00277  ===============================================================================
00278                       ##### HAL Control functions #####
00279  ===============================================================================
00280     [..]  This section provides functions allowing to:
00281       (+) Provide a tick value in millisecond
00282       (+) Provide a blocking delay in millisecond
00283       (+) Suspend the time base source interrupt
00284       (+) Resume the time base source interrupt
00285       (+) Get the HAL API driver version
00286       (+) Get the device identifier
00287       (+) Get the device revision identifier
00288 
00289 @endverbatim
00290   * @{
00291   */
00292 
00293 /**
00294   * @brief This function is called to increment a global variable "uwTick"
00295   *        used as application time base.
00296   * @note In the default implementation, this variable is incremented each 1ms
00297   *       in SysTick ISR.
00298  * @note This function is declared as __weak to be overwritten in case of other
00299   *      implementations in user file.
00300   * @retval None
00301   */
00302 __weak void HAL_IncTick(void)
00303 {
00304   uwTick++;
00305 }
00306 
00307 /**
00308   * @brief Provide a tick value in millisecond.
00309   * @note This function is declared as __weak to be overwritten in case of other
00310   *       implementations in user file.
00311   * @retval tick value
00312   */
00313 __weak uint32_t HAL_GetTick(void)
00314 {
00315   return uwTick;
00316 }
00317 
00318 /**
00319   * @brief Provide accurate delay (in milliseconds) based on variable incremented.
00320   * @note In the default implementation , SysTick timer is the source of time base.
00321   *       It is used to generate interrupts at regular time intervals where uwTick
00322   *       is incremented.
00323   * @note This function is declared as __weak to be overwritten in case of other
00324   *       implementations in user file.
00325   * @param Delay: specifies the delay time length, in milliseconds.
00326   * @retval None
00327   */
00328 __weak void HAL_Delay(uint32_t Delay)
00329 {
00330   uint32_t tickstart = 0;
00331   tickstart = HAL_GetTick();
00332   while((HAL_GetTick() - tickstart) < Delay)
00333   {
00334   }
00335 }
00336 
00337 /**
00338   * @brief Suspend Tick increment.
00339   * @note In the default implementation , SysTick timer is the source of time base. It is
00340   *       used to generate interrupts at regular time intervals. Once HAL_SuspendTick()
00341   *       is called, the SysTick interrupt will be disabled and so Tick increment
00342   *       is suspended.
00343   * @note This function is declared as __weak to be overwritten in case of other
00344   *       implementations in user file.
00345   * @retval None
00346   */
00347 __weak void HAL_SuspendTick(void)
00348 {
00349   /* Disable SysTick Interrupt */
00350   SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk;
00351 }
00352 
00353 /**
00354   * @brief Resume Tick increment.
00355   * @note In the default implementation , SysTick timer is the source of time base. It is
00356   *       used to generate interrupts at regular time intervals. Once HAL_ResumeTick()
00357   *       is called, the SysTick interrupt will be enabled and so Tick increment
00358   *       is resumed.
00359   * @note This function is declared as __weak to be overwritten in case of other
00360   *       implementations in user file.
00361   * @retval None
00362   */
00363 __weak void HAL_ResumeTick(void)
00364 {
00365   /* Enable SysTick Interrupt */
00366   SysTick->CTRL  |= SysTick_CTRL_TICKINT_Msk;
00367 }
00368 
00369 /**
00370   * @brief  Return the HAL revision.
00371   * @retval version : 0xXYZR (8bits for each decimal, R for RC)
00372   */
00373 uint32_t HAL_GetHalVersion(void)
00374 {
00375  return __STM32L4xx_HAL_VERSION;
00376 }
00377 
00378 /**
00379   * @brief  Return the device revision identifier.
00380   * @retval Device revision identifier
00381   */
00382 uint32_t HAL_GetREVID(void)
00383 {
00384    return((DBGMCU->IDCODE & DBGMCU_IDCODE_REV_ID) >> 16);
00385 }
00386 
00387 /**
00388   * @brief  Return the device identifier.
00389   * @retval Device identifier
00390   */
00391 uint32_t HAL_GetDEVID(void)
00392 {
00393    return(DBGMCU->IDCODE & DBGMCU_IDCODE_DEV_ID);
00394 }
00395 
00396 /**
00397   * @}
00398   */
00399 
00400 /** @defgroup HAL_Exported_Functions_Group3 HAL Debug functions
00401  *  @brief    HAL Debug functions
00402  *
00403 @verbatim
00404  ===============================================================================
00405                       ##### HAL Debug functions #####
00406  ===============================================================================
00407     [..]  This section provides functions allowing to:
00408       (+) Enable/Disable Debug module during SLEEP mode
00409       (+) Enable/Disable Debug module during STOP1/STOP2 modes
00410       (+) Enable/Disable Debug module during STANDBY mode
00411 
00412 @endverbatim
00413   * @{
00414   */
00415 
00416 /**
00417   * @brief  Enable the Debug Module during SLEEP mode.
00418   * @retval None
00419   */
00420 void HAL_DBGMCU_EnableDBGSleepMode(void)
00421 {
00422   SET_BIT(DBGMCU->CR, DBGMCU_CR_DBG_SLEEP);
00423 }
00424 
00425 /**
00426   * @brief  Disable the Debug Module during SLEEP mode.
00427   * @retval None
00428   */
00429 void HAL_DBGMCU_DisableDBGSleepMode(void)
00430 {
00431   CLEAR_BIT(DBGMCU->CR, DBGMCU_CR_DBG_SLEEP);
00432 }
00433 
00434 /**
00435   * @brief  Enable the Debug Module during STOP1/STOP2 modes.
00436   * @retval None
00437   */
00438 void HAL_DBGMCU_EnableDBGStopMode(void)
00439 {
00440   SET_BIT(DBGMCU->CR, DBGMCU_CR_DBG_STOP);
00441 }
00442 
00443 /**
00444   * @brief  Disable the Debug Module during STOP1/STOP2 modes.
00445   * @retval None
00446   */
00447 void HAL_DBGMCU_DisableDBGStopMode(void)
00448 {
00449   CLEAR_BIT(DBGMCU->CR, DBGMCU_CR_DBG_STOP);
00450 }
00451 
00452 /**
00453   * @brief  Enable the Debug Module during STANDBY mode.
00454   * @retval None
00455   */
00456 void HAL_DBGMCU_EnableDBGStandbyMode(void)
00457 {
00458   SET_BIT(DBGMCU->CR, DBGMCU_CR_DBG_STANDBY);
00459 }
00460 
00461 /**
00462   * @brief  Disable the Debug Module during STANDBY mode.
00463   * @retval None
00464   */
00465 void HAL_DBGMCU_DisableDBGStandbyMode(void)
00466 {
00467   CLEAR_BIT(DBGMCU->CR, DBGMCU_CR_DBG_STANDBY);
00468 }
00469 
00470 /**
00471   * @}
00472   */
00473 
00474 /** @defgroup HAL_Exported_Functions_Group4 HAL SYSCFG configuration functions
00475  *  @brief    HAL SYSCFG configuration functions
00476  *
00477 @verbatim
00478  ===============================================================================
00479                       ##### HAL SYSCFG configuration functions #####
00480  ===============================================================================
00481     [..]  This section provides functions allowing to:
00482       (+) Start a hardware SRAM2 erase operation
00483       (+) Enable/Disable the Internal FLASH Bank Swapping
00484       (+) Configure the Voltage reference buffer
00485       (+) Enable/Disable the Voltage reference buffer
00486 
00487 @endverbatim
00488   * @{
00489   */
00490 
00491 /**
00492   * @brief  Start a hardware SRAM2 erase operation.
00493   * @note   As long as SRAM2 is not erased the SRAM2ER bit will be set.
00494   *         This bit is automatically reset at the end of the SRAM2 erase operation.
00495   * @retval None
00496   */
00497 void HAL_SYSCFG_SRAM2Erase(void)
00498 {
00499   /* unlock the write protection of the SRAM2ER bit */
00500   SYSCFG->SKR = 0xCA;
00501   SYSCFG->SKR = 0x53;
00502   /* Starts a hardware SRAM2 erase operation*/
00503   *(__IO uint32_t *) SCSR_SRAM2ER_BB = (uint8_t)0x00000001;
00504 }
00505 
00506 /**
00507   * @brief  Enable the Internal FLASH Bank Swapping.
00508   *
00509   * @note   This function can be used only for STM32L4xx devices.
00510   *
00511   * @note   Flash Bank2 mapped at 0x08000000 (and aliased @0x00000000)
00512   *         and Flash Bank1 mapped at 0x08100000 (and aliased at 0x00100000)
00513   *
00514   * @retval None
00515   */
00516 void HAL_SYSCFG_EnableMemorySwappingBank(void)
00517 {
00518   *(__IO uint32_t *)FB_MODE_BB = (uint32_t)ENABLE;
00519 }
00520 
00521 /**
00522   * @brief  Disable the Internal FLASH Bank Swapping.
00523   *
00524   * @note   This function can be used only for STM32L4xx devices.
00525   *
00526   * @note   The default state : Flash Bank1 mapped at 0x08000000 (and aliased @0x0000 0000)
00527   *         and Flash Bank2 mapped at 0x08100000 (and aliased at 0x00100000)
00528   *
00529   * @retval None
00530   */
00531 void HAL_SYSCFG_DisableMemorySwappingBank(void)
00532 {
00533 
00534   *(__IO uint32_t *)FB_MODE_BB = (uint32_t)DISABLE;
00535 }
00536 
00537 /**
00538   * @brief Configure the internal voltage reference buffer voltage scale.
00539   * @param  VoltageScaling: specifies the output voltage to achieve
00540   *          This parameter can be one of the following values:
00541   *            @arg SYSCFG_VREFBUF_VOLTAGE_SCALE0: VREF_OUT1 around 2.048 V. 
00542   *                                                This requires VDDA equal to or higher than 2.4 V.
00543   *            @arg SYSCFG_VREFBUF_VOLTAGE_SCALE1: VREF_OUT1 around 2.5 V. 
00544   *                                                This requires VDDA equal to or higher than 2.8 V.
00545   * @retval None
00546   */
00547 void HAL_SYSCFG_VREFBUF_VoltageScalingConfig(uint32_t VoltageScaling)
00548 {
00549   /* Check the parameters */
00550   assert_param(IS_SYSCFG_VREFBUF_VOLTAGE_SCALE(VoltageScaling));
00551   
00552   MODIFY_REG(VREFBUF->CSR, VREFBUF_CSR_VRS, VoltageScaling);
00553 }
00554 
00555 /**
00556   * @brief Configure the internal voltage reference buffer high impedance mode.
00557   * @param  Mode: specifies the high impedance mode
00558   *          This parameter can be one of the following values:
00559   *            @arg SYSCFG_VREFBUF_HIGH_IMPEDANCE_DISABLE: VREF+ pin is internally connect to VREFINT output.
00560   *            @arg SYSCFG_VREFBUF_HIGH_IMPEDANCE_ENABLE: VREF+ pin is high impedance.
00561   * @retval None
00562   */
00563 void HAL_SYSCFG_VREFBUF_HighImpedanceConfig(uint32_t Mode)
00564 {
00565   /* Check the parameters */
00566   assert_param(IS_SYSCFG_VREFBUF_HIGH_IMPEDANCE(Mode));
00567   
00568   MODIFY_REG(VREFBUF->CSR, VREFBUF_CSR_HIZ, Mode);
00569 }
00570 
00571 /**
00572   * @brief  Tune the Internal Voltage Reference buffer (VREFBUF).
00573   * @retval None
00574   */
00575 void HAL_SYSCFG_VREFBUF_TrimmingConfig(uint32_t TrimmingValue)
00576 {
00577   /* Check the parameters */
00578   assert_param(IS_SYSCFG_VREFBUF_TRIMMING(TrimmingValue));
00579   
00580   MODIFY_REG(VREFBUF->CCR, VREFBUF_CCR_TRIM, TrimmingValue);
00581 }
00582 
00583 /**
00584   * @brief  Enable the Internal Voltage Reference buffer (VREFBUF).
00585   * @retval HAL_OK/HAL_TIMEOUT
00586   */
00587 HAL_StatusTypeDef HAL_SYSCFG_EnableVREFBUF(void)
00588 {
00589   uint32_t  tickstart = 0;
00590   
00591   SET_BIT(VREFBUF->CSR, VREFBUF_CSR_ENVR);
00592   
00593   /* Get Start Tick*/
00594   tickstart = HAL_GetTick();
00595 
00596   /* Wait for VRR bit  */
00597   while(READ_BIT(VREFBUF->CSR, VREFBUF_CSR_VRR) == RESET)
00598   {
00599     if((HAL_GetTick() - tickstart) > VREFBUF_TIMEOUT_VALUE)
00600     {
00601       return HAL_TIMEOUT;
00602     }
00603   }
00604   
00605   return HAL_OK;
00606 }
00607 
00608 /**
00609   * @brief  Disable the Internal Voltage Reference buffer (VREFBUF).
00610   *
00611   * @retval None
00612   */
00613 void HAL_SYSCFG_DisableVREFBUF(void)
00614 {
00615   CLEAR_BIT(VREFBUF->CSR, VREFBUF_CSR_ENVR);
00616 }
00617 
00618 /**
00619   * @}
00620   */
00621 
00622 /**
00623   * @}
00624   */
00625 
00626 #endif /* HAL_MODULE_ENABLED */
00627 /**
00628   * @}
00629   */
00630 
00631 /**
00632   * @}
00633   */
00634 
00635 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
00636