Diff: targets/cmsis/TARGET_STM/TARGET_STM32L4/stm32l4xx_hal_lcd.c

Revision:

610:813dcc80987e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32L4/stm32l4xx_hal_lcd.c	Fri Aug 14 13:15:17 2015 +0100
@@ -0,0 +1,620 @@
+/**
+  ******************************************************************************
+  * @file    stm32l4xx_hal_lcd.c
+  * @author  MCD Application Team
+  * @version V1.0.0
+  * @date    26-June-2015
+  * @brief   LCD Controller HAL module driver.
+  *          This file provides firmware functions to manage the following
+  *          functionalities of the LCD Controller (LCD) peripheral:
+  *           + Initialization/de-initialization methods
+  *           + I/O operation methods
+  *           + Peripheral State methods
+  *
+  @verbatim
+  ==============================================================================
+                        ##### How to use this driver #####
+  ==============================================================================
+      [..] The LCD HAL driver can be used as follows:
+
+      (#) Declare a LCD_HandleTypeDef handle structure.
+      
+      -@- The frequency generator allows you to achieve various LCD frame rates
+          starting from an LCD input clock frequency (LCDCLK) which can vary
+          from 32 kHz up to 1 MHz.      
+      
+      (#) Initialize the LCD low level resources by implementing the HAL_LCD_MspInit() API:
+                  
+          (++) Enable the LCDCLK (same as RTCCLK): to configure the RTCCLK/LCDCLK, proceed as follows:
+               (+++) Use RCC function HAL_RCCEx_PeriphCLKConfig in indicating RCC_PERIPHCLK_LCD and
+                  selected clock source (HSE, LSI or LSE)
+
+          (++) LCD pins configuration:
+              (+++) Enable the clock for the LCD GPIOs.
+              (+++) Configure these LCD pins as alternate function no-pull.
+          (++) Enable the LCD interface clock.
+
+      
+      (#) Program the Prescaler, Divider, Blink mode, Blink Frequency Duty, Bias,
+          Voltage Source, Dead Time, Pulse On Duration, Contrast, High drive and Multiplexer
+          Segment in the Init structure of the LCD handle.
+
+      (#) Initialize the LCD registers by calling the HAL_LCD_Init() API.
+
+      -@- The HAL_LCD_Init() API configures also the low level Hardware GPIO, CLOCK, ...etc)
+          by calling the customized HAL_LCD_MspInit() API.
+      -@- After calling the HAL_LCD_Init() the LCD RAM memory is cleared
+
+      (#) Optionally you can update the LCD configuration using these macros:
+              (++) LCD High Drive using the __HAL_LCD_HIGHDRIVER_ENABLE() and __HAL_LCD_HIGHDRIVER_DISABLE() macros
+              (++) Voltage output buffer using __HAL_LCD_VOLTAGE_BUFFER_ENABLE() and __HAL_LCD_VOLTAGE_BUFFER_DISABLE() macros
+              (++) LCD Pulse ON Duration using the __HAL_LCD_PULSEONDURATION_CONFIG() macro
+              (++) LCD Dead Time using the __HAL_LCD_DEADTIME_CONFIG() macro
+              (++) The LCD Blink mode and frequency using the __HAL_LCD_BLINK_CONFIG() macro
+              (++) The LCD Contrast using the __HAL_LCD_CONTRAST_CONFIG() macro
+
+      (#) Write to the LCD RAM memory using the HAL_LCD_Write() API, this API can be called
+          more time to update the different LCD RAM registers before calling
+          HAL_LCD_UpdateDisplayRequest() API.
+
+      (#) The HAL_LCD_Clear() API can be used to clear the LCD RAM memory.
+
+      (#) When LCD RAM memory is updated enable the update display request using
+          the HAL_LCD_UpdateDisplayRequest() API.
+
+      [..] LCD and low power modes:
+           (#) The LCD remain active during Sleep, Low Power run, Low Power Sleep and
+               STOP modes.
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2015 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 "stm32l4xx_hal.h"
+
+#if defined(STM32L476xx) || defined(STM32L486xx)
+
+/** @addtogroup STM32L4xx_HAL_Driver
+  * @{
+  */
+
+#ifdef HAL_LCD_MODULE_ENABLED
+
+/** @defgroup LCD LCD
+  * @brief LCD HAL module driver
+  * @{
+  */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/** @defgroup LCD_Private_Defines LCD Private Defines
+  * @{
+  */
+
+#define LCD_TIMEOUT_VALUE             1000
+
+/**
+  * @}
+  */
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Exported functions --------------------------------------------------------*/
+
+/** @defgroup LCD_Exported_Functions LCD Exported Functions
+  * @{
+  */
+
+/** @defgroup LCD_Exported_Functions_Group1 Initialization/de-initialization methods
+  *  @brief    Initialization and Configuration functions
+  *
+@verbatim
+===============================================================================
+            ##### Initialization and Configuration functions #####
+ ===============================================================================
+    [..]
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Initialize the LCD peripheral according to the specified parameters
+  *         in the LCD_InitStruct and initialize the associated handle.
+  * @note   This function can be used only when the LCD is disabled.
+  * @param  hlcd: LCD handle
+  * @retval None
+  */
+HAL_StatusTypeDef HAL_LCD_Init(LCD_HandleTypeDef *hlcd)
+{
+  uint32_t tickstart = 0x00;
+  uint32_t counter = 0;
+
+  /* Check the LCD handle allocation */
+  if(hlcd == NULL)
+  {
+    return HAL_ERROR;
+  }
+
+  /* Check function parameters */
+  assert_param(IS_LCD_ALL_INSTANCE(hlcd->Instance));
+  assert_param(IS_LCD_PRESCALER(hlcd->Init.Prescaler));
+  assert_param(IS_LCD_DIVIDER(hlcd->Init.Divider));
+  assert_param(IS_LCD_DUTY(hlcd->Init.Duty));
+  assert_param(IS_LCD_BIAS(hlcd->Init.Bias));
+  assert_param(IS_LCD_VOLTAGE_SOURCE(hlcd->Init.VoltageSource));
+  assert_param(IS_LCD_PULSE_ON_DURATION(hlcd->Init.PulseOnDuration));
+  assert_param(IS_LCD_HIGH_DRIVE(hlcd->Init.HighDrive));
+  assert_param(IS_LCD_DEAD_TIME(hlcd->Init.DeadTime));
+  assert_param(IS_LCD_CONTRAST(hlcd->Init.Contrast));
+  assert_param(IS_LCD_BLINK_FREQUENCY(hlcd->Init.BlinkFrequency));
+  assert_param(IS_LCD_BLINK_MODE(hlcd->Init.BlinkMode));
+  assert_param(IS_LCD_MUX_SEGMENT(hlcd->Init.MuxSegment));
+
+  if(hlcd->State == HAL_LCD_STATE_RESET)
+  {
+    /* Allocate lock resource and initialize it */
+    hlcd->Lock = HAL_UNLOCKED;
+
+    /* Initialize the low level hardware (MSP) */
+    HAL_LCD_MspInit(hlcd);
+  }
+
+  hlcd->State = HAL_LCD_STATE_BUSY;
+
+  /* Disable the peripheral */
+  __HAL_LCD_DISABLE(hlcd);
+
+  /* Clear the LCD_RAM registers and enable the display request by setting the UDR bit
+     in the LCD_SR register */
+  for(counter = LCD_RAM_REGISTER0; counter <= LCD_RAM_REGISTER15; counter++)
+  {
+    hlcd->Instance->RAM[counter] = 0;
+  }
+  /* Enable the display request */
+  hlcd->Instance->SR |= LCD_SR_UDR;
+
+  /* Configure the LCD Prescaler, Divider, Blink mode and Blink Frequency:
+     Set PS[3:0] bits according to hlcd->Init.Prescaler value
+     Set DIV[3:0] bits according to hlcd->Init.Divider value
+     Set BLINK[1:0] bits according to hlcd->Init.BlinkMode value
+     Set BLINKF[2:0] bits according to hlcd->Init.BlinkFrequency value
+     Set DEAD[2:0] bits according to hlcd->Init.DeadTime value
+     Set PON[2:0] bits according to hlcd->Init.PulseOnDuration value
+     Set CC[2:0] bits according to hlcd->Init.Contrast value
+     Set HD bit according to hlcd->Init.HighDrive value */
+   MODIFY_REG(hlcd->Instance->FCR, \
+      (LCD_FCR_PS | LCD_FCR_DIV | LCD_FCR_BLINK| LCD_FCR_BLINKF | \
+       LCD_FCR_DEAD | LCD_FCR_PON | LCD_FCR_CC | LCD_FCR_HD), \
+      (hlcd->Init.Prescaler | hlcd->Init.Divider | hlcd->Init.BlinkMode | hlcd->Init.BlinkFrequency | \
+       hlcd->Init.DeadTime | hlcd->Init.PulseOnDuration | hlcd->Init.Contrast | hlcd->Init.HighDrive));
+
+  /* Wait until LCD Frame Control Register Synchronization flag (FCRSF) is set in the LCD_SR register
+     This bit is set by hardware each time the LCD_FCR register is updated in the LCDCLK
+     domain. It is cleared by hardware when writing to the LCD_FCR register.*/
+  LCD_WaitForSynchro(hlcd);
+
+  /* Configure the LCD Duty, Bias, Voltage Source, Dead Time, Pulse On Duration and Contrast:
+     Set DUTY[2:0] bits according to hlcd->Init.Duty value
+     Set BIAS[1:0] bits according to hlcd->Init.Bias value
+     Set VSEL bit according to hlcd->Init.VoltageSource value
+     Set MUX_SEG bit according to hlcd->Init.MuxSegment value */
+  MODIFY_REG(hlcd->Instance->CR, \
+    (LCD_CR_DUTY | LCD_CR_BIAS | LCD_CR_VSEL | LCD_CR_MUX_SEG), \
+    (hlcd->Init.Duty | hlcd->Init.Bias | hlcd->Init.VoltageSource | hlcd->Init.MuxSegment));
+
+  /* Enable the peripheral */
+  __HAL_LCD_ENABLE(hlcd);
+
+  /* Get timeout */
+  tickstart = HAL_GetTick();
+
+  /* Wait Until the LCD is enabled */
+  while(__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_ENS) == RESET)
+  {
+    if((HAL_GetTick() - tickstart ) > LCD_TIMEOUT_VALUE)
+    {
+      hlcd->ErrorCode = HAL_LCD_ERROR_ENS;
+      return HAL_TIMEOUT;
+    }
+  }
+
+  /* Get timeout */
+  tickstart = HAL_GetTick();
+
+  /*!< Wait Until the LCD Booster is ready */
+  while(__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_RDY) == RESET)
+  {
+    if((HAL_GetTick() - tickstart ) > LCD_TIMEOUT_VALUE)
+    {
+      hlcd->ErrorCode = HAL_LCD_ERROR_RDY;
+      return HAL_TIMEOUT;
+    }
+  }
+
+  /* Initialize the LCD state */
+  hlcd->ErrorCode = HAL_LCD_ERROR_NONE;
+  hlcd->State= HAL_LCD_STATE_READY;
+
+  return HAL_OK;
+}
+
+/**
+  * @brief  DeInitialize the LCD peripheral.
+  * @param  hlcd: LCD handle
+  * @retval HAL status
+  */
+HAL_StatusTypeDef HAL_LCD_DeInit(LCD_HandleTypeDef *hlcd)
+{
+  /* Check the LCD handle allocation */
+  if(hlcd == NULL)
+  {
+    return HAL_ERROR;
+  }
+
+  /* Check the parameters */
+  assert_param(IS_LCD_ALL_INSTANCE(hlcd->Instance));
+
+  hlcd->State = HAL_LCD_STATE_BUSY;
+
+  /* DeInit the low level hardware */
+  HAL_LCD_MspDeInit(hlcd);
+
+  hlcd->ErrorCode = HAL_LCD_ERROR_NONE;
+  hlcd->State = HAL_LCD_STATE_RESET;
+
+  /* Release Lock */
+  __HAL_UNLOCK(hlcd);
+
+  return HAL_OK;
+}
+
+/**
+  * @brief  DeInitialize the LCD MSP.
+  * @param  hlcd: LCD handle
+  * @retval None
+  */
+ __weak void HAL_LCD_MspDeInit(LCD_HandleTypeDef *hlcd)
+{
+  /* NOTE: This function should not be modified, when the callback is needed,
+           the HAL_LCD_MspDeInit it to be implemented in the user file
+   */
+}
+
+/**
+  * @brief  Initialize the LCD MSP.
+  * @param  hlcd: LCD handle
+  * @retval None
+  */
+ __weak void HAL_LCD_MspInit(LCD_HandleTypeDef *hlcd)
+{
+  /* NOTE: This function should not be modified, when the callback is needed,
+           the HAL_LCD_MspInit is to be implemented in the user file
+   */
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup LCD_Exported_Functions_Group2 IO operation methods
+  *  @brief LCD RAM functions
+  *
+@verbatim
+ ===============================================================================
+                      ##### IO operation functions #####
+ ===============================================================================
+ [..] Using its double buffer memory the LCD controller ensures the coherency of the
+ displayed information without having to use interrupts to control LCD_RAM
+ modification.
+ The application software can access the first buffer level (LCD_RAM) through
+ the APB interface. Once it has modified the LCD_RAM using the HAL_LCD_Write() API,
+ it sets the UDR flag in the LCD_SR register using the HAL_LCD_UpdateDisplayRequest() API.
+ This UDR flag (update display request) requests the updated information to be
+ moved into the second buffer level (LCD_DISPLAY).
+ This operation is done synchronously with the frame (at the beginning of the
+ next frame), until the update is completed, the LCD_RAM is write protected and
+ the UDR flag stays high.
+ Once the update is completed another flag (UDD - Update Display Done) is set and
+ generates an interrupt if the UDDIE bit in the LCD_FCR register is set.
+ The time it takes to update LCD_DISPLAY is, in the worst case, one odd and one
+ even frame.
+ The update will not occur (UDR = 1 and UDD = 0) until the display is
+ enabled (LCDEN = 1).
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Write a word in the specific LCD RAM.
+  * @param  hlcd: LCD handle
+  * @param  RAMRegisterIndex: specifies the LCD RAM Register.
+  *   This parameter can be one of the following values:
+  *     @arg LCD_RAM_REGISTER0: LCD RAM Register 0
+  *     @arg LCD_RAM_REGISTER1: LCD RAM Register 1
+  *     @arg LCD_RAM_REGISTER2: LCD RAM Register 2
+  *     @arg LCD_RAM_REGISTER3: LCD RAM Register 3
+  *     @arg LCD_RAM_REGISTER4: LCD RAM Register 4
+  *     @arg LCD_RAM_REGISTER5: LCD RAM Register 5
+  *     @arg LCD_RAM_REGISTER6: LCD RAM Register 6
+  *     @arg LCD_RAM_REGISTER7: LCD RAM Register 7
+  *     @arg LCD_RAM_REGISTER8: LCD RAM Register 8
+  *     @arg LCD_RAM_REGISTER9: LCD RAM Register 9
+  *     @arg LCD_RAM_REGISTER10: LCD RAM Register 10
+  *     @arg LCD_RAM_REGISTER11: LCD RAM Register 11
+  *     @arg LCD_RAM_REGISTER12: LCD RAM Register 12
+  *     @arg LCD_RAM_REGISTER13: LCD RAM Register 13
+  *     @arg LCD_RAM_REGISTER14: LCD RAM Register 14
+  *     @arg LCD_RAM_REGISTER15: LCD RAM Register 15
+  * @param  RAMRegisterMask: specifies the LCD RAM Register Data Mask.
+  * @param  Data: specifies LCD Data Value to be written.
+  * @retval None
+  */
+HAL_StatusTypeDef HAL_LCD_Write(LCD_HandleTypeDef *hlcd, uint32_t RAMRegisterIndex, uint32_t RAMRegisterMask, uint32_t Data)
+{
+  uint32_t tickstart = 0x00;
+
+  if((hlcd->State == HAL_LCD_STATE_READY) || (hlcd->State == HAL_LCD_STATE_BUSY))
+  {
+    /* Check the parameters */
+    assert_param(IS_LCD_RAM_REGISTER(RAMRegisterIndex));
+
+    if(hlcd->State == HAL_LCD_STATE_READY)
+    {
+      /* Process Locked */
+      __HAL_LOCK(hlcd);
+      hlcd->State = HAL_LCD_STATE_BUSY;
+
+      /* Get timeout */
+      tickstart = HAL_GetTick();
+
+      /*!< Wait Until the LCD is ready */
+      while(__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_UDR) != RESET)
+      {
+        if((HAL_GetTick() - tickstart ) > LCD_TIMEOUT_VALUE)
+        {
+          hlcd->ErrorCode = HAL_LCD_ERROR_UDR;
+
+          /* Process Unlocked */
+          __HAL_UNLOCK(hlcd);
+
+          return HAL_TIMEOUT;
+        }
+      }
+    }
+
+    /* Copy the new Data bytes to LCD RAM register */
+    MODIFY_REG(hlcd->Instance->RAM[RAMRegisterIndex], ~(RAMRegisterMask), Data);
+
+    return HAL_OK;
+  }
+  else
+  {
+    return HAL_ERROR;
+  }
+}
+
+/**
+  * @brief Clear the LCD RAM registers.
+  * @param hlcd: LCD handle
+  * @retval None
+  */
+HAL_StatusTypeDef HAL_LCD_Clear(LCD_HandleTypeDef *hlcd)
+{
+  uint32_t tickstart = 0x00;
+  uint32_t counter = 0;
+
+  if((hlcd->State == HAL_LCD_STATE_READY) || (hlcd->State == HAL_LCD_STATE_BUSY))
+  {
+    /* Process Locked */
+    __HAL_LOCK(hlcd);
+
+    hlcd->State = HAL_LCD_STATE_BUSY;
+
+    /* Get timeout */
+    tickstart = HAL_GetTick();
+
+    /*!< Wait Until the LCD is ready */
+    while(__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_UDR) != RESET)
+    {
+      if((HAL_GetTick() - tickstart ) > LCD_TIMEOUT_VALUE)
+      {
+        hlcd->ErrorCode = HAL_LCD_ERROR_UDR;
+
+        /* Process Unlocked */
+        __HAL_UNLOCK(hlcd);
+
+        return HAL_TIMEOUT;
+      }
+    }
+    /* Clear the LCD_RAM registers */
+    for(counter = LCD_RAM_REGISTER0; counter <= LCD_RAM_REGISTER15; counter++)
+    {
+      hlcd->Instance->RAM[counter] = 0;
+    }
+
+    /* Update the LCD display */
+    HAL_LCD_UpdateDisplayRequest(hlcd);
+
+    return HAL_OK;
+  }
+  else
+  {
+    return HAL_ERROR;
+  }
+}
+
+/**
+  * @brief  Enable the Update Display Request.
+  * @param  hlcd: LCD handle
+  * @note   Each time software modifies the LCD_RAM it must set the UDR bit to
+  *         transfer the updated data to the second level buffer.
+  *         The UDR bit stays set until the end of the update and during this
+  *         time the LCD_RAM is write protected.
+  * @note   When the display is disabled, the update is performed for all
+  *         LCD_DISPLAY locations.
+  *         When the display is enabled, the update is performed only for locations
+  *         for which commons are active (depending on DUTY). For example if
+  *         DUTY = 1/2, only the LCD_DISPLAY of COM0 and COM1 will be updated.
+  * @retval None
+  */
+HAL_StatusTypeDef HAL_LCD_UpdateDisplayRequest(LCD_HandleTypeDef *hlcd)
+{
+  uint32_t tickstart = 0x00;
+
+  /* Clear the Update Display Done flag before starting the update display request */
+  __HAL_LCD_CLEAR_FLAG(hlcd, LCD_FLAG_UDD);
+
+  /* Enable the display request */
+  hlcd->Instance->SR |= LCD_SR_UDR;
+
+  /* Get timeout */
+  tickstart = HAL_GetTick();
+
+  /*!< Wait Until the LCD display is done */
+  while(__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_UDD) == RESET)
+  {
+    if((HAL_GetTick() - tickstart ) > LCD_TIMEOUT_VALUE)
+    {
+      hlcd->ErrorCode = HAL_LCD_ERROR_UDD;
+
+      /* Process Unlocked */
+      __HAL_UNLOCK(hlcd);
+
+      return HAL_TIMEOUT;
+    }
+  }
+
+  hlcd->State = HAL_LCD_STATE_READY;
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hlcd);
+
+  return HAL_OK;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup LCD_Exported_Functions_Group3 Peripheral State methods
+  *  @brief   LCD State functions
+  *
+@verbatim
+ ===============================================================================
+                      ##### Peripheral State functions #####
+ ===============================================================================
+    [..]
+     This subsection provides a set of functions allowing to control the LCD:
+      (+) HAL_LCD_GetState() API can be helpful to check in run-time the state of the LCD peripheral State.
+      (+) HAL_LCD_GetError() API to return the LCD error code.
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief Return the LCD handle state.
+  * @param hlcd: LCD handle
+  * @retval HAL state
+  */
+HAL_LCD_StateTypeDef HAL_LCD_GetState(LCD_HandleTypeDef *hlcd)
+{
+  /* Return LCD handle state */
+  return hlcd->State;
+}
+
+/**
+  * @brief Return the LCD error code.
+  * @param hlcd: LCD handle
+  * @retval LCD Error Code
+  */
+uint32_t HAL_LCD_GetError(LCD_HandleTypeDef *hlcd)
+{
+  return hlcd->ErrorCode;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup LCD_Private_Functions LCD Private Functions
+  * @{
+  */
+
+/**
+  * @brief  Wait until the LCD FCR register is synchronized in the LCDCLK domain.
+  *   This function must be called after any write operation to LCD_FCR register.
+  * @retval None
+  */
+HAL_StatusTypeDef LCD_WaitForSynchro(LCD_HandleTypeDef *hlcd)
+{
+  uint32_t tickstart = 0x00;
+
+  /* Get timeout */
+  tickstart = HAL_GetTick();
+
+  /* Loop until FCRSF flag is set */
+  while(__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_FCRSF) == RESET)
+  {
+    if((HAL_GetTick() - tickstart ) > LCD_TIMEOUT_VALUE)
+    {
+      hlcd->ErrorCode = HAL_LCD_ERROR_FCRSF;
+      return HAL_TIMEOUT;
+    }
+  }
+
+  return HAL_OK;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* STM32L476xx || STM32L486xx */
+
+#endif /* HAL_LCD_MODULE_ENABLED */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+