/**
  ******************************************************************************
  * @file    stm32f4xx_ltdc.c
  * @author  MCD Application Team
  * @version V1.6.0
  * @date    10-July-2015
  * @brief   This file provides firmware functions to manage the following 
  *          functionalities of the LTDC controller (LTDC) peripheral:
  *           + Initialization and configuration
  *           + Interrupts and flags management
  *           
  *  @verbatim
  
 ===============================================================================
                      ##### How to use this driver #####
 ===============================================================================
    [..]
        (#) Enable LTDC clock using 
            RCC_APB2PeriphResetCmd(RCC_APB2Periph_LTDC, ENABLE) function.
        (#) Configures LTDC
          (++) Configure the required Pixel clock following the panel datasheet
          (++) Configure the Synchronous timings: VSYNC, HSYNC, Vertical and 
              Horizontal back proch, active data area and the front proch 
              timings 
          (++) Configure the synchronous signals and clock polarity in the 
              LTDC_GCR register
        (#) Configures Layer1/2 parameters
          (++) The Layer window horizontal and vertical position in the LTDC_LxWHPCR and 
               LTDC_WVPCR registers. The layer window must be in the active data area.
          (++) The pixel input format in the LTDC_LxPFCR register
          (++) The color frame buffer start address in the LTDC_LxCFBAR register
          (++) The line length and pitch of the color frame buffer in the 
               LTDC_LxCFBLR register
          (++) The number of lines of the color frame buffer in 
               the LTDC_LxCFBLNR register
          (++) if needed, load the CLUT with the RGB values and the address 
               in the LTDC_LxCLUTWR register
          (++) If needed, configure the default color and the blending factors 
               respectively in the LTDC_LxDCCR and LTDC_LxBFCR registers 

          (++) If needed, Dithering and color keying can be enabled respectively 
               in the LTDC_GCR and LTDC_LxCKCR registers. It can be also enabled 
               on the fly.    
        (#) Enable Layer1/2 and if needed the CLUT in the LTDC_LxCR register 
  
        (#) Reload the shadow registers to active register through 
            the LTDC_SRCR register.
          -@- All layer parameters can be modified on the fly except the CLUT. 
              The new configuration has to be either reloaded immediately 
              or during vertical blanking period by configuring the LTDC_SRCR register.
        (#) Call the LTDC_Cmd() to enable the LTDC controller.

    @endverbatim
  
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2015 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_ltdc.h"
#include "stm32f4xx_rcc.h"

/** @addtogroup STM32F4xx_StdPeriph_Driver
  * @{
  */

/** @defgroup LTDC 
  * @brief LTDC driver modules
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

#define GCR_MASK                     ((uint32_t)0x0FFE888F)  /* LTDC GCR Mask */


/** @defgroup LTDC_Private_Functions
  * @{
  */

/** @defgroup LTDC_Group1 Initialization and Configuration functions
 *  @brief   Initialization and Configuration functions 
 *
@verbatim
 ===============================================================================
            ##### Initialization and Configuration functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Initialize and configure the LTDC
      (+) Enable or Disable Dither
      (+) Define the position of the line interrupt
      (+) reload layers registers with new parameters
      (+) Initialize and configure layer1 and layer2
      (+) Set and configure the color keying functionality
      (+) Configure and Enables or disables CLUT 
      
@endverbatim
  * @{
  */

/**
  * @brief  Deinitializes the LTDC peripheral registers to their default reset
  *         values.
  * @param  None
  * @retval None
  */

void LTDC_DeInit(void)
{
  /* Enable LTDC reset state */
  RCC_APB2PeriphResetCmd(RCC_APB2Periph_LTDC, ENABLE);
  /* Release LTDC from reset state */
  RCC_APB2PeriphResetCmd(RCC_APB2Periph_LTDC, DISABLE);
}

/**
  * @brief  Initializes the LTDC peripheral according to the specified parameters
  *         in the LTDC_InitStruct.
  * @note   This function can be used only when the LTDC is disabled.
  * @param  LTDC_InitStruct: pointer to a LTDC_InitTypeDef structure that contains
  *         the configuration information for the specified LTDC peripheral.
  * @retval None
  */

void LTDC_Init(LTDC_InitTypeDef* LTDC_InitStruct)
{
  uint32_t horizontalsync = 0;
  uint32_t accumulatedHBP = 0;
  uint32_t accumulatedactiveW = 0;
  uint32_t totalwidth = 0;
  uint32_t backgreen = 0;
  uint32_t backred = 0;

  /* Check function parameters */
  assert_param(IS_LTDC_HSYNC(LTDC_InitStruct->LTDC_HorizontalSync));
  assert_param(IS_LTDC_VSYNC(LTDC_InitStruct->LTDC_VerticalSync));
  assert_param(IS_LTDC_AHBP(LTDC_InitStruct->LTDC_AccumulatedHBP));
  assert_param(IS_LTDC_AVBP(LTDC_InitStruct->LTDC_AccumulatedVBP));
  assert_param(IS_LTDC_AAH(LTDC_InitStruct->LTDC_AccumulatedActiveH));
  assert_param(IS_LTDC_AAW(LTDC_InitStruct->LTDC_AccumulatedActiveW));
  assert_param(IS_LTDC_TOTALH(LTDC_InitStruct->LTDC_TotalHeigh));
  assert_param(IS_LTDC_TOTALW(LTDC_InitStruct->LTDC_TotalWidth));
  assert_param(IS_LTDC_HSPOL(LTDC_InitStruct->LTDC_HSPolarity));
  assert_param(IS_LTDC_VSPOL(LTDC_InitStruct->LTDC_VSPolarity));
  assert_param(IS_LTDC_DEPOL(LTDC_InitStruct->LTDC_DEPolarity));
  assert_param(IS_LTDC_PCPOL(LTDC_InitStruct->LTDC_PCPolarity));
  assert_param(IS_LTDC_BackBlueValue(LTDC_InitStruct->LTDC_BackgroundBlueValue));
  assert_param(IS_LTDC_BackGreenValue(LTDC_InitStruct->LTDC_BackgroundGreenValue));
  assert_param(IS_LTDC_BackRedValue(LTDC_InitStruct->LTDC_BackgroundRedValue));

  /* Sets Synchronization size */
  LTDC->SSCR &= ~(LTDC_SSCR_VSH | LTDC_SSCR_HSW);
  horizontalsync = (LTDC_InitStruct->LTDC_HorizontalSync << 16);
  LTDC->SSCR |= (horizontalsync | LTDC_InitStruct->LTDC_VerticalSync);

  /* Sets Accumulated Back porch */
  LTDC->BPCR &= ~(LTDC_BPCR_AVBP | LTDC_BPCR_AHBP);
  accumulatedHBP = (LTDC_InitStruct->LTDC_AccumulatedHBP << 16);
  LTDC->BPCR |= (accumulatedHBP | LTDC_InitStruct->LTDC_AccumulatedVBP);

  /* Sets Accumulated Active Width */
  LTDC->AWCR &= ~(LTDC_AWCR_AAH | LTDC_AWCR_AAW);
  accumulatedactiveW = (LTDC_InitStruct->LTDC_AccumulatedActiveW << 16);
  LTDC->AWCR |= (accumulatedactiveW | LTDC_InitStruct->LTDC_AccumulatedActiveH);

  /* Sets Total Width */
  LTDC->TWCR &= ~(LTDC_TWCR_TOTALH | LTDC_TWCR_TOTALW);
  totalwidth = (LTDC_InitStruct->LTDC_TotalWidth << 16);
  LTDC->TWCR |= (totalwidth | LTDC_InitStruct->LTDC_TotalHeigh);

  LTDC->GCR &= (uint32_t)GCR_MASK;
  LTDC->GCR |=  (uint32_t)(LTDC_InitStruct->LTDC_HSPolarity | LTDC_InitStruct->LTDC_VSPolarity | \
                           LTDC_InitStruct->LTDC_DEPolarity | LTDC_InitStruct->LTDC_PCPolarity);

  /* sets the background color value */
  backgreen = (LTDC_InitStruct->LTDC_BackgroundGreenValue << 8);
  backred = (LTDC_InitStruct->LTDC_BackgroundRedValue << 16);

  LTDC->BCCR &= ~(LTDC_BCCR_BCBLUE | LTDC_BCCR_BCGREEN | LTDC_BCCR_BCRED);
  LTDC->BCCR |= (backred | backgreen | LTDC_InitStruct->LTDC_BackgroundBlueValue);
}

/**
  * @brief  Fills each LTDC_InitStruct member with its default value.
  * @param  LTDC_InitStruct: pointer to a LTDC_InitTypeDef structure which will
  *         be initialized.
  * @retval None
  */

void LTDC_StructInit(LTDC_InitTypeDef* LTDC_InitStruct)
{
  /*--------------- Reset LTDC init structure parameters values ----------------*/
  LTDC_InitStruct->LTDC_HSPolarity = LTDC_HSPolarity_AL;      /*!< Initialize the LTDC_HSPolarity member */ 
  LTDC_InitStruct->LTDC_VSPolarity = LTDC_VSPolarity_AL;      /*!< Initialize the LTDC_VSPolarity member */
  LTDC_InitStruct->LTDC_DEPolarity = LTDC_DEPolarity_AL;      /*!< Initialize the LTDC_DEPolarity member */
  LTDC_InitStruct->LTDC_PCPolarity = LTDC_PCPolarity_IPC;     /*!< Initialize the LTDC_PCPolarity member */
  LTDC_InitStruct->LTDC_HorizontalSync = 0x00;                /*!< Initialize the LTDC_HorizontalSync member */
  LTDC_InitStruct->LTDC_VerticalSync = 0x00;                  /*!< Initialize the LTDC_VerticalSync member */
  LTDC_InitStruct->LTDC_AccumulatedHBP = 0x00;                /*!< Initialize the LTDC_AccumulatedHBP member */
  LTDC_InitStruct->LTDC_AccumulatedVBP = 0x00;                /*!< Initialize the LTDC_AccumulatedVBP member */
  LTDC_InitStruct->LTDC_AccumulatedActiveW = 0x00;            /*!< Initialize the LTDC_AccumulatedActiveW member */
  LTDC_InitStruct->LTDC_AccumulatedActiveH = 0x00;            /*!< Initialize the LTDC_AccumulatedActiveH member */
  LTDC_InitStruct->LTDC_TotalWidth = 0x00;                    /*!< Initialize the LTDC_TotalWidth member */
  LTDC_InitStruct->LTDC_TotalHeigh = 0x00;                    /*!< Initialize the LTDC_TotalHeigh member */
  LTDC_InitStruct->LTDC_BackgroundRedValue = 0x00;            /*!< Initialize the LTDC_BackgroundRedValue member */
  LTDC_InitStruct->LTDC_BackgroundGreenValue = 0x00;          /*!< Initialize the LTDC_BackgroundGreenValue member */
  LTDC_InitStruct->LTDC_BackgroundBlueValue = 0x00;           /*!< Initialize the LTDC_BackgroundBlueValue member */
}

/**
  * @brief  Enables or disables the LTDC Controller.
  * @param  NewState: new state of the LTDC peripheral.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */

void LTDC_Cmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable LTDC by setting LTDCEN bit */
    LTDC->GCR |= (uint32_t)LTDC_GCR_LTDCEN;
  }
  else
  {
    /* Disable LTDC by clearing LTDCEN bit */
    LTDC->GCR &= ~(uint32_t)LTDC_GCR_LTDCEN;
  }
}

/**
  * @brief  Enables or disables Dither.
  * @param  NewState: new state of the Dither.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */

void LTDC_DitherCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable Dither by setting DTEN bit */
    LTDC->GCR |= (uint32_t)LTDC_GCR_DTEN;
  }
  else
  {
    /* Disable Dither by clearing DTEN bit */
    LTDC->GCR &= ~(uint32_t)LTDC_GCR_DTEN;
  }
}

/**
  * @brief  Get the dither RGB width.
  * @param  LTDC_RGB_InitStruct: pointer to a LTDC_RGBTypeDef structure that contains
  *         the Dither RGB width.
  * @retval None
  */

LTDC_RGBTypeDef LTDC_GetRGBWidth(void)
{
  LTDC_RGBTypeDef LTDC_RGB_InitStruct;

  LTDC->GCR &= (uint32_t)GCR_MASK;

  LTDC_RGB_InitStruct.LTDC_BlueWidth = (uint32_t)((LTDC->GCR >> 4) & 0x7);
  LTDC_RGB_InitStruct.LTDC_GreenWidth = (uint32_t)((LTDC->GCR >> 8) & 0x7);
  LTDC_RGB_InitStruct.LTDC_RedWidth = (uint32_t)((LTDC->GCR >> 12) & 0x7);

  return LTDC_RGB_InitStruct;
}

/**
  * @brief  Fills each LTDC_RGBStruct member with its default value.
  * @param  LTDC_RGB_InitStruct: pointer to a LTDC_RGBTypeDef structure which will
  *         be initialized.
  * @retval None
  */

void LTDC_RGBStructInit(LTDC_RGBTypeDef* LTDC_RGB_InitStruct)
{
  LTDC_RGB_InitStruct->LTDC_BlueWidth = 0x02;
  LTDC_RGB_InitStruct->LTDC_GreenWidth = 0x02;
  LTDC_RGB_InitStruct->LTDC_RedWidth = 0x02;
}


/**
  * @brief  Define the position of the line interrupt .
  * @param  LTDC_LIPositionConfig: Line Interrupt Position.
  * @retval None
  */

void LTDC_LIPConfig(uint32_t LTDC_LIPositionConfig)
{
  /* Check the parameters */
  assert_param(IS_LTDC_LIPOS(LTDC_LIPositionConfig));

  /* Sets the Line Interrupt position */
  LTDC->LIPCR = (uint32_t)LTDC_LIPositionConfig;
}

/**
  * @brief  reload layers registers with new parameters 
  * @param  LTDC_Reload: specifies the type of reload.
  *   This parameter can be one of the following values:
  *     @arg LTDC_IMReload: Vertical blanking reload.
  *     @arg LTDC_VBReload: Immediate reload.  
  * @retval None
  */

void LTDC_ReloadConfig(uint32_t LTDC_Reload)
{
  /* Check the parameters */
  assert_param(IS_LTDC_RELOAD(LTDC_Reload));

  /* Sets the Reload type */
  LTDC->SRCR = (uint32_t)LTDC_Reload;
}


/**
  * @brief  Initializes the LTDC Layer according to the specified parameters
  *         in the LTDC_LayerStruct.
  * @note   This function can be used only when the LTDC is disabled.
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2    
  * @param  LTDC_LayerStruct: pointer to a LTDC_LayerTypeDef structure that contains
  *         the configuration information for the specified LTDC peripheral.
  * @retval None
  */

void LTDC_LayerInit(LTDC_Layer_TypeDef* LTDC_Layerx, LTDC_Layer_InitTypeDef* LTDC_Layer_InitStruct)
{

  uint32_t whsppos = 0;
  uint32_t wvsppos = 0;
  uint32_t dcgreen = 0;
  uint32_t dcred = 0;
  uint32_t dcalpha = 0;
  uint32_t cfbp = 0;

/* Check the parameters */
  assert_param(IS_LTDC_Pixelformat(LTDC_Layer_InitStruct->LTDC_PixelFormat));
  assert_param(IS_LTDC_BlendingFactor1(LTDC_Layer_InitStruct->LTDC_BlendingFactor_1));
  assert_param(IS_LTDC_BlendingFactor2(LTDC_Layer_InitStruct->LTDC_BlendingFactor_2));
  assert_param(IS_LTDC_HCONFIGST(LTDC_Layer_InitStruct->LTDC_HorizontalStart));
  assert_param(IS_LTDC_HCONFIGSP(LTDC_Layer_InitStruct->LTDC_HorizontalStop));
  assert_param(IS_LTDC_VCONFIGST(LTDC_Layer_InitStruct->LTDC_VerticalStart));
  assert_param(IS_LTDC_VCONFIGSP(LTDC_Layer_InitStruct->LTDC_VerticalStop));  
  assert_param(IS_LTDC_DEFAULTCOLOR(LTDC_Layer_InitStruct->LTDC_DefaultColorBlue));
  assert_param(IS_LTDC_DEFAULTCOLOR(LTDC_Layer_InitStruct->LTDC_DefaultColorGreen));
  assert_param(IS_LTDC_DEFAULTCOLOR(LTDC_Layer_InitStruct->LTDC_DefaultColorRed));
  assert_param(IS_LTDC_DEFAULTCOLOR(LTDC_Layer_InitStruct->LTDC_DefaultColorAlpha));
  assert_param(IS_LTDC_CFBP(LTDC_Layer_InitStruct->LTDC_CFBPitch));
  assert_param(IS_LTDC_CFBLL(LTDC_Layer_InitStruct->LTDC_CFBLineLength));
  assert_param(IS_LTDC_CFBLNBR(LTDC_Layer_InitStruct->LTDC_CFBLineNumber));

  /* Configures the horizontal start and stop position */
  whsppos = LTDC_Layer_InitStruct->LTDC_HorizontalStop << 16;
  LTDC_Layerx->WHPCR &= ~(LTDC_LxWHPCR_WHSTPOS | LTDC_LxWHPCR_WHSPPOS);
  LTDC_Layerx->WHPCR = (LTDC_Layer_InitStruct->LTDC_HorizontalStart | whsppos);

  /* Configures the vertical start and stop position */
  wvsppos = LTDC_Layer_InitStruct->LTDC_VerticalStop << 16;
  LTDC_Layerx->WVPCR &= ~(LTDC_LxWVPCR_WVSTPOS | LTDC_LxWVPCR_WVSPPOS);
  LTDC_Layerx->WVPCR  = (LTDC_Layer_InitStruct->LTDC_VerticalStart | wvsppos);

  /* Specifies the pixel format */
  LTDC_Layerx->PFCR &= ~(LTDC_LxPFCR_PF);
  LTDC_Layerx->PFCR = (LTDC_Layer_InitStruct->LTDC_PixelFormat);

  /* Configures the default color values */
  dcgreen = (LTDC_Layer_InitStruct->LTDC_DefaultColorGreen << 8);
  dcred = (LTDC_Layer_InitStruct->LTDC_DefaultColorRed << 16);
  dcalpha = (LTDC_Layer_InitStruct->LTDC_DefaultColorAlpha << 24);
  LTDC_Layerx->DCCR &=  ~(LTDC_LxDCCR_DCBLUE | LTDC_LxDCCR_DCGREEN | LTDC_LxDCCR_DCRED | LTDC_LxDCCR_DCALPHA);
  LTDC_Layerx->DCCR = (LTDC_Layer_InitStruct->LTDC_DefaultColorBlue | dcgreen | \
                        dcred | dcalpha);

  /* Specifies the constant alpha value */      
  LTDC_Layerx->CACR &= ~(LTDC_LxCACR_CONSTA);
  LTDC_Layerx->CACR = (LTDC_Layer_InitStruct->LTDC_ConstantAlpha);

  /* Specifies the blending factors */
  LTDC_Layerx->BFCR &= ~(LTDC_LxBFCR_BF2 | LTDC_LxBFCR_BF1);
  LTDC_Layerx->BFCR = (LTDC_Layer_InitStruct->LTDC_BlendingFactor_1 | LTDC_Layer_InitStruct->LTDC_BlendingFactor_2);

  /* Configures the color frame buffer start address */
  LTDC_Layerx->CFBAR &= ~(LTDC_LxCFBAR_CFBADD);
  LTDC_Layerx->CFBAR = (LTDC_Layer_InitStruct->LTDC_CFBStartAdress);

  /* Configures the color frame buffer pitch in byte */
  cfbp = (LTDC_Layer_InitStruct->LTDC_CFBPitch << 16);
  LTDC_Layerx->CFBLR  &= ~(LTDC_LxCFBLR_CFBLL | LTDC_LxCFBLR_CFBP);
  LTDC_Layerx->CFBLR  = (LTDC_Layer_InitStruct->LTDC_CFBLineLength | cfbp);

  /* Configures the frame buffer line number */
  LTDC_Layerx->CFBLNR  &= ~(LTDC_LxCFBLNR_CFBLNBR);
  LTDC_Layerx->CFBLNR  = (LTDC_Layer_InitStruct->LTDC_CFBLineNumber);

}

/**
  * @brief  Fills each LTDC_Layer_InitStruct member with its default value.
  * @param  LTDC_Layer_InitStruct: pointer to a LTDC_LayerTypeDef structure which will
  *         be initialized.
  * @retval None
  */

void LTDC_LayerStructInit(LTDC_Layer_InitTypeDef * LTDC_Layer_InitStruct)
{
  /*--------------- Reset Layer structure parameters values -------------------*/

  /*!< Initialize the horizontal limit member */
  LTDC_Layer_InitStruct->LTDC_HorizontalStart = 0x00;
  LTDC_Layer_InitStruct->LTDC_HorizontalStop = 0x00;

  /*!< Initialize the vertical limit member */
  LTDC_Layer_InitStruct->LTDC_VerticalStart = 0x00;
  LTDC_Layer_InitStruct->LTDC_VerticalStop = 0x00;

  /*!< Initialize the pixel format member */
  LTDC_Layer_InitStruct->LTDC_PixelFormat = LTDC_Pixelformat_ARGB8888;

  /*!< Initialize the constant alpha value */
  LTDC_Layer_InitStruct->LTDC_ConstantAlpha = 0xFF;

  /*!< Initialize the default color values */
  LTDC_Layer_InitStruct->LTDC_DefaultColorBlue = 0x00;
  LTDC_Layer_InitStruct->LTDC_DefaultColorGreen = 0x00;
  LTDC_Layer_InitStruct->LTDC_DefaultColorRed = 0x00;
  LTDC_Layer_InitStruct->LTDC_DefaultColorAlpha = 0x00;

  /*!< Initialize the blending factors */
  LTDC_Layer_InitStruct->LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_PAxCA;
  LTDC_Layer_InitStruct->LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_PAxCA;

  /*!< Initialize the frame buffer start address */
  LTDC_Layer_InitStruct->LTDC_CFBStartAdress = 0x00;

  /*!< Initialize the frame buffer pitch and line length */
  LTDC_Layer_InitStruct->LTDC_CFBLineLength = 0x00;
  LTDC_Layer_InitStruct->LTDC_CFBPitch = 0x00;

  /*!< Initialize the frame buffer line number */
  LTDC_Layer_InitStruct->LTDC_CFBLineNumber = 0x00;
}


/**
  * @brief  Enables or disables the LTDC_Layer Controller.
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2
  * @param  NewState: new state of the LTDC_Layer peripheral.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */

void LTDC_LayerCmd(LTDC_Layer_TypeDef* LTDC_Layerx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable LTDC_Layer by setting LEN bit */
    LTDC_Layerx->CR |= (uint32_t)LTDC_LxCR_LEN;
  }
  else
  {
    /* Disable LTDC_Layer by clearing LEN bit */
    LTDC_Layerx->CR &= ~(uint32_t)LTDC_LxCR_LEN;
  }
}


/**
  * @brief  Get the current position.
  * @param  LTDC_Pos_InitStruct: pointer to a LTDC_PosTypeDef structure that contains
  *         the current position.
  * @retval None
  */

LTDC_PosTypeDef LTDC_GetPosStatus(void)
{
  LTDC_PosTypeDef LTDC_Pos_InitStruct;

  LTDC->CPSR &= ~(LTDC_CPSR_CYPOS | LTDC_CPSR_CXPOS);

  LTDC_Pos_InitStruct.LTDC_POSX = (uint32_t)(LTDC->CPSR >> 16);
  LTDC_Pos_InitStruct.LTDC_POSY = (uint32_t)(LTDC->CPSR & 0xFFFF);

  return LTDC_Pos_InitStruct;
}

/**
  * @brief  Fills each LTDC_Pos_InitStruct member with its default value.
  * @param  LTDC_Pos_InitStruct: pointer to a LTDC_PosTypeDef structure which will
  *         be initialized.
  * @retval None
  */

void LTDC_PosStructInit(LTDC_PosTypeDef* LTDC_Pos_InitStruct)
{
  LTDC_Pos_InitStruct->LTDC_POSX = 0x00;
  LTDC_Pos_InitStruct->LTDC_POSY = 0x00;
}

/**
  * @brief  Checks whether the specified LTDC's flag is set or not.
  * @param  LTDC_CD: specifies the flag to check.
  *   This parameter can be one of the following values:
  *     @arg LTDC_CD_VDES: vertical data enable current status.
  *     @arg LTDC_CD_HDES: horizontal data enable current status.
  *     @arg LTDC_CD_VSYNC:  Vertical Synchronization current status.
  *     @arg LTDC_CD_HSYNC:  Horizontal Synchronization current status.
  * @retval The new state of LTDC_CD (SET or RESET).
  */

FlagStatus LTDC_GetCDStatus(uint32_t LTDC_CD)
{
  FlagStatus bitstatus;

  /* Check the parameters */
  assert_param(IS_LTDC_GET_CD(LTDC_CD));

  if ((LTDC->CDSR & LTDC_CD) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Set and configure the color keying.
  * @param  LTDC_colorkeying_InitStruct: pointer to a LTDC_ColorKeying_InitTypeDef 
  *         structure that contains the color keying configuration.
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2   
  * @retval None
  */

void LTDC_ColorKeyingConfig(LTDC_Layer_TypeDef* LTDC_Layerx, LTDC_ColorKeying_InitTypeDef* LTDC_colorkeying_InitStruct, FunctionalState NewState)
{ 
  uint32_t ckgreen = 0;
  uint32_t ckred = 0;

  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_LTDC_CKEYING(LTDC_colorkeying_InitStruct->LTDC_ColorKeyBlue));
  assert_param(IS_LTDC_CKEYING(LTDC_colorkeying_InitStruct->LTDC_ColorKeyGreen));
  assert_param(IS_LTDC_CKEYING(LTDC_colorkeying_InitStruct->LTDC_ColorKeyRed));
  
  if (NewState != DISABLE)
  {
    /* Enable LTDC color keying by setting COLKEN bit */
    LTDC_Layerx->CR |= (uint32_t)LTDC_LxCR_COLKEN;
    
    /* Sets the color keying values */
    ckgreen = (LTDC_colorkeying_InitStruct->LTDC_ColorKeyGreen << 8);
    ckred = (LTDC_colorkeying_InitStruct->LTDC_ColorKeyRed << 16);
    LTDC_Layerx->CKCR  &= ~(LTDC_LxCKCR_CKBLUE | LTDC_LxCKCR_CKGREEN | LTDC_LxCKCR_CKRED);
    LTDC_Layerx->CKCR |= (LTDC_colorkeying_InitStruct->LTDC_ColorKeyBlue | ckgreen | ckred);
  }
  else
  {
    /* Disable LTDC color keying by clearing COLKEN bit */
    LTDC_Layerx->CR &= ~(uint32_t)LTDC_LxCR_COLKEN;
  }
  
  /* Reload shadow register */
  LTDC->SRCR = LTDC_IMReload;
}

/**
  * @brief  Fills each LTDC_colorkeying_InitStruct member with its default value.
  * @param  LTDC_colorkeying_InitStruct: pointer to a LTDC_ColorKeying_InitTypeDef structure which will
  *         be initialized.
  * @retval None
  */

void LTDC_ColorKeyingStructInit(LTDC_ColorKeying_InitTypeDef* LTDC_colorkeying_InitStruct)
{
  /*!< Initialize the color keying values */
  LTDC_colorkeying_InitStruct->LTDC_ColorKeyBlue = 0x00;
  LTDC_colorkeying_InitStruct->LTDC_ColorKeyGreen = 0x00;
  LTDC_colorkeying_InitStruct->LTDC_ColorKeyRed = 0x00;
}


/**
  * @brief  Enables or disables CLUT.
  * @param  NewState: new state of CLUT.
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2  
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */

void LTDC_CLUTCmd(LTDC_Layer_TypeDef* LTDC_Layerx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable CLUT by setting CLUTEN bit */
    LTDC_Layerx->CR |= (uint32_t)LTDC_LxCR_CLUTEN;
  }
  else
  {
    /* Disable CLUT by clearing CLUTEN bit */
    LTDC_Layerx->CR &= ~(uint32_t)LTDC_LxCR_CLUTEN;
  }
  
  /* Reload shadow register */
  LTDC->SRCR = LTDC_IMReload;
}

/**
  * @brief  configure the CLUT.
  * @param  LTDC_CLUT_InitStruct: pointer to a LTDC_CLUT_InitTypeDef structure that contains
  *         the CLUT configuration.
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2   
  * @retval None
  */

void LTDC_CLUTInit(LTDC_Layer_TypeDef* LTDC_Layerx, LTDC_CLUT_InitTypeDef* LTDC_CLUT_InitStruct)
{  
  uint32_t green = 0;
  uint32_t red = 0;
  uint32_t clutadd = 0;

  /* Check the parameters */
  assert_param(IS_LTDC_CLUTWR(LTDC_CLUT_InitStruct->LTDC_CLUTAdress));
  assert_param(IS_LTDC_CLUTWR(LTDC_CLUT_InitStruct->LTDC_RedValue));
  assert_param(IS_LTDC_CLUTWR(LTDC_CLUT_InitStruct->LTDC_GreenValue));
  assert_param(IS_LTDC_CLUTWR(LTDC_CLUT_InitStruct->LTDC_BlueValue));
    
  /* Specifies the CLUT address and RGB value */
  green = (LTDC_CLUT_InitStruct->LTDC_GreenValue << 8);
  red = (LTDC_CLUT_InitStruct->LTDC_RedValue << 16);
  clutadd = (LTDC_CLUT_InitStruct->LTDC_CLUTAdress << 24);
  LTDC_Layerx->CLUTWR  = (clutadd | LTDC_CLUT_InitStruct->LTDC_BlueValue | \
                              green | red);
}

/**
  * @brief  Fills each LTDC_CLUT_InitStruct member with its default value.
  * @param  LTDC_CLUT_InitStruct: pointer to a LTDC_CLUT_InitTypeDef structure which will
  *         be initialized.
  * @retval None
  */

void LTDC_CLUTStructInit(LTDC_CLUT_InitTypeDef* LTDC_CLUT_InitStruct)
{
  /*!< Initialize the CLUT address and RGB values */
  LTDC_CLUT_InitStruct->LTDC_CLUTAdress = 0x00;
  LTDC_CLUT_InitStruct->LTDC_BlueValue = 0x00;
  LTDC_CLUT_InitStruct->LTDC_GreenValue = 0x00;
  LTDC_CLUT_InitStruct->LTDC_RedValue = 0x00;
}


/**
  * @brief  reconfigure the layer position.
  * @param  OffsetX: horizontal offset from start active width .
  * @param  OffsetY: vertical offset from start active height.   
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2   
  * @retval Reload of the shadow registers values must be applied after layer 
  *         position reconfiguration.
  */

void LTDC_LayerPosition(LTDC_Layer_TypeDef* LTDC_Layerx, uint16_t OffsetX, uint16_t OffsetY)
{
  
  uint32_t tempreg, temp;
  uint32_t horizontal_start;
  uint32_t horizontal_stop;
  uint32_t vertical_start;
  uint32_t vertical_stop;
  
  LTDC_Layerx->WHPCR &= ~(LTDC_LxWHPCR_WHSTPOS | LTDC_LxWHPCR_WHSPPOS);
  LTDC_Layerx->WVPCR &= ~(LTDC_LxWVPCR_WVSTPOS | LTDC_LxWVPCR_WVSPPOS);
  
  /* Reconfigures the horizontal and vertical start position */
  tempreg = LTDC->BPCR;
  horizontal_start = (tempreg >> 16) + 1 + OffsetX;
  vertical_start = (tempreg & 0xFFFF) + 1 + OffsetY;
  
  /* Reconfigures the horizontal and vertical stop position */
  /* Get the number of byte per pixel */
  
  tempreg = LTDC_Layerx->PFCR;
  
  if (tempreg == LTDC_Pixelformat_ARGB8888)
  {
    temp = 4;
  }
  else if (tempreg == LTDC_Pixelformat_RGB888)
  {
    temp = 3;
  }
  else if ((tempreg == LTDC_Pixelformat_ARGB4444) || 
          (tempreg == LTDC_Pixelformat_RGB565)    ||  
          (tempreg == LTDC_Pixelformat_ARGB1555)  ||
          (tempreg == LTDC_Pixelformat_AL88))
  {
    temp = 2;  
  }
  else
  {
    temp = 1;
  }  
    
  tempreg = LTDC_Layerx->CFBLR;
  horizontal_stop = (((tempreg & 0x1FFF) - 3)/temp) + horizontal_start - 1;
  
  tempreg = LTDC_Layerx->CFBLNR;
  vertical_stop = (tempreg & 0x7FF) + vertical_start - 1;  
  
  LTDC_Layerx->WHPCR = horizontal_start | (horizontal_stop << 16);
  LTDC_Layerx->WVPCR = vertical_start | (vertical_stop << 16);  
}
  
/**
  * @brief  reconfigure constant alpha.
  * @param  ConstantAlpha: constant alpha value.
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2    
  * @retval Reload of the shadow registers values must be applied after constant 
  *         alpha reconfiguration.         
  */

void LTDC_LayerAlpha(LTDC_Layer_TypeDef* LTDC_Layerx, uint8_t ConstantAlpha)
{  
  /* reconfigure the constant alpha value */      
  LTDC_Layerx->CACR = ConstantAlpha;
}

/**
  * @brief  reconfigure layer address.
  * @param  Address: The color frame buffer start address.
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2     
  * @retval Reload of the shadow registers values must be applied after layer 
  *         address reconfiguration.
  */

void LTDC_LayerAddress(LTDC_Layer_TypeDef* LTDC_Layerx, uint32_t Address)
{
  /* Reconfigures the color frame buffer start address */
  LTDC_Layerx->CFBAR = Address;
}
  
/**
  * @brief  reconfigure layer size.
  * @param  Width: layer window width.
  * @param  Height: layer window height.   
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2   
  * @retval Reload of the shadow registers values must be applied after layer 
  *         size reconfiguration.
  */

void LTDC_LayerSize(LTDC_Layer_TypeDef* LTDC_Layerx, uint32_t Width, uint32_t Height)
{

  uint8_t temp;
  uint32_t tempreg;
  uint32_t horizontal_start;
  uint32_t horizontal_stop;
  uint32_t vertical_start;
  uint32_t vertical_stop;  
  
  tempreg = LTDC_Layerx->PFCR;
  
  if (tempreg == LTDC_Pixelformat_ARGB8888)
  {
    temp = 4;
  }
  else if (tempreg == LTDC_Pixelformat_RGB888)
  {
    temp = 3;
  }
  else if ((tempreg == LTDC_Pixelformat_ARGB4444) || \
          (tempreg == LTDC_Pixelformat_RGB565)    || \
          (tempreg == LTDC_Pixelformat_ARGB1555)  || \
          (tempreg == LTDC_Pixelformat_AL88))
  {
    temp = 2;  
  }
  else
  {
    temp = 1;
  }

  /* update horizontal and vertical stop */
  tempreg = LTDC_Layerx->WHPCR;
  horizontal_start = (tempreg & 0x1FFF);
  horizontal_stop = Width + horizontal_start - 1;  

  tempreg = LTDC_Layerx->WVPCR;
  vertical_start = (tempreg & 0x1FFF);
  vertical_stop = Height + vertical_start - 1;  
  
  LTDC_Layerx->WHPCR = horizontal_start | (horizontal_stop << 16);
  LTDC_Layerx->WVPCR = vertical_start | (vertical_stop << 16);  

  /* Reconfigures the color frame buffer pitch in byte */
  LTDC_Layerx->CFBLR  = ((Width * temp) << 16) | ((Width * temp) + 3);  

  /* Reconfigures the frame buffer line number */
  LTDC_Layerx->CFBLNR  = Height;  
  
}

/**
  * @brief  reconfigure layer pixel format.
  * @param  PixelFormat: reconfigure the pixel format, this parameter can be 
  *         one of the following values:@ref LTDC_Pixelformat.   
  * @param  LTDC_layerx: Select the layer to be configured, this parameter can be 
  *         one of the following values: LTDC_Layer1, LTDC_Layer2   
  * @retval Reload of the shadow registers values must be applied after layer 
  *         pixel format reconfiguration.
  */

void LTDC_LayerPixelFormat(LTDC_Layer_TypeDef* LTDC_Layerx, uint32_t PixelFormat)
{

  uint8_t temp;
  uint32_t tempreg;
  
  tempreg = LTDC_Layerx->PFCR;
  
  if (tempreg == LTDC_Pixelformat_ARGB8888)
  {
    temp = 4;
  }
  else if (tempreg == LTDC_Pixelformat_RGB888)
  {
    temp = 3;
  }
  else if ((tempreg == LTDC_Pixelformat_ARGB4444) || \
          (tempreg == LTDC_Pixelformat_RGB565)    || \
          (tempreg == LTDC_Pixelformat_ARGB1555)  || \
          (tempreg == LTDC_Pixelformat_AL88))  
  {
    temp = 2;  
  }
  else
  {
    temp = 1;
  }
  
  tempreg = (LTDC_Layerx->CFBLR >> 16);
  tempreg = (tempreg / temp); 
  
  if (PixelFormat == LTDC_Pixelformat_ARGB8888)
  {
    temp = 4;
  }
  else if (PixelFormat == LTDC_Pixelformat_RGB888)
  {
    temp = 3;
  }
  else if ((PixelFormat == LTDC_Pixelformat_ARGB4444) || \
          (PixelFormat == LTDC_Pixelformat_RGB565)    || \
          (PixelFormat == LTDC_Pixelformat_ARGB1555)  || \
          (PixelFormat == LTDC_Pixelformat_AL88))
  {
    temp = 2;  
  }
  else
  {
    temp = 1;
  }
  
  /* Reconfigures the color frame buffer pitch in byte */
  LTDC_Layerx->CFBLR  = ((tempreg * temp) << 16) | ((tempreg * temp) + 3);  

  /* Reconfigures the color frame buffer start address */
  LTDC_Layerx->PFCR = PixelFormat;
    
}
    
/**
  * @}
  */

/** @defgroup LTDC_Group2 Interrupts and flags management functions
 *  @brief   Interrupts and flags management functions
 *
@verbatim
 ===============================================================================
            ##### Interrupts and flags management functions #####
 ===============================================================================

    [..] This section provides functions allowing to configure the LTDC Interrupts 
         and to get the status and clear flags and Interrupts pending bits.
  
    [..] The LTDC provides 4 Interrupts sources and 4 Flags
    
    *** Flags ***
    =============
    [..]
      (+) LTDC_FLAG_LI:   Line Interrupt flag.
      (+) LTDC_FLAG_FU:   FIFO Underrun Interrupt flag.
      (+) LTDC_FLAG_TERR: Transfer Error Interrupt flag.
      (+) LTDC_FLAG_RR:   Register Reload interrupt flag.
      
    *** Interrupts ***
    ==================
    [..]
      (+) LTDC_IT_LI: Line Interrupt is generated when a programmed line 
                      is reached. The line interrupt position is programmed in 
                      the LTDC_LIPR register.
      (+) LTDC_IT_FU: FIFO Underrun interrupt is generated when a pixel is requested 
                      from an empty layer FIFO
      (+) LTDC_IT_TERR: Transfer Error interrupt is generated when an AHB bus 
                        error occurs during data transfer.
      (+) LTDC_IT_RR: Register Reload interrupt is generated when the shadow 
                      registers reload was performed during the vertical blanking 
                      period.
               
@endverbatim
  * @{
  */

/**
  * @brief  Enables or disables the specified LTDC's interrupts.
  * @param  LTDC_IT: specifies the LTDC interrupts sources to be enabled or disabled.
  *   This parameter can be any combination of the following values:
  *     @arg LTDC_IT_LI: Line Interrupt Enable.
  *     @arg LTDC_IT_FU: FIFO Underrun Interrupt Enable.
  *     @arg LTDC_IT_TERR: Transfer Error Interrupt Enable.
  *     @arg LTDC_IT_RR: Register Reload interrupt enable.  
  * @param NewState: new state of the specified LTDC interrupts.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void LTDC_ITConfig(uint32_t LTDC_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_LTDC_IT(LTDC_IT));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    LTDC->IER |= LTDC_IT;
  }
  else
  {
    LTDC->IER &= (uint32_t)~LTDC_IT;
  }
}

/**
  * @brief  Checks whether the specified LTDC's flag is set or not.
  * @param  LTDC_FLAG: specifies the flag to check.
  *   This parameter can be one of the following values:
  *     @arg LTDC_FLAG_LI:    Line Interrupt flag.
  *     @arg LTDC_FLAG_FU:   FIFO Underrun Interrupt flag.
  *     @arg LTDC_FLAG_TERR: Transfer Error Interrupt flag.
  *     @arg LTDC_FLAG_RR:   Register Reload interrupt flag.
  * @retval The new state of LTDC_FLAG (SET or RESET).
  */
FlagStatus LTDC_GetFlagStatus(uint32_t LTDC_FLAG)
{
  FlagStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_LTDC_FLAG(LTDC_FLAG));

  if ((LTDC->ISR & LTDC_FLAG) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

/**
  * @brief  Clears the LTDC's pending flags.
  * @param  LTDC_FLAG: specifies the flag to clear.
  *   This parameter can be any combination of the following values:
  *     @arg LTDC_FLAG_LI:    Line Interrupt flag.
  *     @arg LTDC_FLAG_FU:   FIFO Underrun Interrupt flag.
  *     @arg LTDC_FLAG_TERR: Transfer Error Interrupt flag.
  *     @arg LTDC_FLAG_RR:   Register Reload interrupt flag.  
  * @retval None
  */
void LTDC_ClearFlag(uint32_t LTDC_FLAG)
{
  /* Check the parameters */
  assert_param(IS_LTDC_FLAG(LTDC_FLAG));

  /* Clear the corresponding LTDC flag */
  LTDC->ICR = (uint32_t)LTDC_FLAG;
}

/**
  * @brief  Checks whether the specified LTDC's interrupt has occurred or not.
  * @param  LTDC_IT: specifies the LTDC interrupts sources to check.
  *   This parameter can be one of the following values:
  *     @arg LTDC_IT_LI:    Line Interrupt Enable.
  *     @arg LTDC_IT_FU:   FIFO Underrun Interrupt Enable.
  *     @arg LTDC_IT_TERR: Transfer Error Interrupt Enable.
  *     @arg LTDC_IT_RR:   Register Reload interrupt Enable.
  * @retval The new state of the LTDC_IT (SET or RESET).
  */
ITStatus LTDC_GetITStatus(uint32_t LTDC_IT)
{
  ITStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_LTDC_IT(LTDC_IT));

  if ((LTDC->ISR & LTDC_IT) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }

  if (((LTDC->IER & LTDC_IT) != (uint32_t)RESET) && (bitstatus != (uint32_t)RESET))
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}


/**
  * @brief  Clears the LTDC's interrupt pending bits.
  * @param  LTDC_IT: specifies the interrupt pending bit to clear.
  *   This parameter can be any combination of the following values:
  *     @arg LTDC_IT_LIE:    Line Interrupt.
  *     @arg LTDC_IT_FUIE:   FIFO Underrun Interrupt.
  *     @arg LTDC_IT_TERRIE: Transfer Error Interrupt.
  *     @arg LTDC_IT_RRIE:   Register Reload interrupt.
  * @retval None
  */
void LTDC_ClearITPendingBit(uint32_t LTDC_IT)
{
  /* Check the parameters */
  assert_param(IS_LTDC_IT(LTDC_IT));

  /* Clear the corresponding LTDC Interrupt */
  LTDC->ICR = (uint32_t)LTDC_IT;
}
/**
  * @}
  */

/**
  * @}
  */ 

/**
  * @}
  */ 

/**
  * @}
  */ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/