stm3210c_eval_lcd.c

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/**
  ******************************************************************************
  * @file    stm3210c_eval_lcd.c
  * @author  MCD Application Team
  * @version $VERSION$
  * @date    $DATE$
  * @brief   This file includes the driver for Liquid Crystal Display (LCD) module
  *          mounted on STM3210C-EVAL evaluation board.
  @verbatim
  ==============================================================================
                     ##### How to use this driver #####
  ==============================================================================  
  [..] 
   (#) This driver is used to drive indirectly an LCD TFT.
   
   (#) This driver supports the AM-240320L8TNQW00H (LCD_ILI9320) and AM240320D5TOQW01H 
       (LCD_ILI9325) LCD mounted on MB785 daughter board 
       
   (#) The ILI9320 and ILI9325 components driver MUST be included with this driver.

   (#) Initialization steps:
       (++) Initialize the LCD using the BSP_LCD_Init() function.
  
   (#) Display on LCD
       (++) Clear the hole LCD using yhe BSP_LCD_Clear() function or only one specified 
            string line using the BSP_LCD_ClearStringLine() function.
       (++) Display a character on the specified line and column using the BSP_LCD_DisplayChar()
            function or a complete string line using the BSP_LCD_DisplayStringAtLine() function.
       (++) Display a string line on the specified position (x,y in pixel) and align mode
            using the BSP_LCD_DisplayStringAtLine() function.          
       (++) Draw and fill a basic shapes (dot, line, rectangle, circle, ellipse, .. bitmap, raw picture) 
            on LCD using a set of functions.    
  @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 "stm3210c_eval_lcd.h"
#include "../../../Utilities/Fonts/fonts.h"
#include "../../../Utilities/Fonts/font24.c"
#include "../../../Utilities/Fonts/font20.c"
#include "../../../Utilities/Fonts/font16.c"
#include "../../../Utilities/Fonts/font12.c"
#include "../../../Utilities/Fonts/font8.c"

/** @addtogroup BSP
  * @{
  */

/** @addtogroup STM3210C_EVAL
  * @{
  */
    
/** @defgroup STM3210C_EVAL_LCD STM3210C_EVAL LCD
  * @{
  */ 


/** @defgroup STM3210C_EVAL_LCD_Private_Defines Private Defines
  * @{
  */
#define POLY_X(Z)              ((int32_t)((Points + (Z))->X))
#define POLY_Y(Z)              ((int32_t)((Points + (Z))->Y))

#define MAX_HEIGHT_FONT         17
#define MAX_WIDTH_FONT          24
#define OFFSET_BITMAP           54
/**
  * @}
  */ 

/** @defgroup STM3210C_EVAL_LCD_Private_Macros Private Macros
  * @{
  */
#define ABS(X)  ((X) > 0 ? (X) : -(X)) 

/**
  * @}
  */ 
    
/** @defgroup STM3210C_EVAL_LCD_Private_Variables Private Variables
  * @{
  */ 
LCD_DrawPropTypeDef DrawProp;

static LCD_DrvTypeDef  *lcd_drv; 

/* Max size of bitmap will based on a font24 (17x24) */
static uint8_t bitmap[MAX_HEIGHT_FONT*MAX_WIDTH_FONT*2+OFFSET_BITMAP] = {0};

/**
  * @}
  */ 

/** @defgroup STM3210C_EVAL_LCD_Private_Functions Private Functions
  * @{
  */ 
static void LCD_DrawPixel(uint16_t Xpos, uint16_t Ypos, uint16_t RGBCode);
static void LCD_DrawChar(uint16_t Xpos, uint16_t Ypos, const uint8_t *c);
static void LCD_SetDisplayWindow(uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height);
/**
  * @}
  */ 


/** @defgroup STM3210C_EVAL_LCD_Exported_Functions Exported Functions
  * @{
  */

/**
  * @brief  Initializes the LCD.
  * @retval LCD state
  */
uint8_t BSP_LCD_Init(void)
{ 
  uint8_t ret = LCD_ERROR;
  
  /* Default value for draw propriety */
  DrawProp.BackColor = 0xFFFF;
  DrawProp.pFont     = &Font24;
  DrawProp.TextColor = 0x0000;
  
  if(ili9320_drv.ReadID() == ILI9320_ID)
  {
    lcd_drv = &ili9320_drv;

    /* LCD Init */   
    lcd_drv->Init();
    
    /* Initialize the font */
    BSP_LCD_SetFont(&LCD_DEFAULT_FONT);

    ret = LCD_OK;
  }
  else if(ili9325_drv.ReadID() == ILI9325_ID)
  {
    lcd_drv = &ili9325_drv;

    /* LCD Init */   
    lcd_drv->Init();
    
    /* Initialize the font */
    BSP_LCD_SetFont(&LCD_DEFAULT_FONT);

    ret = LCD_OK;
  }
  
  return ret;
}

/**
  * @brief  Gets the LCD X size.
  * @retval Used LCD X size
  */
uint32_t BSP_LCD_GetXSize(void)
{
  return(lcd_drv->GetLcdPixelWidth());
}

/**
  * @brief  Gets the LCD Y size.
  * @retval Used LCD Y size
  */
uint32_t BSP_LCD_GetYSize(void)
{
  return(lcd_drv->GetLcdPixelHeight());
}

/**
  * @brief  Gets the LCD text color.
  * @retval Used text color.
  */
uint16_t BSP_LCD_GetTextColor(void)
{
  return DrawProp.TextColor;
}

/**
  * @brief  Gets the LCD background color.
  * @retval Used background color
  */
uint16_t BSP_LCD_GetBackColor(void)
{
  return DrawProp.BackColor;
}

/**
  * @brief  Sets the LCD text color.
  * @param  Color: Text color code RGB(5-6-5)
  * @retval None
  */
void BSP_LCD_SetTextColor(uint16_t Color)
{
  DrawProp.TextColor = Color;
}

/**
  * @brief  Sets the LCD background color.
  * @param  Color: Background color code RGB(5-6-5)
  * @retval None
  */
void BSP_LCD_SetBackColor(uint16_t Color)
{
  DrawProp.BackColor = Color;
}

/**
  * @brief  Sets the LCD text font.
  * @param  pFonts: Font to be used
  * @retval None
  */
void BSP_LCD_SetFont(sFONT *pFonts)
{
  DrawProp.pFont = pFonts;
}

/**
  * @brief  Gets the LCD text font.
  * @retval Used font
  */
sFONT *BSP_LCD_GetFont(void)
{
  return DrawProp.pFont;
}

/**
  * @brief  Clears the hole LCD.
  * @param  Color: Color of the background
  * @retval None
  */
void BSP_LCD_Clear(uint16_t Color)
{ 
  uint32_t counter = 0;
  
  uint32_t color_backup = DrawProp.TextColor; 
  DrawProp.TextColor = Color;
  
  for(counter = 0; counter < BSP_LCD_GetYSize(); counter++)
  {
    BSP_LCD_DrawHLine(0, counter, BSP_LCD_GetXSize());
  }

  DrawProp.TextColor = color_backup; 
  BSP_LCD_SetTextColor(DrawProp.TextColor);
}

/**
  * @brief  Clears the selected line.
  * @param  Line: Line to be cleared
  *          This parameter can be one of the following values:
  *            @arg  0..9: if the Current fonts is Font16x24
  *            @arg  0..19: if the Current fonts is Font12x12 or Font8x12
  *            @arg  0..29: if the Current fonts is Font8x8
  * @retval None
  */
void BSP_LCD_ClearStringLine(uint16_t Line)
{ 
  uint32_t colorbackup = DrawProp.TextColor; 
  DrawProp.TextColor = DrawProp.BackColor;;
    
  /* Draw a rectangle with background color */
  BSP_LCD_FillRect(0, (Line * DrawProp.pFont->Height), BSP_LCD_GetXSize(), DrawProp.pFont->Height);
  
  DrawProp.TextColor = colorbackup;
  BSP_LCD_SetTextColor(DrawProp.TextColor);
}

/**
  * @brief  Displays one character.
  * @param  Xpos: Start column address
  * @param  Ypos: Line where to display the character shape.
  * @param  Ascii: Character ascii code
  *           This parameter must be a number between Min_Data = 0x20 and Max_Data = 0x7E 
  * @retval None
  */
void BSP_LCD_DisplayChar(uint16_t Xpos, uint16_t Ypos, uint8_t Ascii)
{
  LCD_DrawChar(Xpos, Ypos, &DrawProp.pFont->table[(Ascii-' ') *\
    DrawProp.pFont->Height * ((DrawProp.pFont->Width + 7) / 8)]);
}

/**
  * @brief  Displays characters on the LCD.
  * @param  Xpos: X position (in pixel)
  * @param  Ypos: Y position (in pixel)   
  * @param  pText: Pointer to string to display on LCD
  * @param  Mode: Display mode
  *          This parameter can be one of the following values:
  *            @arg  CENTER_MODE
  *            @arg  RIGHT_MODE
  *            @arg  LEFT_MODE   
  * @retval None
  */
void BSP_LCD_DisplayStringAt(uint16_t Xpos, uint16_t Ypos, uint8_t *pText, Line_ModeTypdef Mode)
{
  uint16_t refcolumn = 1, counter = 0;
  uint32_t size = 0, xsize = 0; 
  uint8_t  *ptr = pText;
  
  /* Get the text size */
  while (*ptr++) size ++ ;
  
  /* Characters number per line */
  xsize = (BSP_LCD_GetXSize()/DrawProp.pFont->Width);
  
  switch (Mode)
  {
  case CENTER_MODE:
    {
      refcolumn = Xpos + ((xsize - size)* DrawProp.pFont->Width) / 2;
      break;
    }
  case LEFT_MODE:
    {
      refcolumn = Xpos;
      break;
    }
  case RIGHT_MODE:
    {
      refcolumn =  - Xpos + ((xsize - size)*DrawProp.pFont->Width);
      break;
    }    
  default:
    {
      refcolumn = Xpos;
      break;
    }
  }
  
  /* Send the string character by character on lCD */
  while ((*pText != 0) & (((BSP_LCD_GetXSize() - (counter*DrawProp.pFont->Width)) & 0xFFFF) >= DrawProp.pFont->Width))
  {
    /* Display one character on LCD */
    BSP_LCD_DisplayChar(refcolumn, Ypos, *pText);
    /* Decrement the column position by 16 */
    refcolumn += DrawProp.pFont->Width;
    /* Point on the next character */
    pText++;
    counter++;
  }
}

/**
  * @brief  Displays a character on the LCD.
  * @param  Line: Line where to display the character shape
  *          This parameter can be one of the following values:
  *            @arg  0..9: if the Current fonts is Font16x24  
  *            @arg  0..19: if the Current fonts is Font12x12 or Font8x12
  *            @arg  0..29: if the Current fonts is Font8x8
  * @param  pText: Pointer to string to display on LCD
  * @retval None
  */
void BSP_LCD_DisplayStringAtLine(uint16_t Line, uint8_t *pText)
{
  BSP_LCD_DisplayStringAt(0, LINE(Line),pText, LEFT_MODE);
}

/**
  * @brief  Reads an LCD pixel.
  * @param  Xpos: X position 
  * @param  Ypos: Y position 
  * @retval RGB pixel color
  */
uint16_t BSP_LCD_ReadPixel(uint16_t Xpos, uint16_t Ypos)
{
  uint16_t ret = 0;
  
  if(lcd_drv->ReadPixel != NULL)
  {
    ret = lcd_drv->ReadPixel(Xpos, Ypos);
  }
    
  return ret;
}

/**
  * @brief  Draws an horizontal line.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Length: Line length
  * @retval None
  */
void BSP_LCD_DrawHLine(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
{
  uint32_t index = 0;
  
  if(lcd_drv->DrawHLine != NULL)
  {
    lcd_drv->DrawHLine(DrawProp.TextColor, Xpos, Ypos, Length);
  }
  else
  {
    for(index = 0; index < Length; index++)
    {
      LCD_DrawPixel((Xpos + index), Ypos, DrawProp.TextColor);
    }
  }
}

/**
  * @brief  Draws a vertical line.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Length: Line length
  * @retval None
  */
void BSP_LCD_DrawVLine(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
{
  uint32_t index = 0;
  
  if(lcd_drv->DrawVLine != NULL)
  {
    lcd_drv->DrawVLine(DrawProp.TextColor, Xpos, Ypos, Length);
  }
  else
  {
    for(index = 0; index < Length; index++)
    {
      LCD_DrawPixel(Xpos, Ypos + index, DrawProp.TextColor);
    }
  }
}

/**
  * @brief  Draws an uni-line (between two points).
  * @param  x1: Point 1 X position
  * @param  y1: Point 1 Y position
  * @param  x2: Point 2 X position
  * @param  y2: Point 2 Y position
  * @retval None
  */
void BSP_LCD_DrawLine(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2)
{
  int16_t deltax = 0, deltay = 0, x = 0, y = 0, xinc1 = 0, xinc2 = 0, 
  yinc1 = 0, yinc2 = 0, den = 0, num = 0, numadd = 0, numpixels = 0, 
  curpixel = 0;
  
  deltax = ABS(x2 - x1);        /* The difference between the x's */
  deltay = ABS(y2 - y1);        /* The difference between the y's */
  x = x1;                       /* Start x off at the first pixel */
  y = y1;                       /* Start y off at the first pixel */
  
  if (x2 >= x1)                 /* The x-values are increasing */
  {
    xinc1 = 1;
    xinc2 = 1;
  }
  else                          /* The x-values are decreasing */
  {
    xinc1 = -1;
    xinc2 = -1;
  }
  
  if (y2 >= y1)                 /* The y-values are increasing */
  {
    yinc1 = 1;
    yinc2 = 1;
  }
  else                          /* The y-values are decreasing */
  {
    yinc1 = -1;
    yinc2 = -1;
  }
  
  if (deltax >= deltay)         /* There is at least one x-value for every y-value */
  {
    xinc1 = 0;                  /* Don't change the x when numerator >= denominator */
    yinc2 = 0;                  /* Don't change the y for every iteration */
    den = deltax;
    num = deltax / 2;
    numadd = deltay;
    numpixels = deltax;         /* There are more x-values than y-values */
  }
  else                          /* There is at least one y-value for every x-value */
  {
    xinc2 = 0;                  /* Don't change the x for every iteration */
    yinc1 = 0;                  /* Don't change the y when numerator >= denominator */
    den = deltay;
    num = deltay / 2;
    numadd = deltax;
    numpixels = deltay;         /* There are more y-values than x-values */
  }
  
  for (curpixel = 0; curpixel <= numpixels; curpixel++)
  {
    LCD_DrawPixel(x, y, DrawProp.TextColor);  /* Draw the current pixel */
    num += numadd;                            /* Increase the numerator by the top of the fraction */
    if (num >= den)                           /* Check if numerator >= denominator */
    {
      num -= den;                             /* Calculate the new numerator value */
      x += xinc1;                             /* Change the x as appropriate */
      y += yinc1;                             /* Change the y as appropriate */
    }
    x += xinc2;                               /* Change the x as appropriate */
    y += yinc2;                               /* Change the y as appropriate */
  }
}

/**
  * @brief  Draws a rectangle.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Width: Rectangle width  
  * @param  Height: Rectangle height
  * @retval None
  */
void BSP_LCD_DrawRect(uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height)
{
  /* Draw horizontal lines */
  BSP_LCD_DrawHLine(Xpos, Ypos, Width);
  BSP_LCD_DrawHLine(Xpos, (Ypos+ Height), Width);
  
  /* Draw vertical lines */
  BSP_LCD_DrawVLine(Xpos, Ypos, Height);
  BSP_LCD_DrawVLine((Xpos + Width), Ypos, Height);
}
                            
/**
  * @brief  Draws a circle.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Radius: Circle radius
  * @retval None
  */
void BSP_LCD_DrawCircle(uint16_t Xpos, uint16_t Ypos, uint16_t Radius)
{
  int32_t  D;       /* Decision Variable */ 
  uint32_t  CurX;   /* Current X Value */
  uint32_t  CurY;   /* Current Y Value */ 
  
  D = 3 - (Radius << 1);
  CurX = 0;
  CurY = Radius;
  
  while (CurX <= CurY)
  {
    LCD_DrawPixel((Xpos + CurX), (Ypos - CurY), DrawProp.TextColor);

    LCD_DrawPixel((Xpos - CurX), (Ypos - CurY), DrawProp.TextColor);

    LCD_DrawPixel((Xpos + CurY), (Ypos - CurX), DrawProp.TextColor);

    LCD_DrawPixel((Xpos - CurY), (Ypos - CurX), DrawProp.TextColor);

    LCD_DrawPixel((Xpos + CurX), (Ypos + CurY), DrawProp.TextColor);

    LCD_DrawPixel((Xpos - CurX), (Ypos + CurY), DrawProp.TextColor);

    LCD_DrawPixel((Xpos + CurY), (Ypos + CurX), DrawProp.TextColor);

    LCD_DrawPixel((Xpos - CurY), (Ypos + CurX), DrawProp.TextColor);   

    /* Initialize the font */
    BSP_LCD_SetFont(&LCD_DEFAULT_FONT);

    if (D < 0)
    { 
      D += (CurX << 2) + 6;
    }
    else
    {
      D += ((CurX - CurY) << 2) + 10;
      CurY--;
    }
    CurX++;
  } 
}

/**
  * @brief  Draws an poly-line (between many points).
  * @param  Points: Pointer to the points array
  * @param  PointCount: Number of points
  * @retval None
  */
void BSP_LCD_DrawPolygon(pPoint Points, uint16_t PointCount)
{
  int16_t X = 0, Y = 0;

  if(PointCount < 2)
  {
    return;
  }

  BSP_LCD_DrawLine(Points->X, Points->Y, (Points+PointCount-1)->X, (Points+PointCount-1)->Y);
  
  while(--PointCount)
  {
    X = Points->X;
    Y = Points->Y;
    Points++;
    BSP_LCD_DrawLine(X, Y, Points->X, Points->Y);
  }
  
}

/**
  * @brief  Draws an ellipse on LCD.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  XRadius: Ellipse X radius
  * @param  YRadius: Ellipse Y radius
  * @retval None
  */
void BSP_LCD_DrawEllipse(int Xpos, int Ypos, int XRadius, int YRadius)
{
  int x = 0, y = -YRadius, err = 2-2*XRadius, e2;
  float K = 0, rad1 = 0, rad2 = 0;
  
  rad1 = XRadius;
  rad2 = YRadius;
  
  K = (float)(rad2/rad1);
  
  do {      
    LCD_DrawPixel((Xpos-(uint16_t)(x/K)), (Ypos+y), DrawProp.TextColor);
    LCD_DrawPixel((Xpos+(uint16_t)(x/K)), (Ypos+y), DrawProp.TextColor);
    LCD_DrawPixel((Xpos+(uint16_t)(x/K)), (Ypos-y), DrawProp.TextColor);
    LCD_DrawPixel((Xpos-(uint16_t)(x/K)), (Ypos-y), DrawProp.TextColor);      
    
    e2 = err;
    if (e2 <= x) {
      err += ++x*2+1;
      if (-y == x && e2 <= y) e2 = 0;
    }
    if (e2 > y) err += ++y*2+1;     
  }
  while (y <= 0);
}

/**
  * @brief  Draws a bitmap picture (16 bpp).
  * @param  Xpos: Bmp X position in the LCD
  * @param  Ypos: Bmp Y position in the LCD
  * @param  pbmp: Pointer to Bmp picture address.
  * @retval None
  */
void BSP_LCD_DrawBitmap(uint16_t Xpos, uint16_t Ypos, uint8_t *pbmp)
{
  uint32_t height = 0;
  uint32_t width  = 0;
  
  
  /* Read bitmap width */
  width = *(uint16_t *) (pbmp + 18);
  width |= (*(uint16_t *) (pbmp + 20)) << 16;
  
  /* Read bitmap height */
  height = *(uint16_t *) (pbmp + 22);
  height |= (*(uint16_t *) (pbmp + 24)) << 16; 
  
  LCD_SetDisplayWindow(Xpos, Ypos, width, height);
  
  if(lcd_drv->DrawBitmap != NULL)
  {
    lcd_drv->DrawBitmap(Xpos, Ypos, pbmp);
  } 
  LCD_SetDisplayWindow(0, 0, BSP_LCD_GetXSize(), BSP_LCD_GetYSize());
}

/**
  * @brief  Draws RGB Image (16 bpp).
  * @param  Xpos:  X position in the LCD
  * @param  Ypos:  Y position in the LCD
  * @param  Xsize: X size in the LCD
  * @param  Ysize: Y size in the LCD
  * @param  pdata: Pointer to the RGB Image address.
  * @retval None
  */
void BSP_LCD_DrawRGBImage(uint16_t Xpos, uint16_t Ypos, uint16_t Xsize, uint16_t Ysize, uint8_t *pdata)
{
  
  LCD_SetDisplayWindow(Xpos, Ypos, Xsize, Ysize);
  
  if(lcd_drv->DrawRGBImage != NULL)
  {
    lcd_drv->DrawRGBImage(Xpos, Ypos, Xsize, Ysize, pdata);
  } 
  LCD_SetDisplayWindow(0, 0, BSP_LCD_GetXSize(), BSP_LCD_GetYSize());
}

/**
  * @brief  Draws a full rectangle.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Width: Rectangle width  
  * @param  Height: Rectangle height
  * @retval None
  */
void BSP_LCD_FillRect(uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height)
{
  BSP_LCD_SetTextColor(DrawProp.TextColor);
  do
  {
    BSP_LCD_DrawHLine(Xpos, Ypos++, Width);    
  }
  while(Height--);
}

/**
  * @brief  Draws a full circle.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  Radius: Circle radius
  * @retval None
  */
void BSP_LCD_FillCircle(uint16_t Xpos, uint16_t Ypos, uint16_t Radius)
{
  int32_t  D;        /* Decision Variable */ 
  uint32_t  CurX;    /* Current X Value */
  uint32_t  CurY;    /* Current Y Value */ 
  
  D = 3 - (Radius << 1);

  CurX = 0;
  CurY = Radius;
  
  BSP_LCD_SetTextColor(DrawProp.TextColor);

  while (CurX <= CurY)
  {
    if(CurY > 0) 
    {
      BSP_LCD_DrawHLine(Xpos - CurY, Ypos + CurX, 2*CurY);
      BSP_LCD_DrawHLine(Xpos - CurY, Ypos - CurX, 2*CurY);
    }

    if(CurX > 0) 
    {
      BSP_LCD_DrawHLine(Xpos - CurX, Ypos - CurY, 2*CurX);
      BSP_LCD_DrawHLine(Xpos - CurX, Ypos + CurY, 2*CurX);
    }
    if (D < 0)
    { 
      D += (CurX << 2) + 6;
    }
    else
    {
      D += ((CurX - CurY) << 2) + 10;
      CurY--;
    }
    CurX++;
  }

  BSP_LCD_SetTextColor(DrawProp.TextColor);
  BSP_LCD_DrawCircle(Xpos, Ypos, Radius);
}

/**
  * @brief  Draws a full ellipse.
  * @param  Xpos: X position
  * @param  Ypos: Y position
  * @param  XRadius: Ellipse X radius
  * @param  YRadius: Ellipse Y radius  
  * @retval None
  */
void BSP_LCD_FillEllipse(int Xpos, int Ypos, int XRadius, int YRadius)
{
  int x = 0, y = -YRadius, err = 2-2*XRadius, e2;
  float K = 0, rad1 = 0, rad2 = 0;
  
  rad1 = XRadius;
  rad2 = YRadius;
  
  K = (float)(rad2/rad1);    
  
  do 
  { 
    BSP_LCD_DrawHLine((Xpos-(uint16_t)(x/K)), (Ypos+y), (2*(uint16_t)(x/K) + 1));
    BSP_LCD_DrawHLine((Xpos-(uint16_t)(x/K)), (Ypos-y), (2*(uint16_t)(x/K) + 1));
    
    e2 = err;
    if (e2 <= x) 
    {
      err += ++x*2+1;
      if (-y == x && e2 <= y) e2 = 0;
    }
    if (e2 > y) err += ++y*2+1;
  }
  while (y <= 0);
}

/**
  * @brief  Enables the display.
  * @retval None
  */
void BSP_LCD_DisplayOn(void)
{
  lcd_drv->DisplayOn();
}

/**
  * @brief  Disables the display.
  * @retval None
  */
void BSP_LCD_DisplayOff(void)
{
  lcd_drv->DisplayOff();
}

/**
  * @}
  */

/** @addtogroup STM3210C_EVAL_LCD_Private_Functions
  * @{
  */ 

/******************************************************************************
                            Static Function
*******************************************************************************/
/**
  * @brief  Draws a pixel on LCD.
  * @param  Xpos: X position 
  * @param  Ypos: Y position
  * @param  RGBCode: Pixel color in RGB mode (5-6-5)  
  * @retval None
  */
static void LCD_DrawPixel(uint16_t Xpos, uint16_t Ypos, uint16_t RGBCode)
{
  if(lcd_drv->WritePixel != NULL)
  {
    lcd_drv->WritePixel(Xpos, Ypos, RGBCode);
  }
}

/**
  * @brief  Draws a character on LCD.
  * @param  Xpos: Line where to display the character shape
  * @param  Ypos: Start column address
  * @param  pChar: Pointer to the character data
  * @retval None
  */
static void LCD_DrawChar(uint16_t Xpos, uint16_t Ypos, const uint8_t *pChar)
{
  uint32_t counterh = 0, counterw = 0, index = 0;
  uint16_t height = 0, width = 0;
  uint8_t offset = 0;
  uint8_t *pchar = NULL;
  uint32_t line = 0;
  
 
  height = DrawProp.pFont->Height;
  width  = DrawProp.pFont->Width;
  
  /* Fill bitmap header*/
  *(uint16_t *) (bitmap + 2) = (uint16_t)(height*width*2+OFFSET_BITMAP);
  *(uint16_t *) (bitmap + 4) = (uint16_t)((height*width*2+OFFSET_BITMAP)>>16);
  *(uint16_t *) (bitmap + 10) = OFFSET_BITMAP;
  *(uint16_t *) (bitmap + 18) = (uint16_t)(width);
  *(uint16_t *) (bitmap + 20) = (uint16_t)((width)>>16);
  *(uint16_t *) (bitmap + 22) = (uint16_t)(height);
  *(uint16_t *) (bitmap + 24) = (uint16_t)((height)>>16);

  offset =  8 *((width + 7)/8) -  width ;
  
  for(counterh = 0; counterh < height; counterh++)
  {
    pchar = ((uint8_t *)pChar + (width + 7)/8 * counterh);
    
    if(((width + 7)/8) == 3)
    {
      line =  (pchar[0]<< 16) | (pchar[1]<< 8) | pchar[2];
    }

    if(((width + 7)/8) == 2)
    {
      line =  (pchar[0]<< 8) | pchar[1];
    }
      
    if(((width + 7)/8) == 1)
    {
      line =  pchar[0];
    }  
    
    for (counterw = 0; counterw < width; counterw++)
    {
      /* Image in the bitmap is written from the bottom to the top */
      /* Need to invert image in the bitmap */
      index = (((height-counterh-1)*width)+(counterw))*2+OFFSET_BITMAP;
      if(line & (1 << (width- counterw + offset- 1))) 
      {
        bitmap[index] = (uint8_t)DrawProp.TextColor;
        bitmap[index+1] = (uint8_t)(DrawProp.TextColor >> 8);
      }
      else
      {
        bitmap[index] = (uint8_t)DrawProp.BackColor;
        bitmap[index+1] = (uint8_t)(DrawProp.BackColor >> 8);
      } 
    }
  }

  BSP_LCD_DrawBitmap(Xpos, Ypos, bitmap);
}

/**
  * @brief  Sets display window.
  * @param  Xpos: LCD X position
  * @param  Ypos: LCD Y position
  * @param  Width: LCD window width
  * @param  Height: LCD window height  
  * @retval None
  */
static void LCD_SetDisplayWindow(uint16_t Xpos, uint16_t Ypos, uint16_t Width, uint16_t Height)
{
  if(lcd_drv->SetDisplayWindow != NULL)
  {
    lcd_drv->SetDisplayWindow(Xpos, Ypos, Width, Height);
  }  
}

/**
  * @}
  */  

/**
  * @}
  */  
  
/**
  * @}
  */ 
  
/**
  * @}
  */     

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