This is a port of Henning Kralsen's UTFT library for Arduino/chipKIT to mbed, refactored to make full use of C++ inheritance and access control, in order to reduce work when implementing new drivers and at the same time make the code more readable and easier to maintain. As of now supported are SSD1289 (16-bit interface), HX8340-B (serial interface) and ST7735 (serial interface). Drivers for other controllers will be added as time and resources to acquire the displays to test the code permit.

# TFTLCD Library

NOTE (2013-03-25) Tested with both mbed LPC1768 and Freedom KL25Z. -todor

A TFT LCD driver library, which at the moment provides support for the following display controllers: HX8340-B (serial interface), SSD1289 (16-bit interface), ST7735-R (serial interface), ILI9325/ILI9328 (16-bit interface).

As I am acquiring and testing out new displays, I decided to combine all ported drivers into one library as with the original work done by Henning. However I also had as a goal to make the code maintenance and readability easier/better, so the code has been heavily refactored to make full use of C++ facilities as inheritance and access control. I extracted the common pieces of code into a base class, which every driver inherits and only the controller-specific side is provided in the actual driver - things like initialization, addressing, data transfer, etc.

Another nice extension is that the display's backlight can now be controlled through the driver. Either a simple on/off method of control could be selected, or the brightness can be set through use of PWM (the latter placing some restrictions on which pins can be used for this, as mbed offers hardware PWM on only 6 pins).

I also plan to add support for touch screens as part of the library. The goal is to grow this piece of software into a lightweight graphics widgets library, which can be used to construct control screens with buttons or menus in a speedy and intuitive way.

## Changes

### 2013-07-21

• Fixed the sleep/wake-up functions of the ILI9328 driver.

### 2013-06-15

• Added driver for ILI9328 (works with ILI9325) controller, 16-bit data bus. Screen rotation works as usual with the TFTLCD library, but for now only RGB565 color depth is working and you can use both 65K and 262K color space with this driver. But for some reason the sleep function is not behaving as expected; I am working on this.
• This is only on my to-do list for now - haven't really had the time yet - but I am going to refactor the library a bit to allow use of GPIO ports for data transfers instead of DigitalOut: faster and cleaner that way. For those who are using it already in a working design and cannot repurpose the pins anymore, the current way it's working will still be available; I am hoping not to tear up the public interfaces of the library (... too much). Anyway, since I am at it, I will also try to add support for multiple bus interfaces to drivers that support it (i.e. both 8bit and 16bit use of ILI932x or SSD1289). Thought this might be a good place to give you guys the heads-up.

### 2013-01-25

• Added PWM backlight control. If you intend to use this, please make sure that control pin is either one of p21, p22, p23, p24, p25, or p26, as only they support hardware PWM. Please be aware that the mbed pins do not have much juice behind them, so if your display's backlight requires a lot of current, you are better off interfacing through as small signal transistor or a MOSFET. For the rest please consult the updated Doxygen documentation. NOTE The addition of PWM-controlled backlight will not break your existing code, the new options have default values, which initialize the used driver to behave as prior to PWM. Only if you want to use the new feature, some changes need to be made. The PWM is configured to be 120Hz (period of 8.33 milliseconds), in order to avoid noticeable flicker in the backlight. If in your opinion this value is too fine, then you can reduce the frequency in the LCD constructor in <lcd_base.cpp> by increasing the period value. My recommendation is to avoid frequencies lower than 60Hz.

### 2012-12-21

• Internal-only changes in the way drivers transmit colors - done to simplify the bitmap drawing routines; client API remains unchanged.

### 2012-12-12

• Added the driver for the ST7735 display controller.
• Added the RGB18 color mode: choose between 16-bit (65K distinct colors) and 18-bit (262K distinct colors) color space [supported by all drivers]. NOTE This feature requires the image drawing functions to be changed, in order to account for differences between configured display color depth and the color depth of the image. Please review the API docs, in particular the new type bitmap_t and the DrawBitmap functions.
• Changed display rotation to be achieved through the correspondent settings in the respective controller registers: no more software translation between width and height in different display orientations.
• Extended the orientation options: PORTRAIT (top line to 12 o'clock/upright) and LANDSCAPE (top line to 9 o'clock) positions are the old options, PORTRAIT_REV (top line to 6 o'clock/upside-down) and LANDSCAPE_REV (top line to 3 o'clock) are the new orientations.
• Added more pre-defined colors: available now are COLOR_BLACK, COLOR_WHITE, COLOR_RED, COLOR_GREEN, COLOR_BLUE, COLOR_CYAN, COLOR_MAGENTA and COLOR_YELLOW.

### TODO

• Finish implementing PWM-controlled backlight (current-sink configuration).
• Add a driver for the HX8352-A controller (ITDB02-3.2WD 16:9 240x400 pixel resolution display).

## How to Use

The code is documented, so please review the API docs. There is a simple example to get you started...

## lcd_base.h

Committer:
ttodorov
Date:
2013-07-22
Revision:
27:26491d710e72
Parent:
22:4c169297f374

### File content as of revision 27:26491d710e72:

/** \file lcd_base.h
*  \brief Base class for all LCD controller implementations.
*
* Generic object painting and screen control.
*
* This library is based on the Arduino/chipKIT UTFT library by Henning
* Karlsen, http://henningkarlsen.com/electronics/library.php?id=52
*
* Copyright (C)2010-2012 Henning Karlsen. All right reserved.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to:
*
* Free Software Foundation, Inc.
* 51 Franklin St, 5th Floor, Boston, MA 02110-1301, USA
*
*********************************************************************/
#ifndef TFTLCD_BASE_H
#define TFTLCD_BASE_H

#include "mbed.h"
#include "terminus.h"

#ifdef __cplusplus
extern "C" {
#endif

/** \def RGB(r,g,b)
*  \brief Creates a RGB color from distinct bytes for the red, green and blue components.
*
* Displays which use 16 bits to assign colors to a specific pixel, use
* 5 bits for the red component, 6 bits for the green component and 5
* bits for the blue component.  Displays which have 18-bit color depth
* use 6 bits for red, 6 bits for green and 6 bits for blue component.
* This macro preserves the full 24-bit color depth, but it is the responsibility
* of the respective driver to convert the color value to the correct format.
*/
#define RGB( r, g, b )          ( ( r ) << 16 ) | ( ( g ) << 8 ) | ( b )
/** \def COLOR_BLACK
*  \brief Shorthand for RGB( 0, 0, 0 ).
*/
#define COLOR_BLACK             RGB( 0x00, 0x00, 0x00 )
/** \def COLOR_WHITE
*  \brief Shorthand for RGB( 255, 255, 255 ).
*/
#define COLOR_WHITE             RGB( 0xFF, 0xFF, 0xFF )
/** \def COLOR_RED
*  \brief Shorthand for RGB( 255, 0, 0 ).
*/
#define COLOR_RED               RGB( 0xFF, 0x00, 0x00 )
/** \def COLOR_GREEN
*  \brief Shorthand for RGB( 0, 255, 0 ).
*/
#define COLOR_GREEN             RGB( 0x00, 0xFF, 0x00 )
/** \def COLOR_BLUE
*  \brief Shorthand for RGB( 0, 0, 255 ).
*/
#define COLOR_BLUE              RGB( 0x00, 0x00, 0xFF )
/** \def COLOR_CYAN
*  \brief Shorthand for RGB( 0, 255, 255 )
*/
#define COLOR_CYAN              RGB( 0x00, 0xFF, 0xFF )
/** \def COLOR_MAGENTA
*  \brief Shorthand for RGB( 255, 0, 255 )
*/
#define COLOR_MAGENTA           RGB( 0xFF, 0x00, 0xFF )
/** \def COLOR_YELLOW
*  \brief Shorthand for RGB( 255, 255, 0 )
*/
#define COLOR_YELLOW            RGB( 0xFF, 0xFF, 0x00 )

/** \enum Orientation_enum
*  \brief Display orientation.
*/
enum Orientation_enum
{
PORTRAIT = 0, /**< Top row of the screen is at 12 o'clock. */
LANDSCAPE = 1, /**< Top row of the screen is at 9 o'clock. */
PORTRAIT_REV = 2, /**< Top row of the screen is at 6 o'clock. */
LANDSCAPE_REV = 3, /**< Top row of the screen is at 3 o'clock. */
};
/** \typedef orientation_t
*  \brief Convenience shortcut for display orientation.
*/
typedef enum Orientation_enum orientation_t;

/** \enum ColorDepth_enum
*  \brief Color depth
*/
enum ColorDepth_enum
{
RGB16, /**< 16-bit colors, pixels can have 65K+ distinct color values */
RGB18, /**< 18-bit colors, pixels can have 262K+ distinct color values */
RGB24, /**< 24-bit colors, full 8 bits per component, 16M+ distinct color values */
};
/** \typedef colordepth_t
*  \brief Convenience shortcut for display color depth.
*/
typedef enum ColorDepth_enum colordepth_t;

/** \enum Alignment_enum
*  \brief Horizontal text alignment on the line.
*/
enum Alignment_enum
{
LEFT = 0, /**< Left-oriented, naturally gravitate closer to the left edge of the screen. */
CENTER = 9998, /**< Center-oriented, try to fit in the middle of the available space with equal free space to the left and right of the text. */
RIGHT = 9999, /**< Right-oriented, naturally gravitate closer to the right edge of the screen, leaving any remaining free space to the left of the text. */
};
/** \typedef align_t
*  \brief Convenience shortcut for text alignment.
*/
typedef enum Alignment_enum align_t;

///** \struct Font_struct
// *  \brief Describes fonts and their properties.
// *  \sa Comments in fonts.h
// */
//struct Font_struct
//{
//    const    char* font; /**< A pointer to the first byte in the font. */
//    unsigned char  width; /**< The width of each character, in pixels. */
//    unsigned char  height; /**< Height of each character, in pixels. */
//    unsigned char  offset; /**< Offset of the first character in the font. */
//    unsigned char  numchars; /**< Count of the available characters in the font. */
//};
///** \typedef font_metrics_t
// *  \brief Convenience shortcut for fonts properties.
// */
//typedef struct Font_struct font_metrics_t;

/** \struct Bitmap_struct
*  \brief Describes an image.
*/
struct Bitmap_struct
{
colordepth_t Format; /**< Color depth of the image. */
unsigned short Width; /**< Width of the image in pixels. */
unsigned short Height; /**< Height of the image in pixels. */
const void* PixelData; /**< Image pixel data. */
};
/** \typedef bitmap_t
*  \brief Convenience shortcut bitmap type.
*/
typedef struct Bitmap_struct bitmap_t;

/** \struct BacklightPwmCtrl_enum
*  \brief Type of backlight control for the LCD.
*
* When the selected type is \c Constant, the pin is simply on or off - there is no gradation in the intensity of the display.
* In this case any free pin can be used to control the backlight.  On the other hand, when PWM is used to control brightness,
* take care to use only PWM-able mbed pins (p21, p22, p23, p24, p25, and p26), any other pins won't work.  It is assumed that
* you know what you are doing, so no check is done to prevent using a non-PWM pin as assigned control pin, when either \c Direct
* or \c Indirect option is used.
*
* \version 0.1
* \remark When choosing PWM to control the backlight, you have the option to choose the pin to either source (\c Direct) or sink
*         (\c Indirect) the current for LCD brightness control.  Be aware that the mbed pins can source (and probably sink when
*         configured as inputs) only 4 mA @+3V3 VDD.  So if you are intending to use a bigger LCD, whith more LEDs in its backlight
*         implementation, you probably want to interface it through a small signal transistor or a small MOSFET, in order to be able
*         to handle a higher current without damaging your mbed.
* \remark As of version 0.1 (2013-01-25) the Indirect method of PWM has not been implemented yet.
*/
enum BacklightPwmCtrl_enum
{
Constant, /**< When the pin is a simple on/off switch. */
Direct, /**< Control the brightness with PWM, as the control pin is sourcing the current to drive the backlight LEDs. */
Indirect, /**< Control the brightness with PWM, as the control pin is sinking the current which drives the backlight LEDs. */
};
/** \typedef backlight_t
*  \brief Convenience shortcut for the backlight control type.
*/
typedef BacklightPwmCtrl_enum backlight_t;

/** Base class for LCD implementations.
*
* All separate LCD controller implementations have to subclass this one.
*
* \version 0.1
* \author Todor Todorov
*/
class LCD
{
public:

/** Initialize display.
*
* Wakes up the display from sleep, initializes power parameters.
* This function must be called first, befor any painting on the
* display is done, otherwise the positioning of graphical elements
* will not work properly and any paynt operation will not be visible
* or produce garbage.
*
* This function is controller-specific and needs to be implemented
* separately for each available display.
* \param oritentation The display orientation, landscape is default.
* \param colors The correct color depth to use for the pixel data.
*/
virtual void Initialize( orientation_t orientation, colordepth_t colors ) = 0;

/** Puts the display to sleep.
*
* When the display is in sleep mode, its power consumption is
* minimized.  Before new pixel data can be written to the display
* memory, the controller needs to be brought out of sleep mode.
* \sa #WakeUp( void );
* \remarks The result of this operation might not be exactly as
*          expected. Putting the display to sleep will cause the
*          controller to switch to the standard color of the LCD,
*          so depending on whether the display is normally white,
*          or normally dark, the screen might or might not go
*          dark.  Additional power saving can be achieved, if
*          the backlight of the used display is not hardwired on
*          the PCB and can be controlled via the BL pin.
* \remarks This function is controller-specific and needs to be
*          implemented separately for each available display.
*/
virtual void Sleep( void );

/** Wakes up the display from sleep mode.
*
* This function needs to be called before any other, when the
* display has been put into sleep mode by a previois call to
* #Sleep( void ).
* \remarks This function is controller-specific and needs to be
*          implemented separately for each available display.
*/
virtual void WakeUp( void );

/** Set the foreground color for painting.
*
* This is the default foreground color to be used in painting operations.
* If a specific output function allows for a different color to be specified
* in place, the new setting will be used for that single operation only and
* will not change this value.
*
* \param color The color to be used (24-bit color depth).
* \sa #RGB(r,g,b)
*/
virtual void SetForeground( unsigned int color = COLOR_WHITE );

/** Set the background color for painting.
*
* This is the default color to be used for "empty" pixels while painting.
* If a particular function allows for a different value to be specified
* when the function is called, the new value will be used only for this
* single call and will not change this setting.
*
* \param color The background color (24-bit color depth).
* \sa #RGB(r,g,b)
*/
virtual void SetBackground( unsigned int color = COLOR_BLACK );

/** Sets the font to be used for painting of text on the screen.
* \param font A pointer to the font data.
* \sa Comments in file fonts.h
*/
virtual void SetFont( const font_t* font );

/** Gets the display width.
*  \return Display width in pixels.
*/
unsigned short GetWidth( void );

/** Gets the display height.
*  \return Display height in pixels.
*/
unsigned short GetHeight( void );

/** Gets the font width.
*  \return The current font width.
*/
uint8_t GetFontWidth( void );

/** Gets the font height.
*  \return The current font height.
*/
uint8_t GetFontHeight( void );

/** Fills the whole screen with a single color.
* \param color The color to be used. The value must be in RGB-565 format.
* \remarks The special values -1 and -2 signify the preset background and foreground colors, respectively.
*          The backround color is the default.
*/
virtual void FillScreen( int color = -1 );

/** Sets the backlight intensity in percent as a float value in the range [0.0,1.0].
*  \param level The backligh intensity in percent, where 0.0 is off and 1.0 is full brightness.
*/
virtual void SetBacklightLevel( float level );

/** Clears the screen.
*
* This is the same as calling #FillScreen() or #FillScreen( -1 ) to use the background color.
*/
virtual void ClearScreen( void );

/** Draws a pixel at the specified location.
*
* By default the function will use the preset foreground color, but the background
* or a custom color could be used as well.
*
* \param x The horizontal offset of the pixel from the upper left corner of the screen.
* \param y The vertical offset of the pixel from the upper left corner of the screen.
* \param color The color to be used. Use a custom color, or -1 for background and -2 for foreground color.
*/
virtual void DrawPixel( unsigned short x, unsigned short y, int color = -2 );

/** Draws a line.
*
* \param x1 Horizontal offset of the beginning point of the line.
* \param y1 Vertical offset of the beginning point of the line.
* \param x2 Horizontal offset of the end point of the line.
* \param y2 Verical offset of the end point of the line.
* \param color The color to use for painting, or -1 for background, or -2 for foreground.
*/
virtual void DrawLine( unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2, int color = -2 );

/** Paints a rectangle.
*
* \param x1 The horizontal offset of the beginning point of one of the rectangle's diagonals.
* \param y1 The vertical offset of the beginning point of one of the rectangle's diagonals.
* \param x2 The horizontal offset of the end point of the same of the rectangle's diagonals.
* \param y2 The vertical offset of the end point of the same of the rectangle's diagonals.
* \param color The color to use for painting. -1 indicated background, -2 foreground, or custom color.
*/
virtual void DrawRect( unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2, int color = -2 );

/** Paints a rectangle and fills it with the paint color.
*
* \param x1 The horizontal offset of the beginning point of one of the rectangle's diagonals.
* \param y1 The vertical offset of the beginning point of one of the rectangle's diagonals.
* \param x2 The horizontal offset of the end point of the same of the rectangle's diagonals.
* \param y2 The vertical offset of the end point of the same of the rectangle's diagonals.
* \param color The color to use for painting. -1 indicated background, -2 foreground, or custom color.
*/
virtual void DrawRoundRect( unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2, int color = -2 );

/** Paints a rectangle with rounded corners.
*
* \param x1 The horizontal offset of the beginning point of one of the rectangle's diagonals.
* \param y1 The vertical offset of the beginning point of one of the rectangle's diagonals.
* \param x2 The horizontal offset of the end point of the same of the rectangle's diagonals.
* \param y2 The vertical offset of the end point of the same of the rectangle's diagonals.
* \param color The color to use for painting. -1 indicated background, -2 foreground, or custom color.
*/
virtual void FillRect( unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2, int color = -2 );

/** Paints a rectangle with rounded corners and fills it with the paint color.
*
* \param x1 The horizontal offset of the beginning point of one of the rectangle's diagonals.
* \param y1 The vertical offset of the beginning point of one of the rectangle's diagonals.
* \param x2 The horizontal offset of the end point of the same of the rectangle's diagonals.
* \param y2 The vertical offset of the end point of the same of the rectangle's diagonals.
* \param color The color to use for painting. -1 indicated background, -2 foreground, or custom color.
*/
virtual void FillRoundRect( unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2, int color = -2 );

/** Paints a circle.
*
* \param x The offset of the circle's center from the left edge of the screen.
* \param y The offset of the circle's center from the top edge of the screen.
* \param color The color to use for painting. -1 indicated background, -2 foreground, or custom color.
*/
virtual void DrawCircle( unsigned short x, unsigned short y, unsigned short radius, int color = -2 );

/** Paints a circle and fills it with the paint color.
*
* \param x The offset of the circle's center from the left edge of the screen.
* \param y The offset of the circle's center from the top edge of the screen.
* \param color The color to use for painting. -1 indicated background, -2 foreground, or custom color.
*/
virtual void FillCircle( unsigned short x, unsigned short y, unsigned short radius, int color = -2 );

/** Print a text on the screen.
*
* \param str The text.
* \param x The horizontal offset form the left edge of the screen. The special values LEFT, CENTER,
*          or RIGHT can be used instead of pixel offset to indicate the text's horizontal alignment.
* \param y The vertical offset of the text from the top of the screen.
* \param fgColor The foreground to use for painting the text; -1 indicates background color, -2 the foreground setting, or custom color.
* \param bgColor The color to use for painting the empty pixels; -1 indicates the background color, -2 the foreground setting, or custom color.
* \param deg If different than 0, the text will be rotated at an angle this many degrees around its starting point. Default is not to ratate.
*/
virtual void Print( const char *str, unsigned short x, unsigned short y, int fgColor = -2, int bgColor = -1, unsigned short deg = 0 );

/** Draw an image on the screen.
*
* The pixels of the picture must be in the RGB-565 format.  The data can be provided
* as an array in a source or a header file.  To convert an image file to the appropriate
* format, a special utility must be utilized.  One such tool is provided by Henning Karlsen,
* http://henningkarlsen.com/electronics/library.php?id=52
*
* \param x Horizontal offset of the first pixel of the image.
* \param y Vertical offset of the first pixel of the image.
* \param img Image data pointer.
* \param scale A value of 1 will produce an image with its original size, while a different value will scale the image.
*/
virtual void DrawBitmap( unsigned short x, unsigned short y, const bitmap_t* img, unsigned char scale = 1 );

/** Draw an image on the screen.
*
* The pixels of the picture must be in the RGB-565 format.  The data can be provided
* as an array in a source or a header file.  To convert an image file to the appropriate
* format, a special utility must be utilized.  One such tool is provided by Henning Karlsen,
* http://henningkarlsen.com/electronics/library.php?id=52
*
* \param x Horizontal offset of the first pixel of the image.
* \param y Vertical offset of the first pixel of the image.
* \param img Image data pointer.
* \param deg Angle to rotate the image before painting on screen, in degrees.
* \param rox
* \param roy
*/
virtual void DrawBitmap( unsigned short x, unsigned short y, const bitmap_t* img, unsigned short deg, unsigned short rox, unsigned short roy );

protected:
/** Creates an instance of the class.
*
* \param width Width of the display in pixels.
* \param height Height of the display in pixels.
* \param CS Pin connected to the CS input of the display.
* \param RS Pin connected to the RS input of the display.
* \param RESET Pin connected to the RESET input of the display.
* \param BL Pin connected to the circuit controlling the LCD's backlight.
* \param blType The type of backlight to be used.
* \param defaultBacklight The standard backlight intensity (if using PWM control), expressed in percent as float value from 0.0 to 1.0
*/
LCD( unsigned short width, unsigned short height ,PinName CS, PinName RS, PinName RESET, PinName BL, backlight_t blType, float defaultBacklight );

/** Activates the display for command/data transfer.
*
* Usually achieved by pulling the CS pin of the display low.
*/
virtual void Activate( void );

/** Deactivates the display after data has been transmitted.
*
* Usually achieved by pulling the CS pin of the display high.
*/
virtual void Deactivate( void );

/** Sends a command to the display.
*
* \param cmd The display command.
* \remarks Commands are controller-specific and this function needs to
*          be implemented separately for each available controller.
*/
virtual void WriteCmd( unsigned short cmd ) = 0;

/** Sends pixel data to the display.
*
* \param data The display data.
* \remarks Sendin data is controller-specific and this function needs to
*          be implemented separately for each available controller.
*/
virtual void WriteData( unsigned short data ) = 0;

/** Sends both command and data to the display controller.
*
* This is a helper utility function which combines the 2 functions above
* into one single convenience step.
*
* \param cmd The display command.
* \param data The display pixel data.
*/
virtual void WriteCmdData( unsigned short cmd, unsigned short data );

/** Assigns a chunk of the display memory to receive data.
*
* When data is sent to the display after this function completes, the opertion will
* start from the begining of the assigned address (pixel position) and the pointer
* will be automatically incremented so that the next data write operation will continue
* with the next pixel from the memory block.  If more data is written than available
* pixels, at the end of the block the pointer will jump back to its beginning and
* commence again, until the next address change command is sent to the display.
*
* \param x1 The X coordinate of the pixel at the beginning of the block.
* \param y1 The Y coordinate of the pixel at the beginning of the block.
* \param x2 The X coordinate of the pixel at the end of the block.
* \param y2 The Y coordinate of the pixel at the end of the block.
* \remarks Addressing commands are controller-specific and this function needs to be
*          implemented separately for each available controller.
*/
virtual void SetXY( unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2 ) = 0;

/** Resets the memory address for the next display write operation to the screen origins (0,0).
*/
virtual void ClearXY( void );

/** Sets the color of the pixel at the address pointer of the controller.
*
* This function is to be provided by each implementation separately in
* order to account for different color depths used by the controller.
* \param color The color of the pixel.
* \param mode The depth (palette) of the color.
*/
virtual void SetPixelColor( unsigned int color, colordepth_t mode = RGB24 ) = 0;

/** Draws a horizontal line.
*
* This is a utility function to draw horizontal-only lines
* for reduced code complexity and faster execution.
*
* \param x X coordinate of the starting point of the line.
* \param y Y coordinate of the starting point of the line.
* \param len Length of the line.
* \param color The color to use to draw the line. By default the global foreground color is used ( -2 ),
*              -1 switches to the default background color, or any custom color can be used.
*/
virtual void DrawHLine( unsigned short x, unsigned short y, unsigned short len, int color = -2 );

/** Draws a vertical line.
*
* This is a utility function to draw vertical-only lines
* for reduced code complexity and faster execution.
*
* \param x X coordinate of the starting point of the line.
* \param y Y coordinate of the starting point of the line.
* \param len Height of the line.
* \param color The color to use to draw the line. By default the global foreground color is used ( -2 ),
*              -1 switches to the default background color, or any custom color can be used.
*/
virtual void DrawVLine( unsigned short x, unsigned short y, unsigned short len, int color = -2 );

/** Prints a character at the given position and using the given color.
*
* \param c The character.
* \param x X coordinate of the character position.
* \param y Y coordinate of the character position.
* \param fgColor Foreground color for drawing. By default the global foreground color is used ( -2 ),
*                -1 switches to the default background color, or any custom color can be used.
* \param bgColor Background color for drawing. By default the global background color is used ( -1 ),
*                -2 switches to the default foreground color, or any custom color can be used.
*/
virtual void PrintChar( char c, unsigned short x, unsigned short y, int fgColor = -2, int bgColor = -1 );

/** Prints a character at the given position and using the given color and with the given rotation.
*
* \param c The character.
* \param x X coordinate of the character position.
* \param y Y coordinate of the character position.
* \param pos Position of the character in the string from which it originates (used to rotate a whole string).
* \param fgColor Foreground color for drawing. By default the global foreground color is used ( -2 ),
*                -1 switches to the default background color, or any custom color can be used.
* \param bgColor Background color for drawing. By default the global background color is used ( -1 ),
*                -2 switches to the default foreground color, or any custom color can be used.
* \param deg The angle at which to rotate.
*/
virtual void RotateChar( char c, unsigned short x, unsigned short y, int pos, int fgColor = -2, int bgColor = -1, unsigned short deg = 0 );

protected:
unsigned short  _disp_width, _disp_height;
DigitalOut      _lcd_pin_cs, _lcd_pin_rs, _lcd_pin_reset;
orientation_t   _orientation;
colordepth_t    _colorDepth;
unsigned int    _foreground, _background;
const font_t*   _font;
DigitalOut*     _lcd_pin_bl;
PwmOut*         _bl_pwm;
backlight_t     _bl_type;
float           _bl_pwm_default, _bl_pwm_current;
};

#ifdef __cplusplus
}
#endif

#endif /* TFTLCD_BASE_H */