File content as of revision 15:516f15979b53:

///////////////////////////////////////////////////////////////////////////////
// LCD_ST7735 - Driver for ST7735 LCD display controller
// Author: Chris Taylor (taylorza)

#ifndef __LCD_ST7735__
#define __LCD_ST7735__
/** LCD_ST7735 is a simple driver for the ST7735 LCD controller. It provides basic drawing primitives sa well as text and font capabilities.
 * The driver is currently hardcoded to support 65K colors using a 565 RGB pixel format.
*/
class LCD_ST7735
{   
    public:
        /** Orientation of the display */
        enum Orientation 
        {
            /** No rotation of the display image*/
            Rotate0, 
            /** Rotate the display image 90 degrees */
            Rotate90, 
            /** Rotate the display image 180 degrees */
            Rotate180, 
            /** Rotate the display image 270 degrees */
            Rotate270
        };
        
        /** Type of color filter of the panel */
        enum PanelColorFilter
        {
            /** RGB color filter panel */
            RGB = 0,
            
            /** BGR color filter panel */
            BGR = 8,
        };
        
    public:
        /**Creates an instance of the LCD_ST7735 driver
         * @param backlightPin pin used to control the backlight
         * @param resetPin pin used to reset the display controller
         * @param dsPin pin used to put the display controller into data mode
         * @param mosiPin SPI channel MOSI pin
         * @param misoPin SPI channel MISO pin
         * @param clkPin SPI channel clock pin
         * @param csPin SPI chip select pin 
        */
        LCD_ST7735(
            PinName backlightPin,
            PinName resetPin,
            PinName dsPin,
            PinName mosiPin,
            PinName misoPin,
            PinName clkPin,
            PinName csPin,
            PanelColorFilter colorFilter = BGR
            );
            
        /** Set the orientation of the display
         * @param orientation Orientation of the display.
         * @param flip Flips the display direction
         */
        void setOrientation(Orientation orientation, bool flip);
        
        /** Get the width of the display given the current orientation */
        int getWidth();
        
        /** Get the height of the display given the current orientation */
        int getHeight();
    
        /** Control the display's backlight 
         * @param state true to turn the backlight on, false to turn it off   
        */
        void setBacklight(bool state);
        
        /** Clear the screen 
         * @param color The color used to clear the screen. Defaults to black if not passed.
        */
        void clearScreen(uint16_t color = 0x0000);
        
        /**  Set a pixel on the display to the specified color 
         * @param x The X coordinate of the pixel (0..127)   
         * @param y The Y coordinate of the pixel (0..159)   
         * @param color Color to set the pixel to.
        */
        void setPixel(int x, int y, uint16_t color);
        
        /** Draw a line on the display
         * @param x1 The X coordinate of the starting point on the line
         * @param y1 The Y coordinate of the starting point on the line
         * @param x2 The X coordinate of the end point on the line
         * @param y2 The Y coordinate of the end point on the line
         * @param color The color used to draw the pixel
        */
        void drawLine(int x1, int y1, int x2, int y2, uint16_t color);
        
        /** Draw a rectangle on the display 
         * @param x1 The X coordinate of the upper left corner
         * @param y1 The Y coordinate of the upper left corner
         * @param x2 The X coordinate of the lower right corner
         * @param y2 The Y coordinate of the lower right corner
         * @param color The color used to draw the rectangle
        */
        void drawRect(int x1, int y1, int x2, int y2, uint16_t color);
        
        /** Draw a circle on the display
         * @param x The X coordinate of the center of the circle
         * @param y The Y coordinate of the center of the circle
         * @param r The radius of the circle
         * @param color The color used to draw the circle
        */
        void drawCircle(int x, int y, int r, uint16_t color);
        
        /** Draw an ellipse on the display
         * @param x The X coordinate of the center of the ellipse
         * @param y The Y coordinate of the center of the ellipse
         * @param rx The X radius of the ellipse
         * @param ry The X radius of the ellipse
         * @param color The color used to draw the ellipse
        */
        void drawEllipse(int x, int y, int rx, int ry, uint16_t color);
        
        /** Draw a filled rectangle on the display 
         * @param x1 The X coordinate of the upper left corner
         * @param y1 The Y coordinate of the upper left corner
         * @param x2 The X coordinate of the lower right corner
         * @param y2 The Y coordinate of the lower right corner
         * @param fillColor The color used to fill the rectangle
        */
        void fillRect(int x1, int y1, int x2, int y2, uint16_t fillColor);
        
        /** Draw a filled rectangle on the display 
         * @param x1 The X coordinate of the upper left corner
         * @param y1 The Y coordinate of the upper left corner
         * @param x2 The X coordinate of the lower right corner
         * @param y2 The Y coordinate of the lower right corner
         * @param borderColor The color used to draw the rectangle frame
         * @param fillColor The color used to fill the rectangle
        */
        void fillRect(int x1, int y1, int x2, int y2, uint16_t borderColor, uint16_t fillColor);
        
        /** Draw a filled circle on the display
         * @param x The X coordinate of the center of the circle
         * @param y The Y coordinate of the center of the circle
         * @param borderColor The color used to draw the circumference of the circle
         * @param fillColor The color used to fill the circle
        */
        void fillCircle(int x, int y, int r, uint16_t borderColor, uint16_t fillColor);
        
        /** Draw a filled ellipse on the display
         * @param x The X coordinate of the center of the ellipse
         * @param y The Y coordinate of the center of the ellipse
         * @param rx The X radius of the ellipse
         * @param ry The X radius of the ellipse
         * @param borderColor The color used to draw the circumference of the circle
         * @param fillColor The color used to fill the circle
        */
        void fillEllipse(int x, int y, int rx, int ry, uint16_t borderColor, uint16_t fillColor);
        
        /** Draw a bitmap on the screen 
         * @param x The X coordinate location to draw the bitmap.
         * @param y The Y coordinate location to draw the bitmap.
         * @param pbmp Pointer to the bitmap.
         * @note The bitmap is an single dimensional uint8_t (unsigned short) array. 
         * The first to elements of the array indicate the width and height of the bitmap repectively.
         * The rest of the entries int the array make up the pixel data for the array.
        */
        void drawBitmap(int x, int y, const uint16_t *pbmp);
        
        /** Extracts a portion of a bitmap and draws it on the screen 
         * @param x The X coordinate location to draw the bitmap.
         * @param y The Y coordinate location to draw the bitmap.
         * @param pbmp Pointer to the bitmap.
         * @param srcX X offset into the source bitmap of the portion to extract
         * @param srcY Y offset into the source bitmap of the portion to extract
         * @param srcWidth Width of the bitmap portion to draw
         * @param srcHeight Height of the bitmap portion to draw
         * @note The bitmap is an single dimensional uint8_t (unsigned short) array. 
         * The first to elements of the array indicate the width and height of the bitmap repectively.
         * The rest of the entries int the array make up the pixel data for the array.
        */
        void drawBitmap(int x, int y, const uint16_t *pbmp, int srcX, int srcY, int srcWidth, int srcHeight);
        
        /** Set the foreground color used to render text
         * @param color Color used when drawing text to the display
         * @note The color can be changed multiple times to render text in various colors on the display
        */
        void setForegroundColor(uint16_t color);
        
        /** Set the background color used to render text
         * @param color Color used when drawing background portions of the text
         * @note The color can be changed multiple times to render text with various background colors on the display
        */
        void setBackgroundColor(uint16_t color);        
        
        /** Draw a string to the screen using the currently active foreground and background colors
         * @param pFont Pointer to the font used to render the string to the display
         * @param x The X coordinate location to draw the string.
         * @param y The Y coordinate location to draw the string.
         * @param pString ASCIIZ string to draw to the display.         
        */
        void drawString(const uint8_t *pFont, int x, int y, const char *pString);
        
        /** Measure the width and height of the string when rendered with the specified font
         * @param pFont Pointer to the font used to measure the string         
         * @param pString ASCIIZ string to measure.
         * @param width Reference to the variable that will contain the width
         * @param height Reference to the variable that will contain the height         
        */
        void measureString(const uint8_t *pFont, const char *pString, uint8_t &width, uint8_t &height);
        
        /** Select the device on the SPI bus.
        selectDevice needs to be called before accessing the screen if there are multiple devices on the SPI bus.
        */
        void selectDevice();   
        
    protected:
        void writeCommand(uint8_t cmd);
        void write(uint8_t cmd, uint8_t data[], int dataLen);
        void write(uint8_t cmd, uint16_t data);        
        
        void beginBatchCommand(uint8_t cmd);
        void writeBatchData(uint8_t data);
        void writeBatchData(uint8_t dataHigh, uint8_t dataLow);
        void writeBatchData(uint16_t data);
        void endBatchCommand();
        
        void clip(int x, int y, int w, int h);
        void clipRect(int x1, int y1, int x2, int y2);
        
    private:
        void drawVertLine(int x1, int y1, int y2, uint16_t color);
        void drawHorizLine(int x1, int y1, int x2, uint16_t color);
        void drawChar(const uint8_t *pFont, int x, int y, char c, uint8_t w, uint8_t h, uint8_t offset, uint8_t leftPad, uint8_t rightPad, uint8_t topPad, uint8_t bottomPad);
        
    private:
        void swap(int &a, int &b);
        
    private:
        void initDisplay();
        void reset();        
        
    private:
        int         _width;
        int         _height;
        Orientation _orientation;
        PanelColorFilter _colorFilter;
        bool        _flip; 
        uint8_t    _foregroundColorHigh;
        uint8_t    _foregroundColorLow;
        uint8_t    _backgroundColorHigh;
        uint8_t    _backgroundColorLow;
        
    private:
        class LCDSPI : public SPI
        {
            public:
                LCDSPI(PinName mosi, PinName miso, PinName sclk) :
                    SPI(mosi, miso, sclk)
                {
                }
                
                void prepareFastSPI()
                {
                    #ifdef TARGET_LPC11U24
                    aquire();
                    #endif
                }
                
                void waitWhileBusy()
                {
                    #ifdef TARGET_LPC11U24
                    while (((_spi.spi->SR) & 0x10) != 0);
                    #endif
                }
                
                void fastWrite(uint8_t data)
                {       
                    #ifdef TARGET_LPC11U24
                        while (((_spi.spi->SR) & 0x01) == 0);
                        _spi.spi->DR = data;
                    #else
                        SPI::write(data);
                    #endif 
                }       
                
                void clearRx()
                { 
                    #ifdef TARGET_LPC11U24
                        while (((_spi.spi->SR) & 0x14) != 0)
                        {
                            while (((_spi.spi->SR) & 0x04) == 0);
                            int data = _spi.spi->DR;
                        }                                         
                    #endif  
                }            
        };
        
    private:                
        DigitalOut  _backlight;
        DigitalOut  _reset;
        DigitalOut  _ds;
        DigitalOut  _cs;
        LCDSPI      _spi;
        
    protected:
        static const uint8_t CMD_SLPOUT     = 0x11;
        static const uint8_t CMD_DISPON     = 0x29;
        static const uint8_t CMD_CASET      = 0x2a;
        static const uint8_t CMD_RASET      = 0x2b;
        static const uint8_t CMD_RAMWR      = 0x2c;
        
        static const uint8_t CMD_MADCTL     = 0x36;
        static const uint8_t CMD_COLMOD     = 0x3a;
        
        static const uint8_t CMD_FRMCTR1    = 0xb1;
        static const uint8_t CMD_FRMCTR2    = 0xb2;
        static const uint8_t CMD_FRMCTR3    = 0xb3;
        static const uint8_t CMD_INVCTR     = 0xb4;
        
        static const uint8_t CMD_PWCTR1     = 0xc0;
        static const uint8_t CMD_PWCTR2     = 0xc1;
        static const uint8_t CMD_PWCTR3     = 0xc2;
        static const uint8_t CMD_PWCTR4     = 0xc3;
        static const uint8_t CMD_PWCTR5     = 0xc4;
        static const uint8_t CMD_VMCTR1     = 0xc5;
        
        static const uint8_t CMD_GAMCTRP1   = 0xe0;
        static const uint8_t CMD_GAMCTRN1   = 0xe1;
        
        static const uint8_t CMD_EXTCTRL    = 0xf0;                
};

#endif // __LCD_ST7735__