TextDisplay.h

00001  //  ST7735 8 Bit SPI Library
00002 
00003 #ifndef MBED_TEXTDISPLAY_H
00004 #define MBED_TEXTDISPLAY_H
00005 
00006 #include "mbed.h"
00007 
00008 class TextDisplay : public Stream {
00009 public:
00010 
00011   // functions needing implementation in derived implementation class
00012   /** Create a TextDisplay interface
00013      *
00014      * @param name The name used in the path to access the strean through the filesystem
00015      */
00016     TextDisplay(const char *name = NULL);
00017 
00018     /** output a character at the given position
00019      *
00020      * @param column column where charater must be written
00021      * @param  row where character must be written
00022      * @param c the character to be written to the TextDisplay
00023      */
00024     virtual void character(int column, int row, int c) = 0;
00025 
00026     /** return number if rows on TextDisplay
00027      * @result number of rows
00028      */
00029     virtual int rows() = 0;
00030 
00031     /** return number if columns on TextDisplay
00032     * @result number of rows
00033     */
00034     virtual int columns() = 0;
00035     
00036     // functions that come for free, but can be overwritten
00037 
00038     /** redirect output from a stream (stoud, sterr) to  display
00039     * @param stream stream that shall be redirected to the TextDisplay
00040     */
00041     virtual bool claim (FILE *stream);
00042 
00043     /** clear screen
00044     */
00045     virtual void cls();
00046     virtual void locate(int column, int row);
00047     virtual void foreground(uint16_t colour);
00048     virtual void background(uint16_t colour);
00049     // putc (from Stream)
00050     // printf (from Stream)
00051     
00052 protected:
00053 
00054     virtual int _putc(int value);
00055     virtual int _getc();
00056 
00057     // character location
00058     uint16_t _column;
00059     uint16_t _row;
00060 
00061     // colours
00062     uint16_t _foreground;
00063     uint16_t _background;
00064     char *_path;
00065 };
00066 
00067 #endif