matrixDisplay.h

00001 /*
00002     class to write to a matrix led display.
00003     
00004     Written by tonymudd (mbed@tonymudd.co.uk)
00005     
00006 */
00007 #include "mbed.h"
00008 
00009 #ifndef MBED_MATRIXDISPLAY_H
00010 #define MBED_MATRIXDISPLAY_H
00011 
00012 class matrixDisplay
00013 {
00014     public:
00015     matrixDisplay(  float scrollRate,   PinName clockPinIn, PinName dataPinIn,
00016                     PinName col1,       PinName col2,       PinName col3,
00017                     PinName col4,       PinName col5);
00018     virtual ~matrixDisplay();
00019     void setMessage(char * newMessage);
00020     void stop();
00021 
00022     private:
00023     void colChange();
00024     void outputCol(int);
00025     void loadDisplay();
00026     void scrollMessage();
00027     static const int numOfColumns = 5;
00028     static const int numOfRows = 7;
00029     static const int numOfChars = 4;
00030     static const int numOfLeds = numOfRows * numOfChars;
00031     int column;
00032     // fires when the column changes - fast
00033     Ticker colTick;
00034     // fires to scroll the chars along one - slow.
00035     Ticker scroll;
00036     bool display[numOfColumns][numOfLeds];  // on the display now
00037     char text[numOfChars];                  // text on the display
00038     char *message;                          // the whole message
00039     int whereInMessage;                     // which character in message to display next
00040     
00041     // And the hardware it uses:  
00042     DigitalOut  * clockPin;
00043     DigitalOut  * dataPin;      //    DigitalOut data(p20);
00044     BusOut      * columnsBus;   //  BusOut columns(p10,p11,p12,p13,p14);
00045     
00046 };
00047 
00048 #endif