Matrix driver for HDSP-200x four character 5x7 alphanumeric displays. These are 12 pin DIL package ICs full of LEDs arranged in 4 characters of 5 columns & 7 rows each. The ones I have are the yellow HDSP-2001, but they are also available in red (HDSP-2000), high efficiency red (HDSP-2002) or green (HDSP 2003). I don't know if they are easily available anymore, but I thought, since I've got 30 or so, I'd have a go at programming them. See my notepad (http://mbed.org/users/tonymudd/notebook/led-matrix-display/) for videos of this working.
Dependents: alpha_message TP1_matriz
matrixDisplay.h
- Committer:
- tonymudd
- Date:
- 2011-06-15
- Revision:
- 0:69eeea586a16
File content as of revision 0:69eeea586a16:
/* class to write to a matrix led display. Written by tonymudd (mbed@tonymudd.co.uk) */ #include "mbed.h" #ifndef MBED_MATRIXDISPLAY_H #define MBED_MATRIXDISPLAY_H class matrixDisplay { public: matrixDisplay( float scrollRate, PinName clockPinIn, PinName dataPinIn, PinName col1, PinName col2, PinName col3, PinName col4, PinName col5); virtual ~matrixDisplay(); void setMessage(char * newMessage); void stop(); private: void colChange(); void outputCol(int); void loadDisplay(); void scrollMessage(); static const int numOfColumns = 5; static const int numOfRows = 7; static const int numOfChars = 4; static const int numOfLeds = numOfRows * numOfChars; int column; // fires when the column changes - fast Ticker colTick; // fires to scroll the chars along one - slow. Ticker scroll; bool display[numOfColumns][numOfLeds]; // on the display now char text[numOfChars]; // text on the display char *message; // the whole message int whereInMessage; // which character in message to display next // And the hardware it uses: DigitalOut * clockPin; DigitalOut * dataPin; // DigitalOut data(p20); BusOut * columnsBus; // BusOut columns(p10,p11,p12,p13,p14); }; #endif