Tony Mudd
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
Diff: matrixDisplay.h
- Revision:
- 0:69eeea586a16
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/matrixDisplay.h Wed Jun 15 22:27:52 2011 +0000
@@ -0,0 +1,48 @@
+/*
+ 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
\ No newline at end of file