Diff: matrixDisplay.cpp

Revision:

0:69eeea586a16

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/matrixDisplay.cpp	Wed Jun 15 22:27:52 2011 +0000
@@ -0,0 +1,102 @@
+#include "mbed.h"
+#include "matrixDisplay.h"
+#include "matrix.h"
+#include <string>
+
+matrixDisplay::matrixDisplay(   float scrollRate,   PinName clockPinIn,
+                                PinName dataPinIn,  PinName col1,
+                                PinName col2,       PinName col3,
+                                PinName col4,       PinName col5)
+{
+    clockPin = new DigitalOut(clockPinIn);
+    dataPin = new DigitalOut(dataPinIn);
+    columnsBus = new BusOut(col1, col2, col3, col4, col5);
+    column = 0;
+    whereInMessage = 0;
+    message = NULL;
+    // clear the text array.
+    for (int i =0 ; i < numOfChars; i++)
+        text[i] = ' ';
+    loadDisplay();
+    colTick.attach_us(this, &matrixDisplay::colChange, 5000);
+    scroll.attach(this, &matrixDisplay::scrollMessage, scrollRate);
+}
+
+matrixDisplay::~matrixDisplay()
+{
+    stop();
+}
+
+// Stop displaying stuff.
+void matrixDisplay::stop()
+{
+    colTick.detach();
+    scroll.detach();
+    columnsBus->write( 0);
+}
+
+// load a new message
+// keeps a pointer to it, so bad things could happen.
+void matrixDisplay::setMessage(char * newMessage)
+{
+    for (int i =0 ; i < numOfChars; i++)
+        text[i] = ' ';
+    message = newMessage;
+    whereInMessage = 0;
+}
+
+void matrixDisplay::outputCol(int colNum)  // colNum is 0-4
+{
+    for (int i = 0; i< numOfLeds; i++)  // once for each bool in the "display" which has already been set up
+    {
+        clockPin->write(1);
+        if (display[colNum][i])
+            dataPin->write(1);
+        else
+            dataPin->write(0);
+        clockPin->write(0);
+    }
+}
+
+void matrixDisplay::colChange()
+{
+    columnsBus->write( 0);
+    column ++;
+    if (column > 4)
+        column = 0;
+    outputCol(column);
+    columnsBus->write (1 << column); // columns is a bit pattern
+}
+
+// turns the contents of "text" into the bit pattern in "display"
+void matrixDisplay::loadDisplay()
+{
+    for (int i =0;i < numOfChars; i ++)   // for each char in text
+    {
+        char c = text[i];
+        c -= 32;    // index an array starting at 0 for char ' ' (space)
+        for (int led = 0; led < numOfRows; led++)   // for each led in the column, done this way round because that's the way it's stored in matrix.h
+        {
+            int bits = char_data[c][led];
+            for (int col = 0; col < numOfColumns; col++)   // for each column
+            {
+                display[col][led+i*numOfRows] = (bits & 1<< col);
+            }    
+        }        
+    }
+}
+
+void matrixDisplay::scrollMessage()
+{
+    if (message == NULL)    // It may not have been set yet.
+        return;
+    if (whereInMessage >= strlen(message))
+        whereInMessage =0;
+    for (int i=1;i<numOfChars;i++)
+    {
+        text[i-1] = text[i];
+    }
+    text[numOfChars-1] = message[whereInMessage];
+    loadDisplay();
+    whereInMessage ++;
+}