Diff: main.cpp

Revision:

0:ac9e3a1bbc8f

Child:

2:aaa5b046e49d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 28 10:51:30 2014 +0000
@@ -0,0 +1,64 @@
+/**
+ *  A hello world code for the PCA9622 LED 8x8 library
+ *
+ *  @author  Tedd OKANO
+ *  @version 1.0
+ *  @date    28-Nov-2014
+ *
+ *  This is a very simple sample code for the PCA9622_LED8x8 library. 
+ *  Target hardware : "I2C 8x8 LED matrix board" from Switch Science
+ *    https://www.switch-science.com/catalog/2071/
+ *
+ *  The I2C LED controller PCA9622 is used on this module 
+ *  that ebables to control the LEDs with PWM brightness control. 
+ *  
+ *  For more information about the PCA9622:
+ *    http://www.nxp.com/documents/data_sheet/PCA9622.pdf
+ */
+
+#include "mbed.h"
+#include "PCA9622_LED8x8.h"
+
+//  Choose a target platform from next list
+PCA9622_LED8x8  matrix( p28, p27 );     //  for 40pin type mbed
+//PCA9622_LED8x8  matrix( D14, D15 );   //  for Arduino type mbed
+//PCA9622_LED8x8  matrix( dp5, dp27 );  //  for mbed LPC1114
+
+float func( float x, float y, float t );    //  function to make 8x8 image
+
+int main()
+{
+    float   image[ 8 ][ 8 ];  //  
+    int     count   = 0;
+    
+    matrix.start();
+
+    while(1) {
+        
+        //  making 8x8 image to "image" array
+        for ( int i = 0; i < 8; i++ )
+            for ( int j = 0; j < 8; j++ )
+                image[ i ][ j ]   = func( i, j, count * 0.2 );
+
+        //  set the image into library internal bufer
+        matrix.set_data( image );
+
+        count++;
+        wait( 0.05 );
+    }
+}
+
+float func( float x, float y, float t )
+{
+//#define     DISPLAY_OFFSET  3.5
+#define     DISPLAY_OFFSET  0
+#define     SIZE            0.3
+
+    float   s;
+    
+    x   = (x - DISPLAY_OFFSET) * SIZE;
+    y   = (y - DISPLAY_OFFSET) * SIZE;
+
+    s   = cos( powf( x * x + y * y, 0.5 ) - t );
+    return ( powf( s, 4.0 ) );
+}