added double buffering to prevent tearning

[Arduino] / Hub08_LedMatrix / Hub08_LedMatrix.ino

diff --git a/Hub08_LedMatrix/Hub08_LedMatrix.ino b/Hub08_LedMatrix/Hub08_LedMatrix.ino
index f23ceaf..ce96623 100644 (file)
--- a/Hub08_LedMatrix/Hub08_LedMatrix.ino
+++ b/Hub08_LedMatrix/Hub08_LedMatrix.ino
@@ -21,27 +21,22 @@
 #include "LEDMatrix.h"
 #include "font.h"
 
-#define WIDTH   64
+#define WIDTH   64*1 // 2 panels * 64
 #define HEIGHT  16
 
+#if USE_SPI
+#include <SPI.h> // Arduino IDE compilation won't work without this
+#endif
+
+// hub08 pinout: la lb lc ld en  r1  lat  clk            
 //     LEDMatrix(a, b, c, d, oe, r1, stb, clk);
 LEDMatrix matrix(4, 5, 6, 7, 9,  11, 10,  13);
 
 // Display Buffer 128 = 64 * 16 / 8
-uint8_t displaybuf[WIDTH * HEIGHT / 8] = {
-    0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x01, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x01, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60,
-    0x01, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x00, 0xE0, 0x07, 0x8F, 0xC7, 0xC7, 0xC7, 0xE0,
-    0x00, 0x40, 0x0C, 0xCE, 0x6C, 0x6C, 0x6C, 0xE0, 0x00, 0xE0, 0x0C, 0x0C, 0x6C, 0x6C, 0x6C, 0x60,
-    0x01, 0xF0, 0x07, 0x8C, 0x6F, 0xEF, 0xEC, 0x60, 0x23, 0xF8, 0x00, 0xCC, 0x6C, 0x0C, 0x0C, 0x60,
-    0x33, 0xF8, 0x0C, 0xCE, 0x6C, 0x6C, 0x6C, 0xE0, 0x3B, 0xF8, 0x07, 0x8F, 0xC7, 0xC7, 0xC7, 0xE0,
-    0x3B, 0xF8, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x1B, 0xF8, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x00,
-    0x0B, 0xF8, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x07, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-};
+uint8_t displaybuf[(WIDTH/8) * HEIGHT*2];
 
 uint8_t displaybuf_w[((WIDTH/8)+1) * HEIGHT];
 
-
 byte cell[16];
 
 void MatrixWriteCharacter(int x,int y, char character)
@@ -60,7 +55,7 @@ void MatrixWriteCharacter(int x,int y, char character)
   }
 
   //uint8_t *pDst = displaybuf_w + (y) * ((WIDTH / 8) + 1) + x  ;
-  uint8_t *pDst = displaybuf_w + x  ;
+  uint8_t *pDst = displaybuf_w + x  + y * ((WIDTH/8)+1);
 
   byte mask = 1;
   for(int j=0; j<8; j++) {
@@ -103,7 +98,7 @@ void matrixPrint(String c) {
   //Serial.println(c.length());
   for (int i=0 ; i<c.length() ; i++) {
       MatrixWriteCharacter(i,3,c[i]);
-//      matrix.scan();
+      matrix.scan();
       //Serial.print(i);
       //Serial.print(" -> ");
       //Serial.println(c[i]);
@@ -114,7 +109,7 @@ void matrixPrint(String c) {
 void setup()
 {
     matrix.begin(displaybuf, WIDTH, HEIGHT);
-    Serial.begin(57600);
+    Serial.begin(115200);
     matrix.clear();
     //matrixPrint("12345678");
     // uint8_t *pDst = displaybuf + y * (WIDTH / 8) + x / 8;
@@ -126,30 +121,54 @@ void matrixDelay(int x) {
   
 }
 
+//String poruka="X       XX      XOX     XOOX    XOoOX   XOooOX  XOoIoOX XOoiioOX        ";
+//String poruka="        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras blandit libero id ex dapibus suscipit. Proin vitae cursus eros. Ut porttitor congue metus at viverra. In consectetur ex massa.";
+String poruka="!\"#$%&'()*+,-./0123456789:;<=>?@AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqReSsTtUuVvWwXxYyZz[\\]^_`{|}~";
+//String poruka="~";
+
+int pos = 0; // position in circular display
+
 void loop()
 {
-    matrix.clear();
-    int p=0;
-//    String poruka="X       XX      XOX     XOOX    XOoOX   XOooOX  XOoIoOX XOoiioOX        ";
-    String poruka="        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras blandit libero id ex dapibus suscipit. Proin vitae cursus eros. Ut porttitor congue metus at viverra. In consectetur ex massa.";
-
     for (int p=0; p<poruka.length() ; p++) {
-         matrix.clear();
-         matrixPrint(poruka.substring(p,p+9));
-          for (int o=0; o<8; o++) {
-               uint8_t *src  = displaybuf_w;
-               uint8_t *dest = displaybuf;
+       pos = ( pos + 1 ) % (( WIDTH / 8 )+1);
+//     int pos_ch = ( pos + (WIDTH/8) ) % (( WIDTH / 8 )+1);
+       int pos_ch = ( pos + (WIDTH/8) ) % (( WIDTH / 8 )+1);
+       MatrixWriteCharacter(pos_ch,0,poruka.charAt(p));
+
+       int step_up = ((WIDTH/8)+1)-pos; // move up one line when falling off the end of circular buffer
+
+       Serial.print(pos);
+       Serial.print(" step_up=");
+       Serial.print(step_up);
+       Serial.print(" char=");
+       Serial.println(poruka.charAt(p));
+
+       for (int o=0; o<8; o++) {
+               uint8_t *src  = displaybuf_w + pos;
+               uint8_t *dest = matrix.offscreen_buffer();
+
                int i = 0;
-               int j = 0;
+
                for (int y = 0; y < HEIGHT; y++ ) {
                        for (int x = 0; x < (WIDTH/8); x++) {
-                               *(dest + i) = ( *(src + j) << o ) | (( *(src + j + 1) & ( 0xff << 8 - o ) ) >> 8 - o );
+
+                               int j  = ( x   < step_up ? y : y-1 ) * ((WIDTH/8)+1) + x;
+                               int j1 = ( x+1 < step_up ? y : y-1 ) * ((WIDTH/8)+1) + x+1;
+
+                               *(dest + i) = ( *(src + j) << o ) | (( *(src + j1) & ( 0xff << 8 - o ) ) >> 8 - o );
+//                             *(dest + i) = *(src + j);
+#if USE_SPI
+                               matrix.scan();
+                               delayMicroseconds(100 / (WIDTH / 64));
+#else
+                               matrix.scan();
+                               delayMicroseconds(100 / (WIDTH / 64));
+#endif
                                i++;
-                               j++;
                        }
-                       j++;
-                       matrix.scan();
                 }
+                matrix.swap();
           }
     }