Scrolling text

gistfile1.txt

// scrolltext demo for Adafruit RGBmatrixPanel library.
// Demonstrates double-buffered animation on our 16x32 RGB LED matrix:
// http://www.adafruit.com/products/420

// Written by Limor Fried/Ladyada & Phil Burgess/PaintYourDragon
// for Adafruit Industries.
// BSD license, all text above must be included in any redistribution.

#if defined(SPARK)
#include "Adafruit_mfGFX/Adafruit_mfGFX.h"   // Core graphics library
#include "RGBmatrixPanel/RGBmatrixPanel.h" // Hardware-specific library
#include "math.h"
#else
#include <avr/pgmspace.h>
#include <Adafruit_GFX.h>   // Core graphics library
#include <RGBmatrixPanel.h> // Hardware-specific library
#endif

#if defined(SPARK)
 #define CLK D6
 #define OE  D7
 #define LAT A4
 #define A   A0
 #define B   A1
 #define C   A2
 
 #define pgm_read_word(addr) (*(const unsigned short *)(addr))
#else
 #define CLK 8  // MUST be on PORTB! (Use pin 11 on Mega)
 #define LAT A3
 #define OE  9
 #define A   A0
 #define B   A1
 #define C   A2
#endif

// Last parameter = 'true' enables double-buffering, for flicker-free,
// buttery smooth animation.  Note that NOTHING WILL SHOW ON THE DISPLAY
// until the first call to swapBuffers().  This is normal.
RGBmatrixPanel matrix(A, B, C, CLK, LAT, OE, true);
// Double-buffered mode consumes nearly all the RAM available on the
// Arduino Uno -- only a handful of free bytes remain.  Even the
// following string needs to go in PROGMEM:


String displayText = String("Happy Thanksgiving");
//const char str[] PROGMEM = "Happy Thanksgiving!";
int    textX   = matrix.width(),
       textMin = displayText.length() * -12,
       hue     = 0;
       
int8_t ball[3][4] = {
  {  3,  0,  1,  1 }, // Initial X,Y pos & velocity for 3 bouncy balls
  { 17, 15,  1, -1 },
  { 27,  4, -1,  1 }
};
static const uint16_t PROGMEM ballcolor[3] = {
  0x0080, // Green=1
  0x0002, // Blue=1
  0x1000  // Red=1
};

void setup() {
    Spark.function("setText", setTextFn);
    
  matrix.begin();
  matrix.setTextWrap(false); // Allow text to run off right edge
  matrix.setTextSize(2);
}

int setTextFn(String command) {
    displayText = command;
    textMin = displayText.length() * -12;
}



void loop() {
  byte i;

  // Clear background
  matrix.fillScreen(0);

  // Bounce three balls around
 // for(i=0; i<3; i++) {
    // Draw 'ball'
  //  matrix.fillCircle(ball[i][0], ball[i][1], 5, pgm_read_word(&ballcolor[i]));
    // Update X, Y position
   // ball[i][0] += ball[i][2];
  //  ball[i][1] += ball[i][3];
    // Bounce off edges
 //   if((ball[i][0] == 0) || (ball[i][0] == (matrix.width() - 1)))
//      ball[i][2] *= -1;
  //  if((ball[i][1] == 0) || (ball[i][1] == (matrix.height() - 1)))
  //    ball[i][3] *= -1;
//  }

  // Draw big scrolly text on top
  matrix.setTextColor(matrix.ColorHSV(hue, 255, 255, true));
  matrix.setCursor(textX, 1);
  matrix.print(F(displayText.c_str()));

  // Move text left (w/wrap), increase hue
  if((--textX) < textMin) textX = matrix.width();
  hue += 7;
  if(hue >= 1536) hue -= 1536;

  // Update display
  matrix.swapBuffers(false);
}