Adafruit's 32x32 RGB LED matrix panel

Using the attached as a test image with the following code, I ve got times of 1.43 seconds to fill a screen, however disabling the pin outputs the time falls down to 0.96 seconds, so I am sure more can be done to be optimized probably using assembler as the logic is actually quite simple, I expect this to be useful to someone with more skills that can improve it or changed to make it usable.

//pin B2 as B1
//pin B3 as G1
//pin B4 as R1
//pin B5 as B2
//pin B6 as G2
//pin B7 as G3
//pin B8 as clock
//pin b9 as Latch
//pin b13 as OE
var TONES=1;
console.log(getTime());
 var image = require("fs").readFile("GIF/wizardcity00­001.bmp", "binary");
image = image.substr(54,image.length);
var bytes = new Uint8Array(4096);
for (var j=0;j<4096;j++){ 
  bytes[j]=Math.round(image[j].charCodeAt(­)*TONES/256);
}
console.log(getTime());
console.log(process.memory());
image='';
console.log(process.memory());


function rcolor(x){
  return (TONES*x/256);
}

function clock(){
  digitalWrite(B8,1);
  digitalWrite(B8,0);
}

function latch(){
  digitalWrite(B9,1);
  digitalWrite(B9,0);
}

//function linea(y){
//  return (y-1)*128;
//}
function linea(y){
  if (y==1) {return 0;}
  if (y==2) {return 128;}
  if (y==3) {return 256;}
  if (y==4) {return 384;}
  if (y==5) {return 512;}
  if (y==6) {return 640;}
  if (y==7) {return 768;}
  if (y==8) {return 896;}
  if (y==9) {return 1024;}
  if (y==10) {return 1152;}
  if (y==11) {return 1280;}
  if (y==12) {return 1408;}
  if (y==13) {return 1536;}
  if (y==14) {return 1664;}
  if (y==15) {return 1792;}
  if (y==16) {return 1920;}
  if (y==17) {return 2048;}
  if (y==18) {return 2176;}
  if (y==19) {return 2304;}
  if (y==20) {return 2432;}
  if (y==21) {return 2560;}
  if (y==22) {return 2688;}
  if (y==23) {return 2816;}
  if (y==24) {return 2944;}
  if (y==25) {return 3072;}
  if (y==26) {return 3200;}
  if (y==27) {return 3328;}
  if (y==28) {return 3456;}
  if (y==29) {return 3584;}
  if (y==30) {return 3712;}
  if (y==31) {return 3840;}
  if (y==32) {return 3968;}
}

function toled(){
  var c=0;
  var v=0;
  var abcd = 0;
  for (var f=0;f<TONES;f++){
    for (var i=32;i>24;i--){
      digitalWrite(B13,1);
      abcd=32-i+1;
      y=linea(i);
      z=y+127;
      w=linea(i-8);
      x=w+127;
      for (var k=y;k<z+1;k=k+4){
        //if(rcolor(bytes[k])>c){
        if(bytes[k]>c){
          digitalWrite(B2,1);
        } else {
          digitalWrite(B2,0);
        }
        //if(rcolor(bytes[k+1])>c){
        if(bytes[k+1]>c){
          digitalWrite(B3,1);
        } else {
          digitalWrite(B3,0);
        }
        //if(rcolor(bytes[k+2])>c){
        if(bytes[k+2]>c){
          digitalWrite(B4,1);
        } else {
          digitalWrite(B4,0);
        }
        clock();
        w+=4;
        c+=1;
      }
    latch();
    }
    c=0;
    for (var i=16;i>8;i--){
      digitalWrite(B13,1);
      abcd=32-i+1;
      y=linea(i);
      z=y+127;
      w=linea(i-8);
      x=w+127;
      for (var k=y;k<z+1;k=k+4){
        //if(rcolor(bytes[k])>c){
        if(bytes[k]>c){
          digitalWrite(B5,1);
        } else {
          digitalWrite(B5,0);
        }
        //if(rcolor(bytes[k+1])>c){
        if(bytes[k+1]>c){
          digitalWrite(B6,1);
        } else {
          digitalWrite(B6,0);
        }
        //if(rcolor(bytes[k+2])>c){
        if(bytes[k+2]>c){
          digitalWrite(B7,1);
        } else {
          digitalWrite(B7,0);
        }
        clock();
        w+=4;
        c+=1;
      }
    latch();
    }
  }
}



function onInit(){
  while (digitalRead(BTN1) == 0){
  var t =getTime();
  toled();
  console.log(' out ', t - getTime());
  }
  console.log(process.memory());
}  

1 Attachment

• wizardcity00001.bmp