akibaLEDピカリ館で販売している単色LEDパネル（32cm×16cm）を専用基盤を使わずRaspberry Piとnode.jsを使いパターン点灯させるサンプル。Raspberry Pi（256MB以上）、Node.js 0.12で動作確認済み。

picari-01.js

'use strict';

// akibaLEDピカリ館の単色LEDマトリクスパネルP10を
// Raspberry Piのnode.js(v0.12)で光らせる
//
// 配線については http://cl.hatenablog.com/entry/picari-ledmatrix-raspberrypi 参照
// Usage:
// （Raspberry PiにRaspbian Wheezyをインストールして、piユーザでログイン後）
// git clone https://gist.github.com/aad7b6ad8f97ca9a8a2a.git picari
// cd $_
// npm install onoff pi-spi
// sudo node picalri-01.js

// #Use libs

var SPI  = require('pi-spi');
var Gpio = require('onoff').Gpio;

// #define

var HIGH = 1;
var LOW  = 0;

var OE    = 22; // GPIO22(15pin)
var DYNA  = 24; // GPIO24(18pin)
var DYNB  = 23; // GPIO23(16pin)
var LATCH = 25; // GPIO25(22pin)
// MOSI(19pin):SPI DATA OUTPUT
// SCLK(23pin):SPI CLOCK

var WAIT  = 1; // 0: 410Hz, 1: 250Hz

var pattern = [
  0,1,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,
  0,0,1,0,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,
  0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,
  1,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,
  0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,
  0,0,1,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,
  0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,
  0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,
  0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,
  0,0,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,
  0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,
  0,1,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,
  1,0,0,0,0,0,1,1,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,
  1,0,0,0,1,1,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
];

// SPI/GPIO初期化

var spi = SPI.initialize('/dev/spidev0.0');
spi.clockSpeed(7812500); // 7.8MHz(15.6MHzだと取りこぼしがみられた）
//spi.bitOrder(SPI.order.LSB_FIRST); // パネル仕様ではLSBだがpi-spiでエラーになるので

var oe    = new Gpio(OE   , 'out');
var dyna  = new Gpio(DYNA , 'out');
var dynb  = new Gpio(DYNB , 'out');
var latch = new Gpio(LATCH, 'out');

oe.writeSync(LOW);  // 消灯
dyna.writeSync(LOW); // ライン0より走査
dynb.writeSync(LOW); // ライン0より走査
latch.writeSync(LOW);  // ラッチ

// VRAM初期化

var vram = [
  new Buffer(16),
  new Buffer(16),
  new Buffer(16),
  new Buffer(16)
];
var workVram = [
  new Buffer(16),
  new Buffer(16),
  new Buffer(16),
  new Buffer(16)
];

for (var i = 0; i < 4; i++) {
  var buf = new Buffer(16); // LEDパネル1面分（画素512bitのうち1回の駆動での画素128bit=16byte）
  vram[i].copy(buf);
  buf.fill(255); // bufferクリア
  // 配列からbufferに転記するループ
  for (var j = 0; j < 16; j++) {
    var s = 255;
    for (var k = 0; k < 8; k++) {
      s = s - (pattern[i * 32 + ((15 - j) % 4) * 128 + (j >> 2) * 8 + k] << (7 -k));
    }
    buf.writeUInt8(s, j);
    //console.log("i:"+i+" j:"+j+ " s:"+s);
  }
  vram[i] = buf;
}

var loop = function(i) { // i: 表示ライン（0～3）
  i %= 4;
  // ティアリング防止のため第0ライン表示時に画素を固定する
  if (i == 0) {
    vram[0].copy(workVram[0]);
    vram[1].copy(workVram[1]);
    vram[2].copy(workVram[2]);
    vram[3].copy(workVram[3]);
  }

  // SPI転送
  spi.write(workVram[i], function(e) {
    if (e) console.error(e);
    // LEDパネル制御線の操作
    oe.writeSync(LOW);       // パネル消灯
    dyna.write(i & 1);       // ダイナミック点灯桁指定(LOW)
    dynb.write(i >> 1 & 1);  // ダイナミック点灯桁指定(HIGH)
    latch.write(HIGH);       // ラッチ解除
    oe.write(HIGH);          // パネル点灯
    latch.write(LOW);        // ラッチ
    var timerId1 = setTimeout(function() {loop(++i);}, WAIT); // 0: 410Hz, 1: 250Hz
    //var timerId2 = setImmediate( function() { f(++i); }); // 410Hz
  });
};

var main = function() {
  
  process.on('SIGINT', function() {
    oe.writeSync(LOW);  // 消灯
    console.log('');
    process.exit(0);
  });
  
  loop(0);
};
main();