RTC Clock POC

firmware.js

var LCD = {};
LCD.connect = function(/*=SPI*/_spi, /*=PIN*/_dc, /*=PIN*/_ce, /*=PIN*/_rst, callback) {
  var LCD = Graphics.createArrayBuffer(84,48,1,{vertical_byte:true});
  var spi = _spi;
  var dc = _dc;
  var ce = _ce;
  var rst = _rst;
  setTimeout(function() {
    digitalWrite(dc,0); // cmd
    digitalPulse(rst, 0, 10); // pulse reset low
    
    setTimeout(function() {      
      spi.send(
        [0x21, // fnset extended
        0x80 | 0x3F, // setvop (experiment with 2nd val to get the right contrast)
        0x14, // setbias 4
        0x04 | 0x02, // temp control
        0x20, // fnset normal
        0x08 | 0x04], ce); // dispctl normal
      if (callback!==undefined) callback();
    }, 100);
  }, 100);

  LCD.flip = function () {
    digitalWrite(dc,0); // cmd
    spi.send([0x40,0x80],ce); // X + Y addr (0,0)
    digitalWrite(dc,1); // data
    spi.send(this.buffer,ce);
  };
  LCD.setContrast = function(c) { // c between 0 and 1. 0.5 is default
    digitalWrite(dc,0); // cmd
    spi.send(
        [0x21, // fnset extended
        0x80 | Math.clip(c*0x7f,0,0x7f), // setvop
        0x20, // fnset normal
        0x08 | 0x04], ce); // dispctl normal
  };
  return LCD;
};

var rtcDateMath = {
  rtcToDate: function(rtcArray) {
    var seconds = 0,
        minutes = 1,
        hours = 2,
        day = 3,
        date = 4,
        month = 5,
        year = 6;
    var workingArray = [
      [],
      [],
      [],
      [],
      [],
      [],
      []
    ];

    var finalArray = [0,0,0,0,0,0,0];
    // console.log("Convert BCD into working arrays");
    // Convert BCD into working arrays
    for (var i = 0; i < 7; i++) {
      for (var j = 0; j < 8; j++) {
        workingArray[i][j] = rtcArray[i] & 1<<j;
      }
    }

    // console.log(workingArray);

    // console.log("Convert BCD");
    // Convert BCD
    for (i = 0; i < 7; i++) {
      for (j = 0; j <= 3; j++) {
        finalArray[i] += workingArray[i][j];
      }
      if (i !== hours) {
        for (j = 4; j <= 7; j++) {
          finalArray[i] += workingArray[i][j] / 16 * 10;
        }
      }
    }

    // console.log("Handle hours specially");
    // Hours need to be handled specially.
    finalArray[hours] += workingArray[hours][4] / 16 * 10;
    if (workingArray[hours][6] === 0) {
      // 24-hour mode
      finalArray[hours] += workingArray[hours][5] / 16 * 10;
    } else {
      // 12-hour mode
      finalArray[hours] += workingArray[hours][5] / 16 * 12;
    }

    // console.log("Fix year");
    // Fix year, nasty hack way
    if (finalArray[year] < 70) {
      finalArray[year] += 2000;
    } else {
      finalArray[year] += 1900;
    }

    // console.log(finalArray);

    // console.log("Convert to strings");
    // Convert to strings
    var doublize = [seconds, minutes];
    var stringArray = finalArray.map(function(i,j) { 
      if (i-10<0 && doublize.indexOf(j) !== -1) {
        return "0"+i;
      } else {
        return ""+i;
      }
    });

    // console.log("Assemble output string");
    var outputString = 
      stringArray[year] + '-' + stringArray[month] + '-' +
      stringArray[date] + 'T' + stringArray[hours] + ':' + 
      stringArray[minutes] + ':' + stringArray[seconds] + '';
    // console.log("done!");
    return outputString;
  }
};

var testRTCMath = function() {
  I2C1.writeTo(104,0);
  var c = I2C1.readFrom(104,7);
  return rtcDateMath.rtcToDate(c);
};

var clockInterval;
var rawData = [];
var startClock = function() {
  clockInterval = setInterval(function() {
    I2C1.writeTo(104,0);
    var readArray = I2C1.readFrom(104,7);
    var changed = false;
    for (var i = 0; i < 7; i++) {
      if (rawData[i] !== readArray[i]) {
        changed = true;
      }
    }
    if (changed) {
      var months = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
      var date = new Date(rtcDateMath.rtcToDate(readArray));
      var minutes = date.getMinutes();
      minutes = (minutes-9>0)?minutes:"0"+minutes;
      var seconds = date.getSeconds();
      seconds = (seconds-9>0)?seconds:"0"+seconds;
      var s = date.getHours() + ":" + minutes + ":" + seconds;
      var d = date.getTime() / 1000;

      g.clear();
      g.setFontVector(16);
      g.drawString(s,0,0);

      g.setFontVector(10);
      s = months[date.getMonth()] + " " + date.getDate() + ", " + date.getFullYear();
      g.drawString(s,0,20);
      
      for (var i = 31; i >=0; i--) { 
        for (var j = 38; j < 45; j++) {
          g.setPixel((31-i)+20, j, d&1<<i?1:0);
        }
      }

      g.drawRect(18,36,53,47);

      g.flip();
      rawData = readArray;
    }
  }, 100);
};

var stopClock = function() {
  clearInterval(clockInterval);
};

var g;

var onInit = function() {

  I2C1.setup({scl:B6,sda:B7});

  var ledState = false;
  var throbInterval = setInterval(function() {
    ledState = !ledState;
    digitalWrite(LED3, ledState);
  }, 250);

  setTimeout(function() {
    clearInterval(throbInterval);
    digitalWrite(LED3, 0);
    SPI1.setup({ sck:A5, mosi:A7 });
    g = LCD.connect(SPI1,B0,B1,B10, function() {
      g.setContrast(0.45);
      g.clear();
      g.drawString("Clock Initialzing",0,0);
      g.drawLine(0,10,84,10);
      g.flip();
      analogWrite(A3, 0.5, {freq: 120});
      g.setFontVector(18);
      startClock();
    });
  },2000);
};

save();