Bigram builds since early november are bad.

Something bad happened to setWatch() events in bigram builds sometime in november.

Using this debug module code:

exports.connect = function(pin) {
    return new DHT22(pin);
}

function DHT22(pin) {
  this.pin = pin;
  this.readfails=0;
  this.tout=0;
  this.hout=0;
  this.cks=0; 
}
DHT22.prototype.read = function (a) {
    this.onreadf=a;
    this.i=0;
    this.tout=0;
    this.hout=0;
    this.cks=0; 
    pinMode(this.pin);
    var dht = this;
    digitalWrite(this.pin,0);
    this.watch=setWatch(function(t) {dht.onwatch(t);},dht.pin,{repeat:true});
    setTimeout(function() {pinMode(dht.pin,'input_pullup');},3);
    setTimeout(function() {dht.onread(dht.endRead());},50);
};
DHT22.prototype.onread= function(d) {
    var dht=this;
    if (d.temp==-1) {
        dht.readfails++
        if(dht.readfails < 20) {
            dht.read(dht.onreadf);
        } else {
            dht.onreadf(d);
            dht.readfails=0;
        }
    } else {
        dht.readfails=0;
        dht.onreadf(d);
    }
};
DHT22.prototype.onwatch = function(t) {
    if (t.state) {
        this.pstart=t.time;
    } else {
        var tt=t.time-this.pstart;
        if (tt < 0.0002) {
            this.recbit(tt,this.i);
            this.i++;
        }
    }
};
DHT22.prototype.recbit = function(plen,bit) {
    if (bit==0){} else if (bit < 17) {
        this.hout=(this.hout<<1) | (plen > 0.0000382);
    } else if (bit < 33) {
        this.tout=(this.tout<<1) | (plen > 0.0000382);
    } else {
        this.cks=(this.cks<<1) | (plen > 0.0000382);
    }
    console.log("bit"+bit+" "+plen);
}
DHT22.prototype.endRead = function() {
    clearWatch(this.watch);
    var tcks = this.hout&0xFF;
    tcks+= (this.hout>>8)&0xFF;
    tcks+= (this.tout&0xFF);
    tcks+= (this.tout>>8)&0xFF;
    tcks=tcks&0xFF;
    if (tcks==this.cks && this.hout > 0 && this.tout > 0) {
        var rh=this.hout*0.1;
        var temp=this.tout*0.1;
        if (this.tout&0x8000) {
            temp=temp*-1;
        }
        if (rh < 100 ) {
            return {"temp":temp,"rh":rh};
        }
    }
    console.log()
    return {"temp":-1,"rh":-1};
};

Running this code:

var d=require("DHT22").connect(A1);
setTimeout("d.read(function(a){console.log(a);});",2000);

On 11/11 bigram github (effectively v71), release v71, and latest github build (all wiznet):

>reset();
=undefined
 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v72 Copyright 2014 G.Williams
>echo(0);
=undefined
bit0 0.00008106231
bit1 0.00002574920
bit2 0.00002574920
bit3 0.00002574920
bit4 0.00002574920
bit5 0.00002670288
bit6 0.00002670288
bit7 0.00002670288
bit8 0.00007247924
bit9 0.00002574920
bit10 0.00007343292
bit11 0.00002670288
bit12 0.00007438659
bit13 0.00002670288
bit14 0.00007343292
bit15 0.00007343292
bit16 0.00002479553
bit17 0.00002670288
bit18 0.00002574920
bit19 0.00002574920
bit20 0.00002574920
bit21 0.00002574920
bit22 0.00002574920
bit23 0.00002574920
bit24 0.00002479553
bit25 0.00007343292
bit26 0.00007343292
bit27 0.00007343292
bit28 0.00002574920
bit29 0.00002574920
bit30 0.00007438659
bit31 0.00002670288
bit32 0.00002574920
bit33 0.00002574920
bit34 0.00002574920
bit35 0.00007343292
bit36 0.00007343292
bit37 0.00007343292
bit38 0.00002670288
bit39 0.00007343292
bit40 0.00007247924
{ "temp": 22.8, "rh": 34.2 }

On latest bigram wiznet build based on 12/28 github sync. Similar results observed with 11/24 bigram:

>reset();
=undefined
 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v72 Copyright 2014 G.Williams
>echo(0);
=undefined
bit0 -223.99997234344
bit1 0.00002765655
bit2 -1103.99997329711
bit3 0.00002670288
bit4 -1119.99997329711
bit5 -335.99992275238
bit6 -239.99997425079
bit7 -575.99997234344
bit8 -1023.99997329711
bit9 -1247.99997329711
bit10 -975.99992275238
bit11 -79.99992275238
bit12 -1055.99992465972
bit13 -1119.99997234344
bit14 -303.99997234344
bit15 -911.99992275238
bit16 -191.99997425079
>
{ "temp": -1, "rh": -1 }
>

Gordon - do you have any idea what might have changed here, and what I have to do to get my bigram builds working again?

All that I do in the bigram builds is replace the board definition with one reporting 512k flash 64k ram and kick off the build - i'm really baffled as to what it could be that causes it to get confused when handling events. This happens on all three of my espruino boards (which all have run bigram with no problems until this).