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/*******************************************************************************
Copyright 2010 Whole Foods Co-op
This file is part of IT CORE.
IT CORE is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
IT CORE is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
in the file license.txt along with IT CORE; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*********************************************************************************/
/*************************************************************
* SPH_Magellan_Scale
* SerialPortHandler implementation for the magellan scale
*
* Sets up a serial connection in the constructor
*
* Polls for data in Read(), writing responses back to the
* scale as needed and pushing data into the correct
* WebBrowser frame
*
* Sends beep requests to the scale in PageLoaded(Uri) as
* determined by frame #1
*************************************************************/
/* --COMMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* 27Oct2012 Eric Lee Added Code 39 handling to ParseData()
*/
using System;
using System.IO;
using System.IO.Ports;
using System.Threading;
using System.Diagnostics;
using System.Collections.Generic;
namespace SPH {
public class SPH_Magellan_Scale : SerialPortHandler
{
enum WeighState { None, Motion, Over, Zero, NonZero, Under };
private WeighState scale_state;
private Object writeLock = new Object();
private string last_weight;
private Stopwatch status_gate;
private const int STATUS_POLL_TIMEOUT = 500;
private const int SCALE_STATUS_DIED = 5000;
private bool usingS11 = false;
public SPH_Magellan_Scale(string p) : base(p)
{
sp = new SerialPort();
sp.PortName = this.port;
sp.BaudRate = 9600;
sp.DataBits = 7;
sp.StopBits = StopBits.One;
sp.Parity = Parity.Odd;
sp.RtsEnable = true;
sp.Handshake = Handshake.None;
sp.ReadTimeout = 500;
scale_state = WeighState.None;
last_weight = "0000";
status_gate = new Stopwatch();
sp.Open();
}
public override void SetConfig(Dictionary<string,string> d)
{
if (d.ContainsKey("dualPollMode") && d["dualPollMode"].ToLower() == "true") {
this.usingS11 = true;
}
}
override public void HandleMsg(string msg)
{
if (msg == "errorBeep") {
Beeps(3);
} else if (msg == "beepTwice") {
Beeps(2);
} else if (msg == "goodBeep") {
Beeps(1);
} else if (msg == "twoPairs") {
Thread.Sleep(300);
Beeps(2);
Thread.Sleep(300);
Beeps(2);
} else if (msg == "rePoll") {
/* ignore these commands on purpose
scale_state = WeighState.None;
GetStatus();
*/
} else if (msg == "wakeup") {
scale_state = WeighState.None;
GetStatus();
} else if (msg == "reBoot") {
scale_state = WeighState.None;
lock (writeLock) {
sp.Write("S10\r");
Thread.Sleep(5000);
sp.Write("S14\r");
}
}
}
private void Beeps(int num)
{
lock (writeLock) {
int count = 0;
while(count < num) {
sp.Write("S334\r");
Thread.Sleep(150);
count++;
}
}
}
/**
If we haven't heard from the scale recently, query its status
Otherwise request the next stable weight
*/
private void GetStatus()
{
if (!usingS11 || status_gate.ElapsedMilliseconds > STATUS_POLL_TIMEOUT) {
lock (writeLock) {
sp.Write("S14\r");
}
status_gate.Restart();
} else {
lock (writeLock) {
sp.Write("S11\r");
}
}
}
override public void Read()
{
string buffer = "";
if (this.verbose_mode > 0) {
System.Console.WriteLine("Reading serial data");
}
status_gate.Start();
GetStatus();
while (SPH_Running) {
try {
int b = sp.ReadByte();
if (b == 13) {
if (this.verbose_mode > 0) {
System.Console.WriteLine("RECV FROM SCALE: "+buffer);
}
buffer = this.ParseData(buffer);
if (buffer != null) {
if (this.verbose_mode > 0) {
System.Console.WriteLine("PASS TO POS: "+buffer);
}
this.PushOutput(buffer);
}
buffer = "";
} else {
buffer += ((char)b).ToString();
}
if (usingS11 && status_gate.ElapsedMilliseconds > SCALE_STATUS_DIED) {
GetStatus();
}
} catch {
Thread.Sleep(100);
}
}
}
private void PushOutput(string s)
{
parent.MsgSend(s);
}
private string ParseData(string s)
{
if (s.Substring(0,2) == "S0") { // scanner message
if (s.Substring(0,4) == "S08A" || s.Substring(0,4) == "S08F") { // UPC-A or EAN-13
return s.Substring(4);
} else if (s.Substring(0,4) == "S08E") { // UPC-E
return this.ExpandUPCE(s.Substring(4));
} else if (s.Substring(0,4) == "S08R") { // GTIN / GS1
return "GS1~"+s.Substring(3);
} else if (s.Substring(0,5) == "S08B1") { // Code39
return s.Substring(5);
} else if (s.Substring(0,5) == "S08B2") { // Interleaved 2 of 5
return s.Substring(5);
} else if (s.Substring(0,5) == "S08B3") { // Code128
return s.Substring(5);
} else {
return s; // catch all
}
} else if (s.Substring(0,2) == "S1") { // scale message
/**
The scale supports two primary commands:
S11 is "get stable weight". This tells the scale to return
the next stable non-zero weight.
S14 is "get state". This tells the scale to return its
current state.
The "scale_state" variable tracks all six known scale states.
The state is only changed if the status response is different
than the current state and this only returns a non-null string
when the state changes. The goal is to only pass a message back
to POS once per state change. The "last_weight" is tracked in
case the scale jumps directly from one stable, non-zero weight
to another without passing through another state in between.
*/
if (s.Substring(0,3) == "S11") { // stable weight following weight request
GetStatus();
if (scale_state != WeighState.NonZero || last_weight != s.Substring(3)) {
scale_state = WeighState.NonZero;
last_weight = s.Substring(3);
return s;
}
} else if (s.Substring(0,4) == "S140") { // scale not ready
GetStatus();
if (scale_state != WeighState.None) {
scale_state = WeighState.None;
return "S140";
}
} else if (s.Substring(0,4) == "S141") { // weight not stable
GetStatus();
if (scale_state != WeighState.Motion) {
scale_state = WeighState.Motion;
return "S141";
}
} else if (s.Substring(0,4) == "S142") { // weight over max
GetStatus();
if (scale_state != WeighState.Over) {
scale_state = WeighState.Over;
return "S142";
}
} else if (s.Substring(0,4) == "S143") { // stable zero weight
GetStatus();
if (scale_state != WeighState.Zero) {
scale_state = WeighState.Zero;
return "S110000";
}
} else if (s.Substring(0,4) == "S144") { // stable non-zero weight
GetStatus();
if (scale_state != WeighState.NonZero || last_weight != s.Substring(4)) {
scale_state = WeighState.NonZero;
last_weight = s.Substring(4);
return "S11"+s.Substring(4);
}
} else if (s.Substring(0,4) == "S145") { // scale under zero weight
GetStatus();
if (scale_state != WeighState.Under) {
scale_state = WeighState.Under;
return "S145";
}
} else {
GetStatus();
return s; // catch all
}
} else { // not scanner or scale message
return s; // catch all
}
return null;
}
private string ExpandUPCE(string upc)
{
string lead = upc.Substring(0,upc.Length-1);
string tail = upc.Substring(upc.Length-1);
if (tail == "0" || tail == "1" || tail == "2") {
return lead.Substring(0,3)+tail+"0000"+lead.Substring(3);
} else if (tail == "3") {
return lead.Substring(0,4)+"00000"+lead.Substring(4);
} else if (tail == "4") {
return lead.Substring(0,5)+"00000"+lead.Substring(5);
} else {
return lead+"0000"+tail;
}
}
}
}
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