From 0b624384cd52be20e61284551d832b499d7b7707 Mon Sep 17 00:00:00 2001
From: Jonathan McCrohan <jmccrohan@gmail.com>
Date: Sat, 14 Apr 2012 12:56:48 +0100
Subject: Imported Upstream version 2.1.8.20120216

---
 cphidgetweightsensor.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 cphidgetweightsensor.c

(limited to 'cphidgetweightsensor.c')

diff --git a/cphidgetweightsensor.c b/cphidgetweightsensor.c
new file mode 100644
index 0000000..7a54e2e
--- /dev/null
+++ b/cphidgetweightsensor.c
@@ -0,0 +1,116 @@
+#include "stdafx.h"
+#include "cphidgetweightsensor.h"
+#include "cusb.h"
+#include "csocket.h"
+#include "cthread.h"
+#include <math.h>
+
+// === Internal Functions === //
+
+//clearVars - sets all device variables to unknown state
+CPHIDGETCLEARVARS(WeightSensor)
+
+	phid->Weight = PUNI_DBL;
+	phid->lastweight = PUNK_DBL;
+	phid->WeightChangeTrigger = PUNI_DBL;
+
+	return EPHIDGET_OK;
+}
+
+//initAfterOpen - sets up the initial state of an object, reading in packets from the device if needed
+//				  used during attach initialization - on every attach
+CPHIDGETINIT(WeightSensor)
+	TESTPTR(phid);
+
+	//initialize triggers, set data arrays to unknown
+	phid->Weight = PUNK_DBL;
+	phid->lastweight = PUNK_DBL;
+	phid->WeightChangeTrigger = 0.1;
+
+	//issue one read
+	CPhidget_read((CPhidgetHandle)phid);
+
+	return EPHIDGET_OK;
+}
+
+//dataInput - parses device packets
+CPHIDGETDATA(WeightSensor)
+	double Weight = 0;
+
+	if (length<0) return EPHIDGET_INVALIDARG;
+	TESTPTR(phid);
+	TESTPTR(buffer);
+	
+	//Parse device packets - store data locally
+	switch(phid->phid.deviceIDSpec)
+	{
+		case PHIDID_WEIGHTSENSOR:
+			Weight = (((double)((unsigned short)buffer[0]+((unsigned short)buffer[1]<<8))) / 100.0 ) - 40.0;
+			Weight = round_double(Weight, 2);
+			break;
+		default:
+			return EPHIDGET_UNEXPECTED;
+	}
+
+	//store to structure
+	phid->Weight = Weight;
+
+	//send out any events that exceed or match the trigger
+	if (fabs(phid->Weight - phid->lastweight) >= phid->WeightChangeTrigger || phid->lastweight == PUNK_DBL)
+	{
+		FIRE(WeightChange, phid->Weight);
+		phid->lastweight = phid->Weight;
+	}
+	return EPHIDGET_OK;
+}
+
+//eventsAfterOpen - sends out an event for all valid data, used during attach initialization
+CPHIDGETINITEVENTS(WeightSensor)
+	if (phid->Weight != PUNK_DBL)
+	{
+		FIRE(WeightChange, phid->Weight);
+		phid->lastweight = phid->Weight;
+	}
+	return EPHIDGET_OK;
+}
+
+//getPacket - not used for WeightSensor
+CGETPACKET(WeightSensor)
+	return EPHIDGET_UNEXPECTED;
+}
+
+// === Exported Functions === //
+
+//create and initialize a device structure
+CCREATE(WeightSensor, PHIDCLASS_WEIGHTSENSOR)
+
+//event setup functions
+CFHANDLE(WeightSensor, WeightChange, double)
+
+CGET(WeightSensor,Weight,double)
+	TESTPTRS(phid,pVal) 
+	TESTDEVICETYPE(PHIDCLASS_WEIGHTSENSOR)
+	TESTATTACHED
+	TESTMASGN(Weight, PUNK_DBL)
+	MASGN(Weight)
+}
+
+CGET(WeightSensor,WeightChangeTrigger,double)
+	TESTPTRS(phid,pVal) 
+	TESTDEVICETYPE(PHIDCLASS_WEIGHTSENSOR)
+	TESTATTACHED
+	TESTMASGN(WeightChangeTrigger, PUNK_DBL)
+	MASGN(WeightChangeTrigger)
+}
+CSET(WeightSensor,WeightChangeTrigger,double)
+	TESTPTR(phid) 
+	TESTDEVICETYPE(PHIDCLASS_WEIGHTSENSOR)
+	TESTATTACHED
+	TESTRANGE(0, 300)
+	if(CPhidget_statusFlagIsSet(phid->phid.status, PHIDGET_REMOTE_FLAG))
+		ADDNETWORKKEY(Trigger, "%lE", WeightChangeTrigger);
+	else
+		phid->WeightChangeTrigger = newVal;
+	return EPHIDGET_OK;
+}
+
-- 
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