path: root/cphidgetled.c

#include "stdafx.h"
#include "cphidgetled.h"
#include "cusb.h"
#include "csocket.h"
#include "cthread.h"

// === Internal Functions === //

//clearVars - sets all device variables to unknown state
CPHIDGETCLEARVARS(LED)
	int i = 0;

	phid->changeRequests=PUNK_BOOL;

	for(i=0;i<LED_MAXLEDS;i++)
	{
		phid->changedLED_Power[i] = PUNK_BOOL;
		phid->LED_Power[i] = PUNI_DBL;
		phid->LED_CurrentLimit[i] = PUNI_DBL;
		phid->nextLED_Power[i] = PUNK_DBL;

		phid->LED_PowerEcho[i] = PUNK_DBL;
		phid->LED_CurrentLimitEcho[i] = PUNK_DBL;
		phid->outputEnabledEcho[i] = PUNK_BOOL;
		phid->ledOpenDetectEcho[i] = PUNK_BOOL;

		phid->lastLED_Power[i] = PUNK_DBL;
	}
	phid->voltage = PHIDGET_LED_VOLTAGE_2_75V;
	phid->currentLimit = PHIDGET_LED_CURRENT_LIMIT_20mA;
	phid->faultEcho = PUNK_BOOL;
	for(i=0;i<4;i++)
	{
		phid->TSDCount[i]=0;
		phid->TWarnCount[i]=0;
	}
	phid->PGoodErrState = PFALSE;
	phid->powerGoodEcho = PUNK_BOOL;
	phid->outputEnableEcho = PUNK_BOOL;
	phid->currentLimitEcho = -1;
	phid->voltageEcho = -1;

	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(LED)
	int i = 0;

	TESTPTR(phid);

	//set data arrays to unknown
	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64:
			for(i=0;i<phid->phid.attr.led.numLEDs;i++)
			{
				phid->changedLED_Power[i] = PFALSE;
				phid->LED_Power[i] = PUNK_DBL;
				phid->nextLED_Power[i] = PUNK_DBL;
			}
			break;
		case PHIDUID_LED_64_ADV:
		case PHIDUID_LED_64_ADV_M3:
			for(i=0;i<phid->phid.attr.led.numLEDs;i++)
			{
				phid->changedLED_Power[i] = PFALSE;
				phid->LED_Power[i] = PUNK_DBL;
				phid->LED_CurrentLimit[i] = PUNK_DBL;
				phid->nextLED_Power[i] = PUNK_DBL;
				
				phid->LED_PowerEcho[i] = PUNK_DBL;
				phid->LED_CurrentLimitEcho[i] = PUNK_DBL;
				phid->outputEnabledEcho[i] = PUNK_BOOL;
				phid->ledOpenDetectEcho[i] = PUNK_BOOL;

				phid->lastLED_Power[i] = PUNK_DBL;
			}
			phid->voltage = PHIDGET_LED_VOLTAGE_2_75V;
			phid->currentLimit = PHIDGET_LED_CURRENT_LIMIT_20mA;

			phid->faultEcho = PUNK_BOOL;
			phid->powerGoodEcho = PUNK_BOOL;
			phid->PGoodErrState = PFALSE;
			phid->outputEnableEcho = PUNK_BOOL;
			phid->voltageEcho = 0;
			phid->currentLimitEcho = 0;

			for(i=0;i<4;i++)
			{
				phid->TSDCount[i]=0;
				phid->TSDClearCount[i] = 0;
				phid->TWarnCount[i]=0;
				phid->TWarnClearCount[i] = 0;
			}
			phid->lastOutputPacket = 0;
			break;
		default:
			return EPHIDGET_UNEXPECTED;
	}
	phid->changeRequests=0;
	phid->controlPacketWaiting = PFALSE;
	
	//issue a read - fill in data
	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64_ADV:
			//need two reads to get the full state
			CPhidget_read((CPhidgetHandle)phid);
			CPhidget_read((CPhidgetHandle)phid);
			for(i=0;i<phid->phid.attr.led.numLEDs;i++)
			{
				if(phid->outputEnabledEcho[i] == PTRUE)
					phid->LED_Power[i] = phid->LED_PowerEcho[i];
				else
					phid->LED_Power[i] = 0;
				
				phid->lastLED_Power[i] = phid->LED_PowerEcho[i];
			}
			if(phid->voltageEcho > 0)
				phid->voltage = phid->voltageEcho;
			if(phid->currentLimitEcho > 0)
				phid->currentLimit = phid->currentLimitEcho;
			break;
		case PHIDUID_LED_64_ADV_M3:
			//need three reads to get the full state
			CPhidget_read((CPhidgetHandle)phid);
			CPhidget_read((CPhidgetHandle)phid);
			CPhidget_read((CPhidgetHandle)phid);

			for(i=0;i<phid->phid.attr.led.numLEDs;i++)
			{
				phid->LED_Power[i] = phid->LED_PowerEcho[i];
				phid->LED_CurrentLimit[i] = phid->LED_CurrentLimitEcho[i];
			}

			if(phid->voltageEcho > 0)
				phid->voltage = phid->voltageEcho;

			break;
		case PHIDUID_LED_64:
		default:
			break;
	}

	return EPHIDGET_OK;
}

//dataInput - parses device packets
CPHIDGETDATA(LED)
	int i = 0;
	char error_buffer[50];

	if (length < 0) return EPHIDGET_INVALIDARG;
	TESTPTR(phid);
	TESTPTR(buffer);

	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64_ADV:
			switch(buffer[0] & 0x80)
			{
				case LED64_IN_LOW_PACKET:
					//PowerGood
					if(buffer[0] & LED64_PGOOD_FLAG)
					{
						phid->PGoodErrState = PFALSE;
						phid->powerGoodEcho = PTRUE;
					}
					else
					{
						phid->powerGoodEcho = PFALSE;
					}

					//all outputs enabled (power on/off)
					if(buffer[0] & LED64_OE_FLAG)
						phid->outputEnableEcho = PTRUE;
					else
						phid->outputEnableEcho = PFALSE;

					//fault
					if(buffer[0] & LED64_FAULT_FLAG)
						phid->faultEcho = PTRUE;
					else
						phid->faultEcho = PFALSE;

					//current limit
					if(buffer[0] & LED64_CURSELA_FLAG)
					{
						if(buffer[0] & LED64_CURSELB_FLAG)
							phid->currentLimitEcho = PHIDGET_LED_CURRENT_LIMIT_80mA;
						else
							phid->currentLimitEcho = PHIDGET_LED_CURRENT_LIMIT_40mA;
					}
					else if (buffer[0] & LED64_CURSELB_FLAG)
						phid->currentLimitEcho = PHIDGET_LED_CURRENT_LIMIT_60mA;
					else
						phid->currentLimitEcho = PHIDGET_LED_CURRENT_LIMIT_20mA;
					
					//voltage
					if(buffer[0] & LED64_PWRSELA_FLAG)
					{
						if(buffer[0] & LED64_PWRSELB_FLAG)
							phid->voltageEcho = PHIDGET_LED_VOLTAGE_5_0V;
						else
							phid->voltageEcho = PHIDGET_LED_VOLTAGE_2_75V;
					}
					else if (buffer[0] & LED64_PWRSELB_FLAG)
						phid->voltageEcho = PHIDGET_LED_VOLTAGE_3_9V;
					else
						phid->voltageEcho = PHIDGET_LED_VOLTAGE_1_7V;

					for(i=0;i<phid->phid.attr.led.numLEDs;i++)
					{
						phid->outputEnabledEcho[i] = (buffer[(i/8)+1] & (1 << (i%8))) ? 1 : 0;
						phid->ledOpenDetectEcho[i] = (buffer[(i/8)+9] & (1 << (i%8))) ? 1 : 0;
					}

					//1st 24 LED powers
					for(i=0;i<24;i++)
					{
						double ledPowerTemp;
						ledPowerTemp = ((double)buffer[i+17] / 127.0) * 100.0;
						phid->LED_PowerEcho[i] = ledPowerTemp;
					}

					//We can guess that the fault is a TSD if there is no LOD
					if(phid->faultEcho)
					{
						phid->TSDCount[0]++;
						phid->TSDClearCount[0] = 30; //500ms of no faults before we clear it

						for(i=0;i<phid->phid.attr.led.numLEDs;i++)
						{
							if(phid->ledOpenDetectEcho[i])
								phid->TSDCount[0] = 0;
						}

						//send out some error events on faults
						//TODO: we could also send LED Open Detect?

						//we have counted three fault flags with no LODs - TSD - only one error event is thrown until this is cleared
						//less then 3 counts, and it could be a false positive
						//if outputs are not enabled then the fault should be guaranteed as a TSD
						if(phid->TSDCount[0] == 3 || (phid->TSDCount[0] < 3 && phid->outputEnableEcho == PFALSE))
						{
							phid->TSDCount[0] = 3;
							FIRE_ERROR(EEPHIDGET_OVERTEMP, "Thermal Shutdown detected.");
						}
					}
					else
					{
						if(phid->TSDClearCount[0] > 0)
							phid->TSDClearCount[0]--;
						else
							phid->TSDCount[0]=0;
					}
					
					if(!phid->powerGoodEcho && phid->PGoodErrState == PFALSE)
					{
						phid->PGoodErrState = PTRUE;
						FIRE_ERROR(EEPHIDGET_BADPOWER, "Bad power supply detected.");
					}

					break;
				case LED64_IN_HIGH_PACKET:
					
					//last 40 LED powers
					for(i=24;i<phid->phid.attr.led.numLEDs;i++)
					{
						double ledPowerTemp;
						ledPowerTemp = ((double)buffer[i-23] / 127.0) * 100.0;
						phid->LED_PowerEcho[i] = ledPowerTemp;
					}

					break;
				}
			break;
		case PHIDUID_LED_64_ADV_M3:
			switch(buffer[0] & 0x60)
			{
				case LED64_M3_IN_MISC_PACKET:
					//PowerGood
					if(buffer[0] & LED64_PGOOD_FLAG)
					{
						if(phid->PGoodErrState)
						{
							FIRE_ERROR(EEPHIDGET_OK, "Good power supply detected.");
						}
						phid->PGoodErrState = PFALSE;
						phid->powerGoodEcho = PTRUE;
					}
					else
					{
						phid->powerGoodEcho = PFALSE;
					}
					
					//voltage
					if(buffer[0] & LED64_PWRSELA_FLAG)
					{
						if(buffer[0] & LED64_PWRSELB_FLAG)
							phid->voltageEcho = PHIDGET_LED_VOLTAGE_5_0V;
						else
							phid->voltageEcho = PHIDGET_LED_VOLTAGE_2_75V;
					}
					else if (buffer[0] & LED64_PWRSELB_FLAG)
						phid->voltageEcho = PHIDGET_LED_VOLTAGE_3_9V;
					else
						phid->voltageEcho = PHIDGET_LED_VOLTAGE_1_7V;
					
					if(!phid->powerGoodEcho && phid->PGoodErrState == PFALSE)
					{
						phid->PGoodErrState = PTRUE;
						FIRE_ERROR(EEPHIDGET_BADPOWER, "Bad power supply detected.");
					}

					//Temperature Warnings
					for(i=0;i<4;i++)
					{
						if(buffer[1] & (0x01 << i))
						{						
							phid->TWarnCount[i]++;
							phid->TWarnClearCount[i] = 20; //480ms of no faults before we clear it

							if(phid->TWarnCount[i] == 10) //240 ms of fault before we call it
							{
								FIRE_ERROR(EEPHIDGET_OVERTEMP, "Temperature Warning detected on chip %d.", i);
							}
							else if(phid->TWarnCount[i] > 10)
								phid->TWarnCount[i]--; //so we don't overflow the char
						}
						else
						{
							if(phid->TWarnClearCount[i] > 0)
								phid->TWarnClearCount[i]--;
							else
							{
								if(phid->TWarnCount[i] >= 10)
								{
									FIRE_ERROR(EEPHIDGET_OK, "Temperature Warning ended on chip %d.", i);
								}
								phid->TWarnCount[i]=0;
							}
						}
					}

					//Temperature Errors
					for(i=0;i<4;i++)
					{
						if(buffer[1] & (0x10 << i))
						{						
							phid->TSDCount[i]++;
							phid->TSDClearCount[i] = 20; //480ms of no faults before we clear it

							if(phid->TSDCount[i] == 10) //240 ms of fault before we call it
							{
								FIRE_ERROR(EEPHIDGET_OVERTEMP, "Temperature Error detected on chip %d.", i);
							}
							else if(phid->TSDCount[i] > 10)
								phid->TSDCount[i]--; //so we don't overflow the char
						}
						else
						{
							if(phid->TSDClearCount[i] > 0)
								phid->TSDClearCount[i]--;
							else
							{
								if(phid->TSDCount[i] >= 10)
								{
									FIRE_ERROR(EEPHIDGET_OK, "Temperature Error ended on chip %d.", i);
								}
								phid->TSDCount[i]=0;
							}
						}
					}

					//Current Limit
					for(i=0;i<64;i++)
					{
						int index = (i*6)/8 + 2;
						int currentLimitInt = 0;
						switch(i%4)
						{
							case 0:
								currentLimitInt = buffer[index] & 0x3F;
								break;
							case 1:
								currentLimitInt = ((buffer[index] >> 6) & 0x03) + ((buffer[index+1] << 2) & 0x3C);
								break;
							case 2:
								currentLimitInt = ((buffer[index] >> 4) & 0x0F) + ((buffer[index+1] << 4) & 0x30);
								break;
							case 3:
								currentLimitInt = (buffer[index] >> 2) & 0x3F;
								break;
						}
						phid->LED_CurrentLimitEcho[i] = (currentLimitInt / 63.0) * LED64_M3_CURRENTLIMIT;
					}

					break;
				case LED64_M3_IN_LOW_PACKET:
					for(i=0;i<32;i++)
					{
						int ledPowerInt;
						int index = (i*12)/8+9;

						if(i%2 == 0)
							ledPowerInt = buffer[index] + ((buffer[index+1] & 0x0F) << 8);
						else
							ledPowerInt = ((buffer[index] & 0xF0) >> 4) + (buffer[index+1] << 4);

						phid->LED_PowerEcho[i] = (ledPowerInt / 4097.0) * 100.0;
					}
					break;
				case LED64_M3_IN_HIGH_PACKET:
					for(i=0;i<32;i++)
					{
						int ledPowerInt;
						int index = (i*12)/8+9;

						if(i%2 == 0)
							ledPowerInt = buffer[index] + ((buffer[index+1] & 0x0F) << 8);
						else
							ledPowerInt = ((buffer[index] & 0xF0) >> 4) + (buffer[index+1] << 4);

						phid->LED_PowerEcho[i+32] = (ledPowerInt / 4097.0) * 100.0;
					}
					break;
				}
			break;
		case PHIDUID_LED_64:
		default:
			return EPHIDGET_UNEXPECTED;
	}

	return EPHIDGET_OK;
}

//eventsAfterOpen - sends out an event for all valid data, used during attach initialization - not used
CPHIDGETINITEVENTS(LED)
	phid = 0;
	return EPHIDGET_OK;
}

//getPacket - used by write thread to get the next packet to send to device
CGETPACKET(LED)
	int i = 0;
	int numLeds = 0;

	CPhidgetLEDHandle phid = (CPhidgetLEDHandle)phidG;

	TESTPTRS(phid, buf)
	TESTPTR(lenp)

	if (*lenp < phid->phid.outputReportByteLength)
		return EPHIDGET_INVALIDARG;

	CThread_mutex_lock(&phid->phid.outputLock);
	
	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64:
			//construct the packet, with up to 4 LED sets
			for (i = 0; i < phid->phid.attr.led.numLEDs; i++)
			{
				if (phid->changedLED_Power[i] && numLeds < 4) {
					phid->LED_Power[i] = phid->nextLED_Power[i];
					phid->changedLED_Power[i] = PFALSE;
					phid->nextLED_Power[i] = PUNK_DBL;
					buf[numLeds*2] = i;
					//0-100 -> 0-63
					buf[numLeds*2+1] = (unsigned char)round((phid->LED_Power[i] / 100.0) * 63.0);
					numLeds++;
					phid->changeRequests--;
				}
			}

			//fill up any remaining buffer space with valid data - sending 0's will mess things up
			for(numLeds=numLeds;numLeds<4;numLeds++)
			{
				buf[numLeds*2] = buf[(numLeds-1)*2];
				buf[numLeds*2+1] = buf[(numLeds-1)*2+1];
			}
			break;
		case PHIDUID_LED_64_ADV:
			//control packet
			if(phid->controlPacketWaiting)
			{

				buf[0] = LED64_CONTROL_PACKET;

				buf[1] = 0;

				switch(phid->currentLimit)
				{
					case PHIDGET_LED_CURRENT_LIMIT_20mA:
						break;
					case PHIDGET_LED_CURRENT_LIMIT_40mA:
						buf[1] |= LED64_CURSELA_FLAG;
						break;
					case PHIDGET_LED_CURRENT_LIMIT_60mA:
						buf[1] |= LED64_CURSELB_FLAG;
						break;
					case PHIDGET_LED_CURRENT_LIMIT_80mA:
						buf[1] |= (LED64_CURSELA_FLAG | LED64_CURSELB_FLAG);
						break;
				}
				
				switch(phid->voltage)
				{
					case PHIDGET_LED_VOLTAGE_1_7V:
						break;
					case PHIDGET_LED_VOLTAGE_2_75V:
						buf[1] |= LED64_PWRSELA_FLAG;
						break;
					case PHIDGET_LED_VOLTAGE_3_9V:
						buf[1] |= LED64_PWRSELB_FLAG;
						break;
					case PHIDGET_LED_VOLTAGE_5_0V:
						buf[1] |= (LED64_PWRSELA_FLAG | LED64_PWRSELB_FLAG);
						break;
				}

				phid->controlPacketWaiting = PFALSE;
			}
			//LED packet
			else
			{
				int bright_packet = PFALSE;
				int output_upper = PFALSE;
				int output_lower = PFALSE;
				//decide if we need to use a normal brightness packet, or if we can use a high efficiency output packet
				for (i = 0; i < phid->phid.attr.led.numLEDs; i++)
				{
					if(phid->changedLED_Power[i])
					{
						if((phid->nextLED_Power[i] != phid->lastLED_Power[i]) && phid->nextLED_Power[i] != 0)
							bright_packet = PTRUE;
						else
						{
							if(i<32)
								output_lower = PTRUE;
							else
								output_upper = PTRUE;
						}
					}
				}

				//only sends brightness changes - not changes between 0 and a brightness
				if(bright_packet)
					{
					//construct the packet, with up to 4 LED sets
					for (i = 0; i < phid->phid.attr.led.numLEDs; i++)
					{
						if (phid->changedLED_Power[i] && numLeds < 4 && phid->nextLED_Power[i] != 0) {
							phid->LED_Power[i] = phid->nextLED_Power[i];
							phid->lastLED_Power[i] = phid->nextLED_Power[i];
							phid->changedLED_Power[i] = PFALSE;
							phid->nextLED_Power[i] = PUNK_DBL;
							buf[numLeds*2] = i;
							//0-100 -> 0-127
							buf[numLeds*2+1] = (unsigned char)round((phid->LED_Power[i] / 100.0) * 127.0);
							if(buf[numLeds*2+1])
								buf[numLeds*2+1] |= 0x80; //this turns the LED on when set brightness > 0;
							numLeds++;
							phid->changeRequests--;
						}
					}

					//fill up any remaining buffer space with valid data - sending 0's will mess things up
					//this just replicates data - doesn't send anything
					for(numLeds=numLeds;numLeds<4;numLeds++)
					{
						buf[numLeds*2] = buf[(numLeds-1)*2];
						buf[numLeds*2+1] = buf[(numLeds-1)*2+1];
					}
				}
				else
				{
					//send lower packet
					if((phid->lastOutputPacket == 0 && output_lower) || (phid->lastOutputPacket != 0 && !output_upper))
					{
						buf[0] = LED64_OUTLOW_PACKET;
						for(i = 0;i<32;i++)
						{
							if(phid->changedLED_Power[i])
							{
								phid->changeRequests--;
								phid->LED_Power[i] = phid->nextLED_Power[i];
								phid->changedLED_Power[i] = PFALSE;
								phid->nextLED_Power[i] = PUNK_DBL;
							}
							if(phid->LED_Power[i] > 0)
								buf[i/8 + 1] |= (1 << (i%8));
						}
						phid->lastOutputPacket = 1;
					}
					//send upper packet
					else
					{
						buf[0] = LED64_OUTHIGH_PACKET;
						for(i = 32;i<64;i++)
						{
							if(phid->changedLED_Power[i])
							{
								phid->changeRequests--;
								phid->LED_Power[i] = phid->nextLED_Power[i];
								phid->changedLED_Power[i] = PFALSE;
								phid->nextLED_Power[i] = PUNK_DBL;
							}
							if(phid->LED_Power[i] > 0)
								buf[i/8 - 3] |= (1 << (i%8));
						}
						phid->lastOutputPacket = 0;
					}
				}
			}
			break;
		case PHIDUID_LED_64_ADV_M3:
			//control packet
			if(phid->controlPacketWaiting)
			{
				buf[0] = LED64_M3_CONTROL_PACKET;
				
				switch(phid->voltage)
				{
					case PHIDGET_LED_VOLTAGE_1_7V:
						break;
					case PHIDGET_LED_VOLTAGE_2_75V:
						buf[0] |= LED64_PWRSELA_FLAG;
						break;
					case PHIDGET_LED_VOLTAGE_3_9V:
						buf[0] |= LED64_PWRSELB_FLAG;
						break;
					case PHIDGET_LED_VOLTAGE_5_0V:
						buf[0] |= (LED64_PWRSELA_FLAG | LED64_PWRSELB_FLAG);
						break;
				}

				for(i=0;i<64;i++)
				{
					int value;
					int bufIndex = (i*6)/8 + 1;

					//Default is 20 mA
					if(phid->LED_CurrentLimit[i] == PUNK_DBL)
						phid->LED_CurrentLimit[i] = 20;
					value = round((phid->LED_CurrentLimit[i] / LED64_M3_CURRENTLIMIT) * 63.0);

					switch(i%4)
					{
						case 0:
							buf[bufIndex] |= (value & 0x3F);
							break;
						case 1:
							buf[bufIndex] |= ((value << 6) & 0xC0);
							buf[bufIndex+1] |= ((value >> 2) & 0x0F);
							break;
						case 2:
							buf[bufIndex] |= ((value << 4) & 0xF0);
							buf[bufIndex+1] |= ((value >> 4) & 0x03);
							break;
						case 3:
							buf[bufIndex] |= ((value << 2) & 0xFC);
							break;
					}
				}

				phid->controlPacketWaiting = PFALSE;
			}
			//LED packet
			else
			{				
				int output_upper = PFALSE;
				int output_lower = PFALSE;
				int startIndex;

				for (i = 0; i < phid->phid.attr.led.numLEDs; i++)
				{
					if(phid->changedLED_Power[i])
					{
						if(i<32)
							output_lower = PTRUE;
						else
							output_upper = PTRUE;
					}
				}

				//send lower packet
				if((phid->lastOutputPacket == 0 && output_lower) || (phid->lastOutputPacket != 0 && !output_upper))
				{
					buf[0] = LED64_M3_OUT_LOW_PACKET;
					startIndex=0;
					phid->lastOutputPacket = 1;
				}
				//send upper packet
				else
				{
					buf[0] = LED64_M3_OUT_HIGH_PACKET;
					startIndex=32;
					phid->lastOutputPacket = 0;
				}

				for(i = startIndex;i<startIndex+32;i++)
				{
					int value;
					int bufIndex = ((i-startIndex)*12)/8 + 1;

					if(phid->changedLED_Power[i])
					{
						phid->changeRequests--;
						phid->LED_Power[i] = phid->nextLED_Power[i];
						phid->changedLED_Power[i] = PFALSE;
						phid->nextLED_Power[i] = PUNK_DBL;
					}

					//Default is 0 %
					if(phid->LED_Power[i] == PUNK_DBL)
						phid->LED_Power[i] = 0;
					value = round((phid->LED_Power[i] / 100.0) * 4095.0);

					if(i%2 == 0)
					{
						buf[bufIndex] |= (value & 0xFF);
						buf[bufIndex+1] |= ((value >> 8) & 0x0F);
					}
					else
					{
						buf[bufIndex] |= ((value << 4) & 0xF0);
						buf[bufIndex+1] |= ((value >> 4) & 0xFF);
					}
				}
			}
			break;
		default:
			return EPHIDGET_UNEXPECTED;
	}
	
	//if there are still pending sets, signal the event again (which will tell write thread to call this funciton again)
	if(phid->changeRequests)
		CThread_set_event(&phid->phid.writeAvailableEvent);

	*lenp = phid->phid.outputReportByteLength;

	CThread_mutex_unlock(&phid->phid.outputLock);

	return EPHIDGET_OK;
}

//sendpacket - sends a packet to the device asynchronously, blocking if the 1-packet queue is full
//	-every LED has its own 1 state mini-queue
static int CCONV CPhidgetLED_sendpacket(CPhidgetLEDHandle phid,
    unsigned int index, double power)
{
	int waitReturn;
	CThread_mutex_lock(&phid->phid.writelock);
again:
	if (!CPhidget_statusFlagIsSet(phid->phid.status, PHIDGET_ATTACHED_FLAG))
	{
		CThread_mutex_unlock(&phid->phid.writelock);
		return EPHIDGET_NOTATTACHED;
	}
	CThread_mutex_lock(&phid->phid.outputLock);
	//if we have already requested a change on this LED
	if (phid->changedLED_Power[index]) {
		//and it was different then this time
		if (phid->nextLED_Power[index] != power) {
			CThread_mutex_unlock(&phid->phid.outputLock);
			//then wait for it to get written
			waitReturn = CThread_wait_on_event(&phid->phid.writtenEvent, 2500);
			switch(waitReturn)
			{
			case WAIT_OBJECT_0:
				break;
			case WAIT_ABANDONED:
				CThread_mutex_unlock(&phid->phid.writelock);
				return EPHIDGET_UNEXPECTED;
			case WAIT_TIMEOUT:
				CThread_mutex_unlock(&phid->phid.writelock);
				return EPHIDGET_TIMEOUT;
			}
			//and try again
			goto again;
		} else {
			CThread_mutex_unlock(&phid->phid.outputLock);
			CThread_mutex_unlock(&phid->phid.writelock);
			return EPHIDGET_OK;
		}
	//otherwise
	} else {
		//if it's different then current, queue it up
		if (phid->LED_Power[index] != power) {
			phid->changeRequests++;
			phid->changedLED_Power[index] = PTRUE;
			phid->nextLED_Power[index] = power;
			CThread_reset_event(&phid->phid.writtenEvent);
			CThread_mutex_unlock(&phid->phid.outputLock);
			CThread_set_event(&phid->phid.writeAvailableEvent);
		}
		//if it's the same, just return
		else
		{
			CThread_mutex_unlock(&phid->phid.outputLock);
			CThread_mutex_unlock(&phid->phid.writelock);
			return EPHIDGET_OK;
		}
	}
	CThread_mutex_unlock(&phid->phid.writelock);
	return EPHIDGET_OK;
}

// === Exported Functions === //

//create and initialize a device structure
CCREATE(LED, PHIDCLASS_LED)

CGET(LED,LEDCount,int)
	TESTPTRS(phid,pVal) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED

	MASGN(phid.attr.led.numLEDs)
}

CGETINDEX(LED,Brightness,double)
	TESTPTRS(phid,pVal) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED
	TESTINDEX(phid.attr.led.numLEDs)
	TESTMASGN(LED_Power[Index], PUNK_DBL)

	*pVal = phid->LED_Power[Index];
	return EPHIDGET_OK;
}
CSETINDEX(LED,Brightness,double)
	TESTPTR(phid) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED
	TESTINDEX(phid.attr.led.numLEDs)
	TESTRANGE(0, 100)

	if(CPhidget_statusFlagIsSet(phid->phid.status, PHIDGET_REMOTE_FLAG))
		ADDNETWORKKEYINDEXED(Brightness, "%lf", LED_Power);
	else
		return CPhidgetLED_sendpacket(phid, Index, newVal);

	return EPHIDGET_OK;
}

CGETINDEX(LED,CurrentLimitIndexed,double)
	TESTPTRS(phid,pVal) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED
	TESTINDEX(phid.attr.led.numLEDs)

	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64_ADV_M3:
			TESTMASGN(LED_CurrentLimit[Index], PUNK_DBL)

			*pVal = phid->LED_CurrentLimit[Index];
			return EPHIDGET_OK;
		case PHIDUID_LED_64_ADV:
		case PHIDUID_LED_64:
		default:
			return EPHIDGET_UNSUPPORTED;
	}
}
CSETINDEX(LED,CurrentLimitIndexed,double)
	TESTPTR(phid) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED
	TESTINDEX(phid.attr.led.numLEDs)

	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64_ADV_M3:
			TESTRANGE(0, LED64_M3_CURRENTLIMIT)

			if(CPhidget_statusFlagIsSet(phid->phid.status, PHIDGET_REMOTE_FLAG))
				ADDNETWORKKEYINDEXED(CurrentLimitIndexed, "%lf", LED_CurrentLimit);
			else
			{
				CThread_mutex_lock(&phid->phid.writelock);
				CThread_mutex_lock(&phid->phid.outputLock);
				phid->LED_CurrentLimit[Index] = newVal;
				phid->controlPacketWaiting = PTRUE;
				CThread_mutex_unlock(&phid->phid.outputLock);
				CThread_set_event(&phid->phid.writeAvailableEvent);
				CThread_mutex_unlock(&phid->phid.writelock);
			}
			break;
		case PHIDUID_LED_64_ADV:
		case PHIDUID_LED_64:
		default:
			return EPHIDGET_UNSUPPORTED;
	}

	return EPHIDGET_OK;
}

CGET(LED,CurrentLimit,CPhidgetLED_CurrentLimit)
	TESTPTRS(phid,pVal) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED

	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64_ADV:
			MASGN(currentLimitEcho)
		case PHIDUID_LED_64_ADV_M3:
		case PHIDUID_LED_64:
		default:
			return EPHIDGET_UNSUPPORTED;
	}
}
CSET(LED,CurrentLimit,CPhidgetLED_CurrentLimit)
	TESTPTR(phid) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED

	switch(phid->phid.deviceUID)
	{
		case PHIDUID_LED_64_ADV:

			TESTRANGE(PHIDGET_LED_CURRENT_LIMIT_20mA, PHIDGET_LED_CURRENT_LIMIT_80mA)

			if(CPhidget_statusFlagIsSet(phid->phid.status, PHIDGET_REMOTE_FLAG))
				ADDNETWORKKEY(CurrentLimit, "%d", currentLimit);
			else
			{
				CThread_mutex_lock(&phid->phid.writelock);
				CThread_mutex_lock(&phid->phid.outputLock);
				phid->currentLimit = newVal;
				phid->controlPacketWaiting = PTRUE;
				CThread_mutex_unlock(&phid->phid.outputLock);
				CThread_set_event(&phid->phid.writeAvailableEvent);
				CThread_mutex_unlock(&phid->phid.writelock);
			}
			break;
		case PHIDUID_LED_64_ADV_M3:

			TESTRANGE(PHIDGET_LED_CURRENT_LIMIT_20mA, PHIDGET_LED_CURRENT_LIMIT_80mA)

			if(CPhidget_statusFlagIsSet(phid->phid.status, PHIDGET_REMOTE_FLAG))
				ADDNETWORKKEY(CurrentLimit, "%d", currentLimit);
			else
			{
				int i;
				double limit;
				switch(newVal)
				{
					case PHIDGET_LED_CURRENT_LIMIT_20mA:
						limit = 20;
						break;
					case PHIDGET_LED_CURRENT_LIMIT_40mA:
						limit = 40;
						break;
					case PHIDGET_LED_CURRENT_LIMIT_60mA:
						limit = 60;
						break;
					case PHIDGET_LED_CURRENT_LIMIT_80mA:
						limit = 80;
						break;
				}
				CThread_mutex_lock(&phid->phid.writelock);
				CThread_mutex_lock(&phid->phid.outputLock);
				for(i=0;i<phid->phid.attr.led.numLEDs;i++)
					phid->LED_CurrentLimit[i] = limit;
				phid->controlPacketWaiting = PTRUE;
				CThread_mutex_unlock(&phid->phid.outputLock);
				CThread_set_event(&phid->phid.writeAvailableEvent);
				CThread_mutex_unlock(&phid->phid.writelock);
			}
			break;
		case PHIDUID_LED_64:
		default:
			return EPHIDGET_UNSUPPORTED;
	}

	return EPHIDGET_OK;
}

CGET(LED,Voltage,CPhidgetLED_Voltage)
	TESTPTRS(phid,pVal) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED

	switch(phid->phid.deviceIDSpec)
	{
		case PHIDID_LED_64_ADV:
			MASGN(voltageEcho)
		case PHIDID_LED_64:
		default:
			return EPHIDGET_UNSUPPORTED;
	}
}
CSET(LED,Voltage,CPhidgetLED_Voltage)
	TESTPTR(phid) 
	TESTDEVICETYPE(PHIDCLASS_LED)
	TESTATTACHED

	switch(phid->phid.deviceIDSpec)
	{
		case PHIDID_LED_64_ADV:

			TESTRANGE(PHIDGET_LED_CURRENT_LIMIT_20mA, PHIDGET_LED_CURRENT_LIMIT_80mA)

			if(CPhidget_statusFlagIsSet(phid->phid.status, PHIDGET_REMOTE_FLAG))
				ADDNETWORKKEY(Voltage, "%d", voltage);
			else
			{
				CThread_mutex_lock(&phid->phid.writelock);
				CThread_mutex_lock(&phid->phid.outputLock);
				phid->voltage = newVal;
				phid->controlPacketWaiting = PTRUE;
				CThread_mutex_unlock(&phid->phid.outputLock);
				CThread_set_event(&phid->phid.writeAvailableEvent);
				CThread_mutex_unlock(&phid->phid.writelock);
			}
			break;
		case PHIDID_LED_64:
		default:
			return EPHIDGET_UNSUPPORTED;
	}

	return EPHIDGET_OK;
}

// === Deprecated Functions === //

CGET(LED,NumLEDs,int)
	return CPhidgetLED_getLEDCount(phid, pVal);
}
CGETINDEX(LED,DiscreteLED,int)
	double val;
	int ret;
	ret = CPhidgetLED_getBrightness(phid, Index, &val);
	*pVal = (int)round(val);
	return ret;
}
CSETINDEX(LED,DiscreteLED,int)
	return CPhidgetLED_setBrightness(phid, Index, (double)newVal);
}