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source: drsdaq/HVFeedback.cc@ 209

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Last change on this file since 209 was 196, checked in by ogrimm, 15 years ago
Fixed bug with default feedback gain from config file
File size: 11.6 KB

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1	/********************************************************************\
2
3	HVFeedback.cc
4
5	Class handling the feedback of GAPD high voltage
6
7	Oliver Grimm
8
9	\********************************************************************/
10
11	#include "HVFeedback.h"
12	#include "PixelMap.h"
13
14	#define PIXMAP_LOCATION "../config/PixelMap.txt"
15
16	static const char* FBState_Description[] = {
17	"Feedback off",
18	"Feedback active",
19	"Feedback acquiring new targets",
20	"Feedback measuring response with first voltage",
21	"Feedback measuring response with second voltage"
22	};
23
24	//
25	// Constructor: Initialise feedback
26	//
27	HVFeedback::HVFeedback(DAQReadout* DAQClass){//:
28	//EvidenceServer(SERVER_NAME){
29
30	m = DAQClass;
31
32	fNumberOfChannels = m->GetBoard(0)->GetNumberOfChannels();
33	fNumberOfChips = m->GetBoard(0)->GetNumberOfChips();
34
35	PixMap = new PixelMap(PIXMAP_LOCATION, false);
36
37	// Initialise with zero content
38	Average = new float [m->NumBoards][kNumberOfChipsMax][kNumberOfChannelsMax]();
39	Sigma = new float [m->NumBoards][kNumberOfChipsMax][kNumberOfChannelsMax]();
40	Response = new float [m->NumBoards][kNumberOfChipsMax][kNumberOfChannelsMax]();
41	Target = new float [m->NumBoards][kNumberOfChipsMax][kNumberOfChannelsMax]();
42	Buffer = new float [m->NumBoards][kNumberOfChipsMax][kNumberOfChannelsMax]();
43
44	DIMAverage = new float [m->NumBoards][kNumberOfChipsMax][kNumberOfChannelsMax]();
45	DIMSigma = new float [m->NumBoards][kNumberOfChipsMax][kNumberOfChannelsMax]();
46
47	// Get configuration data
48	fLedTrigBoard = atoi(m->GetConfig("TrigBoard"));
49	fLedTrigChannel = atoi(m->GetConfig("TrigChannel"));
50	fLedTrigChip = atoi(m->GetConfig("TrigChip"));
51	fLedTrigSample = atoi(m->GetConfig("TrigSample"));
52	fLedTrigThreshold = atoi(m->GetConfig("TrigThreshold"));
53	fLedSignalSample = atoi(m->GetConfig("SignalSample"));
54	fLedBaselineSample = atoi(m->GetConfig("BaselineSample"));
55	fIntHalfWidth = atoi(m->GetConfig("IntHalfWidth"));
56	fDefaultNumAverage = atoi(m->GetConfig("DefaultNumAverage"));
57
58	char *Token = strtok(m->GetConfig("DefaultResponse"), " \t");
59	for (int i=0; i<m->NumBoardsfNumberOfChipsfNumberOfChannels; i++) {
60	if (Token == NULL) break;
61	*(&Response[0][0][0]+i) = (float) atof(Token);
62	Token = strtok(NULL, " \t");
63	}
64	Token = strtok(m->GetConfig("DefaultTarget"), " \t");
65	for (int i=0; i<m->NumBoardsfNumberOfChipsfNumberOfChannels; i++) {
66	if (Token == NULL) break;
67	*(&Target[0][0][0]+i) = (float) atof(Token);
68	Token = strtok(NULL, " \t");
69	}
70
71	PrintConfig(MsgToLog);
72
73	// Provide DIM services
74	FeedbackAverage = new DimService (SERVER_NAME"/Average", "F", DIMAverage, m->NumBoardskNumberOfChipsMaxkNumberOfChannelsMax*sizeof(float));
75	FeedbackSigma = new DimService (SERVER_NAME"/Sigma", "F", DIMSigma, m->NumBoardskNumberOfChipsMaxkNumberOfChannelsMax*sizeof(float));
76	FeedbackResponse = new DimService (SERVER_NAME"/Response", "F", Response, m->NumBoardskNumberOfChipsMaxkNumberOfChannelsMax*sizeof(float));
77	FeedbackTarget = new DimService (SERVER_NAME"/Target", "F", Target, m->NumBoardskNumberOfChipsMaxkNumberOfChannelsMax*sizeof(float));
78	CountService = new DimService (SERVER_NAME"/Count", Count);
79
80	// Initial state
81	Gain = atof(m->GetConfig("DefaultGain"));printf("Gain %d\n", Gain);
82	SetFBMode(FB_Off);
83	SetNumAverages(fDefaultNumAverage);
84	LastServiceUpdate = 0;
85	}
86
87	//
88	// Destructor
89	//
90	HVFeedback::~HVFeedback() {
91
92	delete CountService;
93	delete FeedbackAverage;
94	delete FeedbackSigma;
95	delete FeedbackResponse;
96	delete FeedbackTarget;
97
98	delete[] Average; delete[] Response;
99	delete[] DIMAverage; delete[] DIMSigma;
100	delete[] Sigma;
101	delete[] Target; delete[] Buffer;
102	delete PixMap;
103	}
104
105	//
106	// Check if LED trigger present, if yes accumulate feedback data and
107	// calculate new high voltages if the required number of events is reached.
108	//
109	bool HVFeedback::ProcessEvent() {
110	int i,j,k,q;
111	float Correction, Integral;
112
113	// Check for LED trigger channel on given channel and if feedback running
114	if (FBMode==FB_Off \|\| m->WaveForm[fLedTrigBoard][fLedTrigChip][fLedTrigChannel][fLedTrigSample] < fLedTrigThreshold) {
115	return false;
116	}
117
118	// Calculate average signal of LED pulse as integral of signal
119	for (i=m->FirstBoard; i<=m->LastBoard; i++) {
120	for (j=0; j<fNumberOfChips; j++) {
121	for (k=0; k<fNumberOfChannels; k++) {
122	for (Integral=0, q=-fIntHalfWidth; q<=(int) fIntHalfWidth; q++) {
123	Integral += (m->WaveForm[i][j][k][fLedSignalSample+q] - m->WaveForm[i][j][k][fLedBaselineSample+q])*m->GetBoard(i)->GetPrecision();
124	}
125	Integral /= 2*fIntHalfWidth+1;
126	Average[i][j][k] += Integral;
127	Sigma[i][j][k] += pow(Integral,2);
128	}
129	}
130	}
131
132	// Update DIM service regularly
133	if (time(NULL)-LastServiceUpdate > 2) {
134	LastServiceUpdate = time(NULL);
135	CountService->updateService();
136	}
137	// Check if acquired number of event requires action
138	if (++Count<NumAverages) return false;
139
140	// Feedback action
141	for (i=m->FirstBoard; i<=m->LastBoard; i++) {
142	for (j=0; j<fNumberOfChips; j++) {
143	for (k=0; k<fNumberOfChannels; k++) {
144	// Calculate average
145	Average[i][j][k] /= Count;
146	Sigma[i][j][k] = sqrt(Sigma[i][j][k]/Count-pow(Average[i][j][k],2))/sqrt(Count);
147	DIMAverage[i][j][k] = Average[i][j][k];
148	DIMSigma[i][j][k] = Sigma[i][j][k];
149
150	switch (FBMode) {
151	case FB_Active: // Determine correction from response maxtrix and change voltages
152	Correction = -(Target[i][j][k] - Average[i][j][k])Response[i][j][k]Gain;
153	if (fabs(Correction) > 0.1) Correction = fabs(Correction)/Correction*0.1; // Limit changes to 100 mV
154	if(Correction==0 \|\| Target[i][j][k]==0 \|\| PixMap->DRS_to_Pixel(i,j,k).empty()) break;
155	printf("Average of board %d, chip %d, channel %d is %.2f +/- %.2f Correction %.3f\n",i,j,k,Average[i][j][k],Sigma[i][j][k],Correction);
156
157	if(fabs(Average[i][j][k]) < 2*Sigma[i][j][k]) printf("Too noisy!\n");
158	else WriteHVCommand("hv %s %+f\n",PixMap->DRS_to_Pixel(i,j,k).c_str(), Correction);
159
160	break;
161
162	case FB_Targets: // Take average as new targets
163	Target[i][j][k] = Average[i][j][k];
164	break;
165
166	case FB_ResponseFirst: // First point of response measurement done
167	Buffer[i][j][k] = Average[i][j][k];
168	if(!PixMap->DRS_to_Pixel(i,j,k).empty()) WriteHVCommand("hv %s %+f",PixMap->DRS_to_Pixel(i,j,k).c_str(), DiffVoltage);
169	break;
170
171	case FB_ResponseSecond: // Determine response from signal variation
172	if(Buffer[i][j][k] == Average[i][j][k]) {
173	m->PrintMessage("HV Feedback: Warning, response singular for board %d, chip %d, channel %d.\n",i,j,k);
174	Response[i][j][k] = 0;
175	}
176	else Response[i][j][k] = DiffVoltage/(Buffer[i][j][k]-Average[i][j][k]);
177	if(!PixMap->DRS_to_Pixel(i,j,k).empty()) WriteHVCommand("hv %s %+f",PixMap->DRS_to_Pixel(i,j,k).c_str(), -DiffVoltage/2);
178	break;
179
180	default: break; // to suppress warning abount not handled enumeration value
181	}
182	} // for() channels
183	} // for() chips
184	} // for() boards
185
186	// Update DIM service
187	FeedbackAverage->updateService();
188	FeedbackSigma->updateService();
189
190	switch (FBMode) {
191	case FB_Targets:
192	FeedbackTarget->updateService();
193	m->PrintMessage("HV Feedback: New targets set, switching off.\n");
194	SetFBMode(FB_Off, true);
195	break;
196	case FB_ResponseFirst:
197	SetFBMode(FB_ResponseSecond, true);
198	m->PrintMessage("HV Feedback: Increasing voltages by %f for response measurement, acquiring data.\n", DiffVoltage);
199	break;
200	case FB_ResponseSecond:
201	FeedbackResponse->updateService();
202	m->PrintMessage("HV Feedback: Response measurements finished, original voltages set, switching off.\n");
203	SetFBMode(FB_Off, true);
204	break;
205	default: break; // to suppress warning abount not handled enumeration value
206	}
207	ClearAverages();
208
209	return true;
210	}
211
212	//
213	// Clear average values and event counter
214	//
215	void HVFeedback::ClearAverages() {
216	for (int i=m->FirstBoard; i<=m->LastBoard; i++)
217	for (int j=0; j<fNumberOfChips; j++)
218	for (int k=0; k<fNumberOfChannels; k++) {
219	Average[i][j][k] = 0.0;
220	Sigma[i][j][k] = 0.0;
221	}
222	Count = 0;
223	CountService->updateService();
224	}
225
226	//
227	// Number of events to accumulate before correction acts
228	//
229	void HVFeedback::SetNumAverages(unsigned int Averages) {
230	NumAverages = Averages;
231	}
232
233	//
234	// Get requested number of events
235	//
236	unsigned int HVFeedback::GetNumAverages() {
237	return NumAverages;
238	}
239
240	//
241	// Set feedback gain
242	//
243	void HVFeedback::SetGain(float FBGain) {
244	Gain = FBGain;
245	}
246
247	//
248	// Get feedback gain
249	//
250	float HVFeedback::GetGain() {
251	return Gain;
252	}
253
254	//
255	// Set feedback mode and clear averages
256	//
257	void HVFeedback::SetFBMode(FBState Mode, bool Internal) {
258	if((Mode==FB_ResponseFirst \|\| Mode==FB_ResponseFirst) && !Internal)
259	m->PrintMessage("Start reponse measurement by calling MeasureResponse().\n");
260	else {
261	FBMode = Mode;
262	if (Mode != FB_ResponseFirst) m->State(m->INFO, "%s", FBState_Description[FBMode]);
263	else m->State(m->INFO, "%s (voltage difference %.3f)", FBState_Description[FBMode], DiffVoltage);
264	ClearAverages();
265	}
266	}
267
268	//
269	// Get feedback mode
270	//
271	FBState HVFeedback::GetFBMode() {
272
273	m->PrintMessage("%s.\n", FBState_Description[FBMode]);
274	return FBMode;
275	}
276
277	//
278	// Return current number of events
279	//
280	unsigned int HVFeedback::GetCurrentCount() {
281	return Count;
282	}
283
284	//
285	// Set target values
286	//
287	void HVFeedback::SetTarget(int Board, int Chip, int Channel, float TargetVal) {
288
289	if(Board<m->NumBoards && Chip<fNumberOfChips && Channel<fNumberOfChannels) {
290	Target[Board][Chip][Channel] = TargetVal;
291	FeedbackTarget->updateService();
292	}
293	else printf("Invalid board, chip or channel number.\n");
294	}
295
296	//
297	// Print target values
298	//
299	void HVFeedback::GetTargets() {
300	for (int i=m->FirstBoard; i<=m->LastBoard; i++)
301	for (int j=0; j<fNumberOfChips; j++) {
302	m->PrintMessage("Board %d, chip %d:",i,j);
303	for (int k=0; k<fNumberOfChannels; k++) m->PrintMessage(" %.2f",Target[i][j][k]);
304	m->PrintMessage("\n\r");
305	}
306	}
307
308	//
309	// Measure response matrix
310	//
311	void HVFeedback::MeasureResponse(float U) {
312
313	if (U==0) {
314	m->PrintMessage("HV Feedback: Error, voltage difference must not non-zero.\n");
315	return;
316	}
317
318	for (int i=m->FirstBoard; i<=m->LastBoard; i++)
319	for (int j=0; j<fNumberOfChips; j++)
320	for (int k=0; k<fNumberOfChannels; k++) {
321	if(!PixMap->DRS_to_Pixel(i,j,k).empty()) {
322	WriteHVCommand("hv %s %+f\n",PixMap->DRS_to_Pixel(i,j,k).c_str(), -U/2);
323	}
324	}
325	DiffVoltage = U;
326	SetFBMode(FB_ResponseFirst, true);
327	m->PrintMessage("HV Feedback: Decreasing voltages by %f for response measurement, acquiring data.\n",DiffVoltage/2);
328	}
329
330	//
331	// Print response values
332	//
333	void HVFeedback::GetResponse() {
334	for (int i=m->FirstBoard; i<=m->LastBoard; i++) {
335	for (int j=0; j<fNumberOfChips; j++) {
336	m->PrintMessage("Board %d, chip %d:",i,j);
337	for (int k=0; k<fNumberOfChannels; k++) m->PrintMessage(" %.3f",Response[i][j][k]);
338	m->PrintMessage("\n\r");
339	}
340	}
341	}
342
343	//
344	// Write bias voltage commmand
345	//
346	bool HVFeedback::WriteHVCommand(const char *Format, ...) {
347
348	char Textbuffer[MAX_COM_SIZE];
349
350	va_list ArgumentPointer; va_start(ArgumentPointer, Format);
351	vsnprintf(Textbuffer, sizeof(Textbuffer), Format, ArgumentPointer);
352
353	DimClient::sendCommand("Bias/Command", Textbuffer);
354	return true;
355	}
356
357	//
358	// Print feedback configuration
359	//
360	void HVFeedback::PrintConfig(int Target) {
361
362	m->PrintMessage(Target, "LedTrigBoard: %d\t\tLedTrigChip: %d\t\tLedTrigChannel: %d\n"
363	"LedTrigSample: %d\tLedTrigThreshold: %.2f\n"
364	"LedSignalSample: %d\tLedBaselineSample: %d\tDefaultNumAverage: %d\n"
365	"IntHalfWidth:%u\n",
366	fLedTrigBoard, fLedTrigChip, fLedTrigChannel, fLedTrigSample,
367	fLedTrigThreshold, fLedSignalSample, fLedBaselineSample,
368	fDefaultNumAverage, fIntHalfWidth);
369	}

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