1 Introduction

This section provides know-how procedures the HARPO team share.

2 Data format

There is one output file by instance of clientUPD (by card).

outputFile  = fileHeader event{nb-events}
event       = eventHeader areqPaquet{nb-asics}
eventHeader = eventSize eventNumber                               [        8 bytes]
areqPacket  = dccPacket{nb-channels}
dccPacket   = payloadSize dccHeader fem data{nb-capas} trailer    [     1044 bytes]
fem         = femHeader args timeH timeL event wordCount          [       16 bytes]
trailer     = align{?} trailerH trailerL                          [        4 bytes]

fileHeader  = RYYYY.MM.DD-HH:MM                                   [       20 bytes]

eventSize   = 4 bytes (see computation above)
eventNumber = 4 bytes

payloadSize = 2 bytes (usually 0x0414 = 1044)
dccHeader   = 2 bytes (usually 0x4000, seen at 0x5000)

femHeader   = 2 bytes (from 0x0000 to 0x000f)
args        = 2 bytes (from 0x0012 to 0x01D4 by step of 6: 2,8,e,4,a,0,6,c) 
timeH       = 2 bytes
timeL       = 2 bytes
event       = 2 bytes 
wordCount   = 2 bytes (usually 0x0200 = 512: same as nb-capas I guess)

data        = 2 bytes

align       = 2 bytes (0x0000)
trailerH    = 2 bytes (0x0000)
trailerL    = 2 bytes (0x0000)

exemple:
00000000: 5232 3031 312e 3130 2e31 332d 3133 3a33  R2011.10.13-13:3
00000010: 363a 3437-0004 d7c8 0000 0001-0414 4000  6:47..........@.
00000020: 000d 0012 0003 f092 c95d 0200-0159 0147  .........]...Y.G
...
00000420: 014a 0148 014a 014b 0150 010a-0000 0000- .J.H.J.K.P......
00000430: 0414 4000 000e 0018 0003 f092 c95d 0200  ..@..........]..
00000440: 0139 011d 011a 010f 0116 0117 011d 011a  .9..............

We can compute nb-capas looking at the upper exemple:
0x42c - 0x2c = 0x400 => 512 words of data
dccPacket size should be:
sizeOf(dccPacket) = 16 + (nb-capas * 2) + (4 or 5)
note: maybe sometime one «align» 0x0000 word is added. In fact even if we have 3 consecutives 0x0000 words, the dccPacket size do not looks to change so I guess the last capa value is in fact 0x0000 (but strange).
areqPacket size should be:
sizeOf(areqPacket) = sizeOf(dccPacket) * nb-channels
event size should be:
sizeOf(event) = 8 + (sizeOf(areqPacket) * nb-asics)
Global file size should be:
sizeOf(outputFile) = 20 + (sizeOf(event) * nb-events)

3 bgLink bug

These 2 files show the following error, resulting in a dccPacket lost:

------------------------------------
dcc(00): Warning: cmd(27) areq 0 0 0 3 78
 failed: -4 Fem(0): Fem_ReceiveData failed

dcc(00).rep(27): -4 Fem(0): Fem_ReceiveData failed
dcc(00).rep(27.4): 1044 bytes of data (expecting 71 more packets)
------------------------------------

file YB_10C.DAT

0004d7d0:                              [0004 d7c8  .......!........
0004d7e0: 0000 0002 0414 4000 0006 0012 005c 0f61  ......@......\.a
...
0004e000: 0118 011f 0111 0109 0000 0000 0414 4000  ..............@.
0004e010: 0008(001e)005c 0f61 c95e 0200 0134 011f  .....\.a.^...4..
...
0004e420: 0414 4000 0009(0024)005c 0f61 c95e 0200  ..@....$.\.a.^..
...
0009afa0: 0000 0000]0004 d7c8 0000 0003 0414 4000  ..............@.
0009afb0: 0001 0012 00b3 c8de c95f 0200 015b 0146  ........._...[.F

Size of loop on args from 0x0012 to 0x0012 on event 2 is:
0x0009afa4 - 0x0004d7dc = 0x4D7C8 => 317384

This seems correct (nb-capas=512, nb-channels=76 and nb-asics=4) but only if we do not have align word in the files (in fact we should have last values at 0x0000 but this is strange):
```
    1044   <= sizeOf(dccPacket)   <= 1045 
    79344  <= sizeOf(areqPacket) <= 79420
    317384 <= sizeOf(event)      <= 317688
```

file YB_10B.DAT

0004d7d0:                              [0004 d3b4  .......#........
0004d7e0: 0000 0002 0414 4000 0006 0012 0062 d225  ......@......b.%
...
0004e000: 011f 0117 0123 010c 0000 0000 0414 4000  .....#........@.
0004e010: 0008(001e)0062 d225 c954 0200 0137 011e  .....b.%.T...7..
...
0004e420: 0414 4000 000a(002a)0062 d225 c954 0200  ..@....*.b.%.T..
...
0009ab90:]0004 d7c8 0000 0003 0414 4000 0000 0012  ..........@.....

At 0x0004e420: We jump from args 0x001e to 0x002a while we expected to jump to 0x0024.
Size of loop on args from 0x0012 to 0x0012 on event 2 is: 0x0009ab90 - 0x0004d7dc = 0x4D3B4 => 316340 (we miss exacly 1044 with above)

4 Client code

Code is here: harpo@llrharpo: /Partage/harpo/trunk/design/informatique/ClientLLR

The makefile is here: ClientLLR/linux/makefile :

ClientLLR/client/clientUDP.c
ClientLLR/gblink/gblink.c : maccro for data packet
ClientLLR/util/histo.c : histogram object
ClientLLR/dcc/pedestal_packet.c : pedestal packet
ClientLLR/dcc/ethpacket.c : DCC -> pc
ClientLLR/dcc/endofevent_packet.c : end of event packet

File included:

#include <stdio.h>
#include <time.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stropts.h> // stream interface
#include <string.h>
#include <errno.h>
#include <sched.h>
#include <math.h>

#include "platforms/linux/platform_spec.h" (nothing special)

#include "util/linux/sock_util.h" 
#include "util/timerlib.h"
#include "util/histo.h"

#include "gblink/gblink.h"
#include "gblink/linux/gblink_ps.h"

#include "fem/after.h"
#include "fem/fem.h"
#include "fem/err_codes.h"
#include "fem/fem_reg.h"
#include "fem/fem_mapping.h"
#include "fem/fem_t2k_map.h"

#include "dcc/dcc.h"
#include "dcc/ethpacket.h"
#include "dcc/endofevent_packet.h"
#include "dcc/busymeter.h"
#include "dcc/pedestal_packet.h"
#include "dcc/bufpool_err.h"

#include "client/midasformat.h"

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2015-10-29

Contents

1 Introduction

2 Data format

3 bgLink bug

4 Client code