• Registered: 2009-09-05
  • Posts: 6

Topic: blew circular buffer! What is the problem?

What is the problem? Who is to blame? Antenna or a special protection?

> tune
# LF antenna @   0 mA /   134 mV [1273 ohms] 125Khz
# LF antenna @   0 mA /   134 mV [1187 ohms] 134Khz
# HF antenna @  50 mA / 11762 mV [235 ohms] 13.56Mhz

That has always been:

recorded activity:
 ETU     :rssi: who bytes
---------+----+----+-----------
 +      0:    :     26    
 + 322054:    :     26    
 + 321200:    :     26    
 +     64:   0: TAG 04  00    
 +   7656:    :     93  20    
 +     64:   0: TAG 8b  80  4e  6b  2e    
 +  10647:    :     93  70  8b  80  4e  6b  2e  a7  66    
 +     64:   0: TAG 08  b6  dd    
 +  43569:    :     60  00  f5  7b    
 +    112:   0: TAG c3  c9  c5  2c    
 +  10344:    :     2f  73  7b  5b  84  19  62  9b      !crc
 +     64:   0: TAG af  c5  8d  60!   
 +  12390:    :     ee  e0  0a  53      !crc
 +     64:   0: TAG 02    
 +   3704:    :     1c  a2  73  35  e9  a9  f0  19  4a  88  d9  a7  bc  1d  25  00  5b  f5      !crc
 +   2630:   0: TAG 0c!   
 +  19175:    :     7f  88  fd  cf      !crc
 +    112:   0: TAG 9d! ff! 31  5d    
 +  10799:    :     c5  18  ae  88  0c  23  ba  05      !crc
 +     64:   0: TAG 11!   
 +    128:   0: TAG 52! 08  01    
 +  11614:    :     26  0b  8d  f6      !crc
 +     64:   0: TAG 04    
 +   3752:    :     5d  63  6b  60  8d  b1  bb  27  cc  f3  f3  8c  04  fa  c6  70  8f  19      !crc
 +   2631:   0: TAG 08    
 +  18989:    :     25  03  ee  0e      !crc
        ......................................
 +   2631:   0: TAG 0c!   
 +  19046:    :     23  02  2e  4f      !crc
 +    112:   0: TAG 59! 41  58  43!   
 +  10295:    :     29  3d  0c  a7  3d  97  66  a4      !crc
 +     63:   0: TAG be!   
 +  12342:    :     24  28  43  24      !crc
 +     64:   0: TAG 07

And like this elsewhere(He made three attempts hi14asnoop):

First attempt:

>> Started prox, built Jul 13 2009 01:21:29
>> Connected to device
> hi14asnoop
#db# blew circular buffer!
#db# 00000191, 00000003, 00000004

#db# 00000020, 00000473, 00000093

> hi14alist
recorded activity:
 ETU     :rssi: who bytes
---------+----+----+-----------
 +      0:    :     26    
 +   3440:    :     26    
 +   3431:    :     26    
 +   2536:    :     26    
 +   2296:    :     26    
   
       ..............
+    488:    :     26    
 +   1263:    :     26    
 +    720:    :     93  20    
 +   1504:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    864:    :     26    
 +   1216:    :     26    
 +   1304:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     26    
 +   1303:    :     26    
 +   1384:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    728:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     60  08  bd  f7    
 +   1168:    :     20  d6  72  d9  08  41  41  ed      !crc
 +    926:    :     7e  7d  e7  1e      !crc
 +   2088:    :     61  ce  14  df      !crc
 +   2024:    :     26    
 +   1232:    :     26

Second attempt:

> hi14asnoop
#db# blew circular buffer!
#db# 00000191, 00000002, 00000002

#db# 00000020, 00000347, 00000093

> hi14alist
recorded activity:
 ETU     :rssi: who bytes
---------+----+----+-----------
 +      0:    :     26    
 +   3424:    :     26    
 +   2296:    :     26    
 +   1144:    :     26    
    ..........................
+   1136:    :     26    
 +   1152:    :     26    
 +    122:   0: TAG 03!   
 +     42:   0: TAG 01    
 +    396:    :     26    
 +   1152:    :     26    
 +    122:   0: TAG 07    
 +     50:   0: TAG 01    
 +    380:    :     26    
 +   1286:    :     26    
 +    504:    :     26    
 +   1152:    :     26    
 +    131:   0: TAG ff!   
 +    277:    :     26    
 +   1152:    :     26    
 +    440:    :     26    
 +   1136:    :     26    
 +    456:    :     26    
 +   1144:    :     26    
 +    672:    :     93  20    
 +    130:   0: TAG 04    
 +     80:   0: TAG 80    
 +   1262:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    864:    :     26    
 +   1216:    :     26    
 +   1288:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    132:   0: TAG 01    
 +     40:   0: TAG 03!   
 +    916:    :     26    
 +   1280:    :     26    
 +   1391:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    744:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     60  08  bd  f7    
 +   1176:    :     89  e8  e3  01  5d  29  fe  87      !crc
 +    928:    :     f8  17  02  10      !crc
 +    188:   0: TAG 01    
 +   1899:    :     8b  e6  e6  dd      !crc
 +   2024:    :     26    
 +   1224:    :     26

Third attempt

> hi14asnoop
#db# blew circular buffer!
#db# 00000191, 00000000, 00000000

#db# 00000020, 0000019e, 00000055

> hi14alist
recorded activity:
 ETU     :rssi: who bytes
---------+----+----+-----------
 +      0:   0: TAG 02    
 +   5200:   0: TAG 00!   
 +     92:   0: TAG 00!   
 +  17854:   0: TAG 00!   
 +     44:   0: TAG 00!   
 +  11452:   0: TAG 04    
 +   1760:   0: TAG 04  00    
 +    680:   0: TAG 71  19  7f  ba  ad    
 +   1480:   0: TAG 88  be  59    
 +   2080:   0: TAG 04  00    
 +   1304:   0: TAG 88  be  59    
 +   2424:   0: TAG 04  00    
 +   1392:   0: TAG 88  be  59    
 +   1880:   0: TAG 04  00    
 +   1200:   0: TAG 88  be  59    
 +   1168:   0: TAG 04  af  5d  9c    
 +   1136:   0: TAG f7  f6! 96! 4d    
 +    936:   0: TAG b9! f8! 2b! 32  05! fc! 51  b8  db! 16! 37  22  b5! bb! aa  eb  9b! a1!     !crc
 +   2087:   0: TAG 66! 6d! 65  57! 36! 78! 95  0f  6d  a2  d6! 3b! eb  1b! b2! f6  99! 94!     !crc
 +   3248:   0: TAG 04  00    
 +   1304:   0: TAG 88  be  59    
 +   2416:   0: TAG 04  00    
 +   1400:   0: TAG 88  be  59    
 +   1879:   0: TAG 04  00    
 +   1208:   0: TAG 88  be  59    
 +   1160:   0: TAG eb  f1  23  6c    
 +   1128:   0: TAG fb  ff  1c  01    
 +    936:   0: TAG 4c! ad  74! d0  00    
 +    480:   0: TAG f3! 0c  be  f3! 50  a3  c0  bf  ae! 20! d7! 03!     !crc
 +   1600:   0: TAG 2a! ef! fd! a9  ab  f8! 19! 1d! e0! 1f! f5  75  8c! f3! a4! 65  1b  26!     !crc
 +   3248:   0: TAG 04  00
  • From: Between a REQB and a ATQB
  • Registered: 2009-03-04
  • Posts: 60

Re: blew circular buffer! What is the problem?

What is the firmware version?

  • Registered: 2008-08-19
  • Posts: 291

Re: blew circular buffer! What is the problem?

It seems you're not getting a good read of the card, try different orientation of the card relative to the antenna.

  • Registered: 2009-09-05
  • Posts: 6

Re: blew circular buffer! What is the problem?

d18c7db wrote:

It seems you're not getting a good read of the card, try different orientation of the card relative to the antenna.

I need to remake a new antenna?

rleroy wrote:

What is the firmware version?

pm3-20090713-r52

  • From: Between a REQB and a ATQB
  • Registered: 2009-03-04
  • Posts: 60

Re: blew circular buffer! What is the problem?

I know that either samy or edo512, if I recall correctly has made some improvements to the buffler handling routines in newer firmware revisions specifically to handle this 14443A blew circular buffer problems so you might have to upgrade to a new firmware ...

Last edited by rleroy (2009-09-26 20:57:38)

  • Registered: 2009-09-05
  • Posts: 6

Re: blew circular buffer! What is the problem?

rleroy wrote:

I know that either samy or edo512, if I recall correctly has made some improvements to the buffler handling routines in newer firmware revisions specifically to handle this 14443A blew circular buffer problems so you might have to upgrade to a new firmware ...

Where it is possible to download this insertion? Now I test the version - pm3-20090905-r216

> version
#db# Prox/RFID mark3 RFID instrument
#db# bootrom: svn 215 2009-09-05 14:10:58
#db# os: svn 215 2009-09-05 14:10:59
#db# FPGA image built on 2009/ 8/28 at 23:49:10

# LF antenna:  0.00 V @   125.00 kHz
# LF antenna:  0.13 V @   134.00 kHz
# LF optimal:  0.00 V @ 12000.00 kHz
# HF antenna: 11.99 V @    13.56 MHz
# Your LF antenna is unusable.
  • roel
  • Administrator
  • Offline
  • Registered: 2008-05-21
  • Posts: 246

Re: blew circular buffer! What is the problem?

There are two posts in the FAQ about this, check it out here and here.

blew circular buffer means that the microprocessor (ARM) could not catch up with the FPGA for parsing the incoming bits. On a clean trace (with a good antenna), this would most likely never occur, but when the antenna is receiving to much noise it could happen wink

  • Registered: 2009-09-05
  • Posts: 6

Re: blew circular buffer! What is the problem?

roel wrote:

There are two posts in the FAQ about this, check it out here and here.

blew circular buffer means that the microprocessor (ARM) could not catch up with the FPGA for parsing the incoming bits. On a clean trace (with a good antenna), this would most likely never occur, but when the antenna is receiving to much noise it could happen wink

In what ways it is possible to protect antenna from superfluous noise? What ways are?

Last edited by tarantul (2009-09-28 12:09:53)

  • roel
  • Administrator
  • Offline
  • Registered: 2008-05-21
  • Posts: 246

Re: blew circular buffer! What is the problem?

When the antenna receives a partial transmission it could recognize SOF/EOF (start/end of frame) bits that are not correct. It means that the microprocessor code takes to long to process the incoming bits. If you add a delay to the parsing routine, or you start feed the arm random bit sequences, I guess you can simulate this behavior.

  • Registered: 2009-09-05
  • Posts: 6

Re: blew circular buffer! What is the problem?

Today has made the test in the same place with an insertion pm3-20090905-r216. Errors blew circular buffer! This time was not. It seems to me it has not turned out to grasp the sufficient information for crapto1. Or I am mistaken. Please help me to understand.

#db# COMMAND FINISHED
#db# 0000004d, 00000000, 00000001

#db# 00000020, 00000bc2, 00000026

#db# 0000004d, 00000000, 00000001

#db# 00000020, 00000bc2, 00000026

> hi14alist
recorded activity:
 ETU     :rssi: who bytes
---------+----+----+-----------
 +      0:    :     26    
 +   1144:    :     26    
 +    416:    :     26    
 +   1144:    :     26    
 +    456:    :     26    
 +   1144:    :     26    
 +    600:    :     26    
 +   1136:    :     26    
 +    576:    :     26    
 +   1144:    :     26    
 +    672:    :     93  20    
 +   1472:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    863:    :     26    
 +   1216:    :     26    
 +   1288:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1088:    :     26    
 +   1272:    :     26    
 +   1392:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    744:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     60  08  bd  f7    
 +   2102:    :     be  01  f0  cb      !crc
 +   2088:    :     96  bf  75  8e      !crc
 +   2024:    :     26    
 +   1224:    :     26    
 +   1304:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     26    
 +   1304:    :     26    
 +   1392:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    736:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     60  09  34  e6    
 +    156:   0: TAG 01    
 +     56:   0: TAG 01    
 +    972:    :     ff  3e  00  4e  ee  9e  af  f3      !crc
 +    116:   0: TAG 07    
 +    160:   0: TAG 0f!   
 +    660:    :     5a  90  67  17      !crc
 +    196:   0: TAG 01    
 +     76:   0: TAG 01    
 +    256:   0: TAG 00!   
 +    268:   0: TAG 01    
 +    168:   0: TAG 01    
 +    292:   0: TAG 03!   
 +    832:    :     8a  49  51  98      !crc
 +    456:   0: TAG 00!   
 +    294:   0: TAG 00! 7b  77! 02    
 +    262:   0: TAG 03!   
 +    216:   0: TAG 03!   
 +    796:    :     26    
 +   2551:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     26    
 +   1288:    :     26    
 +   1400:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    736:    :     26    
 +   1144:    :     26    
 +   1208:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1112:    :     60  0a  af  d4    
 +   1176:    :     32  77  9f  8c  29  5f  56  ad      !crc
 +   3007:    :     40  17  4e  ef      !crc
 +   2032:    :     26    
 +   1232:    :     26    
 +   1296:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     26    
 +   1312:    :     26    
 +   1400:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    728:    :     26    
 +   1150:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1112:    :     60  0c  99  b1    
 +   1168:    :     fd  5b  56  fc  50  a7  c0  51      !crc
 +    944:    :     78  7f  1c  bc      !crc
 +   2080:    :     4e  b4  8d  9b      !crc
 +   2032:    :     26    
 +   1208:    :     26    
 +   1296:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    114:   0: TAG 01    
 +    974:    :     26    
 +   1288:    :     26    
 +   1400:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    744:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     60  0d  10  a0    
 +   1176:    :     2d  78  1c  be  79  57  c5  23      !crc
 +    936:    :     cc  9f  3a  4c      !crc
 +   2087:    :     48  44  b5  2a      !crc
 +   2032:    :     26    
 +   1216:    :     26    
 +   1304:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1088:    :     26    
 +   1280:    :     26    
 +   1392:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    752:    :     26    
 +   1144:    :     26    
 +   2319:    :     60  0e  8b  92    
 +   1176:    :     02  11  08  33  21  3f  56  8b      !crc
 +    928:    :     53  b4  14  fa      !crc
 +   2088:    :     9f  b4  b4  45      !crc
 +   2024:    :     26    
 +   1232:    :     26    
 +   1320:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1120:    :     26    
 +   1278:    :     26    
 +   1392:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    736:    :     26    
 +   1144:    :     26    
 +   1208:    :     93  70  71  19  7f  ba  ad  07  8e    
 +   1208:    :     60  08  bd  f7    
 +    154:   0: TAG 46    
 +   1030:    :     57  bd  3e  ba  5a  24  1d  88      !crc
 +   5576:    :     26    
 +   1240:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    172:   0: TAG 03!   
 +    732:    :     26    
 +   1152:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    688:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    172:   0: TAG 03!   
 +    748:    :     26    
 +   1144:    :     26    
 +   1887:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    904:    :     26    
 +   1152:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    696:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    920:    :     26    
 +   1144:    :     26    
 +   1895:    :     26    
 +   1152:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    904:    :     26    
 +   1152:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    704:    :     26    
 +   1144:    :     26    
 +   1208:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    912:    :     26    
 +   3038:    :     26    
 +   1152:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    912:    :     26    
 +   1144:    :     26    
 +   1200:    :     93  70  71  19  7f  ba  ad  07  8e    
 +    696:    :     26    
 +   1144:    :     26
  • Registered: 2010-04-19
  • Posts: 4

Re: blew circular buffer! What is the problem?

I have the HF antenna bought on http://www.proxmark3.com/ PunBB bbcode test

My snoop is out of order, It worked previously, but not now and i don't know why.
When I run the snoop, immediatly after it display "blew circular buffer! " even if the antenna is in the air. (not between the card and the reader)

I tryed many version of osimage/fpgaimage/bootromimage available on the svn (218, 338, 442, and the last) but the problem is the same.


See below 2 examples where my antenna is in the air (not between the card and the reader)

proxmark3> hw tune
#db# Measuring antenna characteristics, please wait.
proxmark3>

# LF antenna:  0.00 V @   125.00 kHz
# LF antenna:  0.00 V @   134.00 kHz
# LF optimal:  0.00 V @ 12000.00 kHz
# HF antenna:  5.80 V @    13.56 MHz
# Your LF antenna is unusable.
proxmark3> hf 14a snoop
#db# blew circular buffer!
#db# 191 0 0
#db# 20 0 0

with the other position of the switch of the antenna

proxmark3> hw tune
#db# Measuring antenna characteristics, please wait.
proxmark3>

# LF antenna:  0.00 V @   125.00 kHz
# LF antenna:  0.00 V @   134.00 kHz
# LF optimal:  0.00 V @ 12000.00 kHz
# HF antenna:  9.05 V @    13.56 MHz
# Your LF antenna is unusable.
proxmark3> hf 14a snoop
#db# blew circular buffer!
#db# 191 0 0
#db# 20 0 0
proxmark3>

It's append the same with the antenna between the reader and the card, but sometimes if i'm lucky i can "hf 14a list"  2 ou 3 commands of the reader. The rest of the time, there is any communications recorded.


Does anyone have an idea ?

Last edited by MisterB (2010-06-17 14:15:31)

  • Registered: 2008-11-28
  • Posts: 48

Re: blew circular buffer! What is the problem?

The switch should be left in the position yielding 9V. This is the expected voltage for a 47pF HF circuit.

Buy a Proxmark

proxcat's Website

  • Registered: 2010-04-19
  • Posts: 4

Re: blew circular buffer! What is the problem?

Thanks but it doesn't fix my problem.