Proxmark3 community

HAMsandwich

Contributor

Registered: 2018-11-01

Posts: 8

ATA5577C Assistance

I'm new to RFID devices and I've got some questions that probably seem casually obvious to everyone else here. I've got a ATA5577C chip that I'm having issues communicating with. It initially came programmed as a EM41XX and I was able to read it repeatedly, so I attempted multiple tries of 'lf t5 wipe' and an HID clone in my "fiddling and learning PM3" phase. Problem is now I can't get any useable data out of the device and I'm not sure where to look to adjust it. 'rawdemod am' is the only mode that returns data and it's garbage:

proxmark3> data rawdemod am

Using Clock:128, Invert:0, Bits Found:312
ASK/Manchester - Clock: 128 - Decoded bitstream:
1100001100001100
0011000011000011
0000110000110000
1100001100001100
0011000011000011
0000110000110000
1100001100001100
0011000011000011
0000110000110000
1100001100001100
0011000011000011
0000110000110000
1100001100001100
0011000011000011
0000110000110000
1100001100001100
0011000011000011
0000110000110000
1100001100001100
00110000

Last edited by HAMsandwich (2018-11-02 08:31:19)

HAMsandwich

Contributor

Registered: 2018-11-01

Posts: 8

Re: ATA5577C Assistance

Oh, hw version might be useful

proxmark3> hw version
Prox/RFID mark3 RFID instrument
bootrom: master/v3.1.0-13-g6eeb5f1-dirty-suspect 2018-10-31 20:35:24
os: master/v3.1.0-13-g6eeb5f1-dirty-suspect 2018-10-31 20:35:31
fpga_lf.bit built for 2s30vq100 on 2015/03/06 at 07:38:04
fpga_hf.bit built for 2s30vq100 on 2018/09/12 at 15:18:46
SmartCard Slot: available

uC: AT91SAM7S512 Rev B
Embedded Processor: ARM7TDMI
Nonvolatile Program Memory Size: 512K bytes. Used: 193412 bytes (37%). Free: 330876 bytes (63%).
Second Nonvolatile Program Memory Size: None
Internal SRAM Size: 64K bytes
Architecture Identifier: AT91SAM7Sxx Series
Nonvolatile Program Memory Type: Embedded Flash Memory

iceman

Administrator

Registered: 2013-04-25

Posts: 9,501

Website

Re: ATA5577C Assistance

That was one ugly signal trace you got there...
Try getting a cleaner one and save it,  in order to share it here.

dat plot
lf read
data save xxx.pm3

HAMsandwich

Contributor

Registered: 2018-11-01

Posts: 8

Re: ATA5577C Assistance

That data trace is 100% repeatable minus the clipping from over-coupling with my new antenna.

Waveform in PM3 format (If anyone has a better file sharing site please point me to it)

iceman

Administrator

Registered: 2013-04-25

Posts: 9,501

Website

Re: ATA5577C Assistance

Sendspace.com ?

piwi

Contributor

Registered: 2013-06-04

Posts: 704

Re: ATA5577C Assistance

Which commands did you use to get this plot?

HAMsandwich

Contributor

Registered: 2018-11-01

Posts: 8

Re: ATA5577C Assistance

data plot
lf read
data save ~~~.pm3