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#1 2018-02-26 03:53:16

huuii
Contributor
Registered: 2018-02-21
Posts: 4

question about 'lf cmdread'

Hi,

I'm trying to figure out the usage of 'lf cmdread'. I used one pm3 to send a sequence and another pm3 to listen to the signal sending out, using 'lf snoop'. But I got the waveform like this whatever sequence I sent:
20180220223306.png

Learnt from http://www.proxmark.org/forum/viewtopic.php?id=5480
that the 2 second power on and the following 2 second wait period are too long for the `lf snoop` memory to hold, I followed the advice and revised the 'lf cmdread' source code.

After removing two lines of code WaitMS(2500) and WaitMS(2000) in the the source code proxmark3/armsrc/lfops.c, I retried the 'lf cmdread' and got some waveforms.
Capture1.png

This is what I got when using lf cmdread d 0 z 8 o 8 c 1111111100000000111100001100
1111111100000000111100001100.png

And this one is what we got when using lf cmdread d 0 z 8 o 8 c 11110111101100000
11110111101100000.png

Are these waveforms reasonable? And do these waveforms match the sequence I sent?
Thank you in advance.

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#2 2018-02-26 06:09:56

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: question about 'lf cmdread'

Don't double post.  It won't get answered faster.

I've removed your other hijack posting.  If anyone wants to comment on your questions they can do it here.

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#3 2018-02-26 06:20:35

huuii
Contributor
Registered: 2018-02-21
Posts: 4

Re: question about 'lf cmdread'

Okay. Sorry about that.

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