> I think this is a great goal, but have you considered using GNU Radio > to confirm that it works and then rewrite it in C/C++ piece by piece?
Yep but in that case would be copying, not understanding, wouldn't it? :D > Have you looked at the waveform to see if you can identify where the > data is being transmitted? Yep, I'm on the right frequency and it's clearly ASK. > I think you're on the right track. Great! :D > It probably depends on what is being transferred. A good place to > start would be these specs: > http://members.nfc-forum.org/specs/spec_list/ Thanks so much :) 2015-04-17 21:48 GMT+03:00 Dominic Spill <domini...@gmail.com>: > On 17 April 2015 at 15:25, evilsocket <evilsoc...@gmail.com> wrote: > > Hi everyone, I'm trying to decode NFC-A ( 13.56Mhz ) data from the HackRF > > using C/C++ code instead of GNU Radio, mostly because I want to > understand > > the logic of demodulation and decoding itself instead of using pre made > > tools. > > I think this is a great goal, but have you considered using GNU Radio > to confirm that it works and then rewrite it in C/C++ piece by piece? > > > As far as I read on the web, NFC uses ASK modulation, so what I'm > currently > > doing on the rx callback is taking each IQ, computing amplitude, > > thresholding it to get a 1 or 0 bit, appending each bit to a bit stream > and > > print the hex value every 8 bits, you can see the code here: > > Have you looked at the waveform to see if you can identify where the > data is being transmitted? > > > I have two questions: > > > > 1. Am I on the right track or am I doing everything wrong? :) > > I think you're on the right track. > > > 2. If what I'm doing is correct, could someone point me to the right > > documentation on how to decode those hex streams I get? > > It probably depends on what is being transferred. A good place to > start would be these specs: > http://members.nfc-forum.org/specs/spec_list/ > -- _________________________ Simone '*evilsocket*' Margaritelli http://www.evilsocket.net/ <http://www.evilsocket.net/>
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