Topic: how to communicate between two readers?
Can anyone help me about the communication between two readers? I am trying to exchange data between two reader. Is it possible ?
Re: how to communicate between two readers?
Hi !
avra wrote:
Can anyone help me about the communication between two readers?
We could try...
avra wrote:
I am trying to exchange data between two reader. Is it possible ?
Yes, its possible. Check the examples wrote by François Kooman : nfcip-target & nfcip-initiator in development version of libnfc.
Romuald Conty
Re: how to communicate between two readers?
Thanx rconty... are you talking about http://code.google.com/p/nfcip-java/sou … _PN53x.txt page? is it possible to use libnfc for it? in this page I can see some command for making the communication between readers. But where should I put the command? in the minicom or somewhere else?
Re: how to communicate between two readers?
avra wrote:
Thanx rconty... are you talking about http://code.google.com/p/nfcip-java/sou … _PN53x.txt page?
No, I'm not. I talk about http://code.google.com/p/libnfc/source/ … nitiator.c
avra wrote:
is it possible to use libnfc for it?
No : nfcip-java is in JAVA but libnfc in C without bindings in JAVA.
avra wrote:
In this page I can see some command for making the communication between readers. But where should I put the command? in the minicom or somewhere else?
There commands are sent to PN53x chip. To send them you can use libnfc if your reader is compatible.
Romuald Conty
Re: how to communicate between two readers?
Thanks rconty... can I download the file directly from the webpage or do I need to copy the code??
Re: how to communicate between two readers?
when I copy the code, it's giving me errors during compilation...
Re: how to communicate between two readers?
I include libnfc.h and stdlib.h...but still i am getting the following errors...
my errors are as follows:
nfcip-initiator.c: In function ‘main’:
nfcip-initiator.c:12: error: ‘nfc_device_t’ undeclared (first use in this function)
nfcip-initiator.c:12: error: (Each undeclared identifier is reported only once
nfcip-initiator.c:12: error: for each function it appears in.)
nfcip-initiator.c:12: error: ‘pnd’ undeclared (first use in this function)
nfcip-initiator.c:13: error: ‘nfc_target_info_t’ undeclared (first use in this function)
nfcip-initiator.c:13: error: expected ‘;’ before ‘ti’
nfcip-initiator.c:18: error: too many arguments to function ‘nfc_connect’
nfcip-initiator.c:20: error: ‘NM_PASSIVE_DEP’ undeclared (first use in this function)
nfcip-initiator.c:21: error: ‘ti’ undeclared (first use in this function)
Re: how to communicate between two readers?
if (!pnd || !nfc_initiator_init(pnd)
|| !nfc_initiator_select_dep_target(pnd, NM_PASSIVE_DEP, NULL, 0,
NULL, 0, NULL, 0, &ti)) {
i have fixed the other problems , but i have problems with the above line....
the error is
‘NM_PASSIVE_DEP’ undeclared (first use in this function)
nfcip-initiator.c:22: error: (Each undeclared identifier is reported only once
nfcip-initiator.c:22: error: for each function it appears in.)
the function name is changed ...so i keep the name as previous version to fix it.
Re: how to communicate between two readers?
Hello avra,
NFCIP is an experimentale features that comes from development version of libnfc. You need to compile the whole sources in trunk not nfcip-initiator.c only.
Under Linux (or other POSIX system), to build libnfc from svn:
svn checkout http://libnfc.googlecode.com/svn/trunk/ libnfc
cd libnfc
./autogen.sh
make
sudo make installHope it helps.
Romuald Conty
Re: how to communicate between two readers?
I am trying to use the nfcip-initiator and nfcip target, but i can't find any documentation of this programs. So do i need to pass any arguments with this programs... I have two readers and I just want to communicate between them. When I am running the program its not giving me any error but its just waiting for something. Helps will be appreciated strongly.
Re: how to communicate between two readers?
There is no documentation for theses experimental examples, only source code can help you ATM.
We need and will improve P2P support under libnfc, help will be appreciated strongly ;-)
Romuald Conty
Re: how to communicate between two readers?
hi Romuald,
thanks for your help...actually we are trying to use the nfc_connect function in a program...but it's saying that undefined reference...nfc_device_t declaration is fine...but the only error I am getting in the nfc_connect function...("undefined reference")...can u help me in fixing that???do i need to include any other header file??the result is same when I am trying to compile any other example files....waiting for ur reply
Re: how to communicate between two readers?
Hi avra,
avra wrote:
nfc_connect function...("undefined reference")...can u help me in fixing that?
It seems to be a missing argument in compiler command line options: you need to link with libnfc. In example, for GCC :
gcc -o mynfcprog mynfc.c -lnfcRomuald Conty