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Author Topic: Communication with RFID chips like HELP HELP  (Read 2329 times)
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elwakeel
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« on: April 08, 2009, 12:09:12 12:09 »

Dear all,

I have a question and really could use your help.

At the moment I'm working on a project for RFID reader. I noticed that most of the RFID reader chips on the market are compatible with ISO14443 protocols, but they have a fifo buffer that holds the frames of the protocol. I mean, if I want to send a command like WAKEUP, or HALT, I will have to create the appropriate frame for the the command according to the ISO protocol and then transmit that frame to the fifo of the reader.

Is what I just said right?

if so, is there any library for functions that creates the frames for me, that is, for example function like this

*char WAKEUP(void); // function that creates the frame for the command WAKEUP and returns a pointer to the frame

if there, could you please point me to them?

also is there a single RFID chip that does the framing for me, for example, if I send a byte 0xDB for example, the chip will initiate a wakeup sequence.

is there a single chip that can do this ?

thanks you so much, please I need your help as I'm very close to my graduation project delivery date.
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Orcino Borges
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« Reply #1 on: April 08, 2009, 02:18:51 14:18 »

TRF7960 , TRF7961
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elwakeel
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« Reply #2 on: April 08, 2009, 02:49:06 14:49 »

Dear Orcino,

thanks for your reply. I have read the datasheet of the TRF7960 and have a question:

the chip has a fifo and registers for protocol and mode programmig, besides the frame transmission. What I understood is that i have to create the complete frames for different commands in the ISO14443 protocol and send them into the fifo to be transmitted, is what i understood right??

please, correct me if I'm wrong, thanks
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flyback
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« Reply #3 on: April 08, 2009, 06:18:30 18:18 »

Hello Elwakeel,
About the TRF7960, Texas sells a eval kit for it
http://focus.ti.com/docs/toolsw/folders/print/trf7960evm.html

Fortunately the source code (even in C, so must be portable to other uP) can be freely downloaded at
http://focus.ti.com/lit/sw/sloc136/sloc136.zip

Please take a look at 14443.c, they clearly describe how to fill the FIFO, per example:
....
   buf[0] = 0x8f;
   buf[1] = 0x91;         /* buffer setup for FIFO writing */
   buf[2] = 0x3d;
   buf[3] = 0x00;
   buf[4] = 0x70;
   buf[5] = select;
   buf[6] = 0x70;
   RAWwrite(buf, 12);      /* send the request using RAW writing */

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elwakeel
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« Reply #4 on: April 13, 2009, 08:25:53 20:25 »

Dear All,

I have a another question about RFID. I'm using TRF7960 reader chip. My question is:

I've succeeded to program the reader registers, configured it to ISO14443-A protocol. I was able to send REQA command and got the response from the tag, I sent SELECTS command and the tag responded. now the tag is selected but I don't know how to write or read data from the memory of the tag, can anybody tell me please, how to write to some certain address in the tag or read from a certain address.

Thanks so much, please anyone with any small piece of information, reply and say it.
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flyback
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« Reply #5 on: April 16, 2009, 09:45:36 09:45 »

There are absolutely no need to post multiple identical messages. If someone can help you, he will.
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