Difference between revisions of "RFID Card with UID Rewritable"
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| − | * I have been unsuccessful in writing the UID on this card as advertised, using the nfc-mfsetuid program from libnfc. (this program uses a special "unlock" command, the first step of which is transceiving 7-bits of value 0x40; the card does respond to this, but then does nothing else). | + | *UID unlock |
| − | + | **I have been unsuccessful in writing the UID on this card as advertised, using the nfc-mfsetuid program from libnfc. (this program uses a special "unlock" command, the first step of which is transceiving 7-bits of value 0x40; the card does respond to this, but then does nothing else). | |
I did not receive any documentation with the card, so I am not sure if a different procedure is needed, or if the card is defective. Please advise. | I did not receive any documentation with the card, so I am not sure if a different procedure is needed, or if the card is defective. Please advise. | ||
| − | ** Thank you very much for the quick reply! I am embarrassed to tell you that my problem was due to an error on my part calculating a CRC. | + | **Thank you very much for the quick reply! I am embarrassed to tell you that my problem was due to an error on my part calculating a CRC. |
| − | |||
I was able to get the reset commands contained in the libnfc source code to work (7-bit 0x40, followed by 8-bit 0x43 for unlock), but I only know these commands from looking at the source code for that project; if there is any documentation for the card, I would very much appreciate it. | I was able to get the reset commands contained in the libnfc source code to work (7-bit 0x40, followed by 8-bit 0x43 for unlock), but I only know these commands from looking at the source code for that project; if there is any documentation for the card, I would very much appreciate it. | ||
Latest revision as of 15:11, 19 December 2012
FAQ
- UID unlock
- I have been unsuccessful in writing the UID on this card as advertised, using the nfc-mfsetuid program from libnfc. (this program uses a special "unlock" command, the first step of which is transceiving 7-bits of value 0x40; the card does respond to this, but then does nothing else).
I did not receive any documentation with the card, so I am not sure if a different procedure is needed, or if the card is defective. Please advise.
- Thank you very much for the quick reply! I am embarrassed to tell you that my problem was due to an error on my part calculating a CRC.
I was able to get the reset commands contained in the libnfc source code to work (7-bit 0x40, followed by 8-bit 0x43 for unlock), but I only know these commands from looking at the source code for that project; if there is any documentation for the card, I would very much appreciate it.
