1. configure OpenPCD to send data continuously
- connect USB debug cable to RS232_CMOS connector on OpenPCD - black wire is Pin 1
- cu -l/dev/ttyUSB0 -s115200 (debug terminal - where ttyUSB0 is the debug cable. You can find 'cu' in the uucp packet. Make sure that your current user is also in the group 'uucp' to use this software )
- power cycle OpenPCD again - OpenPCD boot message appear
- press 'A' on debug terminal to enable continuous long packet transmission by OpenPCD - green LED turns on continuously in return
2. compile openpcd_test:
- mkdir openpicc
- cd openpicc
- svn co http://svn.openpcd.org/trunk/host/
- svn co http://svn.openpcd.org/trunk/firmware/
- cd host
- make opcd_test
- mv opcd_test opicc_test
- plug OpenPICC into USB port
- sudo ./opicc_test -L
3. Configure OpenPICC via USB debug cable:
- plug the debug cable into OpenPICC - black wire towards jumper socket in top right
- press '}` several times to decrease the sampling clock divider to the lowest value
- press 'd' till SSC-Mode is set to '5'
- press 's' to start sampling
- press 'a' to stop sampling
- analyse /tmp/opcd_samples for sampled data (see example file)
4. Decode the sniffed data:
- wget http://www.openpcd.org/dl/openpicc/decode_openpicc.c
- gcc -O2 -o decode decode_openpicc.c
- ./decode /tmp/opcd_samples
- Example output:
Y
Z[07]0 Z[07]0 Z[07]0 Z[07]0 Z[07]0 Z[07]0 Z[07]0 Z[00]0 [11]1 ==0x00
X[07]1 X[07]1 X[07]1 X[07]1 X[07]1 X[07]1 X[07]1 X[07]1 X[07]1 ==0xFF
X[07]1 X[11]0 Z[07]0 Z[00]0 [11]1 X[11]0 Z[07]0 Z[00]0 [12]1 ==0x11
X[00]0 [14]1 X[11]0 Z[07]0 Z[00]0 [11]1 X[11]0 Z[00]0 [11]1 ==0x22
X[07]1 X[07]1 X[11]0 Z[00]0 [11]1 X[07]1 X[11]0 Z[00]0 [11]1 ==0x33
X[12]0 Z[00]0 [10]1 X[11]0 Z[07]0 Z[00]0 [11]1 X[00]0 [16]1 ==0x44
X[06]1 X[00]0 [15]1 X[00]0 [16]1 X[00]0 [14]1 X[00]0 [15]1 ==0x55
X[00]0 [16]1 X[06]1 X[12]0 Z[00]0 [11]1 X[06]1 X[00]0 [15]1 ==0x66
X[00]0 [16]1 X[00]0 [14]1 X[11]0 Z[00]0 [12]1 X[10]0 Z[08]0 ==0x4A
Z[07]0 Z[00]0 [11]1 X[07]1 X[11]0 Z[00]0 [11]1 X[10]0 Z[08]0 ==0x4C
CRC OK