FreeCalypso > hg > fc-sim-sniff

annotate README @ 53:737579209153

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fpga/sniffer-pps: add LED indication of running SIM CLK
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Oct 2023 19:35:29 +0000
parents f8c27c2bde0e
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1 Welcome to FreeCalypso SIMsniff
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2 ===============================
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4 FreeCalypso SIMsniff is an alternative project to Osmocom SIMtrace, created in
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5 response to technical limitations of the latter. Both tools seek to solve the
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6 same problem (trace or sniff all communication between a phone, modem or other
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7 interface device and a SIM card) and use some passive hardware components in
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8 common (the FPC adapter cable that goes into the phone's SIM socket), but use
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9 different active components: Osmocom SIMtrace uses an AT91SAMx MCU as the ISO
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10 7816-3 sniffing receiver, whereas FC SIMsniff uses a voltage translating buffer
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11 followed by an iCE40 FPGA instead.
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13 The principal practical difference between the two tools is that FC SIMsniff is
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14 electrically clean and proper:
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16 * The sniffing apparatus makes a strictly Hi-Z connection to the SIM bus being
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17 sniffed;
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19 * The SIM bus itself is solidly connected from the phone's SIM socket to the
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20 physical SIM without any switches or pull-ups or other Heisenbug-inducing
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21 artifacts;
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23 * The sniffing apparatus supports all 3 voltage classes that can be put out by
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24 the ME or other interface device: 1.8V, 3V and 5V are all good.
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26 The hardware setup of FC SIMsniff consists of:
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28 * The same SIMtrace FPC cables (going from a SIM socket to the 6-pin FPC
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29 connector) that were originally developed for SIMtrace1/2 and are sold by
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30 Sysmocom;
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32 * An off-the-shelf Lattice Icestick FPGA board;
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34 * A little bit of custom hardware: two very simple boards in the initial
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35 version, intending to consolidate them into one board in the final version,
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36 see doc/Sniffing-hw-setup for the details.
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38 This source repository contains:
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40 boards Design files for little adapter boards
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41 fpga Gateware for the iCE40HX1K FPGA on the Icestick board
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42 sw Host software tools