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doc: Cable-config-howto and General-flow written
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 17 Jul 2017 18:26:30 +0000
parents bd62be88259d
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1 The RF calibration process fundamentally consists of 3 parts:
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2
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3 1: The FreeCalypso GSM MS device under test (DUT) to be calibrated;
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4
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5 2: An RF test station to which the DUT is connected via an RF coax cable,
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6 performing the RF signal analyzer and signal generator functions required
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7 for the calibration procedures;
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8
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9 3: A program that communicates with both the DUT and the RF test station and
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10 orchestrates all of the signal generation, measurement and computation steps
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11 to arrive at the final calibration results to be stored in the flash file
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12 system of the DUT. The steps are too numerous, tedious and repetitive to be
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13 performed manually, hence automation is required in order to make the process
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14 practical.
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15
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16 The goal of the FreeCalypso RF calibration subproject is to produce a set of
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17 tools for performing part 3 of the above breakdown. The current vision is that
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18 our automated calibration software will be broken down into two interfacing
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19 components:
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20
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21 1: There will be a Test System Interface Daemon (TSID) that encapsulates the
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22 magic specific to a particular brand of RF test station, e.g., R&S CMU200.
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23 The TSID will only talk to the CMU200 or other RF test station, but not to
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24 the Calypso DUT, and the intent is that the TSID only needs to be started
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25 once at the beginning of a calibration work shift and then stay running as a
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26 hundred or more FreeCalypso GSM devices may be calibrated on the production
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27 line. The TSID will present a local socket interface (can be changed to
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28 TCP/IP if operation over a network is required) to which the other component
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29 below will connect as a client.
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30
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31 2: There will be a set of 3 programs (fc-rfcal-vcxo, fc-rfcal-rxband and
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32 fc-rfcal-txband) that perform the 3 required calibration groups for each
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33 individual FreeCalypso device unit on the production line. The production
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34 automation script will need to run fc-rfcal-vcxo first, then fc-rfcal-rxband
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35 for each of the hardware-supported bands (e.g., 900, 1800 and 1900 on
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36 FCDEV3B-900), then fc-rfcal-txband for each of the same bands. Each of these
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37 programs will talk both to the DUT (via rvinterf) and to the RF test system
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38 (via the TSID), i.e., will need to connect to an already-running rvinterf
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39 process and to an already-running TSID via local sockets.
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40
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41 The programs in the second group above will contain no knowledge specific to
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42 R&S CMU200 or any other particular brand of RF test station, instead this
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43 knowledge is to be encapsulated in the TSID. The interface between the TSID
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44 and its clients will be of a command-response nature, and will be defined from
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45 the perspective of the needs of the FreeCalypso calibration process, rather than
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46 from the perspective of the capabilities of the CMU200 - in other words, the
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47 calibration automation program will command the TSID to the effect of "I need
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48 this", and it will be the responsibility of the TSID to figure out how to
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49 perform the required measurement or signal generation on the given type of test
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50 equipment.
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51
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52 See the Test-system-interface document for the details of the TSID socket
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53 interface.