FreeCalypso > hg > freecalypso-tools
annotate doc/RF-cal/Architecture @ 201:59de85ae94a7
target-utils/flash-boot-wa written
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 01 May 2017 21:02:58 +0000 |
parents | bab88077deba |
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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. |