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doc/Tx-cal-theory: channel calibration documented
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 14 Feb 2018 04:54:58 +0000
parents b68301b38ff2
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b68301b38ff2 doc: Cable-config-howto and General-flow written
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1 The general flow of using fc-rfcal-tools to calibrate Calypso GSM devices is as
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2 follows:
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4 * At the beginning of your calibration work session, you need to power on your
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5 CMU200, wait for it to finish booting, and then run fc-cmu200d; the fc-cmu200d
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6 command line takes the following form:
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8 fc-cmu200d -c cable_name /dev/ttyXXX 19200
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10 Change /dev/ttyXXX to the serial port that is connected to the CMU200, give
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11 fc-cmu200d the same baud rate that is configured on the CMU (19200 is the
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12 default), and select the appropriate cable configuration with the -c option:
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13 see the Cable-config-howto article.
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15 By default the RF2 port on the CMU200 will be used; you can give a -1 option
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16 to use the RF1 port instead, or you can include an 'rf-port 1' or 'rf-port 2'
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17 line in your cable config files to have the port selection go with the -c
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18 selection.
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19
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20 * In typical usage the fc-cmu200d process you started in the previous step can
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21 persist through any number of individual device calibrations, as on a factory
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22 production line. However, if you need to switch to a different cable setup
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23 with different loss numbers, you will need to kill the fc-cmu200d process and
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24 restart it with the appropriate new -c option.
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26 * To calibrate an individual Calypso GSM device, you will need to have an
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27 rvinterf process running, talking to the RVTMUX UART channel on that device.
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28 Booting your Calypso GSM device in the correct manner and running rvinterf
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29 with the right arguments is your responsibility: fc-rfcal-* tools will expect
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30 rvinterf to be running already, and will not launch it themselves.
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31
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32 * With both fc-cmu200d and rvinterf running, talking to your CMU200 and your
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33 DUT, respectively, and with the correct RF coax (matching your fc-cmu200d -c
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34 selection) connected between the two, you can now run the actual calibration
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35 automation programs. For a 900/1800/1900 MHz triband Calypso GSM device, the
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36 standard sequence is as follows:
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37
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38 fc-rfcal-vcxo
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39 fc-rfcal-rxband 900
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40 fc-rfcal-rxband 1800
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41 fc-rfcal-rxband 1900
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42 fc-rfcal-txband 900 <profile>
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43 fc-rfcal-txband 1800 <profile>
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44 fc-rfcal-txband 1900 <profile>
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45
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46 The <profile> argument to fc-rfcal-txband commands needs to be changed to the
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47 name of the appropriate Tx levels calibration profile; see the Tx-cal-theory
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48 article for more information.
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49
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50 Each of the fc-rfcal-* steps finishes by writing the values it has calibrated
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51 into the Calypso device's non-volatile flash file system (FFS); once all of the
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52 steps have been completed, the Calypso device is fully calibrated. After the
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53 calibration procedure the Calypso device should be rebooted before normal AT
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54 command operation is attempted.