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annotate doc/RF_tables @ 148:0e7a85356130

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doc/RF_tables write-up added
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 Feb 2017 08:34:31 +0000
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children 158fef5f4b82
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148
0e7a85356130 doc/RF_tables write-up added
Mychaela Falconia <falcon@freecalypso.org>
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1 TI's TCS211 firmware for the Calypso+Iota+Rita chipset maintains a number of
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Mychaela Falconia <falcon@freecalypso.org>
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2 tables for RF calibration and configuration. These tables can be saved in the
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3 non-volatile flash file system (FFS), as normally required for per-unit RF
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4 calibration; tables that are saved in FFS will be automatically read when the
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5 firmware boots and whenever it switches between 900+1800 and 850+1900 MHz band
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6 pairs. There is also a compiled-in default for each of the tables built into
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7 the firmware image; these defaults are used whenever a given table is not found
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8 in FFS.
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9
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10 The firmware also provides Test Mode commands (accessed via the RVTMUX binary
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11 packet interface) through which an external host can read and write the in-RAM
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12 working copies of these RF calibration and configuration tables; the standard
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13 expected workflow is as follows:
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14
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15 * When the firmware first boots on a freshly manufactured board with a blank
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16 FFS, the in-RAM working tables are loaded from the compiled-in defaults.
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17
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18 * The factory production test and RF calibration station connects to the
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19 running firmware via RVTMUX, and as it goes through the requisite calibration
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20 steps, properly adjusted RF tables are formed in the firmware's working in-RAM
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21 locations.
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22
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23 * The production test and calibration station sends some special command packets
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24 (encoded via the MISC_ENABLE opcode) to the firmware; these commands tell the
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25 firmware to take the in-RAM RF tables and save them in the non-volatile FFS.
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26 There are separate me commands for saving different groups of RF tables,
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27 divided into RF calibration, RF config, Tx calibration, Tx config,
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28 Rx calibration and Rx config. The tables in the Tx config and Rx config
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29 groups are never modified in practice, hence they are usually not written
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30 into FFS and the fw uses the compiled-in versions instead.
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31
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32 * In normal operation the GSM device firmware reads the RF calibration and
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33 configuration tables that have been written into FFS on the production line
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34 and subsequently persist for the lifetime of the device.
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35
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36 FreeCalypso tools provide the following support for working with these tables:
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37
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38 * We have defined our own ASCII text-based format in which each of the RF tables
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39 implemented by TCS211 fw can be represented. This text format is both human-
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Mychaela Falconia <falcon@freecalypso.org>
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40 and machine-readable.
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41
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42 * Our fc-tmsh utility (the tool that exchanges Test Mode command packets with
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Mychaela Falconia <falcon@freecalypso.org>
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43 running firmwares) supports rftw and rftr commands for reading and writing
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44 the fw's in-RAM RF tables via RF_TABLE_WRITE and RF_TABLE_READ command
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45 packets. Our implementation of the rftw command takes the table data input
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46 in the form of ASCII text files in our format, and the tables read back from
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47 the fw via the rftr command can be written out into host files in the same
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48 format.
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49
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50 * RF tables that have been saved in the non-volatile FFS can be read out
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51 "in vivo" via fc-fsio or "in vitro" from a raw flash dump via tiffs. They
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52 are in the firmware's native binary format. Our fc-cal2text utility can be
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53 used to convert these binary files into our adopted text format for easier
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54 analysis. The conversion is lossless, but we do not currently have a utility
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55 to perform the opposite conversion, as there does not appear to be a use case
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56 for it. If such a use case does arise, it will be easy to construct the
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57 appropriate tool(s).
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58
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59 In the case of two particular RF tables there is a slight difference between
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60 the way they are stored in FFS and the way they are read and written via Test
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61 Mode commands:
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62
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63 * The firmware maintains 3 separate tables for il2agc (input level to AGC)
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64 conversion, to be used in different circumstances. As it happens, the
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65 compiled-in default is the same for all 3 tables and these tables are never
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66 changed in practice, but "by the book" they are still 3 separate tables.
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67 In FFS all 3 tables are concatenated together in a single file
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68 /gsm/rf/rx/il2agc, but for the rftw and rftr command packet exchanges they
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69 are 3 separate tables.
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70
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71 * For each supported frequency band there is a table of Tx power ramp-up and
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72 ramp-down profiles. Each single ramp is 16 bytes, each ramp-up & ramp-down
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73 pair is 32 bytes, and the firmware allows for 16 of these stored templates.
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74 The complete table is stored in FFS as a single file of 512 bytes, but it is
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75 too big for the TM3 protocol. Instead the Test Mode protocol provides
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76 dedicated TX_TEMPLATE_WRITE (ttw) and TX_TEMPLATE_READ (ttr) commands which
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77 write or read one 32-byte template at a time.
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78
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79 The ASCII text file representation of the RF tables adopted in FreeCalypso
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80 follows the Test Mode protocol model where it deviates from the FFS model:
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81 fc-cal2text turns the /gsm/rf/tx/ramps.* file for each band into 16 individual
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82 ramp files, and if there is a /gsm/rf/rx/il2agc file, it will be turned into
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83 three separate il2agc-av, il2agc-max and il2agc-pwr table files.