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annotate doc/RF_tables @ 909:1e9fe07f8f09

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doc/Voice-memo-utils: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 29 Dec 2022 21:03:11 +0000
parents 817f3b5f019e
children
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1 TI's TCS211 firmware for the Calypso+Iota+Rita chipset maintains a number of
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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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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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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 with the save-rf-table command.
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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.
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55
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56 * Any RF table in our ASCII format can be converted back into the corresponding
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57 native binary with our fc-cal2bin utility.
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58
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59 * Each RF table type for which there is a directly corresponding file in FFS
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60 can be uploaded into the FFS of a FreeCalypso GSM device directly from our
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61 ASCII format with the fc-fsio utility's upload-rf-table command.
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62
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63 In the case of two particular RF tables there is a slight difference between
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64 the way they are stored in FFS and the way they are read and written via Test
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65 Mode commands:
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66
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67 * The firmware maintains 3 separate tables for il2agc (input level to AGC)
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68 conversion, to be used in different circumstances. As it happens, the
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69 compiled-in default is the same for all 3 tables and these tables are never
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70 changed in practice, but "by the book" they are still 3 separate tables.
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71 In FFS all 3 tables are concatenated together in a single file
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72 /gsm/rf/rx/il2agc, but for the rftw and rftr command packet exchanges they
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73 are 3 separate tables.
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74
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75 * For each supported frequency band there is a table of Tx power ramp-up and
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76 ramp-down profiles. Each single ramp is 16 bytes, each ramp-up & ramp-down
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77 pair is 32 bytes, and the firmware allows for 16 of these stored templates.
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78 The complete table is stored in FFS as a single file of 512 bytes, but it is
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79 too big for the TM3 protocol. Instead the Test Mode protocol provides
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80 dedicated TX_TEMPLATE_WRITE (ttw) and TX_TEMPLATE_READ (ttr) commands which
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81 write or read one 32-byte template at a time.
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82
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83 Our FreeCalypso ASCII RF table format includes support for a table of type
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84 tx-ramps; these ramps tables can be written by fc-cal2text, converted back to
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85 native binary with fc-cal2bin and uploaded with fc-fsio's upload-rf-table
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86 command, but cannot be uploaded with fc-tmsh's rftw command corresponding to
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87 the RF_TABLE_WRITE Test Mode command. There is also an ASCII format for a
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88 single Tx ramp template that can be uploaded with the ttw command; templates
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89 read back via the ttr command can be saved in the same format with the
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90 save-tx-ramp command.
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91
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92 In the case of the il2agc table, a FreeCalypso ASCII RF table of type il2agc is
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93 singular as in the Test Mode protocol, not triple as in FFS.