FreeCalypso > hg > fc-magnetite

annotate doc/Voice-pseudo-modem @ 598:717ed17d82c6

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aci3 vocoder control revamped, AT@VSEL now works as it should The vocoder control code (hl_audio_drv.c) that came with the TCS3 version of ACI was totally broken in the Calypso config (VOCODER_FUNC_INTERFACE) and worked in the standard analog voice environment only by luck. This code has now been rewritten to work correctly with our Calypso platform and TCS211 L1, and our new AT@VSEL mechanism (automatic enabling and disabling of MCSI voice path as the modem enters and exits the voice call state) now also works as designed.
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Mar 2019 23:44:35 +0000
parents 2f880890c189
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1 Back when TI's TCS211 fw existed in the traditional world of phone handset and
3f1a587b3a84 doc/Voice-pseudo-modem written
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2 cellular modem manufacturers, there were only two principal classes of target
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3 devices for it: handsets and modems. The former have local UI hardware (LCDs
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4 and keypads) and run firmware that works with this UI hw, the latter have no
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5 such hw and run firmware that expects to be controlled by an external host via
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6 AT commands.
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7
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8 But the peculiar circumstances under which our FreeCalypso family of projects
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9 operates give rise to a third possibility: what happens if one were to run
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10 non-UI-capable firmware that expects control via AT commands on a hardware
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11 target device that was originally designed to be an end user phone handset, in
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12 our case either Motorola C1xx or Pirelli DP-L10? The result is what I call a
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13 voice pseudo-modem (VPM): the phone's LCD stays dark, the buttons do nothing
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14 and the device expects to be controlled via AT commands as if it were a modem
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15 like the one in GTA01/02 smartphones, but there is no practically usable way to
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16 make use of any data services, only voice and SMS, hence my VPM term.
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17
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18 It needs to be noted clearly that the VPM hack described in this article is NOT
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19 a substitute for proper modem hardware - if your area of interest is Standard
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20 Modem functionality (the full set of GSM and GPRS services accessed via AT
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21 commands), then you need a proper hardware platform for it, such as our FCDEV3B
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22 hardware product. However, support for VPM operation in FreeCalypso exists for
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23 the following purposes:
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24
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25 * On some hw targets the VPM configuration can be an intermediate stepping stone
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26 toward potential future UI-enabled firmware (see the Handset-goal article) -
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27 this situation holds on the C139.
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28
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29 * Being able to run FreeCalypso fw in the VPM configuration on Mot C1xx hw that
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30 many people already have and that may still be readily and cheaply available
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31 makes our firmware accessible to those who are not able to afford our
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32 expensive FCDEV3B hardware.
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33
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34 * If you have a Pirelli DP-L10 phone (now very rare and hard to get, but were
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35 readily available in early 2013 when I started FreeCalypso): while there is
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36 unfortunately very little chance of being able to turn it into a practically
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37 usable Libre Dumbphone with FreeCalypso (the unwanted extra chips sans docs
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38 which we don't know how to power down are a killer), running FreeCalypso fw
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39 on the Pirelli in the VPM configuration is so easy and convenient that I do
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40 it all the time during development and testing.
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41
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42 Building firmware for VPM operation
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43 ===================================
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44
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45 The following two firmware build configurations (in the ./configure.sh sense)
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46 are appropriate for VPM usage:
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47
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48 hybrid-vpm This is the TCS2/TCS3 hybrid config (see the Modem-configs
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49 article) that has all data services (CSD, fax and GPRS)
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50 disabled and FCHG (new FreeCalypso battery charging driver)
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51 enabled. The removal of data services code makes the firmware
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52 image size and its RAM usage significantly smaller than all
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53 other configurations, making hybrid-vpm the smallest of all
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54 FC Magnetite firmware configs.
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55
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56 l1reconst-chg This is a variant of the stable l1reconst config (again, see
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57 the Modem-configs article) that has our FCHG battery charging
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58 driver enabled. Because this config uses the TCS211 blob
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59 version of the G23M PS, data services cannot be disabled, and
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60 the associated code sits in the firmware image as dead weight.
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61 Thus this l1reconst-chg config produces much heavier fw images
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62 than hybrid-vpm, and should only be used when you suspect a bug
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63 in the new TCS3 G23M or ACI code and would like to run the old
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64 TCS2 version for comparison.
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65
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66 Mot C139/140 and C155/156 phones have enough flash and RAM to run the
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67 l1reconst-chg config (with data services code as non-exercisable dead weight),
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68 but the more basic C11x/12x models (the ones with black&white LCDs) have
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69 smaller memories, and the only FC Magnetite config that is small enough to fit
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70 into their tiny flash and XRAM capacity is hybrid-vpm.
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71
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72 Playing with FreeCalypso VPM on C1xx phones
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73 ===========================================
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74
382
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75 If a Mot C1xx phone is flashed with a FreeCalypso firmware image in the VPM
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76 configuration (see C1xx-Howto for the messy details of how to do it), it will
376
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77 behave as follows:
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78
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79 * The LCD will remain dark and the buttons will do nothing no matter what.
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80
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81 * If you plug in Motorola's charging adapter (it's a regulated 5 VDC power
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82 source, but with a non-USB connector) and you had properly installed the
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83 charging config file when creating the aftermarket FFS for FreeCalypso, the
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84 battery will charge. When you unplug the charging adapter, if there is no
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85 host computer running FC host program rvinterf connected to the phone
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86 serially, the phone will power off some 15 to 20 s after the charger unplug.
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87
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88 * If you press the power button while the phone is off, even momentarily, the
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89 phone will power on and boot (with nothing on the LCD as usual), but if the
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90 headset jack serial port is not connected to a computer running rvinterf, the
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91 firmware will execute a power-off after at most 20 s.
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92
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93 * In order to make the phone-turned-VPM do anything useful, you will need to
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94 connect the headset jack serial port to a host computer running FC host tools,
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95 run rvinterf to keep the phone alive (keep it from automatically powering
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96 off), and use FC host utility fc-shell to issue AT commands to it over the
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97 RVTMUX channel managed by rvinterf.
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98
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99 * The phone will remain on (i.e., the fw won't execute an automatic power-off)
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100 for as long as there is either a charging power adapter plugged in or a
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101 connected host computer running rvinterf - if there is no charging power,
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102 the fw will send periodic keepalive queries to check for the presence of a
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103 connected rvinterf process.
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104
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105 Playing with FreeCalypso VPM on a Pirelli DP-L10
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106 ================================================
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107
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108 There are two ways in which one can play with FC VPM firmware on a Pirelli:
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109
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110 * FC VPM fw can be flashed into the phone just like on Mot C1xx. To make this
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111 approach sensible, you will also need to craft and install a charging config
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112 file that will cause our FCHG driver to initiate the charging process
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113 automatically when the battery voltage falls below some sensible threshold,
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114 without requiring manual charging start via AT@CHG=1. In this case the
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115 reflashed phone will behave like C1xx in the previous section, except that
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116 the charging power source and the host computer connection are one and the
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117 same in the case of Pirelli's USB.
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118
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119 * The other approach is to keep Pirelli's original fw in the flash, let the
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120 phone function normally when not in the middle of a FreeCalypso VPM session,
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121 and load our FC VPM fw into RAM via fc-xram, making use of this phone's huge
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122 RAM that can hold an entire functional fw image without flashing. This is
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123 the Mother's preferred method.
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Mychaela Falconia <falcon@freecalypso.org>
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124
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125 See the Pirelli-Howto article for the details.