FreeCalypso > hg > freecalypso-citrine

annotate doc/TCH-special-feature @ 36:3362a76ab432

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doc/TCH-special-feature: outdated info removed, added referral to the TCH-bit-access write-up in the freecalypso-tools tree
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 15 Oct 2016 06:03:45 +0000
parents cb00b90edaff
children
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1 FreeCalypso Citrine firmware implements an optional special feature (needs to be
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2 explicitly enabled at compile time) which we call TCH rerouting. When this
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3 feature is enabled, it applies the following special handling to GSM voice
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4 traffic channels (TCH):
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5
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6 * All downlink TCH bits passing from the channel decoder to the vocoder block
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7 (260 bits every 20 ms; only FR and EFR codecs are supported) can be non-
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8 invasively intercepted and forwarded to the external host connected to the
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9 RVTMUX serial interface;
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11 * Using the same serial interface, the external host can supply substitute
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12 uplink TCH bits which will be transmitted in the place of the built-in
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13 vocoder output, i.e., the latter can be effectively suppressed.
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14
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15 In order to use this feature, you need to compile our firmware in the voice+SMS
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16 pseudo-modem configuration, i.e., the configuration in which the fw expects to
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17 be controlled via AT commands wrapped in the RVTMUX binary packet serial
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18 interface. You can use a target GSM device that has just one accessible serial
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19 port (Mot C1xx and Pirelli DP-L10) or one that has two Calypso UARTs (Openmoko
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20 GTA02 or our future FCDEV3B), but in the latter case you will be using only one
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21 UART - whichever one you have configured to be RVTMUX.
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23 Whatever system you are building that will act as the source and sink for TCH
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24 bits will need to interface to the FreeCalypso GSM device via a serial port in
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25 the RVTMUX binary packet format. Your system will need to send RVTMUX packets
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26 with AT commands inside them in order to command the FC GSM device to register
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27 with the network and to dial and/or answer calls, and you will need to send
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28 RVTMUX packets of a different kind in order to supply the uplink TCH bits
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29 during calls. In the other direction, your system will receive responses to
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30 the AT commands you send, asynchronous notifications of incoming calls and SMS,
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31 downlink TCH bits and various debug trace output from our FreeCalypso firmware.
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32 The last part (debug trace output) can be simply ignored and discarded if you
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33 wish, but we strongly recommend that you provide a way to view and/or log it
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34 for debugging purposes.
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35
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36 Please see the RVTMUX document in the FreeCalypso host tools package for general
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37 background information regarding the RVTMUX binary packet interface; this
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38 document should be considered required reading for anyone interested in working
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39 with the TCH rerouting special feature.
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40
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41 All packets transferred over the RVTMUX interface begin and end with 0x02. If
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42 a payload byte within a packet equals 0x02 or 0x10, it needs to be prepended
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43 with 0x10 as a transparency escape; all other payload bytes are sent literally.
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44 The first byte within each RVTMUX packet after the opening 0x02 is the packet
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45 type; the two packet types you will need to handle (both generate and receive)
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46 are 0x1A for AT commands and 0x1C for TCH configuration commands.
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47
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48 To send an AT command to the FreeCalypso GSM device, prepend the 0x1A packet
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49 type in front of the "AT" characters, wrap the packet with 0x02 bytes on both
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50 ends, and send it to the modem. Responses to AT commands and asynchronous
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51 notification messages such as "RING" for incoming calls will be sent to the
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52 host as RVTMUX packets also beginning with the 0x1A packet type; they will be
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53 interspersed among other packet types, mostly debug trace output. Your system
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54 will need to receive the RVTMUX serial byte stream continuously, parsing the
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55 packet structure and looking at the type of each packet (the first byte after
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56 the opening 0x02) in order to detect if the modem has sent something you may be
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57 interested in.
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58
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59 If you wish to receive a copy of all downlink TCH bits on the serial channel,
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60 you will need to send the following 5-byte command packet to the modem:
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61
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62 0x02: opening flag
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63 0x1C: RVTMUX packet type for TCH
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64 0x11: TCH_CONFIG_REQ command opcode
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65 0x01: payload byte indicating that the "forward downlink" state should be
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66 set to enabled
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67 0x02: closing flag
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68
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69 The modem will respond with a TCH_CONFIG_CONF confirmation message (opcode
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70 0x12), and then during all voice calls your external host will receive the
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71 following packet every 20 ms:
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72
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73 0x02: opening flag
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74 0x1C: RVTMUX packet type for TCH
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75 0x15: TCH_DLBITS_IND opcode
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76 - 40 (decimal) bytes of payload -
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77 0x02: closing flag
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78
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79 The 40 bytes of payload sent in every TCH_DLBITS_IND packet directly correspond
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80 to the 20 16-bit words provided by the Calypso DSP in its a_dd_0 buffer. The
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81 first 3 words (6 bytes) contain the DSP's own status information (not fully
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82 understood by us yet, but we let you see what the DSP tells us without redacting
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83 anything out), and the remaining 17 words (34 bytes) contain the TCH bits
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84 received from the GSM network in the GSM 05.03 bit order - see TCH-bit-access
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85 write-up in the FreeCalypso host tools package for more information. Each DSP
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86 API word is sent in the big-endian byte order, i.e., the most significant byte
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87 followed by the least significant byte.
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88
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89 If you wish to send your own TCH uplink bits, replacing the output of the
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90 built-in vocoder with your own alternate uplink data, you will need to send
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91 your uplink TCH bits to the modem in packets of the following format:
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92
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93 0x02: opening flag
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94 0x1C: RVTMUX packet type for TCH
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95 0x13: TCH_ULBITS_REQ opcode
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96 - 33 or 34 (decimal) bytes of payload -
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97 0x02: closing flag
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98
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99 Sending 260 bits requires only 33 bytes, but the DSP operates in terms of
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100 16-bit words, hence 17 of those words are used. The least significant byte of
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101 the last word (i.e., the very last byte with our big-endian transmission order)
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102 is not expected to be used, but if you send 34 bytes rather than 33, you will
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103 have control over every bit going into the DSP API RAM in this case.
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104
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105 There is a queue inside the firmware in which these TCH uplink data blocks are
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106 stored; this queue is filled by the serial packet receiving handler and drained
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107 by the L1S (synchronous) code that executes at the right times in the GSM TDMA
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108 multiplex when uplink TCH transmission is expected. Up to 4 blocks can be
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109 queued up; as each queued-up block is transmitted on the air (more precisely,
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110 as it is passed to the DSP for channel encoding and transmission), a
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111 TCH_ULBITS_CONF short packet (consisting of just the opcode and nothing more)
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112 is sent to the host. These confirmation packets can be used to pace the sending
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113 of further TCH_ULBITS_REQs.
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114
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115 Testing
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116 =======
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117
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118 See TCH-bit-access write-up in the freecalypso-tools Hg repository.
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119
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120 Host side reference implementation
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121 ==================================
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122
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123 If you are going to implement your own system for talking to FreeCalypso GSM
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124 pseudo-modems via the RVTMUX binary packet interface, we strongly recommend
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125 that you use our rvinterf and fc-shell Unix/Linux host utilities as your
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126 starting point. You can find their source code in the freecalypso-tools Hg
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127 repository on Bitbucket.