osmocom-bb

History

Vadim Yanitskiy 1bffe899d9 trxcon/scheduler: introduce TCH/H TDMA frame mapping helpres Unlike xCCH, TCH/H channels are using block diagonal interleaving, so every single burst carries 57 bits of one traffic frame, and 57 bits of another one. Moreover, unlike TCH/F where both traffic and FACCH/F frames are interleaved over 8 bursts, a FACCH/H is interleaved over 6 bursts, while a traffic frame is interleaved over 4 bursts. This is why a TCH/H burst transmission can't be initiated on an arbitrary TDMA frame number. It shall be aligned as of stated in GSM 05.02, clause 7, table 1. This change introduces two basic functions: - sched_tchh_block_map_fn - checks if a TCH/H block transmission can be initiated / finished on a given frame number and a given channel type; - sched_tchh_block_dl_first_fn - calculates TDMA frame number of the first burst using given frame number of the last burst; and some auxiliary wrappers to simplify the usage of sched_tchh_block_map_fn(). Change-Id: Iaf4cb33f1b79df23f8a90c8b14ebe0cd9907fbb9		2018-09-16 02:12:09 +07:00
..
host	trxcon/scheduler: introduce TCH/H TDMA frame mapping helpres	2018-09-16 02:12:09 +07:00
shared	vty: skip installing cmds now always installed by default	2017-11-09 01:14:49 +00:00
target	trx_toolkit/fake_trx: drop Timing Advance range limitation	2018-09-07 09:02:19 +00:00
target_dsp	Drop unused imports from the python utilities.	2012-10-01 03:21:53 +02:00
Makefile	Merge 'fixeria/trx' into master	2018-04-07 19:35:24 +02:00
README.building	README.building: cosmetic: correct wiki links	2018-05-20 15:34:16 +03:00
README.development	README.development: add brief info about the TRX Toolkit	2018-05-20 15:46:20 +03:00

README.development

= Contributing to OsmocomBB development =

Feel free to help us by extending the code.  Always make sure to
send back all your patches to Gerrit (recommended) or to the
baseband-devel@lists.osmocom.org mailing list - Free Software
is all about sharing. For details, see:

https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit
https://gerrit.osmocom.org/

== Coding Style ==

Like all C language Osmocom projects, we use the Linux Kernel coding
style, you can find it in the Documentation/CodingStyle subdirectory
of any Linux Kernel source. For details, see:

https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

== More Information ==

Please consult the https://osmocom.org/projects/baseband/wiki/.

If you have any technical questions regarding the code, don't hesitate
to ask the baseband-devel@lists.osmocom.org mailing list.

== subdirectories containing libraries and code ==

=== src/shared/libosmocore ===

This is a library of various utility routines, including linked lists,
message buffers, bit-vectors, memory allocator, signals, select loop
handling, timers - as well as some more specifically GSM related things
like a TLV parser, a Comp128V1 implementation and utility functions for
RSL (TS 08.58) and CC/MM/RR (TS 04.08).

libosmocore is maintained in git://git.osmocom.org/libosmocore.git, so

	DO NOT DIRECTLY COMMIT TO libosmocore IN THIS REPOSITORY!

We simply maintain a copy (synchronized by git-subtree) in this
repository for the ease of building and to make sure everyone is using
the proper/compatible version of libosmocore

Please note, whatever you add to libosmocore will need to build as a
Linux userspace program (using glibc) just as well as on the OsmocomBB
embedded target without OS.  So please refrain from using fancy
functions.


=== src/target/firmware ===

The firmware is what we build for the actual target (phone).  It was
written with some idea of modularity in mind, i.e. we have

 * Ti Calypso specific code in calypso/
 * Analog Baseband code in abb/
 * RF Mixer code in rf/
 * Layer1 code in layer1/
 * NOR flash handling in flash/
 * LCD display handling in display/
 * minimal C-Library code in lib/
 * communications utility routines in comm/
 * Board (phone model/family) specific code in board/
   * board/compal_e88 is the Motorola C115-C124 family
   * board/compal_e99 is the Motorola C155 family
 * Applications (each app builds one firmware image) in apps/

=== src/target/trx_toolkit ===

A set of tools in Python for debugging TRX interface and creating
a virtual Um-interface between OsmocomBB and OsmoBTS. For details,
please refer:

https://osmocom.org/projects/baseband/wiki/TRX_Interface
https://osmocom.org/projects/baseband/wiki/FakeTRX
target/trx_toolkit/README

=== src/target_dsp/calypso ===

This is where we keep some (assembly) code that we wrote for
the DSP that is part of the Calypso DBB.

=== src/host/layer23 ===

The Layer2 (LAPDm / TS 04.06) and Layer3 (CC/MM/RR / TS 04.08)
implementations, as they are growing.