baseband-devel September 2010

baseband-devel@lists.osmocom.org

10 participants
22 discussions

Receiving on TS=1 ?
by Sylvain Munaut 20 Jul '12

20 Jul '12

Hi, I've hacked something together to quickly test non-combined CCCH. However, I've hit a problem when trying to receive anything on another timeslot than 0. The TX side seems to work fine as the BTS can see my location update request and answers with a reject, but on the MS side, I never see the reject and wireshark only shows invalid incohrent data on the RX. The frames for SDCCH/8 show really nothing valid (looks like random bytes), things like 09 80 7f 47 49 06 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 09 00 47 d5 2d 06 1e 00 00 69 7c a0 91 3d 22 ff ab fe 6c 4f 56 4f 36 ... while the frames for the associated SAACH show at least something gsm-like : 03 03 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b but that's not quite a SI5/6 ... To RX/TX on TS=1, I just delayed the RX/TX window by 625 bits (4 * 156.25) when I'm in dedicated channel mode by chaning the 'start' in l1s_tx_win_ctrl / l1s_rx_win_ctrl Is there something else that should be done ? Cheers, Sylvain

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Use OsmocomBB as OpenBTS / airprobe clock generator
by Harald Welte 15 Mar '12

15 Mar '12

Hi! Recently we've had the idea of using OsmocomBB with a simple firmware that synchronizes to an existing GSM networks FCCH and use the resulting 13MHz clock to drive the USRP for airprobe or OpenBTS. Ideally, we would even use the Calypso-internal PLL (for ARM or DSP) to multiply it up to the required 52 MHz. However, neither the Openmoko nor the Compal/Motorola phones expose any of the 3 clock output pads :( So the only choice is to use something along the lines of the http://focus.ti.com/docs/prod/folders/print/cdcvf25084.html as a quad clock multiplier and attach it to the CLK13OUT signal of the phone. The chip is available for 9 USD in single quantities at digikey, and possibly cheaper at other sources. Combined with a sub-20EUR phone it might be a very cheap but still accurate frequency source for OpenBTS - at least as long as there are any commercial gsm networks available. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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Problems while building osmocomBB
by Begerad Stefan 28 Oct '11

28 Oct '11

Hi guys, I dunno if that is the right place for my concern about building the osmocomBB source. Here is what I already have done: - downloading the sources for osmocomBB and GNU toolchain for ARM, - setting the PATH for the arm-elf-* executables, - calling make in the src directory. Now, this appears as response of the make command in the terminal: cd shared/libosmocore/build-host && ../configure configure: error: cannot find install-sh, install.sh, or shtool in ".." "../.." "../../.." make: *** [shared/libosmocore/build-host/Makefile] Error 1. If you need details about my system, you can look at the following snippet from the config.log file: This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. It was created by libosmocore configure UNKNOWN, which was generated by GNU Autoconf 2.65. Invocation command line was $ ../configure ## --------- ## ## Platform. ## ## --------- ## hostname = ubuntu-stefan uname -m = x86_64 uname -r = 2.6.32-24-generic uname -s = Linux uname -v = #41-Ubuntu SMP Thu Aug 19 01:38:40 UTC 2010 /usr/bin/uname -p = unknown /bin/uname -X = unknown /bin/arch = unknown /usr/bin/arch -k = unknown /usr/convex/getsysinfo = unknown /usr/bin/hostinfo = unknown /bin/machine = unknown /usr/bin/oslevel = unknown /bin/universe = unknown PATH: /usr/local/sbin PATH: /usr/local/bin PATH: /usr/sbin PATH: /usr/bin PATH: /sbin PATH: /bin PATH: /usr/games PATH: /home/stefan/osmocomBB/gnuarm-4.0.2/bin ## ----------- ## ## Core tests. ## ## ----------- ## configure:2032: error: cannot find install-sh, install.sh, or shtool in ".." "../.." "../../..". So, I would be very glad, if someone could give me a hint to solve the problem. Thank you in advance. Regards, begy

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Re: Trouble building Osmocom
by Holger Freyther 26 Jan '11

26 Jan '11

On 06/08/2010 09:41 PM, Huseyin Turan wrote: > root@name1-desktop:/home/name1/osmocom/gnuarm-4.0.2/bin# ls -l arm-elf-gcc > -rwxrwxrwx 1 name1 name1 112344 2006-02-17 23:59 arm-elf-gcc > root@name1-desktop:/home/name1/osmocom/gnuarm-4.0.2/bin# ./arm-elf-gcc > bash: ./arm-elf-gcc: cannot execute binary file > root@name1-desktop:/home/name1/osmocom/gnuarm-4.0.2/bin# uname -a > Linux name1-desktop 2.6.28-19-generic #61-Ubuntu SMP Wed May 26 23:35:15 > UTC 2010 i686 GNU/Linux > please try b.) again (you miss the file part) and also please reply to the mailinglist.

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problem starting out...please help
by Scott Weisman 06 Nov '10

06 Nov '10

Hi All, I now have a V171 phone and cable so I thought I might get started with this. I checked out the code and started make. Osmocon built with no problem, but I got this error next: cd shared/libosmocore/build-target && ../configure \ --host=arm-elf-linux --disable-vty --enable-panic-infloop \ --disable-shared --disable-talloc --disable-tests \ CC="arm-elf-gcc" CFLAGS="-Os -ffunction-sections -I../../../../target/firmware/include" configure: WARNING: if you wanted to set the --build type, don't use --host. If a cross compiler is detected then cross compile mode will be used checking for a BSD-compatible install... /bin/install -c checking whether build environment is sane... yes checking for arm-elf-linux-strip... no checking for strip... strip checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking whether make sets $(MAKE)... (cached) yes checking for arm-elf-linux-gcc... arm-elf-gcc checking whether the C compiler works... no configure: error: in `/mnt/site/osmocom-bb/src/shared/libosmocore/build-target': configure: error: C compiler cannot create executables See `config.log' for more details make: *** [shared/libosmocore/build-target/Makefile] Error 77 Checking config.log I can see it chokes here: /usr/bin/arm-elf-ld: this linker was not configured to use sysroots collect2: ld returned 1 exit status I am running Arch Linux and have the packages cross-arm-elf-binutils and cross-arm-elf-gcc-base installed. Does anyone have any suggestions to fix this? Thanks!

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Re: OsmocomBB.TCH.
by Dieter Spaar 04 Oct '10

04 Oct '10

Hello Marten, First of all please be aware that OsmocomBB is now in a state where it can be used for voice calls without any special tricks so there is no need to tune on the voice traffic of the HP8922 GSM testset, you can use the GSM testset as a normal basestation. On Wed, 29 Sep 2010 23:00:44 +0000, "Marten Christophe" <technosabby(a)gmail.com> wrote: > > Q.1) i learned from wiki how to change ARFCN from Layer on application by > using below command, but how to tune right TS ? > > ./layer23 -a 871 -i 127.0.0.1 For my inital TCH testing I did not use Layer23 at all, I only used Layer1 in the phone with special test code using a fixed ARFCN. > Q.2) even If OsmocomBB Layer1 CTL is able to tune to right ARFCN and Time > Slot, will i be able to listen what so ever broadcasting from HP8922 from > C123 speaker or PC speaker. non-encrypted, debugging non-hopping) Yes. > Q.3) what command and interface will be used to enter the frequency hoping > parameter, in case i will use FH option? to tune OsmocomBB l1CTL You have to write your one code if you want to do this without Signalling beeing involved. > Q.4) How to enter Minimalistic L1 interface, what is interface available to > insert theses command to layer1 You can use the L1CTL API to setup a TCH with your own code, but its probably easier to setup the TCH with signalling (either MOC or MTC), this way you don't need to modify the code and still get the TCH running. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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OsmocomBB.TCH.
by Marten Christophe 30 Sep '10

30 Sep '10

Hello, Thanks u all this gr8.. work .. forgive me for my little novice question.. most probably goes to Mr. Deiter.. but any one from list be kind enough help me from list.. I'm pretty new to Osmocombb i made a setup as advised on *Sun, 01 Aug 2010* blog. with hp8922. ===Q=== " You just "tune" to the right ARFCN and time slot (I don't use hopping during testing) and see that you get your code running." ===UQ== Q.1) i learned from wiki how to change ARFCN from Layer on application by using below command, but how to tune right TS ? ./layer23 -a 871 -i 127.0.0.1 Q.2) even If OsmocomBB Layer1 CTL is able to tune to right ARFCN and Time Slot, will i be able to listen what so ever broadcasting from HP8922 from C123 speaker or PC speaker. non-encrypted, debugging non-hopping) Q.3) what command and interface will be used to enter the frequency hoping parameter, in case i will use FH option? to tune OsmocomBB l1CTL Q.4) How to enter Minimalistic L1 interface, what is interface available to insert theses command to layer1 DEDIC_MODE_EST_REQ , LAYER1_RESET, DEDIC_MODE_DATA_IND thanks , Martin

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(no subject)
by Marten Christophe 30 Sep '10

30 Sep '10

Hello, Thanks u all this gr8.. work .. forgive me for my little novice question.. most probably goes to Mr. Deiter.. but any one from list be kind enough help me from list.. I'm pretty new to Osmocombb i made a setup as advised on Sun, 01 Aug 2010 blog. with hp8922. ===Q=== " You just "tune" to the right ARFCN and time slot (I don't use hopping during testing) and see that you get your code running." ===UQ== Q.1) i learned from wiki how to change ARFCN from Layer on application by using below command, but how to tune right TS ? ./layer23 -a 871 -i 127.0.0.1 Q.2) even If OsmocomBB Layer1 CTL is able to tune to right ARFCN and Time Slot, will i be able to listen what so ever broadcasting from HP8922 from C123 speaker or PC speaker. non-encrypted, debugging non-hopping) Q.3) what command and interface will be used to enter the frequency hoping parameter, in case i will use FH option? to tune OsmocomBB l1CTL Q.4) How to enter Minimalistic L1 interface, what is interface available to insert theses command to layer1 DEDIC_MODE_EST_REQ , LAYER1_RESET, DEDIC_MODE_DATA_IND thanks , Martin

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Presenting at event.
by Andrew Back 24 Sep '10

24 Sep '10

Hello, I'm involved with an open source hardware user group based in London: http://oshug.org Our next meeting is on Thursday 21st October and for which the theme is radio. We have one confirmed speaker who will be presenting on OpenHPSDR, and wondered if there might be someone around London at that time who might be willing to do a presentation on OsmocomBB and/or OpenBSC. For more info on OSHUG see the website for details of previous talks and photos and video. Regards, Andrew -- Andrew Back mailto:arback@gmail.com

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Suggestions regarding the SIM code
by Harald Welte 23 Sep '10

23 Sep '10

Hi! I just found some time to have a look at the recent commit history and had a look at the SIM related code and had the following suggestions: 1) split the definitions from GSM TS 11.11 into a separate header file from the definitions that are OsmocomBB specific, and move the 11.11 header file into libosmocore 2) use msgb's for SIM messages. This way we can avoid all those manual buffer[N] = M type assignments and rather use msgb_put() constructs 3) even if not going for suggestion '2', it might be good to add some kind of a inline function abstracting out all the blocks that look like + buffer[0] = GSM1111_CLASS_GSM; + buffer[1] = GSM1111_INST_TERMINAL_PROFILE; + buffer[2] = 0x00; + buffer[3] = 0x00; + buffer[4] = length; with something like a "sim_buf_init(buffer, GSM11_INST_TERMINAL_PROFILE);" Of course those are simply suggestions... maybe for the day where somebody on this list is feeling bored and is looking for a quick and easy task to resolve. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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baseband-devel September 2010