baseband-devel

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2022 discussions

Decoding AMR
by Bhaskar11 31 Jan '13

31 Jan '13

I've been experimenting with decoding AMR in burst_ind with the following steps: 1. Ignore SACCH and UL frames 2. check for FACCH 3. check for CMI/CMR (only on specific frame numbers) and change codec if necessary after 12 frames 4. check for RATSCCH, if necessary change codec after 12 frames Can anyone confirm that this is the proper process? I've looked at Bob's code of July 2012. It does not use the above checks which may be the reason for its failure. B. ===================== From: bob <avwiseav <at> gmail.com> Subject: is my patch for capturing TCH frame correctly?<http://news.gmane.org/find-root.php?message_id=%3c1342688308441%2d4025199.p…> Newsgroups: gmane.comp.mobile.osmocom.baseband.devel<http://news.gmane.org/gmane.comp.mobile.osmocom.baseband.devel> Date: 2012-07-19 08:58:28 GMT (27 weeks, 6 days, 20 hours and 14 minutes ago) Hi, everyone interesting the topic, this is my latest patch for TCH decode, fix few bug; but it not work well for TCH AMR decode, welcome everyone interesting it to review it and modify it! the most problem now I think is the capture of the Correct TCH frame, at the last ,there is some output for analysis --- app_ccch_scan.c 2012-03-14 16:08:11.305112000 +0800 +++ new_app_ccch_scan.c 2012-07-19 15:32:31.945314000 +0800 <at> <at> -50,20 +50,80 <at> <at> #include <l1ctl_proto.h> #include <osmocom/bb/misc/xcch.h> +#include <codec.h> +#include "conv_tch_afs.h" +//#include "../openbtsstuff/GSML1FEC.h" +//extern bool TCHFACCHL1Decoder::processBurst( const RxBurst& inBurst); +//const struct osmo_conv_code conv_tch_afs_12_2; +extern FILE *log_tmsi; extern struct gsmtap_inst *gsmtap_inst; +FILE *d_speech_file; +const unsigned char amr_nb_magic[6] = { 0x23, 0x21, 0x41, 0x4d, 0x52, 0x0a }; +

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Help with JTAG
by teslarode＠yahoo.com 31 Jan '13

31 Jan '13

Hello, I've found a very interesting article about SciphoneDream G2 published on your webpage at http://bb.osmocom.org/trac/wiki/SciphoneDreamG2 that covers pretty detailed information about MT6235 SoC, bootstrapping as well as JTAG. This is the only article I have ever found on internet about MTK SoC and JTAG. What I am trying to accomplish is to access NAND flash and write to it over JTAG (in order to recover from corruption after bad flash) on MTK8555 SoC which according to my in-depth research and analysis has very similar architecture to MT6235. If I can't write to NAND over JTAG but would be able to launch u-boot that would be a solution too. I am very good at ARM assembly and debugging, however I am not very experienced with JTAG. Do you think you (or anyone else) could help me out, by giving me guidance what hardware, software, config files should I use to make JTAG work on this SoC ? Any help or advise would be more then appreciated! If you are a wrong person I contacted, I apologize for the inconvenience. Many thanks in advance! Dwayne

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Mistake in gsm_04_08.h channel mode definition
by Bhaskar11 30 Jan '13

30 Jan '13

In enum gsm48_chan_mode definitions we have: GSM48_CMODE_DATA_3k6 = 0x23, It should be 0x13 as in 3GPP TS 04.08 / 10.5.2.6. Please update in repository.

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thanks for osmocom, my goals, available to test c139 & c115
by Craig Comstock 30 Jan '13

30 Jan '13

Hi, I have bought two phones... Motorola C139 and Motorola C115. I'm using the raspberry PI UART instead of a dedicated cable and got the hello world example working just fine on the C115. My goal is to have a usable open source phone which I see there is a bit of a start at in the source code. I've been working on getting debian on my Motorola Defy for a while and am making some progress. Since I have two phones... I am certainly willing to help in testing things. I can't promise a lot of time but I can hope to help a little. Thanks for your efforts, Craig Comstock Lawrence, KS

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another method for filter rework
by Akib Sayyed 26 Jan '13

26 Jan '13

Dear sylvain I checked on your website you gave some other way of doing filter rework. I checked tried to check problem n checked possible shorts. but multi meter shows all part are shorted. also checked each components but it shows that there is direct connection in between all points of baluns. i would like to try other way for same -- Akib Sayyed Matrix-Shell akibsayyed(a)gmail.com akibsayyed(a)matrixshell.com Mob:- +91-966-514-2243

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Dumping DSP
by Akib Sayyed 25 Jan '13

25 Jan '13

Dear list i see there is target_dsp firmware. as per readme found inside it dumps dsp data on console. but i am unable to compile. it needs tic54x-coff but couldnt find it. can any one guide me through this. -- Akib Sayyed Matrix-Shell akibsayyed(a)gmail.com akibsayyed(a)matrixshell.com Mob:- +91-966-514-2243

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Implementing AMR Codec for Mobile App
by Akib Sayyed 25 Jan '13

25 Jan '13

Dear All Currently i am trying to implement AMR codec for Mobile App. Please guide me for same. I am not that good in channel decoding. if anyone have given a try or have partial code implementation please help me in that. -- Akib Sayyed Matrix-Shell akibsayyed(a)gmail.com akibsayyed(a)matrixshell.com Mob:- +91-966-514-2243

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Some beginner questions and comments
by Klaus Darilion 25 Jan '13

25 Jan '13

Hi! First I do not know if this is the proper mailing lists, as I am not a developer but a user. But I couldn't find a user list. So please advice if there is a better list. I started playing with Osmocom and my "brand new" C118 :-) and meanwhile I made my first open source GSM phone call. Following is my list of questions and suggestions I experienced so far: - Build System: since the "Use the system wide libosmocore for host applications" commit it is required that libosmocore is built separately. But the documentation is still confusing. Thus I think it would be good to: - remove the libosmocore subtree git from osmocom-bb git - remove this line of text from http://bb.osmocom.org/trac/wiki/libosmocore: "When you download and build OsmocomBB, then libosmocore is automatically part of the package, no special action is required." - osmocom: some wiki pages refer to an "osmocom" application. Is there an osmocom binary? (I think most times it is a typo for osmocon) - I use Wireshark to capture the GSMTAP packets of "monitor". How do I find out in the Wireshark trace if a message is sent from the MS or is received by the MS? - I want to study the high layer messages (e.g. not cell selection but call setup, registering to the network) but I am lost in the debug flags: DCS:DNB:DPLMN:DRR:DMM:DSIM:DCC:DMNCC:DSS:DLSMS:DPAG:DSUM. Which ones are needed in my case? Is there somewhere a description of the flags? - Some tools (e.g. cell_log) give 'SAP' log messages, e.g: Failed to connect to '/tmp/osmocom_sap'. Failed during sap_open(), no SIM reader I suspect this is for communcation with SIM cards. How it is supposed to work? - Is this 'SAP' stuff only needed/useful for softSIMs? - Which application should create the /tmp/osmocom_sap socket? (osmocon only creates /tmp/osmocom_l2 and /tmp/osmocom_loader) - Would it be possible to remove the SIM card from my C118 and put it in an external SIM reader, and then let "mobile" use the SIM card in the external reader instead? Thanks Klaus PS: I'm willing to improve the documentation in the wiki with your answers ;-)

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Need instructions
by Akib Sayyed 23 Jan '13

23 Jan '13

Dear All I need instructions for flashing c155 with custom firmware. also i need to build linker script too.what all changes need to be done in flash.lds for e88 hw. will changes in only address and size part will work ?? can any one help me ?? -- Akib Sayyed Matrix-Shell akibsayyed(a)gmail.com akibsayyed(a)matrixshell.com Mob:- +91-966-514-2243

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slow osmocom website
by Klaus Darilion 23 Jan '13

23 Jan '13

Hi! The last days I experienced the website is sometimes very slow. Requests takes up to 30 seconds to be answered by the server. http://bb.osmocom.org/ is fast, but http://bb.osmocom.org/trac/ is slow. Thus I suspect a Trac or database problem. regards Klaus

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