baseband-devel October 2013

baseband-devel@lists.osmocom.org

14 participants
24 discussions

OT: Repeater for Sprint Network
by Jeffrey Walton 16 Oct '13

16 Oct '13

Hi All, Please forgive me for the off-topic post. My cell service is so bad at the house I can't hold it in any longer. Does anyone have a recommendation for a repeater of the Sprint network? I'd like a low power omni for the house, and a directional back to the tower. (Or some step-by-step instructions for building one?) I'm less interested in a Femtocell because I have about an acre of land, and I'd like to get some coverage in the back yard too. For completeness, I have an iPhone and EVO 4G. So I would like 800 ESMR, 1900 PCS, and 2500 WiMax, if possible. Thanks in advance and sorry about wandering a bit.

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Looking for Leonardo+ PCB layout
by msokolov＠ivan.Harhan.ORG 15 Oct '13

15 Oct '13

As I wrote here two months ago, I am seeking to build my own totally free, end-user-usable Calypso-based quad-band GSM plain phone, as well as possibly a Calypso-based free GSM modem module for smartphone projects done by others, such as this: http://talk.maemo.org/showthread.php?p=1376708 I already have the Calypso etc chips in qty 100 sitting in my desk drawer - buying them on the Chinese surplus market turned out to be surprisingly easy, and they most definitely have quite a bit more of them available than the 100 I have bought. Making my GSM device(s) quad-band as in 850/900/1800/1900 MHz is an important part of my goal - contrast with the current OsmocomBB- supported devices, which are only dual-band or tri-band at best. My belief in the idea that our familiar Calypso/Iota/Rita chipset is capable of supporting the quad-band configuration stems from the existence of this TI reference design: ftp://ftp.ifctf.org/pub/GSM/Calypso/Leonardo_plus_RD122.pdf ftp://ftp.ifctf.org/pub/GSM/Calypso/Leonardo_plus_quadband_schem.pdf ftp://ftp.ifctf.org/pub/GSM/Calypso/M034F.pdf The first PDF is something I just found on 52rd.com 2 days ago: it has the Leonardo+ quad-band schematics plus a component placement drawing. The 2nd PDF is the schematic which we have had for 2y now (might be a very slightly different version, haven't visually diffed the two closely enough) and the last PDF is for the quad-band RF FEM they used, all from 52rd.com. What I am still missing is a copy of the PCB layout (in whatever format TI used for their reference designs all those years ago) corresponding to those schematics. I have not yet found that article in my trawls through 52rd.com - that's a search for a needle in a giant haystack. (We also have a Leonardo_rev05.dsn file, in the same directory as the ones listed above, but I assume it's the EDA source file for the schematic capture phase only, no layout.) I have already found a layout for a dual-band phone on an 8-layer PCB: ftp://ftp.ifctf.org/pub/GSM/PCB/unknown-phone-pcb1.zip and I can probably find a layout for a tri-band phone on an 8-layer PCB too, something like Pirelli DP-L10. In contrast, Leonardo+ is a very elegant quad-band design, and this TI doc says it's only a 6-layer PCB: ftp://ftp.ifctf.org/pub/GSM/Calypso/chipsets+refdesigns.pdf (see page 10) We also have this: http://scottn.us/downloads/peek/HW%20doc/I-Sample%20ref.%20design/Full%20pa… I-sample is TI's LoCosto board, and it is quad-band. But LoCosto's built-in RF block has separate LNA inputs for 850 and 900 MHz unlike Rita, and I-sample uses a weird arrangement: the PA and the antenna switch are integrated into one, but the Rx SAW filters are discrete. So it isn't the same as Leonardo+. Thus I am putting out this loud call for anyone who may have found a copy of the Leonardo+ PCB layout somewhere on 52rd.com or some other site of a similar nature. If you have a copy of this PCB layout or know of a place where it can be downloaded, please speak up! By helping me obtain a copy of that PCB layout, you would be helping not only me, but also all those end users who would appreciate having a quad-band GSM plain phone (or a modem for Neo900 etc) that is fully documented and capable of running 100% free baseband firmware. TIA, SF

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l1ctl_tx_fbsb_req
by Erich Dachleger 15 Oct '13

15 Oct '13

Hi list, Sometimes when I run ./mobile -i 127.0.0.1, after output as below -------excerpt---------------- <000b> gsm48_rr.c:2174 PAGING REQUEST 1 <000b> gsm48_rr.c:2132 TMSI ***** (not for us) <0001> gsm48_rr.c:2450 IMMEDIATE ASSIGNMENT: <0001> gsm48_rr.c:2462 (ta 30/16615m ra 0x7f chan_nr 0x0e MAIO 0 HSN 38 TS 6 SS 0 TSC 4) <0001> gsm48_rr.c:2478 Not for us, no request. <000b> gsm48_rr.c:2174 PAGING REQUEST 1 -----execerpt-end---------------------------------- I then want to launch ccch_scan, after calling the function l1ctl_tx_fbsb_req,with the from mobile obtained parameters, similar to what Bhaskar did here: http://lists.osmocom.org/pipermail/baseband-devel/2013-February/003799.html But how and from where did Bhaskar call l1ctl_tx_fbsb_req function? Via netcat or socat to the osmocom-socket? Regards erich

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bad crc when trying to flash application
by Andreas 02 Oct '13

02 Oct '13

Hello, I have problems flashing applications to the motorola c123. I tried it with several phones. Booting and running applications via USB is working well, but unfortunately flashing does not work. Following both of the tutorials (flashing and flashing_new) the command "host/osmocon/osmoload fprogram 0 0x010000 compal_loader.bin" outputs: Loading 8192 bytes of memory at 0x10000 in chip 0 from file compal_loader.bin bad crc 9bf1 (not e0bc) at offset 0x00000000 status 5242976, aborting The memdump-command seems to work - I get a file compal_loader.bin with an md5sum of f59dee5a67b4114251acd0d279eacd85. The "funlock" and "erase"-command seemed to be successful, according to the output of osmocom ("Unlocking block at 0x00010000, meaning 00010000", "Erasing block 0x00010000...done") and the fact, that the original firmware does not load anymore, when erased :-) I am using debian 6.0 (32bit) with a cross-compile-environment setup as described on http://bb.osmocom.org/trac/wiki/GnuArmToolchain to compile osmocom. The libosmocore has Patch 5b6416a729b46aab8ac7ea25a7ec91f3afeaf4fc (latest master-Branch), but I am using commit f2ab5e14967426f4845b51def4d9105af22f9ad2 from the master-branch of osmocom, because with the latest version of osmocom, the phones would not boot - I get only an output of "got 2 bytes from modem, data looks like: 04 81 ..", then osmocom exits. The motorola c123 is connected via USB-Hub and an CP2102-Cable I got from sysmocom. Could anybody please give me a where the error is or what else I can try to solve the problem. Thanks for help. greetings, Andreas

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baseband-devel October 2013