baseband-devel

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2002 discussions

Re: osmocombb project does not work with any cable
by Craig Comstock 11 Jul '24

11 Jul '24

Hi there, You have to give these things some time. There are some good notes of expected behavior and bytes here: https://osmocom.org/projects/baseband/wiki/CompalRamloader -Craig On July 9, 2024 1:35:27 PM CDT, "حمۆدِيَ M" <jafar.jjjh63(a)gmail.com> wrote: >Hello . Please answer me, I have cp2102, FT232RL, and DSD TECH USB RS232 to >3.5mm Serial Cable with FTDI FT232RL Chip 6FT. >I have a conversion from 2.5mm to 3.5mm, but it does not work at all. But >in the cp2102 and FT232RL it works, but not completely, as it receives data >without sending the firmware download. What is the solution ? This is an >attached file that shows how to connect the phone with the CP2102 and >Ft232RL modules, and another picture showing what results appear to me. >Please reply to get the answer on how to send the firmware download >successfully! >For your information, I have 3 Motorola devices, C118, C115, and C139. They >all have the same result

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In search of broken Calypso phone
by Alexander Huemer 05 Jun '24

05 Jun '24

Hi I am on the hunt for a Calypso phone that isn't functional for whatever reason for the purpose of de-capping and photographing the Calypso/Iota/Rita ICs that a friendly individual would be able to do. This isn't something important, but the pictures would definitely be entertaining to look at. Of course somebody could donate a working phone to the cause, including myself, but a specimen that doesn't serve any other purpose anymore would be ideal. If you are in possession of such a phone, please let me know. Thanks, -Alex^Wblackbit

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How to add gdb info when build mobile and trx? Thank you!
by hellowangfang＠gmail.com 29 Mar '24

29 Mar '24

I used mobile, trx,grgsm,sdr to connect to openBTS, still failed. I want to use gdb to trace the internal info, how to enable gdb info when build them? Thank.

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by williammores96＠gmail.com 17 Mar '24

17 Mar '24

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pycrate repo update
by benoit michau 02 Mar '24

02 Mar '24

Dear osmocom developpers, This is just to let you know that the Python library pycrate has a new home : https://github.com/pycrate-org/pycrate. The packages on Pypi are now feeded from there. This library can be used in many cases dealing with mobile signalling. I wanted to let you know, as even if I am not aware of any osmocom projects depending on it, some of you may use the library from time to time, or could have local applications depending on it. Best Regards Benoit

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Please Read and Support Compilation error in OSMOCOM BB
by Neeraj Chaudhary 27 Feb '24

27 Feb '24

Hello Team, I hope you are well and good . While I am doing the compilation of osmocom BB , There are errors as following , I committed the "Hello world" in the Makefile then there was another error and it kept coming one after another after I did the commit . Please note I have installed all the pre-requisites , GnuARM ToolChain and Libsomocomcore as directed in document . Also I have tried on both Ubuntu 20 and 22 but still the error keep coming . Please let me know for any know solutions for the same and also let me know if you need some more information from myside . Advance thanks for your support and all this good work . comm/timer.c: In function ‘timer_irq’: comm/timer.c:184: warning: unused parameter ‘irq’ AR comm/libcomm.a CC tiffs/globals.o CC tiffs/init.o CC tiffs/readfile.o AR tiffs/libtiffs.a LD board/compal_e88/hello_world.compalram.elf arm-elf-gcc: board/compal_e88/hello_world.compalram.map: No such file or directory make[1]: *** [Makefile.inc:139: board/compal_e88/hello_world.compalram.elf] Error 1 make[1]: Leaving directory '/home/lab3/osmocom-bb/src/target/firmware' make: *** [Makefile:100: firmware] Error 2 BR// Niraj Kumar

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Please Read and Support Compilation error in OSMOCOM BB
by Neeraj Chaudhary 05 Feb '24

05 Feb '24

Hello Team, I hope you are well and good . While I am doing the compilation of osmocom BB , There are errors as following , I committed the "Hello world" in the Makefile then there was another error and it kept coming one after another after I did the commit . Please note I have installed all the prerequisites , GnuARM ToolChain and Libsomocomcore as directed in document . Also I have tried on both Ubuntu 20 and 22 but still the error keep coming . Please let me know for any know solutions for the same and also let me know if you need some more information from myside . Advance thanks for your support and all this good work . comm/timer.c: In function ‘timer_irq’: comm/timer.c:184: warning: unused parameter ‘irq’ AR comm/libcomm.a CC tiffs/globals.o CC tiffs/init.o CC tiffs/readfile.o AR tiffs/libtiffs.a LD board/compal_e88/hello_world.compalram.elf arm-elf-gcc: board/compal_e88/hello_world.compalram.map: No such file or directory make[1]: *** [Makefile.inc:139: board/compal_e88/hello_world.compalram.elf] Error 1 make[1]: Leaving directory '/home/lab3/osmocom-bb/src/target/firmware' make: *** [Makefile:100: firmware] Error 2 BR// Niraj Kumar

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Does anyone from the community want the airprobe.org domain?
by Harald Welte 24 Jan '24

24 Jan '24

Hi all, I was approached by the person currently holding the [unused] airprobe.org domain name. I guess it was at some point registered and intended to be used for the project (back in the pre-osmocom days). As far as I know it was never actually used for that. So the question is now if anyone wants to get that domain transferred in order to do something useful with it, or whether the current registrant should simply let it expire? Regards, Harald -- - Harald Welte <laforge(a)osmocom.org> https://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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OsmoDevCall on Nov 15, 2023: Calypso history: From TI to FreeCalypso to USA PSTN
by Harald Welte 15 Nov '23

15 Nov '23

Dear Osmocom community, we're happy to announce the next incarnation of OsmoDevCall. when: (today) November 15, 2023 at 20:00 CET where: https://osmocom.org/OsmoDevCall (Big Blue Button) This time, @falconia will be presenting on Calypso chipset history and development boards, from TI to FreeCalypso This meeting will have the following schedule: 20:00 meet + greet 20:10 topic as outlined above 21:00 unstructured supplementary social event [*] Attendance is free of charge and open to anyone with an interest in Osmocom or open source cellular technologies. More information about OsmoDevCall, including the schedule for further upcoming events can be found at https://osmocom.org/projects/osmo-dev-con/wiki/OsmoDevCall Looking forward to meeting you soon! Best regards, Harald [*] this is how we started to call the "unstructured" part of osmocom developer conferences in the past, basically where anyone can talk about anything, no formal schedule or structure. -- - Harald Welte <laforge(a)osmocom.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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Powering GSM MS from USB
by Mychaela Falconia 08 Nov '23

08 Nov '23

Hello fellow GSM MS tinkerers, Question: is there anyone on either ML who has any experience with powering a GSM MS from USB, or had at least thought about this problem? We all know the fundamental problem: during Tx bursts the PA in a GSM MS can suck as much as 2 A, but the current budget of a classic USB port is only 500 mA. However, that 2 A current draw has a duty cycle of 1/8 of a TDMA frame, and the total energy transfer with 1/8 duty cycle bursts of 2 A (at a given voltage) is equivalent to 250 mA continuous draw - and the latter number is well within the range of what a PC/laptop USB host port can supply. Context: I am looking into the possibility of building a new GSM MS board that would be just a little better than the one in OS#4030. The goal is to produce a low-cost modem-only (no UI as in LCD etc, host computer required for control) GSM MS using a pre-existing packaged Calypso module (FC Tango, similar to GTM900, but a little better) with a built-in USB adapter for the two Calypso UARTs - very similar goals to OS#4030, but design it in such a way that will be suitable for both firmware tastes, rather than OBB-only. My initial thought was to require a separate non-USB supply for the GSM side of this board, leaving USB power only for the FT2232H block. This approach is not a problem from the perspective of cost - I already have a large stock of 3.6V 2.2A power supply bricks that were specifically made for powering FreeCalypso dev boards, hence the least-effort and least-cost approach would be to simply include one of these AC-to-3.6V adapters with each board and be done with it. But use convenience does suffer with this approach: in addition to connecting the GSM MS board to her PC/laptop with a USB cable, the user would also have to connect the separate 3.6V power supply (and have a spare AC power outlet for it) in order to bring the GSM MS to life. The whole arrangement would be much more convenient for the user if she only needs to connect USB from her PC/laptop to the board and that's it - have this USB supply power to the GSM MS and carry the two ttyUSB channels for Calypso UARTs. But how to design it in hw so that it will work correctly is the question. My first thought in this direction is to implement a step-down regulator (ideally a switcher, but linear may be OK too) from 5V down to 3.5V as the first order of business, and then somehow deal with 2 A current spikes on the 3.5V rail. Why 3.5V? Every power consumer inside a Calypso+Iota+Rita module either uses actual LDO linear regulators (Iota and Rita) or behaves (power-wise) in the manner of a linear regulator (RF PA), thus one could actually feed 5V directly to the VBAT input of such module - but this design would shorten the longevity of components through higher heat dissipation inside Iota, Rita and PA chips. If we stick a linear regulator down to 3.5V somewhere between USB 5V power input and VBAT rail to the Calypso module, the overall current and power consumption profile stays exactly the same, but a big chunk of heat dissipation moves from delicate RF components to that external 3.5V regulator, which can have a proper heat sink. (The specific choice of 3.5V number is rather arbitrary - the idea is to make it as low as possible while staying within safe margins of "good battery" voltage.) And if we make that 5V to 3.5V regulator a switcher instead of linear, we'll have a little less current drawn from the USB host for the same current into VBAT GSM domain. But what would be the right way to support 2 A current spikes during GSM Tx bursts? I reason that a large capacitor will need to be placed on the output of the 3.5V step-down regulator, one that will store enough energy to feed the PA during that hungry burst - any thoughts as to which type and size of capacitor would be most appropriate here? And the most important question, for people with more EE experience than me, and/or people who have already considered this problem: is this capacitor solution expected to work, or is the problem intractable in the sense that a USB-powered GSM MS, with the USB host limiting to 500 mA, will never be able to produce proper GSM Tx bursts at max power without tripping overcurrent shutdown on the USB host port? I would greatly appreciate some feedback on these ideas. M~ P.S. Suggestions to move to USB Type C and USB-PD won't be helpful - the dev board MUST be usable with traditional PC/laptop USB host ports that max out at 500 mA and never switch from 5V to any other voltage.

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