Hi DS! > I did solder fine wires (AWG30 probably?) on the back of a C118 phone that > had all the pads connected, allowing be to test the JTAG and UART on this > particular phone.
Were you able to reinsert the regular battery after adding those extra wires, or did you have to implement some more difficult powering arrangement? I am thinking that 30AWG wires are probably thin enough to fit in tiny gaps around the reinserted battery, but what was your experience? > Soldering is not super hard but it requires an iron with > a fine tip. In my case I would ask my friends at Technotronix to do the soldering (I sometimes very rarely do my own soldering, but this case feels like too delicate of a job to me), but the main problem would be time delay: first order 30AWG wires in 3 different colors from Digi-Key, then wait for the parts to arrive, then assemble the crimped end, then schedule a visit to Technotronix for the soldering job... > IIRC that was before FCDEV3B which is much easier to work with > wrt/ JTAG. Yes, I remember you playing a lot with Mot C11x phones before we got FCDEV3B. For newcomers on this list or those who don't remember history, I developed FCDEV3B to provide a replacement for Openmoko's modem. Unlike OsmocomBB folks, I never accepted any of Mot C1xx phones as a primary platform, for me they were always an additional platform to learn from and possibly support to some degree, but never primary. Prior to our own FC hardware (and prior to discovery of Huawei and iWOW modules which came even later than FCDEV3B), my canonical Calypso platform was Openmoko's modem - but the exhausted supply of Openmoko devices made it impossible to share my work with others, and OM's modem wasn't a very convenient development platform either, being tucked away behind the extra layer of an application processor, as opposed to directly accessible. So I designed FCDEV3B as a replacement, and a principal design goal was to make it as close as possible to OM's modem for firmware purposes: our learning of TI's TCS211 platform and the process of taking ownership of it were in the early stages, thus changes needed to be kept to a minimum. JTAG was thrown in on FCDEV3B, copied from TI's Leonardo, because it would have been non-sensical to go through the whole process of building a Calypso dev board starting from just chips, but omit JTAG. My experience with fw development over the years proved very little actual need for JTAG, but it still feels very empowering to be able to take control of the chip at such low level, especially once we figured out how to achieve halt directly out of reset. > I did also solder the UART on at least two C139 phones, it is much easier > than the C1138 JTAG hack since only three wires are needed. I'd be happy > to give you a hand with reading the audio config :-) Take a look in the compal/audio directory in freecalypso-reveng Hg repository, particularly my most recent omr-guide and omr-via-headset articles. The new discovery which I made since my previous post is that we don't need to kill the fw with tfc139 in order to read registers, instead we can send omr commands via rvinterf and fc-tmsh to Compal's running fw, and we can use this omr mechanism to read bits from DSP API RAM. Bits that can be read from DSP API RAM naturally include AEC config and FIR coefficients, but also include Iota VBC register settings which Compal's fw writes in the same manner as TI's reference fw, going through the DSP. The best readouts are obtained if one does these omr sniffs during an active call - thus you would need to boot the UART-equipped C139 phone with a SIM inserted, a SIM that corresponds to an active GSM service with voice call capability. Because you won't be killing the fw with tfc139, only non-invasively reading bits from it with omr commands, it is perfectly safe to boot the phone with a SIM, connect to a GSM network and make a call. Run rvinterf -B57600 on the UART connected to the pads inside the battery compartment, and boot the phone *without* anything inserted into the headset jack. Wait for the running fw to establish a successful GSM network connection, and make sure that there is no headset icon displayed on the home screen. Then make a test call, and while the call is actively connected, run these readout commands: fc-tmsh omr ffd001ec 2 fc-tmsh omr ffd001d6 2 fc-tmsh omr ffd001dc 4 fc-tmsh omr ffd00238 2 fc-tmsh omr ffd0084a 10 fc-tmsh omr ffd00908 3e fc-tmsh omr ffd00946 3e Post the output you get from these omr commands, and I will provide detailed analysis. :-) Hasta la Victoria, Siempre, Mychaela aka The Mother _______________________________________________ Community mailing list [email protected] https://www.freecalypso.org/mailman/listinfo/community
