Closed aeickho closed 8 years ago
I just added an S003.012.bin firmware for older GPS radios in 4bc9727c5fc118047d0b55c468441107176b60c3. A vbindiff between this firmware and the S013.012 firmware shows that they are very similar; I'd probably poke at these to see what they changed with the new "vocoder"; perhaps using radiff2 and comparing changed procedures.
With the new symbol migration tool, we can see that S013.012 does lack the ambe_encode_thing() and ambe_decode_wav() functions that are easily identified in S003.012. They do use different vocoders!
S03.012 (old vocoder)
/* Unknown AMBE2+ thing. */
ambe_encode_thing = 0x08053d99; /* 1024 byte match */
/* Decodes an AMBE2+ frame into bits. */
ambe_unpack = 0x0804b979; /* 38 byte match */
/* Populates the audio buffer */
ambe_decode_wav = 0x08054251; /* 504 byte match */
S13.012 (new vocoder)
/* Unknown AMBE2+ thing. */
/* ambe_encode_thing has bad match of 4 points at 0x0802baf9*/
/* Decodes an AMBE2+ frame into bits. */
ambe_unpack = 0x0804be29; /* 38 byte match */
/* Populates the audio buffer */
/* ambe_decode_wav has bad match of 2 points at 0x0800e399*/
You can try the tool yourself with make clean all
in symbols/
. All matches are made against the 2.032 firmware.
Updated my last comment now that the tool is printing the destination addresses. Before it was printing the source addresses, which were quite a bit less useful.
I have this new radio and am willing to beta test the firmware updates if you like. I have the original firmware so I can recover if I need to.
Update - I have been able to successfully install the firmware on my radio with the new vocoder. Everything is working fine.
@aeickho Shall we close this issue, now that we have compatibility of each vocoder on the other's hardware?
my related question was ... what is difference between the too vocoder ... the not alpu relevant part
ok i think the question is to "complicated" ... I'll close
on http://blog.retevis.com/firmware-update-rt3-rt8/ is an note about a "new Vocoder".
Let us collect here what changes in the vocoder have been made.
Close this Issue when the "improvement" is documented :laughing: