[chirp_devel] Baofeng - Programming specific RDA1846 codes via Chirp possible?

[David Ranch]

Hey Dan,

Thanks for the clear explanation!

--David


On 09/13/2015 09:28 AM, Dan Smith wrote:
>> Ok, thanks for the confirmation on what Chirp does today.  I am curious
>> though if what Chirp downloads as an img from the radio is the complete
>> radio image?  If it is a complete image yet it only modifies the
>> channel/freq/features areas, there still might be some hope that
>> someday, a "very advanced" area could be added to flip these specific bits.
> I think you're probably misunderstanding how these devices are laid out.
> Most of these single-chip radios are laid out with the following components:
>
> 1. A CPU, with some non-volatile firmware
> 2. An eeprom or flash memory array
> 3. The single-chip radio
>
>                 firmware
>                     ^
>                     |
>      flash <-----> CPU <-----> radio
>                     |
>                 serial port
>                     |
>                  computer
>
> The programming mode we have access to merely uploads and downloads
> ranges from #2. We don't get to access or change the firmware bit, and
> we certainly don't get to talk to the radio chip directly. The CPU could
> load some settings from the memory array and program the radio chip at
> startup, but I think it's unlikely. If it does, it would be pretty
> difficult to find this without some help or documentation. Regardless,
> it would be limited to whatever settings and values the firmware is
> designed to program the radio with. When we're in programming mode, we
> just have two commands: "write $blob to location $foo" and "read
> location $foo". The "image" we download is merely "every memory location
> from zero to end".
>
>> While I'm at it, I'm curious what people think about this specific 9600
>> baud hack that this HAM did.  In an analog radio, one would need to tap
>> into the discriminator to get a wide enough & flat pass
>> band to support FSK over FM.  Since these Baofeng radios are SDRs and
>> pack everything into a few ASICs, I don't know if getting into this
>> stage of the radio block is required anymore.
> This is pretty off-topic for this list, so you should probably take it
> elsewhere.

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