[chirp_devel] Kenwood TH-D74A MCP mode is proving to be a pain

[Eric A. Cottrell]

On 12/7/2017 2:40 PM, Eric Wolak via chirp_devel wrote:
> Hello fellow CHIRP contributors,
>
> I'm working on CHIRP support for the Kenwood TH-D74A, and it's turning
> out to be far more difficult than I expected. The memory layout is
> straightforward enough, but the serial protocol seems to have some
> quirks to it. I'm pretty sure my code is having the same exchange as
> the Kenwood MCP software is with the radio, but when CHIRP uploads to
> the radio it glitches at page 1280 and the radio factory resets. It
> also sometimes glitches at the beginning of the upload, though I
> haven't been able to isolate and reproduce that yet.
>
> Does anybody have ideas for what I might be missing here, or what I
> should investigate? I'm reduced at this point to writing a tool that
> replays sessions recorded using Device Monitoring Studio (and the
> replay works), and then diffing it against what CHIRP is doing. Is
> there some more well-trodden path for doing this sort of protocol
> comparison?
>
>
>
> https://chirp.danplanet.com/issues/4129
>
Hello,

I tried out the code you posted and only occasionally did my TH-D74 go 
into clone mode. Most of the time it turned off. I used RealTerm to 
experiment and got the same result. I dropped the baud rate down to 
57600 and it got into clone more often. 38400 seemed solid.

I edited the baud rate in your code to 38400. The radio went into clone 
mode and downloaded. At the end I got an exception.
C:\Projects\Radio\CHIRP>python chirpw
Exception in thread Thread-2:
Traceback (most recent call last):
   File "C:\Python27\lib\threading.py", line 801, in __bootstrap_inner
     self.run()
   File "C:\Projects\Radio\CHIRP\chirp\ui\clone.py", line 260, in run
     self.__radio.pipe.close()
AttributeError: 'SProxy' object has no attribute 'close'

I suspect the high baudrate is causing overruns and the radio powers off.

73 Eric
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