[chirp_devel] Getting copy of written serial data upon read

[kc9uum]

Hi all,

I'm working on adding support for a new radio, the Ritron RTX-450. It's a
commercial radio, but with a bit of VCO tinkering works in the ham bands.

I started with template.py, and use uv5r.py as a reference, since I have
one of those as well. So far, I've mapped out the memory and established
communication with the radio, but I'm having a problem when I read the
data.  To establish communication, I first send a series of "?", followed
by a "G". As soon as the radio receives the G, it starts sending data.
What's happening in chirp, though, is when I do the serial.read(1), I'm
getting the sent data back and then the radio data, as if the buffer
doesn't clear. This uses an Icom OPC-478 style cable, where RX and TX are
simply wire-OR'd together, so that does make sense. I should mention that
this cable works fine with the OE software. Do I just need to look for the
sent string in the response and filter it out, or is there a better way to
handle this? I tried inserting serial.flush() after serial.write("G"), but
when stepping through the program that seemed to do nothing.

/Ben
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