--- In "Jon L" <> wrote:
>
> Ok, I finally got an RS232 uart to work properly on the TS-7500 (the fpga
> program needed to be upgraded to revision x03)
>
> but whats interesting is the RX buffer of the uart fills so long as data is
> coming in and queues up.
>
> So what is the best way to dump this data for the freshest? For example say
> I have a GPS hooked up to a uart, and its constantly spewing data which I
> don't care about. Now say all of a sudden I want the next gps data; I don't
> want wade through the entire /dev/gpsuart file to get to the last data; I
> want to be able to reset /dev/gpsuart, and have it fill fresh when I want it.
>
>
> Any ideas?
>
>
>
> Also what happens if I ignore the Gps data for a loooong time, what is the
> buffer limit on the /dev/gpsuart as set up by
>
> xuartctl ???
>
ok, I hooked up my GPS to the /dev/gpsuart and it receives the data just fine,
but the problem is the queueing of the data.
If I ignore the RX for minutes, the buffer fills to around 12,285 bytes (any
Idea the significance of this amount?) That is fine but if I dump the buffer
with say "cat /dev/gpsuart >/dev/null" It seems that I just get the next
section of gps data. There is still a hidden queue of the data somewhere
queuing up rather than dumping on the floor.
I tried "tail /dev/gpsuart" but that only gives me the "tail" of the 12,285
section. I was hoping that tail would move the pointer to the end of
everything. The only thing I've gotten to work so far is if I:
"tail -f /dev/gpsuart" then wait xxx seconds until I see the data streaming
(much slower than the regular tail to screen) and I know I'm tailing the
current data coming in.
This is not a good way to do this as that "wait xxx seconds" is not guaranteed
to empty and I don't know how to even calculate the xxx, or how to program
"wait until I seed the data streaming"
I'm also concerned about where all this data is being stored, I mean what if I
don't get to tail -f for days? is this going to grow forever?
any ideas?
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