Alan Cox wrote:
As the flow control is driven by software on most 16x50 chips (there are
a couple of exceptions) if we fail to empty the fifo fast enough then any
flow control will be asserted too late to save the day.
If you stop the application and do the following
cat /dev/ttywhatever
^Z
[stopped]
(so you are asking the OS to buffer data but not ever reading it)
and then fire data at it does the flow control eventually occur ?
Yes it does appear to. I told the application to simply sleep(300) at
the appropriate moment, and I watched the application and when it began
the sleep I ran:
cat /dev/ttyS1
(lots of "garbage" began spewing forth)
^Z
(about 2 or 3 seconds and the RTS light goes dark)
Thanks,
Lee.
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