On Wed, May 10, 2006 at 05:14:30PM +0100, Dave Korn wrote:
On 10 May 2006 14:05, Karel Kulhavy wrote:
Hello
It looks like tcdrain in cygwin doesn't wait until data are transmitted,
but just drains the software buffer, and doesn't drain the buffer in the
16550A chip. Can you please
Hello
It looks like tcdrain in cygwin doesn't wait until data are transmitted,
but just drains the software buffer, and doesn't drain the buffer in the
16550A chip. Can you please confirm that this is really how Cygwin
works?
I got data corrupted because of this because the data rate
On 10 May 2006 14:05, Karel Kulhavy wrote:
Hello
It looks like tcdrain in cygwin doesn't wait until data are transmitted,
but just drains the software buffer, and doesn't drain the buffer in the
16550A chip. Can you please confirm that this is really how Cygwin
works?
Nope, but I can
On Wed, May 10, 2006 at 03:04:41PM +0200, Karel Kulhavy wrote:
It looks like tcdrain in cygwin doesn't wait until data are transmitted,
but just drains the software buffer, and doesn't drain the buffer in the
16550A chip. Can you please confirm that this is really how Cygwin
works?
The source
the RTS signal... I plugged the oscilloscope to see
those two signals and this is what it happened:
(See attached file: Signals - tcdrain.PNG)
To me, seeing this I think that tcdrain is not doing what it is supposed to
do.
Then I used the ioperm, reading the LSR register to check when the output
know about this buffer.
tcdrain() will only report that the byte has left the OS buffer. It
won't know if the byte is still sitting in the device's buffer.
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in the line with the command Write and I wait for the last byte to
be written with tcdrain() and then I switch the RTS and RTS lines. But when
I see the signals in the oscilloscope I realized that the tcdrain call is
not waiting till the output buffer is empty and I switch the RTS and DTR
lines
byte to
be written with tcdrain() and then I switch the RTS and RTS lines. But when
I see the signals in the oscilloscope I realized that the tcdrain call is
not waiting till the output buffer is empty and I switch the RTS and DTR
lines before I write all the bytes !! I attach my code, is it something
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