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921600 baud rate

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javad

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Jul 14, 2010, 11:40:46 AM7/14/10
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Hi
i need to use MATLAB for driving a serial port with 921600 baud rate
but it does not work with this speed
what can i do ?
it is really important for me to have this baud rate in MATLAB

Walter Roberson

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Jul 14, 2010, 12:02:54 PM7/14/10
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Amazing, I didn't think typical serial ports would run that fast, but I
do see that listed as the top-end speed for some ports.

My _expectation_ would be that Matlab cannot keep up with the interrupt
rate needed for such a port in typical (16-byte FIFO) operation, but
that it might be possible if your serial port had a much larger buffer
and especially if it could DMA into or out of your buffer space.

Are you needing to input or output at that rate? And what kind of
application requires you to go that fast without switching to RS422 or
to a 4-wire T1 or E0 transmission ?

javad

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Jul 15, 2010, 3:40:11 AM7/15/10
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Walter Roberson <robe...@hushmail.com> wrote in message <Pcl%n.31798$Ls1....@newsfe11.iad>...

Hi
Dear walter
first, thanks alot for your reply
exactly i use usb bluetooth transceiver that work as a standard COM port.
i think the buffer size is not important(at least at first step),
because now just i tested it by sending and receiving one byte,
in this case, hypertrm of windows is working perfect but MATLAB no.

javad

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Jul 16, 2010, 11:05:21 AM7/16/10
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Hi
Dear all
finally i found the solution
i used newer matlab version(2009), and it work perfect !!!
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