buffer size of serial port

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Wills - 20 Sep 2007 11:20 GMT

Hi all,
When using javax.comm for serial communications what is the
buffer size where the data read from the UART is stored .The Serial
Communication APIs tell that we can use an InputStream object over the
Serial port to read data from it.The buffer size of the UART itself is
two, but how to find the size of the Java Buffer where data from UART
is kept before reading using read().

Thanks in advance.

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Knute Johnson - 20 Sep 2007 17:49 GMT

> Hi all,
> When using javax.comm for serial communications what is the
[quoted text clipped - 5 lines]
>
> Thanks in advance.

Why do you care. Just read the data. If you need to buffer it some
more, use a BufferedInputStream. If you really have to know you can
call CommPort.getInputBufferSize(). Don't you have the docs?

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Knute Johnson
email s/nospam/knute/

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Wills - 26 Sep 2007 07:21 GMT

> Why do you care. Just read the data. If you need to buffer it some
> more, use a BufferedInputStream. If you really have to know you can
[quoted text clipped - 4 lines]
> Knute Johnson
> email s/nospam/knute/

Thanks.
The documentation says that the ".available()" method does not
guarantee exact number of data(bytes) available in the Buffered output
stream.

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Knute Johnson - 26 Sep 2007 17:23 GMT

>> Why do you care. Just read the data. If you need to buffer it some
>> more, use a BufferedInputStream. If you really have to know you can
[quoted text clipped - 9 lines]
> guarantee exact number of data(bytes) available in the Buffered output
> stream.

It should come with a big warning not to use it too! You might want to
post some of your code here so we can see what you are up to.

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Knute Johnson
email s/nospam/knute/

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buffer size of serial port

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