BBC BASIC for Windows - Serial port buffer

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Serial port buffer

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manxman
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Re: Serial port buffer
« Reply #4 on: Dec 12^th, 2012, 8:31pm »

Hmmm.

My program will only ever be running on a specific machine which is acting mainly as a data logger. I had never considered the use of a timer interrupt (and have no experience of such). From the link you give I could presumably increase the buffer size by including the statement:

_In_ A% dwInQueue

in my code, where A% is the desired size of the input buffer.

Regards,

Manxman

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admin
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Re: Serial port buffer
« Reply #5 on: Dec 12^th, 2012, 9:34pm »

on Dec 12^th, 2012, 8:31pm, manxman wrote:

From the link you give I could presumably increase the buffer size

Yes, the SetupComm API function is the way to try to increase it. The MSDN description doesn't make clear whether a 'success' return from the function (i.e. a non-zero value) means that the requested buffer size was accepted, but if in doubt you can always call the GetCommProperties API which returns the current buffer size in the dwCurrentRxQueue member. If I try to double the buffer size from the default 4096 bytes to 8192 bytes, here it succeeds:

Code:

      SYS "SetupComm", @hfile%(channel%), 8192, 0

Richard.

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manxman
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Re: Serial port buffer
« Reply #6 on: Dec 13^th, 2012, 4:43pm »

Wunderbar.

I will include that call in my program and hopefully that will provide my solution.

Thanks again for your professional support.

Manxman

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