Async serial communication error by changing bps...

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In my VC++ code,

I have successful running on the 112300 bps of serial communications

But I try to SetCommState(Comm, &m_dcb) with baudrate 230400 bps, it fails with GetLastError() code = 87// ERROR_INVALID_PARAMETER
Is this cased from hardware?
Please let me know the causes and solution.

Thank you in advance.

What I have tried:

More one day wasted for this problem.

Posted 26-Oct-17 15:01pm

Member 12330615

Updated 26-Oct-17 21:05pm

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Solution 2

Quote:
Is this cased from hardware?

It might be. As Dave already noted, 230400 (as well 112300) is not a standard speed. The hardware couldn't possibly warrant the requested timing accuracy at such a speeed.

Posted 26-Oct-17 21:05pm

CPallini

v2

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Dave Kreskowiak · Accepted Answer · 2017-10-26T17:28:00

87 (decimal) is Invalid Parameter, so, what does the rest of the code look like that sets up the port? You could be setting other parameters that doesn't work together.

From just what you posted, does the hardware support that rate? 230400 isn't one of the standard rates I know of. The closest standard rate is 256000.