I hope I won't run into any further issues with timing, serial comms, windows dark magic, etc.

Of course there are further issues.

Win32::SerialPort uses Win32::CommPort which uses Win32::API to export some functions from the Windows API. And it seems that Win32::API doesn't like to work together with Inline::C - at least serial communication doesn't work with the solution derived in the posts above. I get a deluge of error messages, like
Use of uninitialized value in subroutine entry at C:/Perl/site/lib/Win
+32API/CommPort.pm line 213.
Use of uninitialized value in subroutine entry at C:/Perl/site/lib/Win
+32API/CommPort.pm line 247.
Second Read attempted before First is done at measure.pl line 402
Use of uninitialized value $got in numeric ne (!=) at C:/Perl/site/lib
+/Win32/SerialPort.pm line 1216.
Use of uninitialized value in subroutine entry at C:/Perl/site/lib/Win
+32API/CommPort.pm line 213.
Use of uninitialized value in subroutine entry at C:/Perl/site/lib/Win
+32API/CommPort.pm line 247.
Second Read attempted before First is done at measure.pl line 402
Use of uninitialized value $got in numeric ne (!=) at C:/Perl/site/lib
+/Win32/SerialPort.pm line 1216.

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In reply to Re^5: Calling a function form an external DLL with Inline::C on windows by Anonymous Monk
in thread Calling a function form an external DLL with Inline::C on windows by Anonymous Monk

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