Re: Slightly OT: Amiga serial port programming question

From: Daniel Kahlin (
Date: 2004-01-24 10:11:38

On Fri, 23 Jan 2004, Marko Mäkelä wrote:

> Hi all,
> Today, I spent some time debugging a development version of c2nload,
> the 38400 bps auto-starting fastloader for the C2N232 adapter.  The
> program displays a progress meter.  It has to be implemented differently
> for each major platform:
> - On POSIX termios, I set up alarm(2) and catch SIGALRM.  The write(2)
>   system call will be interrupted after the predetermined timeout, and
>   it will report the number of bytes sent until the interrupt.
> - On Win32, a write timeout is specified with the SetCommParams function.
> - On AmigaOS, I haven't figured out a solution.  When a CMD_READ
>   operation is aborted, the field io_Actual reports the number of bytes
>   read so far.  However, with CMD_WRITE, no matter if I do AbortIO and
>   WaitIO, or CheckIO, or nothing, the field remains zero.  Is there a
>   solution?  I tried Google, but didn't find any applicable code.

I don't really remember much of the Amiga specific detail, but in over5 
(0.711), I seem to ignore data read in blocks that got timeout.

I attached the file bl_serial.c which is the Amiga serial-drivers for 
over5, originally based on Olaf Barthel's 'Term' code.
The routing SerRead() does reading with timeout.  I don't use the size 
when getting a timeout, but perhaps it works if you add it.  There 
might be differences in our approaches that make it work, have a look.


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