Article View: comp.sys.amiga.tech
Article #11677Re: DTR and serial.device
From: J. Dow
Date: Sat, 04 Mar 1989 08:50
Date: Sat, 04 Mar 1989 08:50
47 lines
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2458 bytes
In article <15068@oberon.USC.EDU> papa@pollux.usc.edu (Marco Papa) writes:
>In article <443@madnix.UUCP> perry@madnix.UUCP (Perry Kivolowitz) writes:
>|Marco's suggestion to access the CIA registers directly for toggling
>|DTR is *not* a good idea for the following reason: No other serial
>|port besides the internal one uses the CIA.
>...
>|Another suggestion:
>|In an earlier incantation of my serial device driver I added a command
>|which would allow access to all setable outputs. Something like:
>|
>|io_Command = CMD_SET_SERIAL_CTRL_LINES;
>|io_Length = MASK_OF_BITS_TO_BE_AFFECTED;
>|io_Actual = WHAT_TO_SET_THEM_TO;
>|
>|DoIO(IOB)
>|
>|If we all agree to make this a standard, well then, it will become a
>|standard.
>
>Perry,
>
>I just received word from Bryce that the "standard" way to drop DTR
>is to close and then reopen the device. This should work no matter
>what serial device and unit one is using.
>
>-- Marco Papa 'Doc'
This is a badly broken approach. There MUST be a method of dropping DTR in
a multitasking environment without losing the serial device. If you close the
device something else can sneak in there and steal it. I hope Bryce rethinks
this serial attitude problem and cleans this freking thing up a bit. All the
bits of the port should be controllable by the application software through
standard means. Otherwise some uses becoem too awkward to bear thinking about.
{`_'} Grump
--
Sometimes a bird in the hand leaves a sticky deposit.
Perhaps it were best it remain there in the bush with the other one.
{@_@}
jdow@bix (where else?) Sometimes the dragon wins. Sometimes
jdow@gryphon.CTS.COM the knight. Does the fair maiden ever
{backbone}!gryphon!jdow win? Surely both the knight and dragon
stink. Maybe the maiden should suicide?
Better yet - she should get an Amiga and
quit playing with dragons and knights.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!ukma!xanth!ames!elroy!gryphon!jdow From: jdow@gryphon.COM (J. Dow) Newsgroups: comp.sys.amiga.tech Subject: Re: DTR and serial.device Summary: Eeeewwww Keywords: serial, RS232, modem Message-ID: <12897@gryphon.COM> Date: 4 Mar 89 08:50:34 GMT References: <10511@well.UUCP> <15000@oberon.USC.EDU> <443@madnix.UUCP> <15068@oberon.USC.EDU> Reply-To: jdow@gryphon.COM (J. Dow) Distribution: usa Organization: Wizardess Designs, Hermosa Beach, Ca. Lines: 47