A89: Re: Serial Communication in ASM
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A89: Re: Serial Communication in ASM
I'm not exactly the one to answer all of your questions, but I think that
the PC program only echos VT100 or other specific data over the serial port.
For this you would have to know about the VT100 standard and how it sends
and receives data. I have no idea where to find this information other than
that it is probably on the net somewhere.
I think what your code does is just send binary data through the link port,
and since it is not VT100 standard, the PC doesn't display it. If the PC
program did display anything, it would be in binary and look something like:
0010100011101100101110011010001011100001101100101101011011010101011010101010
10101010101010100101
since it is twelve characters long. (8bits per char)
I don't think baud rate has anything to do with this since this is a
hardware thing and the GL has a constant baud of 9600, and the PC adapts to
that. Has anyone gotten the GL to do anything lower? I've tried to connect
my GL to a very very old modem and it wouldn't work.
No handshaking is necessary in your example, since all the PC is doing is
echoing (displaying) what is sent over the serial port you specified.
Of course, I may be wrong about all of this and it might be something as
simple as you accidentally set the program to listen to the wrong COM port
=)
-Miles Raymond EML: m_rayman@bigfoot.com
ICQ: 13217756 IRC: Killer2 AIM: MRayMan
http://www.bigfoot.com/~m_rayman/
-----Original Message-----
From: ipscone@halcyon.com <ipscone@halcyon.com>
To: assembly-89@lists.ticalc.org <assembly-89@lists.ticalc.org>
Date: Thursday, January 28, 1999 11:55 AM
Subject: A89: Serial Communication in ASM
>What is required to send data over the serial port, using ASM?
>
>There are several serial I/O commands but I'm not sure what
>is required.
>
>How would one modify the Hello World program to, in addition
>to sending 'Hello World' to the screen, it would also send
>it out over the serial port.
>
>I have a program that echos to the PC screen anything received
>by the COM port,
>
>I added the following to the Hello World program, just between
>correcting the stack and the idle statements, but nothing was
>displayed on my PC screen. So, obviously there is something
>that I am missing.
>
> move.w #12,-(a7) ; 12 words to xmit
> pea hello(pc) ; pushes address of string to stack
> jsr doorsos::transmit ; transmits data
> lea 6(a7),a7 ; corrects stack
> jsr doorsos::flush_link
>
>What else is required? What is baud rate? Is there any
>special handshake required, on the PC end? What? Is there any
>source code example, for this handshake, if requried? Where?
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