Hi Harold,
I'm looking at the spin program. I have never written anything in spin before,
but it really just looks like C.
If you open the project and click "VT100_Emulator-2.spin" on the left side...
you will see the emulator code.
The biggest routine there is:
'' Process next byte from our host port
PUB singleSerial0(c)
Which you can see is where the brains are for decoding the escape sequences.
It's a state machine, in State 0, it's just displaying characters and handling
the simple control characters.
When an escape sequence starts (ie character 27) the line:
if c ==27
state :=1
return
then kicks the state machine to state 1.
I'm not too familiar with C, but I can see that the following operators
probably do this....
:= (colon-equal) assign the number
== (equal-equal) compare the expressions
+= (plus-equal) add the value of the right expression to the variable on the
left.
|= (bar-equal) logically OR's the value of the right expression to the
variable on the left.
So, in BASIC you would write:
a = a + 5
Here you would just write:
a += 5
BASIC: a = 99
SPIN: a := 99
on CR (13) I see the line:
pos := pos - (pos // text#cols)
I guess they could have wrote:
pos -= pos // text#cols
Either way, I conclude that the expression pos//text#cols
would give the remainder of pos (current position) divided by the number of
columns.
So this would effectively put the current position to the start of the line.
The reference "text#cols" probably works through a link at the top of the
source in the OBJ section.
It says:
text: "VGA_1024"
and if you look at the VGA_1024.spin file, you'll see what I believe is a
definition for the cols.
since it's in a section called "CON" I will guess that means "Constant", so
cols is a constant set for 80.
Anyway, look back at that state machine.... in state 1, it will process any
escape sequence.
If the sequence then has a square bracket, it advances to state 2 where it will
fetch the first parameter, then to state 3 to fetch the 2nd parameter and
finally state 4 to process that command. I see in State 4, that it calls
another routine called ansi. Check that subroutine out! It looks like it
covers all the escape sequences I'm familiar with.
Make backups of your files, and try something new!
Good luck
Josh
Date: Sat, 14 Mar 2015 18:54:44 -0700
From: [email protected]
To: [email protected]
Subject: [N8VEM-S100:6541] Re: Propeller console IO board
My EPROM programmer is not working so when I needed to get the FW for the
console IO I paid Josh for the new version 2.3. However he also included
another EPROM with version 2.4. The only difference between the two is that in
version 2.4 you can also have a terminal running through the serial IO of the
CPU board. Anyway, I don't know if Josh has actually finalized version 2.4. If
he is following this thread he may comment.
As far as the ESC codes go I just used BASIC to construct the VT100 terminal
codes that I found online. Unfortunately the VT100 emulation that I downloaded
and compiled with the consoleIO.spin does not have all of the codes. They could
be added if I understood the program well enough.
On Friday, March 13, 2015 at 11:07:38 AM UTC-4, [email protected] wrote:Hi all,
Just finished the propeller console IO board and I have it running with the
8080A CPU board with Josh's rev 2.4 ROM. I downloaded the firmware to run the
screen and keyboard as a VT100 terminal. That works pretty well but some of the
ESC codes for screen control don't work. Has anyone done any more programming
through Parallax on the .spin programs?
Just curious.
Thanks,Harold
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