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philm
Joined: 14 Jul 2004
Posts: 138
Location: Australia
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 Posted: Sun Sep 19, 2004 2:10 am Post subject: Hyperterminal Hangs? |
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When I use ANSI/VT100 terminal control escape sequences, after a time, Hyperterminal hangs my computer. It works fine for a little while, but then hangs.
| Code: | '***************************************************************
'ANSI Clear Screen
'***************************************************************
Ansicls:
Printbin 27 ; 91; 'escape [
Print "2J"; 'erase screen
Return
'***************************************************************
'ANSI Locate
'***************************************************************
Sub Ansilocate(byval Row As Byte , Byval Col As Byte)
Printbin 27 ; 91; 'escape [
Print Row ; ";" ; Col ; "H"; 'force cursor position
End Sub
'***************************************************************
'ANSI Clear current line
'***************************************************************
Ansiclrline:
Printbin 27 ; 91; 'escape [
Print "2K"; 'erase the current line
Return |
Is there a better (free) ANSI/VT100 terminal emulation prog?
Thanks
Phil |
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albertsm
Joined: 09 Apr 2004
Posts: 5319
Location: Holland
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| Posted: Sun Sep 19, 2004 2:13 am Post subject: |
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When the BASCOM terminal emulator does work, i can create a stand alone terminal emulator when you can not find another one.
_________________
Mark |
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Frankeman
Joined: 11 Aug 2004
Posts: 945
Location: the Netherlands
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| Posted: Sun Sep 19, 2004 9:16 am Post subject: |
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Hi,
Do you know when HyperTerminal hangs or is it random ?
Is it possible that you send invalid esc codes ?
Frank. |
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philm
Joined: 14 Jul 2004
Posts: 138
Location: Australia
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| Posted: Mon Sep 20, 2004 12:00 am Post subject: |
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Mark,
The inbuilt terminal emulator does not hang, but it after a while it shows a blank screen. All I can see is the cursor moving around to the correct positions, but no characters.
Frank,
I am using serial at 38400 and stream constant data.
I suspect that hyperterminal hangs when it's input buffer overflows. I have a slow (330MHz) computer, and do not use any handshaking.
So I would guess that other programs will do the same or similar.
Maybe Mark can include xon/xoff flow control into all the print statements (only joking).
Maybe it is a good excuse to get a new computer.
Phil |
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Frankeman
Joined: 11 Aug 2004
Posts: 945
Location: the Netherlands
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| Posted: Mon Sep 20, 2004 10:21 pm Post subject: |
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Hi Phil,
I wrote a little test program
| Code: |
$regfile = "8052.dat"
$baud = 57600
$crystal = 11059200
dim a as long
do
print a
incr a
loop
end
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With this received on a P4 3Ghz terminal emulatie never craches.
A super high baudrate is in some case not effective.
For example if you have a processor running at 1 Mhz and a baudrate of 256000 the processor can simply not make the data to send in one contant stream.
In my test prog with a baudrate of 19200 the counter is at 4000 after one minute.
When i increase the baudrare to 57600 (3 times faster) the counter is at 4300 after one minute.
Thus not 12000 what you might have been expected.
A baudrate of 19200 is mostly the highest speed to send data.
Frank. |
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philm
Joined: 14 Jul 2004
Posts: 138
Location: Australia
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| Posted: Tue Sep 21, 2004 12:33 am Post subject: |
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Yes the program as a whole will not run 3 times faster, but the "print a" statement will run 3 times faster.
what happens if you run this.
| Code: |
$regfile = "8052.dat"
$baud = 57600
$crystal = 11059200
declare sub Ansilocate(byval Row As Byte , Byval Col As Byte)
dim a as byte
gosub Ansicls
do
Ansilocate(10, 10) 'locate somewhere
print a;
incr a
if a = 0 then gosub Ansicls 'clear screen every 256 iterations
loop
end
Ansicls:
Printbin 27 ; 91; 'escape [
Print "2J"; 'erase screen
Return
Sub Ansilocate(byval Row As Byte , Byval Col As Byte)
Printbin 27 ; 91; 'escape [
Print Row ; ";" ; Col ; "H"; 'force cursor position
End Sub |
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Frankeman
Joined: 11 Aug 2004
Posts: 945
Location: the Netherlands
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| Posted: Tue Sep 21, 2004 6:31 pm Post subject: |
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| Quote: | what happens if you run this.
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I get compiler errors  ,Your example is Bascom AVR code i use Bascom 8051.
The program works fine, hyperterminal don't hangs. |
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