Virtual terminal

ferrousduke · Joined: 31 Mar 2008 Posts: 29 Location: Mumbai, India

Hello,
I have this problem regarding virtual terminal of ISIS Proteus. using latest CCS C compiler but characters are not being displayed normally as in the picture.. printf function seems to be working but everything is ЁЁЁЁЁЁЁ ... what is it that I am doing wrong?

amirharis · Joined: 27 May 2008 Posts: 7

hello..
may i know, what version of proteus that u use?

dyeatman · Joined: 06 Sep 2003 Posts: 1933 Location: Norman, OK

Your best bet is to look for Proteus support in the Proteus forum:
http://support.labcenter.co.uk/forums/

b77ng · Joined: 22 Jan 2014 Posts: 7

I know that this is a very old topic and I also know the official policy concerning Proteus, but since it was the first result of a "Proteus virtual terminal problem" (or something) search, thought I'd share my findings with other Googlers...
Looks like the VT thing in Proteus is usable but rather buggy. First, I'm sending data with even parity at 9600 baud, in a "null modem" configuration (only RX pin on the terminal is connected) and it only works when the terminal is configured for no parity. Otherwise I get garbage. I have checked the waveform and it does have the parity bit.
Second, using no inter character delays eventually ends in corrupted data but not always. I haven't been able to isolate the exact scenario that causes the problem, but looks like a 1ms delay fixes it. Testing the same scenario with no delays on a physical serial port works ok (!!).
All in all, the VT device is usable and I was able to find some bugs by using it, too bad it has such trivial and likely easily fixed issues.

temtronic · Posted: Thu Mar 27, 2014 7:35 am

I don't consider any software 'usable' when you say it's 'buggy' and has data problems (corrupted, but not always). Since it fails in the simplest of all tests, 'loopback', I'm not impressed.
Then again you are talking about Proteus which is well known to NOT be 'usable' when dealing with PICs.

Also the configuration of 8 data bits, even parity is not common. Probably 99.999% of all UART communications is no parity due to the UART architecture being based on 8 data bits these days.

jay

b77ng · Joined: 22 Jan 2014 Posts: 7

Well, in case someone is dead set on using Proteus, for whatever reason, and decides to Google the problem...
Worst thing that can happen is a few kilobytes wasted on the server's hard drives.