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thrust8

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Delphi, error message

hi all,

I encountered a problem While runing my program.  Namely program shows error message:'invalid driver handle failed' then hangs up.

In a brief. Program is supposed to send every 15 ms an impulse via digital output of advantech card (card im trying to communicate with). Impulse range is 1 to 2 ms. Basis of servo control.
Problem has something to do with Timer. when event is assigned to Timer -  problem occurs.
I cannot attach program files, guess i can send that only individually.


Thank you.
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Geert G
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what is the code for creating the timer ?
and attaching the event
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thrust8

ASKER

This is where you can download Main program (servo_new): http://www.megafileupload.com/en/file/69418/servo-new-zip.html
(wait 24 seconds to download)


And here is DO_SOFT program of howto communicate with advantech:
http://myfreefilehosting.com/f/8005f9598f_0.1MB

i don't have any time to look for a needle in a haystack ...

just paste the code where you are getting the error.
run in Delphi and check "Stop on Delphi exceptions"
Avatar of thrust8

ASKER

Truth be told, i dont know where im getting the error. Everythig compiles ok, right after running it shows the error.

this is Timer code:

procedure TForm1.Timer1Timer(Sender: TObject);
begin
if not update_running then updateservo;

end;

and this is updateservo procedure:

procedure TForm1.updateservo; {every 18 - 20 msec : see timer}
{var  myjoy: tjoyinfo; }
begin
if disableservocheck.checked then exit;
update_running := true;
{if stickbox1.checked then
begin

outvalue(1); {on}
delay(trackbar1.position*10);
outvalue(0);   {off}

outvalue(2); {on}
delay(trackbar2.position*10);
outvalue(0);   {off}

outvalue(4); {on}
delay(trackbar3.position*10);
outvalue(0);   {off}

outvalue(8); {on}
delay(trackbar4.position*10);
outvalue(0);   {off}

update_running := false;
end;

update_running is set as global variable
update_running: boolean;

how can i check 'stop on delphi exceptions'?
menu Tools / Debugger options / Tab Language Exceptions

change the following :
this will make sure that when you do get an error in the routine,
update_running flag will be set correct

procedure TForm1.updateservo; {every 18 - 20 msec : see timer}
{var  myjoy: tjoyinfo; }
begin
  if disableservocheck.checked then exit;
  if not update_running then 
  begin
    update_running := true;
    try
      {if stickbox1.checked then
      begin
      ...
    finally
      update_running := false;
    end;
  end;
end;

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Avatar of thrust8

ASKER

This is how i changed it:

procedure TForm1.updateservo; {every 18 - 20 msec : see timer}
{var  myjoy: tjoyinfo; }
begin
if disableservocheck.checked then exit;
if not update_running then
begin
update_running := true;
try

........

finally
update_running := false;
end;
end;
end;

and still nothing.
'Stop on delphi exceptions' was checked all the time.
what do you mean with hang.
Can you pause the process in delphi after hangup ?

Avatar of thrust8

ASKER

Right after doubleclick on .exe file, the program shows that error message, and is idle, I cannot do anything with it, and need to close application outside Delphi.
I can pause it in delphi.
what does the stack show ?
use Ctrl-F3

it maybe in a initialization section of one of the units
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ASKER

Shows  'process is not accessible'
lol, pause it first, then call stack
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MerijnB
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Avatar of thrust8

ASKER

my bad..

_RDTSC((2044583639, 10140))
_ReadTSC(???)
ReadTSC(???)
ReadCycles((4,3550977806e+13, 159, 4,3553012965e+13))
ReadSeconds((4,3550977806e+13, 159, 4,3553012965e+13))
delay(1470)
TForm1.updateservo
TForm1.Timer1Timer(???)
Servo
does anything work if you change the routine delay to
use sleep(xxx) ?
what i don't understand is, it looks like you want an accurate timer control
but you use 5 calls to accomplish this ?
you lose accuracy with each call ...

Avatar of thrust8

ASKER

sleep(xxx) changes nothing, tried that also.
5 calls, one for each servo. But I hope there is a better way to solve this. To update one servo at a time.

That program was originally designed to work with lpt. All i did was renewing HRTimer to todays standards and replaced outvalue procedure with the one i needed to communicate with advantech.
um, i think debugging on your machine would be the solution
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