UVENT Problems

[Rainer Dybowski]

Hello from Germany
It would be very nice if someone could help me.
Excude me for this terribel english. I will do my very best.

I found a code snippet on the net where the guy
called "Mark Junker" programms a multitasking add
on for Power Basic DOS. I found it very interesting
and tried to modify it. So, pricipil it works fine
but the problem is that you must start the programm
more then one time.

First time the User Event never happens.
When you stop the programm and restart it again then
it works. After that you can stop and start how much
you like. It never fails.
After new rebooting (cold or warm) the problem is back.

Too fix this problem i have removed all "Mutitasking"
Programm Lines and all unnessary parts.

Now there are a few lines left . Only the Uvent Hook
is nearly the same. And it looks now much like many
Uvent Code, Tips and Tricks i found here on your great BBS.

Now i will explain what the programm shood do.

I must hook on the RealTimeClock Period Interupt.

By the way. When i change this Hook to Timer Int &H1C
it works...............
But Sorry, i need this special RTC Interupt &H70

Because this Hardware Interupt is controlled via PIC2
(Interupt Controller 2) i think i had send zwo EOI
Command. First to the Slave then to the Master PIC.

But that is the problem. I don't know where and how.
I have tried many. I cannot find special information
in the Power Basic Doku or the net. Most examples only
explain how to hook on software interupts (which works)
not on hardware interupts. (And when hardware int's then
only via PIC1 Interuptcontroller 1)

Does anyone has an idea whats going wrong or how Power Basic
handles EOI's in IRS Service Routines.

I attach the code which i have compiled with PB 3.2 and 3.5.
Tested on W98 (DosBox), DOS6.2, Caldera DOS,W95 Command Line
Always the same result.

I think that somethings going wrong with the PIC Controller.
Perharps the Interupt is Requested but when no EOI Commando
returns because i shortly disabled INT8 while installing the
hook the SetUvent Procedur is never called.

Can Anyone please help
Best Regards

Rainer

###############################################################

$LIB ALL OFF                   ' Alles übrflüssige weg
$LIB COM ON                    ' Com Unterstützung linken
$STRING 32

declare sub SetUEvent ()       ' SetUEvent' verfuegbar machen

%INT_HOOK   = &H70     'Real Time Clock

%IMR1=33    ' $H21 IMR (Interupt Mask Register von Controller 1)
%IMR2=161   ' $HA1 IMR (Interupt Mask Register von Controller 2)

DIM IRQ8HandlerPTR AS SHARED DWORD PTR

DIM OldStatRegB    AS SHARED BYTE         ' CMOS Register merken
DIM OldPic2Value   AS SHARED BYTE         ' Interupt Controller 2

'***************************************************************************

on uevent gosub TaskHandler    ' Basic-Part des INT-Handlers aktivieren
on error goto TaskerStop       ' Bei Fehlern Programm SOFORT beenden
exit far at TaskerStop         ' Bei kritischen Fehlern bei TASK.CREATE
                               ' wird EXIT FAR ausgefuehrt (SOFORT ENDE)

Set_CMOS_Register              ' Handler installierund und RTC
                               ' aktivieren
UEVENT ON

$EVENT ON

  cls

   do
      call Test1
   loop until inkey$ = chr$(27)     'ESC

$EVENT OFF

TaskerStop:
Reset_CMOS_Register             'Handler deinstallieren und RTC auf Default
end

'***************************************************************************

$event off

IRQ8Handler:

 !       PUSH    AX
 !       PUSH    BX
 !       PUSH    CX
 !       PUSH    DX
 !       PUSH    SI
 !       PUSH    DI
 !       PUSH    BP
 !       PUSH    DS
 !       PUSH    ES
 !       CALL    far ptr SetUEvent

' !       MOV DX,&HA0      ' For Test Purposes
' !       MOV AX,&H20
' !       OUT DX,AX        ' EOI Slave
' !       MOV DX,AX        ' Adress is &h20 too
' !       OUT DX,AX        ' EOI Master

 !       POP     ES
 !       POP     DS
 !       POP     BP
 !       POP     DI
 !       POP     SI
 !       POP     DX
 !       POP     CX
 !       POP     BX
 !       POP     AX

 !       jmp dword ptr OldIRQ8Handler    ; Alten IRQ8-Handler aufrufen

OldIRQ8Handler:

 ! dd 0                             ; New Pointer
 ! dd 0                             ; Patched here
 ! dd 255
 ! dd 255

$event on

'***************************************************************************

$event off

TaskHandler:

 locate 12,1
 incr ticker???
 print ticker???

 return

$event on

'***************************************************************************

sub Test1                'Dummy SUB

 static x???

$event off

  locate 10,1
  print "This counter runs ";;x???;

$event on

  incr x???

end sub

'***************************************************************************

SUB Set_CMOS_Register

$event off

 ! cli

 out &H70,11
 OldStatRegB = inp(&H71)                ' Alten C-MOS-Wert (f. INTs) merken

 out &H70,11
 out &H71,OldStatRegB and 7             ' Alle RTC-Ints abschalten

 DISABLEHARDINT 8

 IRQ8HandlerPtr  = codeptr32(OldIRQ8Handler)  ' Adresse f. alten Handler
 @IRQ8HandlerPTR = GetInteruptVektor(%INT_HOOK)

 SetInteruptVektor %INT_HOOK, codeptr32(IRQ8Handler)

 out &H70,10
 OldStageDiv?=inp(&H71) and &HF0
 out &H70,10
 out &H71,OldStageDiv? or &B1010   ' Interrupt-Speed=15,258*2^Wert Mikrosek.
                                   '  Je langsamer, desto sicherer ...
                                   '  ... unter WIN u. a. Multitaskern
                                   ' &B1010
 out &H70,11
 out &H71,OldStatRegB or 64        ' periodischen RTC-Interrupt anschalten


 ENABLEHARDINT 8

 ! sti

END SUB

'***************************************************************************

SUB Reset_CMOS_Register

$event off                ' UEvent verbieten

 ! cli                    ; Interrupts verbieten

 out &Ha1,OldPIC2Value    : ' Alte IRQ-Maske fuer PIC 2
 out &H70,11              : ' Interrupts so an- od. ausstellen, wie vorher
 out &H71,OldStatRegB

 out &H70,10
 OldStageDiv?=inp(&H71) and &HF0
 out &H70,10
 out &H71,OldStageDiv? or &B0110 : ' Standard RTC-Interrupt-Speed

 DISABLEHARDINT 8
 SetInteruptVektor %INT_HOOK,@IRQ8HandlerPTR
 ENABLEHARDINT 8

 ! sti                                ; Interrupts wieder zulassen

 if err>0 then
  print "ERROR: ",pbvErr,eradr        : ' Wenn Abbruch durch Fehler, dann ...
 end if

END SUB

'***************************************************************************

Sub SetInteruptVektor (Byval Interupt As Integer,Zeiger As Dword)

 DIM Segment AS Local Word
 DIM Offset AS Local Word

 Segment = PointSeg (Zeiger)
 Offset=   PointOff (Zeiger)
 ! Push DS
 ! Push DX
 ! MOV AH,&H25
 ! MOV AL,Interupt
 ! MOV DS,Segment
 ! Mov DX,Offset
 ! INT &H21
 ! Pop DX
 ! Pop DS

End Sub

'***************************************************************************

Function GetInteruptVektor (BYVAL NU AS INTEGER) AS DWORD

  DIM TEMP AS LOCAL DWORD
  ! MOV AH,&H35
  ! MOV AL,NU
  ! INT &H21
  ! MOV TEMP[2],ES
  ! MOV TEMP[0],BX
  GetInteruptVektor=Temp

End Function

'***************************************************************************

Function PointSeg (Adresse AS DWORD) AS WORD

 PointSeg=Adresse \ 65536

End Function

'****************************************************************************

Function Pointoff (Adresse AS DWORD) AS WORD

 PointOff=Adresse MOD 65536

End Function

'****************************************************************************

Sub EnableHardInt (IntNr%)

 DIM IrqMaske AS Byte

 Nr%=IntNr%

 IF Nr% >7 Then
    DECR Nr%,8
    MaskPort%=%IMR2
 ELSE
    MaskPort%=%IMR1
 END IF

 irqMaske=255
 BIT RESET irqMaske,NR%
 irqMaske=INP(MaskPort%) AND irqMASKE

 ! CLI
   OUT MaskPort%,irqMASKE
 ! STI

END Sub

'***************************************************************************

Sub DisableHardInt (IntNr%)

 Nr%=IntNr%

 IF Nr% >7 Then
    DECR Nr%,8
    MaskPort%=%IMR2
 ELSE
    MaskPort%=%IMR1
 END IF

 irqMaske%=0
 BIT SET irqMaske%,NR%

 ! CLI
  OUT MaskPort%,INP(MaskPort%) OR irqMASKE%
 ! STI

End Sub

'***************************************************************************




------------------

[Lance Edmonds]

there was a recent thread on isr coding that may be of interest to you...
http://www.powerbasic.com/support/pb...read.php?t=401

beyond this, i'm not sure what else to suggest... maybe someone else has some ideas or experience with this?

------------------
lance
powerbasic support
mailto:[email protected][email protected]</a>

[Rainer Dybowski]

Hello and Happy New Year All Togehter.

for Lance:
I had read this thread before but he did not help me with my
problem. I have read ALL related threads before i asked.

by the way. I have send you an additional email to
[email protected] where i have asked for updated handbooks.
I have version 3.5 but old 3.0 handbooks.
You said nothing about that question !!!!

for All:
I hope that someone will try to compile and
run my sourcecode so he will see the problem.
If there are difficults with "text formatting"
i will send the source code via email.
Please contact me then if that's the problem

The easyiest way to see what i mean is to run the proggie
within the IDE in a W98/95 Dos Box for one time.
Then you see a test counter which runs.
When you then stop the proggie and start it again the
second counter from the Uvent Routine runs too.
At that point you can run the proggie always fine until
you close the W98 Dos box (virtual machine)

In a new DOS Box its again the same. So you can test and
try without rebooting the pc.

If you change the constant %INT_HOOK from &h70 to &H08
you will see that with this other interupt it works
without the reported problem.

But i need the RTC interupt because of changing the
interupt frequency on the fly. Also this interupt
(alarm, periodly) is usually not used, in other words FREE.

If someone needs additional explainings about the
settings for the realtimeclock i made, please ask.

Shortly
in the Sub Set_Cmos_Register following should happen

1. Masking Interupt - Disable
2. store old rtc register
3. store old pic2 register
4. manipulating rtc registers for interupt frequency
6. install new handler
5. activating periodly RTC interupt
7. Masking Interupt - Enable

after that sub i switched UEVENT ON.

It seems to be that for any unknown reason PowerBasic
not get a SetUvent Trigger at the first time. But why
it's ok when you run the proggie twice ??????????????

best regards
Rainer



------------------

[Tom Hanlin]

' ! MOV DX,&HA0 ' For Test Purposes
' ! MOV AX,&H20
' ! OUT DX,AX ' EOI Slave
' ! MOV DX,AX ' Adress is &h20 too
' ! OUT DX,AX ' EOI Master

It's been more than a few years but, if I recall correctly, you
want 8-bit OUTs here. Try replacing the OUT DX,AX instructions
with OUT DX,AL instructions.

------------------
Tom Hanlin
PowerBASIC Staff

[Rainer Dybowski]

Thanx Tom
for your reply.

But i had tested AX and AL before.
I could not right here all i have tested until now
because my mails would then bee too long and i think
no one will read it then ))

The only stupid but running workaround i found for 2 hours
is the following code snippet.

 **********************************************************
on uevent gosub TaskHandler 
on error goto TaskerStop  
exit far at TaskerStop                                

Set_CMOS_Register     ' ON
Reset_CMOS_Register   ' OFF            Two Line Work     
Set_CMOS_Register     ' ON AGAIN       Around

UEVENT ON             ' And now it works !!!!!!
                      ' But i don't know why !!!!
$EVENT ON
  cls
   do
      call Test1
   loop until inkey$ = chr$(27)     'ESC
$EVENT OFF

TaskerStop:
Reset_CMOS_Register  
end

**********************************************************

best regards
Rainer



------------------