TSR programms

[Gustavo Asplanatti]

Dear People:

I am trying to make a TSR (with POPUP INTERRUPT) that takes the interruption for hardware 5, the resident activate, read data of the serial port (from a GPS) and It returns me some data after some calculations.

That is to say:

1 - How do I make so that a hardware interrupt runs the program resident? (I don't use CALL INTERRUPT from another program because the sign comes from the GPS)

2 - Does some problem exist reading the port series? (OPEN, etc.)

3 - how do I make to be able to use the data obtained from another program? The system REG doesn't work from TSR to main programm. I don't find to use a file and then to read it.

Thank you

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Gustavo Asplanatti

[Tom Hanlin]

1. POPUP INTERRUPT should do that for you.

2. PowerBASIC supports reading the serial port. Do you have a reason to expect a problem?

3. The TSR or other program could hook an interrupt and accept custom interrupt functions to transfer data.


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Tom Hanlin
PowerBASIC Staff

[Gustavo Asplanatti]

Tom:

We want to do a hardware interrupt (IRQ 5) activate a popup programm (TSR), every time we reacieve the one second signal from a GPS receiver.
We made some test:

- We connect a push buttom between +5 volts and IRQ 5 (B23 ISA slot).
We wrote the following popup programm:

POPUP INTERRUPT 5,18,OFF,OFF
dummy& = SETMEM(600000)
POPUP SLEEP USING EMS,"C:\PBSWAP.$$$"
DO
   LOCATE 1,1 
   PRINT "Hello"
   POPUP SLEEP
LOOP UNTIL 0

When we push buttom nothing happens, we tried changing to POPUP INTERRUPT 13,18,OFF,OFF , with no result.


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Gustavo Asplanatti

[Tom Hanlin]

An IRQ interrupt is not the same as an INT interrupt. As it happens, INT 5 handles
"Print Screen" under DOS. It's been many years since I've worked with this sort of
thing, but our ancient copy of the excellent COMPUTE's Mapping the IBM PC and PCjr
suggests that IRQ 5 maps to INT 14 (decimal). Try that.


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Tom Hanlin
PowerBASIC Staff

[Gustavo Asplanatti]

Dear Tom:

I am really quite confused... I have proven their advice, but neither it worked.
In Peter Norton's old book "Programme Guides IBM PC", says that the Interruption 14 (decimal) it is the Sign of attention of the diskette.

In http://www.powerbasic.com/support/fo...3-000352.html, Lance Edmonds responds to Steve Bouffe the following thing: "you have to write an ISR (Interrupt Service Routine) and redirect the interrupt vector to your code"...

Are you able to take me out of this uncertainty?

Thank you, very much !!

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Gustavo Asplanatti

[Lance Edmonds]

My PC System Programming reference book suggests that IRQ 5 is mapped to INT 13 by default.

IRQ0 -> INT 8
IRQ1 -> INT 9
etc.

However, the hardware interrupt controller may need to have the interrupt mask set to permit interrupt requests from IRQ5, etc.

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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Gustavo Asplanatti]

Hi Lance !!

I am still confused... More than yesterday..
I am reading Power Basic manual and says textually: "POPUP INTERRUPT lets a program pop up when a software or hardware interrupts occurs".
Now, may need to have the interrupt mask, well, How am I able to make this?
Does it really work?

Please, give me you some example that can use.

Thank ....

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Gustavo Asplanatti

[Tom Hanlin]

What Lance is saying is, the problem here may be that you need to properly
initialize the interrupt controller to recognize IRQ 5. I don't remember
this as being particularly difficult, but it's been a good 15 years since
I've done this sort of twiddling. These days, I'm not sure where you could
even find a reference on the subject. You might be able to find some hints
in source code for something like a good serial communications driver, which
would need to do this sort of thing.

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

[Emil Menzel]

I'm not sure why you need Popups at all -- as opposed to simply
polling the serial port to see if any data is coming in. Pasted
below is an example of the latter procedure; it amounts to a
special purpose driver. Don't expect it to work as such with
your GPS. But hopefully it might give you some leads. By all means
ask the manufacturer of the GPS for information on writing a driver,
if they don't already provide it.

Good luck!

============================================================
'STICDRV.BAS
'by E.W. Menzel, Jr.
'September, 1999
'Purpose: Read serial-port data from Measurements Systems Inc.
'force-based joystick. Translate it into X,Y motion, & also
'save data on force.
'Language: PowerBASIC 3.5 

DEFINT A-Z

DECLARE SUB StickOpenPort(FileNum%)
DECLARE SUB StickParseData(RawData$, x%, y%)
DECLARE SUB StickUnParse(RawData$,x%,y%)

DECLARE FUNCTION ClockTic&()
DECLARE FUNCTION StickClearPort$(FileNum%) 'gets everything
DECLARE FUNCTION StickData$(FileNum%)      'gets one 3-byte pack
DECLARE FUNCTION StickParseCheckOK(x%,y%)  'checks translation of Mouse data
$COM 1024         'set size of COM buffer

$IF 0
'demo 1... unREM $IF0 & $ENDIF to run demo
ff=0   'let SUB StickOpenPort find FREEFILE file handle
CALL StickOpenPort(ff)
Start&=ClockTic&
DO UNTIL INSTAT
    RawData$=StickData$(ff)
    IF LEN(RawData$) THEN
        Sec=(ClockTic&-Start&)/18.20684  'unless Midnight rolls over
        PRINT Sec; RawData$,
    END IF
LOOP
$ENDIF
'======= end of demo 1 =================================
$IF 0
'demo2 ... unREM $IF0 & $ENDIF to run demo
'adapted from PowerBASIC manual, under COM(n) statement

CLS
ff=1                          'file handle # for COM
ON COM(ff) GOSUB GetComInput  'USE COM1:
DIM ComPortInput$(5*1024)    'allocate 5k buffer to store input
DIM InputTime(5*1024) as LONG
HeadPtr%=0: TailPtr=0        'pointers for the buffer
COM(ff) ON                    'turn on COM(n) trapping
'''$COM 1024                    'set up 1k input buffer
CALL StickOpenPort(ff)       '   this SUB could find a FREEFILE

PRINT "Press Esc to quit"
WHILE NOT INSTAT
    IF TailPtr%<>HeadPtr% THEN
        PRINT ComPortInput$(TailPtr%), InputTime(TailPtr), TIME$
        INCR TailPtr%  'step to next spot in buffer
    END IF
WEND
CLOSE  'close all open ports... see also COM(n) ON | OFF | STOP
END
'Routine to COM port interrupt
GetComInput:
    'Read 3 bytes from COM port buffer; & get clocktic #
    ComPortInput$(HeadPtr%)=StickData$(ff)
    InputTime(HeadPtr%) = Clocktic&
    INCR HeadPtr%      'advance storage buffer pointer
RETURN
$ENDIF
'============= end of demos =====================================
'clock tics since midnight
'(Exactly equal to ClockTic&=INT(TIMER*18.20648))
'system clock tick rate = 1,193,180 / 64k
'or 18.20648 times per sec
'in 24 hrs, ticks = 1,573,040 (or &H 1800B0)
Function ClockTic&
    ASM Mov ah, &h00
    ASM Int &h1a
    ASM Mov c%, cx
    ASM Mov d%, dx
    if d%<0 then
       ClockTic&=65536+d%+c%*65536
    else
       ClockTic&=d%+c%*65536
    end if
End Function

'This Function gets ALL bytes in the COM buffer and does not
' screen any of them for validity.
FUNCTION StickClearPort$(FileNum%)
    DIM RawData as STRING
    RawData$=""
    WHILE (LOC(FileNum%)>1)
        RawData$=RawData$+INPUT$(1, #FileNum%)
    WEND
    FUNCTION = RawData$
END FUNCTION

'Open serial port (#1 only) connection to stick; disable hand-shaking
'Note: Depending on the buffer LEN you give it, COM port will hold
'its data & you do not necessarily have to read it constantly. See
'e.g., S.C. Gates & J. Becker, "Laboratory automation for the IBM PC"
'for more details on this & on RS-232C protocol more generally.
SUB StickOpenPort(FileNum%)
    IF FileNum <1 then FileNum=FREEFILE
    '''$COM 2048    'put this in Main, to set up 2k input buffer
    OPEN "COM1:1200,N,8,1,rs,cs,ds,cd" for random as #FileNum%
    OUT &H3F,11 'for COM1... allows for 9th, parity, bit
    '''OUT &H2FB,11 'for COM2
END SUB

'SUB StickParseData processes ONE valid 3-byte data chunk.
'It will not parse all the data you might get after using SUB
'StickClearPort -- unless you call it repeatedly.
SUB StickParseData(RawData$, x%, y%) STATIC
  DIM byt as BYTE, byt2 as BYTE, byt3 as BYTE
  DIM xx as BYTE, yy as BYTE

  L=LEN(RawData$)

 'L should always be 3 & 1st char should be 1st byte,
 'but let's play it safe
  IF L<3 then
     x%=0: y%=0
     EXIT SUB  'note: we do not modify RawData$
  END IF

  'Data from the joy-stick are often repetitious; so...
  IF RawData$=LastData$ then
      x%=LastX: y%=LastY: EXIT SUB
  END IF

  FOR I=1 to L
      b$=MID$(RawData$,I,1)  'get 1 byte from Data string
      byt=ASC(b$)
      IF BIT(byt,6) THEN  'if we got the 1st byte of 3, then
         byt2=ASC(MID$(RawData$,I+1,1))  'get #2 also
         byt3=ASC(MID$(RawData$,I+2,1))  'and #3
         EXIT FOR
      END IF
  NEXT

ParseBytes:
  'Now translate the above 3 bytes into X,Y values, following
  'the protocol of Measurements Systems Inc. document El-312, p. 15

  xx=byt2   'bits 0-5 of byt2 are X; bits 6&7 are start & stop bits
  yy=byt3   'similarly for byt3 & Y
  'the 1st byte holds the most signif. digits of both X & Y
  IF BIT(byt,0) THEN BIT SET xx,6 ELSE BIT RESET xx,6
  IF BIT(byt,1) THEN BIT SET xx,7 ELSE BIT RESET xx,7
  IF BIT(byt,2) THEN BIT SET yy,6 ELSE BIT RESET yy,6
  IF BIT(byt,3) THEN BIT SET yy,7 ELSE BIT RESET yy,7
  'Bit 4 of byt is Right Button status; Bit 5 is Left Button...

  'xx/yy are "two's complement" numbers. translate that.
  'I won't swear this translation is right, but it seems to work.
  xx=xx-1: yy=yy-1
  FOR I=0 to 7
      BIT TOGGLE yy,I
      BIT TOGGLE xx,I
  NEXT

  IF xx >127 then
      x% = 255-xx  'move right
  ELSE
      x% = -xx     'move left
  END IF

  IF yy>127 then
      y% = 255-yy 'move down
  ELSE
      y% = -yy    'move up
  END IF
  'save for next time
  LastData$=RawData$
  LastX=x%
  LastY=y%
END SUB

'Get ONE 3-byte pack of raw data, making sure first byte
' is valid (cf Measurements Systems Inc. document El-312)
FUNCTION StickData$(FileNum%)
    DIM AllByte as STRING, b AS STRING, byt as BYTE
    DO WHILE (LOC(FileNum%)>1)
        b$=INPUT$(1, #FileNum%)
        byt=ASC(b$)
        IF BIT(byt,6) then 'first byte has bit 6 = 1
            AllByte$=b$+INPUT$(1, #FileNum%)+INPUT$(1, #FileNum%)
            EXIT DO
        END IF
    LOOP
    FUNCTION = AllByte$   'exactly 3 bytes
END FUNCTION

'SUB StickUnParse is the reverse of StickParseData;
'i.e., it translates xjoy, yjoy to a 3-byte string.
'It leaves x,y unchanged but changes RawData$
'Primarily for use in translating Mouse data into joystick format
SUB StickUnParse(RawData$, x%, y%)
  DIM byt as BYTE, byt2 as BYTE, byt3 as BYTE
  DIM xx as BYTE, yy as BYTE

  'translate X,Y vals into 3 bytes into X,Y values, following
  'the protocol of Measurements Systems Inc. document El-312, p. 15
  IF x% >=0 then
      xx = 255-x%  'move right
  ELSE
      xx = -x%     'move left
  END IF

  IF y%>=0 then
      yy = 255-y% 'move down
  ELSE
      yy = -y%    'move up
  END IF

  'xx/yy are "two's complement" numbers. translate that.
  'I won't swear this translation is right, but it seems to work.

  FOR I=0 to 7
      BIT TOGGLE yy,I
      BIT TOGGLE xx,I
  NEXT
  xx=xx+1: yy=yy+1

  'the 1st byte holds the most signif. digits of both X & Y
  IF BIT(xx,6) THEN BIT SET byt,0 ELSE BIT RESET byt,0
  IF BIT(xx,7) THEN BIT SET byt,1 ELSE BIT RESET byt,1
  IF BIT(yy,6) THEN BIT SET byt,2 ELSE BIT RESET byt,2
  IF BIT(yy,7) THEN BIT SET byt,3 ELSE BIT RESET byt,3
  'Bit 4 of byt is Right Button status; Bit 5 is Left Button...
  BIT SET byt,6 'designates 1st byte of 3
  BIT SET byt,7

  byt2=xx   'bits 0-5 of byt2 are X; bits 6&7 are start & stop bits
  byt3=yy   'similarly for byt3 & Y
  BIT RESET byt2,6
  BIT RESET byt3,6

  'EWM fudge factors...
  IF x%>=0 then
      BIT SET byt2, 7
  END IF
  if y%>=0 then
      BIT SET byt3, 7
  END IF

  RawData$=CHR$(byt)+CHR$(byt2)+CHR$(byt3)
    'WARNING! when x=0 or y=0, byt2 or byt3 are somtimes 128
    '& sometimes they are 129. This does not seem to be a serious
    'error but it should be corrected if Mouse data are important.
END SUB

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