' **********************************************************************
' ** Program: S1DEB8 -  Version : 1.1   -     8  March  1999          **
' ** Compilator :  BASCOM LT, (IDE V.1.20, LIB V.1.27)                **
' ** Card : GPC(r) F2                                                 **
' ** Firm:   grifo(r) ITALIAN TECHNOLOGY                              **
' ** Via Dell' Artigiano 8/6          40016 San Giorgio di Piano (BO) **
' ** Tel.+39 051 892 052     Fax +39 051 893 661                      **
' ** http://www.grifo.com    http://www.grifo.it                      **
' ** sales@grifo.it          tech@grifo.it          grifo@grifo.it    **
' **                                                                  **
' ** Developed by :  Enea Tassinari                                   **
' **********************************************************************
'
' This program allows to display an incremental counter on port.
' In order to make an easier visualization of the status lines, it is 
' necessary to get a 20 pins flat cable for connecting GPC(r)F2 CN2 
' connector to TIO 16 CN1 connector, or DEB 01 CN15 connector.
'
'***********************************************************************
'
'****************** Compiler directive *********************************
'
$romstart = &H8050                      ' address start of the code machine 
$ramstart = &HD000                      ' address start of the data area
$ramsize = &H2800                       ' put to 10K the data area
$crystal = 11059200                     ' clock frequency of the microcontroller
$baud = 9600                            ' RS-232 comunication speed
$large                                  ' address to 16 bit
'
'****************** Constant declaration *******************************
'
Dim Cnt As Const &HFA03                 ' register of command end control of the 82c55
Dim Pda As Const &HFA00                 ' data register of A port
Dim Pdb As Const &HFA01                 ' data register of B port
Dim Pdc As Const &HFA02                 ' data register of C port
'
'****************** Procedure declaration ******************************
'
Declare Sub Scritt_port(stato As Integer)' procedure for write on A and C port 
'
'****************** Dichiarazione delle variabili **********************
'
Dim Stato As Integer                    ' variable for the proceduret Scritt_port
Dim Valore As Word                      ' variable for write on the port
Dim Bytel As Word                       ' variable for the procedure Scritt_port
Dim Byteh As Word                       ' variable for the procedure Scritt_port
Dim Lett_pdb As Byte                    ' variable for read the B port 
Dim Val_pdb As Byte                     ' variable mask of the B port 
'
'************************* Program main ********************************
'
Main:
Waitms 1                                ' delay for signals arrangement
Out Cnt , 130                           ' program 0 mode, A-C port = output and B port = input
Out Pda , 255                           ' led off in the start time
Out Pdc , 255                           ' led off in the start time
Print
Print "         VISUALIZATION OF THE COUNTER LOOP IN PROGRESS "
Print " If switch 1 of the dip switch = off the counter is positive,"
Print "           if switch 1 = on the counter is negative "
Print
Print "                  RESET THE CARD FOR EXIT "
Print
   Scritt_port (&HFFFF)                 ' led of in the start time
   Lett_pdb = Inp(pdb)                  ' read the B port
   Val_pdb = Lett_pdb And 1             ' sensibilize only switch 1 of the dip switch
   If Val_pdb = 0 Then                  ' if yuo read 0 variable = 1
      Valore = 1
   Else
      Valore = &HFFFF                   ' if you read 1 variable = FFFFH
   End If
      Do
         Scritt_port (valore)           ' write on A-C port the contents of the variable 
         Waitms 100                     ' Delay of 100 ms
         Lett_pdb = Inp(pdb)            ' read the dip switch status
         Val_pdb = Lett_pdb And 1       ' sensibilize only switch 1
            If Val_pdb = 0 Then         ' read the B port status
               Valore = Valore + 1      ' increase the value           
            Else
               Valore = Valore - 1      ' decrease the value
            End If
       Loop
End
'
'************************ End main program *****************************
'

'
'**************************** Procedure ********************************
'
' Procedure for write on A and C port with only integer variable.
' data input:stato = port value
' data output:nothig
Sub Scritt_port (stato As Integer)
   Bytel = Stato And &HFF               ' mask the high byte 
   Byteh = Stato And &HFF00             ' mask the low byte
   Byteh = Byteh / 256                  ' shift the high byte in the low byte position
   Out Pda , Bytel                      ' write on A port the contents of the varaible bitel
   Out Pdc , Byteh
                                        ' write on the C port the contents of the variable byteh
End Sub
'