' **********************************************************************
' ** Program: gmbdae.BAS    -    Version : 1.1   -   20 June 2005     **
' ** Compiler : Bascom AVR IDE - LIB 1.11.7.4                         **
' ** Board : GMB HR168 and GMM AM128                                  **
' ** Society: 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                      **
' ** Written by:  Graziano Gaiba                                      **
' **********************************************************************
'
' 20.06.05 - Rel 1.1 By Graziano Gaiba
' This demo uses Timer 1 of Mini Module to generate, on CN7, a PWM signal
' with preset frequency and duty cycle programmable in percent by console.
' Such signal, connected to an opportune intergrating circuit (RC network,
' operational amplifire with capacitor on feedback, etc.) allows to obtain an
' anlog signal like the one of a D/A. Demo execution depends on which Mini
' Module is used and serial line configuration.
'
'   Compiled file is smaller than 2048 bytes, so it can becompliled with free
'   demo of BASCOM AVR.
'
'
' !!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
' In menu Options | Compiler | Chip, set:
'
' Chip:       M128
' HW Stack:   at least 64
' Soft Stack: at least 32
' Framesize:  at least 64
'
'
$regfile = "m128def.dat"
$crystal = 7372800
$baud = 19200
'
' ********************* Constans declarations *************************
'
Const Cret = 13                                             ' Carriage return
Const Nl = 10                                               ' New line
Const Clrscr = 12                                           ' Clear screen
Const Bell = 7                                              ' Bell

' Time out in case a TWI command receives no response
Const Ee_timeout = 50000
'
'****************** Variables declaration **********************
'
' Generic use
Dim S As Word , Char As Byte                                ' Generic use and SetPwm
Dim S1 As String * 1
'
'****************** Procedures declartion **********************
'
Declare Sub Init()                                          ' Initialization
Declare Sub Set_relays_out(byval V As Byte)                 ' Set relays status
Declare Function Leggi_char() As Byte                       ' Read one character (blocking)
Declare Sub Check_ready()
Declare Function Check_ready_2() As Byte
'
'************************** Main program ******************************
'
Main:

Do
   Call Init()                                              ' Initialize module
   Portf.4 = 1                                              ' Turn OFF relays
   Portf.5 = 1
   Portf.6 = 1
   Portf.7 = 1
   Portb.3 = 1
   Portb.2 = 1
   Portb.1 = 1
   Porte.2 = 1
   Print Chr(clrscr);                                       ' Clears the screen
   Print "Demo 1.1 for GMM AM128 + GMB HR168"
   Print
   Call Check_ready()
   Print
   Print "Timer 1 is configured as 10 bit PWM (output on pin 6 of CN7 on GMB HR168)."
   Do
      Inputhex "Duty cycle in hex (E.g. 300): " , S
      Ocr1ah = High(s)                                      ' Set duty cycle
      Ocr1al = Low(s)
       Print "E to exit or any other key to re-set duty cycle"
      Char = Leggi_char()
   Loop Until Char = "E"
   Tccr1b = 0                                               ' Stop Timer 1
Loop
End
'
'************************ Program end ***************************
'
'
'******************************************************************************
'*                           Demo specific procedures                         *
'******************************************************************************
'
'
' Initialize demo
'
Sub Init()
' Initializes directionality of ports that drive optocouped inputs and relay
' outputs:
' IN1-1 - Portb.7
' IN2-1 - Portb.6
' IN3-1 - Porte.4
' IN4-1 - Porte.5
' IN5-1 - Portd.7
' IN6-1 - Porte.6
' IN7-1 - Portb.4
' IN8-1 - Portb.0
   Ddrb.7 = 0
   Ddrb.6 = 0
   Ddre.4 = 0
   Ddre.5 = 0
   Ddrd.7 = 0
   Ddre.6 = 0
   Ddrb.4 = 0
   Ddrb.0 = 0
' IN1-2 - Portc.0
' IN2-2 - Portc.1
' IN3-2 - Portc.2
' IN4-2 - Portc.3
' IN5-2 - Portc.4
' IN6-2 - Portc.5
' IN7-2 - Portc.6
' IN8-2 - Portc.7
   Ddrc = 0
' OUT A1 - Portf.4
' OUT A2 - Portf.5
' OUT B1 - Portf.6
' OUT B2 - Portf.7
' OUT C1 - Portb.3
' OUT C2 - Portb.2
' OUT D1 - Portb.1
' OUT D2 - Porte.2 (by default, that is J10 in 3-4)
   Ddrf.4 = 1
   Ddrf.5 = 1
   Ddrf.6 = 1
   Ddrf.7 = 1
   Ddrb.3 = 1
   Ddrb.2 = 1
   Ddrb.1 = 1
   Ddre.2 = 1

   Ddrb.5 = 1                                               ' Set portd.5 as output
   Ocr1ah = &H02
   Ocr1al = &H00

   Tcnt1h = 0                                               ' Reset timer
   Tcnt1l = 0
   ' Timer 1 configured for Fast PWM, No Prescaler, toggles 1 pin 6 of CN7
   ' on every match between register OCR1A and counter register of Timer 1, does
   ' not use OCR1B.
   Tccr1a = &H83
   ' Start Timer 1
   Tccr1b = &H09
End Sub
'
'******************************************************************************
'*                              Generic procedures                            *
'******************************************************************************
'
'
'
' Reads a character in blocking way,converts it in capital letter and prints it
'
Function Leggi_char() As Byte

   Local C As Byte

   C = Waitkey()
   Print Chr(c)
   C = C And &HDF                                           ' Converts ASCII character in capital letter

   Leggi_char = C
End Function
'
'
' Supporting function for Check_ready().
'
Function Check_ready_2() As Byte

  Local Time_out As Word , I As Byte

  Time_out = 0                                              ' Timeout counter
  Do
     Incr Time_out                                          ' Increment counter
  Loop Until Twcr.twint = 1 Or Time_out = Ee_timeout
  I = Twsr
  I = I And &HF8
  Check_ready_2 = I
End Function
'
'
' Check for card ready
'
Sub Check_ready()

   Local Check As Byte , Test As Byte

   Do                                                       ' Loop to check for card ready
      Twsr = Twsr And &HFC
      Check = Twdr Or &HF4
      Test.4 = Not Check.3
      Twbr = 72
      Twcr = &HA4
      Check = Check_ready_2()
      Test = Check Or Twcr
      If Check = &H09 Then
         Test = &H67
      Else
         Test.1 = Not Test.1
      End If
      Twdr = &HA0
      Twcr = &H84
      Check = Check_ready_2()
      Twcr = &H94
      Waitms 27
   Loop Until Check = &H18 Or Test <> 1
   Twcr.twen = 0
End Sub