' **********************************************************************
' ** Program: gmbdae.BAS    -    Version : 1.1   -   14 June 2005     **
' ** Compiler : Bascom AVR IDE - LIB 1.11.7.4                         **
' ** Board : GMB HR168 and GMM AM32                                   **
' ** 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                                      **
' **********************************************************************
'
' 14.06.05 - 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:       M32
' HW Stack:   at least 64
' Soft Stack: at least 32
' Framesize:  at least 64
'
'
$regfile = "m32def.dat"
$crystal = 7372800
$baud = 19200
'
' ********************* Constans declarations *************************
'
Const Cret = 13                                             ' Codice di ritorno di carrello
Const Nl = 10                                               ' Codice nuova linea
Const Clrscr = 12                                           ' codice di clear screen
Const Bell = 7                                              ' codice di Bell
'
'****************** Variables declaration **********************
'
' Generic use
Dim S As Word , Char As Byte                                ' Generic use and SetPwm
Dim S1 As String * 1
Dim A As Eram Byte At 1023
'
'****************** Procedures declartion **********************
'
Declare Sub Init()                                          ' Initialization
Declare Function Leggi_char() As Byte                       ' Read one character (blocking)
Declare Sub Check_ready()
'
'************************** Main program ******************************
'
Main:

Do
   Call Init()
   Print Chr(clrscr)                                        ' Clear screen
   Print "Demo 1.1 for GMM AM32 + GMB HR168"
   Print
   Call Check_ready()                                       ' Check board 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 ******************************
'
'
' **************************** Procedures ******************************
'
'
' Initialize demo
'
Sub Init()
   Ddrd.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
'
'
' 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
'
'
' Check for hardware ready
'
Sub Check_ready()
Test:
   If A = &H55 Then
      Goto L2
   Else
      Goto Test
   End If
L2:
End Sub