
'============================================================
'
' ************************************
' ***                              ***
' *** Drehlicht    18.05.2014      ***
' ***                              ***
' ************************************
'
'name                      : Drehlicht.bas
'purpose                   : Drehlicht mit 4 LEDs
'µC                        : ATtiny13
'
'============================================================
'

$regfile = "attiny13.dat"
$crystal = 300000
$hwstack = 20
$swstack = 20
$framesize = 12


Config Portb.0 = Output
Config Portb.1 = Output
Config Portb.2 = Output
Config Portb.3 = Output

Led1_pin Alias Portb.0
Led2_pin Alias Portb.1
Led3_pin Alias Portb.2
Led4_pin Alias Portb.3

Const Fade_up = 3
Const Fade_down = 3
Const Hold = 3
Const Pause = 3

Dim Led1 As Byte
Dim Led2 As Byte
Dim Led3 As Byte
Dim Led4 As Byte
                                                               'Auflösung 0 - 49
Dim Timerzaehler As Byte                                    'Maximalwerte wie LED1


Config Timer0 = Timer , Prescale = 8                        'Timer konfigurieren
On Timer0 Timerroutine                                      'Timerinterrupt Subroutine zuweisen
Enable Timer0                                               'Timer aktivieren
Start Timer0                                                'Timer starten
Timer0 = 205                                                'Timer vorladen

Enable Interrupts                                           'Interrupt aktivieren
Portb = 0

'*** Hauptschleife *************************************************************

Do


   For Led1 = 0 To 49
      If Led4 < 21 Then                                     'Werte begrenzen um Timerüberläufe abzufangen
         If Led4 > 0 Then Decr Led4.                        'Werte begrenzen um Timerüberläufe abzufangen, DED4 weiter abdimmen
      End If
      Waitms Fade_up                                        'aufdimmen
   Next Led1

   Waitms Hold                                              'halten

   For Led1 = 49 To 20 Step -1                              'abdimmen
      Waitms Fade_down
   Next Led1
   Waitms Pause                                             'Pause
'======================================
   For Led2 = 0 To 49
      If Led1 < 21 Then
         If Led1 > 0 Then Decr Led1.
      End If
      Waitms Fade_up
   Next Led2

   Waitms Hold

   For Led2 = 49 To 20 Step -1
      Waitms Fade_down
   Next Led2
   Waitms Pause
'======================================
   For Led3 = 0 To 49
      If Led2 < 21 Then
         If Led2 > 0 Then Decr Led2.
      End If
      Waitms Fade_up
   Next Led3

   Waitms Hold

   For Led3 = 49 To 20 Step -1
      Waitms Fade_down
   Next Led3
   Waitms Pause
'======================================
   For Led4 = 0 To 49
      If Led3 < 21 Then
         If Led3 > 0 Then Decr Led3.
      End If
      Waitms Fade_up
   Next Led4

   Waitms Hold

   For Led4 = 49 To 20 Step -1
      Waitms Fade_down
   Next Led4
   Waitms Pause



Loop

                                               'Ende Hauptschleife
End


'*** Subs **********************************************************************
Timerroutine:                                               'Beginn Subroutine
   Timer0 = 205
   Incr Timerzaehler
   If Timerzaehler = 49 Then Timerzaehler = 0               'Timerzaehler auf LED-Auflösung begrenzen
   If Timerzaehler < Led1 Then Led1_pin = 1 Else Led1_pin = 0       'Vergleich Timerzähler mit LED-Wert -> LED Ein- od. Ausschalten
   If Timerzaehler < Led2 Then Led2_pin = 1 Else Led2_pin = 0
   If Timerzaehler < Led3 Then Led3_pin = 1 Else Led3_pin = 0
   If Timerzaehler < Led4 Then Led4_pin = 1 Else Led4_pin = 0
Return