Help wanted to implement a switch in my code

Archiver

Hi..

I am a newcomer and I need starting help.

Can anybody show me how I imlement three pushbuttons in my code?
Like this:

First pushbutton:
(to step thru the colours)

Push 1 = red only
Push 2 = red and green only
Push 3 = green only
Push 4 = green and blue only
Push 5 = blue only
Push 6 = red and blue only
Push 7 = start the sequenz
Push 8 = off

Second pushbutton: (changed the worth named "a")

Push = Speed up

Third pushbutton: (changed the worth named "a")

Push = speed down

And this is my code:

---

cut

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'
======================================================================
'
' Changes the brightness of LED`s using PWM
'
' {$STAMP BS2}
'
======================================================================

Pin0 CON 0 'LED red
Pin1 CON 1 'LED green
Pin2 CON 2 'LED blue

level VAR Byte

a VAR Byte

'

---

DlyTm CON 0 'Pause

a = 1 'Steps

'

---

Main:

High Pin0 'LED red on / red on
Low Pin1 'LED green off
Low Pin2 'LED blue off

Loop:

FOR level = 0 TO 255 Step a 'LED green up / red and green on
PWM Pin1,level,25
PAUSE DlyTm
NEXT

FOR level = 255 TO 0 Step a 'LED red down / green on
PWM Pin0,level,25
PAUSE DlyTm
NEXT

Low Pin0 'LED red off

FOR level = 0 TO 255 Step a 'LED blue up / green and blue on
PWM Pin2,level,25
PAUSE DlyTm
NEXT

FOR level = 255 TO 0 Step a 'LED green down / blue on
PWM Pin1,level,25
PAUSE DlyTm
NEXT

Low Pin1 'LED green off

FOR level = 0 TO 255 Step a 'LED red up / blue and red on
PWM Pin0,level,25
PAUSE DlyTm
NEXT

FOR level = 255 TO 0 Step a 'LED blue down / red on
PWM Pin2,level,25
PAUSE DlyTm
NEXT

Low Pin2 'LED blue off

GOTO Loop

END

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cut

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Thanks for help.

Best regards, Kai