;***************************************************************************
; Application:  
; Author:       Dan Williams
; Date:         
; Assembler:    
; Target:       Atmel ATtiny13.
;***************************************************************************
;
; notes:
;
;****************************************************************************

.device ATtiny13 

; ------------- Memory locations ---------------
;
;  .def bar =r01 ; one byte ram location
;
; ----------------------------------------------

; R 0 ->15 are gen. purp.

.def A          = r16    
.def B          = r17   ;
.def C          = r18
.def D          = r19

.def _P         = r20   ; !!!???!!! change names as desired
.def _Q         = r21
.def _R         = r22
.def _S         = r23
.def _T         = r24
.def _U         = r25
.def _V         = r26
.def _w         = r27
.def _X         = r28
.def _Y         = r29
.def _Z         = r30


;cant use r25 -> r31

; ------------- Equates ------------------

.equ INPUT   = 0
.equ OUTPUT  = 1

; --- Port Directions ---
.equ PB0DIR  = OUTPUT ; !!!???!!! changeme
.equ PB1DIR  = OUTPUT
.equ PB2DIR  = OUTPUT
.equ PB3DIR  = INPUT
.equ PB4DIR  = INPUT
.equ PB5DIR  = OUTPUT

; --- Initial port state ---
.equ INPB0   = 0  ; !!!???!!! changeme
.equ INPB1   = 0
.equ INPB2   = 0
.equ INPB3   = 0
.equ INPB4   = 0
.equ INPB5   = 0

; --- Port Names ---
.equ PORT1    = 0  ;
.equ PORT2    = 1  ; !!!???!!! changeme's
.equ PORT3    = 2  ; 
.equ PORT4    = 3  ;
.equ PORT5    = 4  ;
.equ PORT6    = 5  ;

; --- amalgimate ---

.equ INITDIR   = ((PB5DIR<<DDB5)|(PB4DIR<<DDB4)|(PB3DIR<<DDB3)|(PB2DIR<<DDB2)|(PB1DIR<<DDB1)|(PB0DIR<<DDB0))
.equ INITSTATE = ((INPB5<<PORTB5)|(INPB4<<PORTB4)|(INPB3<<PORTB3)|(INPB2<<PORTB2)|(INPB1<<PORTB1)|(INPB0<<PORTB0))



;========================| SYSTEM VECTORS |===========================
;
.cseg                                   ;CODE segment
.org 0x0000
    rjmp    init   ; RESET 
    reti           ; EXT_INT0  
    reti           ; PCINT0   (pin change)
    reti           ; TIM0_OVF  
    reti           ; EE_RDY  
    reti           ; ANA_COMP  
    reti           ; TIM0_COMPA  
    reti           ; TIM0_COMPB  
    reti           ; WATCHDOG  
    reti           ; ADC  

;=============================| MAIN |================================
;


.org 0x000A
init:   
        ; Set up stack
        ldi     A,   low(RAMEND)        ; load low address of ram to R16...
        out     SPL, A               ; Set Stack Pointer to top of RAM

        ; Disable interrupts
        cli        

        ; Set up io ports
        ldi   A,    INITSTATE
        out   PORTB, A
        ldi   A,    INITDIR
        out   DDRB,  A      

MainLoup:
     
        
     
        rjmp    MainLoup                ; go back and do it all over again


;========================| SUBROUTINES |==============================
;