********************************************************************
* Clock2 - Disto 2-N-1 RTC Driver
*
* $Id$
*
* Edt/Rev  YYYY/MM/DD  Modified by
* Comment
* ------------------------------------------------------------------
*   1      2004/08/18  Boisy G. Pitre
* Separated clock2 modules for source clarity.

         nam   Clock2    
         ttl   Disto 2-N-1 RTC Driver

         ifp1            
         use   defsfile  
         endc            

tylg     set   Sbrtn+Objct
atrv     set   ReEnt+rev
rev      set   $00
edition  set   1

RTC.Base equ   $FF50      Base address of clock

         mod   eom,name,tylg,atrv,JmpTable,RTC.Base

name     fcs   "Clock2"
         fcb   edition

         IFNE  MPIFlag   
SlotSlct fcb   MPI.Slot-1 Slot constant for MPI select code
         ENDC            

JmpTable                 
         rts			RTC Init
         nop
         nop
         bra   GetTime		RTC Get Time
         nop             
         bra   SetTime   	RTC Set Time

GetTime  pshs  a,cc       Save old interrupt status and mask IRQs
         bsr   RTCPre    

         bsr   GetVal     Get Year
         bsr   GetVal     Get Month
         bsr   GetVal     Get Day
         decb             ldb #5
         stb   2,x       
         decb            
         lda   ,x        
         anda  #3        
         bsr   GetVal1    Get Hour
         bsr   GetVal     Get Minute
         bsr   GetVal     Get Second

RTCPost  clr   >$FFD9     2 MHz  (Really should check $A0 first)
         puls  cc,b      

         IFNE  MPIFlag   
         stb   >MPI.Slct  Restore saved "currently" selected MPak slot
         ENDC            

         clrb            
         rts             

RTCPre   orcc  #IntMasks 

         IFNE  MPIFlag   
         ldb   >MPI.Slct  Save currently selected MPak slot on stack
         stb   3,s       
         andb  #$F0      
         orb   >SlotSlct,pcr Get slot to select
         stb   >MPI.Slct  Select MPak slot for clock
         ENDC            

         ldy   #D.Time   
         ldx   M$Mem,pcr 
         clr   1,x       
         ldb   #12       
         clr   >$FFD8     1 MHz
         rts             

GetVal   stb   2,x       
         decb            
         lda   ,x         read tens digit from clock
         anda  #$0f      
GetVal1  pshs  b          save b
         ldb   #10       
         mul              multiply by 10 to get value
         stb   ,y         save 10s value
         puls  b          set up clock for ones digit
         stb   2,x       
         decb            
         lda   ,x         read ones digit from clock
         anda  #$0f      
         adda  ,y         add ones + tens
         sta   ,y+        store clock value into time packet
         rts             


SetTime  pshs  a,cc      
         lbsr  RTCPre     Initialize

         bsr   SetVal     Set Year
         bsr   SetVal     Set Month
         bsr   SetVal     Set Day
         ldd   #$0805     $08 in A, $05 in B
         bsr   SetVal1    Set Hour   (OR value in A ($08) with hour)
         bsr   SetVal     Set Minute
         bsr   SetVal     Set Second

         lbra  RTCPost    Clean up + return

SetVal   clra            
SetVal1  stb   2,x        Set Clock address
         decb            
         pshs  b         
         ldb   ,y+        Get current value
DvLoop   subb  #10        Get Tens digit in A, ones digit in B
         bcs   DvDone    
         inca            
         bra   DvLoop    
DvDone   addb  #10       
         sta   ,x         Store tens digit
         tfr   b,a       
         puls  b          Get back original clock address
         stb   2,x       
         decb            
         sta   ,x         Store ones digit
         rts             

         emod            
eom      equ   *         
         end