;********************************************************************************
; @module system
; @type header
; @details
;   Variable definitions for the current hardware setup
;********************************************************************************

.ifndef INCLUDE_SYSTEM
INCLUDE_SYSTEM = 1
; reserved RAM addresses
; 00-0f - free
; 10-1f - arguments / return values
; 20-ff - free
; 0100 - 01FF Stack
; 0200,0201 keybuffer write/read pointer
; 0202-02ff keybuffer
; 0300 lcd character counter
; 0400, 0401, 0402 dht status, dht bit, dht_bit_rot
; 0403 value offset
; 0405-04a0 rh high/low, temp high/low, checksum

.include "io_W65C22.h65"
.include "utility.h65"

; ARGUMENTS
; a,x,y can also be used 
ARG0    = $10
ARG1    = $11
ARG2    = $12
ARG3    = $13
ARG4    = $14
ARG5    = $15
ARG6    = $16
ARG7    = $17
ARG8    = $18
ARG9    = $19
ARG10   = $1a
ARG11   = $1b
ARG12   = $1c
ARG13   = $1d
ARG14   = $1e
ARG15   = $1f


; RETURN VALUE 
; in a

.segment "VIA1"
; IO1:    .res 16
IO1     = $6000

.segment "VIA2"
; IO2:    .res 16
IO2     = $7000

.endif ; include guard