; main.a51 (Module #2)

;

; The following "$" commands must be included in every module

$NOMOD51 ; Omit assembler predefined registers.

$INCLUDE(reg515.inc) ; Include 515/535 microcontroller definitions.

NAME MAIN ; Optional parameter; if no name is provided,

; the filename will be used by default.

PUBLIC MAIN_LOOP ; Lets other modules access this section of code

; from "public domain" utilizing the EXTRN command.

EXTRN CODE (LCDOUT, DISPMENU, KPD, ALERT, ALERTMENU)

;EXTRN CODE (LOAD, SAVE)

; Makes subroutines LCDINIT and LCDOUT in the

; lcd.a51 module available to module main.a51 .

;***********************************************************************************

MAIN SEGMENT CODE ; Reserve RAM space for the generic code

; segment, MAIN. The name segment name is referred

; to by the following RSEG directive.

RSEG MAIN ; Selects the MAIN code segement, and makes it

; "active" at this point in assembled code.

; The selected segment remains "active" until

; a different segment is specified.

USING 0 ; Indicates to the assembler that register

; bank 0 will be used, but does not actually

; select register bank 0 .

; The module main.a51 should be used primarily to call subroutines in the

; various modules in the project, as opposed to incorporating detailed functions

; within module main.a51 (i.e., main.a51 should be relatively short).

MAIN_LOOP:

CALL DISPMENU

CALL KPD

CJNE A,#31h,SV

CALL ALERTMENU ;ALERT

SV:

CJNE A,#32h,LD

;CALL SAVE

LD:

;CALL LOAD

;CALL LCDOUT ; The call to LCDOUT is possible because

; subroutine LCDOUT has been made public, and

; has been defined as external code in

; module lcd.a51 .

LOOP:

JMP LOOP ; Infinite loop.

END