Subversion Repositories zipcpu

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;
; Filename:     pcpc.S
;
; Project:      Zip CPU -- a small, lightweight, RISC CPU soft core
;
; Purpose:      A quick test of whether or not the busy command works.
;               The test does not report success or failure, so you will need
;               to observe it in a simulator to know if it worked or not.
;
; Creator:      Dan Gisselquist, Ph.D.
;               Gisselquist Technology, LLC
;
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;
; Copyright (C) 2015, Gisselquist Technology, LLC
;
; This program is free software (firmware): you can redistribute it and/or
; modify it under the terms of  the GNU General Public License as published
; by the Free Software Foundation, either version 3 of the License, or (at
; your option) any later version.
;
; This program is distributed in the hope that it will be useful, but WITHOUT
; ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
; for more details.
;
; License:      GPL, v3, as defined and found on www.gnu.org,
;               http://www.gnu.org/licenses/gpl.html
;
;
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start:
        LDI     $1,R0
        MOV     $1(R0),R1
        MOV     $2(R0),R2
        MOV     $3(R0),R3
        MOV     $4(R0),R4
        MOV     $5(R0),R5
        MOV     $6(R0),R6
        MOV     $7(R0),R7
        MOV     $8(R0),R8
        MOV     $9(R0),R9
        MOV     $10(R0),R10
        MOV     $11(R0),R11
        MOV     $12(R0),R12
        MOV     $13(R0),R13     ; R14 is CC, R15 is PC
        LDI     $0,R0
        BUSY                    ; This should create an endless loop here
        ; MOV   R0,R0
        ; MOV   R0,R0
        ; MOV   R0,R0           ; By this point, the loop should've started
        LDI     $10,R0          ; If we ever get here, we've got problems
        ADD     $1(R0),R1
        ADD     $2(R0),R2
        ADD     $3(R0),R3
        MOV     R0,R0
        MOV     R0,R0           ; If we ever get here, we've got problems
        HALT