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[/] [zipcpu/] [trunk/] [bench/] [asm/] [helloworld.S] - Blame information for rev 69

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Line No. Rev Author Line
1 12 dgisselq
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; Filename:     helloworld.S
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;
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; Project:      Zip CPU -- a small, lightweight, RISC CPU soft core
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;
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; Purpose:      A test of whether or not we can scroll a message on a
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;               seven segment display.  This depends upon the seven segment
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;               display driver (not included) being installed at position
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;               0x15 in memory.  If so, this scrolls the message:
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;               "HELLO UJorld." across the 4 seven segment display digits.
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;
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;               This test discovered that right shifting by 31 or more did
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;               not result in zero as desired.  It also discovered that the
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;               .DAT assembly instruction did not function as desired.  Both
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;               bugs were fixed to get this to work.
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;
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; Creator:      Dan Gisselquist, Ph.D.
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;               Gisselquist Technology, LLC
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; Copyright (C) 2015, Gisselquist Technology, LLC
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;
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; This program is free software (firmware): you can redistribute it and/or
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; modify it under the terms of  the GNU General Public License as published
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; by the Free Software Foundation, either version 3 of the License, or (at
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; your option) any later version.
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;
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; This program is distributed in the hope that it will be useful, but WITHOUT
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; ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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; for more details.
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;
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; License:      GPL, v3, as defined and found on www.gnu.org,
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;               http://www.gnu.org/licenses/gpl.html
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;
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; Register map
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;       R12 peripherals
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;       R11  timer length
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;       R10  value to clear/reset the PIC
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;       uR12 = memory
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;       uR11 = rawsseg
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;       uR9  = state
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;       R8   = new value for SSEG
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build_supervisor_state:
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        CLR     R12             ; Load a pointer to our peripherals
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        LDIHI   $c000h,R12
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        LDI     $5f5e1h,R11     ; An amount to reset the timer to: 1/4 sec
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        LSL     $6,R11
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        LDIHI   $8010h,R10      ; A value to clear/reset the PIC for timerA ints
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        LDILO   $ffffh,R10
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        MOV     $1+PC,uR12      ; User memory (so this isn't supervisor state..)
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        BRA     $4
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        .DAT    $0x6e9e1c1c     ; Raw SSEG for 'HELL'
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        .DAT    $0xfc007c70     ; Raw SSEG for 'O UJ'
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        .DAT    $0x3a0a607b     ; Raw SSEG for 'orld.'
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        .DAT    $0x00000000     ; Raw SSEG for '    '
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build_user_state:
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        LDI     $15h,R0
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        MOV     R0,uR11
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        MOV     $6+PC,uPC
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        CLR     R0
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        MOV     R0,uR9
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repeat:
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        STO     R11,$4(R12)     ; Reset the timer
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        STO     R10,(R12)       ; Reset the PIC
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        RTU
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        BRA     $-4
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user_task:
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        MOV     R9,R0
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        LSR     $2,R0
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        ADD     R12,R0
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        LOD     (R0),R8         ; Read the left word
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        MOV     R9,R1           ; Rotate it into place
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        AND     $3,R1
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        LSL     $3,R1           ; Multiply by eight
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        LSL     R1,R8           ; Shift words to left by 0,8,16,24 bits
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        ADD     $1,R0           ; Calculate address of next word
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        CMP     $4+R12,R0
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        SUB.GE  $4,R0
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        LOD     (R0),R2         ; Load the next word into a building location
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        LDI     $32,R3
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        SUB     R1,R3
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        LSR     R3,R2
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        OR      R2,R8           ; Put the two together
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        STO     R8,(R11)        ; Store the result
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        ADD     $1,R9           ; Increment our state
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        AND     $15,R9
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        WAIT                    ; Wait for the next interrupt
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        BRA     $-21            ; Back up to the top to start over
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        BREAK
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        BREAK
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        BREAK

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