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https://github.com/sehugg/8bitworkshop.git
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working on assembler
This commit is contained in:
Steven Hugg
parent
09fb489c2d
commit
e29bfb5f7e
@ -42,7 +42,7 @@ ga('send', 'pageview');
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<li><a class="dropdown-item" href="#" id="item_new_file">New File...</a></li>
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<li><a class="dropdown-item" href="#" id="item_share_file">Share File as GitHub Gist...</a></li>
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<li><a class="dropdown-item" href="#" id="item_reset_file">Revert to Original...</a></li>
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<li><a class="dropdown-item" href="#" id="item_download_file">Download File</a></li>
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<li><a class="dropdown-item" href="#" id="item_download_file">Download Source File</a></li>
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<li><a class="dropdown-item" href="#" id="item_download_rom">Download ROM Image</a></li>
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<li><a class="dropdown-item" href="#" id="item_record_video">Record Video...</a></li>
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<li class="dropdown dropdown-submenu">
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@ -7,9 +7,10 @@
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`include "sound_generator.v"
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`include "cpu16.v"
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module cpu_platform(clk, reset, hsync, vsync, rgb);
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module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
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input clk, reset;
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input hpaddle, vpaddle;
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output hsync, vsync;
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output [3:0] rgb;
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@ -114,9 +115,12 @@ module cpu_platform(clk, reset, hsync, vsync, rgb);
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wire [15:0] cpu_ram_addr;
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wire busy;
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wire [15:0] cpu_bus;
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wire [15:0] flags = {11'b0, vsync, hsync, vpaddle, hpaddle, display_on};
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assign cpu_bus = cpu_ram_addr[15]
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? program_rom[cpu_ram_addr[9:0]]
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? (cpu_ram_addr == 16'hffff)
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? flags
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: program_rom[cpu_ram_addr[9:0]]
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: ram_read;
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CPU16 cpu(
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@ -5,6 +5,7 @@
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"reg":{"bits":3, "toks":["ax", "bx", "cx", "dx", "ex", "fx", "sp", "ip"]},
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"unop":{"bits":3, "toks":["zero","loada","inc","dec","asl","lsr","rol","ror"]},
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"binop":{"bits":3, "toks":["or","and","xor","mov","add","sub","adc","sbb"]},
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"imm5":{"bits":5},
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"imm8":{"bits":8},
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"imm16":{"bits":16},
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"rel8":{"bits":8, "iprel":true, "ipofs":1}
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@ -24,6 +25,7 @@
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{"fmt":"push ~reg", "bits":["01010",0,"00000","110"]},
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{"fmt":"pop ~reg", "bits":["01001",0,"00001","110"]},
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{"fmt":"rts", "bits":["01001","111","00001","110"]},
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{"fmt":"mov ~reg,[~reg+~imm5]", "bits":["01001",0,2,1]},
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{"fmt":"jsr ~reg", "bits":["01110","111","00",0,"110"]},
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{"fmt":"jsr ~imm16", "bits":["0001110001011000",0,"0111011100100110"]},
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{"fmt":"jmp ~imm16", "bits":["0001111101011000",0]},
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@ -14,25 +14,44 @@
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.org 0x8000
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.len 1024
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.define ScreenBuffer $6000
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.define PageTable $7e00
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.define SpriteTable $7f00
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jmp Start
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Start:
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mov sp,@$6fff
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mov fx,@InitPageTable
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jsr fx
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mov ax,@$1ffe
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mov ax,@$0700
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mov fx,@ClearTiles
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; jsr ex
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jsr fx
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mov fx,@DrawMaze
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jsr fx
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mov bx,@HelloWorld
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mov cx,@$1f00
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mov cx,@$0200
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mov dx,@$6001
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mov fx,@WriteString
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jsr fx
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mov fx,@ClearSprites
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jsr fx
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reset
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mov fx,@InitSprites
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jsr fx
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GameLoop:
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mov fx,@WaitVSync
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jsr fx
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mov fx,@MoveSprites
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jsr fx
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jmp GameLoop
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WaitVSync:
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mov bx,@$FFFF
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mov ax,[bx]
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and ax,#16
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bz WaitVSync
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rts
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WriteString:
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mov ax,[bx]
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bz StringDone
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@ -45,7 +64,7 @@ StringDone:
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rts
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DrawMaze:
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mov dx,@$6040
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mov dx,@$6080
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mov bx,@MazeData
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DrawMazeLoop:
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mov ax,[bx]
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@ -65,20 +84,19 @@ ShiftMazeChar:
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and ex,#$f
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add ex,@MazeChars
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mov ex,[ex]
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or ex,@$1e00
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; store to video buffer
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mov [dx],ex
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inc dx
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dec fx
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bnz ShiftMazeChar
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mov ax,dx
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sub ax,@$6340
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sub ax,@$6380
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bnz DrawMazeLoop
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rts
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InitPageTable:
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mov ax,@$6000 ; screen buffer
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mov bx,@$7e00 ; page table start
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mov ax,@ScreenBuffer ; screen buffer
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mov bx,@PageTable ; page table start
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mov cx,#32 ; 32 rows
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InitPTLoop:
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mov [bx],ax
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@ -88,7 +106,7 @@ InitPTLoop:
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bnz InitPTLoop
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rts
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ClearTiles:
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mov bx,@$6000
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mov bx,@ScreenBuffer
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mov cx,@$3c0
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ClearLoop:
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mov [bx],ax
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@ -97,54 +115,126 @@ ClearLoop:
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bnz ClearLoop
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rts
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ClearSprites:
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mov bx,@$7f00
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mov ax,#0
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mov cx,#$40
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mov dx,@SpriteTable
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ClearSLoop:
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mov ax,[bx]
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add ax,@$101
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mov [bx],ax
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inc bx
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mov [dx],ax
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inc dx
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dec cx
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bnz ClearSLoop
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rts
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InitSprites:
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mov bx,@SpriteInitData
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mov cx,#10
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mov dx,@SpriteTable
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InitSLoop:
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mov ax,[bx]
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mov [dx],ax
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inc bx
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inc dx
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dec cx
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bnz InitSLoop
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rts
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MoveSprites:
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mov dx,@SpriteTable
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mov cx,#5
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MoveSLoop:
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mov ax,[dx] ; x/y pos
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mov bx,[dx+1] ; attributes/dir
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and bx,#3 ; bx = direction (0-3)
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add bx,@DirectionXY
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add ax,[bx] ; lookup & add to x/y
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; make sure we don't collide with wall
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mov ex,ax
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add ex,#$08
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lsr ex
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lsr ex
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lsr ex ; divide X by 8
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and ex,#31
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mov fx,ex
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mov ex,ax
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add ex,@$0800
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lsr ex
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lsr ex
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lsr ex
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lsr ex
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lsr ex
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lsr ex ; divide Y by 64
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and ex,@$ffe0
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or ex,fx
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add ex,@ScreenBuffer
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mov fx,[ex]
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and fx,@$ff00
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xor fx,@$0500
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bz DoNotUpdatePos
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; update x/y position
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mov [dx],ax ; store x/y pos
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inc dx
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inc dx
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NextSLoop:
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dec cx
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bnz MoveSLoop
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rts
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; Choose a new direction
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DoNotUpdatePos:
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mov bx,[dx+1] ; attributes/dir
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inc bx
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inc dx
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mov [dx],bx
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inc dx
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jmp NextSLoop
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HelloWorld:
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.string HELLO WORLD
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.data 0
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SpriteInitData:
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.data $8363 $3456
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.data $8373 $4567
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.data $8383 $5678
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.data $8373 $1234
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DirectionXY:
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.data $FFFF
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.data $0100
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.data $0001
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.data $FF00
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MazeData:
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.data $3111 $1111 $1111 $1114 $3111 $1111 $1111 $1114
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.data $2000 $0000 $0000 $0002 $2000 $0000 $0000 $0002
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.data $2031 $1114 $0311 $1402 $2031 $1140 $0311 $1402
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.data $2051 $1116 $0511 $1605 $6051 $1160 $0511 $1602
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.data $2031 $1114 $0311 $1402 $2031 $1140 $3111 $1402
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.data $2d51 $1116 $0511 $1605 $6051 $1160 $5111 $16d2
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.data $2000 $0000 $0000 $0000 $0000 $0000 $0000 $0002
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.data $2031 $1114 $0340 $3111 $1114 $0340 $0311 $1402
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.data $2051 $1116 $0220 $5114 $3116 $0220 $0511 $1602
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.data $2031 $1114 $0340 $3111 $1114 $0340 $3111 $1402
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.data $2051 $1116 $0220 $5114 $3116 $0220 $5111 $1602
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.data $2000 $0000 $0220 $0002 $2000 $0220 $0000 $0002
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.data $5111 $1114 $0251 $1402 $2031 $1620 $3111 $1116
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.data $3111 $1116 $0231 $1605 $6051 $1420 $5111 $1114
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.data $2000 $0000 $0220 $0000 $0000 $0220 $0000 $0002
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.data $2031 $1114 $0220 $3111 $1114 $0220 $0311 $1402
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.data $2051 $1116 $0560 $2ccc $ccc2 $0560 $0511 $1602
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.data $2031 $1114 $0220 $3111 $1114 $0220 $3111 $1402
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.data $2051 $1116 $0560 $2ccc $ccc2 $0560 $5111 $1602
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.data $2000 $0000 $0000 $2ccc $ccc2 $0000 $0000 $0002
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.data $5111 $1114 $0340 $2ccc $ccc2 $0340 $0311 $1116
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.data $3111 $1116 $0220 $5111 $1116 $0220 $0511 $1114
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.data $5111 $1114 $0340 $2ccc $ccc2 $0340 $3111 $1116
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.data $3111 $1116 $0220 $5111 $1116 $0220 $5111 $1114
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.data $2000 $0000 $0220 $0000 $0000 $0220 $0000 $0002
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.data $2031 $1114 $0251 $1403 $4031 $1620 $0311 $1402
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.data $2051 $1116 $0511 $1605 $6051 $1160 $0511 $1602
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.data $2000 $0000 $0000 $0000 $0000 $0000 $0000 $0002
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.data $2031 $1114 $0311 $1403 $4031 $1140 $0311 $1402
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.data $2051 $1116 $0511 $1602 $2051 $1160 $0511 $1602
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.data $2031 $1114 $0251 $1403 $4031 $1620 $3111 $1402
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.data $2051 $1116 $0511 $1605 $6051 $1160 $5111 $1602
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.data $2d00 $0000 $0000 $0000 $0000 $0000 $0000 $00d2
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.data $2031 $1114 $0311 $1403 $4031 $1140 $3111 $1402
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.data $2051 $1116 $0511 $1602 $2051 $1160 $5111 $1602
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.data $2000 $0000 $0000 $0002 $2000 $0000 $0000 $0002
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.data $5111 $1111 $1111 $1116 $5111 $1111 $1111 $1116
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MazeChars:
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.data $f9 ; empty
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.data $c4 $b3 ; horizvert
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.data $da $bf $c0 $d9 ; corners
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.data $c3 $c1 $c2 $b4 ; 3-way
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.data $c5 ; 4-way
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.data $20 ; empty (no dot)
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.data $07f9 ; empty
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.data $05c4 $05b3 ; horizvert
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.data $05da $05bf $05c0 $05d9 ; corners
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.data $05c3 $05c1 $05c2 $05b4 ; 3-way
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.data $05c5 ; 4-way
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.data $0720 ; empty (no dot)
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.data $07fe ; power pill
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.data 123 $123
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.align $10
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@ -48,10 +48,13 @@ var Assembler = function(spec) {
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var s = rule.fmt;
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var varlist = [];
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rule.prefix = s.split(/\s+/)[0];
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s = s.replace(/\+/g, '\\+');
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s = s.replace(/\*/g, '\\*');
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s = s.replace(/\s+/g, '\\s+');
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s = s.replace(/\[/g, '\\[');
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s = s.replace(/\]/g, '\\]');
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s = s.replace(/\./g, '\\.');
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// TODO: more escapes?
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s = s.replace(/~\w+/g, function(varname) {
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varname = varname.substr(1);
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var v = vars[varname];
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@ -117,7 +120,7 @@ var Assembler = function(spec) {
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nbits:width*data.length
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});
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for (var i=0; i<data.length; i++) {
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outwords[ip++ - origin] = data[i];
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outwords[ip++ - origin] = data[i] & ((1<<width)-1);
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}
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}
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