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TriOS-alt/demo/VGA_JB_Demo - Archive [Dat.../VGA_JB_001.spin

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2010-11-26 23:58:06 +01:00
<EFBFBD><EFBFBD>''***************************************
''* VGA Driver v1.1 *
''* Original Author: Chip Gracey *
''* Modified for 256x240 64colour by *
''* Jim Bagley *
''* Removed original comments as *
''* timing is very tight, so do not *
''* alter code, hence comment removal *
''* Have left OR pixels,coloror in the *
''* unrolled loop because it protects *
''* against invalid colours for novice *
''* usage. *
''* Copyright (c) 2006 Parallax, Inc. *
''* and (c) 2010 Jim Bagley. *
''* See end of file for terms of use. *
''***************************************
_clkmode = xtal1 + pll16x ' enable external clock and pll times 16
_xinfreq = 5_000_000 ' set frequency to 5 MHZ
VAR
long cog
PUB start(vgaptr) : okay
stop
okay := cog := 7
coginit(cog,@entry, vgaptr)
' okay := cog := cognew(@entry, vgaptr) + 1
PUB stop
'' Stop VGA driver - frees a cog
if cog
cogstop(cog~ - 1)
DAT
'********************************
'* Assembly language VGA driver *
'********************************
org
'
' Entry
'
entry mov taskptr,#tasks 'reset tasks
mov x,#8 'perform task sections initially
:init jmpret taskret,taskptr
djnz x,#:init
'
' Superfield
'
superfield mov hv,hvbase 'set hv
mov interlace,#0 'reset interlace
test _mode,#%0100 wz 'get interlace into nz
'
' Field
'
field wrlong visible,par 'set status to visible
mov t1,par
add t1,#4
mov linenum,#0 'clear cog line counter
mov cogline,#0 'clear cog line counter
mov pixelptr,pixelbase
tjz vb,#:nobl 'do any visible back porch lines
mov x,vb
call #blank_line
:nobl
mov y,#240 'set vertical tiles
:line mov vx,#2 'set vertical expand
:vert if_nz xor interlace,#1 'interlace skip?
if_nz tjz interlace,#:skip
' wrlong cogline,nextlineptr
tjz hb,#:nobp 'do any visible back porch pixels
mov vscl,hb
waitvid bordercol,#0
:nobp
mov vscl,myhx 'set horizontal expand
mov pixelpush,pixelptr
add pixelptr,#4
'{
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
rdlong pixels,pixelptr
or pixels,coloror
waitvid pixels,#%%3210
add pixelptr,#4
mov pixelptr,pixelpush
'}
tjz hf,#:nofp 'do any visible front porch pixels
mov vscl,hf
waitvid bordercol,#0
:nofp
mov x,#1 'do hsync
call #blank_hsync '(x=0)
:skip djnz vx,#:vert 'vertical expand?
wrlong linenum,nextlineptr
add linenum,#1
add pixelptr,#256+8
add cogline,#1
cmp cogcount,cogline wc
if_c mov cogline,#0
if_c mov pixelptr,pixelbase
djnz y,#:line wc 'another tile line? (c=0)
tjz vf,#:nofl 'do any visible front porch lines
mov x,vf
call #blank_line
:nofl
if_nz xor interlace,#1 wc,wz 'get interlace and field1 into nz (c=0/?)
if_z wrlong invisible,par 'unless interlace and field1, set status to invisible
mov taskptr,#tasks 'reset tasks
addx x,_vf wc 'do invisible front porch lines (x=0 before, c=0 after)
call #blank_line
mov x,_vs 'do vsync lines
call #blank_vsync
mov x,_vb 'do invisible back porch lines, except last
call #blank_vsync
if_nz jmp #field 'if interlace and field1, display field2
jmp #superfield 'else, new superfield
'
' Blank line(s)
'
blank_vsync cmp interlace,#2 wc 'vsync (c=1)
blank_line mov vscl,h1 'blank line or vsync-interlace?
if_nc add vscl,h2
if_c_and_nz xor hv,#%01
if_c waitvid hv,#0
if_c mov vscl,h2 'blank line or vsync-normal?
if_c_and_z xor hv,#%01
bcolor waitvid hv,#0
if_nc jmpret taskret,taskptr 'call task section (z undisturbed)
blank_hsync mov vscl,_hf 'hsync, do invisible front porch pixels
waitvid hv,#0
mov vscl,_hs 'do invisble sync pixels
xor hv,#%10
waitvid hv,#0
mov vscl,_hb 'do invisible back porch pixels
xor hv,#%10
waitvid hv,#0
djnz x,#blank_line wc '(c=0)
movd bcolor,#hv
blank_hsync_ret
blank_line_ret
blank_vsync_ret ret
'
'
' Tasks - performed in sections during invisible back porch lines
'
tasks
mov t1,par
add t1,#4
rdlong pixelbase,t1
add t1,#4
rdlong nextlineptr,t1
add t1,#4
rdlong _enable,t1
add t1,#4
rdlong cogcount,t1
sub cogcount,#1
mov t3,_pins
mov t1,#2 'set video pins and directions
shl t1,_pins '(if video disabled, pins will drive low)
sub t1,#1
test _pins,#$20 wc
and _pins,#$38
shr t1,_pins
movs vcfg,t1
shl t1,_pins
shr _pins,#3
movd vcfg,_pins
if_nc mov dira,t1
if_nc mov dirb,#0
if_c mov dira,#0
if_c mov dirb,t1 '+14
mov _pins,t3
tjz _enable,#disabled '+2, disabled?
jmpret taskptr,taskret '+1=181, break and return later
rdlong t1,#0 'make sure CLKFREQ => 16MHz
shr t1,#1
cmp t1,m8 wc
if_c jmp #disabled '+8
mov t3,_rate
min _rate,pllmin 'limit _rate to pll range
max _rate,pllmax '+2
mov t1,#%00001_011 'set ctra configuration
:max cmp m8,_rate wc 'adjust rate to be within 4MHz-8MHz
if_c shr _rate,#1 '(vco will be within 64MHz-128MHz)
if_c add t1,#%00000_001
if_c jmp #:max
:min cmp _rate,m4 wc
if_c shl _rate,#1
if_c sub x,#%00000_001
if_c jmp #:min
movi ctra,t1 '+22
rdlong t1,#0 'divide _rate/CLKFREQ and set frqa
mov hvbase,#32+1
:div cmpsub _rate,t1 wc
rcl t2,#1
shl _rate,#1
djnz hvbase,#:div '(hvbase=0)
mov frqa,t2 '+136
mov _rate,t3
test _mode,#%0001 wc 'make hvbase
muxnc hvbase,vmask
test _mode,#%0010 wc
muxnc hvbase,hmask '+4
jmpret taskptr,taskret '+1=173, break and return later
mov h1,_hd
neg h2,_hf
sub h2,_hs
sub h2,_hb
sub h1,h2
shr h1,#1
addx h2,h1
mov hf,#0
mov hb,#0
mov vf,#0
mov vb,#0
movi vcfg,#%01100_000 '+1, set video configuration
:colors jmpret taskptr,taskret '+1=114/160, break and return later
jmp #:colors '+1, keep loading colors
'
' Disabled - reset status, nap ~4ms, try again
'
disabled mov ctra,#0 'reset ctra
mov vcfg,#0 'reset video
wrlong outa,par 'set status to disabled
rdlong t1,#0 'get CLKFREQ
shr t1,#8 'nap for ~4ms
min t1,#3
add t1,cnt
waitcnt t1,#0
jmp #entry 'reload parameters
'
'
' Initialized data
'
vcfgval long %0_01_0_00_000_000000000000_010_0_11111111
threems long $30000
sync_cnt long 0
pllmin long 500_000 'pll lowest output frequency
pllmax long 128_000_000 'pll highest output frequency
m8 long 8_000_000 '*16 = 128MHz (pll vco max)
m4 long 4_000_000 '*16 = 64MHz (pll vco min)
d0 long 1 << 9 << 0
d6 long 1 << 9 << 6
invisible long 1
visible long 2
vmask long $01010101
hmask long $02020202
coloror long $03030303
bordercol long $03
myhx long (2<<12)+8
' %aabbb --> aa = pingruppe, bbb = anzahl pins
'_pins long %10111 'pins (demoboard)
_pins long %01111 'pins (hive)
_mode long %1000 'mode
_hd long 512 'hd
_hf long 10 'hf
_hs long 76 'hs
_hb long 42 'hb
_vd long 480 'vd
_vf long 7 'vf
_vs long 2 'vs
_vb long 35 'vb
_rate long 20_000_000 'rate
'
' Uninitialized data
'
linenum res 1
pixelbase res 1
pixelptr res 1
pixelpush res 1
cogline res 1
nextlineptr res 1
_enable res 1 'enable
cogcount res 1
taskptr res 1 'tasks
taskret res 1
t1 res 1
t2 res 1
t3 res 1
x res 1 'display
y res 1
hf res 1
hb res 1
vf res 1
vb res 1
hx res 1
vx res 1
tile res 1
pixels res 1
lineadd res 1
interlace res 1
hv res 1
hvbase res 1
h1 res 1
h2 res 1
'
' Parameter buffer
'
{{
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% TERMS OF USE: MIT License %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%$%
%Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation %
%files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, %
%modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software%
%is furnished to do so, subject to the following conditions: %
% %
%The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.%
% %
%THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE %
%WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR %
%COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, %
%ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
}}