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VGA_Text.spin
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VGA_Text.spin
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''***************************************
''* VGA Text 32x15 v1.0 *
''* Author: Chip Gracey *
''* Copyright (c) 2006 Parallax, Inc. *
''* See end of file for terms of use. *
''***************************************
CON
cols = 32
rows = 15
screensize = cols * rows
lastrow = screensize - cols
vga_count = 21
VAR
long col, row, color, flag
word screen[screensize]
long colors[8 * 2]
long vga_status '0/1/2 = off/visible/invisible read-only (21 longs)
long vga_enable '0/non-0 = off/on write-only
long vga_pins '%pppttt = pins write-only
long vga_mode '%tihv = tile,interlace,hpol,vpol write-only
long vga_screen 'pointer to screen (words) write-only
long vga_colors 'pointer to colors (longs) write-only
long vga_ht 'horizontal tiles write-only
long vga_vt 'vertical tiles write-only
long vga_hx 'horizontal tile expansion write-only
long vga_vx 'vertical tile expansion write-only
long vga_ho 'horizontal offset write-only
long vga_vo 'vertical offset write-only
long vga_hd 'horizontal display ticks write-only
long vga_hf 'horizontal front porch ticks write-only
long vga_hs 'horizontal sync ticks write-only
long vga_hb 'horizontal back porch ticks write-only
long vga_vd 'vertical display lines write-only
long vga_vf 'vertical front porch lines write-only
long vga_vs 'vertical sync lines write-only
long vga_vb 'vertical back porch lines write-only
long vga_rate 'tick rate (Hz) write-only
OBJ
vga : "VGA"
PUB start(basepin) : okay
'' Start terminal - starts a cog
'' returns false if no cog available
''
'' requires at least 80MHz system clock
setcolors(@palette)
out(0)
longmove(@vga_status, @vga_params, vga_count)
vga_pins := basepin | %000_111
vga_screen := @screen
vga_colors := @colors
vga_rate := clkfreq >> 2
okay := vga.start(@vga_status)
PUB stop
'' Stop terminal - frees a cog
vga.stop
PUB str(stringptr)
'' Print a zero-terminated string
repeat strsize(stringptr)
out(byte[stringptr++])
PUB dec(value) | i
'' Print a decimal number
if value < 0
-value
out("-")
i := 1_000_000_000
repeat 10
if value => i
out(value / i + "0")
value //= i
result~~
elseif result or i == 1
out("0")
i /= 10
PUB hex(value, digits)
'' Print a hexadecimal number
value <<= (8 - digits) << 2
repeat digits
out(lookupz((value <-= 4) & $F : "0".."9", "A".."F"))
PUB bin(value, digits)
'' Print a binary number
value <<= 32 - digits
repeat digits
out((value <-= 1) & 1 + "0")
PUB out(c) | i, k
'' Output a character
''
'' $00 = clear screen
'' $01 = home
'' $08 = backspace
'' $09 = tab (8 spaces per)
'' $0A = set X position (X follows)
'' $0B = set Y position (Y follows)
'' $0C = set color (color follows)
'' $0D = return
'' others = printable characters
case flag
$00: case c
$00: wordfill(@screen, $220, screensize)
col := row := 0
$01: col := row := 0
$08: if col
col--
$09: repeat
print(" ")
while col & 7
$0A..$0C: flag := c
return
$0D: newline
other: print(c)
$0A: col := c // cols
$0B: row := c // rows
$0C: color := c & 7
flag := 0
PUB setcolors(colorptr) | i, fore, back
'' Override default color palette
'' colorptr must point to a list of up to 8 colors
'' arranged as follows (where r, g, b are 0..3):
''
'' fore back
'' ------------
'' palette byte %%rgb, %%rgb 'color 0
'' byte %%rgb, %%rgb 'color 1
'' byte %%rgb, %%rgb 'color 2
'' ...
repeat i from 0 to 7
fore := byte[colorptr][i << 1] << 2
back := byte[colorptr][i << 1 + 1] << 2
colors[i << 1] := fore << 24 + back << 16 + fore << 8 + back
colors[i << 1 + 1] := fore << 24 + fore << 16 + back << 8 + back
PRI print(c)
screen[row * cols + col] := (color << 1 + c & 1) << 10 + $200 + c & $FE
if ++col == cols
newline
PRI newline | i
col := 0
if ++row == rows
row--
wordmove(@screen, @screen[cols], lastrow) 'scroll lines
wordfill(@screen[lastrow], $220, cols) 'clear new line
DAT
vga_params long 0 'status
long 1 'enable
long 0 'pins
long %1000 'mode
long 0 'videobase
long 0 'colorbase
long cols 'hc
long rows 'vc
long 1 'hx
long 1 'vx
long 0 'ho
long 0 'vo
long 512 'hd
long 10 'hf
long 75 'hs
long 43 'hb
long 480 'vd
long 11 'vf
long 2 'vs
long 31 'vb
long 0 'rate
' fore back
' RGB RGB
palette byte %%333, %%001 '0 white / dark blue
byte %%330, %%110 '1 yellow / brown
byte %%202, %%000 '2 magenta / black
byte %%111, %%333 '3 grey / white
byte %%033, %%011 '4 cyan / dark cyan
byte %%020, %%232 '5 green / gray-green
byte %%100, %%311 '6 red / pink
byte %%033, %%003 '7 cyan / blue
{{
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ 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. │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
}}