ÿþ''******************************************** ''* VGA 128x96 64-Color Bitmap Driver v1.0 * ''* Author: Andy Schenk * ''* See end of file for terms of use. * ''******************************************** ''* based on Chip Gracey's 512x384 Bitmap driver '' '' This object generates a 128x96 pixel bitmap, signaled as 1024x768 VGA. '' Each pixel is one byte, so the entire bitmap requires 12 kbytes, '' Pixel memory is arranged left-to-right then top-to-bottom. '' '' A sync indicator signals each time the screen is drawn (you may ignore). '' '' You must provide buffers for the pixels, and sync. Once started, '' all interfacing is done via memory. To this object, all buffers are read- '' only, with the exception of the sync indicator which gets written with a '' non-0 value. You may freely write all buffers to affect screen appearance. '' CON ' 128x96 settings - signals as 1024 x 768 @ 59Hz hp = 128 'horizontal pixels vp = 96 'vertical pixels hf = 8 'horizontal front porch pixels hs = 48 'horizontal sync pixels hb = 80 'horizontal back porch pixels vf = 1 'vertical front porch lines vs = 3 'vertical sync lines vb = 28 'vertical back porch lines hn = 1 'horizontal normal sync state (0|1) vn = 1 'vertical normal sync state (0|1) pr = 55 'pixel rate in MHz at 80MHz system clock (5MHz granularity) ' Tiles xtiles = hp / 4 ' H/V inactive states hv_inactive = (hn << 1 + vn) * $01010101 VAR long cog PUB start(BasePin, PixelPtr, SyncPtr) : okay '' Start VGA driver - starts a COG '' returns false if no COG available '' '' BasePin = VGA starting pin (0, 8, 16, 24, etc.) '' '' PixelPtr = Pointer to 12288 bytess containing colors that make up the '' 192 x 96 pixel bitmap. Only the upper 6 bits of a byte are '' used to set one of 64 colors. '' color byte examples: %%0020 = blue, %%3300 = gold '' '' SyncPtr = Pointer to long which gets written with non-0 upon each screen '' refresh. May be used to time writes/scrolls, so that chopiness '' can be avoided. You must clear it each time if you want to see '' it re-trigger. 'if driver is already running, stop it stop 'implant pin settings and pointers, then launch COG reg_vcfg := $300000FF + (BasePin & %111000) << 6 reg_dira := $FF << (BasePin & %011000) pixel_base := PixelPtr if (cog := cognew(@init, SyncPtr) + 1) return true PUB stop | i '' Stop VGA driver - frees a COG if cog cogstop(cog~ - 1) DAT '*********************************************** '* Assembly language VGA 2-color bitmap driver * '*********************************************** org 'set origin to $000 for start of program ' Initialization code - init I/O init mov dira,reg_dira 'set pin directions mov dirb,reg_dirb movi ctra,#%00001_101 'enable PLL in ctra (VCO runs at 4x) movi frqa,#(pr / 5) << 3 'set pixel rate mov vcfg,reg_vcfg 'set video configuration ' Main loop, display field and do invisible sync lines field mov pixel_ptr,pixel_base 'reset pixel pointer mov y,#vp 'set y lines :yline mov yx,#8 'set y expansion :yexpand mov x,#xtiles 'set x tiles mov vscl,vscl_pixel 'set pixel vscl :xtile rdlong color,pixel_ptr 'get color word and color,colormask 'clear h/v bits or color,hv 'set h/v inactive states waitvid color,#%%3210 'pass colors and pixels to video add pixel_ptr,#4 'point to next pixel long djnz x,#:xtile 'another x tile? sub pixel_ptr,#xtiles * 4 'repoint to first pixels in same line mov x,#1 'do horizontal sync call #hsync djnz yx,#:yexpand 'y expand? add pixel_ptr,#xtiles * 4 'point to first pixels in next line djnz y,#:yline 'another y line? wrlong colormask,par 'visible done, write non-0 to sync mov x,#vf 'do vertical front porch lines call #blank mov x,#vs 'do vertical sync lines call #vsync mov x,#vb 'do vertical back porch lines call #vsync jmp #field 'field done, loop ' Subroutine - do blank lines vsync xor hvsync,#$101 'flip vertical sync bits blank mov vscl,hvis 'do blank pixels waitvid hvsync,#0 hsync mov vscl,#hf 'do horizontal front porch pixels waitvid hvsync,#0 mov vscl,#hs 'do horizontal sync pixels waitvid hvsync,#1 mov vscl,#hb 'do horizontal back porch pixels waitvid hvsync,#0 djnz x,#blank 'another line? hsync_ret blank_ret vsync_ret ret ' Data reg_dira long 0 'set at runtime reg_dirb long 0 'set at runtime reg_vcfg long 0 'set at runtime pixel_base long 0 'set at runtime vscl_pixel long 8 << 12 + 32 '8 clocks per pixel and 4 pixels per set colormask long $FCFCFCFC 'mask to isolate R,G,B bits from H,V hvis long hp*8 'visible pixels per scan line hv long hv_inactive '-H,-V states hvsync long hv_inactive ^ $200 '+/-H,-V states ' Uninitialized data color_ptr res 1 pixel_ptr res 1 color res 1 pixel res 1 x res 1 y res 1 yl res 1 yx res 1 {{ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % TERMS OF USE: MIT License % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%$% %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. % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% }}