A question about mixing spin and C [solved]
Reinhard
Posts: 489
Hello, I am currently working on graphics on the P2 (as can easily be seen in the imperfect picture).
Is there a possibility to mix with fastspin C-sources and spin-sources to a binary. I have in mind to use the NTSC examples of Chip as a video driver and to create the image content with C, i.e. to fill the bitmap buffer area.
Thank's
Reinhard
Is there a possibility to mix with fastspin C-sources and spin-sources to a binary. I have in mind to use the NTSC examples of Chip as a video driver and to create the image content with C, i.e. to fill the bitmap buffer area.
Thank's
Reinhard
Comments
struct __using("NTSC_video.spin2") ntsc;and then access methods and variables with the usual C/C++ syntax, e.g.:Reinhard
I have this spin object in file NTSC_Frame.spin2
'********************************* '* NTSC 256 x 192 x 8bpp rgbi8 * '********************************* CON f_color = 3_579_545.0 'colorburst frequency f_scanline = f_color / 227.5 'scanline frequency f_pixel = f_scanline * 400.0 'pixel frequency for 400 pixels per scanline f_clock = 250_000_000.0 'clock frequency f_xfr = f_pixel / f_clock * float($7FFF_FFFF) f_csc = f_color / f_clock * float($7FFF_FFFF) * 2.0 s = 84 'scale DAC output (s = 0..128) r = s * 1000 / 1646 'precompensate for modulator expansion of 1.646 mody = ((+38*s/128) & $FF) << 24 + ((+75*s/128) & $FF) << 16 + ((+15*s/128) & $FF) << 8 + (110*s/128 & $FF) modi = ((+76*r/128) & $FF) << 24 + ((-35*r/128) & $FF) << 16 + ((-41*r/128) & $FF) << 8 + (100*s/128 & $FF) modq = ((+27*r/128) & $FF) << 24 + ((-67*r/128) & $FF) << 16 + ((+40*r/128) & $FF) << 8 + 128 video_pin = 1 ntsc_map = $1000 DAT org ' Setup start 'hubset ##%1_000001_0000011000_1111_10_00 'config PLL, 20MHz/2*25*1 = 250MHz 'waitx ##20_000_000 / 200 'allow crystal+PLL 5ms to stabilize 'hubset ##%1_000001_0000011000_1111_10_11 'switch to PLL rdfast ##256*192/64,##ntsc_map 'set rdfast to wrap on bitmap setxfrq ##round(f_xfr) 'set transfer frequency setcfrq ##round(f_csc) 'set colorspace converter frequency setcy ##mody 'set colorspace converter coefficients setci ##modi setcq ##modq setcmod #%11_1_0000 'set colorspace converter to YIQ mode (composite) cogid .x 'enable dac mode in pin setnib .dacmode,.x,#2 wrpin .dacmode,#video_pin drvl #video_pin ' Field loop .field mov .x,#35 'top blanks call #.blank drvnot #30 mov .x,#192 'set visible lines .line call #.hsync 'do horizontal sync xcont .m_rf,#0 'visible line xcont .m_av,#1 'after visible spacer djnz .x,#.line 'another line? mov .x,#27 'bottom blanks call #.blank mov .x,#6 'high vertical syncs .vlow xcont .m_hl,#2 xcont .m_hh,#1 djnz .x,#.vlow mov .x,#6 'low vertical syncs .vhigh xcont .m_ll,#2 xcont .m_lh,#1 djnz .x,#.vhigh mov .x,#6 'high vertical syncs .vlow2 xcont .m_hl,#2 xcont .m_hh,#1 djnz .x,#.vlow2 jmp #.field 'loop ' Subroutines .blank call #.hsync 'blank lines xcont .m_vi,#0 xcont .m_av,#1 _ret_ djnz .x,#.blank .hsync xcont .m_sn,#2 'horizontal sync xcont .m_bc,#1 xcont .m_cb,.c_cb _ret_ xcont .m_ac,#1 ' Data .dacmode long %0000_0000_000_1011100000000_01_00000_0 .m_sn long $7F010000+29 'sync .m_bc long $7F010000+7 'before colorburst .m_cb long $7F010000+18 'colorburst .m_ac long $7F010000+40 'after colorburst .m_vi long $7F010000+256 'visible .m_av long $7F010000+50 'after visible (400 total) .m_rf long $BF030000+256 'visible rfbyte 8bpp rgbi8 .m_hl long $7F010000+15 'vertical sync high low .m_hh long $7F010000+185 'vertical sync high high (200 total) .m_ll long $7F010000+171 'vertical sync low low .m_lh long $7F010000+29 'vertical sync low high (200 total) .c_cb long $507000_01 'colorburst reference color .x res 1 .y res 1And the C - code is
global
struct __using("NTSC_Frame.spin2") ntsc; //LINE 13and in main
cogid = ntsc.start(); printf("%d\n",cogid);give error
I am far away from spin programming.
I need a spin method foo, PUB foo, which in turn calls me the asm routine bar. Is that correct?
Thanks for patience
Reinhard
But I have not looked closely at this object, and I have no idea if this will work correctly. You'll also have to figure out where in memory the frame buffer is in order for the C code to write into that.
Yes, the frame buffer is located at 0x1000, and C code can write into with following steps:
1. Fill an localbuffer with data 2. if the (local) buffer is ready unsigned char * dest; dest = (unsigned char *) 0x1000; memcpy(dest,&buffer[0],256*192);I tested this by first loading the program that writes the video buffer and then loading the NTSC_Frame.spin2 to see something on the monitor.I make the change in NTSC_Frame.spin2 at the end of file: I can compile the spin2 file and it runs standalone, a composite video signal is generated and on monitor I can see random noise, the random content of bitmap buffer.
but with call from C:
struct __using("NTSC_Frame.spin2") ntsc; //LINE13 ntsc.startNtsc(); //LINE44I get error:In fastspin 4.2.0 or later the symbol case sensitivity is kept along with the symbol, so this isn't a problem. So your best bet is probably to upgrade to the newer fastspin, but changing to all lower case will work too (and will continue to work in 4.2.0).