* Re: Problem with BitBLT
@ 2003-07-09 19:29 Fredrik Söderqvist
0 siblings, 0 replies; 2+ messages in thread
From: Fredrik Söderqvist @ 2003-07-09 19:29 UTC (permalink / raw)
To: Nitin Mahajan; +Cc: linux-fbdev-devel
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I'm a bit concerned about the tenth bit in the BR04 register. Datasheet (page 325) says:
"10 Source select
0: Configures the BitBLT engine to read the source data from the frame buffer ...
1: Configures the BitBLT engine to accept the source data from the host CPU via the BitBLT data port ..."
So if we want copy VRAM->VRAM bit 10 should be 0 - no?
Regarding BR04 (bits 0-7):
Since 0xFF is the "write all 1:s" and you see a small block, I believe you are correct when you think the problem is with the transfer from System RAM -> VRAM. The 0xCC should though be what we need... (source copy).
Maybe you could try moving the source data to a different offset than 0? If there are any issues with overlapping...
Filling the entire VRAM with a pattern could perhaps also help in find the problem.
Regards,
F. Söderquist
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HI!
Iam trying to program the Bit BLT engine of 69030 with the attached code, but nothing is visible on the screen.
When I select the bitwise operation as 0xFF(write to BR04) ,the white block is coming at desired location and of desired size.
But whwn I choose it as 0xCC nothing comes on screen...
Can any one please help me out of this......
THANKING U IN ADAVANCE
regards,
Nitin Mahajan
mail:nitin@soc-soft.com
Ph:51101667. Mobile : 9886099925
======================================
The Lord gave us two ends -- one to sit on and the other to think with. Success depends on which one we use the most.
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<BODY>
<DIV><FONT face=Arial size=2><SPAN
class=863152217-09072003>HI!</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=863152217-09072003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=863152217-09072003>Iam trying to
program the Bit BLT engine of 69030 with the attached code, but nothing is
visible on the screen.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=863152217-09072003>When I select the
bitwise operation as 0xFF(write to BR04) ,the white block is coming at
desired location and of desired size.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=863152217-09072003>But whwn I choose it
as 0xCC nothing comes on screen...</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=863152217-09072003>Can any one please
help me out of this......</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=863152217-09072003>THANKING U IN
ADAVANCE</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=863152217-09072003>regards,</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV align=left><FONT face=Verdana size=2>Nitin Mahajan</FONT></DIV>
<DIV align=left><FONT face=Verdana size=2>
<DIV align=left><FONT face=Verdana
size=2>mail:nitin@soc-soft.com</FONT></DIV></FONT></DIV>
<DIV align=left><FONT face=Verdana size=2>Ph:51101667. Mobile :
9886099925</FONT></DIV>
<DIV align=left><FONT face=Verdana
size=2>======================================</FONT></DIV>
<DIV align=left><FONT face=Verdana size=2>The Lord gave us two ends -- one to
sit on and the other to think with. Success depends on which one we use the
most.</FONT></DIV>
<DIV> </DIV></BODY></HTML>
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^ permalink raw reply [flat|nested] 2+ messages in thread* Problem with BitBLT
@ 2003-07-09 17:26 Nitin Mahajan
0 siblings, 0 replies; 2+ messages in thread
From: Nitin Mahajan @ 2003-07-09 17:26 UTC (permalink / raw)
To: linux-fbdev-devel; +Cc: Fredrik Söderqvist
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HI!
Iam trying to program the Bit BLT engine of 69030 with the attached code, but nothing is visible on the screen.
When I select the bitwise operation as 0xFF(write to BR04) ,the white block is coming at desired location and of desired size.
But whwn I choose it as 0xCC nothing comes on screen...
Can any one please help me out of this......
THANKING U IN ADAVANCE
regards,
Nitin Mahajan
mail:nitin@soc-soft.com
Ph:51101667. Mobile : 9886099925
======================================
The Lord gave us two ends -- one to sit on and the other to think with. Success depends on which one we use the most.
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void chips_imageblit(struct fb_image *image)
{
UINT32 dst_span,src_span;
/* Wait till blitter is not busy */
while (BR04 & (1 << 31))
;
/* BitBlt Control Register */
BR04 = ((bytes_per_pixel - 1) & 0x3) << 24 |
1 << 23 | 1 << 10 |
CCh;
/*MOdify bit 10 of this register*/
/* Src & Dst Span */
src_span = (image->width * bytes_per_pixel) & 0x1FFF;
dst_span = (xres * bytes_per_pixel) & 0x1FFF;
BR00 = dst_span << 16 | src_span;
/* Source Address */
BR06 = 0x00;
/* Destination Address */
BR07 = 0x0; /* ((pos_y * xres + pos_x) * bytes_per_pixel) & 0x3FFFFF */
memcpy(BLIT_BASE, image->data, image->height * image->width * bytes_per_pixel);
/* Destination width and height */
BR08 = (image->height & 0x1FFF) << 16 | src_span;
/* Blit should now be in action */
}
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