Re: Problem with BitBLT

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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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>Message</TITLE>

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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>&nbsp;</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)&nbsp;,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>&nbsp;</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>&nbsp;</DIV></BODY></HTML>

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