1.1 KiB
1.1 KiB
copper bars
Now I discover how vertical copper waiting works.
Some notes:
- The first line is copper address $2c
- The last last is copper address $2c + 256 (screen height) = $12c
At copper line 255 ($FF), we run out of bits in the copper wait instruction, so if we want to wait for lines after this, we need to wait for a wrapped value. See hardware reference manual details here
copper_gen.c will generate a full screen copper list with horizontal bars. See http://krazydad.com/tutorials/makecolors.php for details on the algorithm used to generate the bars. You can generate different patterns by changing the algorithm parameters.
Also in this example I have remove interrupt processing and disabled most of the interrupts.
screenshot
