Instructor Notes

April 2, 2008

Assignments

• Project Proposals
• Phase I discussion

Review

• lookup tables with sound revisited
  • convert from Hz to GB values at assemble time
• main loop with timer
  • CALL_IF_NTH_TIME macro

Transferer II questions

What to cover next week

How do we "pool our recourses?"

• break into small groups?
• program at the lab?
• identify more common problems?
• go over people's code, either broken or working?

windows

• 32 x 32 8x8 tiles
• choose coordinates on the screen with WX and WY
  • WX offset by 7 i.e. WX = 7 WY = 0 is actually (0,0)
• turn the window off and on with LCDC and LCDCF_WINON and LCDCF_WINOFF
• choose Window Tile Map also with LCDC.
  • Use $9c00 for Window Tile Map if you use $9800 for Background Tile Map....or...vice versa
• no tiles in a window are transparent
• window is always above background
• sprite is either above both background and window, or below both background and window.

LCDC interrupt

• use to turn window on and off at certain vertical lines
• set flags in STAT so the LCDC interrupt is generated when LYC = LCDC LY
• in your LCDC interrupt routine, turn the window off or on, etc.