GPU/External Registers: Difference between revisions
| Line 148: | Line 148: | ||
| 0x04 | | 0x04 | ||
| 4 | | 4 | ||
| | | HDispStart(?) | ||
| Values 0xD1-0x1C1 inclusive are valid (except 2DS bottom screen) | | Values 0xD1-0x1C1 inclusive are valid (except 2DS bottom screen) | ||
min. 0xD1, bitmask 0xFFF | min. 0xD1, bitmask 0xFFF | ||
| Line 155: | Line 155: | ||
| 4 | | 4 | ||
| ? | | ? | ||
| | | must be >= REG#0x00 | ||
|- | |- | ||
| 0x0C | | 0x0C | ||
| 4 | | 4 | ||
| ? | | ? | ||
| | | must be >= REG#0x08 | ||
|- | |- | ||
| 0x10 | | 0x10 | ||
| 4 | | 4 | ||
| VAdjustGranule | | VAdjustGranule(?) or VBackPorch(?) | ||
or | or | ||
VAdjust(2DS bottom screen) | |||
or | |||
offset the bottom screen (0 to kill | Seems to offset pixels relative to someting | ||
(last row of pixels blitted increases by this amount; | |||
setting this to lower than 2 will kill the screen timing) | |||
| Finetune vertical pixel offset(blur screen), 0x1C2 max = half pixel | |||
or (2DS) | |||
offset the bottom screen (0 to kill top screen, 0x1C2 max on bottom screen) | |||
|- | |- | ||
| 0x14 | | 0x14 | ||
| Line 183: | Line 190: | ||
| 4 | | 4 | ||
| ??? | | ??? | ||
| | | should be < REG#0x10 | ||
|- | |- | ||
| 0x20 | | 0x20 | ||
| 4 | | 4 | ||
| ? | | HFrontPorch(?) | ||
| ??? the screen gets vertically offset with wrap-around | | ??? the screen gets vertically offset with wrap-around | ||
horizontal timing gets messed up | horizontal timing gets messed up | ||
| Line 198: | Line 205: | ||
| 0x28 | | 0x28 | ||
| 4 | | 4 | ||
| | | VDispStart(?) or VFrontPorch | ||
| | | | ||
|- | |- | ||
| Line 208: | Line 215: | ||
| 0x34 | | 0x34 | ||
| 4 | | 4 | ||
| VDisp | | VDisp(?) | ||
| Total amonut of vertical scanlines displayed | | Total amonut of vertical scanlines displayed (only for top screen it seems like) | ||
|- | |- | ||
| 0x44 | | 0x44 | ||
| Line 223: | Line 230: | ||
| 0x50 | | 0x50 | ||
| 4 | | 4 | ||
| | | Horizontal position counter | ||
| read-only | | read-only | ||
|- | |- | ||
| 0x54 | | 0x54 | ||
| 4 | | 4 | ||
| Horizontal scanline counter | | Horizontal scanline (HBlank) counter | ||
| read-only | | read-only | ||
|- | |- | ||