diff options
Diffstat (limited to 'home/copy.asm')
| -rw-r--r-- | home/copy.asm | 53 |
1 files changed, 35 insertions, 18 deletions
diff --git a/home/copy.asm b/home/copy.asm index e319cd6b..838bb52d 100644 --- a/home/copy.asm +++ b/home/copy.asm @@ -1,53 +1,70 @@ -CopyBytes:: ; 311a (0:311a) - inc b - inc c - jr .asm_3121 -.asm_311e +CopyBytes:: +; copy bc bytes from hl to de + inc b ; we bail the moment b hits 0, so include the last run + inc c ; same thing; include last byte + jr .HandleLoop +.CopyByte: ld a, [hli] ld [de], a inc de -.asm_3121 +.HandleLoop: dec c - jr nz, .asm_311e + jr nz, .CopyByte dec b - jr nz, .asm_311e + jr nz, .CopyByte ret -GetFarByte:: ; 3128 (0:3128) +GetFarByte:: +; retrieve a single byte from a:hl, and return it in a. + ; bankswitch to new bank ld [wBuffer], a ldh a, [hROMBank] push af ld a, [wBuffer] rst Bankswitch + + ; get byte from new bank ld a, [hl] ld [wBuffer], a + + ; bankswitch to previous bank pop af rst Bankswitch + + ; return retrieved value in a ld a, [wBuffer] ret -GetFarHalfword:: ; 313c (0:313c) +GetFarHalfword:: +; retrieve a halfword from a:hl, and return it in hl. + ; bankswitch to new bank ld [wBuffer], a ldh a, [hROMBank] push af ld a, [wBuffer] rst Bankswitch + + ; get halfword from new bank, put it in hl ld a, [hli] ld h, [hl] ld l, a + + ; bankswitch to previous bank and return pop af rst Bankswitch ret -ByteFill:: ; 314c (0:314c) - inc b - inc c - jr .asm_3151 -.asm_3150 + +ByteFill:: +; fill bc bytes with the value of a, starting at hl + inc b ; we bail the moment b hits 0, so include the last run + inc c ; same thing; include last byte + jr .HandleLoop +.PutByte: ld [hli], a -.asm_3151 +.HandleLoop: dec c - jr nz, .asm_3150 + jr nz, .PutByte dec b - jr nz, .asm_3150 + jr nz, .PutByte ret |