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memory.asm
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memory.asm
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;*
;* Memory Manipulation Code
;*
;* Started 16-Aug-97
;*
;* Initials: JF = Jeff Frohwein, CS = Carsten Sorensen
;*
;* V1.0 - 16-Aug-97 : Original Release - JF, most code from CS
;* V1.1 - 29-Nov-97 : Added monochrome font copy. - JF
;* Fixed bug in mem_SetVRAM. - JF
;*
;* Library Subroutines:
;*
;* lcd_WaitVRAM -
;* Macro that pauses until VRAM available.
;*
;* mem_Set -
;* Set a memory region.
;* Entry: a = value, hl = start address, bc = length
;*
;* mem_Copy -
;* Copy a memory region.
;* Entry: hl = start address, de = end address, bc = length
;*
;* mem_SetVRAM -
;* Set a memory region in VRAM.
;* Entry: a = value, hl = start address, bc = length
;*
;* mem_CopyVRAM -
;* Copy a memory region to or from VRAM.
;* Entry: hl = start address, de = end address, bc = length
;*
;If all of these are already defined, don't do it again.
IF !DEF(MEMORY_ASM)
MEMORY_ASM SET 1
rev_Check_memory_asm: MACRO
;NOTE: REVISION NUMBER CHANGES MUST BE ADDED
;TO SECOND PARAMETER IN FOLLOWING LINE.
IF \1 > 1.1 ; <---- NOTE!!! PUT FILE REVISION NUMBER HERE
WARN "Version \1 or later of 'memory.asm' is required."
ENDC
ENDM
INCLUDE "gbhw.inc"
; Make sure include files are useable revisions.
rev_Check_hardware_inc 1.5
; Macro that pauses until VRAM available.
lcd_WaitVRAM: MACRO
ldh a,[rSTAT] ; <---+
and STATF_BUSY ; |
jr nz,@-4 ; ----+
ENDM
SECTION "Memory1 Code", ROM0
;***************************************************************************
;*
;* mem_Set - "Set" a memory region
;*
;* input:
;* a - value
;* hl - pMem
;* bc - bytecount
;*
;***************************************************************************
mem_Set::
inc b
inc c
jr .skip
.loop ld [hl+],a
.skip dec c
jr nz,.loop
dec b
jr nz,.loop
ret
;***************************************************************************
;*
;* mem_Copy - "Copy" a memory region
;*
;* input:
;* hl - pSource
;* de - pDest
;* bc - bytecount
;*
;***************************************************************************
mem_Copy::
inc b
inc c
jr .skip
.loop ld a,[hl+]
ld [de],a
inc de
.skip dec c
jr nz,.loop
dec b
jr nz,.loop
ret
;***************************************************************************
;*
;* mem_Copy - "Copy" a monochrome font from ROM to RAM
;*
;* input:
;* hl - pSource
;* de - pDest
;* bc - bytecount of Source
;*
;***************************************************************************
mem_CopyMono::
inc b
inc c
jr .skip
.loop ld a,[hl+]
ld [de],a
inc de
ld [de],a
inc de
.skip dec c
jr nz,.loop
dec b
jr nz,.loop
ret
;***************************************************************************
;*
;* mem_SetVRAM - "Set" a memory region in VRAM
;*
;* input:
;* a - value
;* hl - pMem
;* bc - bytecount
;*
;***************************************************************************
mem_SetVRAM::
inc b
inc c
jr .skip
.loop push af
di
lcd_WaitVRAM
pop af
ld [hl+],a
ei
.skip dec c
jr nz,.loop
dec b
jr nz,.loop
ret
;***************************************************************************
;*
;* mem_CopyVRAM - "Copy" a memory region to or from VRAM
;*
;* input:
;* hl - pSource
;* de - pDest
;* bc - bytecount
;*
;***************************************************************************
mem_CopyVRAM::
inc b
inc c
jr .skip
.loop di
lcd_WaitVRAM
ld a,[hl+]
ld [de],a
ei
inc de
.skip dec c
jr nz,.loop
dec b
jr nz,.loop
ret
ENDC ;MEMORY_ASM