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add cx16diskio.vload_raw() to load headerless files into vram

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Irmen de Jong 2022-10-25 21:12:11 +02:00
parent 8f9d1cfa30
commit da8eb464b8
3 changed files with 18 additions and 4 deletions
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20
compiler/res/prog8lib/cx16/cx16diskio.p8
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@ -37,14 +37,19 @@ cx16diskio {
asmsub vload(str name @R0, ubyte device @Y, ubyte bank @A, uword address @R1) -> ubyte @A { asmsub vload(str name @R0, ubyte device @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
; -- like the basic command VLOAD "filename",device,bank,address ; -- like the basic command VLOAD "filename",device,bank,address
; loads a file into Vera's video memory in the given bank:address, returns success in A ; loads a file into Vera's video memory in the given bank:address, returns success in A
; the file has to have the usual 2 byte header (which will be skipped)
%asm {{ %asm {{
; -- load a file into video ram clc
internal_vload:
phx phx
pha pha
tya tya
tax tax
lda #1 bcc +
ldy #0 ldy #%00000010 ; headerless load mode
bne ++
+ ldy #0 ; normal load mode
+ lda #1
jsr c64.SETLFS jsr c64.SETLFS
lda cx16.r0 lda cx16.r0
ldy cx16.r0+1 ldy cx16.r0+1
@ -71,6 +76,15 @@ cx16diskio {
}} }}
} }
asmsub vload_raw(str name @R0, ubyte device @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
; -- like the basic command BVLOAD "filename",device,bank,address
; loads a file into Vera's video memory in the given bank:address, returns success in A
; the file is read fully including the first two bytes.
%asm {{
sec
jmp vload.internal_vload
}}
}
; replacement function that makes use of fast block read capability of the X16 ; replacement function that makes use of fast block read capability of the X16
; use this in place of regular diskio.f_read() ; use this in place of regular diskio.f_read()

1
docs/source/libraries.rst
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@ -365,6 +365,7 @@ cx16diskio (cx16 only)
----------------------- -----------------------
Available for the Cx16 target. Contains extensions to the load and load_raw routines from the regular Available for the Cx16 target. Contains extensions to the load and load_raw routines from the regular
diskio module, to deal with loading of potentially large files in to banked ram (HiRam). diskio module, to deal with loading of potentially large files in to banked ram (HiRam).
Routines to directly load data into video ram are also present (vload and vload_raw).
Also contains a helper function to calculate the file size of a loaded file (although that is truncated Also contains a helper function to calculate the file size of a loaded file (although that is truncated
to 16 bits, 64Kb) to 16 bits, 64Kb)

1
docs/source/todo.rst
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@ -4,7 +4,6 @@ TODO
For next release For next release
^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^
- ir: asmsub contents remains blank in IR file - ir: asmsub contents remains blank in IR file
- add cx16diskio.vload_raw() to load headerless files into vram
- mention the syntax highlighting files in the readme and the docs, and add note to the IDEA one that it can also be used in Rider - mention the syntax highlighting files in the readme and the docs, and add note to the IDEA one that it can also be used in Rider
... ...