collapseos/recipes/rc2014/sdcard/sdinit.asm
2019-05-20 11:00:14 -04:00

53 lines
742 B
NASM

.equ JUMP_PRINTSTR 0x03
.equ JUMP_PRINTHEX 0x06
.equ JUMP_SDCINITALIZE 0x09
.equ JUMP_SDCSENDRECV 0x0c
.equ JUMP_SDCWAITRESP 0x0f
.equ JUMP_SDCCMD 0x12
.equ JUMP_SDCCMDR1 0x15
.equ JUMP_SDCCMDR7 0x18
.equ JUMP_SDCREAD 0x1b
.equ JUMP_SDCSETBLKSIZE 0x1e
.org 0x9000
call JUMP_SDCINITALIZE
or a
jp nz, error
ld hl, sOk
call JUMP_PRINTSTR
call JUMP_SDCSETBLKSIZE
or a
jp nz, error
ld hl, sOk
call JUMP_PRINTSTR
; read sector 0
xor a
call JUMP_SDCREAD
or a
jp nz, error
push hl
ld hl, sOk
call JUMP_PRINTSTR
pop hl
; SDC buffer address is in HL
; YOLO! print it!
call JUMP_PRINTSTR
ret
error:
call JUMP_PRINTHEX
ld hl, sErr
call JUMP_PRINTSTR
ret
sOk:
.db "Ok", 0xa, 0xd, 0
sErr:
.db "Err", 0xa, 0xd, 0