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92a04f4627
Needed if we want to compile the kernel and zasm from within a SD card. I didn't go straight for 32-bit because it was significantly more complex and 24-bit give us 16M. Enough to go on for a while...
73 lines
1.2 KiB
NASM
73 lines
1.2 KiB
NASM
sdctMain:
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ld hl, .sWriting
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call printstr
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ld hl, 0
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ld de, SDCT_RAMSTART
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.wLoop:
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ld a, (de)
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; To avoid overwriting important data and to test the 24-bit addressing,
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; we set DE to 12 instead of zero
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push de ; <|
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ld de, 12 ; |
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call sdcPutC ; |
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pop de ; <|
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jr nz, .error
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inc hl
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inc de
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; Stop looping if DE == 0
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xor a
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cp e
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jr nz, .wLoop
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; print some kind of progress
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call printHexPair
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cp d
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jr nz, .wLoop
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; Finished writing
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ld hl, .sReading
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call printstr
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ld hl, 0
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ld de, SDCT_RAMSTART
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.rLoop:
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push de ; <|
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ld de, 12 ; |
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call sdcGetC ; |
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pop de ; <|
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jr nz, .error
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ex de, hl
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cp (hl)
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ex de, hl
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jr nz, .notMatching
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inc hl
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inc de
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; Stop looping if DE == 0
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xor a
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cp d
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jr nz, .rLoop
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cp e
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jr nz, .rLoop
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; Finished checking
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xor a
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ld hl, .sOk
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jp printstr ; returns
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.notMatching:
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; error position is in HL, let's preserve it
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ex de, hl
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ld hl, .sNotMatching
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call printstr
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ex de, hl
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jp printHexPair ; returns
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.error:
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ld hl, .sErr
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jp printstr ; returns
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.sWriting:
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.db "Writing", 0xd, 0xa, 0
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.sReading:
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.db "Reading", 0xd, 0xa, 0
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.sNotMatching:
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.db "Not matching at pos ", 0xd, 0xa, 0
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.sErr:
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.db "Error", 0xd, 0xa, 0
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.sOk:
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.db "OK", 0xd, 0xa, 0
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