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71 lines
1.3 KiB
NASM
71 lines
1.3 KiB
NASM
#include "jumptable.inc"
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.org 0x9000
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call JUMP_SDCINITALIZE
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or a
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jp nz, .error
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; Alright, normally we should configure block size and all, but this is
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; too exciting and we'll play it dirty: we'll read just enough bytes
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; to fetch our "Hello World!" and print it and we'll leave the SD card
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; hanging. Yeah, I know, not very polite.
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out (5), a
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ld hl, sCmd
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call JUMP_PRINTSTR
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ld a, 0b01010001 ; CMD17
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ld hl, 0 ; read single block at addr 0
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ld de, 0
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call JUMP_SDCCMD
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cp 0
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jr nz, .error
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ld hl, sCmd
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call JUMP_PRINTSTR
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; Command sent, no error, now let's wait for our data response.
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ld b, 20
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.loop1:
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call JUMP_SDCWAITRESP
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; 0xfe is the expected data token for CMD17
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cp 0xfe
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jr z, .loop1end
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cp 0xff
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jr nz, .error
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djnz .loop1
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jr .error
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.loop1end:
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ld hl, sGettingData
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call JUMP_PRINTSTR
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; Data packets follow immediately
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ld b, 12 ; size of "Hello World!"
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ld hl, sDest ; sDest has null chars, we'll be alright
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; printing it.
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.loop2:
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call JUMP_SDCWAITRESP
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ld (hl), a
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inc hl
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djnz .loop2
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out (6), a
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ld hl, sDest
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call JUMP_PRINTSTR
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ret
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.error:
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call JUMP_PRINTHEX
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ld hl, sErr
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call JUMP_PRINTSTR
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ret
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sCmd:
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.db "CMD", 0xa, 0xd, 0
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sGettingData:
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.db "Data", 0xa, 0xd, 0
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sOk:
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.db "Ok", 0xa, 0xd, 0
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sErr:
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.db "Err", 0xa, 0xd, 0
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sDest:
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.fill 0x10
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