2019-05-08 05:26:52 +10:00
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#include "jumptable.inc"
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.org 0x9000
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call JUMP_SDCWAKEUP
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2019-05-08 06:20:28 +10:00
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; We expect a 0x01 R1 response
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ld hl, sCmd0
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call JUMP_PRINTSTR
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2019-05-08 05:26:52 +10:00
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ld a, 0b01000000 ; CMD0
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ld hl, 0
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ld de, 0
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ld c, 0x95
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call JUMP_SDCCMDR1
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2019-05-08 06:20:28 +10:00
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cp 0x01
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jr nz, .error
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ld hl, sOk
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call JUMP_PRINTSTR
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; We expect a 0x01 R1 response followed by 0x0001aa R7 response
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ld hl, sCmd8
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call JUMP_PRINTSTR
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2019-05-08 05:26:52 +10:00
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ld a, 0b01001000 ; CMD8
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ld hl, 0
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ld de, 0x01aa
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ld c, 0x87
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call JUMP_SDCCMDR7
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2019-05-08 06:20:28 +10:00
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ld a, h
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cp 0
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jr nz, .error
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ld a, l
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cp 0
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jr nz, .error
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ld a, d
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cp 0x01
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jr nz, .error
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ld a, e
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cp 0xaa
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jr nz, .error
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ld hl, sOk
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call JUMP_PRINTSTR
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2019-05-08 06:38:08 +10:00
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; Now we need to repeatedly run CMD55+CMD41 (0x40000000) until we
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; the card goes out of idle mode, that is, when it stops sending us
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; 0x01 response and send us 0x00 instead. Any other response means that
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; initialization failed.
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ld hl, sCmd41
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call JUMP_PRINTSTR
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.loop:
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ld a, 0b01110111 ; CMD55
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ld hl, 0
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ld de, 0
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call JUMP_SDCCMDR1
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cp 0x01
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jr nz, .error
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ld a, 0b01101001 ; CMD41 (0x40000000)
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ld hl, 0x4000
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ld de, 0x0000
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call JUMP_SDCCMDR1
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cp 0x01
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jr z, .loop
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cp 0
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jr nz, .error
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; Success! out of idle mode!
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ld hl, sOk
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call JUMP_PRINTSTR
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2019-05-08 06:20:28 +10:00
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ret
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.error:
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ld hl, sErr
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call JUMP_PRINTSTR
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2019-05-08 05:26:52 +10:00
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ret
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2019-05-08 06:20:28 +10:00
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sCmd0:
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.db "Sending CMD0", 0xa, 0xd, 0
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sCmd8:
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.db "Sending CMD8", 0xa, 0xd, 0
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2019-05-08 06:38:08 +10:00
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sCmd41:
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.db "Sending CMD41", 0xa, 0xd, 0
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2019-05-08 06:20:28 +10:00
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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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