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Update sd controller and test code

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This commit is contained in:
Byron Lathi
2024-03-12 18:20:51 -07:00
parent f7580f719f
commit 455814ec14
3 changed files with 110 additions and 4 deletions
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106
sw/test_code/sd_controller_test/main.s
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@@ -8,8 +8,12 @@
SD_CONTROLLER = $e000
SD_ARG = SD_CONTROLLER + $4
SD_RESP = SD_CONTROLLER + $10
CLK_DIV = $20
.zeropage
rca: .res 4
.code
_nmi_int:
@@ -28,5 +32,107 @@ _init:
sta SD_ARG+3
lda #$08
sta SD_CONTROLLER
nop
nop
nop
lda #55
sta SD_CONTROLLER
lda #41
sta SD_CONTROLLER
nop
nop
nop
@acmd41:
lda #55
sta SD_CONTROLLER
lda #$80
sta SD_ARG+1
lda #$ff
sta SD_ARG+2
lda #$40
sta SD_ARG+3
lda #41
sta SD_CONTROLLER
nop
nop
nop
nop
nop
lda SD_RESP+3
bmi card_ready
ldx #$10
@loop: dex
bne @loop
bra @acmd41
card_ready:
lda #2
sta SD_CONTROLLER
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
lda #3
sta SD_CONTROLLER
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
lda SD_RESP
sta rca
lda SD_RESP+1
sta rca+1
lda SD_RESP+2
sta rca+2
lda SD_RESP+3
sta rca+3
lda rca
sta SD_ARG
lda rca+1
sta SD_ARG+1
lda rca+2
sta SD_ARG+2
lda rca+3
sta SD_ARG+3
lda #7
sta SD_CONTROLLER
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
lda #17
sta SD_CONTROLLER
@end: bra @end