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readres3 assembly rewrite

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This commit is contained in:
Byron Lathi
2023-07-23 18:25:29 -07:00
parent 028a431189
commit 1c693b029d
2 changed files with 31 additions and 0 deletions
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2
sw/bootloader/devices/sd_card.c
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@@ -172,6 +172,7 @@ void SD_readRes2(uint8_t *res)
/******************************************************************************* /*******************************************************************************
Read R3 from SD card Read R3 from SD card
*******************************************************************************/ *******************************************************************************/
/*
void SD_readRes3(uint8_t *res) void SD_readRes3(uint8_t *res)
{ {
// read response 1 in R3 // read response 1 in R3
@@ -183,6 +184,7 @@ void SD_readRes3(uint8_t *res)
// read remaining bytes // read remaining bytes
SD_readBytes(res + 1, R3_BYTES); SD_readBytes(res + 1, R3_BYTES);
} }
*/
/******************************************************************************* /*******************************************************************************
Read R7 from SD card Read R7 from SD card

29
sw/bootloader/devices/sd_card_asm.s
View File

@@ -1,12 +1,15 @@
.export _SD_command .export _SD_command
.export _SD_readRes1 .export _SD_readRes1
.export _SD_readRes2 .export _SD_readRes2
.export _SD_readRes3
.export _SD_readBytes .export _SD_readBytes
.importzp sp, ptr1 .importzp sp, ptr1
.autoimport on .autoimport on
.MACPACK generic
; void SD_command(uint8_t cmd, uint32_t arg, uint8_t crc) ; void SD_command(uint8_t cmd, uint32_t arg, uint8_t crc)
; The plan: push crc to stack, load arg into tmp1 through 4 ; The plan: push crc to stack, load arg into tmp1 through 4
@@ -91,4 +94,30 @@ read:
bne read ; and if x is zero we are done bne read ; and if x is zero we are done
rts rts
.endproc
; void SD_readRes3(uint8_t *res)
.proc _SD_readRes3: near
sta ptr1 ; store res in ptr1
stx ptr1 + 1
jsr _SD_readRes1 ; read respopnse 1 in R3
cmp #$02 ; if error reading R1, return
bge @L1
inc ptr1 ; read remaining bytes
bne @L2
inc ptr1
@L2: lda ptr1 ; push low byte
sta (sp)
ldy #$01
lda ptr1 + 1 ; push high byte
sta (sp),y
lda #$04 ; R3_BYTES
jsr _SD_readBytes
@L1: rts
.endproc .endproc