Rewrite readRes1, consolidate res1 commands

2023-07-23 17:26:40 -07:00
parent 709c60cf36
commit 60072603d9
2 changed files with 36 additions and 24 deletions
--- a/sw/bootloader/devices/sd_card_asm.s
+++ b/sw/bootloader/devices/sd_card_asm.s
@@ -1,4 +1,5 @@
 .export _SD_command
+.export _SD_readRes1

 .importzp sp

@@ -30,3 +31,24 @@ arg_loop:                       ; send ARG
        rts

 .endproc
+
+; uint8_t SD_readRes1 (void)
+
+.proc   _SD_readRes1:   near
+; Try to read/write up to 8 times, then return value
+
+        ldx     #$08
+
+tryread:        
+        lda     #$ff
+        jsr     _spi_exchange
+        cmp     #$ff
+        bne     end
+        dex
+        bne     tryread
+
+end:
+        rts
+
+
+.endproc