Update sdspi with write dma

sw/test_code/sd_controller_test/main.s

@@ -196,6 +196,33 @@ _init:
                 lda #18
                 jsr send_dma
 
+                ; dumb sleep to wait for DMA to be done.
+                lda #$3a
+        @sleep2:dec
+                bne @sleep2
+
+                ; Write the first sector into the second sector
+                stz SD_DMA_BASE+$3
+                stz SD_DMA_BASE+$2
+                lda #$10
+                sta SD_DMA_BASE+$1
+                stz SD_DMA_BASE
+
+                stz SD_DMA_LEN + $3
+                stz SD_DMA_LEN + $2
+                stz SD_DMA_LEN + $1
+                lda #$2
+                sta SD_DMA_LEN
+
+                ; address 2
+                stz sreg+1
+                stz sreg
+                ldx #$00
+                lda #$02
+                jsr pusheax
+                lda #25
+                jsr write_dma
+
 
 @end:
                 bra @end
@@ -248,6 +275,12 @@ send_dma:       pha
                 pla
                 bra send
 
+write_dma:      pha
+                lda #$a4
+                sta tmp1
+                pla
+                bra send
+
 send:           pha             ; push command to stack
                 jsr popeax
                 PHA