Sprites??? Not working tho'

homebrew-tutorial/charset.asm

@@ -54,6 +54,148 @@ charset:
     .byte %00000000
     .byte %11111111
 
+    ; This is tile 0x02 in 2bpp mode (what the background uses), but tile
+    ; 0x01 in 4bpp mode (what the sprites use). It's very strange to mix
+    ; these, but my assumption is that by this point you've already got
+    ; your own graphics pipeline of some sort and probably aren't using
+    ; 2bpp graphics at all any more, so I'm sure you can figure out what'll
+    ; work best for you on your own :)
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
 
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+
+    ; normally you would put 14 other 8x8 tiles here, but we don't have
+    ; any, so just fill it with zeros.
+    .repeat 14 * 32
+        .byte 0
+    .endrepeat
+
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11100000
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %00000111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %11111111
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
+        .byte   %00000000
 
 charset_end:

homebrew-tutorial/main.asm

@@ -11,6 +11,12 @@
 
 nmi_count:  .res 2
 
+.segment "BSS"
+
+oam_lo_buffer:  .res 512
+oam_hi_buffer:  .res 32
+oam_buffer_end:
+
 .segment "CODE"
 
 VRAM_CHARS = $0000
@@ -46,6 +52,16 @@ start:
     lda #$7c
     sta CGDATA
 
+    ; Set up sprite palette
+    lda #128 ;sprite palettes begin at cgdata index 128
+    sta CGADD
+    stz CGDATA
+    stz CGDATA
+
+    lda #$1f
+    sta CGDATA
+    stz CGDATA
+
     ; Graphics mode 0, 8x8 tiles
     stz BGMODE
 
@@ -115,13 +131,23 @@ start:
     sta VMDATAL
     stz VMDATAH
 
-    ; Show bg1
+    ; Show bg1 + sprites
-    lda #%00000001
+    lda #%00010001
     sta TM
 
     lda #$0f
     sta INIDISP
 
+    lda #$0
+    sta OBSEL
+
+    ldx #0
+@zero_oam:
+    stz oam_lo_buffer, x
+    inx
+    cpx #(oam_buffer_end - oam_lo_buffer)
+    bne @zero_oam
+
     lda #%10000001
     sta NMITIMEN
 
@@ -133,6 +159,35 @@ mainloop:
         cmp nmi_count
         beq nmi_check
 
+    ; set sprite 0 X position
+    ldx #$42
+    stx oam_lo_buffer
+
+    ; set sprite 0 Y position
+    ldx #$69
+    stx oam_lo_buffer + 1
+    ; Set sprite 0 to priority 3 and tile 0x01
+    ldx #((%00110000 << 8) | $0001)
+    stx oam_lo_buffer + 2
+
+    ; Set sprite 0 to be large (16x16)
+    lda #%00000010
+    sta oam_hi_buffer
+
+    ; Copy OAM data via DMA
+    stz OAMADDL
+    lda #$0
+    sta DMAP1
+    lda #<OAMDATA
+    sta BBAD1
+    ldx #.loword(oam_lo_buffer)
+    stx A1B1
+    ldx #(oam_buffer_end - oam_lo_buffer)
+    stx DAS1L
+    lda #%00000010
+    sta MDMAEN
+
+
 
     lda JOY1L
     bit #JOYL_L