initial

.gitignore

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+*.sav
+*.map
+*.o
+
+*.elf
+*.gba

Makefile

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+all: main.gba
+
+CFLAGS += -falign-functions=16
+
+LIB = $(PWD)/gba-lib
+
+include $(LIB)/common.mk
+
+AFLAGS += -I$(LIB)
+CFLAGS += -I$(LIB)
+
+OBJS = $(LIB)/header.o $(LIB)/load.o $(LIB)/copy.o
+OBJS += main.o
+OBJS += DSC09311_256.data.o
+OBJS += DSC09311_256.data.pal.o
+
+HEADERS = $(wildcard *.h)
+
+main.elf: $(OBJS) | $(LIB)/main.lds
+	$(call LINK_ELF,$(LIB)/main.lds)
+
+# external
+
+make-tools:
+	$(MAKE) -C tools
+
+%.glyph: %.otb | make-tools
+	./tools/otb-convert $< > $@
+
+%.glyph.o: %.glyph
+	$(BUILD_BINARY_O)
+
+%.data.o: %.data
+	$(BUILD_BINARY_IMAGE_O)
+
+%.data.pal.o: %.data.pal
+	$(BUILD_BINARY_IMAGE_O)

gba-lib

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+../gba-lib

main.c

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+extern unsigned int _binary_DSC09311_256_data_pal_start;
+extern unsigned int _binary_DSC09311_256_data_pal_end;
+extern unsigned int _binary_DSC09311_256_data_pal_size;
+
+extern unsigned int _binary_DSC09311_256_data_start;
+extern unsigned int _binary_DSC09311_256_data_end;
+extern unsigned int _binary_DSC09311_256_data_size;
+
+#include "io_reg.h"
+#include "vram.h"
+#include "register_values.h"
+#include "copy.h"
+#include "nib.h"
+#include "type.h"
+#include "oam.h"
+
+void _start(void)
+{
+  int height = 240;
+  int width = 160;
+
+  u8 * pal = (u8*)&_binary_DSC09311_256_data_pal_start;
+  u16 * _pram = (u16 *)&pram.bg[0][0];
+  for (int color = 0; color < 256; color++) {
+    int r = pal[color * 3 + 0] >> 3;
+    int g = pal[color * 3 + 1] >> 3;
+    int b = pal[color * 3 + 2] >> 3;
+    _pram[color] = PRAM_RGB15(r, g, b);
+  }
+
+  u32 _vram;
+
+  for (int y = 0; y < height; y++) {
+    for (int x = 0; x < width; x++) {
+      u8 index = ((u8 *)(&_binary_DSC09311_256_data_start))[y * width + x];
+
+      switch (x & 0x3) {
+      case 0: _vram = index; break;
+      case 1: _vram |= index << 8; break;
+      case 2: _vram |= index << 16; break;
+      case 3: _vram |= index << 24;
+        *((u32 *)(0x6000000 + (y * width + x))) = _vram;
+        break;
+      }
+    }
+  }
+
+  while ((io_reg.VCOUNT & 0xff) < 161);
+
+  io_reg.DISPCNT =
+    ( DISPCNT__BG2
+    | DISPCNT__BG_MODE_4
+    | DISPCNT__FRAMEBUFFER(0)
+    );
+
+  while (1) {
+    io_reg.HALTCNT = 0;
+  };
+}

palette.py

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+f = open("DSC09311-256.data.pal", 'rb')
+b = f.read()
+
+
+def grouper(iterable, n):
+    args = [iter(iterable)] * n
+    return zip(*args, strict=True)