Initial commit

.gitignore

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+_build
+*.gb
+*.map
+*.sym
+

.gitmodules

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+[submodule "gbsdk"]
+	path = gbsdk
+	url = git@github.com:daid/gbsdk.git

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

Makefile

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+# Name of your project, will set the name of your ROM.
+PROJECT_NAME := Template
+# Run "rgbfix --mbc-type help" for possible MBC types
+MBC     := ROM
+# Target should be a combination of DMG, CGB and SGB
+TARGETS := DMG
+
+include gbsdk/rules.mk

gbsdk

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+Subproject commit ac612c4c1a416d7b5cc42859e3dcc37f0d23dc77

src/main.c

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+#include "sdk/hardware.h"
+#include "sdk/video.h"
+#include "sdk/oam.h"
+#include "sdk/assets.h"
+#include "sdk/joypad.h"
+#include <string.h>
+
+ASSET(tiles, "tiles.2bpp");
+
+uint8_t cursor_x = 0;
+uint8_t cursor_y = 0;
+
+
+void main() {
+    //Load our initial vram (this is slow, but always works, even outside of vblank)
+    vram_memcpy(0x8000, tiles, tiles_end - tiles);
+    vram_memcpy(0x9000, tiles, tiles_end - tiles);
+    //Setup the OAM for sprite drawing
+    oam_init();
+
+    //Set some default DMG palette data
+    rBGP = 0b11100100;
+    rOBP0 = 0b11100100;
+    rOBP1 = 0b11100100;
+
+    //Put some sprites on the screen
+    shadow_oam[0].y = 0x20;
+    shadow_oam[0].x = 0x20;
+    shadow_oam[0].tile = 0x04;
+    shadow_oam[0].attr = 0x00;
+    shadow_oam[1].y = 0x24;
+    shadow_oam[1].x = 0x24;
+    shadow_oam[1].tile = 0x02;
+    shadow_oam[1].attr = 0x00;
+
+    //Make sure sprites and the background are drawn
+    rLCDC = LCDC_ON | LCDC_OBJON | LCDC_BGON;
+
+    //Setup the VBLANK interrupt, but we don't actually enable interrupt handling.
+    // We only do this, so HALT waits for VBLANK.
+    rIF = 0;
+    rIE = IE_VBLANK;
+
+    vram_memset(0x9800, 0x05, 32 * 18);
+    for(uint8_t x=0; x<20; x++) {
+        vram_set(0x9800 + x, 0x07);
+        vram_set(0x9A20 + x, 0x07);
+    }
+    for(uint8_t y=1; y<18; y++) {
+        vram_set(0x9800 + y * 0x20, 0x07);
+        vram_set(0x9800 + 19 + y * 0x20, 0x07);
+    }
+    vram_set(0x9800 + 3 + 3 * 0x20, 0x01);
+
+    while(1) {
+        joypad_update();
+        if (joypad_state & PAD_LEFT) cursor_x --;
+        if (joypad_state & PAD_RIGHT) cursor_x ++;
+        if (joypad_state & PAD_UP) cursor_y --;
+        if (joypad_state & PAD_DOWN) cursor_y ++;
+        if (joypad_state & (PAD_A | PAD_B)) {
+            vram_set(0x9800 + cursor_x / 8 + cursor_y / 8 * 0x20, 0x03);
+        }
+
+        // Screen to OAM coordinates
+        shadow_oam[0].y = cursor_y + 16;
+        shadow_oam[0].x = cursor_x + 8;
+
+        //Wait for VBLANK
+        HALT();
+        rIF = 0;    //As global interrupts are not enabled, we need to clear the interrupt flag.
+
+        //Copy the sprites into OAM memory
+        oam_dma_copy();
+    }
+}