From 2809b83ee4d0fde8ebb406d4cdd39d142840254c Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Tue, 13 Apr 2021 17:34:33 +0200
Subject: Initial commit of gba template compilation with custom Makefile

---
 .gitignore |  1 +
 Makefile   | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.c | 33 ++++++++++++++++++++++++++++
 3 files changed, 106 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 src/main.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..378eac2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..46564cc
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,72 @@
+.POSIX:
+.SUFFIXES:
+
+# Path to the development kit (devkitARM) and the GBA library.
+DEVKITPRO  := /opt/devkitpro
+DEVKITARM  := /opt/devkitpro/devkitARM
+PATH       := $(DEVKITARM)/bin:$(PATH)
+LIBGBA_DIR := $(DEVKITPRO)/libgba
+LIBGBA_SRC := /opt/devkitpro/libgba/include/
+LIBGBA     := $(LIBGBA_DIR)/lib/libgba.a
+LIBGBA     += $(LIBGBA_DIR)/lib/libfat.a
+LIBGBA     += $(LIBGBA_DIR)/lib/libmm.a
+
+# Source code location and files to watch for changes.
+SRC_DIR        := src
+SRC_MAIN       := $(SRC_DIR)/main.c
+WATCH_SRC      := $(wildcard $(SRC_DIR)/*.c)
+WATCH_SRC      += $(wildcard $(SRC_DIR)/*.h)
+
+# Output library names and executables.
+BIN_NAME       := template
+BUILD_DIR      := build
+ELF            := $(BUILD_DIR)/$(BIN_NAME).elf
+BIN            := $(BUILD_DIR)/$(BIN_NAME).gba
+
+# Compiler and linker configuration.
+CC             := arm-none-eabi-gcc
+OBJCOPY        := arm-none-eabi-objcopy
+ARCH           := -mthumb -mthumb-interwork
+SPECS          := -specs=gba.specs
+CFLAGS         := -g -Wall -Wextra -pedantic
+CFLAGS         += -mcpu=arm7tdmi -mtune=arm7tdmi $(ARCH)
+CFLAGS         += -I$(LIBGBA_SRC)
+LDFLAGS        := $(ARCH) $(SPECS)
+LDLIBS         := $(LIBGBA)
+RELEASE_CFLAGS := -DNDEBUG -O2
+DEBUG_CFLAGS   := -DDEBUG -O2
+
+.PHONY: clean run
+
+# Setup debug/release builds.
+#     make clean && make <target> DEBUG=0
+#     make clean && make <target> DEBUG=1
+DEBUG ?= 0
+ifeq ($(DEBUG), 1)
+    CFLAGS += $(DEBUG_CFLAGS)
+else
+    CFLAGS += $(RELEASE_CFLAGS)
+endif
+
+main: $(BUILD_DIR) $(BIN)
+
+# Strip and fix header to create final .gba file.
+$(BIN): $(ELF)
+	$(OBJCOPY) -v -O binary $(ELF) $(BIN)
+	gbafix $(BIN)
+
+# Link files.
+$(ELF): $(SRC_MAIN) $(WATCH_SRC)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $(ELF) $(SRC_MAIN) $(LDLIBS)
+
+# Create build directory if needed.
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
+
+# Test the output .gba in an emulator.
+run: main
+	mgba-qt $(BIN)
+
+# Remove build directory.
+clean:
+	rm -r $(BUILD_DIR)
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..64f6234
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,33 @@
+#include <gba_console.h>
+#include <gba_video.h>
+#include <gba_interrupt.h>
+#include <gba_systemcalls.h>
+#include <gba_input.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+//---------------------------------------------------------------------------------
+// Program entry point
+//---------------------------------------------------------------------------------
+int main(void) {
+//---------------------------------------------------------------------------------
+
+
+	// the vblank interrupt must be enabled for VBlankIntrWait() to work
+	// since the default dispatcher handles the bios flags no vblank handler
+	// is required
+	irqInit();
+	irqEnable(IRQ_VBLANK);
+
+	consoleDemoInit();
+
+	// ansi escape sequence to set print co-ordinates
+	// /x1b[line;columnH
+	iprintf("\x1b[10;10HHello World!\n");
+
+	while (1) {
+		VBlankIntrWait();
+	}
+}
+
+
-- 
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