first commit, corresponds to uxn/ea0584a2

LICENSE

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+MIT License
+
+Copyright (c) Devine Lu Linvega
+Copyright (c) 2021 Adrian "asie" Siekierka
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+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 OR COPYRIGHT HOLDERS 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.

Makefile

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+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+export TARGET	:=	$(shell basename $(CURDIR))
+export TOPDIR	:=	$(CURDIR)
+
+# specify a directory which contains the nitro filesystem
+# this is relative to the Makefile
+NITRO_FILES	:=
+
+# These set the information text in the nds file
+#GAME_TITLE     := My Wonderful Homebrew
+#GAME_SUBTITLE1 := built with devkitARM
+#GAME_SUBTITLE2 := http://devitpro.org
+
+include $(DEVKITARM)/ds_rules
+
+.PHONY: checkarm7 checkarm9 clean
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+all: checkarm7 checkarm9 $(TARGET).nds
+
+#---------------------------------------------------------------------------------
+checkarm7:
+	$(MAKE) -C arm7
+
+#---------------------------------------------------------------------------------
+checkarm9:
+	$(MAKE) -C arm9
+
+#---------------------------------------------------------------------------------
+$(TARGET).nds	: $(NITRO_FILES) arm7/$(TARGET).elf arm9/$(TARGET).elf
+	ndstool	-c $(TARGET).nds -7 arm7/$(TARGET).elf -9 arm9/$(TARGET).elf \
+	-b $(GAME_ICON) "$(GAME_TITLE);$(GAME_SUBTITLE1);$(GAME_SUBTITLE2)" \
+	$(_ADDFILES)
+
+#---------------------------------------------------------------------------------
+arm7/$(TARGET).elf:
+	$(MAKE) -C arm7
+
+#---------------------------------------------------------------------------------
+arm9/$(TARGET).elf:
+	$(MAKE) -C arm9
+
+#---------------------------------------------------------------------------------
+clean:
+	$(MAKE) -C arm9 clean
+	$(MAKE) -C arm7 clean
+	rm -f $(TARGET).nds $(TARGET).arm7 $(TARGET).arm9

README.md

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+# uxnds
+
+Quick and simple port of the [uxn virtual machine](https://wiki.xxiivv.com/site/uxn.html) to the
+NDS console.
+
+By default, uxnds will run /uxn/boot.rom.
+
+Use the latest devkitARM toolchain from the devkitPro organization to compile.

arm7/Makefile

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+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+include $(DEVKITARM)/ds_rules
+
+#---------------------------------------------------------------------------------
+# BUILD is the directory where object files & intermediate files will be placed
+# SOURCES is a list of directories containing source code
+# INCLUDES is a list of directories containing extra header files
+# DATA is a list of directories containing binary files
+# all directories are relative to this makefile
+#---------------------------------------------------------------------------------
+BUILD		:=	build
+SOURCES		:=	source
+INCLUDES	:=	include build
+DATA		:=
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+ARCH	:=	-mthumb-interwork
+
+CFLAGS	:=	-g -Wall -O2\
+		-mcpu=arm7tdmi -mtune=arm7tdmi -fomit-frame-pointer\
+		-ffast-math \
+		$(ARCH)
+
+CFLAGS	+=	$(INCLUDE) -DARM7
+CXXFLAGS	:=	$(CFLAGS) -fno-rtti -fno-exceptions -fno-rtti
+
+
+ASFLAGS	:=	-g $(ARCH)
+LDFLAGS	=	-specs=ds_arm7.specs -g $(ARCH) -Wl,--nmagic -Wl,-Map,$(notdir $*).map
+
+LIBS	:=	-lnds7
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS	:=	$(LIBNDS)
+
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export ARM7ELF	:=	$(CURDIR)/$(TARGET).elf
+export DEPSDIR	:=	$(CURDIR)/$(BUILD)
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir))
+
+CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+export OFILES	:=	$(addsuffix .o,$(BINFILES)) \
+			$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I$(CURDIR)/$(BUILD)
+
+export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+.PHONY: $(BUILD) clean
+
+#---------------------------------------------------------------------------------
+$(BUILD):
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) *.elf
+
+
+#---------------------------------------------------------------------------------
+else
+
+DEPENDS	:=	$(OFILES:.o=.d)
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+$(ARM7ELF)	:	$(OFILES)
+	@echo linking $(notdir $@)
+	@$(LD)  $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@
+
+
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data 
+#---------------------------------------------------------------------------------
+%.bin.o	:	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+-include $(DEPENDS)
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------

arm7/source/apu.c

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+#include "../../include/uxn.h"
+#include "../../include/apu.h"
+
+/*
+Copyright (c) 2021 Devine Lu Linvega
+Copyright (c) 2021 Andrew Alderwick
+Copyright (c) 2021 Adrian "asie" Siekierka
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE.
+*/
+
+static Sint32
+envelope(Apu *c, Uint32 age)
+{
+	if(!c->r) return 0x0888;
+	if(age < c->a) return 0x0888 * age / c->a;
+	if(age < c->d) return 0x0444 * (2 * c->d - c->a - age) / (c->d - c->a);
+	if(age < c->s) return 0x0444;
+	if(age < c->r) return 0x0444 * (c->r - age) / (c->r - c->s);
+	c->advance = 0;
+	return 0x0000;
+}
+
+void
+apu_render(Apu *c, Sint16 *sample_left, Sint16 *sample_right, int samples)
+{
+	Sint32 s, i;
+	if(!c->advance || !c->period) return;
+	for(i = 0; i < samples; i++) {
+		c->count += c->advance;
+		c->i += c->count / c->period;
+		c->count %= c->period;
+		if(c->i >= c->len) {
+			if(!c->repeat) {
+				c->advance = 0;
+				return;
+			}
+			c->i %= c->len;
+		}
+		s = (Sint8)(c->addr[c->i] + 0x80) * envelope(c, c->age++);
+		*sample_left++ += s * c->volume[0] / 0x180;
+		*sample_right++ += s * c->volume[1] / 0x180;
+	}
+}