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‎.gitignore‎

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.build
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.cache
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.packages
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.pio
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.vscode
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.DS_Store
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compile_commands*
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due
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qemu

‎Makefile‎

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.DEFAULT_GOAL := all
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dir_guard=@mkdir -p $(@D)
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ifeq ($(DEBUG),1)
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opt_flags := -Og -g2 -ggdb2
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else
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opt_flags := -Os -g0 -ffunction-sections -fdata-sections
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endif
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CFLAGS := -std=gnu17 -nostdlib $(opt_flags)
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CXXFLAGS := -std=gnu++17 -nostdlib $(opt_flags)
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# QEMU doesn't support any ez-clang lib yet
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qemu/include/:
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$(dir_guard)
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qemu/lib/:
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$(dir_guard)
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include_dirs := src include
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includes := $(addprefix -I,$(include_dirs))
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due_flags := -mcpu=cortex-m3 -mthumb --config armv7m_soft_nofp_nosys
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due_defs := -D__SAM3X8E__ -DARDUINO_SAM_DUE -DARDUINO=10805 -DARDUINO_ARCH_SAM
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due_defs += -DF_CPU=84000000L -DUSBCON -DUSB_VID=0x2341 -DUSB_PID=0x003E
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.build/due/ez/stdio/printf.cc.o: src/ez/stdio/printf.cc
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$(dir_guard)
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$(CXX) $(CXXFLAGS) $(due_flags) $(due_defs) $(includes) -c $< -o $@
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due/lib/ez/stdio/printf.a: .build/due/ez/stdio/printf.cc.o
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$(dir_guard)
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$(AR) cr $@ $<
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ifdef ARDUINO_DIR
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arduino_include_subdirs := cores/arduino variants/arduino_due_x
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arduino_include_subdirs += system/libsam system/CMSIS/CMSIS/Include system/CMSIS/Device/ATMEL
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arduino_includes := $(addprefix -I$(ARDUINO_DIR)/,$(arduino_include_subdirs))
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arduino_c := $(shell find $(ARDUINO_DIR)/cores/arduino -name '*.c')
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arduino_cpp := $(shell find $(ARDUINO_DIR)/cores/arduino -name '*.cpp')
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arduino_cpp += $(ARDUINO_DIR)/variants/arduino_due_x/variant.cpp
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arduino_c_o := $(arduino_c:$(ARDUINO_DIR)/%=.build/due/ez/framework/%.o)
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arduino_cpp_o := $(arduino_cpp:$(ARDUINO_DIR)/%=.build/due/ez/framework/%.o)
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endif
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.build/due/ez/framework/%.c.o: $(ARDUINO_DIR)/%.c
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$(dir_guard)
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$(CC) $(CFLAGS) $(due_flags) $(due_defs) $(arduino_includes) -c $< -o $@
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.build/due/ez/framework/%.cpp.o: $(ARDUINO_DIR)/%.cpp
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$(dir_guard)
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$(CXX) $(CXXFLAGS) $(due_flags) $(due_defs) $(arduino_includes) -c $< -o $@
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due/lib/ez/framework/Arduino.a: $(arduino_cpp_o) $(arduino_c_o)
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$(dir_guard)
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$(AR) cr $@ $(arduino_cpp_o) $(arduino_c_o)
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due/lib/: due/lib/ez/framework/Arduino.a due/lib/ez/stdio/printf.a
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due/include/:
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$(dir_guard)
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cp -r include due/.
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mkdir -p due/include/ez/framework
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cp $(ARDUINO_DIR)/cores/arduino/Arduino.h due/include/ez/framework/
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.PHONY: due
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due: due/include/ due/lib/
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.PHONY: qemu
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qemu: qemu/include/ qemu/lib/
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.PHONY: all
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all: due qemu
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.PHONY: clean
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clean:
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rm -rf .build
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rm -rf due
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rm -rf qemu

‎build.sh‎

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#!/bin/bash
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if [ ! -d ".packages" ]; then
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echo "Downloading dependencies.."
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./setup.sh
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fi
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export ARDUINO_DIR=$(pwd)/.packages/framework-arduino-sam
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export PATH=$PATH:$(pwd)/.packages/toolchain-clang-arm/bin
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export AR=llvm-ar
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export CC=clang
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export CXX=clang++
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mkdir -p due
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mkdir -p qemu
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make
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#make SHELL='sh -x'
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function dump() {
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for f in "$@"; do echo " $f"; done
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}
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echo "Arduino Due"
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echo "- archives:"
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dump $(find due -name '*.a')
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echo "- headers:"
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dump $(find due -name '*.h')
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echo "LM3S811 (QEMU)"
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echo "- archives:"
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dump $(find qemu -name '*.a')
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echo "- headers:"
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dump $(find qemu -name '*.h')

‎include/ez/fixpoint/mapRange.h‎

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#ifndef EZ_FIXPOINT_MAPRANGE_H
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#define EZ_FIXPOINT_MAPRANGE_H
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#include <cstdint>
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namespace {
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template <uint32_t Value>
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constexpr uint32_t max_shift() {
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static_assert((Value & 0xFF000000) == 0, "Not enough free leading bits");
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if constexpr (((Value << 4) & 0x80000000) != 0)
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return 4;
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if constexpr (((Value << 5) & 0x80000000) != 0)
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return 5;
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if constexpr (((Value << 6) & 0x80000000) != 0)
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return 6;
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if constexpr (((Value << 7) & 0x80000000) != 0)
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return 7;
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if constexpr (((Value << 8) & 0x80000000) != 0)
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return 8;
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if constexpr (((Value << 9) & 0x80000000) != 0)
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return 9;
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if constexpr (((Value << 10) & 0x80000000) != 0)
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return 10;
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if constexpr (((Value << 11) & 0x80000000) != 0)
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return 11;
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if constexpr (((Value << 12) & 0x80000000) != 0)
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return 12;
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if constexpr (((Value << 13) & 0x80000000) != 0)
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return 13;
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if constexpr (((Value << 14) & 0x80000000) != 0)
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return 14;
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if constexpr (((Value << 15) & 0x80000000) != 0)
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return 15;
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if constexpr (((Value << 16) & 0x80000000) != 0)
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return 16;
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if constexpr (((Value << 17) & 0x80000000) != 0)
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return 17;
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if constexpr (((Value << 18) & 0x80000000) != 0)
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return 18;
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if constexpr (((Value << 19) & 0x80000000) != 0)
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return 19;
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if constexpr (((Value << 20) & 0x80000000) != 0)
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return 20;
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if constexpr (((Value << 21) & 0x80000000) != 0)
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return 21;
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if constexpr (((Value << 22) & 0x80000000) != 0)
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return 22;
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if constexpr (((Value << 23) & 0x80000000) != 0)
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return 23;
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if constexpr (((Value << 24) & 0x80000000) != 0)
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return 24;
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if constexpr (((Value << 25) & 0x80000000) != 0)
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return 25;
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if constexpr (((Value << 26) & 0x80000000) != 0)
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return 26;
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if constexpr (((Value << 27) & 0x80000000) != 0)
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return 27;
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if constexpr (((Value << 28) & 0x80000000) != 0)
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return 28;
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if constexpr (((Value << 29) & 0x80000000) != 0)
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return 29;
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if constexpr (((Value << 30) & 0x80000000) != 0)
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return 30;
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if constexpr (((Value << 31) & 0x80000000) != 0)
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return 31;
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static_assert(Value > 0, "Zero is not a valid max value");
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}
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template <uint32_t Value1, uint32_t Value2>
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constexpr uint32_t min_value() {
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return Value1 < Value2 ? Value1 : Value2;
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}
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}
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namespace ez {
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template <uint32_t in_min, uint32_t in_max, uint32_t out_min, uint32_t out_max>
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uint32_t mapRange(uint32_t x) {
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constexpr uint32_t shift = min_value<max_shift<in_max + 1>(),
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max_shift<out_max + 1>()>();
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constexpr uint32_t factor =
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((out_max - out_min + 1) << shift) / (in_max - in_min + 1);
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return (((x - in_min) * factor) >> shift) + out_min;
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}
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}
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#endif // EZ_FIXPOINT_MAPRANGE_H

‎include/ez/stdio/printf.h‎

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#ifndef EZ_STDIO_PRINTF_H
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#define EZ_STDIO_PRINTF_H
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namespace ez {
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void printf(const char* fmt, ...);
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}
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#endif // EZ_STDIO_PRINTF_H

‎setup.sh‎

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#!/bin/bash
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set -e
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mkdir -p .packages
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if [ ! -d ".packages/toolchain-clang-arm" ]; then
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wget -q --show-progress -O .packages/toolchain-clang-arm-13.tar.gz https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm/releases/download/release-13.0.0/LLVMEmbeddedToolchainForArm-13.0.0-linux.tar.gz
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tar zxf .packages/toolchain-clang-arm-13.tar.gz -C .packages
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mv .packages/LLVMEmbeddedToolchainForArm-13.0.0 .packages/toolchain-clang-arm
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fi
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if [ ! -d ".packages/framework-arduino-sam" ]; then
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wget -q --show-progress -O .packages/framework-arduino-sam-clang.tar.gz https://github.com/echtzeit-dev/framework-arduino-sam/archive/refs/tags/ez-clang-0.0.5.tar.gz
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tar zxf .packages/framework-arduino-sam-clang.tar.gz -C .packages
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mv .packages/framework-arduino-sam-ez-clang-0.0.5 .packages/framework-arduino-sam
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fi

‎src/ez/stdio/printf.cc‎

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#include "ez/stdio/printf.h"
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#include <cstdarg>
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#include <cstddef>
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#include <cstdio>
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#include <cstring>
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extern "C" {
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char *__ez_clang_inline_heap_acquire(size_t);
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void __ez_clang_report_string(const char *Data, size_t Size);
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}
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namespace ez {
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void printf(const char* Fmt, ...) {
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va_list Args;
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va_start(Args, Fmt);
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size_t Capacity = strlen(Fmt) + 20;
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char *Buffer = __ez_clang_inline_heap_acquire(Capacity);
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int Length = vsnprintf(Buffer, Capacity, Fmt, Args);
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__ez_clang_report_string(Buffer, Length);
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va_end(Args);
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}
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}

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