20 files changed, 98 insertions, 26 deletions
diff --git a/.gitignore b/.gitignore
index 0902ca8..19dc4f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 build
-.vscode/**
-\ No newline at end of file
+.vscode/**
+.cache
diff --git a/.gitmodules b/.gitmodules
index 58b768d..fc98963 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,15 +1,15 @@
-[submodule "main/lib/pico-sdk"]
-	path = main/lib/pico-sdk
+[submodule "pico-sdk"]
+	path = lib/pico-sdk
 	url = https://github.com/raspberrypi/pico-sdk
 	branch = 1.5.1
 	shallow = true
-[submodule "test/lib/googletest"]
-	path = test/lib/googletest
+[submodule "googletest"]
+	path = lib/googletest
 	url = https://github.com/google/googletest
 	branch = v1.14.0
 	shallow = true
-[submodule "main/lib/FreeRTOS-Kernel"]
-	path = main/lib/FreeRTOS-Kernel
+[submodule "FreeRTOS-Kernel"]
+	path = lib/FreeRTOS-Kernel
 	url = https://github.com/FreeRTOS/FreeRTOS-Kernel
 	branch = V11.1.0
 	shallow = true
diff --git a/client/.gitignore b/client/.gitignore
new file mode 100644
index 0000000..ba2906d
--- /dev/null
+++ b/client/.gitignore
@@ -0,0 +1 @@
+main
diff --git a/client/CMakeLists.txt b/client/CMakeLists.txt
new file mode 100644
index 0000000..9e433b1
--- /dev/null
+++ b/client/CMakeLists.txt
@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.29)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
+
+include(../proto/include.cmake)
+
+project(puzzlebox_client C CXX)
+
+add_executable(main
+	main.cpp
+	)
+
diff --git a/client/compile_commands.json b/client/compile_commands.json
new file mode 120000
index 0000000..25eb4b2
--- /dev/null
+++ b/client/compile_commands.json
@@ -0,0 +1 @@
+build/compile_commands.json
+\ No newline at end of file
diff --git a/client/main.cpp b/client/main.cpp
new file mode 100644
index 0000000..7a05049
--- /dev/null
+++ b/client/main.cpp
@@ -0,0 +1,25 @@
+#include <cstdio>
+#include <string>
+
+#include "puzbusv1.pb.h"
+
+int main() {
+	GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+	puzbus::I2CMsg test_msg;
+
+	test_msg.set_address(0x39);
+	test_msg.set_data("Test message data!");
+
+	std::string output;
+	test_msg.SerializeToString(&output);
+
+	printf("output[%lu]:\n", output.size());
+	for (size_t i = 0; i < output.size(); i++) {
+		printf("%02x ", output[i]);
+	}
+	printf("\n");
+
+	return 0;
+}
+
diff --git a/client/makefile b/client/makefile
new file mode 100644
index 0000000..8352615
--- /dev/null
+++ b/client/makefile
@@ -0,0 +1,2 @@
+include ../lazy.mk
+
diff --git a/lazy.mk b/lazy.mk
new file mode 100644
index 0000000..2620961
--- /dev/null
+++ b/lazy.mk
@@ -0,0 +1,20 @@
+# this file is for lazy people (loek)
+
+BUILD_DIR ?= build
+TARGET ?= $(BUILD_DIR)/main
+
+.PHONY: FORCE
+
+all: FORCE $(TARGET)
+
+$(BUILD_DIR)/build.ninja: CMakeLists.txt
+	mkdir -p $(BUILD_DIR)
+	cmake -B $(BUILD_DIR) -G Ninja --fresh --log-level WARNING
+
+$(TARGET): $(BUILD_DIR)/build.ninja FORCE
+	ninja -C $(BUILD_DIR)
+# ninja automatically builds in parallel, so is preferred
+
+clean: FORCE
+	$(RM) -r $(BUILD_DIR)
+
diff --git a/main/lib/FreeRTOS-Kernel b/lib/FreeRTOS-Kernel
-Subproject dbf70559b27d39c1fdb68dfb9a32140b6a6777a
+Subproject dbf70559b27d39c1fdb68dfb9a32140b6a6777a
diff --git a/test/lib/googletest b/lib/googletest
-Subproject 5197b1a8e6a1ef9f214f4aa537b0be17cbf9194
+Subproject 5197b1a8e6a1ef9f214f4aa537b0be17cbf9194
diff --git a/main/lib/pico-sdk b/lib/pico-sdk
-Subproject 6a7db34ff63345a7badec79ebea3aaef1712f37
+Subproject 6a7db34ff63345a7badec79ebea3aaef1712f37
diff --git a/main/.gitignore b/main/.gitignore
index 7c3ba25..0e56cf2 100644
--- a/main/.gitignore
+++ b/main/.gitignore
@@ -1,3 +1 @@
 config.h
-build
-.cache
diff --git a/main/lib b/main/lib
new file mode 120000
index 0000000..dc598c5
--- /dev/null
+++ b/main/lib
@@ -0,0 +1 @@
+../lib
+\ No newline at end of file
diff --git a/main/makefile b/main/makefile
index 1986cd3..9df4f09 100644
--- a/main/makefile
+++ b/main/makefile
@@ -1,22 +1,9 @@
-# this file is for lazy people (loek)
+TARGET = $(BUILD_DIR)/main.uf2
 
-.PHONY: FORCE
+include ../lazy.mk
 
-all: FORCE build/main.uf2
-
-build/build.ninja: CMakeLists.txt
-	mkdir -p build
-	cmake -B build -G Ninja --fresh --log-level WARNING
-
-build/main.uf2: build/build.ninja FORCE
-	ninja -C build
-# ninja automatically builds in parallel, so is preferred
-
-flash: build/main.uf2 FORCE
+flash: $(TARGET) FORCE
 	picotool load -fx $<
 # -f forces a reboot of the pico before flashing
 # -x resets the pico after flashing
 
-clean: FORCE
-	$(RM) -r build
-
diff --git a/proto/.gitignore b/proto/.gitignore
new file mode 100644
index 0000000..75feca5
--- /dev/null
+++ b/proto/.gitignore
@@ -0,0 +1 @@
+*.pb.*
diff --git a/proto/include.cmake b/proto/include.cmake
new file mode 100644
index 0000000..d5beaef
--- /dev/null
+++ b/proto/include.cmake
@@ -0,0 +1 @@
+include_directories(${CMAKE_CURRENT_LIST_DIR})
diff --git a/proto/makefile b/proto/makefile
new file mode 100644
index 0000000..3bc4ca4
--- /dev/null
+++ b/proto/makefile
@@ -0,0 +1,7 @@
+PROTOCARGS += --cpp_out .
+
+all: puzbusv1.pb.cc puzbusv1.pb.h
+
+%.pb.cc %.pb.h &: %.proto
+	protoc $(PROTOCARGS) $<
+
diff --git a/proto/puzbusv1.proto b/proto/puzbusv1.proto
new file mode 100644
index 0000000..6b4fa52
--- /dev/null
+++ b/proto/puzbusv1.proto
@@ -0,0 +1,12 @@
+syntax = "proto2";
+
+package puzbus;
+
+message I2CMsg {
+	// 32-bit is the smallest integer format supported by protobuf, even though
+	// we only need 7-10 bits for the I2C address.
+	required uint32 address = 1;
+
+	optional bytes data = 2;
+}
+
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index a0bd099..a280a86 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -20,4 +20,4 @@ target_link_libraries(tests PRIVATE gtest_main)
 add_test(
 	NAME tests
 	COMMAND tests
-)
-\ No newline at end of file
+)
diff --git a/test/lib b/test/lib
new file mode 120000
index 0000000..dc598c5
--- /dev/null
+++ b/test/lib
@@ -0,0 +1 @@
+../lib
+\ No newline at end of file