Move C++ tree into firmware/

firmware/CMakeLists.txt

@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.13)
+
+set(PICO_BOARD pico2)
+
+include(pico_sdk_import.cmake)
+
+project(picomap C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 23)
+pico_sdk_init()
+
+add_executable(picomap
+	main.cpp
+	dhcp.cpp
+	net.cpp
+	tusb_config.cpp
+	w6300/w6300.cpp
+)
+
+target_include_directories(picomap PRIVATE
+	include
+	w6300
+)
+
+target_compile_options(picomap PRIVATE -Wall -Wextra -Wno-unused-parameter)
+
+pico_generate_pio_header(picomap ${CMAKE_CURRENT_LIST_DIR}/w6300/qspi.pio)
+
+pico_enable_stdio_usb(picomap 0)
+pico_enable_stdio_uart(picomap 0)
+
+pico_add_extra_outputs(picomap)
+
+target_link_libraries(picomap pico_stdlib pico_rand tinyusb_device tinyusb_board hardware_pio hardware_spi hardware_dma hardware_clocks)