# ============================================================================
# mcu_config.cmake — RP2040 / Pico SDK configuration for the bootloader
# ============================================================================

# Step 1/3: called BEFORE project() — bootstrap the Pico SDK toolchain
macro(mcu_init)
    include(${CMAKE_SOURCE_DIR}/pico_sdk_import.cmake)
endmacro()

# Step 2/3: called AFTER project() — register SDK targets
macro(mcu_sdk_config)
    set(CMAKE_C_STANDARD          ${PROJECT_C_STANDARD})
    set(CMAKE_C_STANDARD_REQUIRED ON)
    pico_sdk_init()
endmacro()

# Step 3/3: called AFTER add_executable() — link SDK libs + configure target
function(mcu_link_target target)
    # Libraries needed by the bootloader.
    # hardware_flash is critical — the bootloader writes firmware to flash.
    target_link_libraries(${target} PRIVATE
        pico_stdlib
        hardware_uart
        hardware_dma
        hardware_flash
    )

    # Route stdio over USB-CDC for bootloader status messages
    pico_enable_stdio_usb(${target}  1)
    pico_enable_stdio_uart(${target} 0)

    # Generate .uf2 for initial bootloader flashing via BOOTSEL
    pico_add_extra_outputs(${target})
endfunction()