pi pico with c/c++ pico_sdk_import.cmake

pico_sdk_import.cmake

# This is a copy of /external/pico_sdk_import.cmake  

# This can be dropped into an external project to help locate this SDK 
# It should be include()ed prior to project() 

# todo document 

if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH)) 
set(PICO_SDK_PATH $ENV{PICO_SDK_PATH}) 
message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')") 
endif () 

if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT)) 
set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT}) 
message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')") 
endif () 

if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH)) 
set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH}) 
message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')") 
endif () 

set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the PICO SDK") 
set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of PICO SDK from git if not otherwise locatable") 
set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK") 

if (NOT PICO_SDK_PATH) 
if (PICO_SDK_FETCH_FROM_GIT) 
include(FetchContent) 
set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR}) 
if (PICO_SDK_FETCH_FROM_GIT_PATH) 
get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}") 
endif () 
FetchContent_Declare( 
pico_sdk 
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk 
GIT_TAG master 
) 
if (NOT pico_sdk) 
message("Downloading PICO SDK") 
FetchContent_Populate(pico_sdk) 
set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR}) 
endif () 
set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE}) 
else () 
message(FATAL_ERROR 
"PICO SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git." 
) 
endif () 
endif () 

get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}") 
if (NOT EXISTS ${PICO_SDK_PATH}) 
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found") 
endif () 

set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake) 
if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE}) 
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the PICO SDK") 
endif () 

set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the PICO SDK" FORCE) 

include(${PICO_SDK_INIT_CMAKE_FILE})