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+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
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+
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+# This can be dropped into an external project to help locate this SDK
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+# It should be include()ed prior to project()
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+
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+# Copyright 2020 (c) 2020 Raspberry Pi (Trading) Ltd.
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+#
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+# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
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+# following conditions are met:
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+#
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+# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
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+# disclaimer.
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+#
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+# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
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+# disclaimer in the documentation and/or other materials provided with the distribution.
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+#
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+# 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
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+# derived from this software without specific prior written permission.
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+#
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+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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+# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+
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+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
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+ set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
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+ message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
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+endif ()
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+
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+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
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+ set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
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+ message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
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+endif ()
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+
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+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
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+ set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
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+ message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
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+endif ()
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+
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+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
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+ set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
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+ message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
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+endif ()
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+
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+if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
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+ set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
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+ message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
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+endif()
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+
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+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
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+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
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+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
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+set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
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+
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+if (NOT PICO_SDK_PATH)
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+ if (PICO_SDK_FETCH_FROM_GIT)
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+ include(FetchContent)
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+ set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
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+ if (PICO_SDK_FETCH_FROM_GIT_PATH)
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+ get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
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+ endif ()
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+ FetchContent_Declare(
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+ pico_sdk
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+ GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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+ GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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+ )
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+
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+ if (NOT pico_sdk)
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+ message("Downloading Raspberry Pi Pico SDK")
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+ # GIT_SUBMODULES_RECURSE was added in 3.17
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+ if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
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+ FetchContent_Populate(
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+ pico_sdk
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+ QUIET
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+ GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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+ GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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+ GIT_SUBMODULES_RECURSE FALSE
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+
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+ SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
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+ BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
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+ SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
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+ )
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+ else ()
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+ FetchContent_Populate(
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+ pico_sdk
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+ QUIET
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+ GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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+ GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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+
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+ SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
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+ BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
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+ SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
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+ )
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+ endif ()
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+
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+ set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
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+ endif ()
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+ set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
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+ else ()
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+ message(FATAL_ERROR
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+ "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
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+ )
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+ endif ()
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+endif ()
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+
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+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
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+if (NOT EXISTS ${PICO_SDK_PATH})
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+ message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
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+endif ()
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+
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+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
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+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
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+ message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
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+endif ()
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+
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+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
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+
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+include(${PICO_SDK_INIT_CMAKE_FILE})
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Satoshi Yoneda