Add CMakeLists.txt file (#204)

Author: AniruddhaKanhere

CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required( VERSION 3.15 )
+
+project( FreeRTOS-Cellular-Interface LANGUAGES C )
+
+# ------------------------------------------------------------------------------
+# Includes
+# ------------------------------------------------------------------------------
+
+include( ${CMAKE_CURRENT_LIST_DIR}/cellularInterfaceFilePaths.cmake )
+
+# ------------------------------------------------------------------------------
+# Library targets
+# ------------------------------------------------------------------------------
+
+add_library( cellular_interface INTERFACE )
+target_sources( cellular_interface INTERFACE ${CELLULAR_COMMON_SOURCES} )
+
+target_include_directories( cellular_interface INTERFACE
+                            ${CELLULAR_INCLUDE_DIRS}
+                            ${CELLULAR_COMMON_INCLUDE_DIRS}
+                            ${CELLULAR_INTERFACE_INCLUDE_DIRS}
+                            ${CELLULAR_PRIVATE_DIRS} )

cellularInterfaceFilePaths.cmake

@@ -0,0 +1,25 @@
+# This file is to add source files and include directories
+# into variables so that it can be reused from different repositories
+# in their Cmake based build system by including this file.
+#
+# Files specific to the repository such as test runner, platform tests
+# are not added to the variables.
+
+# Cellular library source files.
+set( CELLULAR_COMMON_SOURCES
+     ${CMAKE_CURRENT_LIST_DIR}/source/cellular_at_core.c
+     ${CMAKE_CURRENT_LIST_DIR}/source/cellular_common.c
+     ${CMAKE_CURRENT_LIST_DIR}/source/cellular_common_api.c
+     ${CMAKE_CURRENT_LIST_DIR}/source/cellular_3gpp_urc_handler.c
+     ${CMAKE_CURRENT_LIST_DIR}/source/cellular_3gpp_api.c
+     ${CMAKE_CURRENT_LIST_DIR}/source/cellular_pkthandler.c
+     ${CMAKE_CURRENT_LIST_DIR}/source/cellular_pktio.c )
+
+# Cellular library include directory.
+set( CELLULAR_INCLUDE_DIRS ${CMAKE_CURRENT_LIST_DIR}/source/include )
+set( CELLULAR_COMMON_INCLUDE_DIRS ${CELLULAR_INCLUDE_DIRS}/common )
+set( CELLULAR_PRIVATE_DIRS ${CMAKE_CURRENT_LIST_DIR}/source/include/private )
+
+# Cellular interface include directory.
+set( CELLULAR_INTERFACE_INCLUDE_DIRS ${CMAKE_CURRENT_LIST_DIR}/source/interface )
+