- change to use CMAKE_SYSTEM_CPU to prevent CMAKE_SYSTEM_PROCESSOR conflict with zephyr

- change tinyusb CMakeLists.txt to function tinyusb_target_add() instead of defining tinyusb lib target

hw/bsp/samd21/family.cmake

@@ -6,7 +6,7 @@ set(SDK_DIR ${TOP}/hw/mcu/microchip/samd21)
 include(${CMAKE_CURRENT_LIST_DIR}/boards/${BOARD}/board.cmake)
 
 # toolchain set up
-set(CMAKE_SYSTEM_PROCESSOR cortex-m0plus CACHE INTERNAL "System Processor")
+set(CMAKE_SYSTEM_CPU cortex-m0plus CACHE INTERNAL "System Processor")
 set(CMAKE_TOOLCHAIN_FILE ${TOP}/examples/build_system/cmake/toolchain/arm_${TOOLCHAIN}.cmake)
 
 set(FAMILY_MCUS SAMD21 CACHE INTERNAL "")
@@ -97,13 +97,10 @@ function(family_configure_example TARGET RTOS)
 
   # Add TinyUSB target and port source
   family_add_tinyusb(${TARGET} OPT_MCU_SAMD21 ${RTOS})
-  target_sources(${TARGET}-tinyusb PUBLIC
+  target_sources(${TARGET} PUBLIC
     ${TOP}/src/portable/microchip/samd/dcd_samd.c
     )
-  target_link_libraries(${TARGET}-tinyusb PUBLIC board_${BOARD})
-
-  # Link dependencies
-  target_link_libraries(${TARGET} PUBLIC board_${BOARD} ${TARGET}-tinyusb)
+  target_link_libraries(${TARGET} PUBLIC board_${BOARD})
 
   # Flashing
   family_add_bin_hex(${TARGET})