More warning cleanup

- physically suppress warnings in TinyUSB headers using pragmas so they don't break -Werror compilation of external files that include them
 - fix compiler warnings in rp2040 port
 - add cmake method to rp2040 port to allow an external project to suppress warnings in TinyUSB itself

hw/bsp/rp2040/family.cmake

@@ -77,7 +77,6 @@ if (NOT TARGET _rp2040_family_inclusion_marker)
 			${TOP}/src/class/video/video_device.c
 			)
 
-
 	# Base config for host mode; wrapped by SDK's tinyusb_host
 	add_library(tinyusb_host_base INTERFACE)
 	target_sources(tinyusb_host_base INTERFACE
@@ -153,4 +152,28 @@ if (NOT TARGET _rp2040_family_inclusion_marker)
 		enable_language(C CXX ASM)
 		pico_sdk_init()
 	endfunction()
+
+	# This method must be called from the project scope to suppress known warnings in TinyUSB source files
+	function(suppress_tinyusb_warnings)
+		set_source_files_properties(
+				${PICO_TINYUSB_PATH}/src/tusb.c
+				PROPERTIES
+				COMPILE_FLAGS "-Wno-conversion")
+		set_source_files_properties(
+				${PICO_TINYUSB_PATH}/src/common/tusb_fifo.c
+				PROPERTIES
+				COMPILE_FLAGS "-Wno-conversion -Wno-cast-qual")
+		set_source_files_properties(
+				${PICO_TINYUSB_PATH}/src/device/usbd.c
+				PROPERTIES
+				COMPILE_FLAGS "-Wno-conversion -Wno-cast-qual -Wno-null-dereference")
+		set_source_files_properties(
+				${PICO_TINYUSB_PATH}/src/device/usbd_control.c
+				PROPERTIES
+				COMPILE_FLAGS "-Wno-conversion")
+		set_source_files_properties(
+				${PICO_TINYUSB_PATH}/src/class/cdc/cdc_device.c
+				PROPERTIES
+				COMPILE_FLAGS "-Wno-conversion")
+	endfunction()
 endif()