add bin export

Author: Neutree

platform.txt

@@ -84,6 +84,9 @@ recipe.objcopy.hex.pattern="{compiler.path}{compiler.elf2hex.cmd}" {compiler.elf
 recipe.size.pattern="{compiler.path}{compiler.size.cmd}" -B "{build.path}/{build.project_name}.elf"
 recipe.size.regex=\s*[0-9]+\s+[0-9]+\s+[0-9]+\s+([0-9]+).*
 
+## Save hex
+recipe.output.tmp_file={build.project_name}.bin
+recipe.output.save_file={build.project_name}.{build.variant}.bin
 
 # Uploader tools
 # -------------------