介绍STM32f4的使用, 便于使用者开发应用。非常不错的ARM。例程多。欢迎大家下载使用。方便可靠。在音频设计中使用的比较多。网关也可以考虑使用。(introduce STM32f4. It is useful for the beginners. please use it and give our feedback. It is pleasure that hear your comments. Thank you for your attention. I should waiting for your feedback and questions.)