stm32自学笔记更好的学习stm32，一个更好的辅助资料，很有帮助。
STM32 self study notes to better learn STM32, a better supplementary information, very helpful. (2018-07-18, C51, 35936KB, 下载5次)
上海博通的蓝牙芯片BK3254资料：数据手册，参考原理图和pcb
BK3254 Designkit：datasheet，reference schematic and pcb (2016-08-02, C51, 911KB, 下载125次)