说明：  之前在网上搜了一下，没有找到STM32F407IGT6的原理封装图，无奈自己花了一上午时间把它画了一下，176管脚的，贡献给大家.protel格式的，希望对大家有用，如果有错误的地方，还请大家指正出来，免得误导后面的人
(Before the Internet search, there is no to find STM32F407IGT6 principle package diagram, but unfortunately spent the morning it drew 176 pin, contributed to the Protel format, we hope to useful, if there are errorsplace, please correct me out, so as not to mislead the back)