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手册和代码里没有找到对应的寄存器
串口接收波特率是多少
这个需要在串口超时中断中算，DMA搬运地址减去首地址+手动搬运的
@zr 不好意思没看懂，我这边接收到的数据是不定长，不定内容的。常规的MCU都会有接口返回当前DMA接收位置偏移量，咱们这个怎么定位？