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对上次提交的增补,对rt_serial_tx_fifo中的buffer成员约束32字节地址对齐; 另外修复串口DMA接收,buffer因为不是32字节地址对齐,在SCB_InvalidateDCache_by_Addr时导致rt_serial_rx_fifo结构体中的其他成员数据被Invalidate,未同步写入到memory中的初始化数据被修改,最终造成总线错误,MCU卡死
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