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TM4C1290 串口接收+DMA 如何实现类似环绕功能(纯硬件方式放大FIFO)

应应用需求,串口不使用中断方式,在接收轮询时,8级FIFO不够用需要放大,查看手册该芯片DMA不支持环绕功能。想请问下是否有其他的方案可以满足该需求?