怎么配置里还有DMA的配置啊,要如何做?
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RXFIFTL sets the trigger level for the receiver FIFO. When the trigger level is reached, a receiver data-ready interrupt is generated (if the interrupt request is enabled). Once the FIFO drops below the trigger level, the interrupt is cleared.
RXFIFTL设定了FIFO的trigger level。
你单步发送字符的时候,看一下中断标志位,看是否是在发送完N个字符后,产生的uart中断事件。