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CC2642R: UART2_read读到完整一帧的数据

Part Number: CC2642R


串口输出为每帧4字节01020304,使用UART2_read(uart, isrRxBuf,4, NULL)读取,如何可以读到完整的一帧数据,目前读到的数据是并不是完整的一帧,读到的可能是01010201等等