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ZigBee协议栈串口数据的传输

打算通过ZigBee协议栈串口函数接收518个数据,把接收最大字节数改为518:   #define MT_UART_RX_BUFF_MAX 518。

 再用该函数HalUARTRead(0,uartbuf,518)读取保存在uartbuf中,为什么uartbuf中只接收到274个数据?什么原因??急、、、、、