现在在做cc2541的低功耗，偶尔需要使用串口发送一些数据。当POWER_SAVING和HAL_UART=TRUE均使能的情况下，功耗一直8ma左右，怎么样才能在需要使用串口的时候打开串口，使用完毕后关闭串口，以降低功耗？
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