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cc2540 1ms定周期获取



hi 各位:

 我现在需要一个最小单位1ms的定周期

我使用osal_start_timerEx设置。结果功耗约2.5mA。

后来我是用timer3 定时1mS中断获取定周期1ms,功耗约3.0mA。

想用系统时钟获取准确的1ms,发现无法获取如此精细的1ms。

我该如何获取准确的1ms定周期,而且对功耗影响不大的方法?