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请问，对于不同晶振的主从机，BLE是如何保证稳定的连接间隔的？
如果设置连接间隔是稳定的20ms，主从机就会每隔20ms进行一次通信，但是对于主从机的晶振不同，其时钟应该不完全相同，若干时间后，主从机的时间差会越来越大，但是连接间隔确实稳定的，请问TI是怎么做的？
BLE spec要求睡眠时钟的漂移至少为 ±500 ppm
Sleep clock accuracy具体实现方式可查看Bluetooth Core Specifications Version 5.2 Vol 6, Part B, §4.2.4.
参考类似的问题：https://e2e.ti.com/support/wireless-connectivity/bluetooth-group/bluetooth/f/bluetooth-forum/594098/cc2650-getting-the-offset-of-the-connection-reference-clock/2183679#2183679
