My Chinese is not very good, but it looks like you are up and running
Let us know if you need further help
I use WICED-Smart-SDK-2.1.1.
1:How to set up the software to an external 32.768KHz crystal?
2:If you use an external 32.768KHz crystal. In the sleep mode power consumption can save much?
It appears that the source for accomplishing such was included above.
Power measurements have never been taken within this scenario, but in theory, an external oscillator should improve power consumption as noted in other posts