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LAUNCHXL-CC1352R1: unresolved symbol usleep, first referenced in <whole-program>

Part Number: LAUNCHXL-CC1352R1
Other Parts Discussed in Thread: SYSBIOS

SDK: simplelink_cc13xx_cc26xx_sdk_6_10_00_29

在simple_central 中加入 usleep 會得到錯誤訊息

unresolved symbol usleep, first referenced in <whole-program>   

已經有incluse以下header

#include <stdint.h>
#include <stddef.h>
#include <unistd.h>

請問還有其他需要include嗎?