cc3200如何改变WiFi扫描周期 使扫描周期小于1s

参考SCAN_POLICY例程中

    //
    // set scan cycle to 10 seconds 
    //
    policyVal.uiPolicyLen = 1;
    //
    // set scan policy - this starts the scan 
    //
    lRetVal = sl_WlanPolicySet(SL_POLICY_SCAN , ucpolicyOpt,
                               (unsigned char*)(policyVal.ucPolicy), sizeof(policyVal));

如何使扫描频率小于1秒？1秒对于我来说有点慢