CC3100 - sl_WlanGet not returning the correct RSSI

Lenio Cacula

The function sl_WlanGet ALWAYS returns a RSSI value of -95dB.

Here is the code running inside of the wlan_station example, after the connection with the AP is established:

   int16_t                  status = -1;
    SlGetRxStatResponse_t    rxStatResp;
    slWlanScanParamCommand_t ScanParamConfig;
    uint16_t                 Option = WLAN_GENERAL_PARAM_OPT_SCAN_PARAMS;
    uint16_t                 OptionLen = sizeof(slWlanScanParamCommand_t);

    status =  sl_WlanGet(SL_WLAN_CFG_GENERAL_PARAM_ID ,&Option,&OptionLen,(unsigned char *)&ScanParamConfig);
    if(status < 0)
    {
        returnStatus = -1;
    }
    else
    {
        *rssi = ScanParamConfig.rssiThershold;
    }

Do you have any comments on how to read the correct RSSI value?

We do not want to use the function sl_WlanGetNetworkList() because it requires to much computational effort and consequently battery power. sl_WlanGetNetworkList() works fine though.

Thank you!

over 8 years ago

0 Jan D over 8 years ago

Guru 78965 points

Hi,

Reason of your issue is simple. You use wrong API. Your code returns configuration (scan threshold) instead current RSSI value. Default value of this threshold is set to -95.

To read current RSSI you need to use this API:

SlGetRxStatResponse_t rssiRxStat;

int rssiDataAct;

if (sl_WlanRxStatGet(&rssiRxStat, 0) == 0) {
  if (rssiRxStat.AvarageDataCtrlRssi != 0) {
    rssiDataAct = rssiRxStat.AvarageDataCtrlRssi;
  }
} else {
  rssiDataAct = -99;
}

In this case is RSSI value counted from data packets. If you call this API every 5 sec, then you will have RSSI from previous 5 sec.

Jan

Wi-Fi

Wi-Fi forum

CC3100 - sl_WlanGet not returning the correct RSSI