CC3000 Force Re-scan

Hi Andy,

     We are trying to reproduce your scenario and come back with an answer. Are you using a specific sample application?

Miguel

Hi Andy,

The wlan_ioctl_get_scan_results() return the populated table inside the CC3000 of the surrounding APs.

The CC3000 populate this table according to generated scan policies.

Few terminologies explanation: 

• Dwell time - The amount of time the CC3000 sends probe request and listen to probe response/beacons per channel. It's important that this time will be long enough for the STA to hear all the APs on that channel. Advise to use defaults
• Channels mask - There are up to 13 channel, However in some countries regulatory domains prevent you from usage of a channel
• Scan cycle - Going for all supported channels and allocating the information for that. Calculated time: num of channel*dwell time
• Interval - The amount of time between scan-cycle. 

There are 2 different policies:

• While the CC3000 is not connected to any AP.
  In that case the CC3000 issues a "scan cycle" wait "interval time[cycle number]" The last entry in the list will be repeated until a connection. 
  The purpose of that is to try to connect very fast to an AP, and if there are non, increase the interval to save TX power.
• While the CC3000 is connected. In that case only a single interval is being used. Not sure exactly which one. (Igor?) 

- Elad

Elad, thanks for the details.  So it sounds like it is not possible to force a scan cycle.  I am setting all scan params to defaults where all 16 interval array values are 2000.

wlan_ioctl_set_scan_params(1, 20, 30, 2, 0x7FF, -100, 0, 205, intervals);

Miguel, I started with the MSP430 basic wifi application but added some more commands for additional control.  The init is the same, but here are my additional commands.

Connect:
s = wlan_connect(WLAN_SEC_UNSEC, "PHS-37f", 7, NULL, NULL, 0);

Disconnect:
s = wlan_disconnect();

Set scan params:
s = wlan_ioctl_set_scan_params(1, 20, 30, 2, 0x7FF, -100, 0, 205, intervals);

Show scan results:
s = wlan_ioctl_get_scan_results(0, (unsigned char *)&r);

 Delete policy:
wlan_ioctl_set_connection_policy(DISABLE, DISABLE, DISABLE);
wlan_reboot();

Reboot:
wlan_reboot();

void wlan_boot(void)
{

  //
  // WLAN On API Implementation
  //
  wlan_init( CC3000_UsynchCallback, sendWLFWPatch, sendDriverPatch, sendBootLoaderPatch, ReadWlanInterruptPin, WlanInterruptEnable, WlanInterruptDisable, WriteWlanPin);

  //
  // Trigger a WLAN device
  //
  wlan_start(0);


  // Turn on the LED 5 to indicate that we are active and initiated WLAN successfully
  P3OUT |= BIT5;

  //
  // Mask out all non-required events from CC3000
  //
  wlan_set_event_mask(HCI_EVNT_WLAN_KEEPALIVE|HCI_EVNT_WLAN_UNSOL_INIT|HCI_EVNT_WLAN_ASYNC_PING_REPORT);
}

void wlan_reboot(void)
{
  wlan_stop();
  P3OUT &= ~BIT5;
  P3OUT &= ~BIT7;
  DispatcherUartSendString("\r\nRestarting...");
  __delay_cycles(12000000);
  wlan_boot();
}

Hi Andy,

While the CC3000 is connected there is no active scan triggred.

Yael