KW36 central device can not scan the device problem

jictannu — Fri, 15 Apr 2022 02:38:45 GMT

I am using sdk version 2.2.10, setting KW36 as the central device, and the scan configuration is as follows, I restart scanning every 100 and print the number of times scanned.

void BleApp_Start(bool_t addDevice) { if (!mScanningOn) { /* Set low power mode */ #if defined(cPWR_UsePowerDownMode) && (cPWR_UsePowerDownMode) #if defined(MULTICORE_APPLICATION_CORE) && (MULTICORE_APPLICATION_CORE) #if defined(gErpcLowPowerApiServiceIncluded_c) && (gErpcLowPowerApiServiceIncluded_c) (void)PWR_ChangeBlackBoxDeepSleepMode(gAppDeepSleepMode_c); #endif #else (void)PWR_ChangeDeepSleepMode(gAppDeepSleepMode_c); #endif #endif /* Range: 0U = -30dbM to 31U = +3,5dBm, steplength ~ 1dbm */ Controller_SetTxPowerLevel(31U,gConnTxChannel_c); // = 3,5 dbm if(addDevice) { gScanParams.filterPolicy = gScanAll_c; } else { gScanParams.filterPolicy = gScanWithWhiteList_c; } /* Start scanning */ (void)App_StartScanning(&gScanParams, BleApp_ScanningCallback, gGapDuplicateFilteringEnable_c, gGapScanContinuously_d, gGapScanPeriodicDisabled_d); } } static void BleApp_ScanningCallback(gapScanningEvent_t* pScanningEvent) { static bool_t isScanTimeout = FALSE; switch (pScanningEvent->eventType) { case gDeviceScanned_c: { mFoundDeviceToConnect = CheckScanEvent( &pScanningEvent->eventData.scannedDevice); if (mFoundDeviceToConnect) { gConnReqParams.peerAddressType = pScanningEvent->eventData.scannedDevice.addressType; FLib_MemCpy(gConnReqParams.peerAddress, pScanningEvent->eventData.scannedDevice.aAddress, sizeof(bleDeviceAddress_t)); bleResult_t Gap_StopScanning_status = Gap_StopScanning(); #if defined(gAppUsePrivacy_d) && (gAppUsePrivacy_d) gConnReqParams.usePeerIdentityAddress = pScanningEvent->eventData.scannedDevice.advertisingAddressResolved; #endif bleResult_t App_Connect_status = App_Connect(&gConnReqParams, BleApp_ConnectionCallback); #if Debug_Support SEGGER_RTT_printf(0, "\r\nGap_StopScanning() status:0x%X \r\n", Gap_StopScanning_status); SEGGER_RTT_printf(0, "\r\nApp_Connect() status:0x%X \r\n", App_Connect_status); #endif } mFoundDevicesCount++; } break; case gScanStateChanged_c: { mScanningOn = !mScanningOn; /* Node starts scanning */ if (mScanningOn) { mFoundDeviceToConnect = FALSE; #if Debug_Support SEGGER_RTT_printf(0, "\r\nScanning...\r\n"); #endif /* Start scanning timer */ // TMR_StartLowPowerTimer(mAppTimerId, // gTmrLowPowerSecondTimer_c, gScanningTime_c, ScanningTimeoutTimerCallback, NULL); isScanTimeout = FALSE; TMR_StartLowPowerTimer(mAppTimerId, gTmrLowPowerIntervalMillisTimer_c, 100, ScanningTimeoutTimerCallback, &isScanTimeout); #if (cPWR_UsePowerDownMode) Led1On(); #else LED_StopFlashingAllLeds(); Led1Flashing(); #endif } /* Node is not scanning */ else { TMR_StopTimer(mAppTimerId); #if Debug_Support SEGGER_RTT_printf(0, "\r\nStopped scanning!\r\n"); #endif if (mFoundDeviceToConnect) { // App_Connect(&gConnReqParams, BleApp_ConnectionCallback); } else { if (mCurrentLearingKeyNum != gInvalidKeyNumber_c && isScanTimeout == FALSE) { BleApp_KeyLearningStateMachineHandler(); } else { BleApp_Start(true); } #if (cPWR_UsePowerDownMode) Led1Off(); /* Go to sleep */ #if defined(MULTICORE_APPLICATION_CORE) && (MULTICORE_APPLICATION_CORE) #if defined(gErpcLowPowerApiServiceIncluded_c) && (gErpcLowPowerApiServiceIncluded_c) (void)PWR_ChangeBlackBoxDeepSleepMode(cPWR_DeepSleepMode); #endif #else (void)PWR_ChangeDeepSleepMode(cPWR_DeepSleepMode); #endif #else #endif } } } break; case gScanCommandFailed_c: { #if Debug_Support SEGGER_RTT_printf(0, "\r\nScan command failed! Reason = 0x%X \r\n", pScanningEvent->eventData.failReason); #endif } break; default: { ; /* No action required */ } break; } } static void ScanningTimeoutTimerCallback(void* pParam) { static uint32_t cnt = 0; static uint32_t oldFoundDevicesCount = 0; bool_t *pTimeOut = (bool_t*)pParam; cnt++; *pTimeOut = TRUE; // if (oldFoundDevicesCount != mFoundDevicesCount) // { // oldFoundDevicesCount = mFoundDevicesCount; // } #if Debug_Support SEGGER_RTT_printf(0, "\r\nDeviceScanned... %d, %d ms\r\n", mFoundDevicesCount, cnt * 100); #endif /* Stop scanning */ if (mScanningOn) { Gap_StopScanning(); } }

but after a while no new devices are scanned, resulting in no connection.

00> DeviceScanned... 16363, 125600 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16373, 125700 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16384, 125800 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16384, 125900 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16384, 126000 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16384, 126100 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16384, 126200 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16384, 126300 ms 00> 00> Stopped scanning! 00> 00> Scanning... 00> 00> DeviceScanned... 16384, 126400 ms

Hope to get your help.

Re: KW36 central device can not scan the device problem

Ricardo_Zamora — Tue, 19 Apr 2022 20:47:54 GMT

Hello,

What SDK example are you taking as a base? What other modifications did you made?

What is the porpoise of restarting the scanning continually? Are you connecting to a peripheral?

Regards,

Ricardo

Re: KW36 central device can not scan the device problem

jictannu — Wed, 20 Apr 2022 02:16:10 GMT

Hi, Ricardo

I've tested this on w_uart and it happens too. Because the normal logic of my code is scan -> connect & stop scanning -> disconnect -> scan, and after using it multiple times I found that I couldn't scan any devices, so I used this to test if the scan would be abnormal after multiple restarts

Re: KW36 central device can not scan the device problem

jictannu — Wed, 20 Apr 2022 06:34:03 GMT

Hi, Ricardo

This is my test project, using evk test, I can see the timer printing after pressing the button to start the scan. This number is mFoundDevicesCount, each time gDeviceScanned_c adds one, after the program runs for a while mFoundDevicesCount remains the same, proving that there is no gDeviceScanned_c anymore.

topic Re: KW36 central device can not scan the device problem in Wireless MCU

KW36 central device can not scan the device problem

Re: KW36 central device can not scan the device problem

Re: KW36 central device can not scan the device problem

Re: KW36 central device can not scan the device problem