Timing+counting while using BLE

RE: Timing+counting while using BLE

Erik Hougaard — Wed, 23 Feb 2022 10:07:40 GMT

Hi Einar,

Thanks for the advice on best practise. I have implemented a separate thread like you suggested, and that has solved the issue - as well as the potential issue of the ISR waiting for the BLE device.

Best regards,

Erik

RE: Timing+counting while using BLE

Einarh — Mon, 21 Feb 2022 09:57:00 GMT

Hi Erik,

If you're able to do advertising in main but not in your interrupt, then I can see a couple possible causes.

First I would check if the variables you are putting into bt_le_adv_start are defined in your event-handler. A crash like this can happen if your program is trying to access a pointer that is defined with a scope that does not include the function it is called from.

I would also consider whether it is actually a good idea to call bt_le_adv_start from an interrupt. If this function is waiting for the BLE device to become available then calling it from an interrupt wouldn't be optimal. If this is the case I would consider making a BLE controller thread that controls the advertising, and use a semaphore to signal to it from your event-handler.

-Einar

RE: Timing+counting while using BLE

Erik Hougaard — Mon, 21 Feb 2022 08:45:44 GMT

Hi Einar,

I can succesfully start and stop advertising from main(), even with timers and PPI initialized. But as soon as I try starting it from inside the event-handler of the timer, it crashes.

So my thought is that the BLE system is properly initialized and that prj.conf is OK, but that I'm doing something else wrong. This is my proj.conf for reference:

CONFIG_ADC=y
CONFIG_ADC_ASYNC=y

CONFIG_NRFX_GPIOTE=y

CONFIG_SENSOR=y

CONFIG_NRFX_TIMER=y
CONFIG_NRFX_TIMER0=y
CONFIG_NRFX_TIMER1=y
CONFIG_NRFX_TIMER2=y
CONFIG_NRFX_PPI=y

CONFIG_BT=y
CONFIG_BT_BROADCASTER=y
CONFIG_BT_OBSERVER=y
CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_LL_SW_SPLIT=y

CONFIG_HEAP_MEM_POOL_SIZE=256
CONFIG_ASSERT=n

# Clock Configs
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_NRF=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=n
CONFIG_NRF_RTC_TIMER=y


##### PRINTING | LOGGING #####
# Print configs

CONFIG_LOG=y
CONFIG_CONSOLE=y
CONFIG_SERIAL=n
CONFIG_LOG_MODE_DEFERRED=y
CONFIG_PRINTK=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_UART_CONSOLE=n

# Power
CONFIG_SYS_POWER_MANAGEMENT=y
CONFIG_DEVICE_POWER_MANAGEMENT=y
CONFIG_BOARD_ENABLE_DCDC=y

Erik

RE: Timing+counting while using BLE

Einarh — Thu, 17 Feb 2022 14:53:56 GMT

Ah I see.

With this type of crash I would then suspect that you either haven't inited ble properly, maybe an interrupt/callback isn't set up, or possibly something is missing in your prj.conf file.

-Einar

RE: Timing+counting while using BLE

Erik Hougaard — Thu, 17 Feb 2022 11:38:41 GMT

Hi Einar,

I don't get any errors or warnings during compile. "ad" is defined in line 45 of the sourcecode, and BT_LE_ADV_NCONN is defined in bluetooth.h

Best regards,

Erik

RE: Timing+counting while using BLE

Einarh — Tue, 15 Feb 2022 13:58:38 GMT

Hello!

Looking through your code while looking at your debug prints, it seems like your code crashes when it calls bt_le_adv_start(BT_LE_ADV_NCONN, ad, ARRAY_SIZE(ad), NULL, 0);

However I can not seem to find "BT_LE_ADV_NCONN" or "ad" defined in your code.

Am I mistaken or have you forgotten to define them?

Do you get warnings about this when compiling?

Best regards,

Einar