RE: Device fails to advertise and has become non-responsive

kumar narendra singh — Mon, 17 Dec 2018 16:57:53 GMT

Hi Kenneth,

Thanks for your reply. i will check your recommendations. I have some updates about my device.

Initially 4 of the boards got problem and evenif i do erase all and loaded softdevice and application, device was not able to advertise as beacon or gpio toggling. Later i used nrfgostudio and loaded bootloader,softdevice and then application and all 3 non working boards started working i.e led started toggling and beacon works. But after i power reset, it stops working. This i have tested multiple times and everytime i program it works but not after reset. One of the board does work after power reset also. so 2 out of 3 boards have problem after reset i.e. led doesn't toggle and beacon doesn't work.

For test, i have tested led blinky application on all 3 boards and it blinks without problem even after reset.

Can you please tell me what could be reason for this behavior? The same piece of code works fine on development kit. I have attached schematic for your reference. 32.khz crystal and capacitors are placed on board.

RE: Device fails to advertise and has become non-responsive

Kenneth — Mon, 17 Dec 2018 12:17:37 GMT

Hi,

You can use any speed, there will be no damage. Some things to check:

- If you have enabled debugging (e.g. uart), make sure the RXD line is pulled high externally if no serial port is attached.

- Make sure you have the correct lfclk setting, for instance if your board does not have external 32kHz crystal, then you must use internal lfclk.

- Check if you may have (for instance by accident) enabled pin reset (CONFIG_GPIO_AS_PINRESET) or nfc pins (CONFIG_NFCT_PINS_AS_GPIOS) in your code (see system_nrf52.c), because then you will need to handle these pins correctly. For instance you may need to pull the reset pin high (to vdd) externally.

- Try 'nrfjprog --eraseall' to make sure UICR is erased before programming.

- Make sure you are programming correctly softdevice for the chip and sdk version.

Best regards,
Kenneth