NRF52832 Crashing after sending Notification

RE: NRF52832 Crashing after sending Notification

patjshan — Mon, 18 May 2020 16:54:31 GMT

I Have found the issue, I simply set up the attribute incorrectly in the characteristic add function and pu t the wrong value in the macro was using to set max_len.

I will close this ticket

RE: NRF52832 Crashing after sending Notification

patjshan — Mon, 18 May 2020 15:37:26 GMT

I have made some more headway on the possible problem. After setting some breakpoints I can see that the sd_ble_gatts_hx() function is returning err_code 0x0C indicating that my data size transmission however I am only transmitting 16 bytes, well within the 20 byte MTU size when accounting for the opcode and handle length. Any ideas?

RE: NRF52832 Crashing after sending Notification

patjshan — Mon, 18 May 2020 15:00:22 GMT

I tried to generate a 16 byte random vector, and used a function that contained the sd_rand functions that would check the number of available bytes and write them to the buffer as they came in in a do, while loop. but the number of available bytes was always zero.

I put in a separate devzone ticket for that problem, and made this one after i switched to using the nrf_drv_rng functions directly (link to rng ticket https://devzone.nordicsemi.com/f/nordic-q-a/61445/softdevice-rng-functions-not-working)

I have been doing some experimenting with this problem more (crashing after notify) and it seems that if i use an indication the program will not crash however i have two indications that i am trying to send one after the other and only one of them gets sent (I assume because the sd is waiting for the response from the central)

RE: NRF52832 Crashing after sending Notification

Edvin — Mon, 18 May 2020 13:03:59 GMT

Hello Patrick,

[quote user=""]It might also be worth mentioning that I am using the RNG peripheral on the chip and I' not using the recommended sd_rand functions to access the values because they were not generating any values for me. I'm not sure if this would affect the softdevice in the aforementioned way.[/quote]

It is not unlikely that this is what's causing the problems. How did you try to use the softdevice implementation for the random number generations, and what was it that didn't work?