nrf52811 custom board - example code

[ashokr.com]

Hi All,

I have designed my custom pcb board for nrf52811. With the Jlink the IC is detected in visual studio code also it gets programmed. But i did not see its working when i use basic bluetooth application (becon), uart etc. kindly help on this , if there is hex file which i can directly flash into my board for confirming Bluetooth operation working. This is very urgent for us to get it done before CES2025.

Thanks

Ashok R 

[Vidar Berg]

Hello Ashok,

Please have a look at this thread:  nrf connect sd which I think may be relevant to your case. Does your board include the optional 32K crystal? If not, it's important that you change the LF clock source to use the internal RC oscillator by adding this line: "CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y" to your project configuration file (prj.conf). Otherwise, the program will enter an endless loop on startup waiting for the crystal oscillator to ramp up.

Best regards,

Vidar

[ashokr.com]

Hi Vidar Berg 

Thank you! I will try these things i have installed 32K crystal as well , unfortunate now the chip is not detecting itself.

Is there way to identify chip is dead/good in condition?

i will get back to you soon.

Thanks

Ashok

[Kenneth]

ashokr.com said:

But still the code does not works, kindly help on setting up debug option with jlink for VS code.

Can you try to elaborate a bit more than "does not work". Is the code executing, does the chip seem to start, if you are not using BLE, does the code run then? Maybe go a bit back to start, and just try a hello world sample or blinky project from nRF Connect SDK as-is. If the board have worked up until a certain point, it may also be that the board have been damaged some way, do you have a second board for comparison? Do connect pin reset (P0.21) directly to VDD show any change, what did you do to recover the board?

Kenneth

[ashokr.com]

Hi Kenneth 

I have mention about the example which im using.. "Blinky", Also i mentioned the configuration of ubx_bmd360eval. board. In my custom board LED is connected to P0.18. So i had to edit dts file. but final result is led is not blinking.

[Kenneth]

You need to try to debug this a bit, for instance use the ozone debugger to find where it seems to fail/stop.

Kenneth

[ashokr.com]

Kenneth  I used ozone debugger and downloaded the elf file ,
After i start debugging LED started blinks. It stopped blinking after i end the debug session. I also did power cycle reset but the code does not starts. seems works only after i click start button on ozone debugger.  Any idea?

[ashokr.com]

HI I'm waiting for response. The code works (blink) only when debugging , normal power On it does not starts.

[Kenneth]

Hi,

I don't know. It's difficult to know exactly what the problem is. Likely something hardware related, e.g. can it be some external pins or circuitry that upon startup have wrong state that prevent the application to continue run somehow. I would suggest to put some pin toggling in the very beginning or even a delay early in main() just for external circuitry to settle if that is the problem.

Kenneth