Program Not starting in my Nrf52832

[hkarthik97]

Hi ,

I have my own custom nrf52832 pcb. I have 2 chips on my pcb.

I program my device with Nrf52 Dk.

When I program MCU 1. The program is uploaded successfully and i am able to discover my device on NRF Connect App.

When I program MCU 2. The program is uploaded successfully(I am uploading the same program that has been uploaded to MCU 1 FOR TESTING PURPOSE ) and i am not able to discover the device.

I am uploading my Schematics with this Ticket and i am also sharing my firmware stack captured on NRF connect programmer.

Schematics.pdf

[hkarthik97]

You are able to successfully talk to both devices, program and erase both nRF52832 SoC's?

Ans : Yes I am able to talk to both and erase both.

You are using a J4 and J5 to successfully program. Do you power of one of the SoC when the other is used?

Ans: Both of them are powered when the program is uploaded.

[JONATHAN LL]

So presumably you have successfully programmed both devices, U14 and U15. Now only one is preforming as expected by being detectable of BLE. C

Can you make sure that both radios are not transmitting att he same time?


I dont know how close the two devices are located in the PCB, but having two radios in close proximity that operates in the spectrum could cause one or both of the radios to not preform as expected. 

From the schematic i can not se anything that would point to that one of the devices would work and the other will not. Schematic looks ok. Only concern is that both radios are not properly isolated form each other. 


I also suggest that you enable logging over RTT or UART and debug the device that you are not detecting, see what is happening. 

Lokks like you have the same 32MHz for both devices, could you make sure that it is loaded correctly. 

Difficult to say exactly what is the issue, i am guessing that it is due to both radios being on at the same time or tone of the 32MHz crystals is a bitt off maybe.

Try to debug both devices and see if they behave the same. If they do then only use the radio on one device at the time.

I can look at the HW files to see if there is anything that gives a clue to why MCU2 does not behave as expected. 

Regards,
Jonathan