How do you program the nRF52 DK using P19 to connect to an external board?

[duendiad]

I am currently working with the nRF52 DK and have compiled some code to read ADC values. This code works fine with the nRF52 DK but I am having trouble getting it to work through P19. I currently have a 10-pin header connected to an external board with BC832 but had some questions.

How am I supposed to program this external board through P19? As I said I have code working for the DK but how is this supposed to transfer to the external board? Pin 19 is connected to the BC832 but there doesn't seem to be a connection or any readings.

Any advice helps.

Thank You

[Kenneth]

Hi,

I can't find a pin description for P19 on the nRF52DK user guide, so I am linking to the nRF52833DK documentation for P19 (which should be the same in this case):
https://infocenter.nordicsemi.com/topic/ug_nrf52833_dk/UG/dk/ext_programming_support.html 

Make sure the external board is powered with 3V, and that this 3V is also connected to the EXT_VTG pin of the P19 header. (FYI: You don't need to connect EXT_SWO and EXT_RESET, but EXT_VTG , EXT_SWDIO, EXT_SWDCLK, GND and EXT_GND_DETECT should be connected.)

Best regards,
Kenneth

[duendiad]

So I have the board powered up correctly and the connector is placed correctly as well but I am still getting no connection with the BC832. The code that works on the DK is able to read and display the ADC but the BC832 still isn't able to do anything. My goal right now is to get the BC832 to obtain these ADC values. What do I need to do?

Thank You

[Kenneth]

My suggestion is to connect the debugger and see where it is "hanging" and/or if there are any error codes.

Kenneth

[duendiad]

Thank you for your response.

After running the code I didn't find any errors but I also didn't find any legit signal being sent from P19.

The code I have reads the ADC values from AIN3 and this is because I sent a generated signal to this pin to make sure the code was running correctly. I want to be able to program the BC832 module from the nRF52 DK and allow it to read ADC values like the DK is doing currently. How would I have to modify this code to let the BC832 know what it is supposed to do through SWDIO and SWCLK? The signal being sent from the connector I believe is standard as it is a sinusoidal wave with a frequency that is the same for every pin at 60Hz and the voltage isn't anything significant.

Are there certain commands to program SWDIO and SWCLK? How is the BC832 supposed to know what it's supposed to do through P19?

The voltage I have set for the external board is able to power every module correctly. I currently have 3.3 Volts going through this external board which I have heard should work just fine.