How to download firmware nrf52832 to the other nrf52832?

[ENENER]

Hi.

I am going to make my own PCB with nrf52832.

Before making it, I have to check debugging through P20 in nrf52832 DK.

I have two nrf52832 DKs with SDK17.0.0.

I will call first nrf52832  No1, and the other No2 for understanding.

So, I connected No1's GND, SWDCLK, SWDIO and VDD to No2's same part.(I connected No1's P20 to No2's P20)

Also, I connect USB to No1. And, I connected external VDD to No2.

Then, I run nRF Connect's Programmer to download firmware to NO2.

But, there are only No1. I want to check No2.

How to I download firmware to No2 through No1?

I attached picture for your understanding.

Thanks

[Jørgen Holmefjord]

Hi,

In order for the debugger on DK No1 to detect that an external board is connected, you need to connect VDD from the external board to VTG pin. If the debug chip detects voltage on this pin, the external board will be programmed, else the on-board nRF52 chip on DK No1 will be programmed.

If DK No2 is powered externally, there is no need to connect VDD_NRF together.

When programming from the nRF Connect application (or nrfjprog), you will only see the debugger on DK No1, it is not possible to select from the application which nRF52 chip should be programmed, this is decided solely from the state of the VTG pin.

Best regards,
Jørgen

[ENENER]

Thanks.

I applied No2 to USB Power by Auxiliary battery.

I connected VDD, SWDIO, SWCLK and GND on No2.

And, VTG, SWDIO, SWCLK and GND on No1.

But, the nRF Connect still only see No1.

Do you know what's problem? Do I have to use other application than nRF Connect?

[Jørgen Holmefjord]

What exactly do you mean by "But, the nRF Connect still only see No1"? As I mention, nRF Connect will only show the COM port and serial number of the Interface MCU/J-Link debugger chip. You select the serial number of DK No1 in nRF Connect and it will program No1 or No2 based on if VTG is connected to VDD of the external board or not. Have you tested this? Are you not able to program the external board?

As a test, you can flash a blinky application to the No1 DK, then perform an erase operation from nRF Connect programmer after connecting VTG. If DK No1 still blinks, the programmer have programmed No2.

[ENENER]

I have tested this a few minutes ago. But it still works wrong.

I am able to program not No2 but No1.

I got error message like this "Could not fetch memory size of target devkit: Error: Error occured when get library info. Errorcode: CouldNotOpenDevice (0x4) Lowlevel error: JLINKARM_DLL_ERROR (ffffff9a)" in nRF Connect.

How can I solve this?

[Jørgen Holmefjord]

Normally, this kind of error comes from the external board not being powered correctly, or some issues with the connections. What is the voltage level of VTG, and what is the input voltage of DK No2? It is powered through the J2 USB port?

[ENENER]

It is powered through the J2 USB port?

 - yes, But It was not successful.

So I tried applying 3.3 DC Voltage to VDD on No2 DK. Also the voltage level of VTG on No1 was 3.3v same.

However it was not successful too.