JLink Voltage value for flasdhing change

[simon1516]

Hi,

I have a custom board with nrf52833 I would like to flash with custom firmware. I would like to flash this board by "P19 debug out connector" from DK.

How can I do the power supply of the external board? VDD of external Board has to be 1,8V!

In my opinion I have two options:

1.: Power by soldering bridge SB47 of DK. In this case, I have to customize VDD of DK to 1,8V I think. How can I do this?

2.: Power the custom board by external supply to VDDH (5V) and NOT soldering bridge SB47 of DK. Does this works? What value is VDD in this case? It´s not configured to this time.

Thanks in advance

Simon

[awneil]

simon1516 said:

"P19 debug out connector" from DK

That does not support a 1.8V target.

You will need a real J-Link for that.

(or other 1.8V-capable programmer)

[simon1516]

hmm...my information was, that programming voltage can be adjust by changing VDD, which is configurable. So if VDD of DK = 1,8V, the board is able to flash with these 1,8V. Isn´t that right?

Which alternate programmer can you recommend?

[awneil]

Ah, sorry - you didn't say which DK you were using.

The nRF52832 DK doesn't support 1.8V targets, but it seems the nRF52840 DK does:

infocenter.nordicsemi.com/.../hw_debug_out.html

[simon1516]

Yes, I use nRF52833 DK, this also support 1.8V targets:

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf52833_dk%2FUG%2Fnrf52833_DK%2Fhw_debug_out.html

But I need help for configurate this in the firmware. Can you help me with that?

[awneil]

Sorry, I've not tried that.

[haakonsh]

Since the default voltage of REG0 is 1.8V you just need to power the target device through VDDH or supply 1.8V directly to the VDD net. 

[simon1516]

haakonsh said:

Since the default voltage of REG0 is 1.8V

That is my problem. VDD Voltage of a 3rd party board is configured to 3V. So I can´t supply this board on my custom PCB (which includes this 3rd party board), because there are components working with 1,8V, powered by VDD. So I have to change VDD configuration before I can connect lipo battery to VDDH.

Therefore I have to change VDD from nrf52833 DK board to 1,8V. After doing this, I can flash firmware with this voltage level to the PCB.

Because of that, I need to know, how to change VDD voltage level of 52833 DK board.

Could you help me with that?

[haakonsh]

Call 'nrfjprog -f nrf52 -e' in cmd. This will erase the UICR register REGOUT0 that contains the settings for REG0. 

Since you need to use a debugger for that you need to power the external board through the VDD net at 1.8V. 

[simon1516]

haakonsh said:

Call 'nrfjprog -f nrf52 -e' in cmd. This will erase the UICR register REGOUT0 that contains the settings for REG0. 

I did that (s. Screenshot cmd, I think it was successful because confirmation message) but I can measure about 2.95V level of VDD Pin from nrf52833 DK furthermore.

Is there something else I have to do? Thanks for your help! I already repowered the DK by USB.

[haakonsh]

Did you erase the target on your custom board or on the DK?

[simon1516]

There was no target connected to dk board, so I erase the dk board

[simon1516]

I had another brand new 52833 DK board here, the first connect to USB power and execute "nrfjprog -f nrf52 -e" doesn´t work for changing VDD voltage. Can I try something other?