SW device "no target connected " nRF52840

[Marcos Tadeo]

Hello

Im developping in nrf52840 , and created a pcb using nrf52840 qiaa 7x7

configuration

are we need to do something to first time?

because im trying to program but keil shows this 

i have no idea if need to charge a bootloader something like that, we are checking the circuit connections 

but we would like to konw if need to do  to the first time using nrf52840 qiaa 7x7 

thanks and regards

[Senchoi]

Are you supplying the power to the device? As debuggers don't supply power when connected, I guess it could be a similar issue.

[Marcos Tadeo]

Hello 

yes, we checked the power supply and its ok apparently , 1.8v in "VDD nrf" tag
I saw a post says the chip dont have a "bootloader " precharged, then that reason i cant to program the microcontroller , is this correct?

i was thinking, didnt need to do it

if yes , how can i do that ?

thanks and regards

[ketiljo]

There's no bootloader in the nRF52840 when it hasn't been programmed before. What programmer are you using? If it's the ST-Link, it may or may not work. Hard to say as it's not supported. 

Download this: https://www.nordicsemi.com/Products/Development-tools/nrf-command-line-tools/download

and write nrfjprog --recover

[Marcos Tadeo]

Hello 

thanks for your reply

ketiljo said:

There's no bootloader in the nRF52840 when it hasn't been programmed before.

do you mean that i can charge my code without flashing a bootloader before?, I customized a board for nrf52840 and I bought a Chip micontrollorer with Nordic distributors 

I was testing whit nrf52840 dk generic over SWDIO and  SWCLK with st link v2 debugger, no problem 

when i created a custom board the keil IDE no detected the micro , my custom board has not been  programmed before, 

im following this tutorioal:

Does nRF52840 need Bootloader for the first time?

sorry my english grammar is not good

[ketiljo]

Marcos Tadeo said:

yes, we checked the power supply and its ok apparently , 1.8v in "VDD nrf" tag

Check if the debugger supports 1.8 V. Not all does that.

You can program the device using the SWD interface without any bootloader.