Custom board nrf52832 crashed

[Andrei]

Hello!) Have some problem with custom pcb, created for nrf52832. After mounting all components a connected pcb to nrf52dk through P20 port. Chip was correctly detected in nrfgo. Then I did one MISTAKE) I tried to load .BIN file to chip with Bootloader tab) Not .HEX file... After I pressed confirm it was some error, and now I only see in nrfgo that "chip is not detected or locked", removed can't help: "Unknown error". The internal chip detected correctly if I disable vcc from external pcb......Maybe I can solve with problem without unmounting old CHIP and mounting new ....

[Roger Clark]

Sounds like you locked the chip.

The same thing happens with JFlash if you fill the entire chip with zero's, as it overwrites the memory mapped hardware registers with 0x00 which locks the chip.

If you are using JLink, you could try using JFlash to do a Erase Chip, as I know on the nRF51 that clears the whole chip and removes the lock. But I have not tested the same procedure on the nRF52.

[Andrei]

When I launch Flash, I try to connect or to erase all command,but program says "Could't connect to target", when I Use JLink commander, I write "connect", then select chip type, then speed and after program says "Can't read hardware type".Somethink like this. I can't send to you image, because I found ONE EXTRA PROBLEM))) Someone, who was soldering my SUPERBOARD) made mistake with positioning 32 MHz chrystal, the pad with GND was soldering to OUT/IN....So I think these problems are independent, but today I gave them this board to solve mistakes.....