How to reset NRF52 after readback protection?

RE: How to reset NRF52 after readback protection?

Richard D. — Tue, 27 Mar 2018 17:22:47 GMT

That was it, I was missing the --pinresetenable. Thank you very much!

RE: How to reset NRF52 after readback protection?

Jeff4BLE — Tue, 27 Mar 2018 17:01:52 GMT

Have you tried

Test 1:
nrfjprog --chiperase --verify --program myfile.hex

nrfjprog --pinresetenable
nrfjprog --debugreset

Test 2:
nrfjprog --chiperase --verify --program myfile.hex

nrfjprog --pinresetenable
nrfjprog --pinreset

See nrfjprog commands for details.

RE: How to reset NRF52 after readback protection?

Richard D. — Tue, 27 Mar 2018 16:22:08 GMT

Removing some variables by using PCA10040a instead of my custom board and leaving aside the issue of readback protection.

Test 1:
nrfjprog --chiperase --verify --program myfile.hex
nrfjprog --debugreset
result: my application is not running

Test 2:
nrfjprog --chiperase --verify --program myfile.hex
nrfjprog --pinreset
result: my application is not running

Test 3:
nrfjprog --chiperase --verify --program myfile.hex
nrfjprog --reset
result: my application is running

This suggests that --pinreset nor --debugreset are doing nothing or at least doing something different from --reset. Nrfjprog documentation says for all 3 commands that "The core will run after the operation". I'm not seeing this to be true. Is anyone out there using --pinreset or --debugreset successfully?

RE: How to reset NRF52 after readback protection?

Jeff4BLE — Mon, 26 Mar 2018 23:29:46 GMT

Was pinreset enabled before read-back protection was set?

For nRF52 devices, only --pinreset or --recover operations are available after --rbp.

See nrfjprog commands for additional details.

Cheers