Hi, So I I'm working with nRF52833_xxAA on a custom board. I want to be able to debug without erasing all after power reset so I followed this tutorial.
And I was following the instructions:
I am using Keil to flash the code, writing 0x10001208 register, doing a system reset and everything seems fine, device still unlocked. The moment after I did power reset the device is locked again:
> nrfjprog --recover Recovering device. This operation might take 30s. Erasing user code and UICR flash areas. Writing image to disable ap protect. > nrfjprog --eraseall Erasing user available code and UICR flash areas. Applying system reset. ***Here I am flashing a code using Keil without ENABLE_APPROTECT defined*** > nrfjprog --memwr 0x10001208 --val 0x5a Parsing parameters. WARNING: Writing to a non-empty address may result in unexpected behavior. Would you like to continue with the operation? [Y]/N Y Writing. > nrfjprog --memrd 0x40000558 0x40000558: 0000005A |Z...| > nrfjprog --reset Applying system reset. Run. > nrfjprog --memrd 0x40000558 0x40000558: 0000005A |Z...| ***Here I am doing power reset for the board*** > nrfjprog --memrd 0x40000558 ERROR: The operation attempted is unavailable due to readback protection in ERROR: your device. Please use --recover to unlock the device. NOTE: For additional output, try running again with logging enabled (--log). NOTE: Any generated log error messages will be displayed.
Questions:
1. What "2. Program code compiled with an MDK 8.45.0 or later" actually means? I had a hard time figuring this out. I assume MDK 8.45.0 is nRF MDK pack as found here. First of all there is no version for Keil 5 (my Keil is 5.36.0.0), so I tried downloading Keil 4 pack but it does nothing, code compiles with or without it and my code generation tab only provides these options:
So what is exactly nRF MDK and how to use it? Is it usable with Keil 5?
2. Am I doing something wrong so my device is locking after power reset?
