NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

Nguyen Hoan Hoang — Sat, 04 Jun 2016 02:17:22 GMT

@RK, Yes, I did saw your answers. They are very elaborated. perhaps he didn't read through. I just tried resume it short and sweet :)

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

RK — Sat, 04 Jun 2016 02:05:13 GMT

Yes this is what I've told him twice now ..

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

Nguyen Hoan Hoang — Sat, 04 Jun 2016 01:39:16 GMT

Old rev can still runs with SDK8, not an issue. The problem your are having it that your linker script is for the 32KB RAM while you new chip only have 16KB RAM. Therefore your stack pointer is in no man's land. Your code will never get past the reset vector.

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

RK — Thu, 02 Jun 2016 10:04:27 GMT

Just to be clear the SDK/Softdevice incompatibility, whilst an issue, most likely isn't the reason it's not running. As I said in my original reply, you've linked for a CFAC chip which had 32kB RAM and the stack pointer has been put at the top of that region. You've then used the same binary on a CEAA which only has 16kB of RAM so the stack pointer is pointing to invalid memory, which reads as zero, so on the first return from a routine you end up in the middle of nowhere.

If you linked your code for 16kB, if it that's even enough memory, it would probably at least run, after a fashion. It wouldn't be production worthy, I wouldn't recommend it, but it would probably run.

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

MartinBL — Thu, 02 Jun 2016 08:36:21 GMT

Answer to edit:

Old SDK. Old S110. Regarding whether or not your SDK V8.0.0 will run on old chips please read my answer in this thread.

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

Texton — Thu, 02 Jun 2016 08:18:05 GMT

Please check edit

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

Texton — Thu, 02 Jun 2016 08:18:03 GMT

Please check edit

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

RK — Wed, 01 Jun 2016 23:43:24 GMT

Chip version on that cheap board is what? Where's the stack pointer in your code? Return to FFFFFFFE often means the SP isn't actually pointing to real memory, you've popped off 0x00000000 and tried to return to it and are dead.

The fact that GDB is trying to read from 0z20007FFC also indicates something is pointing to memory up there, memory that only the QFAC chips actually have on them. Do you have a QFAC chip, where is your stack?

RE: NRF51 fails when flashing: Target halted (PC = 0xFFFFFFFE)

Nguyen Hoan Hoang — Wed, 01 Jun 2016 22:56:11 GMT

Check loader script. Different version of SD has different address for app firmware. Look very much like you have the wrong address