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earlephilhower / arduino-pico

Raspberry Pi Pico Arduino core, for all RP2040 and RP2350 boards
GNU Lesser General Public License v2.1
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Can watchdog just reboot one processor (e.g. core1) leaving core 0 running #2668

Closed Gavin-Perry closed 7 hours ago

Gavin-Perry commented 8 hours ago

For whatever reason I can't track down, it seems that my core 1 process is quitting/crashing. So I tried adding a watchdog called for it like this:

void setup1() { // init some vars Serial.printf( "Reset %s", rp2040.getResetReason()); rp2040.wdt_begin(16000); // Restart at 8 sec (double decrement issue still there? }

And then periodically do rp2040.wdt_reset(); in loop1

I was hoping to get a reason when it restarted, but I guess I don't have it reporting correctly, nothing prints. And the USB resets (PC beeps on reconnect)

RP2040::resetReason_t rp2040.getResetReason() Returns the reason for the last reset, defined in enum RP2040::resetReason_t. See example ResetReason for some details.

red " enum RP2040::resetReason_t. " and ResetReason aren't links; where do I find examples?

Also it halts both cores. Core 0 is still working (along with USB stuff) so I'd rather leave it alone Should I just write my own WD and use rp2040.restartCore1(); to do the restart? Probably answered my own question but I thought I'd put it out there in case there's a way to do it in SDK that I can't find.

earlephilhower commented 7 hours ago

Sorry but no, the watchdog isn't built that way. More info is in the datasheet.

You also can't really just reset one core and keep things consistent. This is a shared memory multiprocessor system and things like initializing .data and .bss are done only once at power up (i.e. static and global variables). So even if you somehow got core1 to stop and reset to a known address/state, the global memory would not reset.

Gavin-Perry commented 7 hours ago

Global memory not resetting is fine. Mostly I don't want to lose var values. I'll deal with what needs to re-initialize in the setup1 when it restarts. Thanks for your help.