Pico/RP2040 Watchdog functions undefined reference

PlatformIO Core
1

Hi,

I’m unsure if this is a PIO or embed Arduino Core problem but I can not use the Watchdog functions from the Pico-SDK.
if I follow the Watchdog Example I get the error that watchdog_caused_reboot(), watchdog_enable, and watchdog_update are not defined.

I’m trying to understand for a while now to understand the source code structure of the mbed Arduino core but it’s quite confusing. most of the Arduino code is not in the mbed arduino core and I can not find most of the c files in the .platformio\packages\framework-arduino-mbed directory.

Could somebody help me understand how the include/source code structure is?

I can use many of the Pico-SDK functions like multicore_launch_core1 but not all. is this intended?

EDIT:

I found a solution to the watchdog include here

extern "C" {
#include <hardware/watchdog.h>
};

I still am interested in the source code structure. would like to look into some source code files

2

Hm, the extern "C" shouldn’t be necessary because the latest SDK has the correct macros in place to place them there in C++ mode.

The ArduinoCore-mbed which PlatformIO is using might however lag behind in SDK updates. When you follow the hardware/watchdog.h file in the IDE (Ctrl+Click on header name), what is the content?

3

i have the 1.3.0 Version of the PIO core installed. i think that’s the latest one.

About the Watchdog.h the IDE does not find a .c or .cpp file with a definition. i only find .h files.
Go to definition etc does not work.
I searched for the definitions by hand but couldn’t locate them eather

4

The .c files are not there because they’re hidden inside the precompiled library file (libmbed.a). Only the header is important. Ctrl+Clicking on the watchdog part of the #include <hardware/watchdog.h> line should get you there.

5

Ah okay thats what i was missing.
Thanks for the info!