super basic question about using the RP2040 helper class

[rgsparber]

I need to know which core is running my code and found the rp2040.cpuid() function. The Arduino IDE compiler says

FlightDataRecorder4.0.0:510:1: error: 'cpuid' was not declared in this scope
510 | cpuid();
| ^~~~~
FlightDataRecorder4.0.0.ino: At global scope:
FlightDataRecorder4.0.0:513:12: error: expected initializer before '.' token
513 | void rp2040.cpuid();
|

What am I doing wrong?

Thanks,
Rick

[earlephilhower]

rp2040.cpuid(), not cpuid()

[rgsparber]

After loop() ends, I have

void rp2040.cpuid();

Should I be #including something?

Rick

[earlephilhower]

You're defining a function, not calling one, with that line.

There is nothing to include other than the usual #include <Arduino.h> which defines the rp2040 object and then just call rp2040.cpuid(). ex: Serial.printf("cpu: %d\n", rp2040.cpuid());

[rgsparber]

Thanks for your help! It works now.

My confusion was that the docs at https://arduino-pico.readthedocs.io/en/latest/rp2040.html say, under RP2040 helper class:

int rp2040.cpuid()

so I assumed this is what I had to put in my file.

I had #include "Arduino.h" rather than #include <Arduino.h> which was my other problem.

The ability to identify which core is running my code removes a major headache for me as I try to debug my code. I had a bug that ran the same code on both cores at the same time and the only indication of a problem was that the prints were sometimes jumbled together. Other times it was fine. Gotta love Murphy.

Thanks again,

Rick