Sketch compiles, flashes, and then...nothing

[JoshuaACNewman]

I realized that I had the mbed Arduino core installed, rather than earlephilhower, which was why Wire1 wasn't working for me. So I explicitly switched. That eliminated those mysterious error codes (Phew!). The code compiled and flashed, and then...

...

nothing.

So I backed up and wrote up a quickie Blink just to make sure that normal stuff was working. Still nothing.

No errors, everything compiles, console tells me that the code is downloaded. But the board seems to be just inert.

Any ideas?

Code (at its most basic):

void setup(){}

void loop(){
  digitalWrite(25, HIGH);
  delay(500);
  digitalWrite(25, LOW);
  delay(500);
}

Console output:

Sketch uses 59432 bytes (2%) of program storage space. Maximum is 2093056 bytes.
Global variables use 9492 bytes (3%) of dynamic memory, leaving 252652 bytes for local variables. Maximum is 262144 bytes.
"/Users/joshuanewman/Library/Arduino15/packages/rp2040/tools/pqt-python3/1.0.1-base-3a57aed-1/python3" -I "/Users/joshuanewman/Library/Arduino15/packages/rp2040/hardware/rp2040/4.4.4/tools/uf2conv.py" --serial "/dev/cu.usbmodem1412201" --family RP2040 --deploy "/Users/joshuanewman/Library/Caches/arduino/sketches/FFAAFFBCE2C2B55AEA2F5B48C2EF6EFC/Raspblink.ino.uf2"
Resetting /dev/cu.usbmodem1412201
Converting to uf2, output size: 152064, start address: 0x2000
Scanning for RP2040 devices
Flashing /Volumes/RPI-RP2 (RPI-RP2)
Wrote 152064 bytes to /Volumes/RPI-RP2/NEW.UF2

I can't think of any permissions that would apply to this since it seems to be genuinely writing to the board.

Obviously, I don't just want to run Blink. But even this isn't running.

[earlephilhower]

Try setting pinMode(25, OUTPUT) in setup or the GPIO will remain an input and you're not going to see anything. Also pin 25 is only for certain boards, try LED_BUILTIN for compatibility (i.e. Pico vs PicoW)

[JoshuaACNewman]

Holy crap. That did it. Is this frustration just because I didn't manually set pins?

Update: Works on my regular code, too!

Also, it seems that it's a different USB device now, using device 5 instead of 3 ¯\_(ツ)_/¯