Problems with Serial.print

[github-rkaiser]

Hi Uri,

I get a weird error message

> /rp2040/tools/pqt-gcc/4.0.1-8ec9d6f/bin/../lib/gcc/arm-none-eabi/14.2.0/../../../../arm-none-eabi/bin/ld: /sketch/_wokwi_mbed_speedup_patch.cpp.o: in function `_GLOBAL__sub_I__wokwi_mbed_speedup_patch.cpp':
> /sketch/_wokwi_mbed_speedup_patch.cpp:5:(.text.startup._GLOBAL__sub_I__wokwi_mbed_speedup_patch.cpp+0x4): undefined reference to `rtos_attach_idle_hook'
> collect2: error: ld returned 1 exit status
> Error during build: exit status 1/rp2040/tools/pqt-gcc/4.0.1-8ec9d6f/bin/../lib/gcc/arm-none-eabi/14.2.0/../../../../arm-none-eabi/bin/ld: /sketch/_wokwi_mbed_speedup_patch.cpp.o: in function `_GLOBAL__sub_I__wokwi_mbed_speedup_patch.cpp':
> /sketch/_wokwi_mbed_speedup_patch.cpp:5:(.text.startup._GLOBAL__sub_I__wokwi_mbed_speedup_patch.cpp+0x4): undefined reference to `rtos_attach_idle_hook'
> collect2: error: ld returned 1 exit status
> Error during build: exit status 1

when I use Serial instead of Serial1:

Serial.begin(115200); // Initialize the serial port. Without 
Serial.println("Embedded C++ (www.rkaiser.de) - serial port ready");

in my Raspberry Pi project. In the past I could workaround this by removing in diagram.json the lines in connections with

["pico:GP0","$serialMonitor:RX ...
["pico:GP1","$serialMonitor:TX ...

and since I have not seen these lines, it took me hours to find the reason.

Is there still a way to use Serial instead of Serial1?

Thanks
Richard

[urish]

Thanks for reporting!

This was caused by an old performance hack used for the Arduino Mbed core, which is no longer relevant. I removed this hack and RP2040 builds should now run correctly.